Investigation on direct deoxygenation of bio-oil during biomass fast pyrolysis with CaO in a fluidized bed reactor
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摘要: 在小型流化床反应器中，对CaO伴随生物质快速热裂解制油过程中的直接脱氧效果进行了研究。当反应温度为520℃、载气流量8000L/h时，在纯白松粉末和CaO伴随条件下分别制出了生物油样品。实验结果表明，当采用纯白松与CaO/白松质量比分别为1、2、4时，生物油样品中有机组分的含氧量依次为39.38%、39.15%、39.04%和32.29%；在CaO/白松质量比为4时，生物油有机组分含氧量的下降幅度达18.0%（相对变化）。GC-MS分析结果表明，CaO加入后左旋葡聚糖和甲酸、乙酸等高含氧量物质相对含量明显下降，证实了CaO伴随生物质热裂解过程中“富氧中间体”固氧路径的存在；与此同时，糠醛类等主要来源于脱水反应的产物相对含量上升，说明CaO的加入也促进了脱水反应的发生。Abstract: Direct deoxygenation effect of CaO on bio-oil from biomass pyrolysis was studied in a fluidized bed experimental apparatus. Bio-oil was produced at reaction temperature of 520℃ and carrier-gas flow-rate of 8000L/h using white pine alone and white pine accompanied with CaO, respectively. The result shows that the oxygen contents of the organic components in the bio-oils are 39.38%, 39.15%, 39.04% and 32.29% for white pine alone and white pines with 1, 2, 4 times of CaO added, respectively. With 4 times CaO added, the oxygen content of the organic components decreases by 18.0% (relative variation). Detailed GC-MS analysis indicates that the relative contents of high-oxygen containing levoglucosan, formic acid, acetic acid, etc. are greatly reduced with CaO-adding, implying the existence of the oxygen-capture path of “high-oxygen containing intermediates” in biomass pyrolysis process. Furthermore, the species of furfural is derived from dehydration reactions, and the increase in the relative content demonstrates that CaO-adding can also catalyze the dehydration reactions.
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