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首页> 外文期刊>Transport in Porous Media >Gas Diffusion in Coal Powders is a Multi-rate Process
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Gas Diffusion in Coal Powders is a Multi-rate Process

机译：煤粉中的气体扩散是一个多速率过程

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摘要

Gas migration in coal is strongly controlled by surface diffusion of adsorbed gas within the coal matrix. Surface diffusion coefficients are obtained by inverse modelling of transient gas desorption data from powdered coals. The diffusion coefficient is frequently considered to be dependent on time and initial pressure. In this article, it is shown that the pressure dependence can be eliminated by performing a joint inversion of both the diffusion coefficient and adsorption isotherm. A study of the log-log slope of desorbed gas production rate against time reveals that diffusion within the individual coal particles is a multi-rate process. The application of a power-law probability density function of diffusion rates enables the determination of a single gas diffusion coefficient that is constant in both time and initial pressure.
机译：煤中的气体迁移受煤基质中吸附气体的表面扩散的强烈控制。表面扩散系数是通过对煤粉中瞬时气体解吸数据的反演获得的。通常认为扩散系数取决于时间和初始压力。本文表明，通过对扩散系数和吸附等温线进行联合反演可以消除压力依赖性。对解吸气体生产率随时间的log-log斜率的研究表明，单个煤颗粒内的扩散是一个多速率过程。扩散率的幂律概率密度函数的应用使得能够确定在时间和初始压力上都恒定的单个气体扩散系数。

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