Abstract
The objective of energy production with low environmental impact will have, in the near future, high potential of development also for naval applications. The containment of pollutant emissions can be achieved by the combined use of an innovative mini gas-steam combined cycle with thermal energy cogeneration to feed the ship thermal utilities, in place of the current Diesel engine application, and liquefied natural gas as fuel (LNG). The present work is focused on the definition of the architecture of the plant, by selecting optimal distribution of pressure and temperature and repartition of power between Gas Turbine (GT), Steam Turbine (ST) and thermal utilities, as well as on the choice and sizing of the individual components. The main purpose is the definition of a compact, high efficiency, system. The proposed basic mini-cycle ranges from 2 MW to 10 MW electric power. Thanks to the combined heat and power cogeneration plant adopted, for an overall electrical efficiency of about 30%, a total return (thermal + electricity) of about 75% can be achieved. An example of plant providing large power, in a partially modular arrangement is also proposed.
Highlights
In the shipbuilding sector, a great effort is made to achieve a significant reduction of the pollutant emissions produced by the engines used for the generation of electric and thermal energy on board of the ships
A compact mini combined cycle for naval applications has been designed with the aim of defining a cycle characterized by a good electrical efficiency, a high cogeneration efficiency, and an adequate production of low pressure steam, within a plant size range between 2 and 10 MWel
The proposed basic mini-cycle consists of a gas turbine (GT), a heat recovery steam generator (HRSG), a steam turbine and a heat user which receive the steam at the pressure of 3 bar
Summary
A great effort is made to achieve a significant reduction of the pollutant emissions produced by the engines used for the generation of electric and thermal energy on board of the ships. Based on the aforementioned premises, a mini sized power plant can find different applications in the naval field, as the prime mover of small size vessels, and to be adopted in modular solutions for larger applications This modular concept can be used for overcoming the efficiency drop occurring in gas turbines when the loading is strongly reduced, or to fulfil the need for redundancy on board, or again as auxiliary apparatus in large vessels for particular operating conditions. Besides the naval applications on which the paper focus, the same combined cycle can be used for equivalent land or off shore uses
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