Effect of gasifying agent on
gas composition of biomass fluidized bed gasification with porous bed material
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摘要: 在自制小型常压流化床内采用多孔介质为床料，对生物质进行气化实验，分别考察了富氧气氛下温度和氧气浓度、水蒸气气氛下温度和水蒸气流量及不同种类床料对生物质产气特性的影响。结果表明，多孔床料下气化产气中可燃气体积分数随气化温度的提高而增大；随氧气浓度的增加，产气中H2的体积分数从14.52%增加到19.71%，CO的体积分数从43.41%降低到36.41%；气化剂水蒸气流量对生物质气化影响存在最佳范围；多孔床料种类不同对H2和CO的生成以及对低碳氢化合物（CxHy）的催化裂解强度的促进作用也不同。Abstract: The characteristics of biomass gasification in a fluidized bed with porous media as bed material were investigated by experiments. The effects of gasification temperature (600℃~900℃), oxygen enrichment in gasifying agent (0.21~0.50), steam flux and type of porous bed materials on gas composition were analyzed. The results show that the content of combustible gas increases with increasing gasification temperature. The hydrogen composition is improved from14.52% to 19.71%, but the CO composition is lowered from 43.41% to 36.41% by increasing the oxygen enrichment. There exists an optimum value for the steam flux during gasification. Different porous bed materials have different catalyses for the formation of H2, CO and the cracking of hydrocarbons.
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Key words:
- porous bed material /
- biomass /
- gasification /
- characteristic of product gas
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