Development of catalytic tar decomposition downstream from a dual fluidized bed biomass steam gasifier
Development of catalytic tar decomposition downstream from a dual fluidized bed biomass steam gasifier
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DOI：
10.1016/j.powtec.2007.03.008
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发表时间：
2008-01
影响因子：
5.2
通讯作者：
C. Pfeifer;H. Hofbauer
中科院分区：
文献类型：
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作者：
C. Pfeifer;H. Hofbauer
生物质气化是一种具有吸引力的热电联产技术。尽管在过去十年中进行了大量的研究和开发工作，但这项技术的商业突破仍有待实现。到目前为止，尚未完全解决的一个问题是产品气体中的焦油含量，这可能导致工厂较冷部分的堵塞。在可能的气体清洁方法中，催化热气清洁是相当有前途的，因为焦油的完全破坏而不是产生难以处理的废物流。在实验室规模的反应器中，以合成气混合物和焦油模型化合物为进料，测量了不同的催化剂。用于重质烃（特别是石脑油）的商业蒸汽重整催化剂被证明是最好的焦油分解催化剂。基于这些结果，生产了3种镍基整料型催化剂，然后在实验室规模的反应器中进行测试，所述反应器由取自奥地利Güssing的8 MW双流化床蒸汽气化器装置的滑流进料。在850 °C以上的温度和约1100 h-1的空速下，在该催化剂上可以实现几乎完全的焦油和相当大的氨分解。
Gasification of biomass is an attractive technology for combined heat and power production. Although a lot of research and development work has been carried out during the past decade the commercial breakthrough for this technology is still to come. One problem that has not been completely solved so far is the tar content in the product gas, which can cause plugging in the colder parts of the plant. Among the possible gas cleaning methods, catalytic hot gas cleaning is rather promising because of the complete destruction of the tars instead of creating a waste stream which is difficult to dispose. Different catalysts were measured in laboratory scale reactors fed by synthetic gas mixtures and tar model compounds. Commercial steam-reforming catalysts for heavy hydrocarbons (particularly naphthas) proved best as tar decomposing catalysts. Based on these results 3 nickel-based monolith type of catalyst were produced and afterwards tested in a laboratory scale reactor fed by slip streams taken from the 8 MW dual fluidized bed steam gasifier plant in Güssing, Austria. Almost complete tar and considerable ammonia decomposition could be achieved over this catalyst at temperatures above 850 °C and space velocities of about 1100 h−1.