Investigation of Natural and Synthetic Bed Materials for Their Utilization in Chemical Looping Reforming for Tar Elimination in Biomass-Derived Gasification Gas
Investigation of Natural and Synthetic Bed Materials for Their Utilization in Chemical Looping Reforming for Tar Elimination in Biomass-Derived Gasification Gas
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DOI：
10.1021/ef500369c
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发表时间：
2014-06-01
期刊：
影响因子：
5.3
通讯作者：
Thunman, Henrik
中科院分区：
文献类型：
--
作者：
Keller, Martin;Leion, Henrik;Thunman, Henrik
生物质气化原料气中可凝烃或焦油的脱除是生物质气化广泛应用的障碍。将热催化焦油清洗作为一种二次焦油去除策略作为焦油清洗技术进行了讨论。这可以在双流化床反应器系统中实现，在该系统中，催化活性床料被连续再生。这种过程被称为化学环重整(CLR)。在这样的过程中，有人建议使用氧载体颗粒进行化学循环燃烧，氧从颗粒转移到气体中促进焦油分解。在小型间歇式沸腾床反应器中进行了实验，目的是考察用于该过程的各种床料。因此，本工作的目的是对基于过渡金属Fe、Mn、Ni和Cu的各种床料进行筛选研究。实验在间歇沸腾床中进行，颗粒交替暴露在重整和再生器条件下。合成气化气混合物的乙烯转化率被用作焦油转化材料适用性的指标。结果表明，天然原料铝土矿和合成床料NiO/α-Al_2O_3、CuO/MgAl_2O_4、La_(0.8)Sr_(0.2)FeO_3/γ-Al_2O_3具有较高的乙烯转化率，在CLR中具有良好的应用前景
The removal of condensable hydrocarbons or tars from raw gas derived from biomass gasification presents an obstacle in the widespread application of biomass gasification. Hot catalytic tar cleaning as a secondary tar removal strategy is discussed as a tar cleaning technology. This can be realized in a dual-fluidized-bed reactor system, in which a catalytically active bed material is continuously regenerated. Such a process is termed chemical looping reforming (CLR). In such a process, it has been suggested that oxygen carrier particles employed for chemical looping combustion may be used, with the oxygen transfer from the particles to the gas promoting tar decomposition. Experiments were conducted in a small-scale, batch-wise fluidized-bed reactor with the aim of investigating a variety of bed materials for this process. The purpose of the present work is thus to conduct a screening study of a variety of bed materials based on the transition metals Fe, Mn, Ni, and Cu. The experiments were conducted in a batch fluidized bed, where the particles are exposed to reformer and regenerator conditions alternatingly. The conversion of ethylene from a synthetic gasification gas mixture was used as an indicator for the suitability of the materials for tar conversion. It was found that the natural material bauxite and the synthetic bed materials NiO/alpha-Al2O3, CuO/MgAl2O4, and La0.8Sr0.2FeO3/gamma-Al2O3 exhibit high ethylene conversion rates and, thus, possess promising properties for their application in CLR