凤凰山矿沿空留巷Y型通风方式下采空区漏风规律研究
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摘要
矿井火灾和瓦斯爆炸是我国煤矿的突出灾害,严重影响着井下的正常开采和职工的生命安全。采空区漏风影响着工作面上隅角瓦斯积聚和采空区遗煤自燃。工作面向采空区的漏风,一方面由于大量的氧气为采空区遗煤自燃创造了一个必要条件,另一方面采空区向工作面的回风,引起采空区瓦斯涌出,致使采煤工作面上隅角瓦斯积聚,为瓦斯爆炸创造了条件。
晋城煤业集团凤凰山矿为提高煤炭资源回收率,缓解工作面采掘衔接问题,首次在154307工作面采用了无煤柱沿空留巷技术和Y型通风方式。通过对凤凰山矿154307综采工作面采空区气体进行了长期监测,结合瞬时释放SF6技术测定采空区流场和漏风状况,研究采空区漏风规律。
本文主要研究内容及结论如下：
1、分析比较工作面各通风系统优缺点,研究了Y型通风沿空留巷技术特点及采空区漏风影响因素。
2、通过对凤凰山矿154307工作面沿空留巷墙体采空区气体及工作面上隅角瓦斯进行长期监测,得出：(1)在整个回采期间,仅1#和5#测点在工作面分别推进约450m和650m之后,02浓度才有明显下降趋势,但仍较高,其余各点02浓度均在20%左右,可知回采期间工作面向采空区一直存在着严重的漏风,漏风距离可达500-600m以上；(2)随着工作面推进距离的增加,采空区CH浓度逐渐升高；在距工作面600m范围内,浓度在0.3%以下,最后保持在I.4%左右；(3)工作面回采过程中,上隅角瓦斯基本上在0.2%-O.4%之问。
3、通过瞬时释放SF6技术,测定凤凰山矿154307工作面采空区漏风,现场试验研究采空区风流流动状态,分析各采样点采集到SF6气体峰值浓度与工作面的距离及采空区漏风风速与采样点距工作面距离的变化关系,得出各采样点采集到SF6气体峰值浓度与工作而的距离曲线表达式为：第一次：y1=53.17le-0.089.x、第二次：y2=43.48e0.0635x；采空区漏风风速与采样点距工作面距离曲线表达式为：第一次：y1=0.0644e-0.1753x、第二次：y2=0.0996e-0.1729x。
4、通过Fluent软件,模拟研究采空区风流和采空区氧气浓度分布,模拟结果和现场监测及试验结果有较高的一致性。为以后研究采空区“三带”和制定放灭火措施提供依据。
Mine fire and gas explosition is prominent disasters of coal mine in Chine, which seriously affects the normal underground exploitation and the lives safety of workers. Work-oriented goaf leakage, on the one hand, which creats a necessary condition for spontaneous combustion of coal in gobs because of large quantities of oxygen; on the other hand, the return air to the face in the goaf, which causes the goaf gas emission, resulting in the exploitation working face corner gas accumulationcreate the conditions for the gas explosion.
It improves the recovery rate of coal resources, alleviates the problem of convergence of face extraction on No.154307workface firstly using Y-type ventilation and retained roadway along goaf in Fenghuangshan Coal. Long-term monitoring, combined with mines154307mechanized mining goaf gas instantaneous release of SF6technology for the determination of the goaf flow field and leakage conditions, the study of Gob law.
Main contents and conclusions are as follows:
1. Analysis of the advantages and disadvantages of the relatively face ventilation systems; Y-shaped ventilation air leakage along the goaf with technical features and the goaf influencing factors.
2. From the long-trem monitoring to the Fenghuangshan Mine154307face along the roadway retaining wall goal and working gas emission obtained:(1) throughout the recovery period, only1#and5#measuring points in the face, respectively, advancing about450m and650m, the oxygen concentration to attain significant downward trend, but still high, the rest of the oxygen concentration in about20%, it can see in the recovery period the goaf there has been a serious air leakage, air leakage distance of up to more than500~600m;(2) with the face to promote the increase of the distance, gob methane concentration gradually increased; away from the face600m range, the concentration of0.3%, and finally maintained at about1.4%;(3) the process of mining face, gas which is on the corner is basically in between0.2%to0.4%.
3. Through the instantaneous release of SF6technology, determination of the Fenghuangshan Mine154307goaf leakage, romantic flow state of the field test goaf. Analysis of all sampling points collected to the distance of the peak concentration of SF6gas and the face and the goaf air leakage change the relationship between wind speed and the sampling distance of dot pitch face drawn each sampling point of collection to the peak concentration of SF6gas and face expression from the curvetype:first:y1=53.171e-0089x,second: y2=43.48e-00635x;Of Gob wind speed and distance curve sampling dot pitch face expression:the first:y1=0.0644-01753xsecond:y2=0.0996e-0.1729x。
4. Fluent software simulation of goaf flow and goaf oxygen distribution, the simulation results and on-site monitoring and testing resulting in higher consistency. Provide the basis for future research goaf "zone" and the development of the release of fire-fighting measures.
晋城煤业集团凤凰山矿为提高煤炭资源回收率,缓解工作面采掘衔接问题,首次在154307工作面采用了无煤柱沿空留巷技术和Y型通风方式。通过对凤凰山矿154307综采工作面采空区气体进行了长期监测,结合瞬时释放SF6技术测定采空区流场和漏风状况,研究采空区漏风规律。
本文主要研究内容及结论如下：
1、分析比较工作面各通风系统优缺点,研究了Y型通风沿空留巷技术特点及采空区漏风影响因素。
2、通过对凤凰山矿154307工作面沿空留巷墙体采空区气体及工作面上隅角瓦斯进行长期监测,得出：(1)在整个回采期间,仅1#和5#测点在工作面分别推进约450m和650m之后,02浓度才有明显下降趋势,但仍较高,其余各点02浓度均在20%左右,可知回采期间工作面向采空区一直存在着严重的漏风,漏风距离可达500-600m以上；(2)随着工作面推进距离的增加,采空区CH浓度逐渐升高；在距工作面600m范围内,浓度在0.3%以下,最后保持在I.4%左右；(3)工作面回采过程中,上隅角瓦斯基本上在0.2%-O.4%之问。
3、通过瞬时释放SF6技术,测定凤凰山矿154307工作面采空区漏风,现场试验研究采空区风流流动状态,分析各采样点采集到SF6气体峰值浓度与工作面的距离及采空区漏风风速与采样点距工作面距离的变化关系,得出各采样点采集到SF6气体峰值浓度与工作而的距离曲线表达式为：第一次：y1=53.17le-0.089.x、第二次：y2=43.48e0.0635x；采空区漏风风速与采样点距工作面距离曲线表达式为：第一次：y1=0.0644e-0.1753x、第二次：y2=0.0996e-0.1729x。
4、通过Fluent软件,模拟研究采空区风流和采空区氧气浓度分布,模拟结果和现场监测及试验结果有较高的一致性。为以后研究采空区“三带”和制定放灭火措施提供依据。
Mine fire and gas explosition is prominent disasters of coal mine in Chine, which seriously affects the normal underground exploitation and the lives safety of workers. Work-oriented goaf leakage, on the one hand, which creats a necessary condition for spontaneous combustion of coal in gobs because of large quantities of oxygen; on the other hand, the return air to the face in the goaf, which causes the goaf gas emission, resulting in the exploitation working face corner gas accumulationcreate the conditions for the gas explosion.
It improves the recovery rate of coal resources, alleviates the problem of convergence of face extraction on No.154307workface firstly using Y-type ventilation and retained roadway along goaf in Fenghuangshan Coal. Long-term monitoring, combined with mines154307mechanized mining goaf gas instantaneous release of SF6technology for the determination of the goaf flow field and leakage conditions, the study of Gob law.
Main contents and conclusions are as follows:
1. Analysis of the advantages and disadvantages of the relatively face ventilation systems; Y-shaped ventilation air leakage along the goaf with technical features and the goaf influencing factors.
2. From the long-trem monitoring to the Fenghuangshan Mine154307face along the roadway retaining wall goal and working gas emission obtained:(1) throughout the recovery period, only1#and5#measuring points in the face, respectively, advancing about450m and650m, the oxygen concentration to attain significant downward trend, but still high, the rest of the oxygen concentration in about20%, it can see in the recovery period the goaf there has been a serious air leakage, air leakage distance of up to more than500~600m;(2) with the face to promote the increase of the distance, gob methane concentration gradually increased; away from the face600m range, the concentration of0.3%, and finally maintained at about1.4%;(3) the process of mining face, gas which is on the corner is basically in between0.2%to0.4%.
3. Through the instantaneous release of SF6technology, determination of the Fenghuangshan Mine154307goaf leakage, romantic flow state of the field test goaf. Analysis of all sampling points collected to the distance of the peak concentration of SF6gas and the face and the goaf air leakage change the relationship between wind speed and the sampling distance of dot pitch face drawn each sampling point of collection to the peak concentration of SF6gas and face expression from the curvetype:first:y1=53.171e-0089x,second: y2=43.48e-00635x;Of Gob wind speed and distance curve sampling dot pitch face expression:the first:y1=0.0644-01753xsecond:y2=0.0996e-0.1729x。
4. Fluent software simulation of goaf flow and goaf oxygen distribution, the simulation results and on-site monitoring and testing resulting in higher consistency. Provide the basis for future research goaf "zone" and the development of the release of fire-fighting measures.
引文
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