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Energies 2018, 11(11), 3019; https://doi.org/10.3390/en11113019

Efficiency and Losses Analysis of Steam Air Heater from Marine Steam Propulsion Plant

1
Maritime Department, University of Zadar, Mihovila Pavlinovića 1, 23000 Zadar, Croatia
2
Faculty of Engineering, University of Rijeka, Vukovarska 58, 51000 Rijeka, Rijeka
*
Author to whom correspondence should be addressed.
Received: 1 October 2018 / Revised: 25 October 2018 / Accepted: 29 October 2018 / Published: 2 November 2018
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Abstract

Air heaters are commonly used devices in steam power plants. In base-loaded conventional power plants, air heaters usually use flue gases for air heating. In this paper, the air heater from a marine steam propulsion plant is analyzed, using superheated steam as a heating medium. In a marine propulsion plant, flue gases from steam generator are not hot enough for the air heating process. In a wide range of steam system loads, the analyzed steam air heater has low energy power losses and high energy efficiencies, ranging from 98.41% to 99.90%. Exergy analysis of the steam air heater showed that exergy destruction is quite high, whereas exergy efficiency ranged between 46.34% and 67.14%. Air heater exergy destruction was the highest, whereas exergy efficiency was the lowest at the highest steam system loads, which was an unexpected occurrence because the highest loads can be expected in the majority of marine steam plant operations. The change in the ambient temperature significantly influences steam air heater exergy efficiency. An increase in the ambient temperature of 10 °C reduces analyzed air heater exergy efficiency by 4.5%, or more, on average. View Full-Text
Keywords: steam air heater; energy power losses; energy efficiency; exergy destruction; exergy efficiency steam air heater; energy power losses; energy efficiency; exergy destruction; exergy efficiency
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Orović, J.; Mrzljak, V.; Poljak, I. Efficiency and Losses Analysis of Steam Air Heater from Marine Steam Propulsion Plant. Energies 2018, 11, 3019.

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