CaO对木屑水蒸气气化制取富氢燃气的影响

发布时间：2018-03-06 15:28

  本文选题：生物质　切入点：水蒸气气化　出处：《林产化学与工业》2017年02期 　论文类型：期刊论文

【摘要】：以木屑为生物质原料,水蒸气为气化介质,CaO为催化剂,在固定床气化炉中进行生物质催化气化制取富氢燃气,考察了CaO与木屑中碳元素的物质的量比(n(Ca)/n(C))、气化温度和水蒸气流量对生物质水蒸气气化特性的影响。结果表明,当n(Ca)/n(C)由0增加至1.0时,H_2体积分数由45.58%增至58.62%,产气率由1.04 m~3/kg增至1.38 m~3/kg,当n(Ca)/n(C)继续增至1.5时,两者均有增加,但是变化不明显;气化温度从700℃增至750℃时,产气中H_2体积分数由51.78%增至58.62%,CO_2由19.89%降至12.60%,继续升高温度,H_2体积分数逐渐降低,燃气热值也降低;水蒸气流量由0.1 g/(min·g)增至0.34 g/(min·g)时,H_2的体积分数由58.62%增至62.55%,水蒸气流量继续增大时,H_2的体积分数和产氢率降低,燃气热值也降低。通过实验选择的最佳气化条件为以CaO为催化剂,n(Ca)/n(C)为1,气化温度750℃,水蒸气流量为0.34 g/(min·g),此时,制取的富氢燃气中H_2体积分数达到最大为62.55%,产氢率为85.08 g/kg,燃气热值为11.41 MJ/m~3。
[Abstract]:Hydrogen rich gas was prepared by catalytic gasification of biomass in a fixed bed gasifier using wood chips as biomass feedstock and steam as gasification medium Cao as catalyst. The effects of gasification temperature and water vapor flow rate on the gasification characteristics of biomass water vapor were investigated. When the volume fraction of H2 increased from 0 to 1.0, the volume fraction of H2 increased from 45.58% to 58.62and the gas production rate increased from 1.04 mc3kg to 1.38mcm3 / kg, and both of them increased, but the change was not obvious, when the temperature of gasification increased from 700 鈩，

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