烟煤、杂木颗粒和油泥混燃特性的热重分析

Thermogravimetric assessment of blended fuel for bituminous coal,miscellaneous wood pellets and oil sludge

为了研究烟煤、杂木颗粒和油泥的掺混燃烧特性,通过热重试验对三者的掺混燃料进行燃烧特性分析,利用FWO法对掺混燃料进行动力学分析。研究结果表明:烟煤燃烧过程主要为固定碳燃烧,杂木颗粒的燃烧过程更复杂、燃烧性能最好,其综合燃烧特性指数高达1.93×10^(-7);掺烧杂木颗粒可有效改善烟煤的燃烧性能,当烟煤和杂木颗粒以1∶4的质量比掺混燃烧时,掺混燃料的着火温度较烟煤降低了35%,综合燃烧特性指数比杂木颗粒提高了7.2%;烟煤和杂木颗粒掺烧的最概然函数为[-ln(1-α)]^(-3)/4;当杂木颗粒掺混比高达45%时,适量掺混油泥有助于提升燃料燃烧性能;三者掺混燃料的燃烧反应最概然函数为[-ln(1-α)]2;当烟煤、杂木颗粒和油泥的掺混比例为40∶40∶20和45∶45∶10时,掺混燃料对应的活化能较其它比例掺混燃料有明显降低,综合燃烧特性指数是纯烟煤的1.5倍左右。

To investigate the combustion characteristics of a blended fuel consisting of bituminous coal,miscellaneous wood pellets,and oil sludge,thermogravimetric analysis is conducted on the blended fuel to analyze its combustion behavior.The FWO method is employed for kinetic analysis of the blended fuel.The results show that the combustion process of bituminous coal is primarily fixed carbon combustion,while the combustion process of miscellaneous wood pellets is more complex and exhibits the best combustion performance,with a comprehensive combustion characteristic index as high as 1.93×10^(-7).Co-firing with miscellaneous wood pellets effectively enhances the combustion performance of bituminous coal.When bituminous coal and miscellaneous wood pellets are blended in a mass ratio of 1∶4,the ignition temperature of the blended fuel decreases by 35%compared to bituminous coal alone.The comprehensive combustion characteristic index increases by 7.2%compared to miscellaneous wood pellets.The most probable function for the co-firing of bituminous coal and miscellaneous wood pellets is[-ln(1-α)]^(-3)/4.When the blending ratio of miscellaneous wood pellets reaches 45%,the appropriate addition of oil sludge can improve the combustion performance of the fuel.The most probable function for the combustion reaction of the blended fuel consisting of all three components is[-ln(1-α)]~2.When the blending ratios of bituminous coal,miscellaneous wood pellets,and oil sludge are 40∶40∶20 and45∶45∶10,respectively,the corresponding activation energies of the blended fuel are significantly lower than those of other blending ratios,and the comprehensive combustion characteristic index is approximately 1.5 times that of pure bituminous coal.