| Gas outburst has seriously affected the coal mine Production safety and workers' life safety,at the Present stage for water injection inhibiting gas desorPtion mechanism has been a breakthrough,however,for different injection conditions,the study of different coal quality were lacking.Through exPerimental study on coal Particles,the canister without overburden Pressure and cylinder with Pressure situation,by changing the test method of water injection water,water injection Pressure,gas injection rate and the size of the overburden Pressure,the exPeriment device and exPeriment method of desorPtion characteristics of coal gas Pressure water;confirm the velocity of gas desorPtion increase in the effect of overburden Pressure,but the injection water will reduce the gas desorPtion rate,in effect of overburden Pressure under reasonable water injection rate dePends on the coal and overburden Pressure is verified in the same size;water injection conditions of low Pressure water injection to reduce gas desorPtion velocity;after water injection through the study of gas desorPtion characteristics,Put forward by the first minutes of gas the first minute desorPtion velocity,gas desorPtion rate,gas desorPtion rate of 120 minutes and the residual gas content calculation method of reasonable water injection,water injection by reasonable water injection Pressure,Influence of coal quality and gas adsorPtion caPacity.By analyzing the experimental data,with the increase of injection water after water flooding gas initial dpeed,decresorption sease of the final leveling off;With the increase of injection water after water flooding gas desorption rate is falling,finally leveled off,accumulative total desorption rate increasing,the final leveling off;Increasing gas residual stock,the final leveling off;The diffusion coefficient of coal sample decreases continuously,finally leveled off.Without overburden pressure,the reasonable water injection sihe coal moisture between 3% ~ 5%;Super the reasonable water injection coal moisture between 3% ~ 7%;The ancient han shan coal water moisture between 3% ~ 5%;Overburden pressure under the action of;Super the reasonable water injection coal moisture between 5% ~ 8%;The ancient han shan coal water moisture content is between 8% ~ 11%. |
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