首页> 外文会议>International symposium on combustion >ON THE PREDICTION OF THERMAL RUNAWAY OF COAL PILES OF DIFFERING DIMENSION BY USING A CORRELATION BETWEEN HEAT RELEASE AND ACTIVATION ENERGY
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ON THE PREDICTION OF THERMAL RUNAWAY OF COAL PILES OF DIFFERING DIMENSION BY USING A CORRELATION BETWEEN HEAT RELEASE AND ACTIVATION ENERGY

机译:用热释放与激活能量的相关性与不同尺寸的煤桩热失控预测

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Greater use of international coal and low-sulfur/low-rank coals brings new challenges in monitoring the spontaneous combustion behavior of these coals during transport, in stockpiles, and in coal milling systems. Extensive experimental work has been carried out to measure the kinetic parameters of low-temperature oxidation of a number of coals for varying particle fractions. A substantial set of experimentally measured values of activation energy, E_a, and the product of the exothermicity and the pre-exponential factor, QA, have indicated a strong relationship, which is shared by coals of different ranks and of different particle size. This correlation for E_a and QA leads to a new approach for estimating the thermal runaway behavior of coal piles based on small-scale experiments. By use of Frank-Kamenetskii theory, the correlation curve fit of E_a versus QA can be used to estimate hazardous conditions at varying scales by small-scale oven heating tests measuring the heat release rate at low temperatures. The results suggest that the increasing size of the pile alters the particle size effect. For large coal piles, large particle size can increase the potential for spontaneous combustion. This new approach provides a more cost-effective assessment of the susceptibility of various types of coal to self-ignition.
机译:更多使用国际煤和低硫/低级煤炭在运输,库存和煤铣系统中监测这些煤的自发燃烧行为带来了新的挑战。已经进行了广泛的实验工作,以测量用于不同颗粒级分的许多煤的低温氧化动力学参数。一种大量的实验测量值的激活能量,E_A和放热和预指数因子,QA的乘积表明了强有力的关系,其由不同等级和不同粒径的煤部共享。 e_a和qa的这种相关性导致了一种基于小规模实验估算煤桩的热失控行为的新方法。通过使用Frank-Kamenetskii理论,通过小型烤箱加热试验测量低温下的热释放速率,可以使用E_A与QA的相关曲线拟合以估计不同鳞片的危险条件。结果表明,桩的较大尺寸改变了粒度效应。对于大型煤桩,大的粒度可以增加自发燃烧的可能性。这种新方法提供了更具成本效益的评估各种类型煤的易感性。

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