Abstract Investigation on the biomass components pyrolysis behaviors in a lab-scale reactor is a necessary step before its industrialization due to the poor transportability of the findings obtained from the micro-scale pyrolyzer which often neglects the heat and mass transfer effect. In present study, the pyrolysis behavior of xylan-based hemicellulose in a fixed bed reactor was investigated. The residue evolution and bio-oil composition of xylan, xylose, arabinose and glucose show the close relationship of pyrolysis characteristics between xylan and its components. It is noteworthy that the xylan and those mono-sugar units melted during pyrolysis, and many bubbles formed. Investigation of the effect of temperature, material thickness and carrier gas flow rate on the products distribution and bio-oil composition indicates that high temperature promotes the xylan conversion and increases the yield of bio-oil, however, if the temperature is too high (> 500°C), violent decomposition of xylan occurs and leads to the formation of low molecular weight compounds (such as hydroxyl acetaldehyde, acetic acid and 1-hydroxyl-2-propaone etc.). And interestingly, the bio-oil yield increases monotonically with the material thickness, and thick material layer can increase the content of furfural in bio-oil. Carrier gas flow rate has a little influence on the xylan char yield, and relative high carrier gas flow rate (> 2.55L/min) could decrease the secondary decomposition of primary didehydrated pentose but reduce the bio-oil yield.

中文翻译：

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木聚糖基半纤维素在固定床反应器中的热解行为

摘要 由于从微型热解器中获得的研究结果的可传输性差，经常忽略传热和传质效应，因此在实验室规模的反应器中研究生物质组分的热解行为是其工业化之前的必要步骤。在本研究中，研究了木聚糖基半纤维素在固定床反应器中的热解行为。木聚糖、木糖、阿拉伯糖和葡萄糖的残留物演化和生物油组成表明木聚糖及其组分之间的热解特性密切相关。值得注意的是，木聚糖和那些单糖单元在热解过程中熔化，形成了许多气泡。研究温度的影响，材料厚度和载气流量对产物分布和生物油成分的影响表明高温促进木聚糖转化并提高生物油的产率，但如果温度过高（> 500°C），则分解剧烈发生木聚糖分解并导致形成低分子量化合物（如羟基乙醛、乙酸和 1-羟基-2-丙酮等）。有趣的是，生物油产率随着材料厚度的增加而单调增加，厚材料层可以增加生物油中糠醛的含量。载气流速对木聚糖焦产率影响不大，较高的载气流速（>2.55L/min）可减少初级二脱水戊糖的二次分解，但降低生物油产率。