Optimization of Butane Boil off Gas Re-Liquefaction Process Using Alternative Technique to Conventional Refrigeration System.

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Bibliographic Details
Title:	Optimization of Butane Boil off Gas Re-Liquefaction Process Using Alternative Technique to Conventional Refrigeration System.
Authors:	Ali, Alaa M.¹ Alaamamdouh865@gmail.com, Omar, Walaa A. E.², Emam, Eman A.²
Source:	Petroleum & Coal. 2025, Vol. 67 Issue 2, p574-587. 14p.
Subject Terms:	Butane, Energy consumption, Condensation, Heat exchanger efficiency, Refrigeration & refrigerating machinery, Simulation software, Energy conservation, Vaporization
Abstract:	Improving energy efficiency is a critical issue related to the boil-off gas phenomenon that occurs inside a cryogenic hydrocarbon fixed tank as a result of temperature differences between the tank and the surrounding climate. Software Aspen HYSYS and UniSim Design were used to model the re-liquefaction process by modifying the pure propane refrigeration closed loop, which represents a part of the reliquefaction process of butane, with an economizer heat exchanger. The inlet stream of the economizer will be divided into two inlets. The JT-valve will be fitted on one inlet to reduce the temperature and pressure of the stream, which will work as the cooling stream. The results of the modified process showed an improvement in the overall performance of the BOG re-liquefaction process, reducing the environmental impact of the refrigeration loop and saving consumed energy. Also, the operating conditions for the process after enhancement are nearly identical to the existing process. Butane recovered temperature after applying the modification is equal to -2°C, which is approximately equal to the butane storage temperature. The modification saves approximately 24% of the consumed power for the re-liquefaction process. [ABSTRACT FROM AUTHOR]
Database:	Energy & Power Source

Description
Abstract:	Improving energy efficiency is a critical issue related to the boil-off gas phenomenon that occurs inside a cryogenic hydrocarbon fixed tank as a result of temperature differences between the tank and the surrounding climate. Software Aspen HYSYS and UniSim Design were used to model the re-liquefaction process by modifying the pure propane refrigeration closed loop, which represents a part of the reliquefaction process of butane, with an economizer heat exchanger. The inlet stream of the economizer will be divided into two inlets. The JT-valve will be fitted on one inlet to reduce the temperature and pressure of the stream, which will work as the cooling stream. The results of the modified process showed an improvement in the overall performance of the BOG re-liquefaction process, reducing the environmental impact of the refrigeration loop and saving consumed energy. Also, the operating conditions for the process after enhancement are nearly identical to the existing process. Butane recovered temperature after applying the modification is equal to -2°C, which is approximately equal to the butane storage temperature. The modification saves approximately 24% of the consumed power for the re-liquefaction process. [ABSTRACT FROM AUTHOR]
ISSN:	13353055