This article explains why heat loss occurs in rotary kiln? The environment of the rotary kiln during the calcination process is not good, the temperature is too hot, the rotary kiln equipment will encounter unstable thermal shock at any time, and the temperature will change more frequently due to thermal fatigue. These are the reasons for the thermal damage of the kiln lining. The manufacturer Henan Hongxing Machine took everyone to analyze several reasons for thermal damage of rotary kiln.
The thermal load in the rotary kiln is too high, the load softens above the temperature, and the kiln skin cannot form. The brick face has lost kiln skin protection for a long time, the eutectic impurities of the bricks melt at high temperature, and the migration direction of the cold front layer is dense, and the porous surface is loose and porous. Loose porous thermal coats do not wear brushes, are subject to collision and impact and thermal fatigue, and are easily damaged.
2. Thermal shock
The kiln skin is unstable and the kiln operation is abnormal, and the bricks are especially vulnerable to thermal shock and damage. The kiln skin suddenly collapsed, causing the surface temperature of the brick to soar instantly, even nearly a thousand degrees, and the kiln was frequently opened and stopped to generate the thermal stress frequently in the brick. There is a certain limit to the heat stress absorption capacity inside the brick. Once it exceeds its structural strength, the brick boom and the weakened structure continue to expand and deepen, causing the brick to smash. The kiln skin disappears on the hot surface of the rubble chip, causing continuous damage to the brick.
3. Thermal fatigue
A layer of material that reduces the surface temperature of the kiln lining of a rotating combined rotary kiln and the exposed flame temperature. If the kiln is 2 revolutions per minute, this periodic temperature rises to 90,000 times per month. The range of each elevator is only 150-200 ° C, and the depth of influence is only 15- and ram, but after repeated thermal fatigue on the surface of the hot brick, thermal fatigue occurs on the surface of the brick, which is then combined with other destructive factors and pushes the brick to peel and damage.
Rotary kiln: http://www.hxqmj.cn/2.html