油砂流化热转化过程中结焦热载体的烧碳动力学

 采用固定床微分反应器——气相色谱联用装置，对油砂流化热转化过程中的结焦热载体进行了烧碳动力学及烧焦工艺条件的研究。结果表明，结焦热载体烧碳反应速率与碳的质量分数符合2级反应动力学规律，与氧分压符合1级反应动力学规律，可用阿累尼乌斯公式表示反应速率与烧焦温度的关系。结焦热载体烧碳反应对碳的反应级数与 FCC 催化剂烧碳再生反应对碳的反应级数不同，其活化能 Ea远小于 FCC 催化剂烧碳再生等过程的活化能，主要是由于结焦热载体中的碱土金属加快了烧碳过程的反应速率，改变了碳的反应级数，降低了该反应过程的活化能。烧焦产物中 n(CO₂)/n(CO)仅是温度的函数，在600~720℃随着烧焦温度的升高 n(CO₂)/n(CO)降低；当温度高于720℃时，随着温度的升高，n(CO₂)/n(CO)显著增大。

Coke Combustion Kinetics of Hot Carrier in Fluid Thermal Conversion of Oil Sand

The coke combustion of hot carrier in fluid thermal conversion of oil sand was studied in a fixed bed microreactor,and the apparent kinetic equation and process conditions for coke combustion were obtained.The results showed that the coke combustion rate was in second order with respect to carbon mass fraction and in first order with respect to oxygen partial pressure,and the relation of reaction rate constant and temperature was consistent with Arrhenius equation.The reaction order of carbon in coke combus...