Study on the carbon reduction potential of blast furnace injection process using reformed coke oven gas
The iron and steel industry accounts for 14%—18%of the total carbon emissions in China,making it the highest emitting sector in the industrial field.The blast furnace-basic oxygen furnace process contributes to 89%of the total steel production in China.This process is characterized by a long flow path and emits 2 tons of carbon per ton of steel produced.Carbon emission reduction based on the blast furnace-converter process is key to the steel industry's decarbonization goals.Based on the energy balance model,this study focuses on analyzing the impact of using coke oven gas and reformed coke oven gas for blast furnace injection on process parameters such as direct reduction degree and theoretical coke ratio.It aims to systematically evaluate the potential carbon dioxide emission reduction benefits of this approach.The results indicate that increasing the injection volume and temperature of hydrogen-rich gas effectively reduces coke consumption.However,under the same injection volume conditions,increasing the hydrogen purity leads to a slight increase in coke consumption due to heat compensation.When the coke oven gas is reformed to yield hydrogen gas with a purity of 97.9%,a carbon reduction of 34.62%in the blast furnace can be achieved.Compared to direct injection of coke oven gas,the potential for carbon reduction is increased by 17.76%.The carbon reduction mainly stems from the decrease in coke consumption and the reduced carbon content in the injected gas.Power generation from blast furnace gas is also a crucial step in carbon reduction.When the hydrogen purity of the injected gas is increased from 59%to 97.9%,the carbon reduction potential in this step is improved from 9.04%to 10.85%.The reformation of coke oven gas in the blast furnace injection process has the potential to surpass the upper limit of carbon reduction achievable with hydrogen-rich gas,making it a promising approach with potential for widespread implementation.
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