Reliquefaction of boil-off from liquefied natural gas

The present invention relates to an improved process for the reliquefaction of boil-off gas (1) containing up to 10% nitrogen resulting from the evaporation of liquefied natural gas (LNG) contained in a storage vessel. In the process, a closed-loop nitrogen refrigeration cycle is utilized wherein th...

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Bibliographische Detailangaben
Hauptverfasser:	KOVAK, KENNETH W, STUBER, WAYNE G
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING COMBINED HEATING AND REFRIGERATION SYSTEMS HEAT PUMP SYSTEMS HEATING LIGHTING LIQUEFACTION SOLIDIFICATION OF GASES LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS MANUFACTURE OR STORAGE OF ICE MECHANICAL ENGINEERING MIXTURES BY PRESSURE AND COLD TREATMENT REFRIGERATION OR COOLING WEAPONS
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Beschreibung
Zusammenfassung:	The present invention relates to an improved process for the reliquefaction of boil-off gas (1) containing up to 10% nitrogen resulting from the evaporation of liquefied natural gas (LNG) contained in a storage vessel. In the process, a closed-loop nitrogen refrigeration cycle is utilized wherein the nitrogen is isenthalpically expanded (108) under conditions for generating a liquid and vapor with the liquid (15) being pressurized by pumping and warmed against an initially cooled boil-off stream (3). The boil-off LNG stream (2) is initially cooled by indirect heat exchange with an isentropically expanded refrigerant stream (33).