The diesel electric LNGC

Roger COURTAY

1414--17 March 200517 March 2005

GASTECH 2005

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GASTECH 2005

Diesel electric LNGC at Sea

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Diesel electric LNGC

Two Two innovations : innovations :

Diesel Electric Propulsion

CS1

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Diesel electric LNGC

Diesel Diesel Electric Electric propulsionpropulsion

withoutwithout HFOHFO

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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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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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Diesel electric LNGC

•Added safety and redundancy

•Modern technologies

•Green ship : 40% less CO2No SoxLow Nox

Already new orders

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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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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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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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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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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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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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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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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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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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Diesel electric LNGC

OxydiserOxydiser

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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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Diesel electric LNGC

SteamSteam turbine plant turbine plant

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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

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The diesel electric LNGC is now accepted

ConclusionConclusion

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