43.木質系バイオマスのCO_2吸収ガス化における木材種およびCO_2吸収剤種に関する基礎的検討

抄録

In H_2 production from woody biomass by steam gasification in the presence of a CO_2 sorbent (CO_2 absorptive gasification), the effect of the types of woody biomass and a CO_2 sorbent was investigated on gasification such as H_2 yield at 650℃, 0.9MPa using a conventional autoclave. Japanese oak, Japanese cedar, and Japanese red pine bark were employed as a biomass feedstock. MgO, CaO, SrO, and BaO were used as a CO_2 sorbent. In all runs, the product gas mainly contained clean gas such as H_2 and CH_4, and no CO_2. The H_2 yields on a carbon basis in the feedstock were 0.48 to 0.60 H_2-mol/C-mol, and were almost independent of the type of biomass feedstock. The gasification of lignin in the woody biomass could largely contribute to the H_2 production in the CO_2 absorptive gasification. The H_2 yields in CaO, SrO, and BaO were almost 0.55 to 0.59 H_2-mol/C-mol, and were higher than that in MgO (0.17 H_2-mol/C-mol).