Kinetics and thermodynamic analysis of maize cob pyrolysis for its bioenergy potential using thermogravimetric analyzer
Kinetics and thermodynamic analysis of maize cob pyrolysis for its bioenergy potential using thermogravimetric analyzer
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DOI：
10.1007/s10973-019-08053-7
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发表时间：
2019-08-01
影响因子：
4.4
通讯作者：
Mondal, Monoj Kumar
中科院分区：
文献类型：
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作者：
Gupta, Goutam Kishore;Mondal, Monoj Kumar
研究了玉米棒的热降解行为，以了解其热解生产生物质能源的特性。在热降解之前，进行了初步表征（工业分析、元素分析和HHV），以检查其对热解过程的适用性。随后，在具有惰性气氛的热重分析仪中以三种不同的缓慢加热速率（5、10和20 ℃ min（-1））从环境温度至900 ℃进行热重实验。热重结果证实，最大脱挥发分发生在200-460 ℃的温度范围内。在动力学和热力学研究中，采用了Friedman、FWO、KAS和Starink四种等转化率模型，计算出的平均活化能分别为197.63、186.06、185.39和185.80 kJ mol（-1）。反应活化能与反应焓之间的位能垒（* 4-6 kJ mol（-1））揭示了产物生成的有利条件。KAS法和Friedman法测得玉米芯的吉布斯自由能变化（DG）分别为174.91 ~ 179.47 kJ mol（-1）和174.27 ~ 180.23 kJ mol（-1）。因此，动力学和热力学数据沿着HHV（15.27 MJ kg（-1））表明，玉米棒具有足够的潜力，可用于生物能源生产。
The purpose of the study was to inspect the thermal degradation behavior of maize cob to find out its pyrolytic behavior for bioenergy generation. Prior to thermal degradation, the initial characterizations (proximate analysis, ultimate analysis and HHV) were done to check its suitability toward pyrolysis process. Later, thermogravimetric experiments were performed from ambient temperature to 900 degrees C at three different slow heating rates (5, 10 and 20 degrees C min(-1)) in a thermogravimetric analyzer with inert atmosphere. Thermogravimetric results confirmed that maximum devolatilization occurred at the temperature range of 200-460 degrees C. For kinetic and thermodynamic studies, four iso-conversional models (Friedman, FWO, KAS and Starink) were applied and average activation energies calculated from these models were 197.63, 186.06, 185.39 and 185.80 kJ mol(-1), respectively. The potential energy barrier between activation energy and enthalpy of reaction (* 4-6 kJ mol(-1)) revealed the favorable conditions for product formation. Gibbs free energy change (DG) for maize cob was found in the range of 174.91 to 179.47 kJ mol(-1) and 174.27 to 180.23 kJ mol(-1) for KAS and Friedman methods, respectively. Thus, kinetic and thermodynamic data along with HHV (15.27 MJ kg(-1)) showed that maize cob had enough potential to be utilized for bioenergy production.