煤孔隙空间几何特征对瓦斯解吸曲线形态的控制机制研究进展

Research Progress on the Control Mechanism of Coal Pore Space Geometric Characteristics on the Shape of Gas Desorption Curves

煤孔隙空间特征控制着瓦斯解吸曲线的具体形态,构建可表征孔隙空间几何特征的煤体瓦斯解吸扩散模型是科学化研究瓦斯解吸特性控制机制的重要内容之一。本文首先深入梳理了当前解吸扩散模型的缺陷,并提出了一种反演孔隙几何参数的瓦斯扩散模型建模路径,即利用自扩散系数的边界感应特性,构建扩散系数衰减的定量化模型,进而引入经典的单孔扩散模型,形成一种含孔隙几何参数的单孔优化模型,并归纳总结了瓦斯解吸扩散研究中亟待解决的科学问题和工程问题。研究进展为定量化研究煤孔隙结构和瓦斯解吸曲线形态的关系指明了方向和思路,为进一步实现精准化瓦斯抽采及智能化突出防治提供了重要理论依据。

Coal pore space geometric characteristics control the specific shape of gas desorption from coal.Establishing the quantitative relationship between gas sorption-diffusion characteristics and pore space geometric characteristics is one of the most important scientific issues that should be solved about the controlling mechanism of gas desorption.Firstly,the main defects of the desorption diffusion model are thoroughly summarized.Then,a method to establish gas diffusion models that can invert the geometric parameters of pores is proposed.By using the boundary induction characteristics of the self-diffusion coefficient,a mathematical model describing the attenuation characteristics of the gas apparent diffusion coefficient is obtained,which can be further introduced into the classical unipore diffusion model,forming an unipore diffusion model containing pore geometry parameters.At last,several scientific and engineering problems that need to be solved urgently regarding the area of gas sorption-diffusion are summarized.The research process points out the direction and paths for quantitatively studying the relationship between coal pore structure and gas desorption curve shape,and it provides an important theoretical basis for further realization of accurate gas extraction and intelligent outburst prevention.