Analysis on key process and technology of blast furnace ironmaking on high charging proportion of pellet ore
The high charging proportion of pellet operating in blast furnace can significantly improve the agglomera-tion proportion and ferrous content grade of burden,reduce the slag volume and fuel consumption,and greatly reduce the CO2 emission of ironmaking process,which is an important technical approach to realize the green and low carbon of blast furnace ironmaking.The change of the burden distribution,movement behavior and the rules under the condition of large change in the high pellet charging proportion are researched and investigated.Through the simulation of the discrete element method,the characteristics of the distribution and descending motion of the burden are analysed and obtained under the condition of the pellet proportion increasing.According to the reaction characteristics of the pellet reduction process,the mechanism and control mechanism of reducing expansion in the pellet reduction process are analyzed.The change and rule of blast furnace permeability after the increase of pellet charging proportion are calculated and discussed theoretically.In order to adapt to the conditions of the high pellet charging proportion operating,the blast furnace internal profile parameters are optimized to adapt to the process char-acteristics of high pellet charging proportion operating.Experimental determination and study the conditions of differ-ent pellet charging proportion,the synthesis of burden softening and melting parameters change and rule.When the burden structure of high alkalinity sintering,alkaline pellet,acidic pellet and lump ore is adopted,the high tempera-ture softening and melting performance parameters of the integrated burden are optimized,and the resistance loss in the cohesive zone is decreased,which creates favorable conditions for the stable and smooth of blast furnace opera-tion.Combined with the production practice of super large blast furnace,the key technologies for high pellet charg-ing proportion operating are developed.The comprehensive technical measures are adopted,such as the burden dis-tribution accurate control technology,oxygen enrichment with pulverized coal injection,and increasing the top pres-sure,the pellet charging proportion of Shougang Jingtang's blast furnaces reaches 55%,the significant high effi-ciency and low-carbon production and operation performance are achieved.
blast furnaceironmakingpellet oresmeltinglow carboncohesive zoneburden distribution
NETL
NSTL
万方数据
