Experimental study on desorption diffusion characteristics of coalbed methane under real time electric field loading
ZHOU Yong
LEI Dongji
Abstract：In order to explore the desorption diffusion characteristics of coalbed methane under real-time electric field loading and reveal the effect of electric field on efficient extraction of coalbed methane,the desorption diffusion test system of coal under con-trollable electric field strength was designed and developed independently.The desorption diffusion characteristics of CH4 and CO2 in coal under electric field loading were investigated experimentally,and the diffusion coefficient under each electric field strength was calculated by power function diffusion model.The results show that:under the real-time loading of electric field,the desorption capacity of coal is improved to a certain extent,but the influence of electric field on the desorption capacity of CO2 is more obvious.At the same time,the electric field can strengthen the initial desorption speed of coal gas.Compared with no electric field,the initial desorption speed of CH4 increases by 6.9%,15.3%,14.6%when the characteristic field strength is 30,60,90 kV/m,and the CO2 in-creases by 3.4%,6.7%,9.2%;on the other hand,the results of power function diffusion of CH4 in coal under electric field loading show that the diffusion model can be highly consistent with the experimental values,and the diffusion coefficient increases with the increase of the loading field strength.The electric field is conducive to the desorption and diffusion of methane in coal.
Keywords：desorption diffusion characteristics of coalbed methaneelectric field strengtheningdesorption amountpower function dynamic diffusion modeldiffusion coefficient
Publication Date：2024-01-20
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：7( 65-71 )