Risto Lejon, Product Management, Wärtsilä 31

Wärtsilä Marine Solutions, Business Line Engines

2017

THE MOST EFFICIENT ENGINE

IN THE WORLD

© Wärtsilä

FUEL &

OPERATIONAL

FLEXIBILITY

EMISSION

REDUCTION &

LEGISLATION

RELIABILITY

ENERGY EFFICIENCY &

TOTAL COST OF

OWNERSHIP

2

WHAT HAS BEEN THE DRIVERS FOR THIS ENGINE DEVELOPMENT

© Wärtsilä3

IT’S A V-ENGINE, IN ALL IT’S COMBINATIONS

Main parameters Diesel Dual Fuel (DF) Spark ignited Gas (SG)

Bore (mm) 310

Stroke (mm) 430

Nom. Speed (rpm) 720 / 750 720 / 750 720 / 750

Max. cyl. output (kW) 590 / 610 530 / 550 580 / 600

Cyl. configurations 8V31 10V31 12V31 14V31 16V31 20V31

Weight (tonnes) 56,7 62,0 73,0 81,0 89,0 110,5

Size L x W x H (m) 6,2 x 3,1 x 4,7 6,8 x 3,1 x 4,7 7,8 x 3,5 x 4,1 8,5 x 3,5 x 4,2 9,1 x 3,5 x 4,2 10,0 x 3,8 x 4,7

PM Gen. as installed in lab

© Wärtsilä4

DIESEL, DF & SG – SAME BORE & SAME STROKE – EXPONENTIAL BENEFITS

The Power-Pack

• “PowerPack” = cylinder head,

liner, piston, exhaust pipe and

connecting rod unit

• Cross-flow cylinder head, for

stiffness and low stress

concentration

• Same basic cylinder head for all fuels

• Semi-hydraulic valve system

• Drill cooled flame plate and

cylinder liner

• Can be assembled or

replaced as a unit

© Wärtsilä

Engine Structure & Power Systems

5

MAKE THE FOUNDATION SOLID & STRONG

• The block has been given a

stiff and durable design to

absorb internal forces

• One piece nodular cast iron

• Including water and charge

air channels and camshaft bearing housings

• Equipped with crankcase

explosion relief valve with

flame arrester

Engine block

© Wärtsilä6

ALL EXPERIENCE & COMPETENCE GATHERED IS BUILT INTO THE CORE

Crankshaft

• Constant main & big end bearing temperature

monitoring

• Power take out from both ends

Connecting rod

• 3-piece design, for minimum dismantling height

• New designed connecting rod for low weight

and increased stiffness

• Forged alloy steel, partially machined

• All studs are hydraulically tightened

Crankshaft bearings

• Tri-metal design with steel back, lead-bronze

lining and a soft running layer

• Sn-flash for corrosion protection

• Excellent loading capacity

© Wärtsilä

• Fully adjustable semi-hydraulic valve actuation

• Variable inlet valve closing enables right air-fuel ratio at any operating condition

• Variable exhaust valve closing enables lower component thermal load at any conditions

• No need to adjust valve clearance every 1000 hrs

7

IMPROVED OPERATING FLEXIBILITY, PERFORMANCE

& SERVICE-ABILITY BY ADJUSTABLE VALVE ACTUATION

Inlet valve

with variable

closing

Exhaust

valve with

variable

closing

© Wärtsilä

VARIABLE VALVE TRAIN

VEC Stepless VIC

Fast

solenoid

valve

Stepless VIC

- Fully adjustable inlet valve closing

-> Optimized performance at all loads!

VEC

- Variable scavenging

Validated in Valvetrain Rig

- 15 000 hours- Components tested in extreme conditions.

• Valve spring validation

• Additional to normal stress measurements high speed camera has been used.

8

© Wärtsilä

Jerk Pump1500 bar injection pressure;

High power density;

Twin Pump1500 bar injection pressure;

Timing adjustability;

Common Rail 11500 bar injection pressure;Timing and pressure

adjustability;

Common Rail 21800 bar injection pressure;

Timing and pressure

adjustability;Multiple injections;

Rate shaping;

Twin Pump – Twin Needle>1500 bar injection pressure;

Timing adjustability;

Small needle: low load.

Big needle:

high load.

Common Rail 2 – LFO Optimised

2200 bar injection pressure;

Timing and pressure adj.;

Multiple injection;

Fast and accurate;

Rate shaping;

Common Rail

>2000 bar injection pressure;

Timing and pressure adjustability;

Part load optimization;

Rate shaping;

Multiple injection;

Pilot in gas mode

(DF engines);

9

Pre

ssu

re, fe

atu

res

an

d p

erf

orm

an

ce

1998 2015

Jerk Pump

Twin Pump

Common Rail

CR2

TP/TN

CR2+CR & CRDF

• The new Wärtsilä 31 engine family represents the synthesis of all the previous experiences.

• The Wärtsilä 31 CR results in a unique package fitting a large spectrum of diesel and gas applications designed around the todays and future expected customer values.

W31

EXPERIENCE CREATES ULTIMATE PERFORMANCE & RELIABILITY

© Wärtsilä10

SYSTEM ARCHITECTURE

• The current trend in fuel system development

is to increase injection pressure.

• The fewer high pressure joints, the less the

possibilities for fuel leakages. Clean and safe

layout.

• A smart safety valve, the CUBE, with an

additional function enabling pressure holding

and control without automation.

© Wärtsilä11

SMOKE EMISSIONS

Smoke with different CR stages versus engine load

COMMON RAIL 1 – Already good:

• Smoke and particulate emissions of the CR1 are low.

• Practically invisible smoke is achieved over load range 25-100%.

COMMON RAIL 2 - Even better thanks to:

• Nozzle design

• Higher injection pressure capability.

0% 20% 40% 60% 80% 100%

CR2

CR1

Smok

e [F

SN]

JERK PUMP

• CR1 is better than jerk pump at low loads.• Jerk pump is better than CR1 at loads

above 60%.• CR2 brings a clear improvement in smoke

over the whole load range.

Smoke as FSN with HFO

Visibility limit

© Wärtsilä

Easy & fast installation

Easy to service

Service pack available

Coated valve plates

Ensures expected life time with LNG

Unchanged internal design

Vast experience from W32DF/W34DF

12

GAS ADMISSION VALVE ON WÄRTSILÄ 31DF

Extensive CFD simulation:

Optimum gas flow to the gas admission

valve

Balanced gas feed

Minimum losses

© Wärtsilä

• 2-stage turbocharging enabler for high efficiency

• Serviceability and uptime improved by cartridge concept for

compressor and turbine removal and overhaul

• 2nd generation two-stage turbocharging

‒ Validated on 2-stage rig and engines – June 2017

13

SIMPLICITY MULTIPLIED FOR OUTSTANDING PERFORMANCE AND RELIABILITY

Low pressure

turbochargerHigh

pressure

turbocharger

0

5000

10000

15000

20000

25000

30000

35000

40000

45000

50000

2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017

W6L20W20V32TS

W6L46TS

W31

W20V32TS

field

© Wärtsilä14

2-STAGE TURBO CHARGING SYSTEM

Fast, Accurate, Reliable; Real time valve position feedback signal standard on W31 engines.

W31 engine is equipped with 2-3 control valves depending on application.

© Wärtsilä15

SOUND AND VIBRATION INSULATION

• Proper noise insulation on engine top part to reduce engine noise emission.

• Latest noise insulation reduced 10dB noise resulting sound pressure level at 1m distance from the engine top part to be ~105dB(A).

800 Hz

100 1000

Sound inte

nsity

level,

A-w

eig

hte

d,

ref.

1

pW

/m^2

[dB

]

1/3 octave band frequency [Hz]

With cover

Without cover

10 dB

© Wärtsilä Document ID DBAE182233 Revision -.27INTERNAL16

ENGINE AUTOMATION SYSTEM FOR THE NEW AGE

[CIMAC 2016_91 / Tomi Vuollet]

© Wärtsilä

Speed / load control

Air/fuel ratio control

Valve control

Fuel & Gas injection controlThermal management

Prognostics/diagnostics

Safety

Ignition control

Knock controlEngine balancing

Start/stop management

Self tuning

Load sharing

Plant/vessel communication

High performance

engines require high

performance controls

INCREASED DATA MANAGEMENT & SYSTEM CAPABILITY IS A REALITY

Wärtsilä_4-stroke_RD_Vaasa_Plant_130215.pptx17

Redundancy (virtual sensors)Cylinder wise trip & transfer

© Wärtsilä Document ID DBAE182233 Revision -.2718

Close to 50 000 h accumulated experience gathered by 2017 end

ACCUMULATED UPFRONT EXPERIENCE FOR HIGHEST RELIABILITY DOWN STREAMS

0

10,000

20,000

30,000

40,000

50,000

2011 2012 2013 2014 2015 2016 2017

Virtual

Validation

Rig

Testing

Engine

validation

© Wärtsilä19

IN AVERAGE >9 G/KWH FUEL SAVING OVER THE WHOLE LOAD RANGE

1995 2000 2005 2010 2015B

rak

e e

ffic

ien

cy [

%]*

Year

∆ 2 %-unit

Wärtsilä 31

170

180

190

200

210

220

25 50 75 100

Market best practise

W31

g/kWh

MCR %At ambient conditions according to ISO 15550. HFO as fuel. With engine driven pumps (two cooling water + one lubricating oil pump). Acc. to ISO 3046. IMO Tier II, without SCR.

SFOC Diesel-Electric constant speed 720 rpm

© Wärtsilä Document ID DBAE182233 Revision -.27INTERNAL20

SOLD ENGINES

Type: Icebreaker

Owner: FSUE Atomflot

Yard: Vyborg

3 x W8V31

Type: Fishing vessel

Owner: P. Hepsö Rederi

Yard: Karstensen Shipyard

1 x W8V31

Type: RoPax

Owner: MolsLinien

Yard: RMC

2 x W8V31

Type: Fishing Vessel

Owner: Strand Senior AS

Yard: Karstensen Shipyard

1 x W8V31

Type: Fishing Vessel

Owner: Research Fishing

Yard: Vard

1 x W12V31

Type: Fish prosessing vessel

Owner: Hav Line

Yard: Balenciaga

1 x W10V31

Type: Fishing vessel

Owner: -

Yard: -

1 x W10V31

Type: Engine power plants

Owner: -

75MW (W20V31SG)

© Wärtsilä Document ID DBAE182233 Revision -.27

Marine engine award

21

“Over 10 years ago the seeds of development were planted

Now our customers can harvest the fruits of our work.”