Technical characteristics and practice of Angang's electric furnace transformation and resumption of production
Electric furnace short process steelmaking with its green low-carbon,ecological environmental protec-tion,energy saving and low consumption and other advantages,has become an important way to achieve the"carbon peak","carbon neutral"development strategy in China's iron and steel industry.Since 2017,China's scrap steel resources have entered a virtuous cycle stage,and at the same time,the environmental protection discharge pressure of BF-converter long process steelmaking process is increasing day by day,so it is necessary to optimize the short-process steel making technology of electric furnace with scrap as the main raw material.Angang has resumed produc-tion of 100 t finger valve shaft electric furnace that has been out of production for many years.The article introduces the technical features and production practices of the 100 t electric furnace resumption and transformation at Angang,and discusses the new achievements and trends in domestic electric furnace steelmaking technology through engineer-ing practices.After renovation,the 100 t electric furnace of Angang has been changed from a traditional vertical fin-ger bracket arc furnace to eccentric bottom tapping electric arc furnace.Adopting single arm furnace cover and elec-trode lifting and rotation technology,robot temperature measurement and sampling technology,continuous iron blending technology on the tapping side,multifunctional hydrogen oxygen furnace wall gun+bottom blowing com-posite blowing technology,automatic sand filling technology,efficient flue gas waste heat recovery technology,a secondary system with cost optimization,advanced primary electrical control technology,slag discharge from the fur-nace bottom holding tank truck,four hole+dog house+fully enclosed green and environmentally friendly dust removal technology.Under the conditions of 50％scrap steel and 50％molten iron raw materials,the team achieved good technical indicators.The average smelting cycle was 32 minutes,electricity consumption was 178.46 kW·h/t,electrode consumption was 0.866 kg/t,oxygen consumption was 34.82 m3/t,coke oven gas consumption was 8.16 m3/t,and steam recovery was 150 kg/t.The refurbished electric furnace,compared to the existing new furnace type elec-tric furnace Consteel and ECOARC,the production level of the new type electric furnace can be reached in the key production indexes such as smelting cycle and power consumption per ton of steel by optimizing the process organiza-tion ability.
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