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Open AccessArticle

Analysis and Optimization of Atmospheric Drain Tank of Lng Carrier Steam Power Plant

1
Department of Maritime Sciences, University of Zadar, Mihovila Pavlinovića 1, 23000 Zadar, Croatia
2
Faculty of Engineering, University of Rijeka, Vukovarska 58, 51000 Rijeka, Croatia
*
Author to whom correspondence should be addressed.
J. Mar. Sci. Eng. 2020, 8(8), 568; https://doi.org/10.3390/jmse8080568
Received: 3 June 2020 / Revised: 25 July 2020 / Accepted: 25 July 2020 / Published: 28 July 2020
(This article belongs to the Special Issue Marine Power Systems)
The atmospheric drain condensate system of a marine steam power plant is described and evaluated from the energetic and exergetic point of view at a conventional liquefied natural gas (LNG) carrier. Energy loss and exergy destruction rate were calculated for individual stream flows joined in an atmospheric drain tank with variations of the main turbine propulsion speed rate. The energy efficiency of joining streams was noted to be above 98% at all observed points as the atmospheric drain tank was the direct heater. The exergy efficiency of the stream flows into the drain tank was in the range of 80% to 90%. The exergy stream flow to the tank was modeled and optimized by the gradient reduced gradient (GRG) method. Optimization variables comprised contaminated and clean condensate temperature of the atmospheric drain tank and distillate water inlet to the atmospheric drain tank with respect to condensate outlet temperature. The optimal temperatures improves the exergy efficiency of the tank as direct heater, to about 5% in port and 3% to 4% when the LNG carrier was at sea, which is the aim of optimizing. Proposals for improvement and recommendations are given for proper plant supervision, which may be implemented in real applications. View Full-Text
Keywords: atmospheric drain tank; energy analysis; exergy analysis; optimization atmospheric drain tank; energy analysis; exergy analysis; optimization
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MDPI and ACS Style

Poljak, I.; Bielić, T.; Mrzljak, V.; Orović, J. Analysis and Optimization of Atmospheric Drain Tank of Lng Carrier Steam Power Plant. J. Mar. Sci. Eng. 2020, 8, 568. https://doi.org/10.3390/jmse8080568

AMA Style

Poljak I, Bielić T, Mrzljak V, Orović J. Analysis and Optimization of Atmospheric Drain Tank of Lng Carrier Steam Power Plant. Journal of Marine Science and Engineering. 2020; 8(8):568. https://doi.org/10.3390/jmse8080568

Chicago/Turabian Style

Poljak, Igor; Bielić, Toni; Mrzljak, Vedran; Orović, Josip. 2020. "Analysis and Optimization of Atmospheric Drain Tank of Lng Carrier Steam Power Plant" J. Mar. Sci. Eng. 8, no. 8: 568. https://doi.org/10.3390/jmse8080568

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