Man B&W 12K98ME-C7主机操作系统说明书

9 - PMI & EDS (January 2010)

MAN Diesel PrimeServ Academy PMI& CoCoS-EDS Applications

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ME Engine - PMI (January 2010)

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2010/01/01

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9 - PMI & EDS (January 2010)

PMI system– purpose

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The purpose is to follow alterations in: the combustion conditions, the general cylinder condition, the general engine condition in order to discover any operational disturbances.

ME Engine - PMI (January 2010)

© MAN Diesel

2010/01/01

9 - PMI & EDS (January 2010)

ME PMIObservations:

Engines poorly balanced, often outside recommended deviation limits Engines operated with low Pmax level

Result:

Increased fuel oil consumption& CO2 emissions

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1 bar increase in average Pmax=> 0.20 - 0.30 g/kWh decrease in fuel oil consumption

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Adjust engine continuously to best operating conditions

ME Engine - PMI (January 2010)

© MAN Diesel

2010/01/01

9 - PMI & EDS (January 2010)

PMI system– ensures

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To ensures Emissions according Technical File with: specified components>specified Performance<

ME Engine - PMI (January 2010)

© MAN Diesel

2010/01/01

9 - PMI & EDS (January 2010)

PMI system– design

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ME Engine - PMI (January 2010)

© MAN Diesel

2010/01/01

9 - PMI & EDS (January 2010)

PMI offlinePressure transducer

PMI controller

Engine control room

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d a cIntermediate Or frequency divider box

o C y emPower supply LED indicator

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Crankshaft pickup mounted at free end of crankshaft Two-stroke diesel engine ME Engine - PMI (January 2010)© MAN Diesel 2010/01/01<6>

9 - PMI & EDS (January 2010)

PMI– Cylinder Pressure Analyser

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ME Engine - PMI (January 2010)

© MAN Diesel

2010/01/01

9 - PMI & EDS (January 2010)

PMI

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ME Engine - PMI (January 2010)

© MAN Diesel

2010/01/01

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9 - PMI & EDS (January 2010)

PT diagram

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ME Engine - PMI (January 2010)

© MAN Diesel

2010/01/01

9 - PMI & EDS (January 2010)

PT diagram - zoomed

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ME Engine - PMI (January 2010)

© MAN Diesel

2010/01/01

9 - PMI & EDS (January 2010)

PV diagram

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ME Engine - PMI (January 2010)

© MAN Diesel

2010/01/01

9 - PMI & EDS (January 2010)

Balanced plot, Pmax - Pcomp

1,1bar

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P,comp tuning is done by entering a Compression Ratio Offset:

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C,Ratio=P,Comp/ P,Scav.C,Ratio Offset= -1,1/ 3,62= -0,3 (Reading from P.scav sensor is corrected to Absolute value by adding athmospheric pressure, 1 bar)

P,Max. Tuning is done by entering an offset directely in bar© MAN Diesel 2010/01/01

ME Engine - PMI (January 2010)

9 - PMI & EDS (January 2010)

Balanced plot, Pi

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-0,27 bar

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P(i) tuning: Offset (High)Load (+0,27/19,1)x100%=1,4%

ME Engine - PMI (January 2010)

© MAN Diesel

2010/01/01

9 - PMI & EDS (January 2010)

Calculated va

lues

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High Load(MCR 6S70ME-C7: 18.660 kW)

ME Engine - PMI (January 2010)

© MAN Diesel

2010/01/01

9 - PMI & EDS (January 2010)

Fuel index adjustment

Index offset (P,i) at High Load in Percentage.

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Index offset (P,i) at Low Load in Percentage. A demand for additional balancing when running low load is supplied here.

ME Engine - PMI (January 2010)

© MAN Diesel

2010/01/01

9 - PMI & EDS (January 2010)

Adjustment of maximum pressureTiming of fuel injection (corresponding to VIT adjustment on the MC engine).

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Tuning of P,comp is made by adding an offset to the Compression Ratio here

ME Engine - PMI (January 2010)

© MAN Diesel

2010/01/01

9 - PMI & EDS (January 2010)

The PMI Online System

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ME Engine - PMI (January 2010)

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2010/01/01

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PMI online– Auto tuningReduction in Fuel oil consumption/ CO2 emission

1 bar increase in average Pmax=> 0.20 - 0.25 g/kWh decrease in fuel oil consumption

Limit Pmax Potential

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Pure Pmax level increase Potential 5-10 bar At full as well as part loads

Balancing& Pmax level increase Potential additional 2-5 bar Gain even with engines already being operated within recommended limits

ME Engine - (LDE4/TOM) PMI (January 2010)

© MAN Diesel

2010/01/01

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9 - PMI & EDS (January 2010)

Engine tuning processPMI OnlineApply Pmax

Continuous auto tuning

Apply PcompYes

Semi - auto tuningObsrv. Key values Adjustmen needed?

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Extract key values

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Apply MIP

Tuned Engine

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Identify Pmax adjust

Identify Pcomp adjust

Identify MIP adjust

Retrieve pressures

Adjust Pmax

Adjust Pcomp

Adjust MIP

Manual offset adjustment

PMI OfflineME Engine - PMI (January 2010)© MAN Diesel 2010/01/01< 20>

9 - PMI & EDS (January 2010)

PMI online 2nd generationPMI/CoCoSEDS PC

Engine Control Room

Engine RoomJunction boxMAN Diesel

Portable measuring unit

Junction Box

PMI DAU Data Aqusition Unit

MOP B

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*Optional

Up to 14 cylinders Fixed Pressure Sensor

ME Engine - PMI (January 2010)

© MAN Diesel

2010/01/01

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9 - PMI & EDS (January 2010)

ME PMI Auto-tuningTCP/IP MOP-B PMI/ CoCoS-EDS PC

ArcnetMPC

Modbus

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Remote I/O with I/P converters

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TCP/IP

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DAU

Pmax adjustment signals

MC Engine

Pmax Feedback signals Cylinder pressureME Engine - PMI (January 2010)© MAN Diesel 2010/01/01

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