Research progress of carbon emission reduction technology with biochar replacing pulverized coal/coke for blast furnace ironmaking
The steel industry is a major energy consumer and carbon emitter,so seeking zero-carbon raw materials that can replace traditional coal in the context of carbon neutrality is a key carbon emission reduction technology for the steel industry.Biochar has the characteristics of carbon neutrality,and the carbon content and calorific value are close to that of coal,which is an ideal alternative raw material for pulverized coal and coke.This paper introduced the potential utilization methods of biochar in coking,sintering and blast furnace ironmaking,focused on the physical and chemical characteristics of biochar when applied to blast furnace ironmaking and expounded the effects and mechanisms of biochar alkali metal,strength,particle size and specific surface area in coal substitution.Aiming at the problems of alkali metal reducing coke strength,demineralization methods such as pickling were introduced to reduce the content of biochar alkali metal.Aiming at the problem that biochar had poor mechanical strength and was difficult to enter the furnace,the formation mechanism of coke strength and the enhancement process of biochar molding were summarized.In view of the problem of poor fluidity of coking coal mixture caused by biochar,the negative impact on coke was reduced by adjusting the particle size and specific surface area of biochar.Finally,the domestic and international progress of biochar in replacing pulverized coal and coke for blast furnace ironmaking and the expected CO2 emission reduction effect were summarized.By analyzing the challenges of the current industrial application of biochar instead of coal/coke and the related research on life cycle assessment,it will provide technical support for the future carbon neutrality of the steel industry.
biomassbiocharblast furnace ironmakingsubstitution for coal and cokecarbon dioxidecarbon neutrallife cycle assessment
万方数据
维普
