文章基本信息

标题：Analysis of mixed cattle manure: Kinetics and thermodynamic comparison of pyrolysis and combustion processes
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作者：Muhammad Ashraf ; Naveed Ramzan ; Rafi Ullah Khan 等
期刊名称：Case Studies in Thermal Engineering
印刷版ISSN：2214-157X
电子版ISSN：2214-157X
出版年度：2021
卷号：26
页码：101078
DOI：10.1016/j.csite.2021.101078
出版社：Elsevier B.V.
摘要：The study investigates the non-isothermal thermogravimetric analysis of cattle manure at varied heating rates to compare the kinetic and thermodynamic behaviors of cattle manure in N 2 and air atmospheres. The Thermogravimetric (TG) curves indicated that the decomposition of the manure can be divided into three different regions. Exclusive of stage I (dehydration), the activation energy (Ea) values of stage II (devolatilization) for all model-free methods varied between 144 - 270 and 32–227 kJ/mol in pyrolysis and combustion respectively. While in stage III, Ea values varied in ranges of 49–336 kJ/mol and 71–136 kJ/mol for pyrolysis (carbonation) and combustion (char burning), respectively. The overall average Ea for the pyrolysis (≈146 kJ/mol) is higher than the combustion process (≈127 kJ/mol). The variation in the values of frequency factor “ A” also indicated the complexity of both processes. Pyrolysis followed overall 2-Diffusion (D 2 ) reaction models, while combustion followed 3-Power law (P 3 ) and reaction Order-1 (O 1 ) in stage II and III respectively. The thermodynamic study was also conducted to evaluate the important parameters, change in Enthalpy change (ΔH), Gibbs free energy (ΔG), and Entropy (ΔS).
关键词：Dairy manure ; Pyrolysis ; Combustion ; Kinetics ; Isoconversional methods ; Coats-Redfern method