The rotary kiln processes hazardous trash. The refractory material in the rotary kiln will be damaged by the impact of high temperature on the flue gas of hazardous waste and partially molten slag, so appropriate Refractory material selection can significantly raise the rotary kiln's quality.
The purpose of the refractory material used in the roasting of the rotary kiln is to protect the kiln carcass from the influence of the hot material in the kiln (the material's temperature is typically around 1450 °C) or the flame (1600–1700 °C); reduce the radiation and convective heat loss of the rotary kiln carcass. The operation cycle of various cement rotary kilns is mainly determined by the quality of the refractory materials used in the kiln, especially those used in the firing zone of the rotary kiln (including Liboer kiln, suspension preheating kiln and decomposition kiln outside the kiln) and the high temperature zone of the shaft kiln. The quality of wear-resistant materials. In order to ensure the long-term safe operation of the kiln, reduce the unplanned maintenance time of the kiln, and improve the operation rate of the kiln, it is necessary to study the requirements for the refractory materials used in the kiln and the performance and quality of the refractory materials.
Improve the quality of the rotary kiln and choose a refractory kiln to see these points:
01 Resistance to high temperatures
It is important to choose resilient refractory materials for the rotary kiln's interior wall.elevated temperature. When dealing with hazardous trash, high-temperature combustion is necessary if the inner wall Poor high temperature resistance shortens the product's service life and has a negative impact on how it handles. Generally speaking, hazardous trash is burned at a temperature of about 800°C.The rotary kiln typically operates between 850°C and 1000°C.
02 Good strength and wear resistance
The strength of rotary kiln refractories refers to their mechanical strength. Hazardous wastes usually have different shapes and sizes, and their hardness is naturally different. If the strength and wear resistance of the material are poor, it is easy to be damaged by impact and abrasion when the waste enters the kiln and is incinerated, turned and dropped. In addition, dangerous goods will expand during the combustion process, and the shell of the rotary kiln will also generate stress on the refractory material, which inevitably requires the material to have good strength.
03 Good volume stability
The entire inner wall of the rotary kiln is securely wrapped with refractory material. The rotary kiln experiences thermal stress from temperature changes, mechanical stress from the spinning of the cylinder, and stress between the materials when it is operating normally. The temperature change procedure will The volume of the refractory substance decreases due to the expansion agent. Extrusion or gaps between the refractory materials, refractory materials, and the cylinder will occur when the volume stability of the refractory material is inadequate or the volume changes significantly under different temperatures, leading to the material breaking or falling off.
04Good corrosion resistance
A large amount of corrosive gas and slag are produced during the incineration of hazardous waste, which will enter the interior of the material through pores and micro-cracks on the surface of the material, and react with the material matrix to cause embrittlement and peeling of the material. Choose materials with good corrosion resistance can reduce harmful substances to a certain extent Penetration and reaction, prolong the overall service life of the rotary kiln.
