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A STUDY OF SOLID CO2 FORMATION FROM RAPID FLUID EXPANSION USING CFD AND MATHEMATICAL MODELLING

EDDIE, CHANG JEE TED (2013) A STUDY OF SOLID CO2 FORMATION FROM RAPID FLUID EXPANSION USING CFD AND MATHEMATICAL MODELLING. Universiti Teknologi PETRONAS. (Unpublished)

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Abstract

Rapid carbon dioxide expansion from an accidental pipeline leakage is an adiabatic process that forms solid CO2 micro-particles entrained in CO2 vapor. While the vapor is subsequently dispersed as vapor cloud, the micro-particles – at sizes larger than 100 μm – can rain out to form a solid pool. The pool will then sublimate to the atmosphere and contribute significantly to the concentration of vapor cloud. Ultimately, the effect of solid rainout pool on vapor cloud concentration and dispersion has to be taken into consideration when calculating safety distance. In order to investigate the sizes of solid micro-particles formed under varying discharge scenarios, the process of rapid fluid expansion through an orifice (leakage) is emulated using a simulation model. It involves an integration of two sub-models: (1) a 3-D Computational Fluid Dynamics (CFD) model using FLUENT 14.0, and (2) a mathematical model published by authors Hulsbosch-Dam, Spruijt, Necci & Cozzani (2012). The CFD model employs the FLUENT software to obtain temperature and velocity profiles of rapid fluid expansion. The mathematical model calculates the droplet size distribution from the point of release and size of final solid particles formed. The combination of the two models generates results and parametric trends (mainly the effect of leakage size on the size of particles formed). They are then compared with experimental data available in literatures, and validation is achieved. Finally, the model is used to simulate rapid carbon dioxide expansion from pipeline leakage at supercritical storage conditions. Conclusive evidence shows that at supercritical storage conditions (specifically at 310 K and 150 bar), a pipeline leakage will not produce solid CO2 micro-particles big enough to form a solid rainout pool.

Item Type: Final Year Project
Academic Subject : Academic Department - Chemical Engineering - Separation Process
Subject: T Technology > TP Chemical technology
Divisions: Engineering > Chemical
Depositing User: Users 2053 not found.
Date Deposited: 09 Oct 2013 11:07
Last Modified: 09 Oct 2013 11:07
URI: http://utpedia.utp.edu.my/id/eprint/8430

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