Wu Yonglin, Jiang Ming, Liu Yichun, Deng Yishu
College of Resources and Environment, Yunnan Agricultural University, Kunming, 650201, China.
College of Architecture and Engineering, Yunnan Agricultural University, Kunming, 650201, China.
Heliyon. 2024 Aug 14;10(16):e36293. doi: 10.1016/j.heliyon.2024.e36293. eCollection 2024 Aug 30.
To investigate the pyrolysis reaction of ryegrass, we conducted a simultaneous thermal analysis using thermogravimetric(TG) analyzers. This involved obtaining data through Thermogravimetry (TG), Derivative Thermogravimetry (DTG), and Differential thermal analysis (DTA) techniques. The experiments were conducted under dynamic nitrogen and air atmospheres at different heating rates. The kinetic parameters of ryegrass pyrolysis were determined using the Kissinger method, the Flynn-Wall-Ozawa (FWO) peak conversion rate approximate equivalence method, the Flynn-Wall-Ozawa (FWO) equal conversion rate method, and the Škvára-Šesták (S-S) method. It provides a theoretical basis for the reuse of ryegrass resources. The findings indicated that the pyrolysis temperature of ryegrass increased with the accelerated rate of temperature increase in both atmospheres. The average weight loss rate of pyrolysis of ryegrass in the air atmosphere (92.27 %) is higher than that compared to that in a nitrogen atmosphere (86.11 %). Additionally, the temperature required for complete decomposition is lower in the former case. The FWO peak conversion rate approximation equivalence approach and the FWO equal conversion rate method do not apply to the solution of the pyrolysis activation energy of ryegrass. The pyrolysis activation energy for the two decomposition stages, as calculated by the Kissinger method, is 165.73 and 185.86 kJ/mol in the air atmosphere, and 219.99 and 277.02 kJ/mol in a nitrogen atmosphere, respectively. The activation energy and mechanism function of ryegrass pyrolysis calculated by using the S-S method are as follows: [-ln(1-α)], 119.79, 104.31, 95.75, and 91.93 kJ/mol in air atmosphere, (1-α), 176.64, 67.89, 61.15, and 54.25 kJ/mol in nitrogen atmosphere, respectively. The activation energy of ryegrass pyrolysis, as determined by both the Kissinger method and S-S method, was found to be higher under an air atmosphere compared to a nitrogen atmosphere.
为了研究黑麦草的热解反应，我们使用热重（TG）分析仪进行了同步热分析。这包括通过热重法（TG）、微商热重法（DTG）和差示热分析法（DTA）技术获取数据。实验在动态氮气和空气气氛下以不同的加热速率进行。使用基辛格法、弗林-沃尔-小泽（FWO）峰值转化率近似等效法、弗林-沃尔-小泽（FWO）等转化率法和什克瓦拉-谢斯塔克（S-S）法确定了黑麦草热解动力学参数。这为黑麦草资源的再利用提供了理论依据。研究结果表明，在两种气氛中，黑麦草的热解温度均随升温速率加快而升高。黑麦草在空气气氛中的热解平均失重率（92.27%）高于在氮气气氛中的失重率（86.11%）。此外，前一种情况下完全分解所需的温度较低。FWO峰值转化率近似等效法和FWO等转化率法不适用于求解黑麦草热解活化能。用基辛格法计算的两个分解阶段在空气气氛中的热解活化能分别为165.73和185.86kJ/mol，在氮气气氛中分别为219.99和277.02kJ/mol。用S-S法计算的黑麦草热解活化能和机理函数如下：在空气气氛中为[-ln(1-α)]，119.79、104.31、95.75和91.93kJ/mol，在氮气气氛中为(1-α)，176.64、67.89、61.15和54.25kJ/mol。通过基辛格法和S-S法确定的黑麦草热解活化能在空气气氛中高于氮气气氛。
