wartsila engine

1 © Wärtsilä 17 March 2010 Engine products / WLSA

WÄRTSILÄ ENGINE PRODUCTS


• In general we distinguish: – 2-stroke engines– 4-stroke engines

• Engines categorised by the fuel type used for the engines:– Oil fired engines– Gas fired engines– Dual fuel engines that can handle both oil and gas.

• Engines categorised by the purpose of an engine: – to drive a propulsion – to drive a generator – to power other devices such as a pump.

Engine Products


2-STROKE ENGINES


2-stroke engines

• The current low-speed engine portfolio comprises the Wärtsilä RTA and RT-flex engine types which cover a power range from 5100 kW to 80,080 kW.

• Wärtsilä RTA-series engines: – Traditional camshaft-controlled low-speed diesel

engine• Wärtsilä RT-flex engines:

– Based on the RTA-series but have electronically-controlled common-rail systems for fuel injection and valve actuation.

• These engines are marketed world-wide for application in the propulsion of all types of deep-sea ships.

• Low-speed engines are developed, designed, marketed and serviced by Wärtsilä.

• The engines are manufactured by specialised engine manufacturing companies under licence from WärtsiläSwitzerland.


4-STROKE ENGINE PRODUCT NAMES


Engine Product Names: Configuration

e.g. Wärtsilä 18V32DF• Wärtsilä = Brand• 18V = Cylinder configuration: V-engine = V, in-line engine = L• 32 = Engine group• DF = Technology (if in use)

e.g. Wärtsilä Auxpac 975W6L20.• Auxpac engines are identified with powered output (electrical),

• Engine groups• 20, 26, 32, 34, 38, 46, 46F, 50, 64

• Technology• DF = Dual Fuel• GD = Gas Diesel• SG = Spark-ignited Gas


4-STROKE ENGINES


Wärtsilä 20

Main data• Cylinder bore ..................................200 mm• Piston stroke...................................280 mm• Cylinder output .................. 180, 200 kW/cyl• Speed ...........................................1000 rpm• Mean effective pressure ........ 24.6, 28.0 bar• Piston speed.................................... 9.3 m/s

• Options: Common rail fuel injection, humidification of combustion air for NOXreduction.

Cylinder configurations• 4L20• 6L20• 8L20• 9L20


Wärtsilä 32

Main data• Cylinder bore ..................................320 mm• Piston stroke...................................400 mm• Cylinder output .......................... 500 kW/cyl• Speed .............................................750 rpm• Mean effective pressure .................24.9 bar• Piston speed.................................. 10.0 m/s

Cylinder configurations• 6L32• 8L32• 9L32• 12V32• 16V32• 18V32• 20V32


Wärtsilä 46

Main data• Cylinder bore ..................................460 mm• Piston stroke...................................580 mm• Cylinder output ................ 975, 1050 kW/cyl• Speed .....................................500, 514 rpm• Mean effective pressure ........ 23.6–28.8 bar• Piston speed............................. 9.7, 9.9 m/s

• Options: Common rail fuel injection, humidification of combustion air for NOXreduction, crude oil.

Cylinder configurations• 6L46• 8L46• 9L46• 12V46• 16V46• 18V46


Wärtsilä 46F

Main Data• Cylinder bore ..................................460 mm• Piston stroke...................................580 mm• Cylinder output ........................ 1250 kW/cyl• Speed .............................................600 rpm• Mean effective pressure .................25.9 bar• Piston speed.................................. 11.6 m/s

• Options: Twin plunger injection pumps, humidification of combustion air for NOXreduction, variable inlet valve closure.

Cylinder configurations• 6L46F• 8L46F• 12V46F• 20V46F


COMMON RAIL SYSTEM


Common Rail System advantages

• Smokeless operation at all loads and speeds.• Smokeless start of the engine.• Improved total fuel economy.• Flexibility for different fuels without hardware modifications (heavy fuel,

diesel oil, gas turbine fuel, water-fuel emulsion).


Conventional vs. common rail injection

Conventional injectionsystem

Common rail injection

Fuel pressureproduced each time by the injection pump

Mechanical/hydrauliccontrol of injection

Electronic/hydrauliccontrol of injection


1) Injector

2) Accumulator

3) HP-pump

4) Shielded HP-pipes

5) Drive cam

Wärtsilä Common Rail design


DUAL-FUEL ENGINES


Wärtsilä 34 DF

Main data• Cylinder bore .................................340 mm• Piston stroke...................................400 mm• Cylinder output .................. 435, 450 kW/cyl• Speed .....................................720, 750 rpm• Mean effective pressure ........ 20.0, 19.8 bar• Piston speed........................... 9.6, 10.0 m/s

Cylinder configurations• 6L34DF• 9L34DF• 12V34DF• 16V34DF


Wärtsilä 50 DF

Main data• Cylinder bore ..................................500 mm• Piston stroke...................................580 mm• Cylinder output .......................... 950 kW/cyl• Speed ....................................500, 514 rpm• Mean effective pressure ........ 20.0, 19.5 bar• Piston speed............................. 9.7, 9.9 m/s

Cylinder configurations• 6L50DF• 8L50DF• 9L50DF• 12V50DF• 16V50DF• 18V50DF


Dual Fuel Engines - Operating principle

The gas is mixed with air before the intake valves. After the compression phase, the gas-air mixture is ignited by a small amount of liquid pilot fuel.

* ** ** * **

******** * ****

* *

Intake ofair and gas

Compression ofair and gas

Ignition bypilot diesel fuel

Gas mode:

Otto principle

Low-pressure gas admission

Pilot diesel injection

Ex. In. Ex. In.Ex. In.


Dual Fuel Engines – Operating principle

• This is a normal diesel process with camshaft-operated liquid fuel pumps running in parallel with the process and working as a stand-by.

• The engine can be switched automatically from fuel oil to gas operation at loads below 80 % of the full load.

Diesel mode:

Diesel principle

Diesel injection

Back-up fuel systemIntake of

airCompression of

airInjection ofdiesel fuel

Ex. In. Ex. In.Ex. In.


Wärtsilä 32 GD

Main data• Cylinder bore………………………320 mm• Piston stroke……………………….350 mm• Rated speed ………………….750/720 rpm• Mean piston speed……………8.75/8.4 m/s• BMEP………………………….21.3/24.0 bar• Cylinder output………………………375 kW

Cylinder configurations• 12V32GD • 16V32GD • 18V32GD


Gas-diesel engines – operating principle

Gas mode:• The gas is injected at high pressure after the pilot

fuel and is ignited by the flame from the pilot fuel injection.

Liquid Fuel mode:• The gas-diesel engine can be switched over

instantly to operation.• The liquid fuel can be light fuel oil, heavy fuel oil

or crude oil.• The process is the same as the conventional

diesel process.

Fuel Sharing mode:• The ratio between liquid and gas fuel amounts

can be controlled and varied during operation.• The operating window is 35 to 90% load and the

gas/liquid fuel ratio can vary from 80/20 to 15/85.

• The gas-diesel process can tolerate big variations in the gas quality and is especially suitable for “non-pipeline quality gas”, such as associated gas in oil fields.


WÄRTSILÄ GAS ENGINES


Wärtsilä 34SG

Main data• Cylinder bore………………………… 340 mm• Piston stroke…………………………. 400 mm• Speed………………………….. 720 / 750 rpm• Mean effective pressure…….. 20.0 / 19.8 bar• Piston speed……………………... 9.6 / 10 m/s

Cylinder configurations• 9L34SG• 16V34SG• 20V34SG


SG engines – operating principle

• The SG engines are spark-ignited lean-burn engines.

• The gas is mixed with air before the inlet valves.

• The gas is also fed into a small prechamber, where the gas mixture is rich compared to the gas in the cylinder.

• The gas-air mixture in the prechamber is ignited by a spark plug.

• The flames from the nozzle of the prechamber ignite the gas-air mixture in the whole cylinder.


The lean-burn concept

• In a lean-burn gas engine, the mixture of air and gas in the cylinder is lean, i.e. more air is present in the cylinder than is needed for complete combustion.

• With leaner combustion, the peak temperature is reduced and less NOX is produced.

• Higher output can be reached while avoiding knocking and the efficiency is increased as well, although a too lean mixture will cause misfiring


NON-PORTFOLIO ENGINES


Non-Portfolio Engines

• Engines that are no longer part of the official Wärtsilä product portfolio (in active production), are called non-portfolio engines.

• Bolnes• Crepelle engines • Deutz marine engines • Nohab• Stork engines • Sulzer A/S • UD 25 engines • UD 30 engines • UD 33 engines • UD 45 engines • W 200 engines • Wärtsilä 32DF • Wärtsilä 32GD • Wärtsilä 38A • Wärtsilä Vasa 32

wartsila engine

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