DISCUSSION AND ANALYSIS OF LOW-CARBON IRONMAKING TECHNOLOGY
This article analyzes and discusses the application prospects of hydrogen rich carbon circulating oxygen blast furnace technology and hydrogen based vertical furnace direct reduction technology from the perspective of carbon reduction potential.The theoretical limit for reducing carbon emissions in long process low-carbon smelting technology,represented by hydrogen rich carbon cycle oxygen blast furnace technology,is about 50％,which helps China's steel industry achieve significant carbon reduction effects at the current stage.The vertical furnace process using hydrogen rich gas as a reducing agent has the ability to further increase the hydrogen gas ratio at the technical level,and can even increase the hydrogen gas ratio to 100％.Through mechanism analysis of chemical reactions,reaction thermodynamics,and reaction kinetics,the essential reasons for the selection of different parameters in MIDREX and ENERGY processes were explored.At the same time of reducing gas phase,the H2/CO in the vertical furnace gas of MIDREX process and ENERGY process is different,which is determined by the different reforming methods.The higher the H2/CO,the more suitable it is for hydrogen metallurgy;The higher the pressure inside the vertical furnace,the faster the reduction rate,and the higher the utilization rate of the reducing gas,which can increase the output per unit volume of the vertical furnace and reduce the total weight of the equipment;The temperature of gas entering the furnace is mainly determined by the composition of the gas inside the furnace.In order to fully utilize the reducing ability of H2 and avoid the occurrence of bonding inside the furnace,the temperature of gas entering the furnace is selected at around 950 ℃.With a high proportion of H2,the temperature of gas entering the furnace can be appropriately increased.
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维普
