Numerical simulation for segregation behavior of pulverized coal and flux mixed injection pipeline
WANG Kai1,2, HE Xiao-xia3, ZHAO Man-xiang4, ZHANG Jian-liang1, JIA Guo-li5, XU Run-sheng1
1. School of Metallurgy and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China; 2. Beijing Shougang Co., Ltd., Beijing 100041, China; 3. State Key Laboratory of Advanced Iron and Steel Metallurgy Technology, University of Science and Technology Beijing, Beijing 100083, China; 4. Qianshun Technology Center, Beijing Shougang Co., Ltd., 100041, China; 5. Ironmaking Operation Department, Beijing Shougang Co., Ltd., Beijing 100041, China
Abstract：In order to explore the segregation behavior for mixed injection of pulverized coal and flux in blast furnace, the pulverized coal and flux were sampled and tested, and the industrial analysis results and elemental analysis results of pulverized coal were obtained, as well as the composition detection results of pulverized coal and flux. On this basis, Fluent software was used to numerically simulate and analyze the sedimentation law of different particles during the mixed injection and conveying process of pulverized coal and flux, and the effects of flux addition, carrier gas velocity and pipeline length on segregation were analyzed. The results show that the flux addition has little effect on the segregation. With the increase of carrier gas velocity, the degree of segregation gradually decreases. The longer the pipeline, the more pulverized coal is affected by segregation. Therefore, increasing the carrier gas velocity helps to suppress segregation. Excessive pipe length will not only increase the degree of particles sedimentation, but also increase the influence of segregation. The research results can provide guidance for the application of pulverized coal and flux mixed injection technology.
GAO Qiang-jian,ZHANG Guo-peng,ZHENG Hai-yan,et al. Combustion performance of pulverized coal and corresponding kinetics study after adding the additives of Fe2O3 and CaO[J]. International Journal of Minerals,Metallurgy and Materials,2022,30(2):314.
[10]
YANG S,SUN Y,ZHANG L,et al. Impact of granular segregation on the solid residence time and active-passive exchange in a rotating drum[J]. Chemical Engineering Science,2017,173:287.
CAI Jia-liang,XU Jiang,YOU Ming-hao,et al. Flow characteristics and pattern transition of different pipe diameters in pneumatic conveying for gasifier[J]. Chemical Engineering Research and Design,2023,189:282.
2023, Vol. 33 
