Liquefied natural gas (LNG) is an energy source with worldwide steady growth: natural gas supply, as gas demand, is expected to grow in the near future. LNG is stored in tanks at pressure slightly higher than the atmospheric value and at its boiling point. Despite the high degree of insulation in the tank walls, it is impossible to avoid a net input heat transfer from the surroundings, so that vaporization is always present. It causes an increase in the pressure of the tank and a consequent boiloff in order to avoid overpressure. The change in composition and density of the liquid phase is called LNG aging or weathering. This phenomenon has been studied in order to obtain a model that can predict the variations that occur in the tank over time. Unlike other previously developed models, the proposed model does not require knowledge of the boiloff rate; instead, it calculates the rate directly from the heat flow to the tank. As a consequence, from a comparison with experimental data, it is proved that a more reliable representation of the phenomenon can be obtained.

LNG Technology: The Weathering in Above-Ground Storage Tanks

PELLEGRINI, LAURA ANNAMARIA;MOIOLI, STEFANIA;
2014

Abstract

Liquefied natural gas (LNG) is an energy source with worldwide steady growth: natural gas supply, as gas demand, is expected to grow in the near future. LNG is stored in tanks at pressure slightly higher than the atmospheric value and at its boiling point. Despite the high degree of insulation in the tank walls, it is impossible to avoid a net input heat transfer from the surroundings, so that vaporization is always present. It causes an increase in the pressure of the tank and a consequent boiloff in order to avoid overpressure. The change in composition and density of the liquid phase is called LNG aging or weathering. This phenomenon has been studied in order to obtain a model that can predict the variations that occur in the tank over time. Unlike other previously developed models, the proposed model does not require knowledge of the boiloff rate; instead, it calculates the rate directly from the heat flow to the tank. As a consequence, from a comparison with experimental data, it is proved that a more reliable representation of the phenomenon can be obtained.
File in questo prodotto:
File Dimensione Formato  
ie404128d.pdf

Accesso riservato

: Altro materiale allegato
Dimensione 1.07 MB
Formato Adobe PDF
1.07 MB Adobe PDF   Visualizza/Apri
LNG technology The weathering in above-groud storage tanks_11311-812749_Pellegrini.pdf

accesso aperto

: Post-Print (DRAFT o Author’s Accepted Manuscript-AAM)
Dimensione 1.04 MB
Formato Adobe PDF
1.04 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11311/812719
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 43
  • ???jsp.display-item.citation.isi??? 36
social impact