State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology

碳捕集利用与封存(简称CCUS)技术是钢铁行业实现碳中和目标的可行选择,但是我国钢铁生产以高炉-转炉长流程生产为主,产生碳排放的工序众多且碳浓度较低,目前仍缺少经济高效的碳捕集方案。在此背景下,通过引入气化炉用于重整炉顶煤气,改进现有炉顶煤气循环-氧气高炉工艺的炉顶煤气循环方式,耦合富氧燃烧碳捕集技术,提出一种基于重整煤气喷吹-氧气高炉的富氧燃烧碳捕集方案,并利用AspenPlus建模计算和碳流分析评估了该方案的节能减排潜力。结果表明:富氧燃烧碳捕集技术与氧气高炉低碳冶炼工艺有着良好的承接性与耦合性,两者耦合能够降低钢铁行业碳捕集的难度;富氧燃烧单位CO2的捕集能耗为2623.91kJ/kg,比现有的醇胺法的碳捕集能耗低51.4%,比变压吸附法的碳捕集能耗低26.2%;生产每吨钢材可通过富氧燃烧捕集到1.5tCO2,有望实现钢铁生产过程的CO2净零排放。总的来说,该方案能够在高炉低碳冶炼的基础上进行低成本、大规模的碳捕集,是钢铁行业绿色低碳转型的可行方案。

Carbon capture, utilization and storage (CCUS) technology presents a viableoption for the iron and steel industry to achieve carbon neutrality. However, in China, the pre-dominant steel production technique involves blast furnace-basic oxygen furnace long flow process, resulting in numerous processes and low-concentration carbon emission. Hence, eco-nomically efficient carbon capture solutions are still lacking. Against this context, through intro-ducing gasifier to reforming top gas, the existing top gas recycling-oxygen blast furnace process can be improved. A carbon capture scheme was proposed based on reforming gas injection-oxygen blast furnace process coupled with oxy-fuel combustion technology. In addition, the potential for energy-saving and carbon emission reduction of this scheme was evaluated through employing modeling and carbon flow analysis method in Aspen Plus. The results show that the carbon cap-ture technology using oxy-fuel combustion method exhibits good integration and coupling effects with the low-carbon smelting process of oxygen blast furnace, reducing the complexity of carbon capture in the steel industry. The energy consumption of unit CO2 capture using oxy-fuel com-bustion method is 2 623.91 kJ/kg, which is 51.4% lower than that of the existing amine-based absorption technique and 26.2% lower than that of the pressure swing adsorption method. This approach can capture 1.5 t CO2 per ton of steel produced, potentially achieving carbon neutrality in the steel production process. Overall, this scheme enables low-cost and large-scale carbon cap-ture on the basis of low-carbon smelting in blast furnaces, which is a feasible solution for the green and low-carbon transformation of the steel industry.

国家重点研发计划项目(2021YFF0601000).

黄志辉,毛文超,李小姗,等.基于重整煤气喷吹-氧气高炉的富氧燃烧碳捕集方案[J].煤炭转化,2024,47(1):71-80

HUANG Zhihui,MAO Wenchao,LI Xiaoshan,et al.Carbon capture scheme for oxy-fuel combustion based on reforming gas injection-oxygen blast furnace[J].Coal Conversion,2024,47(1):71-80