Feature 3 | FiNLaND’s mariNe iNDusTries
LNG power, your flexible friend
As the price of crude oil rises and new regulations impose harsher penalties
on polluters the cost of alternative fuels becomes ever more attractive.
However, the main aim for owners must be flexibility, said the Finland based
Wärtsilä.
L
iquefied Natural Gas (LNG)
is becoming an increasingly
viable alternative to diesel,
said Wärtsilä’s director of sales - ship
power Rolf Stiefel, and the company
expects to sign contracts within the
next six months that will see merchant
ships, other than gas carriers, use the
technology.
Wärtsilä believes that the years
of development that it has put into
LNG power has given the company a
competitive edge in the market for dual
fuel engines. Wärtsilä’s experience in
the field dates back to the latter part
of the twentieth century with dual fuel
engines for land based applications
before the marine versions were fitted
TECHNOLOGY
to gas carri
AND OPERA
ers built
TION
by Chantier de
W
LNG system intergration showing stoage tanks, evapourators, dual fuel main engine and
ÄRTSILÄ GENSET W20DF IMO Tier II
ADV
l’At
ANT
lant
AGES
ique, said Mr Stiefel. dual fuel auxilary engines.
Main data:
One of the main fea“We have sevtures of the proven eral hundred engines, Cylinder bore .................................. 200 mm
Dual Fuel technologaround 300, on y is thaordert the eng and wine can e have the
Piston stroke .................................. 280 mm
WÄR
Cylinder output
TSILÄ GENSET 20
...................
146/176 kW/cyl
IMO Tier II
be switched from fuel oil to gas opera
greatest experience and the
tion.
bi
ggest
Main data
SEngine speedhanghai.
.....................It joins t1 000/1 200 rpmhe m
edium range “Fuel flexibility is the innovation in
T
va
ransfer takes place automa
riety of dual fuel en
ticall
gin
y after
es to offer,”
Cylinder bor
3
Mean effi
4DF
e ..................................
,
3
ctive pr
4SG
essur
and
e
3
..................200 mm
2GD e
Fuel oil specification:
n
20.0 bar
gines or the
these engines,” explains Mr Stiefel, “the
Piston str
Piston speed
oke...................................
...........................
280 mm
9.3/11.2 m/s
730 cSt/50°C
the opera
said Mr S
tor’
t
s command without power
iefel.
Cylinder output
lGenerator voltageargest in t
..................
he s
185, 200 kW/cyl
......................eries the 50D0.4-13.8 kV
7200 sR1/100°F
F engin
e. connection to the ship [of the dual fuel
Engine speed ........................900–1000 rpm
The latest version of Wärtsilä’s dual
Generator effi
All the
ciency
dual
.....................
ISO 8217, category ISO-F-RMK 700
or tri-fu
0.95-0.96
interruption or instantly in case of a gas
Mean effective pressure ........24.6, 28.0 bar SFOC 185–194 g/kWh
el series of
engine] is similar to diesel – through a
Piston speed............................. 6.7, 9.3 m/s at ISO condition
suppl
fuel
y interruption.
series of
Furthermore,
engines, th
the separa
e 20DF
te
theGenerator voltage eFuel oil specifingines
.....................ca cation:n ope0.4–13.8 kVrate on LNG, marine gearbox and a controllable pitch propeller
Generator efficiency
smallest of the dual fuel units, was di
ISO-F-DMX, DMA and DMB
.................... 0.95–0.96
liquid fuel system makes it possible to
esel or heavy fuel oil and this gives – or they can generate electricity for
Option: Common rail fuel injection.
ISO 8217:2005(E)
first presented to the market during ship operators the flexibility to use the auxiliary power or main engine power.”
switch over from MDO to HFO without power
December’s Marintec exhibition in m
SFOC 194/199 g/kWh at ISO conditions
ost cost-effective Rated power 60 Hzfuel in the region in Multi fuel engines are not new said
interruption. The fuel switch from liquid to gas
Without engine driven pumps
which the vessel is o
60 Hz
perating.
50 Hz
Tolerance 5 %
Mr Stiefel, they have been utilised in the
operation mode can be made as described
185 kW/cyl, 900 rpm 200 kW/cyl, 1000 rpm
Engine type
Eng. kW Gen. kW Eng. kW Gen. kW
above. This operaTechnical partion fl exibility is a real Ticulars
Rated power
Technical details
4L20 740 700 800 760
6L20 1 110 1 055 1 200 1 140
advantage with the Dual Fuel system.
WÄRTSILÄ GENSET W20DF
60 Hz 50 Hz
of Wärtsilä’s latest
8L20 1 480 1 405 1 600 1 520
9L20 1 665 1 580 1 800 1 710
The natural gas is supplied to the engine
dual fuel engine
176, kW/cyl, 1 200 rpm 146 kW/cyl, 1 000 rpm
through a gas valve unit,
WÄR
Generator output based on a generator efficiency of 95%.
TSILÄ 20
Engine type
Cylinder bore ..................................200 where the gas is mm
Engine kW Alternator kW* Engine kW
IMO Tier II
the W20DF.
Alternator kW*
Main data
Dimensions (mm) and weights (tonnes)
fi ltered and gas pressure is controlled.Piston stroke ..................................280 The mm
Cylinder borEngine type
6L20DF
e ..................................A* E*
1 056
200 mm Fuel specification:I*
1 014
K L*
876
Weight*
841
Piston stroke................................... 280 mm Fuel oil .................................... 730 cSt/50 °C
system includes the necessar
Cylinder output ...................
y shut-of
146/176
f and
kW/cyl
Cylinder output
4L20 8L20DF
4 910
..........................
1 770/1 920
200 kW/cyl
1 408 990 1 3521 800 2 3381 168
7200 sR1/100 °F
14.0
1 121
Speed
6L20
...........................................
5 325 1 770/1 920/2 070
1000 rpm
895/975/1 025
ISO 8217, category ISO-F-RMK 700
1 800 2 243/2 323/2 373 16.8
venting valves to ensure safe and trouble-free
Engine speed .....................1000/1200 rpm Mean ef8L20fective pr9L20DF6 030essure .................1 920/2 0701 58428.0 bar1 025/1 075 1 5211 800 2 474/2 524SFOC 186–192 g/kWh1 314 20.7 1 261
Piston speed9L20 ....................................6 535 2 070/2 3009.3 m/s1 075/1 125 1 800 2 524/2 574at ISO condition23.8
low pressure gas suppl
Mean effective pressure
y. On the eng
..................20.0
ine, the
bar
* Assumed alternator effi ciency 96%
gas is supplied through a large common-rail
Piston speed ...........................9.3/11.2m/s
Option: Common rail fuel injection.
* Dependent on generator type and size.
For definitions see page 93.
Dimensions (mm), Weights (tonnes)
pipe running along the eng
Generator voltage ......................0.4-13.
ine. Each cylinder
8 kV
Engine type A* Rated powerE I* K L* Weight*
then has an individual feed pipe to the gas
Generator efficiency .....................0.95-0.96
Engine type
6L20DF 5 325 2 070
kW
900/980/1 030 1 800 2 688 17
Fuel oil specification:
........ISO-F-DMX, DMA
admission valve on the cylinder head. Gas 4L20
8L20DF 6 030 2 070
800
1 030/1 080
1 800 2 824 20,9
and DMB ISO 8217:2005(E)
piping is of double wall design as standard.
6L20 1 200
8L20
9L20DF 6 535 2 300
1 600
1 080/1 130
1 800 2 874 24
When running the engine in gas mode,
9L20
* Preliminary: depends on generator type
1 800
the air / gas mixture is ignited with a small 54 The Naval Architect February 2010
quantity of MDO pilot fuel, less than 1% of
Dimensions (mm) and weights (tonnes)
Engine type A* A B* B C* C D F Weight
full-load fuel consumption. The amount of pilot
4L20 – 2 510 – 1 348 – 1 483 1 800 725 7.2
fuel is optimised for best combustion by the
6L20 3 254 3 108 1 528 1 348 1 580 1 579 1 800 624 9.3
NA Feb10 - p54+
p56.indd 54 02/02/2010 14:49:43
embedded engine speed & load control and
8L20 3 973 3 783 1 614 1 465 1 756 1 713 1 800 624 11.0
9L20 4 261 4 076 1 614 1 449 1 756 1 713 1 800 624 11.6
monitoring system.
*Turbocharger at flywheel end.
The advanced automation system provides
For definitions see page 71.88
Dimensions (mm), Weights (tonnes) engine
complete engine safety system and local
Engine type A* A B F C D Weight*
monitoring. Thanks to built-on complete
6L20DF 3 254 3 108 1 698 624 1 829 1 800 9,5
automation integration the external control
8L20DF 3 973 3 783 1 815 624 1 963 1 800 11,2
system is signifi cantly reduced which obviously
9L20DF 4 261 4 076 1 799 624 1 963 1 800 11,8
saves space in the engine control room.
ENVIRONMENTAL COMPLIANCE
The Dual Fuel technology brings outstanding
benefi ts to ship owners and operators. The
Wärtsilä 20DF operates on the lean burn
principle: the mixture of air and gas in the
cylinder contains more air than is needed 62
for complete combustion. Lean combustion SOX and CO2 emissions as well as smokeless
reduces peak temperatures and therefore NOX operation in gas operation mode.
emissions. In gas mode, the engine is already In liquid fuel oil mode, the WÄRTSILÄ 20DF
compliant with IMO Tier III regulations without engine is fully compliant with the IMO Tier
any secondary exhaust gas purifi cation II exhaust emissions regulations set out in
systems. Dual Fuel technology offers reduced Annex VI of the MARPOL 73/78 convention.
ce 11.2009
s Offi
WÄRTSILÄ
®
is a registered trademark. Copyright © 2009 Wärtsilä Corporation. Bock’
WARTSILA.COM
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