Techno-economic assessment and exergy analysis of iron and steel plant coupled MEA-CO2 capture process
Yuhang Yang, Tao Du, Yingnan Li, Qiang Yue, Heming Wang, Liying Liu, Shuai Che, Yisong Wang
Abstract
In the interest of mitigating global warming and climate change , the steel industry urgently needs to take measures to reduce CO 2 emissions. In the context, this study is to evaluate the application value and feasibility through the techno-economic assessment and exergy analysis of the iron and steel industry coupled MEA-CO 2 capture process. The integrated process, successfully implemented in Aspen Plus v12®. Considering the influence of heat integration and capture scale, scenarios 1–4 are designed: 1. Full-flow carbon capture, using outsourced steam; 2. Full-flow carbon capture with heat recovery and outsourced steam mixed use; 3. Partial-flow carbon capture only using surplus steam; 4.100,000 tons of CO 2 /year of capture scale, using outsourced steam. The process can achieve an effective gas capture rate of 90% and a CO 2 product purity of 98.3%. The maximum annual CO 2 emission reduction is about 7.65 million tons in scenarios 1 and 2. Compared with scenario 1, the CO 2 capture cost of scenario 3 decreased by 22.1%, 29.0%, 23.9% and 21.2%, while that of scenario 4 increased by 44.1%, 39.5%, 25.3% and 18.0%. Through exergy analysis, the total exergy efficiency is calculated to be 38.04%, and the components that need attention and improvement in the process are diagnosed. TTAShis provides a reference for the performance analysis and application feasibility of the coupling process of CO 2 capture and waste heat utilization from steel plant.