抄録
Co-gasification of woody biomass and brown coal with air/steam was carried out in order to supply the syngas (CO+H_2) for the synthesis of liquid fuels such as methanol and dimethyl ether (DME). The experiment was done using a downdraft fixed bed gasifier at 900℃, atmospheric pressure, [O_2]/[C] of 0.5, and [H_2O]/[C] of 3. The effect of the feedstock with different content of woody biomass and brown coal on co-gasification behavior was studied by varying the biomass ratio of 0:1, which was the woody biomass content in the total feedstock on a carbon basis. The conversion to gas on a carbon basis increased from 58% to 98% with the biomass ratio. The main product gases were H_2 (27.7-45.5mol%), CO (22.0-29.1mol%), CO_2 (23.1-36.2mol%), and CH_4 (3.0-4.6mol%). The product gas derived from a low biomass ratio, a H_2/CO ratio was approximately 2.0, was favorable for methanol synthesis, while these from a high biomass ratio, a H_2/CO ratio was unit, was favorable for DME synthesis. Apparent synergy with the mixture of woody biomass and brown coal was not observed in terms of conversion to gas and product gas composition.
