Abstract: Aiming at the closed fire-area of gas outburst mine , because of long tine and wide range closure, large amounts of high concentration gas accumulated in the enclosed space, which should be released first before opening the fire-area. In order to guarantee the safety and high rate of high concentration gas emission, gas drainage system was applied for drainage of closed high concentration gas, and nitrogen were injected into the closed area for the replacement of high concentration of gas, moreover, CH4, CO and online temperature monitoring probes were set in gas drainage pipe, to control the development situation of the fire in real time, and provide technical support for the safety of gas drainage and fire area opening.

Key words: Gas outburst, Closed fire-area, Fire-area opening, Gas emission