煤自燃发展过程微观反应机理函数
Microscopic Reaction Mechanism Function of Coal Spontaneous Combustion Development Process
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摘要: 煤的自燃机理是煤自燃防治的理论基础。现有的煤自燃机理函数在煤的高温氧化阶段拟合的较好，但在低温氧化阶段，由于动力学特性参数测试求解的准确性导致拟合效果较差。采用微量热仪C80，测试了煤样从室温到200 ℃的不同升温速率下的低温氧化产热特性。基于煤产热特性，得到了煤样在低温氧化过程中动力学特性参数随着反应进程的实时变化规律，确定了煤低温氧化过程的动力学机理函数即一维扩散（D1）机理函数，微分形式为f(a)=1/2a。Abstract: Coal spontaneous combustion mechanism is the theoretical basis of prevention and control of coal spontaneous combustion. The existing coal spontaneous combustion mechanism functions have fitted better in the high temperature oxidation stage, but in the low-temperature oxidation stage, the imprecise of the kinetic parameters testing and solving results in poor fitting effect. Micro-calorimeter C80 is used to test thermal properties of low-temperature oxidation of coal samples from room-temperature to 200 ℃ under different heating rates. Based on coal thermal properties, the real-time variation law of kinetics parameters of coal samples is obtained with the reaction process in the process of low-temperature oxidation. The kinetic mechanism function of low-temperature coal oxidation process is also determined, which is one-dimensional diffusion (D1) mechanism function, and whose differential form is f(a)=1/2a.
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