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Effect of wet torrefaction on pyrolysis kinetics and conversion of microalgae carbohydrates, proteins, and lipids
Energy Conversion and Management ( IF 10.4 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.enconman.2020.113609
Yong Yang Gan , Wei-Hsin Chen , Hwai Chyuan Ong , Yu-Ying Lin , Herng-Kuang Sheen , Jo-Shu Chang , Tau Chuan Ling

Abstract The experimental results of microalgae pyrolysis kinetics are beneficial to the reactor design in the biomass-to-energy process. To understand the complex pyrolysis process of microalgae, pyrolysis kinetics of microalgae components pretreated by wet torrefaction was evaluated using the independent parallel reaction model. Four and five reaction models were implemented to analyze the pyrolysis kinetics of microalgae Chlorella vulgaris ESP-31 (high-carbohydrate) and FSP-E (high-protein), respectively. Five pseudo-components were required to investigate the microalga FSP-E due to the extra carbonaceous material at temperatures higher than 600 °C. In the pyrolysis TGA curves, the first peak of microalga ESP-31 was diminished whereas only a slight decrease in the first peak of microalga FSP-E for the pretreated microalgae in water and H2SO4 solutions. From the results, pyrolysis kinetics with a fit quality of at least 97% was predicted for both species of microalgae. The activation energy of carbohydrates for microalga ESP-31 was decreased from 221.33 to 64.59 kJ mol−1 after pretreated in H2SO4. In contrast, the activation energies of proteins and lipids were increased for the pretreated microalgae ESP-31. Small changes in the activation energy range of carbohydrates, lipids, and other components were observed for microalga FSP-E compared to microalga ESP-31. On top of that, the thermal degradation temperatures and activation energies of carbohydrates and proteins for the pretreated microalgae ESP-31 and FSP-E displayed the opposite trend. In short, kinetic parameters of microalga ESP-31 could be effectively affected by low-temperature wet torrefaction compared to microalga FSP-E.

中文翻译:

湿式烘焙对微藻碳水化合物、蛋白质和脂质的热解动力学和转化的影响

摘要 微藻热解动力学实验结果有利于生物质能源化过程中的反应器设计。为了了解微藻的复杂热解过程,使用独立平行反应模型评估了湿式烘焙预处理的微藻成分的热解动力学。分别实施了四个和五个反应模型来分析微藻小球藻 ESP-31(高碳水化合物)和 FSP-E(高蛋白)的热解动力学。由于在高于 600 °C 的温度下含有额外的碳质材料,因此需要五种假组分来研究微藻 FSP-E。在热解 TGA 曲线中,对于在水和 H2SO4 溶液中预处理的微藻,微藻 ESP-31 的第一个峰减弱,而微藻 FSP-E 的第一个峰仅略有下降。根据结果​​,预测两种微藻的热解动力学拟合质量至少为 97%。在 H2SO4 中预处理后,微藻 ESP-31 碳水化合物的活化能从 221.33 降低到 64.59 kJ mol-1。相比之下,预处理过的微藻 ESP-31 的蛋白质和脂质的活化能增加。与微藻 ESP-31 相比,微藻 FSP-E 的碳水化合物、脂质和其他成分的活化能范围发生了微小变化。最重要的是,预处理后的微藻ESP-31和FSP-E的碳水化合物和蛋白质的热降解温度和活化能显示出相反的趋势。总之,与微藻FSP-E相比,微藻ESP-31的动力学参数可以有效地受到低温湿式烘焙的影响。
更新日期:2021-01-01
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