Investigation on the lignite pyrolysis reaction kinetics based on the general Arrhenius formula
Investigation on the lignite pyrolysis reaction kinetics based on the general Arrhenius formula
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基于一般阿伦尼乌斯公式的褐煤热解反应动力学研究
DOI：
10.1016/j.fuel.2020.117364
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发表时间：
2020-05-15
期刊：
影响因子：
7.4
通讯作者：
Hou, Baolin
中科院分区：
文献类型：
--
作者：
Lian, Wenhao;Wang, Junli;Hou, Baolin
研究反应动力学可以加深对反应机理的理解，为相关反应器的理论优化提供相对准确、高效的反应速率表达式。将复杂的褐煤热解假定为多个平行的一级反应，通过对热重(TG)实验数据的拟合，得到了各一级反应的Arrhenius方程的动力学参数。因此，我们建立的动力学模型避免了用著名的分布活化能模型计算热解速率时的多次积分，预测单个褐煤颗粒热解的计算时间从51.9S减少到3.8S，这对于从理论上优化反应器，特别是使用成熟的计算流体力学理论具有重要意义。模拟结果表明，所建立的动力学模型比DAEM模型能更准确地预测褐煤的热解过程。
Studying the reaction kinetics can deepen the understanding of reaction mechanism and provide a relatively accurate and efficient reaction rate expression to theoretically optimize the relevant reactor. Here, the complicated lignite pyrolysis was assumed to be performed by the multi-parallel first order reactions, and the kinetic parameters of Arrhenius formula for each first order reaction were obtained through fitting the thermogravimetry (TG) experimental data. Thus, our developed kinetics models can avoid the multiple integration of using the well-known distributed activation energy model (DAEM) in evaluating the pyrolysis rate, the computational time for predicting the pyrolysis in a single lignite particle is reduced from 51.9 s to 3.8 s, which is important for theoretically optimizing the reactor, especially for using the well-developed computational fluid dynamics (CFD) theory. And, the simulating results showed that the developed kinetics model can more accurately predict the lignite pyrolysis process than that of DAEM.