What is the reason for the full kiln fire in the lime kiln
During the production and operation of lime kilns, there may sometimes be a phenomenon of full kiln fire, which not only affects production efficiency but may also pose certain hidden dangers to equipment and production safety. The full kiln fire in lime kilns is usually caused by the following main reasons.
1、 Too much coal is added, and the air blowing volume is too high. The normal operation of a lime kiln requires proper coordination between coal and air blowing. When the amount of coal added exceeds a reasonable range, excessive coal burning in the kiln will release a large amount of heat. At the same time, if the amount of air blown is too large, it will be like adding fuel to the fire, making the combustion process extremely intense. Excessive air provides more oxygen for combustion, promoting faster and more complete combustion of coal, resulting in flames far exceeding normal levels. These strong flames spread wildly inside the kiln, which can easily lead to a full kiln fire and disrupt the normal thermal environment of the entire lime kiln.
2、 Long term no ash discharge, the amount of ash discharge is too small. The lime in the lime kiln needs to be discharged in a timely manner after calcination to maintain material balance and heat exchange balance in the kiln. If there is no ash production for a long time or the amount of ash produced is too small, the already calcined lime in the kiln will continue to accumulate. As the accumulation increases, the effective space inside the kiln is gradually compressed, and the combustion area is also squeezed accordingly. This makes it impossible for the flame to spread along the normal path and space, and then gather and rise in a limited space, ultimately causing the phenomenon of full kiln fire and hindering the stable production of the lime kiln.
3、 Coal powder leaked from the kiln. The particles of fine coal are relatively small, and compared to other forms of coal, their distribution and state in the kiln are more difficult to control. When using pulverized coal, during the operation of the kiln, some of the pulverized coal may leak down from the upper gaps and other parts of the kiln. Once these leaked coal powders meet suitable conditions, such as encountering hot gases, oxygen, etc. inside the kiln, they will start burning in the upper area of the kiln, forming flames that leak from the top of the kiln. Moreover, once this type of fire leakage occurs, it often gradually spreads and expands, resulting in a situation where the entire kiln is filled with fire, which greatly interferes with the normal operation of the lime kiln.
Understanding these common reasons for full kiln fire in lime kilns is crucial for lime kiln operators and managers. Only by accurately identifying and taking targeted measures, such as reasonable control of coal and air volume, timely ash discharge, and careful selection of suitable coal types, can the occurrence of full kiln fire be effectively avoided, ensuring the efficient, safe, and stable operation of lime kilns and ensuring the smooth progress of lime production.
