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1 Wrtsil 17 March 2010 Engine products / WLSA
WRTSIL ENGINE PRODUCTS
2 Wrtsil 17 March 2010 Engine products / WLSA
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
3 Wrtsil 17 March 2010 Engine products / WLSA
2-STROKE ENGINES
4 Wrtsil 17 March 2010 Engine products / WLSA
2-stroke engines
The current low-speed engine portfolio comprises the Wrtsil RTA and RT-flex engine types which cover a power range from 5100 kW to 80,080 kW.
Wrtsil RTA-series engines: Traditional camshaft-controlled low-speed diesel
engine Wrtsil 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 Wrtsil.
The engines are manufactured by specialised engine manufacturing companies under licence from WrtsilSwitzerland.
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4-STROKE ENGINE PRODUCT NAMES
6 Wrtsil 17 March 2010 Engine products / WLSA
Engine Product Names: Configuration
e.g. Wrtsil 18V32DF Wrtsil = Brand 18V = Cylinder configuration: V-engine = V, in-line engine = L 32 = Engine group DF = Technology (if in use)
e.g. Wrtsil 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
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4-STROKE ENGINES
8 Wrtsil 17 March 2010 Engine products / WLSA
Wrtsil 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
9 Wrtsil 17 March 2010 Engine products / WLSA
Wrtsil 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
10 Wrtsil 17 March 2010 Engine products / WLSA
Wrtsil 46
Main data Cylinder bore ..................................460 mm Piston stroke...................................580 mm Cylinder output ................ 975, 1050 kW/cyl Speed .....................................500, 514 rpm Mean effective pressure ........ 23.628.8 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
11 Wrtsil 17 March 2010 Engine products / WLSA
Wrtsil 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
12 Wrtsil 17 March 2010 Engine products / WLSA
COMMON RAIL SYSTEM
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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).
14 Wrtsil 17 March 2010 Engine products / WLSA
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
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1) Injector
2) Accumulator
3) HP-pump
4) Shielded HP-pipes
5) Drive cam
Wrtsil Common Rail design
16 Wrtsil 17 March 2010 Engine products / WLSA
DUAL-FUEL ENGINES
17 Wrtsil 17 March 2010 Engine products / WLSA
Wrtsil 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
18 Wrtsil 17 March 2010 Engine products / WLSA
Wrtsil 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
19 Wrtsil 17 March 2010 Engine products / WLSA
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.
20 Wrtsil 17 March 2010 Engine products / WLSA
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 system
Intake ofair
Compression ofair
Injection ofdiesel fuel
Ex. In. Ex. In.Ex. In.
21 Wrtsil 17 March 2010 Engine products / WLSA
Wrtsil 32 GD
Main data Cylinder bore320 mm Piston stroke.350 mm Rated speed .750/720 rpm Mean piston speed8.75/8.4 m/s BMEP.21.3/24.0 bar Cylinder output375 kW
Cylinder configurations 12V32GD 16V32GD 18V32GD
22 Wrtsil 17 March 2010 Engine products / WLSA
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.
23 Wrtsil 17 March 2010 Engine products / WLSA
WRTSIL GAS ENGINES
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Wrtsil 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
25 Wrtsil 17 March 2010 Engine products / WLSA
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.
26 Wrtsil 17 March 2010 Engine products / WLSA
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
27 Wrtsil 17 March 2010 Engine products / WLSA
NON-PORTFOLIO ENGINES
28 Wrtsil 17 March 2010 Engine products / WLSA
Non-Portfolio Engines
Engines that are no longer part of the official Wrtsil 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 Wrtsil 32DF Wrtsil 32GD Wrtsil 38A Wrtsil Vasa 32
29 Wrtsil 17 March 2010 04 Engine products / WLSA