During the production process of the cement kiln, the following problems will occur due to the high temperature of the kiln:
1.1 The kiln leakage problem
The leakage of cement kiln body is an outstanding problem in the actual operation of cement kiln.Due to the relatively high temperature demand of cement kiln production environment,the molecular structure of the refractory bricks used in the cement kiln us easy to change due to high temperature.Then the bricks expand and cracks occur,which will lead to raw material leakage.This greatly reduces the safety and effectiveness of cement production.
1.2 Wear of kiln bricks
During the production, the dust content in the cement kiln will increase gradually with the increase of temperature, which will lead to the wear problem of kiln bricks.The wear of the kiln brick will lead to the quality loss of the kiln brick.Then the thermal insulation performance is gradually reduced,which directly leads to the temperature loss of the cement kiln body and affects the quality of cement production.
1.3 The ash accumulation of kiln bricks
In the actual production process, due to excessive temperature,there will be serious problem of ash accumulation. Due to the irrationality of the internal structure of the traditional cement kiln and the complexity of the flow direction of the internal air , the ash accumulated on the surface of the kiln brick is difficult to eliminate by itself, which will greatly affect the thermal conductivity of the kiln brick inside the cement kiln,.The change of the thermal conductivity will reduce the heat dissipation of the kiln brick and affect the production efficiency.
1.4 Corrosion of kiln bricks
As the raw material used for produce cement is alkaline, under the high temperature, the weak alkali base molecules in the raw material will accelerate the ionization, thereby gradually increasing the alkalinity, resulting in a serious corrosion problem of kiln bricks.Under long-term corrosion, the properties of kiln bricks will change, leading to irreversible changes in their thermal stability, which greatly accelerates the aging process of cement kiln walls.
Based on the above problems, new applications of cement kiln refractories can help increase the service life of cement kilns
With the continuous improvement of the technology of refractories, the service life and operation efficiency of cement kiln can be greatly improved by improving the refractories used for the cement kiln.
2.1 The updated silicon mullite brick
In recent years, by adding zirconium sand and other crystals into the silicon mullite brick, the thermal shock resistance of the cement kiln can be greatly improved, which can help to improve the service life and production efficiency of the cement kiln.Cunse silicon mullite brick is made by high pressure forming and special firing process. It has strong wear resistance and high corrosion resistance, and is an ideal inner lining material for transition belt.
2.2 Chromium-free magnesia alumina kiln brick
The chromation-free treatment of cement kiln can greatly improve the stability of cement kiln.Magnesia aluminum zirconium brick is a new material which has been developed in recent years. Magnesia aluminum zirconium bricks are made by mixing a certain amount of zirconium aluminate and adding corresponding solvents to combine alumina with magnesium during the firing process to form a spar. After a series of industrialization steps, a new type of heat-resistant kiln brick material is formed. This product has strong high temperature and abrasion resistance.
2.3 Application of ceramic fiberboard
Ceramic fiberboard made by blending and processing ceramic fibers, organic reagents and related ingredients can effectively solve the problems of cracks caused by high temperature shrinkage.Ceramic fiber has its advantages in structure.The phenomenon of expansion of conventional materials at high temperature is not obvious in fiber materials, and fiber shrinkage will not produce cracks.At the same time, because there is a dense protective layer on the surface of fibreboard , it is difficult to deposit the dust produced in the process of cement production. Therefore, the problem of excessively high temperature of the material caused by long-term ash accumulation can be solved, and the life of the material is greatly increased.
Cunse continues to carry out professional research, to provide the cement industry with better quality products to improve the production efficiency and service life of cement kiln, and finally achieve the efficient production of cement industry.
