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A CFD decompression model for CO2 mixture and the influence of non-equilibrium phase transition

Author

Listed:
  • Liu, Bin
  • Liu, Xiong
  • Lu, Cheng
  • Godbole, Ajit
  • Michal, Guillaume
  • Tieu, Anh Kiet

Abstract

Carbon Capture and Storage (CCS) is widely seen asan effective technique to reduce what is perceived as excessive CO2 concentration in the atmosphere. This technique includes transporting CO2 from source point to the storage site, usually through high-pressure pipelines. In order to ensure safe transport (i.e. to prevent the contents from being released into the atmosphere), it is important to estimate the required pipe toughness in the design stage. This requires an accurate prediction of the speed of the ‘decompression wave’ in the fluid, which is created when the high-pressure fluid escapes into the ambient. In this paper, a multi-phase Computational Fluid Dynamics (CFD) model is presented to simulate the decompression of high-pressure pipelines carrying CO2 mixtures. A ‘real gas’ Equation of State (EOS), the GERG-2008 EOS, is incorporated into the CFD code to model the thermodynamic properties of the fluid in both liquid and vapour states. The non-equilibrium liquid/vapour transition is modelled by introducing ‘source terms’ for mass transfer and latent heat. The model is validated through simulation of a ‘shock tube’ test. A ‘time relaxation factor’ is used to control the inter-phase mass transfer rate. The measured decompression wave speed is compared with that predicted using different values of the time relaxation factor. It is found that the non-equilibrium phase transition has a significant influence on the decompression wave speed. Also, the effects of delayed bubble formation and of various impurities on the decompression wave speed are investigated.

Suggested Citation

  • Liu, Bin & Liu, Xiong & Lu, Cheng & Godbole, Ajit & Michal, Guillaume & Tieu, Anh Kiet, 2018. "A CFD decompression model for CO2 mixture and the influence of non-equilibrium phase transition," Applied Energy, Elsevier, vol. 227(C), pages 516-524.
    • Handle: RePEc:eee:appene:v:227:y:2018:i:c:p:516-524
    DOI: 10.1016/j.apenergy.2017.09.016
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    References listed on IDEAS

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    1. Haroun Mahgerefteh & Solomon Brown & Sergey Martynov, 2012. "A study of the effects of friction, heat transfer, and stream impurities on the decompression behavior in CO 2 pipelines," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 2(5), pages 369-379, October.
    2. Liu, Xiong & Godbole, Ajit & Lu, Cheng & Michal, Guillaume & Venton, Philip, 2014. "Source strength and dispersion of CO2 releases from high-pressure pipelines: CFD model using real gas equation of state," Applied Energy, Elsevier, vol. 126(C), pages 56-68.
    3. Tola, Vittorio & Pettinau, Alberto, 2014. "Power generation plants with carbon capture and storage: A techno-economic comparison between coal combustion and gasification technologies," Applied Energy, Elsevier, vol. 113(C), pages 1461-1474.
    4. Elshahomi, Alhoush & Lu, Cheng & Michal, Guillaume & Liu, Xiong & Godbole, Ajit & Venton, Philip, 2015. "Decompression wave speed in CO2 mixtures: CFD modelling with the GERG-2008 equation of state," Applied Energy, Elsevier, vol. 140(C), pages 20-32.
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    Cited by:

    1. Ding, Hongbing & Zhang, Yu & Dong, Yuanyuan & Wen, Chuang & Yang, Yan, 2023. "High-pressure supersonic carbon dioxide (CO2) separation benefiting carbon capture, utilisation and storage (CCUS) technology," Applied Energy, Elsevier, vol. 339(C).
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