Hydrogen Production in Steam Gasification of Biomass with CaO as a CO2 Absorbent
Hydrogen Production in Steam Gasification of Biomass with CaO as a CO2 Absorbent
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DOI：
10.1021/ef700744a
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发表时间：
2008-05
期刊：
影响因子：
5.3
通讯作者：
Ligang Wei;Shaoping Xu;Jingang Liu;Changhou Liu;Shuqin Liu
中科院分区：
文献类型：
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作者：
Ligang Wei;Shaoping Xu;Jingang Liu;Changhou Liu;Shuqin Liu
研究了以CaO作为CO2吸附剂的外循环同步移动床（ECCMB）系统常压下生物质蒸汽气化制氢的特性。在这个ECCMB系统中，生物质的蒸汽气化、原位CO2捕获、产生的炭的燃烧和CaCO3的煅烧可以同时发生。实验结果表明，煅烧石灰石作为CO2吸附剂可以实现CO2的原位捕集，增加了水气转换反应的程度，提高了H2的产率。当蒸汽/生物质质量比（S/B）为0.38 ~ 0.59，CO2吸收剂/生物质质量比（a /B）为20，反应器温度为700 ~ 800℃时，干气中H2含量为60 ~ 70 mol %。结果表明，添加cao基CO2吸附剂是提高ECCMB工艺干气中氢含量的良好解决方案。在循环过程中，CO2吸收剂发生了不可逆的失活。
Characteristics of steam gasification of biomass for hydrogen production at ambient pressure in a laboratory-scale external circulating concurrent moving bed (ECCMB) system with CaO as a CO2 absorbent were investigated. In this ECCMB system, steam gasification of biomass, in situ CO2 capture, combustion of the produced char, and calcination of CaCO3 can occur simultaneously. The experimental results verified that the in situ CO2 capture was achieved with calcined limestone as a CO2 absorbent, which increased the extent of the water−gas shift reaction and enhanced the yield of H2. The H2 content of 60−70 mol % in dry gas can be obtained at a steam/biomass weight ratio (S/B ratio) of 0.38–0.59 and a CO2 absorbent/biomass weight ratio (A/B ratio) of 20 at the reactor temperature of 700–800 °C. The results showed that the addition of a CaO-based CO2 absorbent is a good solution to increase hydrogen content in dry gas from the ECCMB process. An irreversible deactivation of the CO2 absorbent occurred in the cyc...