What are the causes of nodulation in lime kiln shaft kiln
In the production process of lime kiln shaft kiln, the problem of nodulation is often encountered. Nodulation will not only affect the quality and production efficiency of lime, but also cause serious wear and corrosion to the kiln body and shorten the service life of the equipment. So, what are the reasons for the nodulation of lime kiln shaft kiln?
Impurities in raw materials are an important factor leading to nodulation. If the limestone raw material contains excessive oxide impurities such as silicon and aluminum, these impurities will react with calcium carbonate to form low melting point compounds during the calcination process. These compounds will accumulate and gradually grow in the kiln, and finally form nodules.
The operation factors also have an important impact on the nodulation. The skill level and operating habits of operators directly affect the uniformity of temperature distribution in the kiln. For example, too fast feeding speed, uneven distribution of materials, improper adjustment of air volume, etc. may lead to uneven temperature distribution in the kiln, thus promoting the formation of nodules.
Equipment factor can not be ignored. Poor sealing of the kiln body, wear of refractory materials and blockage of the hood will affect the heat distribution and air flow in the kiln, and then lead to the formation of nodules. In addition, if the fuel is too concentrated and the calcination temperature is too high, it will also form nodules if it exceeds the melting temperature of calcium carbonate.
Too much heat input and too long calcination time are also one of the reasons for nodulation. This will make it easier for the low melting point substances in the kiln materials to reach the liquid state and bond between the kiln wall or materials, forming nodules.
The main causes of nodulation in lime kiln shaft kiln include impurities in raw materials, improper operation, equipment problems and excessive heat input. In order to avoid the occurrence of nodulation, the manufacturer should strictly control the quality of raw materials, improve the skill level of operators, strengthen equipment maintenance and overhaul, and reasonably control the heat input and calcination time. Only in this way can we ensure the stable operation of lime kiln shaft kiln and the high quality and high yield of lime products.
