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分析了煤粒瓦斯解吸扩散的过程，建立了第三类边界条件下的煤拉瓦斯扩散的教学物理模型并给出了模型的解析解．结论表明，第三类边界条件下的瓦斯扩散模型包含以往研究的第一类边界条件下的扩散模型，传质毕欧准数能表征煤粒瓦斯扩散场的特点；介绍了测试煤粒瓦斯扩散系数和表面传质系数的方法，给出了测试实例．
The process of coal gas desorption and diffusion was analyzed. The teaching physical model of coal lavas diffusion under the third type of boundary conditions was established and an analytical solution of the model was given. The results show that the gas diffusion model under the third type of boundary conditions includes the diffusion model under the first type of boundary conditions studied in the past and the mass transfer Bi Odds Index can characterize the gas diffusion field of coal particles. Coefficient and surface mass transfer coefficient method, gives a test example.