煤堆自燃的数值模拟及分析

发布时间：2018-04-06 23:25

本文选题：煤堆自燃　切入点：多场耦合　出处：《辽宁工程技术大学学报(自然科学版)》2017年03期

【摘要】：为研究煤堆在自然堆积状态下的自燃影响因素,将不易现场观测的工程实际问题转化为计算机问题.建立了煤堆自然存放的二维模型以及煤堆自燃问题的能量方程和氧浓度方程相耦合的煤堆自燃发火的数学模型.采用多物理场耦合分析软件COMSOL进行解算.结果显示煤堆在第60天时发生自燃现象,到第100 d时煤堆已经完全自燃,并且氧浓度随着时间呈现三带分布.通过改变煤堆的高度和孔隙率后进行解算,显示出煤堆高度和孔隙率增加时,煤堆更加容易发生自燃现象.结果表明:煤堆自燃现象呈现明显的三带分布,并且孔隙率和煤堆高度与煤堆自燃现象的发生呈现正相关.
[Abstract]:In order to study the influence factors of spontaneous combustion of coal pile under the state of natural accumulation, the practical engineering problem which is not easy to observe in situ is transformed into a computer problem.A two-dimensional model for spontaneous combustion of coal piles and a mathematical model for spontaneous combustion of coal piles are established, which are coupled with the energy equation and oxygen concentration equation of the spontaneous combustion of coal piles.The multi-physical field coupling analysis software COMSOL is used to solve the problem.The results show that spontaneous combustion occurs on the 60th day and completely spontaneous combustion at the 100th day, and the oxygen concentration is distributed in three zones with time.By changing the height and porosity of coal pile, it is shown that when the height and porosity of coal pile are increased, spontaneous combustion is more likely to occur.The results show that the spontaneous combustion of coal pile is obviously distributed in three zones, and the porosity and height of coal pile are positively correlated with the occurrence of spontaneous combustion of coal pile.
【作者单位】：辽宁工程技术大学矿业学院;
【分类号】：TD752.2

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