Segregation of sinter particles in sinter shaft cooler
SUN Jun-jie1, ZHANG Yong-jie2, XU Ji3
1. Technology Center, Shanghai Meishan Iron and Steel Co., Ltd., Nanjing 210039, Jiangsu, China; 2. Central Research Institute, Baosteel Co., Ltd., Shanghai 201900, China; 3. State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
Abstract：The process of recycling the sensible heat of sinter by using a sinter shaft cooler is a new technology. The shaft cooler is a typical powder bed with gas-solid countercurrent heat transfer. Considering environmental protection and energy conservation, the process of sinter shaft cooler was introduced into Meishan Steel to replace the traditional ring cooler. Focusing on the segregation of particles in the surge bunker and the furnace, the DEM (Discrete Element Method) is used to study how to decrease the first segregation and the secondary segregation on an industrial scale. The result of the simulation indicates two conclusions. Firstly, the particle pit is formed in the center region of surge bunker after adding a plate for separating the particles and the particle size in the pit is bigger than other regions. This phenomenon can decrease the first segregation. Secondly, the landing position in the furnace can be controlled in a beneficial direction after adding a shunt on the bottom of the feeding pipe and the purpose of decreasing the secondary segregation can be achieved. In addition, the behavior of secondary segregation can be further optimized by adjusting the tilt angle of the shunt.
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2020, Vol. 55 
