Three aspects that affect the service life of kiln bricks for cement rotary kiln

Kiln bricks are an extremely important part of the cement kiln. The normal operation of the cement kiln 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 may need to be shut down for repairs. Donc, it is crucial to understand the factors that affect the service life of refractory bricks. This article discusses some aspects that need to be paid attention to in extending the service life of cement kiln bricks.

Factors affecting the service life of kiln bricks for cement rotary kiln

Mechanical damage

When the cement kiln is rotating, le refractory bricks in the kiln will form different degrees of mechanical stress, 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 will double, especially the mechanical stress on the wheel belt is the most serious. Donc, before choosing the appropriate refractory material, you must first understand the mechanical stress of the rotary kiln, to select the most suitable refractory material for protection.

Rapid hot and cold

When the rotary kiln is in operation, if the temperature of the kiln often encounters rapid cooling and heating, the refractory bricks will be affected by thermal shock to varying degrees, increasing the risk of refractory brick fracture. Donc, when the refractory bricks are installed and the kiln is baked, the heating process must be slow, so that the expansion of the kiln body can compensate for the expansion of the bricks and play a role in compensating the kiln body. This is the key to using alkaline bricks. If the kiln cannot be baked for a long time in actual production, and the kiln is rapidly heated and cooled, the refractory bricks will inevitably peel off and be damaged, greatly affecting their service life.

Fuel changes

Thermal stability is the key to ensuring the service life of the refractory brick lining and maintaining a solid kiln skin effect. Cependant, it is difficult to maintain thermal stability because of the uncertainty of the raw fuel. The general raw fuel of cement kilns is coal. Due to the difficulty in coal supply, the ash content of coal varies from 32% à 45%. Due to the fluctuation of coal quality, the kiln skin adhesion is affected, and the kiln skin is prone to peeling off together with the bricklayer. Especially when the kiln is frequently started and stopped, the refractory brick lining loses the protection of the kiln skin and is easily chemically eroded, which reduces the thermal fatigue resistance and greatly shortens the service life. Changes