- Time:Jul 14, 2022
Refractory bricks are an extremely important part of cement kilns. The normal operation of cement kilns is inseparable from the protection of refractory bricks. If the refractory bricks are damaged or peeled off, it will directly affect the production efficiency of the cement kiln. In severe cases, the kiln needs to be stopped for repair. Therefore, it is very important to understand the factors that affect the service life of refractory bricks. Today, let us talk about what problems may occur with refractory bricks when the cement kiln is operating?
mechanical damage
When the cement kiln is rotated, different degrees of mechanical stress are formed between the refractory bricks and the refractory bricks in the kiln, so the refractory bricks will be squeezed and twisted. If the cylinder of the rotary kiln is deformed, the mechanical stress on the refractory lining bricks will be multiplied, especially the mechanical stress on the wheel belt is the most serious. Therefore, before selecting the appropriate refractory material, it is necessary to understand the mechanical stress of the rotary kiln, so as to select the most suitable refractory material for protection.
hot and cold
When the rotary kiln is in operation, if the temperature of the kiln often encounters rapid cooling and rapid heating, the refractory bricks will be affected by thermal shocks to varying degrees, increasing the risk of fracture of the refractory bricks. Therefore, when the refractory bricks are baked in the kiln after installation, the heating process must be slow, so that the expansion of the kiln cylinder complements the expansion of the bricks to play a compensation role in the kiln body, which is the key to the use of alkaline bricks. If the kiln cannot be dried for a long time in actual production, and the kiln is rapidly heated and cooled, the refractory brick will inevitably be peeled off and damaged, which will greatly affect its service life.
fuel change
If the service life of the refractory brick lining is to be guaranteed and a solid kiln skin effect is to be maintained, the thermal stability is the key. However, it is difficult to maintain the thermal stability because of the uncertainty of the original fuel. The general raw fuel of cement kilns is coal. Due to the difficulty of coal supply, the ash content of coal will vary from 32% to 45%. Due to the fluctuation of coal quality, the kiln skin will be affected, and the kiln skin will easily be combined with the brick body layer. flaking. Especially in the case of kilns that are frequently started and stopped, the protection of the kiln skin is lost, and the refractory brick lining is easily subject to chemical erosion, which reduces the thermal fatigue resistance and greatly shortens the service life.
The above are some common problems in the operation of cement kilns. These examples will directly affect the service life of refractory bricks. When choosing refractory bricks or operating cement kilns, you must pay more attention. Correct selection of refractory bricks and correct operation can effectively prolong their use. The only way to live.
