超临界水气化驱动氢冶金(竖炉-电弧炉):低碳化路径与技术挑战OA

To explore the path for deep decarbonization in the iron and steel industry,this study proposes an integrated system coupling supercritical water gasification with hydrogen production-shaft furnace-electric arc furnace.By analyzing its process flow,core technologies and performance indicators,the technical feasibility and engineering challenges of the system are evaluated.The results show that,the system can efficiently convert lignin,sludge and other organic wastes,generating hydrogen-rich syngas with an H2 volume fraction over 60％at 500-600℃ and 22-25 MPa.The 2 000 Nm3-scale system achieves a combined hydrogen and heat production efficiency of 83.66％with a hydrogen production rate of 197 kg/h.Applied to hydrogen-based ironmaking,the syngas enables the direct reduced iron to reach a metallization rate over 90％,cutting the energy consumption of electric arc furnace steelmaking by more than 15％.The system demonstrates significant emission reduction potential,with the shaft furnace-electric arc furnace process achieving a 47.45％reduction compared to the blast furnace-converter process.By integrating the carbon-neutral characteristics of supercritical water gasification with high-capture-rate of CCUS(capture,utilization,and storage)technologies,near-zero or even negative carbon emissions can be achieved,with the downstream process already validated at an industrial scale.However,the system still faces challenges like equipment corrosion and catalyst deactivation.It is imperative to break through core technologies and accelerate pilot testing and demonstration to advance the low-carbon transformation of the iron and steel industry.