小型高瓦斯煤矿煤与瓦斯共采共用技术研究及实践效果

Technology Research and Practice Effects of Coal Mining and Gas Extraction in Small Coal Mine with High Gas

针对云南恩洪矿区某小型高瓦斯煤矿采掘面瓦斯超限、措施失效的问题,采用现场调研、走访交流、理论计算相结合的方法对采掘面瓦斯超限的影响原因展开了分析研究,得到瓦斯超限的关键性原因是被保护层卸压瓦斯未有效治理,在此基础上提出了以"保护层开采+被保护层卸压瓦斯抽采+瓦斯发电+余热利用"为核心内容的"煤与瓦斯共采共用"技术解决方案。实践表明:该方案解决了采掘面瓦斯超限及下部被保护层卸压瓦斯无效抽采问题;确保产量实现30万t/a、煤巷掘进量实现2800 m/a,职工收入增加达17.4%;并且瓦斯发电及余热利用创造收益约445.2万元/a,减排CO2约5.59万t/a,取得显著的安全、经济、生态效益。

Aiming at the problem of gas overrun and measure invalidation in a small coal mine with high gas in Enhong mining area of Yunnan Province,the influence reasons of gas overrun in the mining face were analyzed and studied by the combined method of field investigation,interview and exchange,as well as theoretical calculation.It was found that the key reason of gas overrun was that the pressure-relief gas at the protected layer was not effectively controlled.On this basis,this paper proposed a technical solution of coal mining and gas extraction with the core content of"protective layer mining+drainage of pressure relief gas at protected layer+gas power generation+waste heat utilization".The practice showed that the scheme solved the problems of gas overrun in the mining face and ineffective gas drainage under the pressure relief of the lower protected layer.It ensured the output reached 300000 t/a,the amount of coal roadway excavation reached 2800 m/a,and the income of the employees increased by 17.4%.Moreove,the income generated by gas power generation and waste heat utilization was about4.452 million RMB/a,and the CO2 emission reduction was about 55900 t/a.Remarkable safety,economic and ecological benefits were achieved.