Philosophy of RT-flex technology and differences to ...

RT-flex Design Aspects

© Wärtsilä Land & Sea Academy Chapter 10 16-Sep-11

Philosophy and Design Aspects of RT-flex Technology and Differences to Conventional

RTA Engines

RT-flex Training

Chapter 10



History

History of

RTARTA introduced in 19822’854 RTA engines sold with 52M kW(Aug. 10)

RT-flexFirst RT-flex workshop in 1996Start of first RT-flex engine in 2001 (6RT-flex58T-B / GYPSUM CENTENNIAL)913 RT-flex engines sold with total 25M kW (Jun. 11)



RTX Generations

1st generationRTX-1

2nd generationRTX-2

3rd generationRTX-3

4th generationRTX-4

2007



Cylinder Pressures

Maximum cylinder pressure

Mean effective pressure



Power Range



Differences RTA to RT-flex engines



Differences to RTA engines



Comparison Table

RTA RT-flex

Developing fuel oil pressure One fuel pump per cylinder Fuel pumps on supply unit„Storing“ of fuel oil pressure - Fuel railTiming of injection Fuel cam on camshaft WECS-9520 / ICUDeveloping pressure for exhaust valve activation

One activating pump per cylinder

Servo pumps on supply unit

„Storing“ of servo oil pressure - Servo railTiming of exhaust valve activation

Valve cam on camshaft WECS-9520 / VCU

Governor actuator (RTA)

Fuel pump actuator (RT-flex)

Regulating fuel injection quantity / control by governor regulator

Keeping fuel rail pressure and control by WECS-9520

Electronic governor Releasing fuel injection pump position to the actuator

Releasing fuel command to WECS-9520

Fuel injection quantity control by

Governor and fuel injection pump

WECS-9520 / ICU acc. to governor’s fuel command



Comparison Table

RTA RT-flex

Timing of starting air Starting air distributor WECS-9520Reversing Reversing of cam WECS-9520Alarm and monitoring system External (internal: OSC-3) ExternalEmergency control By mechanic shaft and cams

acting on pneumatic valves of the engine control

Backup panels deliver manoeuvring signals and fuel commands to WECS inputs, independent from the RC inputs channels

Load signal RC receives load signal from angle transmitter on intermediate shaft

WECS supplies a fuel command feedback as load signal to the RC system

VIT, VEC Functions provided in RC system

Functions (plus VEO) included in WECS

Wiring from engine to external Individual cables Bus-system



Why Common-Rail

Higher efficiency than conventional engines (lower fuel consumption)

Reduced part load fuel consumption and smoke

Possibilities to reduce emissions

Lower minimum engine speed

Better manoeuvrability



Advantages of RT-flex

0.00

0.05

0.10

0.15

0.20

0.25

0.30

0.35

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0.45

0.50

0 10 20 30 40 50 60 70 80 90 100Engine Load [% ]

Filte

r Sm

oke

Num

ber [

FS

N ] HFO

380 cSt 3% sulphur 0.1% ash

Conventional low speed engine

OFF Aux. BlowerON

6RT-flex 58T-B with common rail

Smoke visibility limit

Wärtsilä 6 RT-flex58T-B MV Gypsum CentennialSmoke measurement on combinator curve during sea trials



Advantages of RT-flex



Engine Numbering and Designations

DRIVING END

Thrust Bearing Pads Main Bearing Numbering

FREE END

Cylinder Numbering

Turbocharger 1 Turbocharger 2

1 2 3 4 5 6 7



Engine Numbering and Designations

FUEL SIDE EXHAUST SIDE

Clockwise RotationCounter-clockwise Rotation

Philosophy of RT-flex technology and differences to ...

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