Modelling three-phase releases of carbon dioxide from high-pressure pipelines |
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| Affiliation: | 1. Department of Chemical Engineering, UCL, London WC1E 7JE, United Kingdom;2. Dalian University of Technology, Dalian, People''s Republic of China;1. Institute of Particle Science and Engineering, School of Process, Environmental and Materials Engineering, University of Leeds, Leeds LS2 9JT, UK;2. INERIS, Department PHDS, Parc Technologique ALATA, BP 2, 60550 Verneuil-en-Halatte, France;3. GexCon AS, PO Box 6015, Bergen Bedriftssenter, NO-5892 Bergen, Norway;4. School of Mathematics, University of Leeds, Leeds LS2 9JT, UK;5. Department of Chemical Engineering, University College London, London WC1E 7JE, UK;6. Health & Safety Laboratory, Harpur Hill, Buxton SK17 9JN, UK;7. National Center for Scientific Research “Demokritos”, Institute of Physical Chemistry, Molecular Thermodynamics and Modelling of Materials Laboratory, GR-153 10 Aghia Paraskevi Attikis, Greece;1. School of Chemical and Process Engineering, University of Leeds, Leeds LS2 9JT, UK;2. School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, UK;3. School of Mathematics, University of Leeds, Leeds LS2 9JT, UK;1. Department of Safety Science Engineering & State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui 230026, China;2. College of Mechanical Engineering and Automation, Huaqiao University, Jimei, Xiamen 361000, China;3. Engineering Department, Lancaster University, Lancaster LA1 4YR, UK;1. School of Chemical Machinery and Safety, Dalian University of Technology, Dalian 116024, China;2. School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China;3. Department of Chemical Engineering, University College London, London WC1E 7JE, UK;4. INERIS, Parc Technologique ALATA, BP 2, Verneuil-en-Halatte 60550, France;1. Health and Safety Laboratory, Harpur Hill, Buxton, Derbyshire SK17 9JN, UK;2. Health and Safety Executive, Redgrave Court, Merton Road, Bootle L20 7HS, UK;1. School of Process, Environmental and Materials Engineering, University of Leeds, Leeds LS2 9JT, UK;2. School of Mathematics, University of Leeds, Leeds LS2 9JT, UK |
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| Abstract: | This paper describes the development and experimental validation of a three-phase flow model for predicting the transient outflow following the failure of pressurised CO2 pipelines and vessels. The choked flow parameters at the rupture plane, spanning the dense-phase and saturated conditions to below the triple point, are modelled by maximisation of the mass flowrate with respect to pressure and solids mass fraction at the triple point. The pertinent solid/vapour/liquid phase equilibrium data are predicted using an extended Peng–Robinson equation of state.The proposed outflow model is successfully validated against experimental data obtained from high-pressure CO2 releases performed as part of the FP7 CO2PipeHaz project (www.co2pipehaz.eu).The formation of solid phase CO2 at the triple point is marked by a stabilisation in pressure as confirmed by both theory and experimental observation. For a fixed diameter hypothetical pipeline at 100 bar and 20 °C, the flow model is used to determine the impact of the pipeline length on the time taken to commence solid CO2 discharge following its rupture. |
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| Keywords: | Pipeline transportation Accidental discharge Choked flow Triple point Homogenous equilibrium model |
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