生物质在流化床中的空气-水蒸气气化研究

The characteristics of biomass air-steam gasification in a fluidized bed were analyzed in this paper through a series of experiments. The effects of reactor temperature (700℃～900℃), steam to biomass ratio (0～4.04), equivalence ratio (0.19～0.27) and biomass particle size (0.2mm～0.9mm) on gas composition, gas yield, steam decomposition, lower heat value (LHV) of fuel gas were investigated. Under the experimental conditions examined, the fuel gas yield ranges between 1.43 Nm3/kg and 2.57 Nm3/kg biomass and the LHV of fuel gas ranges between 6741kJ/m3 and 9143 kJ/m3. The results show that higher temperature contributes to more hydrogen production, but lower LHV. Compared with biomass air gasification, the introduction of steam improves gas quality. But excessive steam will lower gasification temperature and degrade fuel gas quality. The biomass particle size also has influence on gas composition and gas yield. The smaller particle yields more CH4 and CO, but less CO2.