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LNG Carrier Steam Dump Process Analysis

Igor Poljak ; University of Zadar, Department of Maritime Sciences
Jelena Čulin orcid id ; University of Zadar, Department of Maritime Sciences
Vedran Mrzljak orcid id ; University of Rijeka, Faculty of Engineering *
Vlatko Knežević orcid id

* Autor za dopisivanje.

Puni tekst: engleski pdf 1.023 Kb

str. 31-46

preuzimanja: 0



At the conventional LNG (Liquefied Natural Gas) carrier during the port operation, maintaining cargo
tank pressure can be a challenging task. This task can be obtained through steam dump only, if the
superheated steam line is not in operation. This paper presents an analysis of a steam dump process
from a conventional LNG carrier. It is shown that steam dump process produces around 8 times lower
harmful environmental emissions than releasing pure methane in the atmosphere. Simultaneously,
steam produced by gas combustion must be mixed with feed water to ensure its dry saturation – only
saturated steam can condense in the main condenser. The paper shows feed water mass flow rate
calculation procedure at various desuperheated steam mass flow rates and temperatures to ensure
proper dry saturation process. Also, the exergy destruction and exergy efficiency of the feed water
and desuperheated steam mixing process are calculated, presented and discussed.

Ključne riječi

Steam dump, Global warming potential, Conventional LNG carrier, Energy balancing, Exergy analysis

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