O207 高含水バイオマスの油中改質乾燥・ガス化システムの開発

概要

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R & D of advanced upgrading & gaisification system for biomass with high moisture are described in the paper. A dewatering technology in oil and a low temperature gasification technology are employed in the system. Results show that the dewatering process achieves 90% of thermal efficiency dealing with coffee grounds which include 65% moisture. In addition, upgraded biomass which includes highly dispersed Ca catalyst for gasification reactions is obtained by the dewatering process blending with 40g/kg-biomass CaOH. The upgraded biomass is fed into a gasifier named "the pyrolytic gasifier", which has a bubbling fluidized bed gasifier and a pneumatic transported bed char combustor. The syngas can be separated from the exthost gas of the char combustion, because heat from the combustion for endothermic gasification reaction is provided via circulating sand for fluidization medium. A design of the gasifier is examined by a reacting flow numerical simulation. The gasification process achieves 83% of cold gas efficiency and 2,500 to 3,500kcal/m^3N of syngas is obtained. A result of a thermal efficiency analysis of the whole system shows more than 75% of total cold gas efficinecy can be achieved and validity of the present system is confirmed.
一般社団法人日本エネルギー学会の論文
2006-01-17