偏Y形通风工作面上隅角瓦斯抽采模拟

Simulated research on the gas drainage in the upper corner of the working face with partial Y type ventilation

为解决保德煤矿81505工作面上隅角瓦斯超限问题,选择联巷埋管抽采瓦斯方式进行治理。使用COMSOL模拟软件建立采场物理模型,研究瓦斯埋管抽采前后采空区和工作面O_(2)、CH_(4)体积分数分布、工作面在推进过程中采空区最高温度与工作面风速的关系,分析采空区瓦斯分布和采空区"三带"的变化。结果表明:随瓦斯抽采流量增加,工作面上隅角瓦斯体积分数降低;抽采位置距工作面距离增加,工作面上隅角的瓦斯体积分数降低。根据保德煤矿81505工作面采空区的最短自然发火期,选择抽采流量为40 m^(3)/min,在距工作面40 m处进行瓦斯抽采,工作面上隅角瓦斯体积分数从0.53%降低到0.17%,氧化带宽度从100 m增加到149 m。最后通过现场实践,工作面上隅角瓦斯体积分数降低到0.16%,采空区氧化带的宽度范围为135~150 m,在降低工作面上隅角瓦斯体积分数的同时降低了采空区发生自燃的危险性。

The given paper has chosen the gas drainage method through the buried pipes in crossheadings for treatment so as to solve the problem of the gas transfinite in the upper corner of 81505 working face of the Baode Coal Mine.And,for the said purpose,we have chosen the drainage of the flowing rate of 40 m^(3)/min for the gas drainage and the distance of 40 m between the drainage position of the 81505 working face as the starting working face.And,in doing so,the volume fraction of the gas in the upper corner of the working face has been made reduced from 0.53% to 0.17%,whilst the width of the oxidation zone has increased from 100 m to 149 m.And,thus,eventually,through the field practice,the volume fraction of the gas in the upper corner of the working face has managed to establish a physical model of the stope by using the COMSOL simulation software to build up the relationships between the concentration distribution of O_(2 )and CH_(4) in the goaf and the working face pre-&-pro the gas drainage with the buried pipes.And,next,we have managed to calculate and work out the maximum temperature of the goaf and the wind ventilation speed of the working face by analyzing the gas distribution and the changes of the “3 zones” in the goaf of Baode Coal Mine 81505 working face,the drainage flow rate of 40 m^(3)/min and the distance of 40 m between the drainage position and the working face are selected for the gas drainage.The volume fraction of the gas in the upper corner of the working face has reduced from 0.53% to 0.17%,while the width of the oxidation zone tends to increase from 100 m to 149 m.And,finally,through the field practice,the volume fraction of gas in the upper corner of the working face can be reduced to 0.16%,and the width of the oxidation zone in the goaf should be found between 135-150 m.Thus,it has reduced not only the gas concentration in the upper corner of the working surface,but helped to reduce of the danger of spontaneous combustion in the goaf to some extent.