A 2-D CFD model for the decompression of carbon dioxide pipelines using the Peng-Robinson and the Span-Wagner equation of state
| Autor: | Charles J. Glover, Delphine Laboureur, Tatiana Flechas |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
021110 strategic
defence & security studies Phase transition Equation of state Work (thermodynamics) Environmental Engineering Vapor pressure business.industry General Chemical Engineering 0211 other engineering and technologies 02 engineering and technology Mechanics 010501 environmental sciences Computational fluid dynamics Flashing 01 natural sciences Pipeline transport Cabin pressurization Environmental Chemistry Environmental science Safety Risk Reliability and Quality business 0105 earth and related environmental sciences |
| Zdroj: | Process Safety and Environmental Protection. 140:299-313 |
| ISSN: | 0957-5820 |
| DOI: | 10.1016/j.psep.2020.04.033 |
| Popis: | Pressurized liquefied gases such as carbon dioxide are transported at a pressure above their saturation pressure. Therefore, if a pipeline transporting this substance ruptures, an abrupt expansion occurs, causing the flashing of the fluid. Computational tools that predict how fast a depressurization develops, help to assess the consequences of potential pipeline rupture scenarios. This paper describes the development of a 2-D full-bore rupture decompression model to simulate the transient depressurization of a pipeline transporting pure liquefied CO2, using ANSYS Fluent as CFD software. The scope of work focuses on incorporating non-equilibrium phase transition, while addressing the calculation of properties for metastable liquid. Additionally, it includes the comparison of model predictions when implementing two thermodynamic approaches: the Peng-Robinson Equation of State (EoS), and correlations developed in this work based on the Span-Wagner EoS. It was found that the thermodynamic approach is deemed to have a predominant effect on the arrival time of the decompression wave front at different locations along the computational domain, while the mass transfer coefficient in the source terms (C) governs the phase transition and the pressure plateau representing this phenomenon. |
| Databáze: | OpenAIRE |
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