木質バイオマスのガス化によるSNG製造技術の開発

抄録

This R&D project is being undertaken to establish a highly efficient process for SNG production from woody biomass by combining dual fluidized bed gasification with a novel methanation process under normal pressure. The R&D items include optimization of a dual fluidized bed gasifier (Twin IHI Gasifier (TIGAR^®)), development of a highly efficient tar reformer and a methanation process for gasified gas. Experimental results using a pilot gasifier showed that the TIGAR^® could be applied to any kinds of woody biomass regardless of fuel type such as pellet or chip. As for the development of highly efficient tar reformer, two kinds of reformer (regenerative reformer and catalytic reformer) were developed and tar reforming performance exceeding 99.5% was achieved in pilot-scale experiments; unreformed tar was less than 50mg/Nm3. Pilot-scale test of the methanation process was successfully conducted in continuous operation for about 50hrs; a methanation efficiency more than 76% had been obtained. Market survey showed that the business of SNG production from woody biomass will be profitable in south Asia.