Environmental and techno-economic analyses of oxygen blast furnace systems integrated with carbon capture and utilization strategy

For mitigating net CO 2 emissions of the oxygen blast furnace (OBF) system, the top gas recycling by connecting a Monoethanolamine (MEA)-based CO 2 capture process as Scenario 1 (OBF + CC) and a carbon capture and utilization (CCU) process as Scenario 2 (OBF + CCU) is proposed. Scenario 2 utilizes a Triethylene glycol (TEG) physical absorption process for producing an industrial-grade 99.999 % purity liquid CO 2 product. Carbon tracking in Aspen Plus indicates that Scenario 2 achieves significantly lower CO 2 emissions with 4.1 kg CO 2 /tHM than Scenario 1 with 770 kg CO 2 /tHM. To synergize Aspen Plus® modeling and environmental impact assessment using SimaPro®, Scenario 2 has a lower impact on eutrophication potential, acidification potential, water depletion, and fossil resource depletion as compared to Scenario 1. Techno-economic analysis of Scenario 2 indicates that the liquid CO 2 product generates a potential profit of 973.95 USD/tHM, which fully offsets the CO 2 production cost of 378.33 USD/tHM in the CCU process. • The process integration of OBF, MEA-based CO 2 capture, and TEG physical absorption is presented. • The environmental impact assessment of OBF + CCU system indicates CO 2 emissions with 4.1 kg CO 2 /tHM. • The techno-economic analysis of OBF + CCU system shows the revenue with 973.95 USD/tHM.