Abstract The study of energy and exergy balance in the gasification of beech wood was performed using a pilot-scale fluidized bed reactor at different operation conditions. The temperature range studied was from 600 °C to 900 °C, with the use of CO2 and steam as gasification agents and biochar and sand as bed materials. The singularity of this work was the combination of an experimental work and a complete evaluation of the exergy distribution of beech wood gasification based on strict use of the same experimental set-up, but varying the operating conditions. Also, a detailed analysis of pyrolysis products was taken into consideration. Temperature increase had a negative influence on exergy destruction. When sand was used as the bed material, the exergy destruction rate increased from 9 to 13% of the total exergy entering the system. Comparing pyrolysis and gasification with CO2 under the same conditions, it was found that the pyrolysis reaction destroyed more exergy than gasification. Steam showed lower exergy destruction rate than CO2 gasification when biochar was used as bed material for tar cracking. This means that more exergy was conserved in steam gasification reaction, even though syngas efficiency was to 65% for both set-ups.

中文翻译：

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以CO2或水蒸气为气化剂的流化床反应器中榉木气化的有效研究

摘要 使用中试规模的流化床反应器在不同操作条件下对榉木气化过程中的能量和火用平衡进行了研究。研究的温度范围为 600 °C 至 900 °C，使用 CO2 和蒸汽作为气化剂，使用生物炭和沙子作为床层材料。这项工作的独特之处在于结合了实验工作和基于严格使用相同实验装置但改变操作条件对山毛榉木材气化的火用分布的完整评估。此外，还考虑了对热解产物的详细分析。温度升高对火用破坏有负面影响。当使用沙子作为床层材料时，火用破坏率从进入系统总火用的 9% 增加到 13%。比较相同条件下与CO2的热解和气化，发现热解反应比气化破坏更多的火用。当使用生物炭作为焦油裂解床料时，蒸汽显示出比 CO2 气化更低的火用破坏率。这意味着在蒸汽气化反应中保存了更多的火用，即使两种设置的合成气效率都达到了 65%。