Tagade Ankita, Kandpal Saurav, Sawarkar Ashish N
Department of Chemical Engineering, Motilal Nehru National Institute of Technology Allahabad, Prayagraj 211004, Uttar Pradesh, India.
Department of Chemical Engineering, Motilal Nehru National Institute of Technology Allahabad, Prayagraj 211004, Uttar Pradesh, India.
Bioresour Technol. 2023 Oct 27:129930. doi: 10.1016/j.biortech.2023.129930.
Millets and millet crop residues are gaining increasing attention. Present work provides insights into thermal degradation characteristics, pyrolysis indices, kinetic triplets, and thermodynamic parameters for pearl millet straw (PMS) pyrolysis. Pyrolysis indices revealed suitability of higher heating rates for PMS in terms of enhanced pyrolysis performance and shorter reaction time. Combined iso-conversional techniques and distributed activation energy model (DAEM) approach was employed to study kinetics of PMS pyrolysis. Average activation energy through Kissinger-Akahira-Sunose, Flynn-Wall-Ozawa, Friedman, Starink, Vyazovkin, and DAEM was found to be 189.61, 190.84, 192.71, 187.84, 193.33, and 191.08 kJ/mol, respectively. Statistical analysis through ANOVA using Tukey test demonstrated insignificant deviation for obtained activation energies. Kinetic compensation effect was employed to determine pre-exponential factor. Master plots revealed prevalence of random nucleation (R1 and R2) for α < 0.5 and diffusion (D1) and power law (P2) models for α > 0.5. Thermodynamic parameters revealed endothermic, non-spontaneous, and high degree of randomness for PMS pyrolysis.
谷子及其作物残渣正受到越来越多的关注。目前的研究工作深入探讨了珍珠粟秸秆（PMS）热解的热降解特性、热解指数、动力学三重态和热力学参数。热解指数表明，较高的加热速率对于PMS而言，在提高热解性能和缩短反应时间方面具有适用性。采用联合等转化率技术和分布活化能模型（DAEM）方法研究PMS热解动力学。通过基辛格-赤平-ose法、弗林-沃尔-小泽法、弗里德曼法、斯塔林克法、维亚佐夫金法和DAEM法得到的平均活化能分别为189.61、190.84、192.71、187.84、193.33和191.08kJ/mol。使用Tukey检验通过方差分析进行的统计分析表明，所获得的活化能偏差不显著。采用动力学补偿效应来确定指前因子。主曲线表明，对于α<0.5，随机成核（R1和R2）占主导，对于α>0.5，扩散（D1）和幂律（P2）模型占主导。热力学参数表明PMS热解是吸热的、非自发的且具有高度随机性。
