10 Wartsila k Portin Performance Df Engines in Lng Carriers

7/25/2019 10 Wartsila k Portin Performance Df Engines in Lng Carriers

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PERFORMANCE ANDBEHAVIOUR OF DUAL-FUEL

ENGINES IN SHIPS

KAJ PORTINWRTSIL CORPORATION

JANUARY 2012


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Content for the presentation

Wrtsil DF engines

Loading performance

Engine testing


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Wrtsil DF engines

Loading performance

Engine testing


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Wrtsil Dual-Fuel Engine Portfolio

0 5 10 15

34DF

20V34DF 9.0 MW

12V34DF 5.4 MW

9L34DF 4.0 MW

6L34DF 2.7 MW

16V34DF 7.2 MW

18V50DF 17.55 MW

16V50DF 15.6 MW

12V50DF 11.7 MW

9L50DF 8.8 MW

8L50DF 7.8 MW

6L50DF 5.85 MW50DF

20DF

9L20DF 1.6 MW

8L20DF 1.4 MW

6L20DF 1.0 MW


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February 2, 20125 Wrtsil

Wrtsil Dual Fuel engine performance

A Wrtsil dual fuel engine has the same loading ability as a diesel

engine.

Load acceptance in gas mode is restricted on low load by the turbocharging ability in principle the same way as a diesel engine. On higher

load the restriction is set by the knocking.


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Wrtsil Dual Fuel engine performance

Load acceptance comparison test in diesel mode and gas mode.

Wrtsil 50DF


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0

100

200

300

400

500

600

700

800

900

1000

0

20

40

60

80

100

120

-5 0 5 10 15 20 25 30 35

Enginespeed

Load,

TC

spee

d,

Gasfuelinjduration

Time [sec]

Engine load [%]

Gas fuel injection dur. [time]

TC speed [revs]

Engine speed [rpm]

W34DF Loading 0 100%, Gas Operation


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0

100

200

300

400

500

600

700

800

900

1000

0

20

40

60

80

100

120

-5 0 5 10 15 20 25 30 35

Eng

inespeed

Load,

TC

speed

,Gasfuelinj.d

uration

Time [sec]

Engine load [%]

Gas fuel injection dur. [time]

TC speed [revs]

Engine speed [rpm]

W34DF Loading 0 100%, Gas + Diesel Operation


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Mechanical drive operating area

W34DF CPP Application Operating Area

0

10

20

30

40

50

60

70

80

90

100

110

350 400 450 500 550 600 650 700 750 800

Engine speed [rpm]

Engin

eload[%]

MCR

CSR

Max BMEP 20.5bar

(nominal 19.8bar)

110% / 774rpm

Idling/Clutch-in speed range

60-65% of nomi nal speed

Overload area for temporary

use onl y (5% speed drop)

IMO E2-cycle points

for CPP-applic.

(4% speed droop)

Min. speed 375rpm

50% of nominal speed


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Mechanical drive


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Single main engine

Redundancy

The DF design is by its design inherently

redundant. Gas fuel redundancy: Diesel mode

Pilot fuel redundancy: Backup mode

Control system redundancy: Limp mode

(mechanical backup governor)

11


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Ramping of load, gas

Max load rate:7%/10s

Max unload rate:50%/10s


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Max instant load steps

Running at this load

Allows this big instant step


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Load ramp up

This ramp defines the max

allowed ramp rate whenloading over the whole load

range. I.e. loading from 30%

to 85% in 80s is guaranteed.

Practically same rules exist

in diesel mode (andcorresponding diesel engines

of same size).

The restriction is mainly toavoid mechanical stress due

to heating up of the big mass

of an engine.


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Load ramp down

Crash stop of LNG tanker. 85%-7% load in 7s.

Crash stop in gas mode

0

1000

2000

3000

4000

5000

6000

-20 0 20 40 60 80 100 120 140 160 180 200

Time [s]

Pressure[m

bar],

Spee

d[d

rpm

]

Was

tega

tepos

ition

[10000=o

pen

]

0

4000

8000

12000

16000

20000

24000

Loa

d[mbar],M

FIdura

tion

[us]

PT601

PT901

Pgas-PrecEngine speed [drpm]

Engine load [mbar]

MFI duration [us]


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Instant loadingLaboratory tests: Wave simulations

0,0

10,0

20,0

30,0

40,0

50,0

0,0 10,0 20,0 30,0 40,0 50,0 60,0 70,0 80,0 90,0 100,0

Loadstep/waveam

plitude[%]

Startload/lowerwaveload[%]

Wave

loading

results,

W6L50DF,

Gas

mode

6smax(Lightknock)

8smax(Lightknock)

10s

max

(Light

knock)

Performance

manual

Knock area

Load 1

Load 2

Time


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Instant load step versus ramped step

60% load

20% step

Example:

At 40% load a 20% instant step is possible. However if there are possibilities to make the load change by ramping it towards

the new load, a higher load step is achievable. These kind of tests have not been done and no exact figures can be given.

40% load

70% load

X seconds


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Wrtsil DF engines

Loading performance

Engine testing


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Engine testing

Bermeo, Spain

Vasa, Finland

Trieste, Italy


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Bermeo, Spain

Engine Automation TestingVasa, Finland

Trieste, Italy

W6L34SG

Gas engine testing

Rig Testing

Fuel Injection Mechanical SingleCylinder

Engine

W20V34SG

W6L50DF

Small engine

W6L34 DF

W16V34SG

UNIC UNIC HALT

W6L20DF

W9L20DF

W6L50SG

Rig and Automation

TestingEngine Testing


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www.wartsila.com

10 Wartsila k Portin Performance Df Engines in Lng Carriers

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