油砂及其热解半焦的燃烧研究

通过X-射线衍射(XRD)对油砂、其热解半焦以及两者燃烧灰样的物相进行了分析，利用氮气等温吸脱附研究了灰样表明特性，采用热重分析法对比了油砂和半焦的燃烧特性，并借助平行反应模型进行了动力学分析。结果表明油砂和热解半焦中所含矿物质主要为方解石，其分解温度主要在873-973 K内。灰样的分形维数D、孔容积和BET比表面积随燃烧温度变化的趋势相近。TG-DTG曲线表明油砂在低温段有明显的燃烧失重趋势，而焦炭不明显，但两者在高温段的失重过程相似，同时油砂着火及燃烧性能比半焦高。平行反应模型可以很好地描述油砂及半焦的燃烧过程，两者动力学模型有一定相似性；半焦燃烧的平均表观活化能Em比油砂高，反应活性较低。

Study on the Combustion of Oil Sand and Pyrolysis Semi-Coke

The mineral component structure of oil sand, pyrolysis semi-coke of oil sand and their ash were analyzed by X-ray Diffraction(XRD). The surface characteristics of ash was studied by the N2 isothermal adsorption-desorption method. The combustion characteristics of oil sand and semi-coke were compared by thermogravimetric analysis method. The combustion kinetics were researched by parallel reaction model. The results show that the mineral component of oil sand and semi-coke are mainly composed of calcite, and the decomposition of it mainly occurred at 873-973 K. The tendencies of Fractal dimension(D), pore volume and BET surface area of ash towards the combustion temperature are consistent. The TG-DTG curves reveal that the rate of mass loss of oil sands is more obvious than that of semi-coke in low temperature range, but the mass-loss process of oil sands is similar to that of semi-coke in high temperature range. The ignition and combustion characteristics of oil sands are better than that of semi-coke. The parallel reaction model is agreed well with experimental data. To some degree, the kinetic model of oil sands is similar to that of semi-coke. The semi-coke has higher mean apparent activation energy(Em) and lower reaction reactivity than that of oil sand.