Author:
Brigagão George Victor,Cruz Matheus de Andrade,Araújo Ofélia de Queiroz Fernandes,de Medeiros José Luiz
Abstract
Bioenergy from biomass wastes with carbon capture and storage (CCS) is an important way to compensate for hard-to-abate emissions and collaborate with decarbonizing the energy industry. This work evaluates a corncob-fired power generation with CCS regarding overall energy efficiency in two process alternatives: (a) post-combustion CO2 capture by an aqueous blend of methyl-diethanolamine and piperazine; and (b) oxy-combustion coupled to state-of-art air separation unit. The alternatives are simulated in Aspen HYSYS and compared with a conventional plant to evaluate the energy penalty of capturing CO2. The lean solvent composition is optimized for the lowest regeneration heat demand (2.92 GJ/tCO2). Post-combustion capture designed for 90% CO2 abatement presents an efficiency penalty of 7.96%LHV. In contrast, Oxy-combustion has zero CO2 emissions and outperforms Post-combustion with a lower penalty of 6.77%LHV, given a chance to have oxygen supplied at an energy cost of 139 kWh/tO2. To render Post-combustion the most efficient route, it would be necessary to have its reboiler heat ratio reduced to 2.30 GJ/tCO2.
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