The influence of different diffusion pattern to the sub- and super-critical fluid flow in brown coal

3rd International Conference on Energy Equipment Science and Engineering

Peng, Peihuo^1,2

School of Mechanics and Civil Engineering, China University of Mining and Technology, Beijing

100083, China^1

School of Science, Beijing University of Civil Engineering and Architecture, Beijing

102612, China^2

关键词: Darcy equations;    Diffusion patterns;    Engineering applications;    Enhanced coal bed methane recoveries;    Knudsen diffusion;    Nano-scale pores;    Sub- and super-critical;    Swelling effect;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/128/1/012107/pdf
DOI  :  10.1088/1755-1315/128/1/012107

来源: IOP

【 摘 要 】

Sub- and super-critical CO2flowing in nanoscale pores are recently becoming of great interest due to that it is closely related to many engineering applications, such as geological burial and sequestration of carbon dioxide, Enhanced Coal Bed Methane recovery ( ECBM), super-critical CO2fracturing and so on. Gas flow in nanopores cannot be described simply by the Darcy equation. Different diffusion pattern such as Fick diffusion, Knudsen diffusion, transitional diffusion and slip flow at the solid matrix separate the seepage behaviour from Darcy-type flow. According to the principle of different diffusion pattern, the flow of sub- and super-critical CO2in brown coal was simulated by numerical method, and the results were compared with the experimental results to explore the contribution of different diffusion pattern and swelling effect in sub- and super-critical CO2flow in nanoscale pores.