Innovation and practice for direct reduction process with COG zero reforming of Zhang Xuan Tech
In recent years,the total steel production of China is about 1 billion t/a,and annual carbon emissions have reached 2 billion t,accounting for 15％of the total yearly carbon emissions of China,as is the industry with the highest carbon emissions in 31 manufacturing categories.Under the background of the national"Carbon neutrality"strategy,the low-carbon-production transformation and upgrading of the steel industry is imminent.Zhang Xuan Tech of HBIS firmly implements the national development strategy,takes the lead in closing the original blast fur-nace basis ironmaking equipment while building the world's first COG basis zero reformer direct reduction plant(DRP),with an annual output of 1.2 million t of cold direct reduced iron(CDRI).The construction of this plant was completed in December 2022,and stable continuous production was achieved in May 2023.In the initial stage of production,some problems were exposed in the heating furnace system,gas compressor system,water treatment system,etc.Although these problems did not affect normal production,they limited the further improvement of the plant's performance.In addition,the quality requirements for pellets in hydrogen-basis shaft furnaces far exceed expectations,such as the compression strength and other properties are insufficient,resulting in a higher DRI crush-ing rate and higher fines content in the DRI product during the initial production stage.Through in-depth analysis of the problems and continuous improvement and optimization of the process and equipment,great improvement has been gained in technical and economic indicators such as COG gas consumption and DRI metallization rate,which are even better than the design rate.Compared with the traditional blast furnace ironmaking plant,our new DRP has gained these achievement,CO2 emissions are reduced by more than 70％,SO2 emissions are reduced by more than 30％,NOx emissions are reduced by more than 70％,dust emissions are reduced by more than 80％.The success of this plant represents a alternative road for the steel industry in China,and also marks the subversive,demonstrative and key footprint in the transformation of China's steel industry from traditional"carbon metallurgy"to a new type of"hydrogen metallurgy",which will further lead the transformation of traditional iron and steel metallurgy process and fully open a new era of green and low-carbon development.
transformation and upgradingzero reformingdirect reductionhydrogen metallurgytechnical and economic indicatorequipment modification
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