不同煤屑形状对瓦斯解吸扩散规律影响的数学模拟

发布时间：2019-03-24 15:07

【摘要】：煤屑瓦斯解吸扩散规律的研究对应用解吸法测定煤层瓦斯含量以及预测煤层突出危险性有着重要的现实意义。受煤层地质条件、煤的物理力学性质、钻取工艺等多种因素影响,所取的煤屑会呈现不同的形状,其解吸扩散参数也不尽相同。通过对宏观上可根据肉眼分辨其形状的煤屑的几何形状对煤屑的瓦斯扩散规律的影响进行数学模拟,得出了不同煤屑形状下的瓦斯解吸扩散数学模型及其解析解。考虑到解吸放散时间不同,得到了不同解吸扩散模型的近似式。并通过对比分析发现,同一粒度分布范围内,煤屑瓦斯初期解吸时受到煤屑形状的较大影响;随着解吸时间的延长,煤屑形状的不同对解吸扩散规律影响趋于变小,不同形状的煤屑颗粒内部瓦斯有效扩散形状逐渐近似于球形。
[Abstract]:The research on the law of coal debris gas desorption and diffusion is of great practical significance for the determination of coal seam gas content by desorption method and the prediction of coal seam outburst risk. Due to the geological conditions of coal seam, physical and mechanical properties of coal, drilling technology and other factors, the shape of coal debris will be different, and the desorption and diffusion parameters will also be different. Based on the mathematical simulation of the influence of the geometric shape of coal debris which can be distinguished by naked eyes on the gas diffusion law of coal debris, the mathematical models of gas desorption and diffusion under different coal debris shapes and their analytical solutions are obtained. Considering the different desorption time, the approximate expressions of different desorption diffusion models are obtained. Through the comparison and analysis, it is found that in the same particle size distribution range, the initial desorption of coal debris gas is greatly affected by the shape of coal debris. With the prolongation of desorption time, the influence of coal debris shape on desorption and diffusion law tends to be smaller, and the effective gas diffusion shape in different shapes of coal debris particles gradually approximates to spherical shape.
【作者单位】：瓦斯灾害监控与应急技术国家重点实验室;中煤科工集团重庆研究院有限公司;重庆大学;
【基金】：“十二五”国家科技支撑计划资助项目(2012BAK04B01) 国家自然科学基金青年科学基金资助项目(51104087)
【分类号】：TD712

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