wartsila engine

WÄRTSI WÄRTSILÄ LÄ ENGINE ENGINE PRODUC PRODUCTS TS

1 © Wärtsilä 17 March 2010 Engine products / W LSA

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. pu mp.


2-STROKE ENGINES

3 © Wärtsilä 17 March 2010 Engine products / WLSA

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 electronicallycontrolled 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 Wärtsilä Switzerland.


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 NOX reduction.

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 NOX reduction, 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 NOX reduction, variable inlet valve closure.


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 injection system Mechanical/hydraulic control of injection

Fuel pressure produced each time by the injection pump


Common rail injection Electronic/hydraulic control of injection

Wärtsilä Common Rail design

1) Injector

2) Accumulator

3) HP-pump 4) Shielded HP-pipes 5) Drive cam


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


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 Gas mode:

Ex.

Low-pressure gas admission



Pilot diesel injection







In. Ex.

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

Otto principle



In. Ex.

In.

*** **** *

Intake of air and gas

Compression of air and gas

Ignition by pilot diesel fuel

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.


Dual Fuel Engines – Operating principle

Ex.

In. Ex.

In. Ex.

In.

Diesel mode: 

Diesel principle



Diesel injection



Back-up fuel system Intake of air

Compression of air

Injection of diesel fuel

• 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.


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 leanburn 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


29 © Wärtsilä 17 March 2010 04 Engine products / WLSA

wartsila engine

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