How to detect the high-temperature furnace lining thickness
Time：2015-07-13 09:15 Click：
Lining means for metal refining furnace furnace wall, using high-temperature ceramics. High-temperature furnace lining life of a direct impact on the overall service life of high-temperature furnace. So, how to detect the thickness of the high-temperature furnace lining it?
1, capacitance method Capacitance method and electrical resistance similar to the lining inside the coaxial circular embedded capacitor sensor, the capacitance value of its length to the corresponding relationship can be determined by measuring the thickness of the blast furnace masonry capacitance value.
2. Stress Wave Heartbeat stress on structural defects is highly sensitive, when the stress wave propagation in the medium, such as encountered in holes, cracks and other discontinuities at the interface, it will happen reflection, refraction, scattering and mode conversion, the use of stress wave characteristics It can determine the wall thickness of the material is cooled.
3, the resistance method Is embedded in the resistive element inside lining, the inner lining surface is aligned with the front of the sensor, through a lead connected to the measurement system, the resistance value of the resistor element is associated with its length, as the resistance element and the lining synchronization loss resistance varies, measured using the corresponding measured element output signals of the instrument, you can measure the remaining thickness of the lining of the line.
4, heat detection According to thermodynamics, temperature, thermal conductivity and the furnace wall thickness determines the heat flow rate, for blast furnace lining, thermal conductivity is fixed, by the difference in temperature and heat flow rate can be obtained furnace wall thickness. Heat flux sensor is installed in the lower part of the lining temperature, by the hearth stave water temperature to calculate the heat flux intensity, combined with galvanic brick lining temperature within the measured temperature value is calculated baked wall thickness.
5, ultrasonic method It is the use of ultrasound propagation characteristics in a solid medium thickness measurement, ultrasonic incident at a certain temperature to the lining into the furnace, the use of ultrasound and reflected in the lining of the propagation time obtained remaining lining thickness.
6, long thermocouple method It is built in a protective sleeve thermocouple several branches of unequal length, and install it in the brick lining to be detected by measuring the change in temperature of each thermocouple infer erosion of masonry. When each point temperature and the temperature gradient between the points stable, when the brick lining is gradually being eroded to a certain location, the site of galvanic will be destroyed, the temperature signal will be abnormal.
7, the model extrapolation Is the use of a thermocouple to establish hearth and bottom temperature field mathematical model as the detection element, thermodynamic theory, software programming methods and numerical analysis to calculate the solidification of molten iron wire and carbon brick erosion lines approximate location.
For more information, please attention: Zhengzhou Kejia official website: http: //www.kejiafurnace.com/