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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Content for the presentation
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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February 2, 20126 Wrtsil
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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February 2, 20129 Wrtsil
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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February 2, 201210 Wrtsil
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)
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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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Content for the presentation
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