DEM simulation analysis on blast furnace burden surface shape considering gas flow factor
XU Hao1, WANG Yi-ci1, YAN Bing-ji2, LI Chuan-hui3, GUO Hong-wei2
1. College of Materials and Metallurgy, Inner Mongolia University of Science and Technology, Baotou 014010, Nei Mongol, China; 2. School of Iron and Steel, Soochow University, Suzhou 215131, Jiangsu, China; 3. Technology Center, Shandong Tianming Heavy Industry Technology Co., Ltd., Jinan 271100, Shandong, China
Abstract：With the rapid development of computer hardware and software technology, the discrete element method (DEM) has been widely used for simulating blast furnace burden distribution, while its efficient and accurate calculation model has been accepted by domestic and foreign scholars. The influence of gas flow factor on burden surface was simulated by discrete element method, and the effect of gas flow factor was equivalent to the increase of friction coefficient based on mechanical analysis. The results show that there is an increase in size for inner and outer stack angles of coke burden surface after considering gas flow factor, and the increase extent in inner stack angle is larger than the increase in outer stack angle. The width of platform and the depth of hopper for burden surface also increase in varying degrees. Not only of ore but also of coke, the simulation result is closer to the practical data after considering the gas flow factor. Besides, gas flow factor also has some influence on particle size distribution, within the scope of 1.0 m from the center of furnace throat, the mass percent of 10 mm ore decreases, while that of 17 mm and 32 mm ore increases. Porosity near the hearth increases, and the ratio of ore to coke in the range of 0.85-1.80 m around the center also increases slightly, while the ratio decreases in the range of 1.80-3.45 m around the center.
Mio H, Narita Y, Nakano K, et al. Validation of the burden distribution of the 1/3-scale of a blast furnace simulated by the discrete element method[J]. Processes, 2020, 8(1): 6.
ZHAO G L, CHENG S, XU W X, et al. Comprehensive mathematical model for particle flow and circumferential burden distribution in charging process of bell-less top blast furnace with parallel hoppers[J]. ISIJ International, 2015, 55(12): 2566.
[9]
Park J I, Jung H J, Han J W, et al. Mathematical modeling of the burden distribution in the blast furnace shaft[J]. Metals and Materials International, 2011, 17(3): 485.
Masahiro Y, Akito K, Rikizo T, et al. Gas permeability improvement mechanism at the blast furnace cohesive zone by mixed coke charging in ore layer and effect of coke mixing for different cohesive zone condition on gas permeability[J]. ISIJ International, 2020, 60(7): 1438.
[20]
Siahaan Andrey S, Yoshihiko O, Hideki K, et al. Numerical simulation on phenomena of fine particles passing through an orifice under gas flow condition[J]. ISIJ International, 2020, 60(7): 1528.
[21]
Yoichi N, Hiroshi M, Takashi O, et al. DEM analysis of particle trajectory in circumferential direction at bell-less top[J]. ISIJ International, 2017, 57(3): 429.
2023, Vol. 33 
