五彩湾煤和吐鲁番煤热解动力学模型评估与应用

煤热解是煤热加工利用的基础反应，热解动力学模型有助于预测煤在热解过程中挥发分脱除规律，当前文献中已报道了多种热解动力学模型，厘清不同热解模型参数选择的差异，评估不同模型对煤种及热解反应适应性可为热解工艺设计提供参考。采用¹³C NMR核磁共振测量了五彩湾煤和吐鲁番煤的碳化学结构，并使用热重法测量了不同加热速率下的两种低阶煤失重曲线，结合分段式单一速率扫描法、等转化率法和3段式高斯分布活化能模型（3-DAEM）分析热重实验数据。结果表明单一速率扫描法得出的动力学参数难以准确揭示热解反应机理；等转化率法可以较好地得出热解活化能及指前因子分布图；将等转化率方法获得的指前因子赋值给分布活化能模型，可以避免分布活化能模型指前因子选择的盲目性；3-DAEM模型仅需要一条TGA曲线便可获得适用于整个加热速率的动力学参数，其预测结果与实验数据吻合最好，且模拟得出的活化能分布图很好地反映了煤热解三个阶段特征。

Evaluation and application of pyrolysis kinetic model of Wucaiwan coal and Tulufan coal

To clarify the differences in parameters selection of different pyrolysis models and evaluate the adaptability of different models to pyrolysis reaction, the segmented single scanning rate method, iso-conversion kinetic method and the 3-stage Gaussian distribution activation energy model (3-DAEM) were applied to analyze the thermogravimetric experimental data of two low-rank coal. The results show that the kinetic parameters obtained by single scanning rate method cannot reveal the pyrolysis reaction mechanism well. The iso-conversion kinetic method can better obtain the activation energy and pre-exponential factor distribution. The data simulated by 3-DAEM fits best with experimental data, and only one TGA curve is needed to obtain the kinetic parameters suitable for the TGA curve at other heating rates. According to the activation energy distribution, coal pyrolysis can be divided into three stages corresponding to the three classes of dominant chemical bonds.