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Rendez-vous du Monde Maritime – 11 mars 2015
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Avantages/Inconvénients
Gaz Naturel
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Propulsions Disponibles
Utilisant le Gaz Naturel Comme Carburant
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Steam turbine vs T/DFDE Engines
Benefits
•Higher efficiency compared to steam
propulsion (but lower compared to slow
speed diesel options)
•Higher availability of experienced crew
comparing to steam turbine
•High propulsion redundancy (with back up
engine)
•Reduced emissions
Disadvantages:
• Higher capital cost TFDE
• Higher maintenance as a result of more
moving parts, higher speed and more
cylinders
• About 10 or 12% efficiency loss in the electric
power generation process
• Sensitive to gas quality: knocking with
automatic load reduction
• Crew member are not trained to operate
electrical equipment and a large part of
failure need experimented makers
• Maintenance: scheduled overhaul more
stringent (Dry Dock issues) & expensive
Rendez-vous du Monde Maritime – 11 mars 2015
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Propulsions Disponibles
Utilisant le Gaz Naturel Comme Carburant
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Dual-fuel engine
operating principle
Gas mode:
•Ex.
 Otto principle
 Low-pressure gas
admission 4 to 6 barg
•In. •Ex.
•In. •Ex.
•*
•*•*
•*
•*
•*•*
•*•*
•*•*•*
•*
•* •*
•In.
•*•*
•*•*
•*
•*•*
•*
 Pilot diesel injection
 Power 2,5 MW to 17,5
MW
Ex.
In. Ex.
Intake of
air and gas
In. Ex.
Compression of
air and gas
In.
Ignition by
pilot diesel fuel
Diesel mode:
 Diesel principle
 Diesel injection
Intake of
air
Compression of
air
Injection of
diesel fuel
© Wärtsilä
Rendez-vous du Monde Maritime – 11 mars 2015
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Dual-fuel engine
operating principle
The Diesel dual fuel engines are four stroke engines with either gas (BOG) or
diesel as main fuel. The operating principle in gas mode is the lean-burn concept
(Otto cycle). A lean-mixture of gas and air is provided to the combustion chamber
of each cylinder by individually controlled gas admission valve. The mixture is
ignited by a small amount of pilot Diesel fuel.
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Low Speed Diesel Engines
•
The dual-fuel (low-speed) diesel mechanical propulsion is a dual or triple-fuel
type like the DFDE capable of burning both the BOG and liquid oil
simultaneously.
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Low Speed Diesel Engines
Diesel / Otto cycle
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Low Speed Diesel Engines
Benefits
• Consumption: about 20% less than for TFDE
• Robustness (not sensitive to knocking )
• Efficiency
• Lower maintenance compare to 4 strokes (maintenance done on board by crew )
• conditioning based maintenance: Improve flexibility regarding Dry dock issues
• High fuel flexibility
Disadvantages
• Safety: Gas Fuel Pressure supply around 300 Bars for MEGI
• Compare to DFDE, MEGI & XDF cannot be operated in Gas Mode at low load
• No redundancy in gas chain equipment (In case of failure or maintenance, BOG
handling issues)
• MEGI & XDF are not proven technology in marine industry
• MEGI & XDF engines are not complying with Marpol requirements
• Defeat devices will be required
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Gas Turbine
Avantages :
•
•
•
•
Poids inférieur (15 t. pour le module LM2500 )
Montée en puissance très rapide
Facilité d'entretien ( échanges standard d'éléments )
Pollution limitée
Inconvénients :
•
•
•
•
•
Consommation spécifique plus élevée que les
moteurs diesel (235 g/kWh à 25 °C )
Sensible à la température ambiante ( LM 2500 :
23000 kW à 25 °C et 21000 kW à 35 °C )
Volumes importants des conduites d'arrivée d'air et
d'échappement des gaz
chute importante du rendement à charge partielle
en particulier pour les machines à simple arbre
Redondance?
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GAZOCEAN, one of the oldest companies specialised in maritime
transportation of liquefied gases and, is a pioneer in the development of LNG
carriers technologies as cargo containment or propulsion systems.
 Founded in 1957 by R. Boudet, in 2013, GDF SUEZ LNG (80%) and NYK
Line (20%) are the shareholders.
 GAZOCEAN is providing Crew ,Technical and Commercial Management
services for LNG and LPG carriers, Consulting services and Training for the
Gas Industry.
 GAZOCEAN is certified ISO 9001-2008, ISO 14001, ISM, ISPS and integrate
requirements of NYK NAV 9000 and OCIMF TMSA in his Quality System.
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Pioneer in Maritime
Transportation
of Liquefied Gases
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