BLAST FURNACE BURDEN STRUCTURE UNDER DIFFERENT BLOCK ORE RATIOS
In order to achieve economic,high production,and high quality of blast furnaces,a steel enterprise in Xingtai has adopted the process measure of enriched oxygen and large injection.Based on the raw material and fuel conditions at the blast furnace site,the effects of adjusting the amount of acidic furnace materials such as lump ore and pellet ore on reducing the position of the soft melt zone,improving the permeability of the material column,increasing the permeability index and gas utilization rate of the blast furnace were studied under the condition of low sintering ore ratio.The research results show that when the structure of the furnace material is sintered ore+pellet ore+South African ore,as the proportion of South African blocks increases,the position of the soft melt zone moves upward,the drop temperature increases,the maximum pressure difference and characteristic value increase,and the permeability of the material column decreases.In addition,South African blocks have higher alkali metals,which are prone to damage the coke structure.Therefore,when South African blocks are used for a long time,the addition ratio should not exceed 8％.When the ratio of sintered ore and pellet ore to the furnace is constant,Newman block and SP10 are gradually used to replace South African block.When the ratio of South African block to Newman block is 1∶1,the maximum pressure difference and characteristic value are the lowest,and the best permeability of the material column is 868 kPa ℃,which is suitable for both South African block and Newman block to be 10％.As the replacement ratio of SP10 ore increases,the range of soft melt zone becomes wider,and the maximum pressure difference and characteristic value both significantly increase,leading to a deterioration of the droplet performance of the furnace material.Due to the poor burst performance of SP10,it is easy to produce a large amount of powder,which further leads to a deterioration of the permeability of the material column.Therefore,SP10 is not easy to exceed 6％.
blast furnacefurnace material structureblock oresoft melt zonedroplet performance
万方数据
维普
