The ash vertical kiln is an important equipment for calcining limestone to produce lime, and its calcination process contains rich professional knowledge.
Principle of calcination
The main component of limestone is calcium carbonate (CaCO3). Under high temperature conditions, calcium carbonate undergoes a decomposition reaction, producing calcium oxide (CaO, also known as lime) and carbon dioxide (CO ₂). This process is the core principle of lime vertical kiln calcination.
Equipment structure
Lime vertical kiln is usually composed of kiln body, feeding system, discharging system, air supply system and other parts. The kiln body is the main place for calcining limestone, generally a circular or square vertical structure; The feeding system is responsible for uniformly adding limestone into the kiln; The discharge system discharges the calcined lime; The air supply system provides necessary oxygen for calcination to ensure the progress of combustion reactions.
process control
Temperature control during the calcination process is crucial. Low temperature, incomplete decomposition of calcium carbonate, and poor quality of lime; Excessive temperature not only wastes energy, but may also lead to overburning of lime, affecting its activity. At the same time, it is necessary to control the air supply reasonably to ensure that the fuel is fully burned and provide sufficient heat for the calcination reaction.
Product quality impact
Factors such as calcination temperature, time, and limestone particle size can all affect the quality of lime. The appropriate calcination temperature and uniform calcination atmosphere are the key to ensuring the quality of lime. If the calcination temperature is insufficient, incomplete decomposition of limestone can lead to the phenomenon of green burning (incomplete decomposition) or over burning (local sintering) in lime, affecting the activity and quality stability of lime.
Lime vertical kiln calcination is a complex process that requires comprehensive consideration of various factors such as raw material quality, equipment operation, and process parameters in order to achieve efficient and stable production.
