Experimental Study on Gas Desorption Characteristics in Coal under External Pressure and Liquid Immersion
In order to study the desorption law of gas in coal samples under external pressure and liquid invasion,a high-pressure injection gas containing coal constant temperature desorption experimental device was used.The cumulative gas desorption amount and desorption speed at different times were used as evaluation indicators to investigate the effects of different injection pressures,different injection solutions,and different degrees of coal sample metamorphism on gas desorption characteristics.The results show that the higher the injection pressure,the higher the concentration of the composite surfactant FHR-1 in the injected solution,and the relatively smaller the cumulative gas desorption amount and desorption rate of the coal sample at different times;The increase in injection pressure and the concentration of composite surfactant FHR-1 have a relatively large impact on the early gas desorption rate,while the impact on the later gas desorption rate is relatively small;The greater the degree of metamorphism of the coal sample,the greater the cumulative gas desorption amount and desorption rate.Among them,the cumulative gas desorption amount and desorption rate of anthracite are significantly higher than those of gas coal and brown coal.The research results indicate that the amount and speed of gas desorption in coal seams are reduced under external pressure and liquid immersion,and injecting surfactant solution is more effective in preventing gas outburst problems than injecting pure water.
coal seam water injectionexternal pressuresurfactantsgas desorption characteristicsdesorption speed
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