Four detection methods for high temperature furnace lining

Four detection methods for high temperature furnace lining

The service life of the lining of a high-temperature furnace is particularly important for companies that need continuous mass production. The long service life of the high-temperature furnace lining can directly reduce many production costs. So how to inspect the furnace lining? The editor knows the following four types:

1. Resistance method
The resistance element is embedded in the furnace lining, and the front end of the sensor is aligned with the inner surface of the furnace lining. The resistance value of the resistance element is related to its length. As the resistance element and the furnace lining loss synchronously, the resistance will change. Use the corresponding measurement The meter measures the electrical signal output by the component, and then the remaining thickness of the furnace lining can be measured online.

2. Capacitance method
The capacitance method is similar to the resistance method. A coaxial circular capacitor sensor is embedded inside the furnace lining, and the capacitance value corresponds to its length. The thickness of the blast furnace masonry can be determined by measuring the capacitance value.

3. heat flow detection method
According to thermodynamics, temperature difference, thermal conductivity and furnace wall thickness determine the heat flow intensity. For blast furnace lining, the thermal conductivity is fixed, and the furnace wall thickness can be obtained from the temperature difference and heat flow intensity. The heat flow detection sensor is installed in the lower temperature part of the furnace lining. The heat flow intensity is calculated through the water temperature difference of the cooling wall of the hearth, and the temperature value measured by the thermocouple in the brick lining is combined to calculate the thickness of the furnace wall.

4. stress wave method
The stress wave signal is highly sensitive to structural defects. When the stress wave propagates in the medium, such as holes, cracks and other interface discontinuities, reflection, refraction, scattering and mode conversion will occur, using the characteristics of the stress wave The thickness of the stave material can be determined.

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