Cold Energy Storage for Boil-off Gas On-Board Reliquefaction

The increase in energy demand and the need for lower CO2 emissions have increased the importance of natural gas as the cleanest fossil fuel in the energy market. Natural gas is mainly transported using pipelines or as liquefied natural gas (LNG). LNG is stored and transported in cryogenic storage ta...

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Autores principales:	Ghiwa Shakrina, Rodrigo Rivera-Tinoco, Chakib Bouallou
Formato:	article
Lenguaje:	EN
Publicado:	AIDIC Servizi S.r.l. 2021
Materias:	Chemical engineering TP155-156 Computer engineering. Computer hardware TK7885-7895
Acceso en línea:	https://doaj.org/article/d8b9c478633446718ab3fbefcbcd795c
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id	oai:doaj.org-article:d8b9c478633446718ab3fbefcbcd795c
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spelling	oai:doaj.org-article:d8b9c478633446718ab3fbefcbcd795c2021-11-15T21:47:30ZCold Energy Storage for Boil-off Gas On-Board Reliquefaction10.3303/CET21881532283-9216https://doaj.org/article/d8b9c478633446718ab3fbefcbcd795c2021-11-01T00:00:00Zhttps://www.cetjournal.it/index.php/cet/article/view/11946https://doaj.org/toc/2283-9216The increase in energy demand and the need for lower CO2 emissions have increased the importance of natural gas as the cleanest fossil fuel in the energy market. Natural gas is mainly transported using pipelines or as liquefied natural gas (LNG). LNG is stored and transported in cryogenic storage tankers, where a part of the LNG evaporates, generating boil-off gas (BOG). The BOG is used normally as fuel for propulsion engines, but at low navigation speed, it is more than the engines’ fuel needs, and the excess quantity is either burnt or reliquefied. Existing technologies for on-board reliquefaction consume a large amount of energy and are costly, which arises the need for new concepts of reliquefaction technologies. The new proposed system operates on two modes; the first is the charging mode in which cold energy is stored when the LNG is evaporated to supply the LNG carrier propulsion system at high speed. The second is the discharging mode, in which the stored cold energy is used to condense the excess BOG at low navigation speed. The novel reliquefaction system utilizes latent or sensible heat storage materials that haven’t been examined before for cryogenic applications. A preliminary energetic assessment for the system is carried out using Aspen HYSYS, Excel and VBA, to study the impact of the variation of the operating conditions on the choice of suitable storage material and its performance. Results showed that low LNG evaporation and high BOG liquefaction pressures offer higher energy storage capacity for all types of thermal energy materials, with better performance for the latent ones. Further investigation on this technology helps in providing a suitable replacement for the costly available reliquefaction systems and avoids the burning of BOG with its consequent high CO2 emissions.Ghiwa ShakrinaRodrigo Rivera-TinocoChakib BouallouAIDIC Servizi S.r.l.articleChemical engineeringTP155-156Computer engineering. Computer hardwareTK7885-7895ENChemical Engineering Transactions, Vol 88 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Chemical engineering TP155-156 Computer engineering. Computer hardware TK7885-7895
spellingShingle	Chemical engineering TP155-156 Computer engineering. Computer hardware TK7885-7895 Ghiwa Shakrina Rodrigo Rivera-Tinoco Chakib Bouallou Cold Energy Storage for Boil-off Gas On-Board Reliquefaction
description	The increase in energy demand and the need for lower CO2 emissions have increased the importance of natural gas as the cleanest fossil fuel in the energy market. Natural gas is mainly transported using pipelines or as liquefied natural gas (LNG). LNG is stored and transported in cryogenic storage tankers, where a part of the LNG evaporates, generating boil-off gas (BOG). The BOG is used normally as fuel for propulsion engines, but at low navigation speed, it is more than the engines’ fuel needs, and the excess quantity is either burnt or reliquefied. Existing technologies for on-board reliquefaction consume a large amount of energy and are costly, which arises the need for new concepts of reliquefaction technologies. The new proposed system operates on two modes; the first is the charging mode in which cold energy is stored when the LNG is evaporated to supply the LNG carrier propulsion system at high speed. The second is the discharging mode, in which the stored cold energy is used to condense the excess BOG at low navigation speed. The novel reliquefaction system utilizes latent or sensible heat storage materials that haven’t been examined before for cryogenic applications. A preliminary energetic assessment for the system is carried out using Aspen HYSYS, Excel and VBA, to study the impact of the variation of the operating conditions on the choice of suitable storage material and its performance. Results showed that low LNG evaporation and high BOG liquefaction pressures offer higher energy storage capacity for all types of thermal energy materials, with better performance for the latent ones. Further investigation on this technology helps in providing a suitable replacement for the costly available reliquefaction systems and avoids the burning of BOG with its consequent high CO2 emissions.
format	article
author	Ghiwa Shakrina Rodrigo Rivera-Tinoco Chakib Bouallou
author_facet	Ghiwa Shakrina Rodrigo Rivera-Tinoco Chakib Bouallou
author_sort	Ghiwa Shakrina
title	Cold Energy Storage for Boil-off Gas On-Board Reliquefaction
title_short	Cold Energy Storage for Boil-off Gas On-Board Reliquefaction
title_full	Cold Energy Storage for Boil-off Gas On-Board Reliquefaction
title_fullStr	Cold Energy Storage for Boil-off Gas On-Board Reliquefaction
title_full_unstemmed	Cold Energy Storage for Boil-off Gas On-Board Reliquefaction
title_sort	cold energy storage for boil-off gas on-board reliquefaction
publisher	AIDIC Servizi S.r.l.
publishDate	2021
url	https://doaj.org/article/d8b9c478633446718ab3fbefcbcd795c
work_keys_str_mv	AT ghiwashakrina coldenergystorageforboiloffgasonboardreliquefaction AT rodrigoriveratinoco coldenergystorageforboiloffgasonboardreliquefaction AT chakibbouallou coldenergystorageforboiloffgasonboardreliquefaction
_version_	1718426814518394880

Cold Energy Storage for Boil-off Gas On-Board Reliquefaction

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