Abstract This study investigated the effect of shrinking and non-shrinking biomass geometries in a fixed bed reactor. Model simulation was performed to analyze the effect of biomass moisture content, gasification temperature, air flow rate, oxygen content in the primary air, and mass transfer coefficient on product yield for spherical, tabular, and cylindrical biomass briquettes. The model matched well with the experimental data. The production of hydrogen and carbon dioxide increased with an increase in moisture content. With an increase in gasification temperature, the water–gas shift reaction proceeded faster than the Boudouard reaction, leading to a decrease in the carbon dioxide composition and an increase in the carbon monoxide composition. Tabular shrinking particles with a H2/CO ratio of 1.44 and a CO/CO2 ratio of 0.22 at 1175 K were more favorable for producing value-added chemicals than the particles of all other geometries. The non-shrinking spherical particles had the highest low heating value (LHV) of 4.65 MJ/m3, whereas the tabular non-shrinking particles had the lowest LHV of 1.33 MJ/m3 among the shrinking and non-shrinking particles with all the other geometries considered. The gasification temperature was the most sensitive parameter, whereas moisture content and the mass transfer coefficient were the least sensitive parameters.

中文翻译：

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下吸式气化过程建模：第二部分 - 研究收缩和非收缩生物质几何形状对气化过程性能的影响

摘要 本研究调查了固定床反应器中收缩和非收缩生物质几何形状的影响。进行模型模拟以分析生物质水分含量、气化温度、空气流速、一次空气中的氧含量和传质系数对球形、板状和圆柱形生物质压块产品产量的影响。该模型与实验数据吻合良好。氢气和二氧化碳的产量随着水分含量的增加而增加。随着气化温度的升高，水煤气变换反应比Boudouard反应进行得更快，导致二氧化碳成分减少和一氧化碳成分增加。H2/CO 比为 1.44，CO/CO2 比为 0 的板状收缩颗粒。22 在 1175 K 比所有其他几何形状的颗粒更适合生产增值化学品。在所有其他几何形状的收缩和非收缩颗粒中，非收缩球形颗粒的低热值 (LHV) 最高，为 4.65 MJ/m3，而板状非收缩颗粒的 LHV 最低，为 1.33 MJ/m3经过考虑的。气化温度是最敏感的参数，而水分含量和传质系数是最不敏感的参数。33 MJ/m3 在考虑所有其他几何形状的收缩和非收缩颗粒中。气化温度是最敏感的参数，而水分含量和传质系数是最不敏感的参数。33 MJ/m3 在考虑所有其他几何形状的收缩和非收缩颗粒中。气化温度是最敏感的参数，而水分含量和传质系数是最不敏感的参数。