Liu Zhenqi, Zhong Qiu, Lu Yansen
Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering, China University of Mining and Technology, No1, Daxue Road, Xuzhou, Jiangsu, 221116, People's Republic of China.
Key Laboratory of Gas and Fire Control for Coal Mines, Ministry of Education, China University of Mining and Technology, Xuzhou, 221116, China.
Sci Rep. 2024 Jan 24;14(1):2087. doi: 10.1038/s41598-024-51955-2.
Methane-air explosion is one of the major disasters in industrial process. The explosion strength could be influenced by the crushed coal gangue, which is widely distributed in coal mine gob and roadway. To understand the influence of the coal gangue on gas explosion, an experimental system with a 0.2 × 0.2 × 3.0 m pipeline was designed and explosion experiments of coal gangue with 5 blockage length-diameter ratios (ratio of axial blockage length to pipeline equivalent diameter) were carried out. The results show that coal gangue can cause significant disturbances to the flame front, resulting in a violent acceleration of the explosion flame. The overpressure ratio presents a negative exponential function distribution with the blockage length-diameter ratio. The influence range increases with the blockage length-diameter ratio under the condition of rich fuel, and reaches the maximum when equivalent ratio is 1.237. The explosion intensity is more sensitive to the blockage length-diameter ratio for the equivalent ratio equals 1.0 and 1.237. The formation of high-intensity explosion should be avoided by controlling the accumulation state of the overlying rock in coal mining.
甲烷-空气爆炸是工业生产过程中的主要灾害之一。爆炸强度可能会受到碎煤矸石的影响，煤矸石广泛分布于煤矿采空区和巷道中。为了解煤矸石对瓦斯爆炸的影响，设计了一个管道尺寸为0.2×0.2×3.0米的实验系统，并进行了5种堵塞长径比（轴向堵塞长度与管道当量直径之比）的煤矸石爆炸实验。结果表明，煤矸石会对火焰前沿造成显著扰动，导致爆炸火焰剧烈加速。超压比与堵塞长径比呈负指数函数分布。在富燃料条件下，影响范围随堵塞长径比增大而增大，当当量比为1.237时达到最大。对于当量比等于1.0和1.237的情况，爆炸强度对堵塞长径比更为敏感。在煤矿开采中，应通过控制上覆岩层的堆积状态来避免高强度爆炸的形成。
