Linghu Jianshe, Chen Haidong, Wang Liguo, An Fenghua
Huayang New Material Technology Group Co., Ltd., Yangquan 045000, China.
State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization, Henan Polytechnic University, Jiaozuo 454000, China.
ACS Omega. 2022 Jun 7;7(24):21163-21171. doi: 10.1021/acsomega.2c01962. eCollection 2022 Jun 21.
Realizing efficient gas drainage in low permeability coal seams has always been a difficult problem for coal miners. Based on this, this paper proposes a new technology of large-diameter mechanical cave-making to promote gas extraction in a coal seam. This technology mainly uses the pressure of a water injection pump to control the automatic opening and closing of a mechanical reaming device to realize mechanical cavitation, and the hole diameter can reach up to 500 mm. The gas drainage effect of mechanical cavitation drilling is analyzed by a numerical simulation, which shows that under the condition of the same drainage time, the larger the cavitation radius is, the larger the effective influence radius of gas drainage is. According to the field test results, the time of single cave-making is about 5 min, and the speed of cave-making is fast. The coal output of a single cave is 0.42 t/m, and the pressure relief effect is obvious. Compared with ordinary drilling, the gas drainage concentration of mechanical cavitation drilling is increased by 2 times and the net amount of drainage is increased by 1.8 times. Large-diameter mechanical cavitation technology can better improve the gas drainage effect of outburst coal seams with low permeability and has a good application prospect.
实现低透气性煤层的高效瓦斯抽采一直是煤矿工作者面临的难题。基于此，本文提出了一种大直径机械造穴促进煤层瓦斯抽采的新技术。该技术主要利用注水泵的压力控制机械扩孔装置的自动开合来实现机械造穴，孔径可达500mm。通过数值模拟分析了机械造穴钻孔的瓦斯抽采效果，结果表明在相同抽采时间条件下，造穴半径越大，瓦斯抽采有效影响半径越大。根据现场试验结果，单次造穴时间约为5min，造穴速度快。单穴煤炭产量为0.42t/m，卸压效果明显。与普通钻孔相比，机械造穴钻孔瓦斯抽采浓度提高了2倍，纯抽采量提高了1.8倍。大直径机械造穴技术能更好地提高低透气性突出煤层的瓦斯抽采效果，具有良好的应用前景。
