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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(differential thermogravimetric,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。
Thermal analysis of the combustion characteristics of oil sands. The thermogravimetric (TG) and differential thermogravimetric (DTG) curves were obtained under the conditions of 10, 20 and 50 ℃ / min respectively. Based on the TG-DTG curve, the combustion parameters of oil sands were obtained. The effects of heating rate and particle size on the combustion characteristics were investigated. The combustion kinetics parameters of oil sands were obtained by the CR method and the FWO method and the DEAM method commonly used in a single scanning rate method. The results show that oil sands have the advantages of easy ignition, low ignition temperature and high temperature combustion reaction Strong combustion characteristics. Oil sand burning is divided into three stages: burning low temperature section, transition section, high temperature section. The fitting results of these three models are very high. The CR results show that different reaction stages of oil sand combustion can be described by different reaction orders. The results of DEAM and FWO can better reflect the instantaneity of combustion, the activation energy In the combustion of low temperature and high temperature gradually increased, the activation energy changes in the combustion transition is more gentle.