负压对瓦斯抽采效果的影响机制研究
Study on Influence Mechanism of Negative Pressure on Gas Drainage Effect
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摘要: 为深入研究负压与抽采效果的作用机制,以便确定合理抽采负压区间,实现瓦斯抽采低耗高产的目标;通过搭建实验平台模拟不同孔长和不同孔口负压条件下的抽采过程,测试不同孔深位置相关抽采参数变化规律;研究结果表明:管内负压和流量随孔长均逐渐降低,呈负指数关系;对于同一个测试位置,随着孔口负压的升高,负压和管内流量也随着升高,但升高的幅度逐渐减小。经在某矿3号煤层试验考察,随抽采负压升高,抽采浓度和抽采纯量均呈先升高后降低趋势,2个参数与抽采负压分别构成典型的二次函数关系;而抽采混量随抽采负压升高呈直线上升趋势,两者表现为线性函数关系;采用求导取极值方法,确定3号煤层最佳瓦斯抽采负压区间为30.78~34.50 kPa。Abstract: To further study the mechanism of negative pressure and drainage effect to determine the reasonable negative pressure interval and achieve the goal of low consumption and high production of gas drainage, by setting up an experimental platform to simulate the extraction process under different hole lengths and different hole negative pressure conditions, the variation laws of relevant extraction parameters at different hole depths were tested. The results showed that the negative pressure and flow rate in the pipe decreased gradually with the hole length, showing a negative exponential relationship. For the same test site, with the increase of negative pressure in the pump station, the negative pressure and the flow inside the tube also increase, but the increase range decreases gradually. According to the test investigation in No.3 coal seam of a certain mine, with the increase of negative pressure, the extraction concentration and the extraction purity both increase at first and then decrease, and the two parameters and the extraction negative pressure constitute a typical quadratic function relationship, respectively; while the extraction mixing amount increases linearly with the increase of negative pressure, which shows a linear function relationship; the derivative extremum method is used to determine the best gas extraction in No.3 coal seam. The negative pressure range is 30.78 kPa to 34.50 kPa. The research results have important guiding significance for improving the effect of mine gas extraction.
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