working principle of diesel engine.pptx

8/10/2019 Working principle of diesel engine.pptx

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Muhammad Umar Chauhdhary

Presented By:


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The purpose of this presentation is to

explain the EDG Design, operations and

other basic details to improve the skills of

the operating team.


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Design Data

Working Principle

Operation of EDG

Start up and Shut Down

Emergency trip settings


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ENGINE POWER 2.8MW

RATED RPM 750

FUEL CONSUMPTION 240 L/MW-hr

ENGINE EFFICIENCY 42.4%

GENERATOR EFFICIENY 94%

COMPRESSION RATIO 13:1

NO. OF CYLINDERS 12 FREQUENCY 50 Hz

VOLTAGE 11 KV


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JACKETED WATER OUTLET 90 C

AFTER COOLER WATER 56 C

AIR FLOW (@ 25C, 96 kPa) 15558 m3/hr

AIR MASS FLOW 17354 kg/hr

COMP OUTLET PRESSURE 202.5 kPa

COMP OUTLET TEMP. 174.3 C

INLET PRESSURE 200.1 kPa

INLET TEMPERATURE 61.8 C

EX. STACK TEMPERATURE 402.2 C

EX. GAS MASS FLOW 17931 kg/hr


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Diesel engine works on diesel cycle

also known as constant pressurecycle. A diesel engine uses high

compression into a very small space

inside each cylinder causing extreme

heat, this is called 'Heat OfCompression' which ignites a very fine

high pressure mist of diesel fuel that is

injected into the cylinder at the exact

time.


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The induction stroke in a Diesel engine isused to draw in a new volume of charge airinto the cylinder. As the power generated

in an engine is dependent on the quantityof fuel burnt during combustion and that inturn is determined by the volume of air(oxygen) present, most diesel engines useturbochargers to force air into the cylinderduring the induction stroke.


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The compression stroke begins as the inletvalve closes and the piston is driven upwardsin the cylinder bore by the momentum of the

crankshaft and flywheel.

The purpose of the compression stroke in aDiesel engine is to raise the temperature of

the charge air to the point where fuel injectedinto the cylinder spontaneously ignites


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The power stroke begins as the injected

fuel spontaneously ignites with the air in

the cylinder. As the rapidly burning mixture

attempts to expand within the cylinder

walls, it generates a high pressure which

forces the piston down the cylinder bore.

The linear motion of the piston isconverted into rotary motion through the

crankshaft.


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The exhaust stroke is as critical to the smoothand efficient operation of the engine as that ofinduction. As the name suggests, it's thestroke during which the gases formed duringcombustion are ejected from the cylinder.

This needs to be a complete process aspossible, as any remaining gases displace anequivalent volume of the new charge air and

leads to a reduction in the maximum possiblepower.


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Revolutions 1500 rpm

Volumetric flow 31m/h

Operating pressure 30 bar

Power consumption 7.5kW

No. of cylinders 1

No. of stages 2 Cooling Air

Heat dissipation 7.5kW

Technical data


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Construction air receiver:

Nominal capacity 1000 liter

Working pressure 30 bar

Design pressure 33 bar

Test pressure 50 bar

Design temperature 0/+50 C

Diameter 650 mm Length over flanges approx. 3560 mm

Weight without valve head approx. 780 kg


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http://upload.wikimedia.org/wikipedia/commons/4/41/Nockenwelle_ani.gif


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Manually from Allen bredlay PLC

Manually from Enercon PLC

From DCS


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EDG

Areva

K42

K39

STG

K38

GTG

B

K28

GTG

A

K06

Emergency bus barBus bar A Bus bar B


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EDG

Areva

K42

K39

STG

K38

GTG

B

K28

GTG

A

K06

Bus bar A Bus bar B Emergency bus bar


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EDG

Areva

K42

K39

STG

K38

GTG

B

K28

GTG

A

K06

Bus bar A Bus bar B Emergency bus bar


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working principle of diesel engine.pptx

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