(736d) Techno-Economic Evaluation of H2 Production Using Chemical Looping Dry Reforming
AIChE Annual Meeting
Wednesday, November 17, 2021 - 5:00pm to 5:30pm
In the present study, we perform a techno-economic evaluation of a CLDR process that is designed to maximize H2 production by combining CLDR with water gas shift (WGS) in order to utilize the produced CO for further H2 production. Different configurations are evaluated for supplying the heat required for the endothermic dry reforming reaction via combustion of additional CH4 or combustion of a fraction of the carbon produced in the cracker reactor using either pure oxygen or air. All configurations include CO2 capture and H2 purification via pressure swing adsorption. Building on our previous fixed-bed experimental results, reactor-level mass and energy balance calculations are performed and coupled with a systems-level model that incorporates thermodynamic calculations of individual process components such as water gas shift reactors, blowers, feed compressors, CO2 capture, PSA, and heat recovery equipment as well as steam turbines. Capital cost models for the major equipment and operating costs (catalysts, chemicals, fuel etc.) are also developed using data in the open literature. The results from the performance model are combined with the cost models to comparatively evaluate the three configurations based on performance and cost metrics such as energy efficiency, chemical efficiency, CO2 emissions, capital costs, and cost of H2 production. The results are compared with conventional H2 production pathways using steam reforming and dry reforming of methane. The results are used to identify areas where CLDR systems have technical and cost advantages over conventional processes and highlight factors which need improvement.