Karuppasamy Vikraman V, Praveen Kumar D, Boopathi G, Subramanian P
Department of Renewable Energy Engineering, Agricultural Engineering College and Research Institute, Tamil Nadu Agricultural University, Coimbatore, Tamil Nadu 641003, India.
Department of Agricultural Engineering, Amrita School of Agricultural Sciences, Amrita Vishwa Vidyapeetham, Coimbatore, Tamil Nadu 642109, India.
Bioresour Technol. 2021 Dec;342:125992. doi: 10.1016/j.biortech.2021.125992. Epub 2021 Sep 21.
Pyrolysis kinetics of finger millet straw (FMS) was studied using a thermogravimetric analyzer under N environment. Physico-chemical characteristics of FMS were comparable with the established pyrolysis feedstocks. FMS thermally decomposed in three stages: drying, active pyrolysis, and char formation resulting in 70.37% overall weight loss. Average activation energy determined by Friedman and Starink methods was 177.80 and 172.18 kJ mol, respectively. Frequency factor was found to be in the range of 10 to 10. Reaction pathway followed diffusion, nucleation, and order-based mechanisms. The pyrolysis of FMS was characterized by empirical modeling and predicted well with model adequacy of 97.55%. Thermodynamic parameters (ΔG and ΔH) revealed the non-spontaneous and endothermic nature of FMS pyrolysis. The biochar obtained at multiple heating rates were characterized for its physicochemical, functional, and morphological characteristics. The kinetic and thermodynamic analyses illustrate the feasibility of exploiting finger millet straw as a pyrolysis feedstock to derive biofuels.
在氮气环境下，使用热重分析仪研究了龙爪稷秸秆（FMS）的热解动力学。FMS的物理化学特性与既定的热解原料相当。FMS经历三个热分解阶段：干燥、活性热解和炭形成，总失重率达70.37%。通过弗里德曼法和斯塔林克法确定的平均活化能分别为177.80和172.18 kJ/mol。频率因子在10至10范围内。反应途径遵循扩散、成核和基于有序的机制。FMS的热解通过经验模型进行表征，模型适配度为97.55%时预测效果良好。热力学参数（ΔG和ΔH）揭示了FMS热解的非自发和吸热性质。对在多个加热速率下获得的生物炭进行了物理化学、功能和形态特征表征。动力学和热力学分析表明，将龙爪稷秸秆用作热解原料来生产生物燃料是可行的。
