期刊
APPLIED THERMAL ENGINEERING
卷 179, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.applthermaleng.2020.115728
关键词
Hydrogen and power production; Energy-efficient glycerol conversion; Chemical and calcium looping cycles; Carbon capture and storage; Techno-economic assessments
Glycerol represents a valuable side product from biodiesel production. This work evaluates glycerol valorization in view of energy-efficient hydrogen & power generation using chemical and calcium looping thermo-chemical cycles. Two looping options were evaluated: glycerol steam reforming followed by a syngas-based looping cycle and direct glycerol conversion in a looping cycle. The evaluated H-2 systems based on glycerol conversion via ilmenite and calcium looping cycles generate 100,000 Nm(3)/h high purity hydrogen coupled with a plant decarbonization rate up to 98%. Timely adjustable co-production of H-2 and electricity was also evaluated as limited (0 to 200 MW hydrogen thermal output) and fully flexible designs. As benchmark cases, a glycerol reforming design without CO2 capture and one decarbonized design by with pre-combustion chemical absorption using MDEA were considered. As the techno-economic investigations reveal, the overall energy efficiencies of thermochemical looping designs are superior to decarbonized glycerol reforming concept based on gas-liquid absorption by 5.3 to 11.7 net points as well as the decarbonization rates 93-98% vs. 71%. Flexible co-production systems show improved performance: higher efficiency (3.4 net points), reduced investment cost (9%) and electricity cost (11%) per 100 MW thermal hydrogen output.
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