CFD Of Liquefied Natural Gas (LNG) behaviour during tank filling

Fu, Fang Xiong (2013) CFD Of Liquefied Natural Gas (LNG) behaviour during tank filling. Project Report. UTeM, Melaka. (Submitted)

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Abstract

Rollover happen when two stratified Liquefied Natural Gas (LNG) reaches density equilibrium and release large amount of vapor in short period causing over-pressurization of the storage tank. The novelty of the present work is to study the relationship between stratification effect with the independent parameter of filling rate, density condition and initial depth of heel LNG by using Computational Fluids Dynamic (CFD) software. A brief of LNG in term of formation, composition, advantages and current LNG market were presented at the first section. Present study also focuses on the review of stratification, different composition effect, filling method and behavior, heat leakage and rollover in both numerical and experimental way. For validity, Koyama (2008)’s paper was selected to perform validation test by using ANSYS Fluent software and a relative percentage error of 8.76 was obtained showing well agreement between present study simulation with experimental result did by Koyama(2008). The independent parameters (filling rate, initial depth of heel LNG, and density condition) effect on stratification was discussed detailed at the result and discussion session. Generally, case study simulation result shows that lower filling rate, deeper height of heel LNG, and smaller initial density difference between two LNG are recommended to reduce stratification level. This present study was end with the conclusion of finding and recommendation of future study.

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