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用普通热分析天平测量了煤粉燃烧着火温度,可燃性指数和反应动力学参数。指出将热重曲线发生明显失重时的切线与其基线的交点对应的温度定义为着火温度较为合理;挥发份的总量和不同组成二者均能影响着火;用Anderson-Freeman差减微分法计算反应活化能和频率因子简单、适用。可燃性指数是表征煤在反应前期能力的重要指标,可用于评价火焰稳定性。同种但产地不同的煤,其燃烧特性可能有较大的差别。
The temperature, flammability index and reaction kinetics parameters of pulverized coal combustion were measured with a common thermal analysis balance. It is reasonable to define the temperature corresponding to the intersection point of the tangent line and its baseline at the time of apparent weightlessness of the thermogravimetric curve as the ignition temperature. The total amount of volatiles and the composition of the two components all affect the fire. Anderson-Freeman differential subtraction method is used to calculate the reaction Activation energy and frequency factor simple and suitable. Flammability index is an important indicator of the ability of coal in the pre-reaction can be used to evaluate flame stability. The same type of coal but different origin, the combustion characteristics may have a greater difference.