MASONRY METHOD OF REFRACTORY BRICK IN ROTARY KILN OF GARBAGE INCINERATOR

The rotary kiln is an inclined steel cylinder lined with refractory materials. It is an important part of the incineration system. Various wastes are incinerated in the kiln for harmless and reduced treatment. Due to hazardous waste The complexity of the composition brings about the complexity of the chemical composition, and higher requirements are placed on the quality of the lining of the rotary kiln. Not only the selection of suitable refractory materials, but also the high-quality masonry of refractory materials is required.
1. Dry and wet bricklaying
　　The distinction between dry masonry and wet masonry is whether to use wet mud for bricklaying, dry masonry does not use wet mud, and wet masonry is used. Generally speaking, the refractory bricks used in kilns for hazardous waste incineration are wet masonry.
2. Arrangement method and flower arrangement method
　　Arrangement method and flower-laying method are divided into the arrangement method of refractory bricks, both of which belong to the ring-laying method.
　　In practical applications, there is relative sliding between the rotary kiln shell and the refractory bricks. When the flower-laying method is adopted, it can be ensured that the refractory bricks of each ring will not damage the brick corners when they move with each other; when the row-laying method is used, deviations caused by various reasons may cause the brick joints to not be in a straight line. When the refractory bricks move mutually When arranging the refractory bricks by the usual wall-laying method (staggered joints in the circumferential and axial directions), the joints of the bricks in the circumferential direction are small in a straight line, and the refractory bricks are staggered with each other. The strength of the masonry is good, but Damage to one point will cause damage to one surface, which is not conducive to subsequent repairs. Therefore, the rotary kiln refractory bricks for hazardous waste incineration generally adopt the flower-laying method in the ring-laying method.
3. Rotation method and fixed method
　　The difference between the rotary method and the fixed method is that the rotary kiln needs to be rotated during masonry. The rotating method uses screw jacks and wooden squares to fix the already built refractory bricks, which is called jacking method. Other methods include cementing method and channel steel method. The fixed method refers to the use of bricklaying machine to build refractory bricks without rotating during masonry.
The jacking bar method is suitable for rotary kilns with a diameter of less than 4m. Starting from the bottom, building on both sides, using spiral jacks and wooden squares to fix the refractory bricks at the center line. Because its own gravity is close to the inner wall of the kiln: Because the kiln needs to be rotated frequently during masonry, the jacking bar method is more suitable for kiln bodies with a diameter of less than 4m.
The bricklaying machine is suitable for rotary kilns of various kiln diameters. There is no need to turn the kiln during the masonry process, but a problem is prone to occur. When the part above the center line of the bricklaying machine is built, the compressed air pressure of the bricklaying machine is insufficient and the gravity of the refractory brick itself The reason is that there will be a slight gap between the refractory bricks and the inner wall of the kiln. During operation, the refractory bricks and the inner wall of the kiln will slide relative to each other, which will cause the refractory bricks to loosen and fall off.
　　 The diameter of the rotary kiln for hazardous waste incineration is generally less than 4m and the length is 8 to 20m. Therefore, it is recommended to use the rotary method-the top bar method.