Simulation study of burden distribution under different burden distribution systems based on discrete element method
The burden distribution process is a key part of blast furnace operation,affecting the gas flow distribution inside the furnace.Particulate matter such as coke and iron-bearing material of blast furnace were studied by the discrete element method,and the burden distribution and the mass ratio of ore to coke in the two distribution modes of"center coking"and"platform+funnel"were analyzed.The results show that under both distribution modes,a central coke column is formed;the diameter of the coke column formed in the"platform+funnel"pattern(1.6 m)is approximately half of that in the"central addition of coke"pattern(3 m);in the"platform+funnel"pattern,the quality ratio of ore and coke at the edge of the blast furnace is 0.75-2.55 lower than that in the"central addition of coke"pattern,which not only ensures the development of the center airflow but also promotes the development of the edge airflow,resulting in higher gas utilization rate.The height change of the position of the soft melt zone will affect the distribution of ore and coke,the higher the position of the soft melt zone,the greater the mass ratio of ore and coke at the edge of the blast furnace,it may cause poor airflow at the edge of the blast furnace,thereby affecting the overall gas utilization rate of the blast furnace.
blast furnaceburden distribution systemcenter coke chargingplatform-funnelore/coke ratio
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