School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China.
Bioresour Technol. 2022 Feb;345:126346. doi: 10.1016/j.biortech.2021.126346. Epub 2021 Nov 29.
The torrefaction pretreatment is of great significance to the efficient conversion of biomass residues into bioenergy. In this study, the effects of the three torrefaction temperatures (200, 250, and 300 °C) on the pyrolysis performance and products of coffee grounds (CG) were quantified. The torrefaction treatment increased the initial devolatilization and maximum peak temperatures of the CG pyrolysis. Activation energy of CG250 was lower than that of CG and more conducive to the pyrolysis. Torrefaction altered the distributions of the pyrolytic products and promoted the generation of C=C. Torrefaction changed the composition ratio of the pyrolytic bio-oils although cyanoacetic acid and 2-butene still dominated the bio-oils. The joint optimization pointed to pyrolysis temperature > 600 °C and torrefaction temperature ≤ 270 °C as the optimal conditions. Our experimental results also verified that torrefaction of CG may be more suitable at 200 and 250 °C than 300 °C.
热解预处理对生物质残渣高效转化为生物能源具有重要意义。本研究定量研究了三种热解温度（200、250 和 300℃）对咖啡渣（CG）热解性能和产物的影响。热解处理提高了 CG 热解的初始挥发分释放和最大峰值温度。CG250 的活化能低于 CG，更有利于热解。热解改变了热解产物的分布，促进了 C=C 的生成。热解改变了热解生物油的组成比例，尽管氰基乙酸和 2-丁烯仍占主导地位。联合优化指出，热解温度＞600℃和热解温度≤270℃为最佳条件。我们的实验结果还验证了 CG 的热解在 200 和 250℃可能比 300℃更合适。
