| 초록 |
The dual fluidized bed biomass gasification is a promising technology to produce synthesis gas (H2 + CO) having a medium heating value without N2 dilution. In this study, a dual fluidized bed gasifier (DFBG) which consists of a riser (0.078 m-I.D x 8.6 m-high) as a combustor and in a bubbling bed as a gasifier (0.2 m-I.D. x 2.1 m-high) was operated. Sawdust was fed as biomass feed. Gasification characteristics depending on reaction temperature (750-900℃), steam/biomass ratio (0.1-0.7) and bed materials (silica sand, CaO) were determined. Product gas compositions of H2 and CO using silica sand were 38-52% and 22-26%, respectively. When CaO was fed, over 60% ofH2 could be obtained but CO and CO2 was decreased. This is why water-gas shift reaction is dominant by CO2 absorption of CaO. From this study, CaO as bed material has advantages for high purity H2 production and tar reduction. |
