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| Design and production practice of blast furnace system for high proportion pellet smelting |
| WANG Xin-dong |
| HBIS Group Co., Ltd., Shijiazhuang 050023, Hebei, China |
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Abstract At present, China's iron and steel industry is facing multiple pressures such as energy conservation, emission reduction and green development, showing a new form of reduction and innovative development. Before the major breakthrough and large-scale application of non blast furnace ironmaking key technologies, the blast furnace based ironmaking process will remain the dominant position for a period of time. High proportion pellet smelting is the development direction of blast furnace ironmaking in China at present, and it is the inevitable trend for the iron and steel industry to reduce pollution and carbon in the future. In order to further promote the research and development and application of high-proportion pellet technology, starting from the physical and chemical characteristics of pellet, the behavior of pellet in blast furnace was clarified, the factors that restrict the increase of pellet proportion was analyzed, the development direction of blast furnace system design for high-proportion pellet smelting in the future from metallurgical reaction mechanism to engineering practice was summarized, and taking low-carbon green as the premise, resources and energy utilization as the basis Blast furnace design concept supported by intelligent equipment was put forward. By comparing and analyzing various blast furnace types, cooling systems, hearth and bottom design schemes at home and abroad, the advantages of multi-stage furnace body, all cast iron cooling staves, and bell less top of cascade tank in high-proportion pellet smelting are emphatically analyzed. The technical characteristics of ore coke tank, hot blast stove, automatic detection and model control are summarized, and the design suggestions of blast furnace system suitable for high-proportion pellet smelting are given. According to the reaction mechanism of pellet in blast furnace and the influence of operation furnace type on strengthening smelting, the determination method of reasonable charge structure, the best control standard of charge alkalinity, and the operation systems of charging, air supply, tapping, heat, slag, etc were put forward. Finally, through the practice of blast furnace smelting, the progress of technical and economic indicators of high proportion pellet smelting is verified, which lays a foundation for the design and optimization of blast furnace system of high proportion pellet smelting in blast furnace in the future.
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Received: 26 June 2022
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2022, Vol. 57 
