The kinetics and thermal behaviors of cow manure (CM) and Meihuajing bituminous coal (MHJ) blending from room temperature to 950°C were investigated by thermal gravimetric analyzer (TGA) coupled with differential scanning calorimetry (DSC) and mass spectrometer (MS). TG curves show that the high heating rate accelerates thermal decomposition rate, and the position of differential thermal gravity (DTG) peaks shifts to a higher temperature. Owing to the heat transfer limitation phenomenon, the residual weight of CM is only 40.38% with the heating rate of 1°C/min in comparison with other heating rate. DSC takes more time to reach a steady state than TGA. Gaseous evolution curves of HCN and NH₃ were obtained during the pyrolysis of blends based on TG–MS experiments. With the increased heating rate, the emissions increased a lot due to the secondary reaction of volatiles. The E_α of 1C1M obtained using Kissinger–Akahira–Sunose (KAS), Flynn–Wall–Ozawa (FWO), Friedman, and Kissinger methods is within 124.58–317.18, 121.97–321.11, 150.28–331.64, and 209.26 kJ/mol, respectively. The kinetic parameters calculated based on four model-free kinetic modeling methods shows good agreement. And the thermodynamic parameters were obtained and discussed under different conversion rates. This work is greatly important to understand the co-prolysis mechanism of CM and coal and to design the pyrolysis reactors.

中文翻译：

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牛粪和煤共热解过程中的热转化行为和含氮气体演化：热重分析仪/差示扫描量热-质谱仪研究

采用热重分析仪（TGA）结合差示扫描量热法（DSC）和质谱仪（MS）研究了牛粪（CM）和梅花井烟煤（MHJ）在室温至950°C混合的动力学和热行为。TG曲线表明，高加热速率加速了热分解速率，差热重力（DTG）峰的位置向更高温度移动。由于传热限制现象，与其他加热速率相比，在1℃/min的加热速率下，CM的残余重量仅为40.38%。DSC 比 TGA 需要更多的时间才能达到稳定状态。HCN和NH _{3 的}气体演化曲线是在基于 TG-MS 实验的共混物热解过程中获得的。随着升温速率的提高，挥发物的二次反应导致排放量增加很多。使用 Kissinger-Akahira-Sunose (KAS)、Flynn-Wall-Ozawa (FWO)、Friedman 和 Kissinger 方法获得的 1C1M的E _α在 124.58-317.18、121.97-321.11、150.28-3220 和 kmol/J 之间分别。基于四种无模型动力学建模方法计算的动力学参数显示出良好的一致性。并得到并讨论了不同转化率下的热力学参数。这项工作对于理解煤和煤的共裂解机理以及设计热解反应器非常重要。