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.

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.