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利用热重分析天平,采用非等温燃烧的方法对生物质热解产物——生物质焦与两种无烟煤混合试样的燃烧特性及其反应动力学参数进行了实验研究,考察了不同配比的混合试样的着火温度、燃烧速率最大时温度、燃尽温度和最大燃烧速率等燃烧特征参数,求出了反应的动力学参数活化能Ea和指前因子A.结果表明:活化能和指前因子均随混煤中生物质焦比例的增加而降低,存在动力学补偿效应;煤中掺入生物质焦后,试样燃烧的第一阶段和第二阶段的活化能分别呈现出“U形”曲线和“阶梯形”曲线的规律,且对混合燃料热解过程的作用要优于对固定碳燃烧过程的作用;活化能的计算表明生物质焦的存在有助于改善煤的着火性能,对煤的燃烧有催化促进作用.
The combustion characteristics and reaction kinetics parameters of biomass pyrolysis products - biomass coke mixed with two kinds of anthracite were studied by using thermogravimetric balance and non-isothermal combustion method. The effects of different proportions The ignition temperature of the mixed sample, the combustion temperature at the maximum combustion rate, the burnout temperature and the maximum combustion rate, the activation energy Ea and the pre-exponential factor A of the kinetic parameters were calculated.The results show that the activation energy and the pre- The factors are all decreased with the increase of the proportion of biomass coke in the mixed coal, which has the effect of kinetic compensation. After the coal is mixed with biomass coke, the activation energies of the first and second phases of the sample combustion show "U Shape and curves and the effect on the pyrolysis process of the mixed fuel is better than that on the fixed carbon combustion process. The calculation of the activation energy shows that the existence of the biomass coke helps to improve the coal The fire performance, the catalytic combustion of coal has a catalytic role.