School of Emergency Management and Safety Engineering, China University of Mining & Technology, Beijing, 100083, China.
Lvyuan Branch, State Grid Zhongxing Co., Ltd., Beijing, 100053, China.
Environ Sci Pollut Res Int. 2022 Mar;29(13):19741-19751. doi: 10.1007/s11356-021-17213-y. Epub 2021 Oct 31.
There is a high potential for coal spontaneous combustion (CSC) above the roof beams of supports during the mining-stopped period. Early detection of temperature abnormal zones and corresponding measures are necessary to prevent CSC. In this work, a top-coal temperature measurement method was proposed, combining the coal surface temperature detection and the drilling temperature observation. Furthermore, an apparatus was developed that dramatically increases the rate of dry ice sublimation, resulting in the rapid release of cryogenic carbon dioxide gas. The device utilizes water from firefighting pipes in underground coal mines as a heat source for dry ice sublimation without electrical energy and has been applied and validated taking Silaogou Coal Mine in China as a field test site. Specifically, we found that during the stoppage period, the coal above the supports near the air inlet tunnel is more likely to appear hot spots; the carbon dioxide gas generated by the dry ice phase change device can quickly reduce the hot spots temperature, and the coal temperature does not rebound after the gas injection is stopped. Based on the above analysis, this work can effectively prevent the early top-coal spontaneous combustion during the stop mining period.
采空区停采期间，支架上方的煤体具有较高的自然发火危险性。为防止煤炭自然发火，需要提前检测温度异常区域并采取相应措施。为此，提出了一种结合煤体表面温度探测和钻孔温度观测的采空区遗煤温度测试方法，研制了一种可快速释放低温二氧化碳气体的干冰相变降温装置，该装置以井下消防管路中的水作为干冰升华的热源，无需外部电能，在神东矿区四道柳煤矿进行了现场应用试验。结果表明，停采期间，进风巷附近支架上方的煤体易出现高温点；干冰相变降温装置产生的二氧化碳气体可快速降低高温点温度，且注气停止后煤体温度无明显反弹。由此可见，该方法可有效预防停采期遗煤自然发火。
