green steel production: integrating amine-based co2 capture into conventional midrex direct reduction process

Since the reduction of co2 emission has become particularly important in recent decades, efforts are being made to lower emissions and shift towards sustainable clean energy sources, especially in the carbon-intensive iron and steel industry. previous research has explored the hydrogen-based direct reduction technology, utilizing green hydrogen instead of natural gas (ng) in the process. due to the economic constraints and the current technological limitations, this work focuses on chemical absorption using amine absorbent which is one of the most developed routes for co2 absorbing from industrial plants flue gases. this involves two main sections: capturing co2 by amine solvent and regenerating absorbent. a monoethanolamine (mea)-based co2 capture unit is simulated in aspen plus software to capture co2 from the flue gases of an ng-based midrex plant. the properties of the flue gas are considered based on the local mega module direct reduction plants in iran. the simulation results demonstrate that the integration of the midrex plant with co2 capture technology is a promising procedure for carbon footprint decrement. the proposed system is able to capture 25.3 kg/s co2 from flue gas. meanwhile, the carbon capture ratio, reboiler duty, and lean amine pump duty are calculated as 90%, 98.97 mw, and 32.67 kw, respectively.