为了揭示超声波强化煤层气高效抽采的机理，自主研发了可控超声波激励煤吸附/解吸甲烷试验装置，试验研究了不同功率的超声波激励下煤中甲烷的解吸规律，结果表明：不加超声波和超声波激励下煤中甲烷的解吸动力学规律相同，在煤中的甲烷解吸全过程中，甲烷的初始解吸速度较大，随着时间的缓慢增加，解吸速度逐渐减小，最终趋于0，且解吸规律能很好地遵循扩散模型；超声波作用下煤中甲烷解吸量增大，且超声波功率越大，解吸量增幅增加，解吸量增加26.1%～65.6%；基于传热传质学理论，超声波激励下煤的传质毕欧准数减小，扩散系数增大，表明超声波能促进甲烷解吸、扩散。

In order to reveal mechanism of high-efficiency extraction of coalbed methane by ultrasonic，a new experimental equipment was invented for absorption/desorption research of methane on coal.The methane desorption rules of coal under different ultrasonic excitations were experimentally studied.The results show that there is no difference in dynamic behaviors of methane desorption on coal with or without acoustic wave influence，which are all in accordance with diffusion model.During the entire process of methane desorption in coal，the initial desorption rateis relatively large.With the increase of time，the desorption rate gradually decreases and eventually approaches 0，and the desorption law can well follow the diffusion model； the desorption amount of methane in coal increases under the action of ultrasound，and the larger the ultrasonic power，the increase in desorption amount increases，and the desorption amount increases by 26.1% to 65.6%.Based on the theory of heat and mass transfer，Biot's criterion of mass transmission decreases and diffusion coefficient increases under acoustic wave stimulation，indicating that ultrasonic can promote the desorption and diffusion of methane.