Performance Analysis of Entrained-Flow Bed Co-gasification of Biomass and Coal

摘要

Biomass is one of the most promising renewable energy sources. Co-gasification of biomassand coal has been proposed as a bridge between energy production based on fossil fuels andenergy production based on renewable fuels. Based on ASPEN PLUS, the entrained-flowco-gasification of biomass and coal was simulated, and its economic and environmentalbenefits were analyzed. The results showed that with the increase of the biomass mass fractionin mixture (R), the ash fusion temperatures of the biomass and coal mixtures totally decreased; thecontent of effective gas in sysgas decreases a little; specific oxygen consumption has little change,specific raw material consumption increases significantly, however, specific coal consumptiondecreases observably. Compared with pure Baodian coal gasification, when R is 10%, 20% and30%, the H_2/CO molar ratio is enhanced by about 4%, 8% and 13% respectively, specific coalconsumption is reduced by 5.8%, 11.9% and 18.3% respectively. The entrained-flowco-gasification of biomass and coal is feasible as long as R is controlled within appropriate range.Moreover, it contributes significantly to the preservation of coal reserves and thereduction of the net CO_2 emission into the atmosphere.