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Biomass pyrolysis experiments in an analytical entrained flow reactor between 1073 K and 1273 K

机译：在1073 K和1273 K之间的分析气流床中进行生物质热解实验

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摘要

Experiments are performed in an entrained flow reactor to better understand the kinetic processes involved in biomass pyrolysis under high temperatures (1073-1273 K) and fast heating condition ( > 500 K s~(-1)). The influence of the particle size (0.4 and 1.1 mm), of the temperature (1073-1273 K), of the presence of steam in the gas atmosphere (0 and 20 vol%) and of the residence time (between 0.7 and 3.5 s for gas) on conversion and selectivity is studied. Under these conditions, the particle size is the most crucial parameter that influences decomposition. For 1.1 mm particles, pyrolysis requires more than 0.5 s and heat transfer processes are limiting. For 0.4 mm particles, pyrolysis seems to be finished before 0.5 s. More than 70 wt% of gas is produced. Forty percent of the initial carbon is found in CO; less than 5% is found in CO_2. The hydrogen content is almost equally distributed among H_2, H_2O and light hydrocarbons (CH_4, C_2H_2, C_2H_4). Under these conditions, the evolution of the produced gas mixture is not very significant during the first few seconds, even if there seems to be some reactions between H_2, the C_2 and tars.
机译：在气流床反应器中进行实验，以更好地理解高温（1073-1273 K）和快速加热条件（> 500 K s〜（-1））下生物质热解的动力学过程。粒径（0.4和1.1毫米），温度（1073-1273 K），在气体气氛中存在蒸汽（0和20体积％）以及停留时间（0.7到3.5 s之间）的影响对于气体）的转化率和选择性进行了研究。在这些条件下，粒径是影响分解的最关键参数。对于1.1毫米的颗粒，热解需要0.5秒以上的时间，并且传热过程受到限制。对于0.4 mm的颗粒，热解似乎在0.5 s之前完成。产生了超过70重量％的气体。在CO中发现了40％的初始碳；在CO_2中发现少于5％。氢含量几乎在H_2，H_2O和轻烃（CH_4，C_2H_2，C_2H_4）中平均分布。在这些条件下，即使在H_2，C_2和焦油之间似乎发生了一些反应，在最初的几秒钟内所产生的气体混合物的释放也不是很明显。

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