基于双组分模型的棉秆催化热解动力学方法研究

KINETIC STUDY ON CATALYTIC PYROLYSIS OF COTTON STALK BASED ON TWO-PSEUDOCOMPONENT MODEL

基于双组分模型,分别利用改良Coats-Redfern积分法和Vachuska-Voboril微分法分析了棉秆催化热解的失重动力学。研究表明:棉秆催化热解过程均由失水区、活化热解区(APS)和消极热解区(PPS)构成,纯棉秆热解时的PPS不明显。改良Coats-Redfern积分法和Vachuska-Voboril微分法均适用于基于双组分模型的棉秆催化热解动力学分析,但改良Coats-Redfern积分法的拟合结果更接近于实验数据。催化剂的加入显著促进了PPS组分的热解,在所选用催化剂中,MCM-41催化活性最高。

Improved Coats-Redfern integration and Vachuska-Voboril differentiation were used to simulate the kinetics of cotton stalk catalytic pyrolysis respectively based on two-pseudocomponent model. The results showed that the catalytic pyrolysis experienced three stages： water losing stage, activated pyrolysis stage （APS）, passive pyrolysis stage （PPS）. PPS for pyrolysis of pure cotton stalk was small. Improved Coats-Redfem integration and Vachuska-Voboril differentiation were fit for the kinetic study of cotton stalk catalytic pyrolysis both. However, the fitting results of improved Coats-Redfern integration were more close to experimental date than the fitting by Vachuska-Voboril differentiation. The adding of catalysts promoted the pyrolysis of the component of PPS, and MCM-41 showed the best catalytic performance among the catalysts chosen.