(515g) CO2 Utilization Via Chemical Looping Dry Reforming: Process Modeling and Systems Analysis
In our study, the overall system is designed to produce a desired flow rate and composition of the syngas (i.e. the CO/H2 ratio) from natural gas, while maximizing the yield and minimizing the overall energy consumption. The CO2 feed is assumed to come from a CO2 capture at a power plant or other industrial process. Building on our previous fixed-bed experimental results, reactor-level mass and energy balance calculations are performed to calculate the effect of operating conditions such as flow rates, solids conversion and temperature on the final product composition, selectivity and yields. The systems-level model includes thermodynamic calculations of individual process components such as blowers, compressors, and heat recovery equipment, as well as steam turbines. Using sensitivity analysis on parameters such as selectivity and fuel conversion, we identify the carbon carrier properties required to improve process performance, and compare results to a conventional CO2 dry reforming process as well as to conventional H2 production pathways from CH4 using autothermal reforming or steam methane reforming. Preliminary cost assessments will also be conducted to evaluate the comparative economic feasibility of the CLDR process.
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