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The diesel electric LNGC
Roger COURTAY
1414--17 March 200517 March 2005
GASTECH 2005
10 March 2005 2
GASTECH 2005
Diesel electric LNGC at Sea
10 March 2005 3
GASTECH 2005
Diesel electric LNGC
Two Two innovations : innovations :
Diesel Electric Propulsion
CS1
10 March 2005 4
GASTECH 2005
Diesel electric LNGC
Diesel Diesel Electric Electric propulsionpropulsion
withoutwithout HFOHFO
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GASTECH 2005
Diesel electric LNGC
HFO + LNG HFO ONLY LNG ONLY
STEAM diesel diesel HFO diesel HFO reliquéfaction Gas turb. steam
( historical ) dual fuel gas engine gas turb. steam heat recovery ( historical )
Gas feeding one low direct mechanical diesel electric
350 bar speed engine or transmission type
or electric to be M32 for GDFone medium speed engines transmission further
low speed engine or investigated
or diesel elect redondancy with variable
medium speed
speed price price engines
gear
or weight HFO HP compressor
diesel electric gas 40 bar
cargo
LNG CARRIERS
PROPULSION PLANTS ACCORDING TO FUELS USED
carburated gas engines
requires electric
transmission
power
price
without HFO
cargo
weight plant HFO
cargo
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GASTECH 2005
Diesel electric LNGC
Expected advantages Expected advantages
• + 30% thermal efficiency « fuel » savings
• Weight savings :���� no HFO���� more calories / … of « fuel »gas
• More LNG cargo loaded and delivered for a given displacement
• Time saved for refuelling
• Increased revenues
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GASTECH 2005
Diesel electric LNGC
•Added safety and redundancy
•Modern technologies
•Green ship : 40% less CO2No SoxLow Nox
Already new orders
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GASTECH 2005
Diesel-alt.
Diesel-alt.
Diesel-alt.
Diesel-alt.
MDO supply
Oxydizer
LNG tanksGas supply
EL users
Portside
engine compartment
Starboard
engine compartment
FP -
propeller
SteamVaporizer
LD-Compressor
Pumps
Stripping/fuel
Steam
Diesel Diesel Electric Electric main main principlesprinciples
El. Motor 1
El. Motor 2
Gearbox
Diesel electric LNGC
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GASTECH 2005
Diesel electric LNGC
• Develop the lean burn engines
• Tests in TRIESTE according to GDF requirements
���� Gas quality (Methan Index, N2)
���� Load variations
���� Low loads
etc...
Step Step 1 : Test 1 : Test the the D.F. D.F. enginesengines
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GASTECH 2005
Diesel electric LNGC
• Different from steam plant
• Modeling the systems
• Testing the different running operations
• Speed variations
• Electrical load variations
���� Control principles and preliminary parameters
Step Step 2 : Design 2 : Design work work -- NumericalNumerical simulationssimulations
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GASTECH 2005
Diesel electric LNGC
StepStep 3 : Dock trials 3 : Dock trials with with MDOMDO
• Engines in DO mode
• Electric transmission part load
• Oxydiser in DO part load
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GASTECH 2005
Diesel electric LNGC
• Test of DF engines and safeties
• Adjustments of controls on engines (knocking limits etc…)
• Part load combustion in oxydizer :test of safeties
StepStep 4 : Dock trials 4 : Dock trials with gas from with gas from shoreshore
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GASTECH 2005
Diesel electric LNGC
StepStep 5 :5 : SeaSea trials in DO modetrials in DO mode
• Test of the classical equipments not related to cargo
• Performances : speed, manoeuvrability, crash stop …
According to GDF stringent requirements :
���� Excellent sea keeping and manoeuvrability
���� Speed performances : O.K.
���� A very good ship
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GASTECH 2005
Diesel electric LNGC
StepStep 6 : 6 : Gas sea Gas sea trialstrials
• LD compressors with oxydiser ���� Constant flow and variable flow
• LD + oxydisers + engines���� Power variation, engine trips
• LD + engines + forcing vap���� Power variations���� Trip of engines
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GASTECH 2005
Diesel electric LNGC
Dump
Gas dome
LD
Vaporizer
heater
LD
heatercooler
cooler
Gas
dome
RP
T
T
DA1
DA2
DA3
DA4
OXYDISER
Démister
Sea water
Sea water
steam (T°180°C)
steam (T°180°C) steam (T°180°C)
Gm
Gox
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GASTECH 2005
Diesel electric LNGC
DualDual--Fuel DieselFuel Diesel--engineengine
Main technical data
Cylinder bore 500 mm
Piston stroke 580 mm
Engine speed 500/514 rpm
Mean piston speed 9.7/9.9 m/s
Mean effective pressure 20.0/19.5 bar
Cylinder output 950 kW
Cylinder configuration 6, (8, 9L)(12, 16) 18V
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GASTECH 2005
Diesel electric LNGC
OxydiserOxydiser
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GASTECH 2005
Gas dome
LD
Vaporizer
heater
LD
heatercooler
cooler
Gas
dome
RP
T
T
DA1
DA2
DA3
DA4
OXYDISER
Démister
Sea water
Sea water
steam (T°180°C)
steam (T°180°C) steam (T°180°C)
Gm
Gox
Diesel electric LNGC
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GASTECH 2005
Diesel electric LNGC
SteamSteam turbine plant turbine plant
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GASTECH 2005
Diesel electric LNGC
Main conclusionsMain conclusions
• Very different from steam plant ���� Low inertia���� Short time response needed
• Design of plant, principles correct, minor modifications
• Very promissing
10 March 2005 21
GASTECH 2005
The diesel electric LNGC is now accepted
ConclusionConclusion
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