Research on gas diffusion model and experimental diffusion characteristic of cylindrical coal
LI Zhiqiang
CHENG Qiang
LIU Yanwei
DUAN Zhengpeng
SONG Dangyu
Abstract：Under various temperatures and pressures,the gas diffusion experiments were carried out with φ50 mm× 100 mm standard cylindrical coal samples.At the same time,a gas diffusion experiment was carried out by use of the particles of the same coal as comparative experiment.To describe the gas diffusion in cylindrical coal samples,the cylindrical diffusion model was established and the analytical solution of diffusion rate was derived.The results show that the gas diffusion in cylindrical raw coal is slower than that in coal particles.And the cumulative diffusion quantity and diffusivity in cylindrical raw coal is far less than those in coal particles under the same time.The diffusion coefficient of cylindrical raw coal is 11.72 times as much as that of coal particles.This is because that the cylindrical row coal contains a larger pore and fissure diamaters.But the effective diffusion coefficient of cylindrical raw coal is 1.82％ of which in coal particles.That results from the extension of the diffusion path and the increase of the tortuosity.These lead the cylindrical coal core to contain a smaller capacity of release gas.
Keywords：cylindrical coalgascoalbed methanediffusionmodel
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 1033-1040 )