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Numerical modelling of the self-heating process of a wet porous medium

机译:湿多孔介质自热过程的数值模拟

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In this research, the shortcomings of some advanced models for heat and fluid flow and moisture transport within and around a reactive porous medium (a coal stockpile) are numerically investigated based on a local thermal non-equilibrium approach and results are compared with experimental data. A full account of the problem is presented, including transient variation of the maximum temperature in the medium and the time required to vaporize the water content. The former is the main parameter used in the study of spontaneous self-ignition of coal stockpiles and the latter is an indication of the last step of self-heating toward self-ignition. Correlations are developed for the maximum dimensionless temperature inside the pile when the moisture content is near zero and the time that it takes from the beginning of self-heating until this time as functions of porosity, permeability, moisture content and the overall size of the porous medium.
机译:在这项研究中,基于局部热非平衡方法,数值研究了反应性多孔介质(煤堆)内部和周围的热,流体流动和水分传输的一些高级模型的缺点,并将结果与​​实验数据进行了比较。提出了对该问题的完整说明,包括介质中最高温度的瞬时变化和蒸发水分所需的时间。前者是研究煤料自发自燃的主要参数,后者是自热朝着自燃迈出的最后一步的指示。当水分含量接近于零时,以及从自加热开始到这段时间所花费的时间与孔隙率,渗透率,水分含量和多孔材料总尺寸的关系,就可以得出桩内部最大无量纲温度的相关性。介质。

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