大型煤自燃试验的火源演化特征模拟

发布时间：2018-03-20 15:20

本文选题：散热环境　切入点：漏风　出处：《煤炭科学技术》2017年01期 　论文类型：期刊论文

【摘要】：为弥补大型自然发火试验可重复性差的不足和掌握不同外部环境下煤自燃过程火源的演化特征,利用数值模拟的方法,通过设定与试验环境一致的边界条件,得到了自然发火过程炉内火源演化的主要特征。通过改变模型参数,研究了散热环境和漏风对火源分布及温度的影响,结果表明:在火源位置逐渐向空气表面发展的过程中,漏风量增大不仅显著扩大了高温范围,而且相同温度下火源位于距表面更深的位置;降低环境散热量,会导致火源区域径向扩散,并使整个区域内煤的温度梯度减小;漏风条件主要影响高温阶段煤的升温速率,而散热量增多则会显著延长煤的低温氧化过程。
[Abstract]:In order to make up for the lack of repeatability of large-scale spontaneous combustion test and to master the evolution characteristics of coal spontaneous combustion process under different external environments, the boundary conditions consistent with the test environment were set by numerical simulation. The main characteristics of the evolution of the fire source in the natural combustion process are obtained. By changing the model parameters, the effects of the heat dissipation environment and the air leakage on the distribution and temperature of the fire source are studied. The results show that the fire source position gradually develops to the air surface. The increase of air leakage not only enlarges the range of high temperature, but also at the same temperature, the fire source is located in a deeper position from the surface, the decrease of environmental heat loss will lead to the radial diffusion of the fire source region and the decrease of the temperature gradient of coal in the whole area. The air leakage condition mainly affects the heating rate of coal in high temperature stage, while the increase of heat dissipation will significantly prolong the oxidation process of coal at low temperature.
【作者单位】：西安科技大学安全科学与工程学院;西部矿井开采及灾害防治教育部重点实验室;
【基金】：国家自然科学基金青年基金资助项目(51404195) 陕西省教育厅科研计划资助项目(14JK1476)
【分类号】：TD752.2

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