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三种印尼油砂燃烧特性研究

, PP. 23-30

Keywords: 油砂,燃烧反应,热分析,转化率,表观活化能

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Abstract:

采用热重分析方法研究油砂的燃烧特性。在升温速率分别为10,20,50℃/min条件下,得到了油砂燃烧失重(thermogravimetric,TG)、微商失重(differentialthermogravimetric,DTG)曲线。基于TG-DTG曲线,求得了油砂燃烧特性参数,考查了加热速率、粒径对燃烧特性的影响。采用单个扫描速率法中常用的CR法和多重扫描速率法中FWO法以及DEAM法求解了油砂的燃烧动力学参数,研究结果表明:油砂具有着火容易、着火温度低、燃烧高温段反应比较强烈等燃烧特性。油砂燃烧分为3个阶段:燃烧低温段、过渡段、高温段。这3种模型的拟合度都很高,C-R法结果表明油砂燃烧不同反应阶段可用不同的反应级数来描述;DEAM和FWO法结果能更好地反映油砂燃烧的瞬时性,活化能在燃烧低温段和高温段逐渐增加,活化能在燃烧过渡段变化较为平缓。

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