玉米秸秆粉闪速热解挥发特性模型

引入Arrhenius一级反应动力学模型方程,描述玉米秸秆粉闪速热解挥发特性。影响该模型动力学参数准确性的因素有挥发百分比、最终挥发百分比和颗粒停留时间。利用自行设计的层流炉装置进行热解挥发特性实验,获得了玉米秸秆粉的挥发和最终挥发百分比。利用PIV冷态实验结果,优化了热解挥发特性实验中颗粒停留时间计算方法,获得了更准确的颗粒停留时间。通过分析实验数据,得到了相应的热化学动力学参数:表观频率因子A和表观活化能E。结果表明,实验数据与模型预测数据有很好的一致性,说明所建立的模型实用性强。

Volatilization Characteristics Models of Corn Powder with Flash Pyrolysis

An Arrhenius form first order reaction kinetic model was introduced to determine volatilization characteristics of corn powders. The factors which affect the kinetic parameter of the Arrhenius model including: volatile percent, final volatile percent and residential time. A laminar entrained flow reactor (LEFR) was designed and constructed to obtain the volatile percent and final volatile percent of corn powders. Using the PIV cold test conclusion, accurate residential time of corn powders in LEFR was obtained by optimizing the calculation method. Based on experimental results, the values of frequency factor and activation energy of corn powders pyrolysis were determined. The results showed that the test values fit well with the predict values, which verified practicability of the model.