石油焦与煤混合燃料热重分析研究

Thermogravimetric analysis on the pyrolysis and combustion characteristics of mixed fuels of petroleum coke and coal

石油焦与煤混合燃烧是高效处理石油焦的有效方法,作者对选用的石油焦和煤不同配比的混合燃料进行了热重分析研究。使用常压高温热天平研究、分析了各配比混合燃料的热解特性和燃烧特性。并根据化学动力学方法计算了各过程的化学动力学参数,即活化能E和频率因子A0。结果表明,各混合燃料热解起始温度大致相同,随煤焦比减小,挥发分析出速率变缓,最大释放速度所对应的温度升高,最终失重率减小,挥发分释放特性指数减小;随煤焦比增大,混合燃料着火温度和燃尽温度逐渐降低,最大燃烧速率所对应的温度降低,燃烧特性指数增大;随煤焦比减小,活化能和频率因子增大。

Co-combustion of petroleum coke with coal is an effective and attracting method to treat the petroleum coke. In this work, the thermogravimetric analyses on the pyrolysis and combustion performance of adopted bituminous coal, petroleum coke and their mixed fuels were conducted. The chemical kinetic parameters including the apparent activation energy E and the pre-exponential factor A_0 were obtained based on the thermogravimetric results. The experimental results indicate that the starting pyrolysis temperature changes little with the decrease of the ratio of coal to petroleum coke, the rate of volatile release slows down, the temperature corresponding to the maximum rate of volatile release is increasing, and the final weight loss is reducing. The chemical kinetic parameters (E and A_0) are increasing. By contraries, when the ratio of coal to coke is increasing, the ignition and burn-out temperature and the temperature corresponding to the maximum combustion rate are decreasing.