Application of High Level Borehole Goaf Gas Drainage Technology to Zhangji Mine

Zhangji Mine is a high gassy mine.There were great gas emissions from the fully mechanized coal mining face and the gas emission sources were the gas mainly from the goaf.Taking No.1111 fully mechanized coal mining face as an example,with the gas drainage parameters were optimized,the high level borehole was applied to the gas drainage in the goaf.The site practices showed that the high level borehole applied to the gas drainage in goaf could be good in effect,the gas drainage concentration could be high and the gas drainage value would be high.The over limit problem of the gas content was effectively solved in the fully mechanized coal mining face and the safety production of the high gassy mine in the mining area could be ensured.