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Influence of steam on gasification of millimetric wood particles in a drop tube reactor: Experiments and modelling

机译：蒸汽对滴管反应器中木屑颗粒气化的影响：实验和模型

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摘要

Wood particle conversion in a drop tube reactor was studied between 1000 ℃ and 1400 ℃, both with experiments and simulations using a comprehensive model. Particular attention was paid to the influence of steam on the gasification process, and to the wood particle size. The model included a description of the different phenomena involved in biomass conversion: pyrolysis, gas phase reactions, soot formation and carbonaceous solid gasification. Satisfactory results were obtained in comparison with experiments. The addition of steam in the atmosphere influenced char, tar, soot and gas yields, especially at 1200 ℃ and 1400 ℃ These changes were linked to char and soot steam gasification, and to gas phase reactions, among which hydrocarbons steam reforming and water-gas shift. At 1400 ℃, with 25 mol% H_2O and after a residence time of 4.4 s, the char seems to be completely gasified, while the soot yield still represents about 5 wt% of the initial dry biomass. Wood particle size in the range 0.35-0.80 mm was experimentally shown to have no influence on products yields for a residence time of a few seconds.
机译：利用一个综合模型进行了实验和模拟，研究了在滴管式反应器中木材颗粒转化率在1000℃至1400℃之间。特别要注意蒸汽对气化过程的影响以及木材的粒径。该模型包括对生物质转化涉及的不同现象的描述：热解，气相反应，烟灰形成和含碳固体气化。与实验相比，获得了满意的结果。大气中蒸汽的添加特别是在1200℃和1400℃时会影响焦炭，焦油，烟灰和气体的产率。这些变化与焦炭和烟灰蒸汽的气化以及气相反应有关，其中烃蒸汽重整和水煤气转移。在1400℃，H_2O为25 mol％且停留时间为4.4 s后，炭似乎已完全气化，而烟灰收率仍占初始干燥生物量的5 wt％。实验表明，在几秒钟的停留时间内，木材粒度在0.35-0.80 mm范围内对产品产量没有影响。

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