The working principle of a lime kiln is to calcine raw materials such as limestone at high temperatures to obtain lime. Generally, the operating temperature of a lime kiln is above 900℃. The kiln body is divided into two parts: a lower section, typically a preheating zone, and an upper section, the calcination zone.
Inside the lime kiln, the limestone and other raw materials gradually decompose after heating, releasing carbon dioxide and other gases. As the calcination temperature increases, the calcium carbonate in the raw materials decomposes into calcium oxide and carbon dioxide. Calcium oxide becomes the main product, which is collected and sent for subsequent processing and use.
During the calcination of limestone, factors such as temperature, limestone particle size, calcination time, and degree of calcination affect the quality and yield of lime.
Direct heating method: This method involves directly heating the limestone and other raw materials by burning fuel inside the lime kiln.
Indirect heating method: This method uses external combustion equipment to heat the raw materials through the outer wall of the kiln, utilizing the heat generated by fuel combustion.
Gas heating method: This method introduces flue gas or other gases produced by fuel combustion into the lime kiln to heat the limestone and other raw materials.
