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• Novel DISPLACE and CASOH carbon capture technologies are investigated. • Integration of DISPLACE and CASOH in a conventional steel plant is analysed. • Aspen Plus has been used to model the carbon capture technologies. • CO 2 avoidance of 72 % can be reached in a renewable energy scenario. • A cost of CO 2 avoided equal to 92 €/t CO2 can be achieved. Given the severe climate crisis and the urgent need to limit the adverse effects of global warming, drastic changes are required across various industries. Among them, the iron and steel sector is a major contributor to greenhouse gas emissions, accounting for approximately 7 % of global CO 2 emissions. This study proposes the integration of innovative carbon capture technologies, such as DISPLACE and CASOH, into a conventional BF-BOF (Blast Furnace-Basic Oxygen Furnace) steelmaking process. A comprehensive techno-economic analysis was conducted, supported by simulations performed in Aspen Plus, to optimize the integration of these technologies. The study suggests a redesigned gas distribution system within the BF-BOF steel plant, incorporating oxy-fired units to facilitate post-combustion carbon capture and minimize the plant emissions. The analysis reveals that, employing CASOH for pre-combustion CO 2 capture to decarbonize a mixture of BFG (Blast Furnace Gas) and BOFG (Basic Oxygen Furnace Gas), combined with DISPLACE for decarbonizing flue gases from hot stoves, sinter plant, and reheating ovens, 72 % reduction in CO 2 emissions and a SPECCA around 0 GJ/t CO2 can be achieved. This is attainable within a renewable electricity scenario, at a cost of 138 € per ton of CO 2 avoided. Lower CO 2 avoidance values can also be achieved by treating less exhaust gases with reduction in both SPECCA and costs.
Zecca et al. (Wed,) studied this question.