| 초록 |
Biomass (sawdust) gasification characteristics in a dual fluidized bed 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) has been determined with operating variables. Air (combustor) and steam (gasifier) were used as fluidizing agents and the effects of reaction temperature (750-900℃), steam/biomass ratio (0.1-0.7) and bed materials (silica sand, limestone) are determined. Product gas having a medium heating value (about 12 MJ/m3) could be obtained from overall operating conditions and product gas dilution by nitrogen was not observed. The total product gas yield was 0.8-1.1m3/kg-biomass. Product gas compositions of H2 and CO using silica sand were 38-52% and 22-26%, respectively. When limestone was fed, over 60% ofH2 could be obtained but CO and CO2 was decreased. |
