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    Natural gas density measurements and the impact of accuracy on process design

    Access Status
    Fulltext not available
    Embargo Lift Date
    2023-07-17
    Authors
    Al Ghafri, S.Z.S.
    Jiao, F.
    Hughes, T.J.
    Arami-Niya, Arash
    Yang, X.
    Siahvashi, A.
    Karimi, A.
    May, E.F.
    Date
    2021
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Al Ghafri, S.Z.S. and Jiao, F. and Hughes, T.J. and Arami-Niya, A. and Yang, X. and Siahvashi, A. and Karimi, A. et al. 2021. Natural gas density measurements and the impact of accuracy on process design. Fuel. 304: Article No. 121395.
    Source Title
    Fuel
    DOI
    10.1016/j.fuel.2021.121395
    ISSN
    0016-2361
    Faculty
    Faculty of Science and Engineering
    School
    WASM: Minerals, Energy and Chemical Engineering
    Funding and Sponsorship
    http://purl.org/au-research/grants/arc/IC150100019
    URI
    http://hdl.handle.net/20.500.11937/85085
    Collection
    • Curtin Research Publications
    Abstract

    The liquefaction of natural gas is an energy intensive process, requiring at least 5% of the energy associated with methane's lower heating value. Key to estimating and optimizing these energy requirements are process simulations which rely upon calculated thermophysical properties of the natural gas. In particular, the prediction of thermophysical properties of natural gas mixtures at pressure-temperature conditions close to the mixture's critical point or cricondenbar is challenging but important as often natural gas processes operate close to these conditions. In this work, we present a comprehensive study of two natural gas related systems: (CH4 + C3H8 + CO2) and (CH4 + C3H8 + C7H16) with n-heptane fractions up to 15 mol%. High accuracy measurements of densities, at temperatures from 200 K to 423 K and pressures up to 35 MPa are presented. The extensive experimental data collected for these mixtures were compared with the GERG-2008 equation of state, as implemented in the NIST software REFPROP. The relative deviations of the measured densities from those calculated using the GERG-2008 model range between (−2 to 4)% for all mixtures, presenting a systematic dependent on mixture density and n-heptane content. Finally, a case study is presented that probes the impact of the accuracy of density on the pinch point in a simulated LNG heat exchanger. An uncertainty in the density of 1% is shown to cause significant 30% reduction in the minimum approach temperature difference, suggesting that accurate thermophysical property calculations are key to reducing over-design of processing plant.

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