Research On The Absorption Characteristics Of Different Destroyed-Type Coal In JiaoZuo Coal Ming Area

It is a important issues must be overcome in the coal seam production safely about coal and gas outburst,also,this coal mine disaster with the direct factors about damage coal,the adsorption performance of destroyed coal has important value in the coal gas extraction ability,the determination of gas content,gas occurrence and coal and gas outburst prevention. In order to research the influence of adsorption performance of different failure types coal seam,the paper with a combined method doing experiment. theoretical analysis with mumerical calculation,taking the P1 coal seam of JiuLi shan ming in JiaoZuo Coal Ming Area as example. By collecting different destroyed-type coal sample,testing the isothermal adsorption curve of different destroyed-type coal of coal samples,studying on adsorption performence and difference about different destroyed-type coal under the condition of the same pressure. Measuring the specific surface area pore distribution and pore volume of destroyed-type coal sample,and analyzing the relation between them and gas adsorption of destroyed-type coal;By using the gas content coefficient of three kinds of destroyed-type coal to calculate the influence of adsorption performance of different failure types coal seam on the capacity of gas extraction. Being analyzed the influence between adsorption performance of different failure types coal seam and gas outburst.The results show that:(1) with the deepening of the damage degree of coal,the higher gas content of coal there is the largest gas content of crushing coal,strongly destruction coal is second,the destruction coal is minimum.both the coal gas content and flammable base adsorption showed similar features;(2)At the same temperature,the gas content of three kinds of destruction coal is increased with the extent of damage deepen;(3) At the same temperature,the saturated adsorption capacity of three kinds of destruction coal is increased with the extent of damage deepen;(4) As the temperature increases,the value a of Langmuir adsorption contant of three kinds of destruction coal is decreasing,but the value b, no obvious rule value,and caused the adsorption quantity decreased with the rise of temperature;(5) The adsorption experiment of cryogenic liquid nitrogen,the results of pressure mercury experiment show that:the depth,causing damage of complicated pore structure of coal,especially,specific surface area increased with the extent of damage deepen is is the main factor to influence the adsorption performance of different failure types coal seam;(6) The same degree of failure of coal seam, the specific surface area of coal increases,the ability of gas adsorption strengthen,which led to the gas content coefficient increases with the extent of damage deepen,and different failure types of coal has different gas content coefficient,which led to the performance of the extraction is different,The ultimate representation is:at the same extraction conditions, the extent of damage is bigger,the gas effective extraction radius is smaller,the extraction capacity is worse.