Numerical simulation of adsorption process of O2/H2O mixed gas in coal porous media

IF 6.9 1区工程技术 Q2 ENERGY & FUELS International Journal of Coal Science & Technology Pub Date : 2024-06-25 DOI:10.1007/s40789-024-00714-9

Huiyan Guo, Hongxiang Zhou, Chang Guo, Rongshan Nie, Xiaoyu Liang

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Abstract

It is of great significance for coal mining and utilization to study the adsorption process of mixed gas in coal. In this paper, the Monte Carlo method (MC) is employed to study the competitive saturation adsorption of oxygen and water vapor inside coal particles, and then the convection, diffusion and adsorption inside and between particles are studied by lattice Boltzmann method (LBM). In addition, this study examines the impacts of porosity, average particle size, and gas concentration on the process of adsorption in coal porous media. The research results show that oxygen and water vapor present in the mixed gas experience increased permeability, diffusion rate, and saturated adsorption capacity as the porosity and average particle size of the coal porous medium increase. However, the time required to achieve saturated adsorption decreases. Under the condition of maintaining the proportion of gas components and altering the initial gas concentrations from 4.087 to 53.131 mol/m³, saturated adsorption capacity of both gases remains nearly unchanged. Yet, the effective diffusivity of gases declines with increasing initial concentration. Additionally, it is also found that water vapor diffuses more quickly than oxygen in the mixed gas and achieves adsorption saturation faster.

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煤炭多孔介质中 O2/H2O 混合气体吸附过程的数值模拟

研究煤中混合气体的吸附过程对煤炭开采和利用具有重要意义。本文采用蒙特卡洛法（Monte Carlo method，MC）研究了煤颗粒内部氧气和水蒸气的竞争饱和吸附，然后采用晶格玻尔兹曼法（Lattice Boltzmann method，LBM）研究了颗粒内部和颗粒之间的对流、扩散和吸附。此外，本研究还探讨了孔隙率、平均粒度和气体浓度对煤炭多孔介质吸附过程的影响。研究结果表明，随着煤炭多孔介质孔隙率和平均粒径的增加，混合气体中的氧气和水蒸气的渗透率、扩散速率和饱和吸附容量都会增加。然而，达到饱和吸附所需的时间却在缩短。在保持气体组分比例不变、初始气体浓度由 4.087 mol/m3 变为 53.131 mol/m3 的条件下，两种气体的饱和吸附容量几乎保持不变。然而，气体的有效扩散率随着初始浓度的增加而下降。此外，研究还发现，混合气体中水蒸气的扩散速度比氧气快，吸附饱和的速度也更快。

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来源期刊

International Journal of Coal Science & Technology Multiple-

CiteScore

11.40

自引率

8.40%

发文量

678

审稿时长

12 weeks

期刊介绍： The International Journal of Coal Science & Technology is a peer-reviewed open access journal that focuses on key topics of coal scientific research and mining development. It serves as a forum for scientists to present research findings and discuss challenging issues in the field. The journal covers a range of topics including coal geology, geochemistry, geophysics, mineralogy, and petrology. It also covers coal mining theory, technology, and engineering, as well as coal processing, utilization, and conversion. Additionally, the journal explores coal mining environment and reclamation, along with related aspects. The International Journal of Coal Science & Technology is published with China Coal Society, who also cover the publication costs. This means that authors do not need to pay an article-processing charge.