Calcination process of mixed fired lime vertical kiln
The mixed fired lime vertical kiln is a common lime production equipment, and its calcination process has a significant impact on the quality and production efficiency of lime.
This process is mainly based on the thermal decomposition reaction of limestone at high temperatures. Firstly, the raw limestone needs to undergo pretreatment such as crushing and screening to remove impurities and ensure uniform particle size that meets calcination requirements. At the same time, prepare suitable fuels such as coal, coke, etc., and control their particle size to match the limestone.
Mix the pre treated limestone and fuel in a certain proportion, and evenly add them into the kiln through the kiln top loading equipment. In the kiln, materials move from top to bottom, passing through the preheating zone, calcination zone, and cooling zone in sequence. In the pre tropical zone, limestone absorbs the rising heat from the kiln, and the temperature gradually increases; The calcination zone is the core area, with a temperature controlled between 1000 ℃ and 1200 ℃, where limestone decomposes into calcium oxide and carbon dioxide; In the cooling zone, the calcined lime undergoes heat exchange with cold air, resulting in a decrease in temperature.
During the calcination process, it is necessary to adjust the air volume and pressure through ventilation devices, control the combustion and heat transfer processes, and ensure the calcination effect. After calcination is completed, the lime is discharged from the bottom of the kiln for subsequent treatment.
