Remediation of cracks in high temperature furnace

High temperature furnace cracks please refer to the following remedial methods;

If there are cracks in the furnace, in general, if the cracks are not particularly large has caused temperature control difficulty increase temperature drift back and forth, do not care about him. But if that happens it's going to be a little bit easier to deal with, don't worry, it's not too complicated. If the crack is less than 10 cm, we can find some high temperature aluminum salt cotton rope to plug the crack in the cold furnace. Remember, when you plug it, make sure it's a little tight and a little flat. The furnace will have to be replaced if the crack exceeds 10 cm. Replace the electric furnace wire at ordinary times the method will open the furnace body, will buy the custom furnace can be placed.

The service life of furnace lining has a direct influence on the whole service life of furnace. This paper discusses how to detect the corrosion of furnace lining and introduces some practical methods:

1. Resistance method

Embedding resistance element is inside of furnace lining, the sensor front aligned with lining the inner surface, through the wire connected to measurement system, the resistance value of resistance element is related to its length, with the loss of resistance element and lining synchronization and resistance change, using the corresponding measuring instrument measured element output signals that can be on-line measurement of the residual thickness of the lining.

2. Capacitance method

The capacitance method is similar to the resistance method in that a coaxial round capacitor sensor is embedded in the lining. The capacitance value corresponds to its length, and 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 thickness of furnace wall determine the heat flow strength. For blast furnace lining, thermal conductivity is fixed, and the thickness of furnace wall can be obtained by temperature difference and heat flow intensity.

The heat flow detection sensor is installed in the lower part of the furnace lining, and the heat flow intensity is calculated by the temperature difference of the cooling wall of the furnace cylinder, and then the thickness of the furnace wall is calculated by combining the temperature value measured by the temperature measuring electric couple inside the brick lining.

4. Stress wave method

Stress wave signals are highly sensitive to structural defects. When stress wave propagates in the medium, such as interface discontinuities such as holes and cracks, reflection, refraction, scattering and mode conversion will occur. The thickness of cooling wall material can be determined by using the characteristics of stress wave.