水封式巷道瓦斯抽放技术探讨

A preliminary study on water sealing tunnel drainage technology for gas drainage

为降低矿井瓦斯含量,依据瓦斯难溶于水的性质,提出水封式巷道抽放瓦斯技术。某矿井瓦斯抽放实例显示,水封式抽放密闭性好,瓦斯抽放浓度高(达95%),且抽放量大(该矿累计抽采瓦斯2.8×109m3)。预抽后,矿井的绝对瓦斯涌出量由40 m3/min降为24.27 m3/min,相对瓦斯涌出量由12 m3/t降为6.9 m3/t,使高瓦斯矿井变为低瓦斯矿井。该技术真正实现了煤与瓦斯共采,有效解决了瓦斯治理难题,其安全效益、经济效益和社会效益显著。

In order to reduce mine gas content as well as retrofit into low gas content mine from high gas content mine, the water sealing tunnel drainage （WSTD） is proposed under the basis of low dissolvability of mine gas in this paper. This novel technology has shown some significant advantages since it was applied in a mine, i. e. good gas resistance,drainage gas with higher concentration-reach purity of 95 %, higher drainage preductivity. After pilot test of WSTD in the mine, the absolute effusive load of gas was decreasing to 24.27 m^3/min from 40m^3/min in corresponding to relative effusive load of 6.9 m^3/t from 12m^3/t, wheras the accumulative drainage output was 2.8× 10^9 m^3. Therefore, the co-production of coal and gas can be simultaneously realized by the novel technology, which shall have positive significance in safety, economy and social effect as well as good solution for problem of gas disposal.