Abstract This study investigated the effects of various bed materials (silica, biomass-based activated carbon, coal-based activated carbon, and zeolite) used in the second-stage reactor and different gasification conditions on the H2 fraction in the syngas. The equivalence ratio was fixed at 0.3, and the temperature in the first-stage reactor was held constant at 500 °C. Three temperatures were tested in the second-stage reactor, and the steam/biomass ratio was also tested. As shown in the experimental results, the combination of operating temperatures that gives the optimum percentage of H2 in the syngas is 500 °C/900 °C. The highest proportion of H2 formed at S/B = 0.6. As steam passes into the first-stage reactor, the operating temperature and, subsequently, the gasification efficiency can be lowered. The higher operating temperature of the second-stage reactor nevertheless reintroduced steam into the gasification reaction as it entered, raising the H2 content significantly. In addition, for the different bed materials used in the second stage, B-AC yielded the highest proportion of H2 in the syngas exiting the gasifier. The H2 fraction reached 50.96 mol% when S/B = 0.6 and the operation was carried out at 500 °C/900 °C. Among the four different bed materials, silica yielded the lowest H2 proportion of 36.66 mol%.

中文翻译：

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二级床层材料对二级气化工艺合成气制氢的影响

摘要 本研究调查了二级反应器中使用的各种床层材料（二氧化硅、生物质基活性炭、煤基活性炭和沸石）和不同气化条件对合成气中 H2 馏分的影响。当量比固定为 0.3，第一级反应器中的温度保持恒定在 500 °C。在二级反应器中测试了三个温度，还测试了蒸汽/生物质比。如实验结果所示，合成气中 H2 最佳百分比的操作温度组合为 500 °C/900 °C。在 S/B = 0.6 时形成的 H2 比例最高。当蒸汽进入第一级反应器时，操作温度和随后的气化效率会降低。然而，第二阶段反应器较高的操作温度将蒸汽重新引入气化反应中，从而显着提高了 H2 含量。此外，对于第二阶段使用的不同床层材料，B-AC 在离开气化器的合成气中产生最高比例的 H2。当 S/B = 0.6 时，H2 分数达到 50.96 mol%，操作温度为 500 °C/900 °C。在四种不同的床材料中，二氧化硅产生的 H2 比例最低，为 36.66 mol%。6和操作在500℃/900℃下进行。在四种不同的床材料中，二氧化硅产生的 H2 比例最低，为 36.66 mol%。6和操作在500℃/900℃下进行。在四种不同的床材料中，二氧化硅产生的 H2 比例最低，为 36.66 mol%。