压实防治煤堆自燃的适用性

发布时间：2018-03-13 19:24

本文选题：煤堆　切入点：自燃　出处：《辽宁工程技术大学学报(自然科学版)》2017年05期 　论文类型：期刊论文

【摘要】：为明确煤堆压实的适用性,使用COMSOLMultiphysics5.0数值仿真软件,建立变风速条件下不同孔隙率煤堆自热-自燃的二维数值模型,研究孔隙率(0.2~0.6)变化时煤堆在不同风速下(0.1~11.5 m/s)的最高温度,确定了不同孔隙率煤堆的自燃风速范围,比较煤堆压实前后最高温度与自然发火期变化,分析了煤堆压实的适用性.研究结果表明:随风速增加煤堆最高温度呈双指数变化;孔隙率越小自燃风速范围越宽,最小、最易、最大自燃风速与孔隙率之间具有负指数关系;压实可以对原孔隙率0.6的煤堆起到有效的保护作用,孔隙率0.5、0.4、0.3的煤堆分别在风速大于0.9 m/s、1 m/s、1.4 m/s时压实后,最高温度不降反升,自然发火期明显缩短;说明煤堆压实因煤堆孔隙率和环境风速不同存在不适用范围.
[Abstract]:In order to determine the applicability of coal pile compaction, a two-dimensional numerical model of spontaneous heating and spontaneous combustion of coal pile with varying wind velocity was established by using COMSOLMultiphysics5.0 numerical simulation software. The maximum temperature of 0.1 ~ 11.5 m / s) of coal pile under different wind speed was studied. The range of spontaneous combustion wind speed of coal pile with different porosity is determined, the variation of maximum temperature and spontaneous combustion period before and after coal compaction is compared, and the applicability of coal pile compaction is analyzed. The results show that the maximum temperature of coal pile varies exponentially with the increase of wind speed. The smaller the porosity is, the wider the range of spontaneous combustion wind speed is, the smallest, the easiest, the negative exponential relationship between the maximum spontaneous combustion velocity and the porosity, the compaction can effectively protect the coal pile with the original porosity 0.6. When the air velocity is greater than 0.9 m / s ~ (-1) m / s ~ (-1) m / s, the maximum temperature increases and the spontaneous combustion period is shortened, which indicates that the compaction of coal pile has an inapplicable range due to the difference of coal pile porosity and environmental wind speed.
【作者单位】：辽宁工程技术大学矿业学院;辽宁工程技术大学力学与工程学院;中国煤炭科工集团沈阳研究院;辽宁工程技术大学安全学院;
【基金】：国家自然科学基金煤炭联合基金重点项目(U1361211);国家自然科学基金(51274110,51474121) 辽宁省教育厅一般项目(2015221,2012122) 辽宁工程技术大学生产技术问题创新研究基金项目(14-T-001)
【分类号】：TD752.2

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