气体加压热解木质纤维素固体废弃物：低温脱氧和化学结构演变机制。
Gas-pressurized torrefaction of lignocellulosic solid wastes: Low-temperature deoxygenation and chemical structure evolution mechanisms.
机构信息
State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
出版信息
Bioresour Technol. 2023 Oct;385:129414. doi: 10.1016/j.biortech.2023.129414. Epub 2023 Jun 28.
A novel gas-pressurized (GP) torrefaction realizes deeper deoxygenation of lignocellulosic solid wastes (LSW) to as high as 79% compared to traditional torrefaction (AP) with the oxygen removal of 40% at the same temperature. However, the deoxygenation and chemical structure evolution mechanisms of LSW during GP torrefaction are currently unclear. In this work, the reaction process and mechanism of GP torrefaction were studied through follow-up analysis of the three-phase products. Results demonstrate gas pressure causes over 90.4% of cellulose decomposition and the conversion of volatile matter to fixed carbon through secondary polymerization reactions. Above phenomena are completely absent during AP torrefaction. A deoxygenation and structure evolution mechanism model is developed through analysis of fingerprint molecule and C structure. This model not only provides theoretical guidance for optimization of the GP torrefaction, but also contributes to the mechanism understanding of pressurized thermal conversion processes of solid fuel, such as coal and biomass.
一种新型的气体加压（GP）热解技术可实现比传统热解（AP）更高的木质纤维素固体废料（LSW）脱氧程度，高达 79%，而在相同温度下，AP 的脱氧程度仅为 40%。然而，LSW 在 GP 热解过程中的脱氧和化学结构演变机制目前尚不清楚。在这项工作中，通过对三相产物的后续分析，研究了 GP 热解的反应过程和机制。结果表明，气压导致超过 90.4%的纤维素通过二次聚合反应分解，挥发分转化为固定碳。而在 AP 热解过程中，这些现象完全不存在。通过对指纹分子和 C 结构的分析，建立了脱氧和结构演变机制模型。该模型不仅为 GP 热解的优化提供了理论指导，而且有助于理解煤和生物质等固体燃料的加压热转化过程的机制。
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