The document discusses diesel (engine) power plants (DPPs). It defines a DPP as a power plant that uses a diesel engine as the prime mover for electricity generation. It then outlines the key components of a DPP, including the diesel engine, fuel supply system, cooling system, lubrication system, exhaust system, air intake system, starting system, stopping system, governing system, and generator. The document also compares two-stroke and four-stroke diesel engines and describes common components like the fuel injection system, cooling system, and engine starting and stopping mechanisms.

1. DIESEL (ENGINE) POWER
PLANT
- Vanita Thakkar
Associate Professor, Mechanical Engineering
Department, Babaria Institute of Technology,
Varanama, Vadodara

2. INTRODUCTION
DIESEL
(ENGINE)
POWER
PLANT (DPP) : A power plant
in which Diesel Engine is used
as a prime mover to for
generation of electricity.
VANITA THAKKAR
BIT, VARNAMA
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3. RECALL : DIESEL ENGINE
Constant pressure
heat addition
Constant volume
heat rejection
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4. APPLICATIONS OF DPPs
Central Station for Small and medium power outputs (upto
5-10MW capacities), e.g. in hilly or island areas (fuels like
coal, natural gas are not available and requirements like
water supply, grid, space, etc. of other types of power plants
cannot be met).
Can be used as :
Standby unit .
Nursery unit – temporary unit for setting up other power
plants.
Emergency unit – as in hospitals, malls, auditoriums,
colleges, radio stations, etc.
Mobile unit.
Peak load plant.
Captive Power Plant – for small industries.
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5. OUTLINE LAYOUT OF DPP
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6. GENERAL LAYOUT OF DPP :
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7. ESSENTIAL COMPONENTS OF DPP
9. GOVERNING SYSTEM
7. STARTING
SYSTEM
10. GENERATOR
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5. COOLING SYSTEM
8. STOPPING
SYSTEM
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8. DIESEL ENGINE
TWO STROKE ENGINE
 Rugged and compact.
 Simple design.
 Smaller flywheel.
 Develops more power for
same speed and piston
movement.
 Less capital cost.
 More favoured for DPP.
 However, high operating
cost, due to rising fuel
costs (more specific fuel
consumption).
FOUR STROKE ENGINE
 Low
specific
fuel
consumption.
 More
effective
lubrication.
 More flexibility.
 Less noisy exhaust.
 Simple
and
better
cooling.
 Better scavanging.
 Higher efficiency.
 Now
a days, more
preferred for DPP due to
high fuel costs.
Available in : 75kW to 40 MW
range.
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9. FUEL SUPPLY SYSTEM - typical
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10. COMMON RAIL FUEL SUPPLY
SYSTEM
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11. COMMON RAIL FUEL SUPPLY
SYSTEM (another representation)
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12. TYPICAL FUEL INJECTOR
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13. ENGINE COOLING SYSTEM
ENGINE COOLING
SYSTEM
WATER COOLING
(INDIRECT
COOLING)
FORCED
CIRCULATION
COOLING
OPEN SYSTEM
THERMOSTAT
COOLING
AIR COOLING
(DIRECT COOLING)
NATURAL COOLING
(THERMOSYPHON
COOLING)
CLOSED SYSTEM
PRESSURIZED
WATER COOLING
STEAM OR
EVAPORATIVE
COOLING
BY-PASS COOLING
SYSTEM
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14. ENGINE COOLING SYSTEM
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15. ENGINE LUBRICATIONEnsures frictionless
SYSTEM
operation of piston.
Carries away dirt and
particulates left out
by piston movement.
Carries away heat
from engine cylinder.
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16. ENGINE EXHAUST SYSTEM
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17. AIR INTAKE SYSTEM

Wet
type
Dry
type
To supply clean, debrisfree
and
cool
(supercharged) air with
least noise.
Wet type
• Dirt from sucked /
bubbled air sticks to
oil in oil bath.
• Then,
air
passes
through screen type
material to remove
entrapped oil particles.
• Paper, cloth or metal
screen used to catch
and trap dirt.
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18. ENGINE STARTING SYSTEM
Start signal sent to starting motor 
Air, electric, or hydraulic motor, will
engage engine’s flywheel
Starting motor will crank / spin
the engine at a high enough rpm
Engine’s compression increases to
ignite the fuel  engine starts
running.
The engine accelerates to idle
speed.
When starter motor is overdriven by
the running motor it will disengage the
flywheel.
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19. ENGINE STOPPING SYSTEM

Stopping fuel supply :
◦ Most commonly used.
◦ Fuel supply to fuel injection pump is cut by a
solenoid valve placed near the inlet of fuel
injection pumps.
◦ Solenoid valve : the valve needle has
magnetic head placed inside a solenoid (coil
Magnetic Force which
or wire).
Electric current in the coil
Fuel flow starts
moves needle.
Hand operated switch 
current stops
Needle comes back on
the supply inlet  Fuel
flow stops.
VANITA THAKKAR
ENGINE
STOPS
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20. ENGINE STOPPING SYSTEM
(CONTD.)
Other methods of stopping DE :
 Keeping
exhaust valve open.
 Shutting
of air supply.
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BIT, VARNAMA
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21. THANKS !!!
VANITA THAKKAR
ASSOCIATE PROFESSOR,
MECHANICAL ENGINEERING DEPARTMENT,
BABARIA INSTITUTE OF TECHNOLOGY,
VARNAMA, VADODARA
VANITA THAKKAR
BIT, VARNAMA
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