DEM simulation of sinter distribution in vertical cooling furnace
QI Teng-fei1, HUANG Jun2, SUN Jun-jie3, ZAHNG Yong-jie1,4
1. School of Metallurgy, Northeastern University, Shenyang 110819, Liaoning, China; 2. School of Energy and Environment, Inner Mongolia University of Science and Technology, Baotou 014010, Nei Mongol, China; 3. Technology Center, Shanghai Meishan Iron and Steel Co., Ltd., Nanjing 210039, Jiangsu, China; 4. Central Research Institute, Baosteel Co., Ltd., Shanghai 201900,China
Abstract：In order to study the permeability of sinter in vertical cooling furnace and improve the distribution of cooling gas, the slot model of single bin for vertical cooling furnace in Meigang was established. The charge and discharge process were simulated by discrete element method. Sinter and its porosity distribution in the vertical cooling furnace under steady-state conditions were obtained. The results show that during charging, the segregation distribution of sinter will occur due to the change of landing point. When the sinter flow is stable, there are three flow regions in the furnace cavity, quasi stationary region, mass flow region and convergent flow region. In terms of sinter distribution, the central area of furnace cavity contains more particles of 10-25 mm and 25-40 mm. More particles of 40-80 mm and 80-150 mm are distributed in the middle area. In the middle and upper part of the sidewall area, the mass fraction of 25-40 mm and 40-80 mm particles are higher, while the mass fraction of 80-150 mm particles in the lower part is higher. Such sinter distribution causes large particle segregation in the sidewall area and middle area of the furnace cavity, and small particle segregation in the center area. The porosity is distributed as "U" with larger in sidewall as well as central area, and smaller in middle area. Sinter in the sidewall area has the best air permeability, resulting in the easy escape of cooling gas from the sidewall area. In order to improve the distribution of cooling gas in the furnace, further research could be carried out from reducing the sinter size range and developing a new charge device.
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2022, Vol. 32 
