The advantages of large-scale high-temperature car furnace and framework

Large-scale high-temperature car furnace advantages:
· Large-scale high-temperature car furnace using barbed blanket and ultra-lightweight refractory bricks of quality long fiber composite energy-saving structure, the advantages of solid and durable, excellent corrosion resistance, excellent thermal stability and thermal shock resistance, thermal insulation.
2 trolley impact-proof bricks, automatically seal pallet and furnace door rails, foundation installation is not on level ground can be used.
3 · heating element with high temperature resistance alloy wound into a ribbon or spiral, were installed in the furnace side door, the back wall and put silk brick trolley to ensure that the furnace temperature uniformity and stability.
4 microcomputer program control and record temperature curve, high precision temperature control. Automatically in accordance with the process requirements heating, insulation, power-off function. Recording instruments have recorded over-temperature alarm, burnout alarm and other functions.
Large-scale high-temperature the trolley stove car framework:
Large-scale high-temperature trolley stove car frame with steel welding, forming, steel to ensure no deformation at full load. Within the refractory brick masonry, collision-prone parts of the load-bearing parts are built with a heavy brick, reinforced lining structural strength, The Trolley walking self-structure, driven by the reducer sprocket to go round on the tracks. Trolley sealed with double seal automatically labyrinth structure and soft touch, trolley into the furnace through the cam and roller slope sealed automatically rise. Trolley out of the seal groove automatically fall the seal groove seal of sand to fill after having to constantly added. Trolley out of the door lifting are electric control, with electromagnetic brake to prevent inertial impaction furnace, and the chain of control, that is slightly open the door, automatically cut off the heating element, while restoring power to the trolley running gear. Door closed in place, automatically cut off the power to the trolley running gear, while restoring the power of the heating element.
In order to shorten the cooling process time, large-scale high-temperature car furnace roof has speed up the cooling exhaust. Off when the device is heated, cooled to a certain temperature to open and close the open operation at the side of the furnace through a manual mechanism or automatic control by the operator to complete.

Muffle furnace maintenance should note:

1, when the first use of a muffle furnace again after disabling or long-term use, the oven must be carried out. The oven temperature 200 ℃ time should be four hours. 200 ℃ to 600 ℃ four hours. When used, the furnace temperature shall not exceed the maximum rated temperature, to avoid burning heating element. Prohibit the furnace infusion of liquid and soluble in a variety of metals, Burnout oven below the maximum temperature of preferably below 50 ℃ work, then furnace wire has a longer life.
2, muffle furnace and the controller must not exceed 85% relative humidity, no conductive dust, explosive or corrosive gases in the workplace. Where the grease is attached to a metal material being heated, the volatile gas will affect a large number of heating element surface and etching, so that destruction and shortened life span. Therefore, the heating should be timely prevention and well sealed containers or suitable openings to be eliminated.
3, muffle electric furnace controller should be limited to the ambient temperature 0-40 ℃ range.
4, according to the technical requirements, regular and frequent checks furnace, the controller of the wiring connection is good, whether the indicator pointer moves stuck stranded phenomenon, and because electricity meter calibration potentiometer magnets, demagnetization, up wire, shrapnel fatigue, balance error increases damage caused by the situation.
5, thermocouples do not suddenly pull out at high temperatures to prevent the jacket burst.
6, and keep the furnace clean, timely removal of the furnace oxide and the like things.

The chamber furnace product description and safety technical regulations

Used for heating before forging the metal billet or ingot. Heating the material does not move; non-segmented furnace temperature uniformity throughout the for large ingot heating periodic temperature regime (ie the oven time is divided into warm-up period, the heating of the soaking period). There are two types: fixed hearth chamber furnaces and car bottom furnace chamber furnace.
Technical specification for safety:
1, safe, all furnace must have the following components and safety facilities. The outlet temperature of the automatic adjusting means; the feedstock oil automatic control means; furnace, convection, furnace tubes, radiation, temperature indication of the flue;
Population and superheated steam pressure gauge furnace; damper and flue baffle; emergency venting devices; blast doors; hearth and back elbow tank fire steam line.
3. The new furnace according to prescribed procedures must be put into use, the heating curve Ovens.
4. Hearth chamber furnace ignition off good hole, the flue baffle opening to 1/3 1/2, fuel oil systems circulation and circulation of raw materials, ready to soak diesel ignition stick.
5. Ignition steam furnace residue gas rush the net, on the upper end of the burner will ignite ignition rods, others to leave the bottom of the furnace, steam slightly open, and then open the oil line. Point fuel fire, regulate oil and gas than to a normal state.
6. Cited gas off the net water storage and condensed oil and drained in a safe place for more than 15 minutes, the laboratory analysis of the oxygen content of less than 1%, before the vote with the ignition. Gas into the blast furnace must pass the flame arrester.
7. Ignition fireman can not face the fire mouth and see the fire window to avoid tempering wounding. If the flame goes out, the fuel valve should be closed immediately, the furnace domestic demand steam purge in order to re-ignition.
8. Normal operation should always check the stove burning at any time to adjust, pay attention to check whether the tube bending, bubbling, peeling, redness and dark abnormal situation, pay attention to check back elbow, plug, entrances valve flange seamless oil phenomenon, abnormal, and immediately reported to the leadership, to take measures to deal with.
Case of burn-through caused by a ruptured tube furnace of fire or an emergency need into the furnace, the application of steam to put out the fire cooling treatment, no water is injected into the furnace for fire fighting and cooling.
10 into the furnace overhaul should handle into the equipment and operating procedures. Explosion-proof doors shall not be blocked with other objects, so as not to lose the explosion-proof effect.
11. Furnace heating or shutdown cooling must be strictly in accordance with the provisions of the heating and cooling rate.
12 emergency shutdown, against only wind instrument used to close the control valve, be sure to close the blast furnace hand valve.
(13) In case of the heating medium interrupts should immediately fire the furnace pass into the steam.

What are the advantages and EAF what are the disadvantages

1) Compared with fuel stove is easy to get high.
2) can be heated to an internal temperature from the material.
3) facilitate the controlled atmosphere furnace and the vacuum furnace used.
4) no fuel furnace exhaust furnace heat loss, so high thermal efficiency.
5) is easy to control the temperature, to facilitate remote control and fine tune.
6) capable of rapid heating.
7) Operating performance is good, do not pollute the environment.
Furnace shortcomings
A) the need to increase distribution equipment costs.
2) high cost of electricity.
3) resistance when the heating temperature exceeds 1000 ℃, refractory materials may be electrically conductive, insulating problems need to pay attention.

Compartment quick furnace

Compartment rapid heating furnace Products:
Do not Fragment furnace temperature uniformity throughout the large ingot heating periodic temperature regime (ie furnace temperature divided by the time the warm-up period, the heating period, the soaking period) two chamber furnace types: fixed-hearth chamber furnaces and car bottom furnace the fixed hearth room furnace hearth area generally 1 to 10 m 2. put on a material by manual or simple mechanical; chamber furnaces to heat a larger workpieces, put on a feeder with a special fuel for coal, heavy oil or gas to some furnace in the furnace wall to open a gap, the blank gap into the furnace heating called seam furnace, heating commonly used in small pieces or the long billet ends or local heating of this type of furnace hearth yield per unit area is usually 300 to 400 kg / (m 2 ·), specific heat consumption per ton of steel is about (1.0 to 1.5) × 106 kcal car bottom furnace for ingot weight of more than ten tons to hundreds of tons of heating before forging, furnace chamber or tunnel. heating objects placed in the trolley furnace loading and unloading by the workshop crane or other traction devices trolley pulled into or out of the furnace, the large ingot heating requirements furnace temperature evenly distributed, so the car bottom furnace normally distributed heating and dispersing smoke (burner and smoke crossing dispersed arranged on the side of the furnace wall).
Compartment rapid furnace work:
Stars chamber quick heating furnace heating chamber placed in a line by a certain compartment provided between the heating chamber and the heating chamber, the transfer roller of the preform is provided in the indoor blanks single (or double root) to which is heated by the heating chamber and the chamber between each heating chamber and adjacent compartments constitute a furnace section, so called furnace section. furnace for rapid heating, oxidation and decarburization applicable in heated circular blanks and steel pipe. compatible with the planetary mill, can be used to heat the continuous casting slab; localized heating of certain steel disadvantage is the low production capacity per unit length of the furnace, the lower the thermal efficiency of the furnace chamber The furnace used for heating before the metal billet or ingot forging does not move when the material is heated;

The advantages of large-scale high-temperature car furnace and framework

Large-scale high-temperature furnace advantages:
· Large-scale high-temperature car furnace using barbed blanket and ultra-lightweight refractory bricks of quality long fiber composite energy-saving structure, the advantages of solid and durable, excellent corrosion resistance, excellent thermal stability and thermal shock resistance, thermal insulation.
2 trolley impact-proof bricks, automatically seal pallet and furnace door rails, foundation installation is not on level ground can be used.
3 · heating element with high temperature resistance alloy wound into a ribbon or spiral, were installed in the furnace side door, the back wall and put silk brick trolley to ensure that the furnace temperature uniformity and stability.
4 microcomputer program control and record temperature curve, high precision temperature control. Automatically in accordance with the process requirements heating, insulation, power-off function. Recording instruments have recorded over-temperature alarm, burnout alarm and other functions.
Large-scale high-temperature the trolley stove car framework:
Large-scale high-temperature trolley stove car frame with steel welding, forming, steel to ensure no deformation at full load. Within the refractory brick masonry, collision-prone parts of the load-bearing parts are built with a heavy brick, reinforced lining structural strength, The Trolley walking self-structure, driven by the reducer sprocket to go round on the tracks. Trolley sealed with double seal automatically labyrinth structure and soft touch, trolley into the furnace through the cam and roller slope sealed automatically rise. Trolley out of the seal groove automatically fall the seal groove seal of sand to fill after having to constantly added. Trolley out of the door lifting are electric control, with electromagnetic brake to prevent inertial impaction furnace, and the chain of control, that is slightly open the door, automatically cut off the heating element, while restoring power to the trolley running gear. Door closed in place, automatically cut off the power to the trolley running gear, while restoring the power of the heating element.
In order to shorten the cooling process time, large-scale high-temperature car furnace roof has speed up the cooling exhaust. Off when the device is heated, cooled to a certain temperature to open and close the open operation at the side of the furnace through a manual mechanism or automatic control by the operator to complete.

Heat treatment resistance furnace design requirements

Heat treatment resistance furnace designed primarily considered a key part of the hob, furnace shell, lining, mouth devices.
First, hob and furnace shell
The role of the hob to bear the load of the lining and the workpiece and the support side of the furnace arch thrust (referring to the box-type furnace vault). Hob usually consists of steel welded into a frame, steel plate, the design reasonable hob and furnace shell should be strong enough, some unscrupulous manufacturers tend to cut corners with little or sheet instead of thick plates earn interest.
The furnace shell role is to protect the lining of, reinforcement furnace structure and maintain the tightness of the electric furnace, which is usually attached to the steel frame welded steel complex. Small laboratory furnace or not to set the oven rack, with thick steel plate welded furnace shell, may also play the role of the hob. The furnace shell thickness not generally in the 2 to 6 mm, and the hearth with a thicker steel plate, the side walls for availability thin steel sheet production. In addition to the protective atmosphere or controlled atmosphere furnace generally use intermittent welding.
Second, the lining
The lining of the role is to maintain the furnace temperature, reducing heat loss, good lining material only have a certain refractoriness, resistance to thermal shock, but also have less heat storage capacity and a certain intensity. The lining is usually the use of lightweight refractory bricks and fiber, except to the extent that it is required to support the site in the mouth or due to gravity.
Third, the furnace port device
Furnace mouth device includes a door (lid), door guides (oven panel) and the clamping device. Furnace mouth device should be well sealed, less heat loss, the door should be larger than the mouth, usually on each side of the door and mouth overlapping 65-130mm, controlled atmosphere furnace, furnace mouth should be tightly sealed. The door is usually made of cast iron or steel. And put silk brick door put silk brick should be higher than the door frame is indentation 10-15mm.

Trolley heat treatment furnace

Car-type heat treatment furnace uses:
Trolley heat treatment furnace cycle furnace operation, mainly used mainly applied to all kinds of carbon steel, alloy steel strip, rod, billets, copper bars, with metal parts oxidation resistance, less oxidizing heat treatment. And temperature control, electronic control systems with the use of fully automated control of heating, heating rate, and all the mechanical action.
Car-type heat treatment furnace features:
1. Car travel and the door lifting are electric, low labor intensity;
2. Lining using the new composite lining savings less heat, uniform heating, compared with the old products, energy-saving more than 20%;
3. The large trolley furnace set at the door and the back wall of the heating elements, temperature uniformity better than the international military standard, beacon specified value;
4. Door panel using a special seal structure, less heat loss and loss of atmosphere, the stability of the furnace gas;
5. According to the different requirements of users, increase circulation fan and ventilation system;
Car-type heat treatment furnace structural features:
The car-type heat treatment furnace heating by electric heating and gas, the structure consists of a single door and double door type, trolleys run by winch traction and trolley comes with a power supply and distribution election. The furnace by the furnace body, the main trolley, the basic components of the traction device, temperature control system, sealing systems, door devices. Gas furnace and another gas supply balance pressure safety systems, combustion control systems, the use of exhaust gas heat exchange system, the combustion air supply regulator device and other supporting components.

Laboratory furnace installation and use what precautions

Laboratory furnace name suggests, also known as batch-type furnace, is not used for continuous industrial production before they are referred to as laboratory furnace. Laboratory furnace is the national standard energy-saving cycle operation furnace, mainly for steel products, metal parts fire, hardening, annealing heat treatment purposes, installation and use what precautions?
1 furnace without special installation, just flat on the interior floor or stand. Controller should be on the table, the work surface should not exceed 5 degrees tilt the controller from the furnace is not less than 0.5 meters minimum distance between the controller should not be placed above the furnace, so as not to affect the controller is working properly.
(2) is connected to the controller and electric furnace power cord, switch and fuse the load capacity of the furnace should be slightly larger than the rated power.
3 wiring, first loosen the screws on both sides around the controller enclosure, and then turn on the cover, connect the power cord as illustrated. Controllers with electric stove and thermocouple cable connection (best to use compensation wire ) would thermocouple thermocouple holder from the hole to insert the furnace, the gap between the hole and the thermoelectric clogged with asbestos rope, and then fixed. (Note: The power phase - and the middle is not reversed, for safe operation, the controller required to be grounded and electric furnaces)
4 Check the wiring is correct then energized, the first on the power switch, and then the controller panel toggle switch on the pull towards the open position, adjust the Settings button, set the temperature to the degree you need, if set the switch to pull to the measurement position, the red light off (NO), also contactor pull sound, electric powered, ammeter indicates the heating current value, the temperature rises slowly with the furnace temperature rise, indicating working properly.
When the temperature rises to the set the desired temperature, the red light off (NO), the green light (YES), electric stove off automatically, stop warming. Later, when the furnace temperature dropped slightly, the green light is off, the red light, furnace and automatic power. again and again, to automatically control the furnace temperature.
5 To check burnout protection device is working properly, the method is: Loosen the thermocouple end, when temperature rose rapidly to the highest point instructions also automatically cut off the heating power, the burnout means good, good reconnected thermocouple , it can work properly.
6 ovens, electric stove the first time or when the long-term disabled again after use, the oven must be its process is as follows:
When the room temperature to 200 ℃ 4 h (open the door so that water vapor circulated)
When 200 ℃ to 600 ℃ 4 h (closed door)
When 600 ℃ to 800 ℃ 2 h (closed door)
7 After use, first on the control panel toggle switch to the off position pull, then cut off the main power switch.

Box-type furnaces history of the development

Box-type furnaces for the creation and development of human progress plays a very important role. China appeared in the Shang Dynasty more perfect copper furnace, the furnace temperature reached 1200 ℃, furnace tubes of up to 0.8 meters. In the Spring and Autumn Period, people on the basis of melting copper furnace further improve temperature mastered the technology to produce cast iron.
1794, the world has witnessed a straight-shaped cast iron melting cupola. After 1864, Frenchman Martin use the British Siemens regenerative furnace principle, the construction of gas fuel heating the first open-hearth steelmaking. He used the regenerators for air and gas preheat temperature, thus ensuring the required steel temperature above 1600 ℃. 1900, power supply gradually enough to start using a variety of resistance furnace, electric arc furnace and a coreless induction furnaces.
1950s, coreless induction furnaces have developed rapidly. Later appeared electron beam furnace, using electron beam to the impact of solid fuel, can strengthen the surface heating and melting melting point of the material. First heating furnace for forging the hand forging furnace, its working space is a concave groove, the tank fill the coal, the combustion air fed into the lower portion of the slot, the workpiece is heated in buried in the coal. The thermal efficiency of the furnace is very low, the heating quality is not good, and only heating small parts, after the development of a refractory brick semi-closed or closed hearth furnace chamber can be coal, gas or oil as fuel , but also electricity as the heat source, the workpiece is placed inside the heating furnace.
For heating large workpieces, there was great for heating ingots and billets bogie hearth furnace, for heating elongated rod member also appeared pit furnace. 1920s and later appeared to improve furnace productivity and improve working conditions for all kinds of mechanization and automation furnace. Industrial furnace fuel resource development along with the fuel and fuel switching technology, but by the use of lump coal, coke, coal and other solid fuels gradually switch furnace gas, city gas, natural gas, diesel, fuel oil and other gases and liquid fuel, and the production of the fuel used and adapted to various combustion devices.
Box-type structure of high-temperature furnace, the heating process, temperature control, and the furnace atmosphere, you will have a direct impact on the quality of the products after processing. In forging furnace, the heating temperature increase the metal, the deformation resistance can be reduced, but the temperature is too high will cause grain growth, oxidation or burnt, seriously affecting the quality of the workpiece. During the heat treatment, if the steel is heated to a point above the critical temperature, and then suddenly cooled, can improve the hardness and strength of steel; if heated to a point below the critical temperature and then slowly cooled, the hardness of the steel and can leaving lower toughness.
In order to obtain accurate dimensions and surface finish of the workpiece, or in order to reduce the metal oxide in order to protect the mold, reducing the allowance purposes, you can use a variety of less or non-oxidizing furnace. No open flame in less oxidation furnace, the incomplete combustion of the fuel reducing gas generated in which the workpiece is heated oxidation loss rate can be reduced to 0.3%.
Controlled atmosphere furnace using the artificial preparation of the atmosphere gas can be introduced into the furnace carburizing, carbonitriding, quenching, normalizing, annealing treatment: in order to change the microstructure, the purpose to improve the mechanical properties of the workpiece. Particles in the flow furnace, the fuel combustion gas, or externally applied to other fluidizing agents, forced flow of the furnace bed of graphite particles or other inert particle layer, the workpiece is embedded in the particle layer to achieve enhanced heat infiltration can also be carbon, nitrogen, and other non-oxidizing heating. In a salt bath furnace, a molten salt solution as a heating medium, to prevent oxidation of the workpiece and decarburization.
In cupola furnace smelting iron, are often subject to coke quality, air supply, charge air temperature and other circumstances and conditions, the melting process is difficult to stable, easy access to quality hot metal. Hot air cupola can effectively improve the hot metal temperature, reducing alloy burning, reduce the rate of molten iron oxide, which can produce high quality cast iron.
With the emergence of coreless induction furnaces, cupola has gradually been replaced by the trend. This induction furnace melting iron level work without any restrictions, to a hierarchy from the smelting of iron, quickly switch to another level of iron smelting, help to improve the quality of molten iron. Some special alloy steel, such as low carbon stainless steel and roll and the turbine rotor of the steel used, or a general need to be open hearth arc melting out of the molten steel in the vacuum refining furnace and argon in addition to miscellaneous stirred further refine the High purity, high-quality steel capacity.
Flame furnace fuel source wide, low price, ease of local conditions to take a different structure, help to reduce production costs, but the flame furnace difficult to achieve precise control of environmental pollution, low thermal efficiency. Furnace temperature uniformity and ease of features to achieve automatic control, heating and good quality. By way of energy conversion, electric furnace can be divided into resistance furnace, induction furnace and electric arc furnace. In unit time and unit area of ??the hearth furnace heating ability is called furnace productivity. Faster heating furnace, the furnace loading increases, the productivity of the furnace is higher. In general, the higher the productivity of the furnace, the heating unit of heat per kg of material consumption is also lower. Therefore, in order to reduce energy consumption, it should be at full capacity to maximize the productivity of the furnace, while the combustion of fuel and combustion air system to implement the automatic ratio adjustment, the amount of air in order to prevent excessive or inadequate. Also, to reduce heat loss and storage furnace wall, water-cooled heat loss components, all openings radiative heat loss, the heat removed from the flue gas losses.
Heating the metal or materials absorb the heat and the heat supplied to the furnace, is known as furnace thermal efficiency. Than intermittent continuous furnace furnace thermal efficiency, since the production of a continuous furnace is high, and is uninterrupted, the furnace heat system in a stable state, there is no periodic regenerative furnace wall loss, but also because the furnace has an internal pre- hot charge section, some heat to the furnace gas inside a furnace charge preheating section into the furnace flue gas residual heat is absorbed by a cold work, reducing the temperature of the flue gas from the furnace.
In order to achieve the required oven temperature and a constant heating rate, in addition to according to process requirements, preheater and furnace mechanical type, the fuel and combustion device classes, box-type furnaces exhaust methods to determine the furnace structure fine, but also the need for fuel and combustion air flow and pressure, or other control variables on the electrical power control unit through a variety of mutual adjustment, to achieve the furnace, the furnace atmosphere or in the automatic control of the furnace pressure. Gas is liquefied petroleum gas, natural gas, coke oven gas, city gas, converter gas, mixed gas, producer gas, blast furnace gas, etc..

 

Laboratory furnace heating method used

1, the heating
⑴ direct heating: Suitable for high temperature decomposable in solution or pure liquid, usually placed in containers filled with liquids, asbestos online with a gas lamp (or experimental furnace) heating.
⑵ heated on a water bath: For above 100 ℃ decomposition or combustion of volatile solution or pure liquid.
⑶ heated on the sand bath: General requirements at 100 ~ 400 ℃ heat evenly between those suitably heated sand bath.
2, evaporated
And heating the liquid, like, according to the thermal stability of the liquid, respectively by direct heating, water bath heating and a sand bath heated to evaporate. In order to accelerate the evaporation rate, in addition to an appropriate increase in temperature, the need to expand the evaporation area. Evaporation pan evaporation container used. During evaporation, the evaporation of the liquid remaining in plate should not exceed the total capacity of 2/3.

Furnace safe operating procedures

The use of high-temperature furnace heating current to the furnace heating elements or heating medium, and thus the workpiece or industrial furnace for heating materials. Industry resistance furnace divided into two categories, periodic furnace operation and continuous operation furnace, tube furnace is a high-temperature furnace, a unique feature has a simple structure, temperature uniformity, easy to control, heating quality is good, no smoke, no noise, etc., but with higher fees. Use high-temperature tube furnace furnace should strictly follow safe operating procedures to do, to ensure the safety of personnel and to avoid the furnace, the workpiece damage.
First, before work processes
1, check the furnace is clean, clean up debris to ensure the furnace clean.
2, check the furnace wall, floor furnace for cracks and other damage.
3, the resistance wire and thermocouple leads to the installation of fastening rods, check the meter is normal.
4, check the resistance furnace door switch is flexible.
5, to ensure that the normal, they began to put the workpiece.
Second, the work flow
1, put the workpiece to ensure that power is off.
2, gently so as not smashed heating elements, furnace floor, etc.;
3, put a wet piece is strictly prohibited, furnace heating of the workpiece and the heating element should be kept 50-70mm distance; workpiece should be placed neatly, not stacked too high in order to avoid damage the thermowell
4, the work examine the various instrumentation and, if abnormal, timely maintenance.
5, high-temperature furnace at 700 ℃ or more, are not allowed to open the door to cool down or baked, so as to avoid quench furnace shortened lifespan.
Third, the work process.
1, cut off the power supply
2, gently work, make sure not to damage the furnace and the workpiece.
3, replace furnace, according to the above procedure is repeated.
4, clear theory within the debris to ensure clean.
5, pay attention to routine maintenance work.

The RCW series of mesh belt heat treatment furnace

RCW series mesh belt heat treatment furnace:
The RCW series mesh belt heat treatment furnace with a high degree of automation, easy to adjust the parameters, low labor intensity, do not pollute the environment, energy conservation, etc., can be widely used in light machinery, textile machinery, weapons industry, mechanical and electrical industrial mass production The heat treatment of small and medium-sized workpieces.
Furnace shell is welded by steel plate and steel lining Light clay and aluminum silicate refractory fiber as a heat insulation material.
RCW series mesh belt heat treatment furnace lining structure:
RCW series mesh belt heat treatment furnace, furnace the backing insulation layer bulk density 0.8 high insulation bricks, insulation layer on both sides full aluminum silicate fibers, furnace shell surface pad with a layer of asbestos board (low temperature thermal conductivity minimum); lid insulation fiber acupuncture blanket module, with a special method of anchoring the lid on a steel plate (commonly known as the ceiling structure). This structure has good insulation effect, low energy storage, heat loss, good thermal shock resistance, easy maintenance and many other advantages. Greatly improve the life of the lining. The parameters of the furnace air furnace loss power, the temperature rise of the furnace wall, the furnace temperature uniformity better than national standards.
RCW series mesh belt heat treatment furnace temperature control instrumentation:
RCW Series mesh belt heat treatment furnace heating temperature control using the Japanese island of Yan / Island power (Shima) smart temperature. The instrument configuration module of self-tuning PID operation and standards can effectively prevent the temperature overshoot the same time, the instrument can function selection, configuration and parameter setting and digital display of set and actual values. Main heating SCR series of modular three-phase thyristor power controller, the use of continuous on-off control, it is not a traditional electrical on-off continuously and automatically adjust the heating power, but according to the temperature control requirements. High-power high precision temperature control, no noise, no interference in the internal grid.
RCW series mesh belt heat treatment furnace uses:
RCW Series mesh belt heat treatment furnace is mainly used for medium heat hardening, the thin layer carburizing and carbonitriding and subsequent tempering. Widely used in mass production of small and medium-sized parts, such as solid pieces, chains, bearings, small weapons, hardware tools, elastic components, sewing machines, bicycles, car and motorcycle, agricultural machinery parts quenching or thin smooth protective atmosphere carburizing and carbonitriding. According to the different kinds of steel, can be water, oil or molten salt quenching tank quenching agent.

Vacuum hot pressing furnace use Common Faults and exclusion method

High vacuum pumping on but does not leak (mean value of the vacuum table for a long time does not move)
Possible causes:
1. High vacuum gauge tube aging
 2. Diffusion pump oil aging
Solution: Replace the vacuum gauge; replacement diffusion pump oil.
But not on the low vacuum pumping does not leak (mean value of the vacuum table for a long time does not move)
Possible causes:
1 low vacuum current regulatory work incorrectly.
2. Mechanical pump oil aging
Solution: Adjust vacuum gauge tube current; replacement of mechanical pump oil.
Thermocouple automatic access failure, warning lights alarm
Possible causes:
1. Inner and outer limit failure.
2. Out of the motor does not turn.
Solution: Adjust or replace the external stopper; tests whether the motor has been broken, such as the replacement of the same type of motor bad. (Note) within the furnace limit should be observed before heating indicator light should be lit.
After a period of time the temperature does not rise up
Possible causes: heater resistance value becomes larger.
Solution: According to instructions to transfer large instrument output power; serious aging can only be replaced with a new heater
Incase control panel lights are on and the police overcurrent
Possible causes: heater shorted
Solution: Open the lid heater observe whether there is a short circuit, troubleshooting.
Over-temperature alarm and alarm lights on
Possible causes:
1. Over-temperature furnace
2. Instrument is set incorrectly
Solution: Press the manual reset over-temperature alarm parameters
Without water is lit and the alarm
Possible causes:
1. Valve did not open
2. Water pressure is too low
Solution: Open the valve; increase water pressure.

High temperature laboratory furnace lining thickness detection technology

High-temperature furnace lining life directly affects the overall life of the high-temperature furnace, today mainly talk about how to detect corrosion of furnace lining, describes several practical ways.
1, the resistance method
The lining is embedded in the resistive element, and lining the inner surface of the front of the sensor alignment, through a lead connected to the measurement system, the resistance value of the resistance element related to its length, as the resistance element and lining synchronization loss, resistance changes, the use of appropriate measurement meter element output measured electric signal line can be measured remaining thickness of the lining.
2, the capacitance method
Capacitance method and electrical resistance similar to the lining sensor is embedded coaxial circular capacitor, the capacitance value corresponding to its length relationship can be determined by measuring the capacitance value of the thickness of the furnace masonry.
3, heat detection
According to thermodynamics, temperature, thermal conductivity and thickness of the furnace wall of the heat intensity, the furnace lining, thermal conductivity is fixed, the temperature and heat flux intensity furnace wall thickness can be obtained.
Heat lining temperature sensor installed in the lower part, by cooling the hearth wall water temperature, heat flux intensity is calculated, and then the temperature inside the brick lining with galvanic the measured temperature value, calculated baked wall thickness.
4, the stress wave method
Stress wave signal has a high sensitivity to structural defect, when the stress wave propagation in a medium, in case of holes, cracks and other discontinuities in the interface occurs reflection, refraction, scattering, and mode conversion, the use of stress wave characteristics cooling can determine the thickness of the wall material.
Future trends in the lining thickness measurement is a combination of different methods. Furnaces, blast furnace body, the furnace can be long waist galvanic method or resistance method; Hearth Bottom parts can heat detection method or model extrapolation;-line monitoring, we can use the stress wave method.

Muffle furnace, box-type resistance furnace installation and use

Muffle furnace in China generic name for the following: furnace, resistance furnace, Burnout Furnaces, muffle furnace. Muffle furnace is a common heating equipment based on appearance and shape can be divided into box-type furnace tube furnace crucible furnace. Divided by nationality of domestic and imported muffle muffle furnace. Distinguished by the heating elements are: electric stove Sima Fu furnace, muffle furnace silicon carbide, silicon molybdenum rod muffle furnace; according to the rated temperature to distinguish generally divided into: 900 degrees series muffle furnace, muffle furnace 1000 degrees, 1200 degrees muffle furnace at 1300 degrees muffle furnace, muffle furnace 1600 degrees, 1700 degrees muffle furnace. Press the controller to distinguish between the following categories: pointer table, ordinary digital display table, PID regulation control table, the program control table; distinguished by insulation material: ordinary firebrick and ceramic fiber two kinds.Muffle furnace cycle mode of operation for the laboratory, industrial and mining enterprises, scientific research units for elemental analysis and general small steel hardening, annealing, tempering heat treatment, heating, high temperature muffle furnace can be made of metal, ceramic sintering, dissolution , analysis, high-temperature heating.Muffle furnace installation and use:1, after opening the package, check the muffle furnace is intact, accessories are complete. General muffle furnace does not require special installation, just flat on the ground or indoor flat shelf. Controller should avoid vibration, placement and should not be too close to the furnace, to prevent overheating and causing internal components can not work properly.2, a thermocouple inserted into the furnace 20-50mm, the gap between the hole and the thermocouple asbestos rope packing. Connect the thermocouple to the control is best to use compensation wire (or insulated steel core wire), pay attention to the positive and negative, not reversed.3, in the power cord into the power switch at the need to install in order to control the power. To ensure safe operation, the controller must be grounded furnace.4, prior to use, the thermometer indicator adjusted to 0:00, in the use of wires and cold junction compensation compensation, should the mechanical zero adjustment to the cold junction compensator reference temperature point, do not use compensation wire, then the mechanical zero adjusted to zero-scale bits, but the indicated temperature measurement points and the thermocouple cold junction temperature.5, after confirmation by checking wiring, cover the controller enclosure. The temperature indicator setting pointer adjustment to the desired operating temperature, then connect the power. Turn the power switch, then the green light on the temperature indicating instrument both light, relay start working, electric powered, ie a current meter display. As the internal temperature furnace, the temperature is gradually increased indicating instrument pointer, this phenomenon indicates that the system is working properly. Furnace heating, constant temperature, respectively, the temperature indicator of traffic lights, the green light indicates warming, red light means constant temperature.Maintenance and precautions:1, when the first use of a muffle furnace again after disabling or long-term use, the oven must be carried out. The oven temperature 200 ℃ time should be four hours. 200 ℃ to 600 ℃ four hours. When used, the furnace temperature shall not exceed the maximum rated temperature, to avoid burning heating element. Prohibit the furnace infusion of liquid and soluble in a variety of metals, Burnout oven below the maximum temperature of preferably below 50 ℃ work, then furnace wire has a longer life.2, muffle furnace and the controller must not exceed 85% relative humidity, no conductive dust, explosive or corrosive gases in the workplace. Where the grease is attached to a metal material being heated, the volatile gas will affect a large number of heating element surface and etching, so that destruction and shortened life span. Therefore, the heating should be timely prevention and well sealed containers or suitable openings to be eliminated.3, muffle furnace controller should be limited to the ambient temperature 0-40 ℃ range.4, according to the technical requirements, regular and frequent checks furnace, the controller of the wiring connection is good, whether the indicator pointer moves stuck stranded phenomenon, and because electricity meter calibration potentiometer magnets, demagnetization, up wire, shrapnel fatigue, balance error increases caused damage situation.5, thermocouples do not suddenly pull out at high temperatures to prevent the jacket burst.6, and keep the furnace clean, timely removal of the furnace oxide and the like things.

 

Box furnace slagging furnace main reason

Ash slagging itself, mainly with ash softening temperature, ash composition of various compounds (sulfur, iron content of large, low ash melting point), in which the atmosphere of ash (ash in a reducing atmosphere than low melting point, the oxidizing atmosphere) and other factors.
 Box furnace slagging external factors:1, the combustion space gas shortage;2, the fuel and air mixture is not sufficient;3, the flame deflection;4, the boiler overload operation;5, the furnace exit gas temperature increased (the lower chamber of air leakage, excessive amount of air, with the wind properly, coal and so will the flame is too rough on the move, exit gas temperature rise);6, box furnace boiler design capacity of the furnace volume heat intensity election too big. Power plant boilers, turbines, electrical, water treatment and other industries and technological exchanges thermoelectric specific analysis: You plant using low-quality bituminous coal, but look at your burner arrangement (not used classification with the wind), so I think you burning coal Although it is inferior bituminous coal, heat certainly is not high, but the ash content does not it (you did not specify ash content). Then cause the furnace slagging serious cause I speculated that it might still run to adjust the problem!Generally prevent the top box-type furnace slagging adjustment principles are: to maintain a low velocity air flow and a secondary air descending from top to bottom with the wind principles to control the burning rate, reduce the flame center position. I mention this statement and your method of adjusting the opposite; another one if it is caused by the back wall of flame center top side slagging, that both sides should try to tune the amount of wind or wind speed to be effective (which transfer large side of the air flow, depending on the inscribed circle is tangent or tangential).Cold ash hopper at the lower slagging analysis there are two possibilities: First, under the care of coal particles secondary air suction enough; if it is for this reason that it is appropriate to increase the lower secondary air, which prevents cold ash bucket Results residue, but not as you said to tone the back wall of the lower part of the hopper slagging severe cold, and opened the back wall of the lowermost two share a large secondary air), I think the key thing is to analyze the tangential way, then Press the airflow direction to reduce the back wall of the adjacent angles lower secondary upstream wind speed, while increasing the back wall an angle appropriate under secondary air; two are mixed under the direction of the back wall of the secondary air velocity is too large, causing the downstream (after wall side) a secondary air jet separation, the lower the position of the local coal combustion. The adjustment method should also be reduced back wall of an adjacent angles under the upstream secondary wind speed.

 

The nature and application of resistance furnace

The use of current so that the furnace heating element or heating medium heat, thereby heating the workpiece or material for industrial furnaces. Resistance furnace in the machinery industry for metal heating before forging, metal heat treatment heating, brazing, sintering powder metallurgy, glass, ceramic firing and annealing, low melting point metal melting, sand and paint film layer drying.
Since the discovery of heating effect of current (ie Lenz Heights - Joule's law) after heating method first used in household appliances, small electric stove and later used in the laboratory. With the invention of nickel-chromium alloy, into the 1920s, resistance furnace has been widely used in industry. Industrial use of resistance furnace generally consists of heating elements, masonry, metal casing, door, furnace mechanical and electrical control systems and other components. Heating power from less than one kilowatt to thousands of kilowatts. Working temperature below 650 ℃ low temperature furnace; 650 ~ 1000 ℃ in temperature for the oven; 1000 ℃ above furnace. At high temperature and medium temperature furnace heating mainly by radiation. In the low-temperature furnace convection heating methods places, electric components are mounted on the duct, through the fan forced air circulation furnace in order to enhance the convective heat transfer. There chamber resistance furnace, pit, car type, pusher, stepping, muffle type and tunnel type and other types. Controlled atmosphere furnace, vacuum furnace, furnace, etc. are also flowing particle resistance furnace.
Heating element has high heat resistance and high temperature strength, low temperature coefficient of resistance and good chemical stability. Materials commonly used in metal and nonmetal two categories. Metal heating element materials are nickel-chromium alloy, chromium-aluminum alloy, tungsten, molybdenum, tantalum, are generally made of spiral, wavy line, and a wave plate with a waveform. Non-metallic materials are silicon carbide heating elements, molybdenum disilicide, graphite and carbon, are generally made of rods, tubes, plates, with other shapes. The distribution of the heating element and the line connection, according to the size of the furnace and the furnace power requirements.
Resistance furnace and flame furnace, has a simple structure, temperature uniformity, easy to control, heating, good quality, no dust, no noise, etc., but the use of the higher fees.

The basic sequence of experimental furnace masonry and methods

Laboratory furnace, furnace masonry and methods of the basic sequence is as follows:① bottom masonry, including the passage at the end. Qi Hao large brick insulation brick and kaolin after the masonry wall at the inside and outside to relax 30-50mm leveling. Multilayer structure underground masonry elevation negative deviation must be controlled, the bottom of the total thickness tolerances generally-3mm. In the bottom layer of kaolin large brick laying above chrome ramming as a sealing layer to prevent liquid penetration to the corrosion resistance of glass poor clay layer.② In the bottom steel structure on the basis of acceptance, according to the baseline and experimental furnace construction furnace, furnace centerline release related to feeding port, front and rear bubbling and forming pathway of Taiwan brushed drain board centerline.③ lifting column. Interim measures to stabilize the column, and then install the ballast ballast according to design requirements angles, columns and ballast ballast angle must be close to the same time determined the exact elevation.④ masonry wall, including the passage wall. The bottom brick masonry wall must ensure that the level of degree, or to the bottom of the tile area for processing until it reaches the requirements. Multi-wall brick building, the first in the field after the operation to make sure the furnace size, non-timber hewn side facing brick hearth. Masonry joints to be staggered corner pressure, strictly maintain verticality.⑤ masonry parapet, the front wall, back wall and channel flame space. Masonry parapet bracket should be carefully examined, pallets and bearers installed after passing. Masonry brick and chest wall hooks have taken measures to prevent the dumping of the kiln.⑥ big arch masonry. Production arch tires, do carry through gantry sedimentation test and check the corresponding size, the big arch masonry to the center from both sides simultaneously, and requires continuous operation, try to control! * + Complete. Large arch insulation layer construction after the end of the kiln to be baked.⑦ masonry flue, chimney. Kiln debris must be cleared, and with a vacuum cleaner after masonry. Laboratory furnace, furnace flue and chimney masonry, but also compatible with the metal heat exchanger, access paths masonry chimney must be completed before other masonry.Is there any way masonry kilns?Masonry method of wet and dry assemble puzzle two ways:Wet puzzle parts: the Ministry of flames melted the side walls and arch roof space, flue, chimney and furnace insulation bricks, masonry used in the wet mud should be based on material used in the preparation of the corresponding fire clay bricks.Dry assemble parts: melting section and the bottom path, wall, brick fire space parts of the hook, melting section and flue arch arch bricks, fused brick and path roof tiles.Well-designed laboratory furnace, furnace, must be carefully masonry, masonry quality for life of the furnace, fuel consumption, glass melting and drawing operations has a significant impact. In order to meet the brick kiln kiln body size and masonry materials such as thermal expansion of basic requirements, so the furnace wall tiles, tile bottom Cutting should be carried out. Further expansion joints between bricks kiln reasonable reserve is extremely important aspects.

The use of ceramic fibers

Varnish application effect
The protective coating material to the surface of the refractory substrate firmly adhered, siloxane bond, structure compact and hard, especially refractory surface coated with silicon carbide, the protective layer formed by the aluminum-rich layer and a silicon oxide layer rich composition, can prevent the erosion of oxygen and combustion gas, oxidation with good effect, to prevent deterioration of the refractory.
Application Examples
The size of 70 mesh and 150 mesh alumina ceramic fiber equal to the same fiber blend, and then to take the mixed ceramic fiber 38% silica sol as the main component 61.8% inorganic binder, and then with 0.2% carboxymethyl cellulose with a viscosity of 10 poise fire resistant protective coating agents, coating thickness in the range of 0.7-7mm, the change in thickness per 0.1mm were coated on the surface of the silicon carbide refractory plate, into a maximum temperature of 1350 ℃ firing kilns into 12 hours, removed, impact resistance values ??measured. Measurement results showed that the protective coating having a thickness of 1mm, the impact resistance is not coated with a refractory coating material 14 times. However, the protective coating should not be thicker, because the coating thickness is too thick, although the value to be improved impact resistance, but peeling rate and increases contrast.
Another will be formed into the same protective coating HPL firing kiln, heated to 300 ° ~ 900 ℃, immediately remove, room temperature quench cracking observed state, the results did not HPL surface cracks appear, and subjected to quench after heat shock, flexural strength at 900 ℃ for quench temperature than the unprotected fireproof coating by about 15%. In addition, with protective coating HPL may continue to 1350 ℃ high temperature, life is no protective coating HPL 2 times.
As seen from the fire-resistant protective coating material coated with the furnace, flue and other high temperature refractory material surface under an atmosphere, to form an effective protective layer of refractory material to prevent damage to the substrate, extending its life and reduce maintenance and maintenance times, saving refractories and construction costs, bring significant economic benefits. The protective coating material used in various refractory materials and refractory metal components.

The role of the thermocouple protection tube

Thermocouples are the most widely used temperature sensors. The long-term stability of thermocouples, life and other performance indicators are closely related with the protection tube. Thermocouple failure rate depends directly on the level of protection tube material properties.
With the increasing degree of automation, temperature measurements related to all areas of the national economy, such as industry and agriculture, national defense, scientific research, medical, health, environmental protection, meteorology and space sectors. Thermocouple its stable performance, accurate and reliable, simple structure, easy to use, wide temperature range, the signal can be remote, etc., in areas such as industrial production and scientific research has become the most widely used temperature sensing element. The long-term stability of thermocouples, life and other performance indicators are closely related with the protection tube. According to statistics, the thermocouple measurements in the normal range, the failure rate depends directly on the level of protection tube material performance is excellent. Thus, in actual use the correct choice of the protective tube, the thermocouple is to extend the service life of the premise.
Action
Thermocouple protection tubes primarily for two purposes, first, to prevent mechanical damage suffered; second is to protect the thermocouple from the measured medium chemical corrosion, oxidizing or reducing atmosphere free from the harmful effects of the thermocouple as at close of its most good atmosphere. Therefore thermocouple must be protected, so that is not bad atmosphere against.
Thermocouples used in the following media must be isolated:
1. When a change in contact with the thermocouple thermocouple metal chemical composition (solid, liquid, gas)
 2. Thermocouple materials will corrode furnace gas and other vapors (sulfur and its compounds are particularly harmful).
 3. Thermocouple materials can corrode various electrolytes.
Thermocouple protection tube is usually a single protection tube, in some special cases, can be installed to protect two concentric tubes. Close to the thermocouple protection tubes called main, outer protective tube called supplementary protection tube. Usually alumina tube-based protection tube, silicon carbide tube combination auxiliary protective tube sets constitute protective tube to get a good overall performance, such as with anti-flame cutting, thermal shock, or to prevent mechanical damage and so on.

How to take care after the closure of industrial furnaces

In the long-term disabled industrial furnace, the furnace should pay great attention to external corrosion maintenance problems.
First, in the industrial furnace shut down after cooling, heating surface must be thoroughly cleaned of dust and grate upper furnace bottom ash. And then to maintain a certain degree of natural ventilation flue. Generally, in order to be in the furnace moisture, placed in the flue desiccant. As with quicklime as a desiccant, each cubic meter chamber or flue should generally be placed around 3kg. After placing all the ventilation should be tightly closed doors. Variable to be replaced after lime powder.
Locations such as industrial furnace room lying, flood tide serious ground during shutdown when a small fire should be used frequently baked and placed desiccant combined approach. If the industrial furnace shut down for a long time, after the complete removal of soot in the furnace metal exterior topcoat Hongdan oil or other anti-corrosion paint.
As for the inside of the furnace corrosion maintenance shutdown method, according to the length of time to be shutdown. Generally, the shutdown can not exceeding one month wet maintenance, more than one month should be taken care dry.
Dry maintenance should note the following questions: Do not direct contact with the desiccant industrial furnace metal surface, can be installed in a container such as iron plate; placed desiccant, to shutting the other hand hole and manhole covers, gas, water pipeline The valve must be truncated; quicklime change powder should be replaced.
The use of wet maintenance, pay attention to the furnace condensate water is best to use, followed by the original boiler water can again be softened; adding alkali, the boiler water with Weihuo heated to 80 100 ℃ pressure rose to 23 tables after pressure protection 23 hours to reach the furnace circulating water alkalinity balance, the pressure is reduced, then the boiler water to fill, causing 1.5 4 gauge and maintained throughout the warranty period this pressure, alkalinity should be regularly testing, lowered, should be ready to add.

Box-type gas roaster

The box-type gas roaster box-type structure, furnace by high temperature refractory brick layer, the lightweight insulation brick layer, high temperature insulation layer and steel body, furnace fire-resistant insulation effect. Two glib bilateral gas, high-speed vortex pump air, heat recovery unit preheat the intake flue non-vertical-type structure, catenary door lifting mechanism, lightweight and reliable.
Box-type gas the roaster combustion system:
Controlled by the fan, temperature sensor, temperature controller, and the like within the feedback loop system, the combustion system in the automatic control is within a range of 800 to 1200 ° C, quenching automatically ignition, maintaining constant temperature, gas savings.
Bilateral burning furnace combustion flame vortex is formed, the mold shell more fully absorb the heat fast heating, temperature uniformity, high thermal efficiency, heat recovery unit preheat intake flue gas discharged by the non-vertical-type flue, the furnace combustion better, more energy efficient, faster heating rate.
Box-type gas roaster purposes:
The box-type gas roaster roasting and heat treatment of steel and other places for the investment casting industry formwork. Double nozzle, bilateral gas, to form a flame vortex; waste heat recovery the intake preheating, improve combustion efficiency; high-speed vortex pump air-stable; energy-saving, low energy consumption conditions, roasting heating up fast.

Use hot pit furnace care and maintenance

(A) does not exceed the maximum oven temperature 950 ℃.
(2) into the housing part is not higher than the upper end of charge.
(3) does not allow the muffle furnace temperature higher than 400 ℃, open the lid intense cooling.
(4) is not loaded with moisture and oil of the workpiece.
(5) No protection framework is not the case, the use of the furnace.
(6) the pit furnace cleaned once a month, remove oxide and other contaminants.
(7) monthly check lid, furnace lining, and found damage to be repaired.
(8) monthly check resistance wire leads rod chuck fastening, descaling and timely tighten the clamps.
(9) monthly check instrumentation, thermocouple, and to be calibrated.
(10) on a monthly basis lid lifting mechanism for lubrication.
(11) Note that the case of heating elements, temperature is not normal when found, but should be carefully checked and found damage to the timely replacement.

Oven works

Oven enclosure generally use thin steel plate, the surface paint, oven studio using high quality structural steel production. Between the shell and the studio filled with aluminum silicate fibers. The bottom of the heater is installed, it can be placed at the top or sides. Temperature control instruments using digital smart table, PID regulation: Configuration 999.99 hours time controller with alarm device is connected. The oven's operation more simple, fast and effective.
Oven wide range of applications:
For chemical gas baking and food processing industries want baked goods, substrate stress removal, ink curing, drying paint film. Widely used in electronics, electrical, communications, plating, plastics, metals, chemicals, food, printing, pharmaceutical, PC board, powder, impregnation, spraying, glass, ceramics, wood and building materials.so precise baking, drying, tempering, preheating, stereotypes, and processing.
Oven works:
Digital instrumentation through a connection with the temperature sensor to control the temperature, the use of hot air circulating ventilation, air circulation system is divided into horizontal and vertical. Were confirmed by accurate calculation, the wind source is driven by the wind turbine blower motor operation via electric heaters, hot air duct into the oven to the studio, and will use the air intake duct after a re-circulating air source heat utilization This can improve the temperature uniformity. Be used as door switch, air circulation system can quickly restore operating state temperature value.

Alumina refractory concrete application of special

(1) ultra-high temperature kiln lining structural materials.
(2) high purity metal alloys with rare metals smelting crucible purification.
(3) high-temperature tube furnace thermocouple tube heat insulation.
(4) high-temperature kiln sticks and briquetting pressure washers, etc.
(5) Petroleum and Chemical Industrial temperature corrosion-resistant lining material.
(6) do transparent alumina ceramic high-temperature high-pressure sodium viewing glass tube microwave hood.
(7) in the electronics industry to make the circuit substrate voltage ceramic shell and tube seat tube radome spark plugs and so on.
(8) grinding tools and abrasives such as grinding wheel cutting disc Dies La Sita round nozzles textile porcelain pieces and a variety of high-temperature resistant bearing props.
(9) Chemical Industrial Piston Pump Parts sealing ring.
(10) ferrous metallurgy industry molten metal pipe.
(11) high-temperature industrial sectors efficient, energy-saving materials; such as hollow ball-like alumina, alumina whiskers, alumina fiber and products.

Trolley furnace overhaul Precautions

1 with corrosive, volatile, explosive gases into the furnace processing of the workpiece is strictly prohibited, so as not to affect the heating elements and refractory life and cause explosions and other accidents.
(2) shall not exceed the furnace temperature operation, otherwise it will shorten the life of the equipment.
3 oxide into the blast furnace of the workpiece to be too clear, available under the wire brush.
4 piece uniform stacking, from the heating element should be around 100-150mm.
5 is strictly prohibited barbaric operation, the workpiece should be light, to avoid shocks.
6 used furnace operator must not leave jobs, you must always pay attention to the working conditions are normal furnace.
7 furnace during loading and unloading the workpiece, you must first cut off the heating element power to ensure operator safety.
8 furnace oxides (including electric wire under) should always be cleaned at least once a week or five times a furnace. Furnace blowing with compressed air under the floor.
9. Resistance wire as it used, you can not bend the collision to avoid breakage.
10 furnace motor requiring regular inspection, lubrication, etc., pay attention to the use of safety.
11 at the shaft sleeve must always check lubrication to prevent damage due to lack of oil and bushings.
12. Periodically check the use of the heating element. The heating element is not kinked short-term use after the collision. If you have not heavily corroded and broken, can be used with the electric wire of the same material (or electric wire itself) as an electrode, the use of acetylene gas for heating welding electrodes using 50% Baiyun powder mixture, if the heating element can not be used when severe corrosion, should be replaced.
13 Regular calibration instruments, thermocouple usage prevent instrumentation, thermocouple temperature measurement errors caused by incorrect affect product quality.

Industrial smelting furnace strengthen technology

Industrial furnace is an integral part of the production of special steel smelting equipment. More intense competition in the industry, about 45 minutes or so the conventional converter steel, the use of industrial furnace about 70 minutes, therefore, how to further reduce the electric arc furnace smelting time, reduce consumption, and thus significantly reduce costs, a number of special steel enterprises development of the internal needs. Commonly used to strengthen the industrial furnace smelting technology is:
Industrial furnace against the hot metal technology:
Hot molten iron with a certain amount of physical heat, and contain elements of high carbon, silicon, manganese and high calorific value, Oxygen oxidation can release large amounts of chemical heat to scrap quickly become red hot, very easy to use oxygen cutting, and therefore can make use of against the hot metal, shorten the refining time and improve the efficiency of smelting.
Add Method: industrial furnace against the hot metal roof by first raising the first material is about 50% of the total material weight, and powered Chuanjing to about 8 minutes, power outages and unscrew the lid, lifting equipment that contains molten iron ladle being lifted to the top of the roof, aligned electrode Chuanjing hole parts molten iron poured from the roof furnace for about 3 minutes, then cover the lid is powered smelting.
RCB gun injection technology:
RCB gun has a strong ability to decarbonization, hot metal charging technology guarantee. The RCB gun is usually installed in the electric arc furnace furnace wall. Gun lance oxygen jet at supersonic speeds and keep the long form of cluster injected into the bath, with a strong ability to penetrate intense metallurgical reactions occur, decarbonization speed, and stir the bath, conducive to the temperature of the molten steel, the chemical composition is uniform. To ensure that the the RCB gun blowing oxygen utilization and oxygen penetration capability and high decarburization rate, it is necessary to ensure sufficient oxygen pressure, the Acute excessive decarburization reaction, destroy interested lining refractories, water-cooled furnace wall . Usually the control pressure 1.2Mpa, the decarburization rate of 0.06-0.08% C / min.
3, efficient foaming slag technology:
Foamy slag process is high impedance UHP best choice, good foamy slag can expand the metallurgical reaction interface, and it helps the migration of the reaction product; while being able to achieve a good submerged arc operation, the arc thermal efficiency greatly improved.
The RCB spray gun into oxygen and molten bath of carbon oxidation reaction occurs to produce a large amount of CO gas in a short period of time up to the formation of foaming slag conditions. As the oxidation of carbon in the molten bath, the bath carbon content decreases, the need for timely toner blown into the furnace, in order to maintain the slag foaming, on the other hand, can also reduce the iron oxide content in the slag, to improve metal the closing rate. As the reaction proceeded, the basicity of the slag is reduced, foamed slag becomes unstable, required in the smelting process should be timely portionwise addition of lime in order to improve the slag basicity.