煤巷高冒区高温区域判定及其防治技术研究

High temperature zone identification and prevention techniques concerned in the top-coal collapse regions due to the coal-layer drifting

在分析高冒区松散煤体赋存状态基础上,以平煤十三矿11111巷道高冒区为例,应用FLUENT软件模拟高冒区温度场,根据模拟结果,确定高冒区高温区域,并结合传热、传质理论分析了高冒区松散煤体自燃过程。最后根据判定的高冒区高温区域,提出了利用复合发泡充填材料防治高冒区高温区域的方法。研究表明:高冒区内,高温点出现在高冒区中部;复合发泡充填材料在防治高冒区松散煤体自燃方面是有效的。

This paper aims to give a report of our study results on the high temperature zone identification and prevention techniques concerned in the top-coal falling regions due to the coal-layer drifting. As is well known, loose spontaneous coal combustion, which is likely to occur in the top-coal falling region, has become one Of the most dangerous sources leading to the coal-mine-breeding fire. As we have analyzed, the presence of loose coal in the top-coal drifting region is the primary reason to lead to the mining fire. And, next, we have made an analysis of the loose coal spontaneous combustion process based on the heat transfer and mass transfer theory. In our research, we have taken the 13th mine of Ping Ding Shan Coal Co. Ltd as our case study with the temperature field being synchronously simulated by using the FLUENT software. In our research, the high temperature zone is identified based on the numerical simulation result whereas the method to prevent the loose coal spontaneous combustion in the topcoal falling region is proposed by means of grouting filling material of compound fire-fighting foam. The study results of ours show that the high-temperature point also occurs in the middle of the top-coal falling region but the area around the high-temperature point the temperature keeps low with the lowest temperature seen far away from the high- temperature point. We have also found that the loose coal spontaneous combustion process in the top-coal collapsing region is actually the result of the interaction of heat-mass transfer. In the spontaneous combustion process it is the heat-current pressure and the driving force of heat and mass transfer that prompts the air leak into the top- coal falling region. It is the heat and mass circulation that has resulted in the loose coal spontaneous combustion there. Based on the i- dentification of the nature of the high temperature zone we have done the grouting and extracted the gas from the underground to inspect the grouting effect . And finally the grouting results indicate that the material we have chosen is effective for preventing the loose coal spontaneous combustion in the top-coal falling region. What is more, and our findings can also be used by others to control such coal spontaneous combustion in other mines.