This study deals to improve the understanding of biomass thermo-chemical conversion in a dense and fast internally circulating fluidized bed. The experimental rig used in this study ran either as a dense fluidized bed or as a fast internally circulating fluidized bed. The effect of operating parameters, such as bed temperature (ranging from 750 to 850 °C), steam gas velocity (between 3 and 9.5 times the minimum fluidization velocity of bed material), steam to biomass mass ratio (ranging from 0.7 to 5.6 kg.kg−1) and biomass shape (sawdust and pellets) is investigated in both dense and fast internally circulating fluidized bed with olivine as bed material. In addition, the effect of bed material nature (olivine and sand) is also studied. Results indicated that syngas composition is strongly dependent on steam to biomass mass ratio. Moreover, it was found that syngas yield is favored by rising bed temperature and steam to biomass mass ratio while it is disadvantaged when fluidizing gas velocity increases. In addition, a greater syngas yield was obtained with olivine particles, compared to sand particles. The effect of bed material circulation flow rate was also investigated in fast internally circulating fluidized bed. Results showed that an increase in this parameter leads to a lower syngas yield. Finally, the experimental results presented in this paper were compared to ones reported in the literature and a good agreement was found.

中文翻译：

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榉木密实快速内循环流化床气化

本研究旨在提高对密集快速内循环流化床中生物质热化学转化的理解。本研究中使用的实验装置既可以作为密集流化床运行，也可以作为快速内部循环流化床运行。操作参数的影响，例如床温（范围为 750 至 850 °C）、蒸汽气速（介于床料最小流化速度的 3 至 9.5 倍之间）、蒸汽与生物质质量比（范围为 0.7 至 5.6 kg） .kg-1) 和生物质形状（锯末和颗粒）在以橄榄石为床材料的密集和快速内循环流化床中进行了研究。此外，还研究了床层材料性质（橄榄石和沙子）的影响。结果表明合成气成分强烈依赖于蒸汽与生物质的质量比。而且，结果表明，提高床温和蒸汽与生物质质量比有利于合成气产率，而当流化气体速度增加时则不利。此外，与砂粒相比，橄榄石颗粒获得了更高的合成气产量。在快速内循环流化床中还研究了床料循环流量的影响。结果表明，该参数的增加导致合成气产率降低。最后，将本文中提出的实验结果与文献中报道的结果进行了比较，发现了良好的一致性。与沙粒相比。在快速内循环流化床中还研究了床料循环流量的影响。结果表明，该参数的增加导致合成气产率降低。最后，将本文中提出的实验结果与文献中报道的结果进行了比较，发现了良好的一致性。与沙粒相比。在快速内循环流化床中还研究了床料循环流量的影响。结果表明，该参数的增加导致合成气产率降低。最后，将本文中提出的实验结果与文献中报道的结果进行了比较，发现了良好的一致性。