Process

Limestone is heated to around 900 degrees Celsius by the 1150 degree Celsius kiln flue gas in the preheater, and then pushed into the rotary kiln through a hydraulic push rod. Limestone is roasted and decomposed into CaO and CO2 in the rotary kiln. After decomposition, limestone is generated and enters the cooler, where it is cooled to below 100 degrees Celsius by the cold air blown in and discharged. The 600 degree Celsius hot air that has undergone heat exchange enters the kiln and mixes with coal gas for combustion. The exhaust gas is then mixed with cold air and enters the bag filter through the induced draft fan. It is then discharged into the chimney through the exhaust fan. The limestone discharged from the cooler is fed into the limestone storage warehouse through a vibrating feeder, a chain bucket conveyor, a bucket elevator, and a belt conveyor The vertical preheater and vertical cooler lime rotary kiln are active lime calcination equipment developed by introducing and digesting advanced foreign technology. The technical characteristics of the active lime production line are: 1. The structure is advanced, and the vertical preheater effectively improves the preheating effect. After preheating, the decomposition rate of limestone entering the kiln can reach 20-25%, and 10-15mm fine-grained limestone can be directly utilized 2. The two ends of the rotary kiln are sealed with composite scales, with an air leakage coefficient of less than 10%, reducing radiation heat loss 3. Circular or square vertical cooler, with a lime temperature of 800C+ambient temperature for easy transportation and storage. It can preheat the secondary air entering the kiln to above 7000C, reducing the need for moving parts and special materials.

Technical Parameter