With the rapid development of low-rank coal chemistry industry, the production of ultra-low volatile carbon-based solid fuels (pyrolyzed and gasified semi-cokes) with inferior combustion performance has been continuing a rising trend. The semi-cokes blended with bituminous coal in utility boiler is considered as a promising approach to realize the efficient and clean utilization of low-rank coal. Nevertheless, the co-combustion features and kinetics of ternary blending are still unclear and less work has focused on the thermal interactions between bituminous coal and various semi-cokes. Here, the thermogravimetric experiments were employed to elucidate the co-firing characteristics of various carbon-based solid fuels. The results show that the ignition temperatures of blended fuel are decreased by co-firing bituminous coal, and the ignition temperature of blend is lower than that of linear additivity. Under the conditions of 70% pyrolyzed semi-coke blended with 30% bituminous coal, the ignition temperature is reduced by 9.3% and the burnout temperature is increased by 70.6% with the heating rate raised from 10 °C/min to 40 °C/min. The apparent activation energy of blend is higher than linear additivity when the pyrolyzed semi-coke proportion is lower than 40%. The negative effects of semi-cokes on blends are reduced when the bituminous coal is blended with both pyrolyzed and gasified semi-cokes. The ignition temperature, burnout temperature and combustion index change linearly with the fraction of semi-coke. The results could provide guidance for the clean and efficient utilization of semi-cokes in utility boiler.

随着低级煤化学工业的快速发展，燃烧性能较差的超低挥发性碳基固体燃料（热解和气化半焦）的生产一直在增长。在公用锅炉中将半焦炭与烟煤掺混被认为是实现低级煤高效清洁利用的一种有前途的方法。然而，三元混合的燃烧特性和动力学仍然不清楚，很少有研究集中在烟煤和各种半焦之间的热相互作用。在这里，热重实验被用来阐明各种碳基固体燃料的共燃特性。结果表明，混合燃烧烟煤可降低混合燃料的着火温度，掺合物的着火温度低于线性加和法。在70％的热解半焦与30％的烟煤混合的条件下，随着升温速率从10°C / min升高到40°C /，点火温度降低了9.3％，燃尽温度提高了70.6％。分钟 当热解半焦比低于40％时，共混物的表观活化能高于线性加成。当将烟煤与热解半焦化和气化半焦炭混合时，半焦炭对混合物的负面影响减小。点火温度，燃尽温度和燃烧指数随半焦的比例线性变化。研究结果可为公用锅炉中半焦的清洁有效利用提供指导。在70％的热解半焦与30％的烟煤混合的条件下，随着升温速率从10°C / min升高到40°C /，点火温度降低了9.3％，燃尽温度提高了70.6％。分钟 当热解半焦比低于40％时，共混物的表观活化能高于线性加成。当将烟煤与热解半焦化和气化半焦炭混合时，半焦炭对混合物的负面影响减小。点火温度，燃尽温度和燃烧指数随半焦的比例线性变化。研究结果可为公用锅炉中半焦的清洁有效利用提供指导。在70％的热解半焦与30％的烟煤混合的条件下，随着升温速率从10°C / min升高到40°C /，点火温度降低了9.3％，燃尽温度提高了70.6％。分钟 当热解半焦比低于40％时，共混物的表观活化能高于线性加成。当将烟煤与热解半焦化和气化半焦炭混合时，半焦炭对混合物的负面影响减小。点火温度，燃尽温度和燃烧指数随半焦的比例线性变化。研究结果可为公用锅炉中半焦的清洁有效利用提供指导。加热速率从10°C / min提高到40°C / min时，燃尽温度增加3％，燃尽温度提高70.6％。当热解半焦比低于40％时，共混物的表观活化能高于线性加成。当将烟煤与热解半焦化和气化半焦炭混合时，可减少半焦炭对混合物的负面影响。点火温度，燃尽温度和燃烧指数随半焦的比例线性变化。研究结果可为公用锅炉中半焦的清洁有效利用提供指导。加热速率从10°C / min提高到40°C / min时，燃尽温度增加3％，燃尽温度提高70.6％。当热解半焦比低于40％时，共混物的表观活化能高于线性加成。当将烟煤与热解半焦化和气化半焦炭混合时，半焦炭对混合物的负面影响减小。点火温度，燃尽温度和燃烧指数随半焦的比例线性变化。研究结果可为公用锅炉中半焦的清洁有效利用提供指导。当将烟煤与热解半焦化和气化半焦炭混合时，半焦炭对混合物的负面影响减小。点火温度，燃尽温度和燃烧指数随半焦的比例线性变化。研究结果可为公用锅炉中半焦的清洁有效利用提供指导。当将烟煤与热解半焦化和气化半焦炭混合时，半焦炭对混合物的负面影响减小。点火温度，燃尽温度和燃烧指数随半焦的比例线性变化。研究结果可为公用锅炉中半焦的清洁有效利用提供指导。