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温度对麦秆湿解产物特性的影响

DOI: 10.13334/j.0258-8013.pcsee.2014.26.009, PP. 4508-4514

Keywords: 湿解,温度,麦秆,物化结构,浓度分布

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Abstract:

湿解是一种模拟自然煤化的热化学转化工艺,为研究生物质湿解过程中产物的物化特性,该文以麦秆为原料,在高压反应釜中,进行了反应温度160~240℃,停留时间60min条件下的湿解实验。研究发现,随温度的升高,固体产物产率逐渐减少,而液体产物产率增加,且在高于220℃以后,变化速度加快,如以生产固体生物炭为主,温度应控制在220℃左右。固体产物中有机官能团随温度的升高而减少,而碳碳双键、羰基和难降解的芳环结构,随温度的升高,红外吸收加强;固体表面的孔隙和微球显示其具有生物炭的结构;200℃的固体产物展现出相对较好的热稳定性。液体产物中含有还原性糖、乙酸、糠醛、5-羟甲基糠醛和5-甲基糠醛,其中还原性糖浓度较高,可以作为液体燃料的原料,随温度的升高,还原糖浓度逐渐增加,200℃后,浓度变化不大。

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