This study presents the simulation of hydrothermal gasification (HTG) of Scenedesmus obliquus microalgae and their derivatives using Aspen Plus V11. The effect of operating parameters such as temperature, pressure, and biomass concentration on the yield and composition of gaseous products using whole algae, lipid, and lipid extracted algae (LEA) as feedstocks was examined. The results showed that reaction pressure exhibited minimal impact whereas temperature, biomass concentration, and feedstock composition had significant effects on the composition of gaseous products. It was also found that a low temperature (400 °C) and biomass concentration of 40 wt% favored the production of methane-rich gas. In contrast, high temperature (700 °C) and low biomass concentration (10 wt%) favored hydrogen-rich gas production in all the three feedstocks considered. The highest mole fraction achieved for CH₄ was 53.45, 61.70, and 52.20 mol%, which corresponded to a CH₄ yield of 31.14, 56.90, and 30.15 mmol g⁻¹ for whole algae, lipid, and LEA respectively. For H₂ rich gas production, the highest mole fractions achieved were 55.77, 52.29, and 55.34 mol%, which correspond to H₂ yields of 75.44, 105.51, and 73.49 mmol g⁻¹ for whole algae, lipids, and LEA, respectively. The ranking order for the yield and lower heating value of the product gas from the HTG process is lipid > whole algae > LEA. This study has shown that hydrogen-rich and methane-rich gas can be produced from the hydrothermal gasification of microalgae as a function of the reaction conditions and feedstock composition. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd

中文翻译：

---

斜栅藻及其衍生物的水热气化：使用 Aspen Plus 的热力学研究

本研究介绍了斜栅藻的热液气化 (HTG) 模拟微藻及其衍生物使用 Aspen Plus V11。使用全藻类、脂类和脂类提取藻类 (LEA) 作为原料，研究了操作参数（例如温度、压力和生物质浓度）对气态产品的产量和组成的影响。结果表明，反应压力的影响最小，而温度、生物质浓度和原料组成对气态产物的组成有显着影响。还发现低温 (400 °C) 和 40 wt% 的生物质浓度有利于富含甲烷的气体的生产。相比之下，高温 (700 °C) 和低生物质浓度 (10 wt%) 有利于所有三种原料中的富氢气体生产。CH ₄达到的最高摩尔分数分别为53.45、61.70和52.20 mol%，对应于全藻类、脂质和LEA的CH ₄产率分别为31.14、56.90和30.15 mmol g ^-1。对于富含H _{2 的}气体生产，实现的最高摩尔分数为55.77、52.29 和 55.34 mol%，对应于75.44、105.51 和 73.49 mmol g ^{-1 的}H ₂产率分别用于整个藻类、脂质和 LEA。来自 HTG 过程的产物气体的产率和较低热值的排序顺序是脂质 > 全藻 > LEA。该研究表明，作为反应条件和原料组成的函数，可以从微藻的水热气化中产生富氢和富甲烷气体。© 2021 化学工业协会和 John Wiley & Sons, Ltd