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基于两步反应动力学机理(包括燃料热解和燃料的氧化),建立了二维非稳态燃料填充床阴燃的数学模型.该模型既考虑了固相和气相之间的热传递,也考虑到了气体在多孔介质内扩散系数的变化.辐射换热采用扩散近似方式予以表达.数值模拟结果表明:阴燃传播速度随着来流速度的增大而增大,但当来流速度超过0.35cm/s时,阴燃速度增长幅度大大减小;来流速度对阴燃最高温度影响不大.同时还模拟了燃料阴燃过程中气体组分(O2、CO、CO2及H2O)和固体成分(燃料、焦炭)的变化以及温度分布情况.图8,表2,参12.
Based on the two-step kinetic mechanism (including pyrolysis of fuel and oxidation of fuel), a mathematical model of smoldering of two-dimensional unsteady fuel packed bed was established. The model not only considered the heat transfer between solid phase and gas phase, but also Considering the change of diffusion coefficient of gas in porous media, the radiation heat transfer is expressed by diffusion approximation.The numerical simulation results show that the smoldering velocity increases with the increase of velocity, but when the velocity of flow exceeds 0.35 cm / s, the rate of increase of smoldering velocity decreases greatly, while the velocity of smoldering has no significant effect on the smoldering maximum temperature.The gas components (O2, CO, CO2 and H2O) and solid content (Fuel, coke) changes and temperature distribution Figure 8, Table 2, 参 参 12.