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首页> 外文期刊>Combustion Science and Technology >Pyrolysis, Combustion, and Fragmentation Model of Coal Particles: Preliminary Results
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Pyrolysis, Combustion, and Fragmentation Model of Coal Particles: Preliminary Results

机译：煤颗粒的热解，燃烧和破碎模型：初步结果

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摘要

A mathematical model has been developed to predict fragmentation of particles under a wide range of pyrolysis and combustion conditions. The model is an upgrade of a previous one that took into account only fragmentation during the heat up and devolatilization stage. The model calculates the temperature and oxygen profiles within the particle, the evolution of internal porosity as a consequence of both devolatilization and carbon combustion, the mechanical stress caused by temperature gradients, and by volatiles-generated overpressure inside the particles. Eventually the model calculates the probability of rupture of the particle based on the Weibull (1939) theory. The model has been used to simulate heating of coal particles under inert conditions at different heating rates and temperatures showing good agreement with previous work. The model has been further used to simulate heating under oxidative conditions in order to highlight the role of combustion on fragmentation phenomena.
机译：已经开发出数学模型来预测在各种热解和燃烧条件下颗粒的破碎。该模型是对先前模型的升级，该模型仅考虑了加热和脱挥发分阶段的碎片。该模型计算颗粒内的温度和氧分布，挥发度和碳燃烧导致的内部孔隙率的演变，温度梯度以及颗粒内部挥发物产生的超压所引起的机械应力。最终，该模型根据Weibull（1939）理论计算出粒子破裂的概率。该模型已被用来模拟在惰性条件下以不同的加热速率和温度对煤颗粒的加热，与先前的工作显示出很好的一致性。该模型已被进一步用于模拟氧化条件下的加热，以突出燃烧对碎片现象的作用。

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