Abstract Co-combustion of biomass offers a great potential to reduce CO2 emissions but rarely mentioned co-combustion behavior of pelletized coal-biomass mixtures and inconclusive results based on single determinants formed obstacle for industrial application. In this study, ignition and flame characteristics, reaction and kinetic parameters and pollutant generation path were comprehensively investigated. Intrinsic combustion experiments were carried with the gas phase maintaining at room temperature in a concentrating photothermal reactor at heating rate over 200 °C/s. Same “homogeneous” ignition was evidenced while advanced devolatilization but more intense slagging behaviors were identified with the increase of biomass proportion. With the biomass proportion increased from 0% to 40%, the activation energies during devolatilization to ignition decreased non-linearly from 47.44 kJ/mol to 8.03 kJ/mol, indicating the existence of synergistic effect. CO exhibited relative high generation rates and the generation rate increased with the biomass content. Three fitted CO peaks were identified during co-combustion, which were contributed by devolatilization of coal and biomass, and combustion of char, respectively. First increased and then decreased NO emission with the increase of biomass proportion was evidenced for the higher N content in biomass but enhanced reduction by char and NH radicals with higher biomass proportion.

中文翻译：

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球团煤-生物质混合物在浓缩光热反应器中的混燃行为综合研究

摘要 生物质共燃为减少CO2排放提供了巨大的潜力，但很少提及颗粒煤-生物质混合物的共燃行为以及基于单一决定因素的不确定结果对工业应用构成了障碍。在这项研究中，对点火和火焰特性、反应和动力学参数以及污染物生成路径进行了综合研究。本征燃烧实验是在室温下在浓缩光热反应器中以超过 200°C/s 的加热速率进行的。同样的“均质”点火被证明，同时先进的脱挥发分，但随着生物质比例的增加，结渣行为更强烈。随着生物质比重从0%提高到40%，脱挥发分到点火的活化能从47.44 kJ/mol非线性下降到8.03 kJ/mol，表明存在协同效应。CO 表现出相对较高的生成率，并且生成率随着生物质含量的增加而增加。在混合燃烧过程中确定了三个拟合的 CO 峰，它们分别由煤和生物质的脱挥发分以及焦炭的燃烧产生。随着生物质比例的增加，NO 排放先增加然后减少，这证明生物质中的 N 含量较高，但炭和 NH 自由基的还原作用随着生物质比例的增加而增强。在混合燃烧过程中确定了三个拟合的 CO 峰，它们分别由煤和生物质的脱挥发分以及焦炭的燃烧产生。随着生物质比例的增加，NO 排放先增加然后减少，这证明生物质中的 N 含量较高，但炭和 NH 自由基的还原作用随着生物质比例的增加而增强。在混合燃烧过程中确定了三个拟合的 CO 峰，它们分别由煤和生物质的脱挥发分以及焦炭的燃烧产生。随着生物质比例的增加，NO 排放先增加然后减少，这证明生物质中的 N 含量较高，但炭和 NH 自由基的还原作用随着生物质比例的增加而增强。