有限差分法解析自燃煤矸石山深部温度  

Analysis of Internal Temperature of Coal Gangue Dump with Spontaneous Combustion Based on Finite Difference Method

作　　者：夏清[1] 胡振琪[1] 王海娟[1] 许立江 张艳[1] 

机构地区：[1]中国矿业大学(北京)地球科学与测绘工程学院土地复垦与生态重建研究所,北京100083

出　　处：《矿业安全与环保》2015年第4期1-3,共3页Mining Safety & Environmental Protection

基　　金：国家自然科学基金项目(41371502)

摘　　要：基于固体热传导理论的非稳态温度场模型,采用实验模拟缓慢升温期的煤矸石山内部实际导热情况,利用有限差分法对煤矸石山深部温度进行解析并研究深部温度热传导规律。结果表明:距热源0.2 m深度范围内,温度急剧下降,温升幅度较大,而随着距热源的距离增加,温度下降至40℃左右,最后趋于外界稳定温度值20℃。利用有限差分法对模型进行解析,计算得出温度实测值与解析值的最大误差为8.56℃,最小误差仅为0.02℃,说明该模型解析精度较高,适用于自燃煤矸石山深部温度的解析与定量预测。Experiments were conducted to simulate the internal heat conduction of the coal gangue dump in the period of slow temperature rise with the unsteady state temperature field model which was based on the solid heat conduction theory,and analysis was made on the internal temperature of the coal gangue dump and study was carried out on the heat conduction rule of the internal temperature by using the finite difference method. The results showed that the temperature rapidly decreased and the temperature rise was larger in the range of 0. 2 m away from the heat source,but with the increase of the distance to the heat source,the temperature reduced to about 40 ℃ and finally it was close to the environmental temperature of 20 ℃. Analysis was made on the model by using finite difference method,it was obtained that the maximum difference between the measured values and the analytical values was 8. 56 ℃ and the minimum difference was only 0. 02 ℃,this indicated that this model had a higher accuracy and was suitable for the analysis and quantitative prediction of the internal temperature of the coal gangue dump.

关 键 词：煤矸石山 自燃 温度场 有限差分法 深部温度 

分 类 号：TN011[电子电信—物理电子学]