The thermal behavior during the co-combustion of bituminous coal and oil palm trunk hydrochars

Utilizing oil palm trunk (OPT) residue as a co-fuel in coal-fired plants offers an environmentally favorable solution to agricultural waste disposal and fossil fuel combustion impacts. This study investigates the potential of hydrochar from OPT (HTC-OPT) as a coal-like solid fuel for co-combustion. The combustion characteristics of coal, HTC-OPT, and their blends (10–50% HTC-OPT) were analyzed via thermogravimetric analysis with heating rates ranging from 10 to 30°C/min. The Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS) models were employed to explore co-combustion interactions and kinetic parameters. Results reveal enhanced combustion efficiency with HTC-OPT addition to coal. Higher HTC-OPT ratios correlate with increased maximum combustion rates, ignition and comprehensive combustibility indices, and decreased ignition and burnout temperatures. Additionally, blended fuels exhibit a proportionally synergistic co-combustion interaction. Both KAS and FWO models indicate similar trends in activation energies, with the lowest values (49.94 kJ/mol for KAS and 60.90 kJ/mol for FWO) at a 10% HTC-OPT ratio.

将油棕树干（oil palm trunk, OPT）残渣作为燃煤电厂的辅助燃料，可为农业废弃物处置与化石燃料燃烧的环境影响问题提供环境友好的解决方案。本研究探究了油棕树干水热炭（hydrochar from OPT, HTC-OPT）作为类煤固体燃料用于混燃的潜力。针对原煤、HTC-OPT及其掺混配比为10%~50% HTC-OPT的混合燃料的燃烧特性，本研究采用升温速率范围为10~30℃/min的热重分析法开展了分析。本研究采用弗林-沃尔-小泽（Flynn-Wall-Ozawa, FWO）模型与基辛格-赤平-孙濑（Kissinger-Akahira-Sunose, KAS）模型，探究混燃相互作用与动力学参数。研究结果表明，向原煤中掺混HTC-OPT可提升燃烧效率；HTC-OPT掺混比例越高，最大燃烧速率、着火与综合燃烧性能指数越高，着火温度与燃尽温度则越低。此外，混合燃料表现出与掺混比例成正比的协同混燃相互作用。KAS与FWO模型均显示活化能呈现相似的变化趋势，在HTC-OPT掺混比例为10%时达到最低值（KAS模型为49.94 kJ/mol，FWO模型为60.90 kJ/mol）。