Study On The Experiments Of Increasing Coal Desorption And Permeability Under Power Ultrasound

The coal reservoir permeability is an important index in the mining process of CBM. If we want to improve the CBM production, we must to open the inhibition of CBM migration channels. And the key of opening the inhibition is the crack, crack through and cracks networking. However, it is particularly, on the mechanism of increasing seepage under ultrasound aspects still need to make necessary researches and related experimental studies. Based on the related experiments, in the process of ultrasound effect, raw coal and granular coal problems of crack formation, propagation and through carried on the thorough studies. Results showed that:for multi-level system, multi-scale, discontinuity problems of granular coal can be solved through random statistical theory into continuum problem. Ultrasound mechanical effect can effectively promote the crack tip stress concentration and crack extension and throughout. The heat from ultrasound thermal effect passes through coal rock mass or granular coal mass by heat conduction and makes gas molecules out of inner wall adsorption and makes further improvement on gas desorption quantity. The damage caused by ultrasound effect is help to improve the permeability of low seepage coal rock mass.