In English

Combined gas- and steam turbine as prime mover in marine applications

Sebastian Packalén ; Niklas Karlsson Nord
Göteborg : Chalmers tekniska högskola, 2017. 49 s.
[Examensarbete på grundnivå]

The gas turbines are known to have good efficiency when used in combined cycle configurations and has been used for ship propulsion in different types of vessels; mainly naval vessels, cruise ships and fast ferries. Still, diesel engines are by far the most common type of engines used for ship propulsion today. Due to some characteristics of the gas turbine, for example the poor efficiency at low loads; not all types of vessels are suitable to use this propulsion system. This study aims to investigates the use of a combined gas- and steam turbine configuration for propulsion and for which types of vessels it would be suitable when considering engine power, emission regulations, trade routes and technical aspects. Since the industry is facing changes due to the upcoming emission regulations in 2020 this study also looks at two different fuels, liquified natural gas (LNG) and marine diesel oil/marine gas oil (MDO/MGO) for gas turbine propulsion in terms of performance, efficiency and environmental impact. The result is achieved from a combination of scientific articles and an interview performed at Siemens Industrial Turbomachinery AB in Finspång. It reveals that a vessel with a gas turbine as prime mover is most suitable at vessels operating at longer voyages, less time at part-load and as few starts and stops as possible. To increase the efficiency and compete with the diesel engine even at part loads the gas turbine should be in combined gas and steam systems like COGES or COGAS. The fuel most suitable for gas turbine propulsion is natural gas; the difference compared to diesel in terms of efficiency and performance is small but the gaseous fuel is advantageous when looking at specific fuel consumption (SFC), power output and emissions.

Nyckelord: Gas turbine, steam turbine, COGES, COGAS, Siemens, emissions, efficiency, ship propulsion

Publikationen registrerades 2017-06-28. Den ändrades senast 2017-06-28

CPL ID: 250183

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