METHOD OF DETERMINING MIXED REFRIGERANT COMPOSITION FOR NATURAL GAS LIQUEFYING APPARATUS

Provided is a method capable of determining a mixed refrigerant composition suitable for new feed conditions for a natural gas even after at least one of feed conditions for the natural gas changes. In creating a model, a simulation model is created based on operation data acquired from a natural ga...

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Bibliographische Detailangaben
Hauptverfasser:	KANAMARU, TAKEHISA, LEONG, AUN KANG
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:	Provided is a method capable of determining a mixed refrigerant composition suitable for new feed conditions for a natural gas even after at least one of feed conditions for the natural gas changes. In creating a model, a simulation model is created based on operation data acquired from a natural gas liquefying apparatus when feed conditions for the natural gas are determined to obtain a liquefied natural gas cooled to a preset temperature from the natural gas liquefying apparatus. In calculating a UA value, a UA value of a cryogenic heat exchanger is calculated through execution of the simulation model. In preliminarily calculating, total power consumption is calculated through execution of the simulation model for a plurality of mixed refrigerant cases where a composition of the refrigerant components is different, under the new feed conditions for the natural gas. In determining a composition, a mixed refrigerant composition of a mixed refrigerant case where total power consumption per unit rate of the liquefied natural gas becomes smallest is set as a mixed refrigerant composition under the new feed conditions.