Original scientific paper

https://doi.org/10.31217/p.33.1.8

Exergy analysis of marine steam turbine labyrinth (gland) seals

Ivan Lorencin orcid.org/0000-0002-5964-245X ; University of Rijeka, Faculty of Engineering, Rijeka, Croatia
Nikola Anđelić orcid.org/0000-0002-0314-243X ; University of Rijeka, Faculty of Engineering, Rijeka, Croatia
Vedran Mrzljak orcid.org/0000-0003-0323-2600 ; University of Rijeka, Faculty of Engineering, Rijeka, Croatia
Zlatan Car orcid.org/0000-0003-2817-9252 ; University of Rijeka, Faculty of Engineering, Rijeka, Croatia

Abstract

The paper presents an exergy analysis of marine steam turbine labyrinth (gland) seals - an inevitable component of any marine steam turbine cylinder, in three different operating regimes. Throughout labyrinth seals, steam specific enthalpy can be considered as a constant because the results obtained by this assumption do not deviate significantly from the results of complex numerical models. Changes in labyrinth seals exergy efficiency and specific exergy destruction are reverse proportional. The analyzed labyrinth seals have high exergy efficiencies in each observed operating regime at the ambient temperature of 298 K (above 92%), what indicates seals proper operation. An increase in the ambient temperature resulted with a decrease in labyrinth seals exergy efficiency, but even at the highest observed ambient temperature of 318 K, seals exergy efficiency did not fall below 90.5% in each observed operating regime.

Keywords

Marine steam turbine; land seals; Exergy loss; Exergy efficiency

Hrčak ID:

221414

URI

https://hrcak.srce.hr/221414

Publication date:

28.6.2019.

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