Because the vertical mill operation rate is not high, the material level of the homogenization reservoir is always very low, and the raw material composition in the kiln fluctuates greatly. The flame has to be constantly adjusted, resulting in a large change in the burning zone of the kiln, especially in the case of a fan inlet throttle. The vibration of the fan is damaged, causing the throttle to run out of control, which causes the burner flame to elongate. Under strong calcination conditions, the kiln skin is eroded. Analysis of exfoliated brick samples showed that the bricks had infiltration, which may be caused by the melting of the low viscosity clinker. The kiln skin is extremely dense and lava-like, and obvious recrystallization is also found in the sample, which indicates that the heat load is very high here, alternating flaking of the kiln skin and penetration of the clinker are the causes of the spalling of the hot surface of the brick.
Only the bricks with the weakest part of the firing zone are replaced. Because there is no spare alkaline brick, the kiln enters normal production from the commissioning period, and the kiln operation is stable and the operation rate is at. In the operation, various measures were taken to complete the growth of the kiln skin in the firing zone. The length of the kiln skin reached the kiln mouth. The imported high-alumina bricks, domestic high-alumina bricks and clay bricks were in good condition and need not be replaced. Based on this, reasonable brick allocation and kiln brick allocation were carried out at the same time.
When used in the stable kiln area, due to its firm and dense protection, harmful ingredients cannot penetrate into the brick and usually have a good effect; when used in an unstable kiln area, due to its sulphur-rich and chlorine-rich The original fuel composition is not very adaptable and easily eroded and destroyed, but the dolomite brick has a good resistance to alkali. Magnesia spinel brick has stable performance, good thermal shock resistance and thermodynamic elasticity, and strong anti-corrosion ability. In the area of ​​kiln skin instability or excess sulfur, magnesium spinel brick is the most suitable brick species, but the price is high. From a development perspective, magnesium chrome bricks will increasingly be replaced by chromium-free refractories. As a factory, it is always trying to find the most economical kiln lining that suits its specific conditions, but this must be obtained after a long period of groping. The preferred method is to enter the kiln to check the condition of the brick and kiln skin after each kiln is stopped. The kiln skin and peeled brick samples are used for chemical analysis. After a long period of accumulation, the use status and damage of the brick can be known. Reasons and find the most suitable kiln lining.
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