论文部分内容阅读
利用热重分析天平,研究非等温燃烧条件下无烟煤、贫煤与高挥发分烟煤的混合煤试样的燃烧特性及其反应动力学参数。考察了不同配比混合煤试样的挥发分初析温度、着火温度、最大燃烧速率和燃尽特性等燃烧特征参数,求出了反应的动力学参数活化能Ea和指前因子A。研究结果表明:随着烟煤配入量的增加,混合煤的挥发分初析温度、着火温度和燃尽温度逐渐降低;当掺混比为1∶1(质量比,下同)时,混合煤的最大燃烧速率处于最小值,存在分级燃烧现象;活化能和指前因子均随混合煤中烟煤比例的增加而降低,存在“动力学补偿效应”;烟煤的配入量对无烟煤混合煤的挥发分析出阶段起作用,对固定碳的燃烧阶段作用很小,而对贫煤混合煤的两个阶段均有显著影响。
The thermogravimetric analysis balance was used to study the combustion characteristics and reaction kinetics parameters of anthracite, lean coal and high volatile bituminous coal samples under non-isothermal combustion conditions. The ignition parameters such as the initial temperature of ignition, the ignition temperature, the maximum burning rate and the burn-out characteristics were investigated. The activation energy Ea and the pre-exponential factor A of the reaction kinetic parameters were calculated. The results show that with the increase of the amount of bituminous coal, the initial temperature, the ignition temperature and the burnout temperature of the mixed coal gradually decrease. When the mixing ratio is 1: 1 (mass ratio, the same below), the mixed coal Of the maximum combustion rate at the minimum value, the existence of staged combustion phenomenon; activation energy and the pre-exponential factor with the mixed coal in the proportion of bituminous coal decreases, there is “dynamic compensation effect”; blending of bituminous coal mixed anthracite Of the volatilization analysis of the role of phase, fixed carbon combustion stage is very small, but lean coal mixed coal in both stages have a significant impact.