正压密封方法数值模拟及其在矿井防灭火中的应用

发布时间：2018-06-13 15:59

  本文选题：采空区 + 瓦斯燃烧　； 参考：《中国安全科学学报》2015年01期

【摘要】：为控制采空区火灾和防止有毒有害气体外泄,基于矿井空气流动理论和均压防灭火方法,建立气室注氮正压控制密闭漏风数值模型。分析气室内氮气正压对采空区密闭漏风行为的控制规律,并以恒大煤矿2132工作面采空区火灾控制为实例进行验证。实例结果表明,在气室内连续注入的氮气的相对正压作用下,通风巷道向采空区漏风的速率迅速减小,并最终停止和反向,形成由气室向通风巷道微量漏氮状态;当采空区抽采负压在-300 Pa,瓦斯流量为30 m3/min,瓦斯体积分数为70%时,保持气室注氮流量0.2 m3/min、正压15 Pa,回风巷处采空区内O2体积分数在1天内降至5%以下,C2H2在3日内消失,C2H4在15日内消失,CO在26日内消失,温度在35日后降至30℃以下,采空区火灾得到控制。
[Abstract]:In order to control the goaf fire and prevent the release of poisonous and harmful gases, a numerical model of air leakage controlled by positive nitrogen injection in gas chamber is established based on the theory of mine air flow and the method of equal pressure and fire extinguishing. This paper analyzes the control law of positive nitrogen pressure in gas chamber on the behavior of airtight air leakage in goaf, and takes the fire control of goaf in 2132 face of Hengda Coal Mine as an example to verify it. The results show that under the relative positive pressure of continuously injected nitrogen in the gas chamber, the rate of air leakage from the ventilation tunnel to the goaf decreases rapidly, and finally stops and reverses, resulting in the state of trace nitrogen leakage from the gas chamber to the ventilation tunnel. When the negative pressure in the goaf is -300 Pa, the gas flow is 30 m3 / min, the gas volume fraction is 70. Keep the nitrogen injection rate in the chamber 0.2 m3 / min, positive pressure 15 Pa. the volume fraction of O2 in the goaf in the return air lane decreases within 1 day to less than 5% C _ 2H _ 2 within 3 days, and C _ 2H _ 4 disappears within 15 days and CO disappears within 26 days, and the temperature decreases to below 30 鈩，

本文编号：2014575