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HYDRODYNAMICS AND SEPARATION PERFORMANCE ANALYSIS OF HORIZONTAL, INLINE, SWIRL TUBE SEPARATOR FOR NATURAL GAS - WATER SEPARATION FOR POTENTIAL OFFSHORE APPLICATION

MELLON, NURHAYATI (2012) HYDRODYNAMICS AND SEPARATION PERFORMANCE ANALYSIS OF HORIZONTAL, INLINE, SWIRL TUBE SEPARATOR FOR NATURAL GAS - WATER SEPARATION FOR POTENTIAL OFFSHORE APPLICATION. PhD thesis, UNIVERSITI TEKNOLOGI PETRONAS.

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Abstract

The preference of the conventional separator over the advance horizontal, inline swirl tube separator is mainly due to the lack of data on the hydrodynamics and separation performance of the advance separator, especially at high pressure condition and high gas mass flow rate. Currently, the performance analysis is usually done at a scaled down condition, often using representative fluid resulting in under prediction on the separation performance of the separator under actual operating condition. This research was carried out to evaluate the hydrodynamics and separation performance of an inline, swirl tube separator operating at high pressure condition using natural gas and water as the operating fluid. The test facility was designed to handle a natural gas flow rate of up to 5900 sm3/hr (5 MMSCFD) with gas velocity of up to 15 m/s at operating pressure between 10 to 70 bars. Fine water droplets were injected at high pressure into the system to represent the liquid stream. Analysis showed that the separation is favourable at higher operating pressure due to the higher dynamic pressure in the gas stream. Separation performance of above 98 % is attainable with maximum pressure drop of less than 0.25 bars across the separator. Although the reentrainment criteria were met at operating pressure of above 50 bars, the occurrence of entrainment is very minimal. The incorporation of a similar swirl tube separator in series with the first swirl tube separator showed an improvement in the separation performance, giving a maximum free water removal with separation efficiency of 99.5+-0.5% at all range of operating condition considered. In conclusion, the hydrodynamics of the separator is affected by the operating pressure, the gas velocity and the incorporation of blanking plate at the separator inlet. The separation is favourable at high pressure and the separation efficiency is unaffected by the increase in gas velocity. Increasing liquid load through the separator saw an increase in separation efficiency initially up to liquid load of 0.5 vol/vol%, before it decrease slightly with further increase in liquid load. This study shows the potential of the compact separator to replace the gravity settler for gas-liquid separation where space and weight is a constraint.

Item Type: Thesis (PhD)
Subject: UNSPECIFIED
Divisions: UNSPECIFIED
Depositing User: Users 6 not found.
Date Deposited: 30 Jul 2012 14:19
Last Modified: 25 Jan 2017 09:40
URI: http://utpedia.utp.edu.my/id/eprint/3321

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