基于非理想气体流动模拟的无烟煤纳米孔隙中CH4流动规律

Translated title of the contribution: The flow behavior of CH4 in nanopores of anthracite coal based on a non-ideal gas-flow simulation

Shiqi Liu, Shuxun Sang, Jingsheng Ma, X. Wang, Huihuang Fang, He Wang, Deyi Gao

Research output: Contribution to journalArticle

Abstract

Based on the nanoscale pore-network flow model (PNFM) of anthracite coal collected from the southern Qinshui Basin, a non-ideal gas-flow simulation of CH4 was carried out considering slip flow, diffusion, gas desorption/adsorption and Darcy flow. The apparent permeability of nanopores in anthracite coal and the microscopic flow behavior of CH4 were discussed. The results show that the non-ideal gas-flow model quantifies the effects of slip flow, diffusion and gas properties on apparent permeability. The apparent permeability of nanopores in anthracite coal is greater than the Darcy permeability affected by slip flow and diffusion of CH4. The apparent permeability exhibits negative exponential relationships with the tangential momentum accommodation coefficient (β), gas pressure, and pore width. Knudsen number has a nonlinear increasing trend with the decrease in gas pressure and pore width, causing a nonlinear relationship between apparent permeability and gas pressure. Moreover, the slip coefficient increases with the decrease in the β and gas pressure. When β<0.1 and gas pressure ≤8 MPa, the effects of slip flow and diffusion on CH4 migration in mesopores and macropores with a width of 50-100 nm increases rapidly, which is crucial for the efficiency of CH4 production and CBM exploitation.

Translated title of the contributionThe flow behavior of CH4 in nanopores of anthracite coal based on a non-ideal gas-flow simulation
Original languageChinese
Pages (from-to)36-43
Number of pages8
JournalZhōngguó Kuàngyè Dàxué Xuébào
Volume49
Issue number1
Publication statusPublished - 2020

Keywords

  • Apparent permeability
  • Darcy permeability
  • Diffusion
  • Pore-network flow model
  • Slip flow

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Geotechnical Engineering and Engineering Geology
  • Geology
  • Mechanical Engineering

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