Research on key technologies of emergency refuge system in underground coal mine

Abstract：A method of preventing escape tunnel from being blocked was presented：build not less than 3 roadways so as to decrease the probability of all escape channels blocked;make sure of no mechanical electrical equipment existing in ventilation roadway to reduce fire source of detonating gas;ventilation roadway should not play the role of walkway in order to reduce human casualties caused by gas explosion.Put forward a method of relay escape with oxygen breathing apparatus：install refuge chambers which have oxygen breathing apparatus every certain distance in escape channels.A method of naturally reducing temperature of refuge chambers was proposed：refuge chambers can be cooled down by coal rock around them when the coal rock which form the refuge chambers are at lower temperature.In this case,refuge chambers don＇t need installed refrigeration equipment and insulation-treatment.Refrigeration and cooling equipment is unnecessary for refuge chambers which connected with ground through hole,such refuge chambers should be cooled down by supplying air from ground.For the purpose of not only adding a escape tunnel,but also contribute to cooling down the temperature by air come from ground.The diameter of hole which connected refuge chambers with ground should be 700 mm.Raised a method of arranging pipeline which has a strong ability of anti-disaster：the electric cables and optical cables in monitoring system,personnel position system,communication system,and the pipelines in compressed-air self-help system,water rescue system should be all buried in channel.A method of constructing refuge chambers with no compressed air spray was brought forward.Put forward emergency refuge system in undergroundcoal mine which composed of oxygen breathing apparatus,compressed oxygen self-rescuers,escape channels,refuge chambers,escaping routes and indications,emergency plan.