顶板长钻孔替代高抽巷抽采控瓦斯与采空区注氮防火耦合治理研究
投稿时间:2019-03-07  修订日期:2019-04-25  点此下载全文
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作者单位E-mail
郭长恒 太原理工大学 安全与应急管理工程学院 851359221@qq.com 
邢玉忠 太原理工大学 安全与应急管理工程学院  
中文摘要:高瓦斯矿井易自燃煤层,工作面受上隅角瓦斯超限与采空区遗煤自燃双重威胁,为解决高抽巷抽采瓦斯导致采空区氧化带面积变大,增大遗煤自燃危险性的矛盾。以顶板长钻孔替代高抽巷,配合进风巷侧注氮,通过对长钻孔参数与注氮参数的优化,进行防火与控瓦斯耦合治理的研究。以中兴煤业1401工作面实测数据结合Fluent数值模拟,首先研究了长钻孔数量、位置对工作面上隅角瓦斯的影响规律,获得以5个直径300mm,距回风巷10m、距煤层底板15m的顶板长钻孔替代高抽巷的最优方案。在此基础上,为保障对采空区遗煤自燃的有效控制,研究了注氮量与注氮位置对采空区氧化带分布的影响规律,获得在进风巷侧氧化带与散热带分界位置注入5.5m3/min的氮气,将采空区氧化带宽度降至25m的优选结果。通过对上隅角瓦斯与采空区遗煤自燃的综合控制,保证了工作面的安全生产。
中文关键词:顶板长钻孔,瓦斯抽采,注氮防火,耦合治理,数值模拟
 
Study on Coupled Control of Gas Drainage and Gas Control with Nitrogen Injection and Fire Prevention in Goaf by Long Roof Borehole Replacing High Drainage Roadway
Abstract:High gas mine is easy to spontaneous combustion coal seam, working face is threatened by gas exceeding limit in upper corner and spontaneous combustion of residual coal in goaf. In order to solve the contradiction between gas drainage in high gas extraction roadway and enlargement of oxidation zone area in goaf and increase the risk of spontaneous combustion of residual coal. The roof long borehole is used to replace the high extraction roadway, and the side injection of nitrogen into the air intake roadway is used. Through optimizing the parameters of long borehole and nitrogen injection, the coupling control of fire prevention and gas control is studied. Based on the measured data of 1401 working face of Zhongxing Coal Industry and Fluent numerical simulation, the influence of the number and location of long boreholes on the gas in the upper corner of working face was studied. The optimum scheme of replacing high extraction roadway with 5 roof long boreholes of 300 mm in diameter, 10 m away from return air roadway and 15 m away from the floor plate of coal seam was obtained. On this basis, in order to ensure effective control of spontaneous combustion of residual coal in goaf, the effects of nitrogen injection amount and location on distribution of oxidation zone in goaf were studied. The optimal results were obtained by injecting 5.5m3/min nitrogen into the boundary of oxidation zone and heat dissipation zone on the side of air inlet roadway and reducing the oxidation zone width of goaf to 25m. Through the comprehensive control of gas in upper corner and spontaneous combustion of residual coal in goaf, the safe production of working face is guaranteed.
keywords:long roof drilling,gas extraction,nitrogen injection fire prevention,coupling governance,numerical simulat
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