Practice and prospect of CISDI green electric arc furnace
Electric Arc Furnace(EAF)steelmaking has the characteristics of short process,low energy consumption and carbon emissions,and is an important driving force for the world's steel industry to achieve sustainable develop-ment.CISDI has conducted a series of research on electric furnace process theory,core equipment,intelligent con-trol,and other aspects.Through technical research and development and pilot experiments,multiple green and effi-cient electric furnace steelmaking technologies have been developed,which focus on high efficiency,low-carbon,low energy consumption,and environmental friendliness.Among them,the high-efficiency scrap steel transportation tech-nology can achieve an average scrap steel transportation speed of over 7 m/min;step rolling scrap preheating technol-ogy,increasing the preheating temperature of scrap by 70-100 ℃;IGBT flexible DC power supply,the power factor of the electric furnace can reach 0.97 or above;short network design optimization system to control three-phase impedance imbalance within 3％;intelligent electrode adjustment technology,with current fluctuations of less than 33％and 14％during the drilling and melting periods,respectively;the dioxin treatment technology can control the concentration of dioxin emissions from arc furnace flue gas to within 0.1 ng/m3;Efficient waste heat recovery sys-tem,with a steam recovery capacity of over 160 kg per ton of steel.Intelligent auxiliary equipments have been inde-pendently designed,such as automatic sand filling at the tapping hole,automatic cleaning of the furnace door,and automatic temperature measurement and sampling robots,which improved the intrinsic safety level of the enterprise.Engineering practice has proven that using CISDI's green EAF technology,the tap to tap time is 30 minutes and the power consumption is 300 kW·h per liquid steel,which helps to promote the green development of the steel indus-try.At the same time,the future development of electric arc furnace steelmaking technology is discussed,with the consumption of low-grade DRI as the main process route for the future development of electric arc furnace steelmak-ing,the production of high-quality steel as the most important research direction for the development of electric arc furnace steelmaking,and the use of digital smelting as the most effective means of electric arc furnace steelmaking production,contributing to the low-carbon transformation of the steel industry.
electric arc furnacecontinuous scrap chargingIGBT flexible DC power supplyelectrode adjustmentdigital intelligence smelting
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