Causes and Control of Low Temperature Stock Slipping in Shagang No.2 BF
Shagang No.2 BF steps to its last stage of campaign,and the furnace condition fluctuates frequently with stock slipping at low-temperature.After studying the existing production operation data of the furnace,it is believed that the main reason for the stock slipping at low temperature falls on shortening of distance from the root of the cohesive zone to the dead-man as a result of the fast lowering of the stock at the furnace edge and widening of the dead man.When the[Si]content of the hot metal is less than the lower limit of the standard one(0.40％-0.45％)for a long time(4-8h),and drops greatly(≥0.2％),stock slipping may occur.Based on the moving model of cohesive zone-the deadman,the following actions are taken:enlarging the ore batch from 65.3 t/h to 67.3 t/h,decreasing the stock charging speed from 6.78 batches/h to 6.60 batches/h,reducing the central coke proportion from 25％to 20％,and lessening the number of ore distribution rings at the furnace edge from 6 to 5.Thanks to the above actions,the frequence of stock slipping at lower temperature is reduced from 5 times/month to 2 times/month,showing an impressive control effect.
blast furnacestock slipping at low temperaturecohesive zonedeadman[Si]content in hot metal
万方数据
维普
