CO2 utilization potential of a novel calcium ferrite based looping process fueled with coal: Experimental evaluation of various coal feedstocks and thermodynamic integrated process analysis

Ranjani Siriwardane, Jarrett Riley and Chris Atallah

Applied Energy, 2022, vol. 323, issue C, No S0306261922009369

Abstract: Conversion of CO2 to CO was performed at 800–850 °C via reduction of calcium ferrite (CaFe2O4) with coal followed by oxidation of reduced CaFe2O4 with CO2 to produce CO and partially oxidized Ca ferrite. The process was evaluated with several types of coals which included lignite, sub-bituminous, bituminous, anthracite and pet-coke. Reduction of CaFe2O4 with sub-bituminous coal and lignite coal was more favorable than that with higher rank coals. Stable reactivity performance was demonstrated for 35-cycle test conducted with lignite coal/CaFe2O4 at 800 0C and with high conversion of CO2 to CO. The rate of conversion of CO2 to CO with reduced CaFe2O4 was found to be 1st order with respect to CO2 and had a low activation energy of 7.4 kJ/mol. Thermodynamic integrated process assessments suggest that two and three reactor process concepts can be realized and net CO2 utilization achievable. The Two reactor configuration shows the highest potential for CO2 utilization while generating a value-added CO rich syngas stream.

Keywords: Conversion of CO2 to CO; Chemical looping CO2 conversion; Oxygen carriers for CO2 conversion; Conversion of CO2 with coal/oxygen carriers (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1016/j.apenergy.2022.119634

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