The temperature of the garbage is pushed into the grate entrance is 500~600°C, mainly affected by the abrasion of the garbage and the moisture of the garbage. It is easy to cause peeling, so the working layer uses high–strength washing injection material, and the second layer uses heat insulation injection material;(1) The temperature of the combustion chamber reaches above 1000°C, and the lower part of the side wall close to the grate is also subject to garbage abrasion and thermal peeling. Therefore, the working layer (1650°C) uses high–strength, low–cement bonded castables resistant to the chemical attack of high–temperature flue gas, and the intermediate layer (1200°C) and the permanent layer (1000°C) use heat–insulating wash casting materials and insulation materials;(2) The temperature of the slag outlet is 400~500°C, which is mainly subject to mechanical abrasion. Therefore, high–strength castables are used, and heat–insulating castables and materials are used for the intermediate and permanent layers;(3) High–temperature flue (or secondary combustion chamber) The temperature is 800~900°C, so castables or sprayable plastics, and insulation materials are used;(4) The flue temperature of the convective heating surface is 500~800°C, so castables and thermal insulation materials are used. The wall thickness of the sprayable plastic is generally the same as the wall thickness of the brick village, about 180~240. The maximum wall thickness that can be sprayed is 400