Study On The Prevention And Control Of Coal And Gas Outburst By Cooling Technology

With the increase of mining depth,temperature of the mine is on the rise.Because of the gas desorption process is an endothermic process,so the rise of temperature lead to large gas desorption.Coal seam gas content is one of the important indexes of the measure of coal and gas outburst,so this condition increases the risk of coal and gas outburst,to the coal resources safety production process will bring about greater challenges.This paper through laboratory studies the influence of temperature on the gas desorption laws.Through the analysis of coal gas desorption under the condition in different desorption temperature(25?,35? and 45?)and different desorption balance pressure(0.3 MPa,0.5 MPa and 0.8 MPa).The results show that coal's gas desorption quantity and volume increase AQ will increase as desorption temperature increases at the same desorption condition,the gas desorption speed also increases at the every time point,especially in the initial phases of gas desorption.Considering the influence of the temperature,amends the experience formula of Gas desorption quantity and gas desorption speed.Take desorption temperature of 25? for reference,gets influence coefficient,this influence coefficient can escription of gas desorption laws in the form of different temperature conditions,and the result's accuracy of measuring gas content will being further improved.This paper adopts the cooling mode technology of coal seam,in order to reduce the amount of gas desorption,prevent and reduce the possible of coal and gas outburst.Through the analysis of the temperature distribution of coal seam under the condition in different initial temperature(30?,40 ? and 50?),different refrigeration cooling temperature(2 ?,5 ? and 10 ?),different coefficient of thermal conductivity(0.28 W/(m·?),0.35 W/(m·?)and 0.50 W/(m·?)),and the cooling time is 30 days.Through the cooling technology application of coal samples,we can summarize the cooling laws,which provides the theory for actual operation,and ensure the smooth progress of the safety production in coal mine.