Research and Application on Comprehensive Gas Treatment Technology in Upper Corner of Working Face

In order to overcome the gas overrunning problem by accumulation in the upper corner of working face in Baode Mine, taking the 81304 working face as the research object, the gas source in the upper corner was analyzed. The comprehensive gas treatment technology which contain draining with league lane of buried p ipes in goaf and adjusting the flow, hanging the inclined wind shade, and installing the pressurization board were put forward. A negative pressure range was formed by change local ventilation system, which made the wind corner direction from out to in, guide the flow direction of the upper corner into the goaf, and the into the drainage pipe. After the application, the gas concentration of the upper corner and the No.2 return tunnel decline reached to 50%. The gas concentration of the upper corner rem ained below 0. 5%. It was theoretically proved with the numerical simulation of Fluent that the comprehensive gas treatment technology could effectively change the loc al ventilation system and gas concentration distribution near the upper corner.