Effects of ambient pressure on diffusion kinetics in coal during methane desorption
by Bing Zhang; Hanpeng Wang; Liang Yuan; Zhongzhong Liu; Yuqiang Zhang; Shucai Li; Junhua Xue; Shugang Wang
International Journal of Oil, Gas and Coal Technology (IJOGCT), Vol. 24, No. 3, 2020

Abstract: To elucidate the influence of ambient pressure on diffusion kinetics during gas desorption, which is of great significance to the efficient development of coalbed methane, a methane desorption experiment was carried out on coal particles under different ambient pressures, and diffusion coefficients for each test time were solved by the unipore diffusion model. The experiment was carried out using our independently developed 'coal particle methane desorption meter' to overcome the difficulty that the existing equipment could not achieve a constant ambient pressure higher than atmospheric pressure. The results show that during methane desorption in coal particles, the diffusion coefficient was not constant but gradually decreased with time, showing a power function relationship. In addition, the diffusion coefficient decreased linearly with increasing ambient pressure, and the degree of influence was related to time. This research will play an important role in improving the unipore diffusion model and elucidating the gas production mechanisms. [Received: February 2, 2018; Accepted: May 9, 2018]

Online publication date: Mon, 01-Jun-2020

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