ppt on nspcl rourkela

1. Presented By :- Ankitesh
Roll No. :- 214501
Branch :- Electrical Engineering
College :- V.B.S.Purvanchal University, Jaunpur
Presentation On Summer Training
At
NSPCL (Rourkela)

2. CONTENTS
• INTRODUCTION
• LAYOUT OF THE PLANT
• SITE SELECTION OF THE PLANT
• SELECTION OF FUEL
• COAL HANDLING PLANT
• DEMINERALISATION PLANT
• COMPONENTS USED IN THE PLANT
• SWITCHYARD
• CONTROL ROOM
• REFERENCES

3. INTRODUCTION
• NSPCL (NTPC-SAIL Power Company Limited) is a joint venture .
• NTPC and SAIL joined in March 2001.
• CPP (consisting of 2*60 MW generators each) located at the Rourkela Steel Plant
and Durgapur Steel Plant.
• Bhilai 2*250MW generators.
• Rourkela Captive Power Plant
(i) NSPCL Rourkela is located in the premises of Rourkela Steel Plant.
(ii)The power plant is one of the coal based power plant of Rourkela.

4. Fig. 1 Rourkela Captive Power Plant

5. LAYOUT OF THE PLANT
Fig.2 Schematic arrangement of Steam power plant

6. SITE SELECTION OF THE PLANT
• Transmission of energy.
• Cost of real estate and taxes.
• Transportation of fuel.
• Availability of water.
• Disposal of ash.
• Reliability of supply.
• Pollution and Noise.

7. SELECTION OF FUEL
• Selection of coal for power plants.
• Calorific value.
• Weather ability.
• Sulphur content.
• Grindability Index.
• Ash content.
• Particle size.

8. COAL HANDLING PLAN
Fig. 3 Layout of Coal handling plant

9. Contd.
• COAL HOPPER.
• CRUSHER.
• COAL MILLS.
• Types of Pulverizers
(i) Ball and Tube Mill
(ii) Ring and Ball
• COAL FEEDER.
• CONVEYOR BELT. Fig.4 Conveyor belt

10. Fig.5 Coal handling plant control panel Fig.6 Crushed coal

11. Fig 7 CHP

12. DEMINERALISATION PLANT
• Activated Carbon Filter:
• Cationic Exchanger:- (Ca++ and Mg++ ion)
• Anionic Exchanger:- (resin here is OH)
• Mixed Bed Type.
Fig 8. Anion Exchanger

13. Fig.9 Cation exchanger Fig.10 Activated carbon filter

14. Boiler
• Boiler is an enclosed vessel in which water is heated
• Pulverized coal is put in boiler furnace.
• Circulated until the water is turned in to steam at the required pressure.
• Coal is burned inside the combustion chamber of boiler.
• This steam at high pressure and temperature is used directly

15. Water tube boilers
• In these boilers water is inside the tubes and hot gases are
outside the tubes.
• They consists of drums and tubes.
• Feed water enters the boiler to one drum .
• Greater efficiency.
• Large heating surfaces can be obtained by use of large
number of tubes.
• pressure as high as 125 kg/sq cm and temperatures from
315 to 575 centigrade.
Fig. 8.2 Water tube boilers

16. Inner diameter 1600mm
Thickness 100mm
Outside diameter 1800mm
Overall length 11500mm
Steam Capacity 12.6 cu.m
Number of boiler drums 02
Boiler drum height from the ground 52m
Orientation of water tubes Vertical
Table no.1: Boiler Drum Specifications

17. Air preheater
• The remaining heat of flue gases is utilised by air preheater.
• It is a device used in steam boilers to transfer heat
from the flue gases to the combustion air before
the air enters the furnace.
• kept at a place near by where the air enters in to
the boiler.
• As a consequence, the gases are also sent to the
chimney or stack at a lower temperature.
Fig.11 Air preheater

18. Economiser
• Recover some of the heat from the heat carried
away in the flue gases up the chimney and utilize
for heating the feed
• placed in the passage of flue gases in between the
exit from the boiler and the entry to the chimney.
• The use of economiser results in saving in coal
consumption,increase in steaming rate and high
boiler efficiency.
• needs extra investment and increase in maintenance
costs and floor area required . Fig.12 Economiser

19. Superheater
• A component of a steam-generating unit in which
steam,after it has left the boiler drum, is heated
above its saturation temperature.
• The amount of superheat added to the steam is
influenced by rating of the boiler.
• consist of one or more stages of tube arranged to
effectively transfer heat from the products of
combustion.
Fig.13 Superheater

20. Electrostatic precipitator
• It is a device which removes dust or other
finely divided particles from flue gases by
charging the particles inductively with an
electric field
• then attracting them to highly charged
collector plates
• 2 steps process
• Corona discharge area where ionization of the
gas occurs.
• The charged particles drift toward an
electrode of opposite sign and are deposited &
neutralize.
Fig.14 ESP

21. I D Fan & F D Fan
• IDF
(i) Placed at the outlet of boiler
(ii) Exhausts all gaseous combustion products or flue gas by
creating negative pressure
(iii)More susceptible to erosion and corrosion
• FDF
(i)Supply the air for combustion pushing the air through
combustion chamber to the furnace
(ii)Most efficient fans in power plants
(iii)These are centrifugal fans, uses variable pitch axial fans

22. Condenser
• Condenser refers here to the shell and tube heat exchanger, phase transition.
• water is in short supply an air-cooled condenser is often used.
• The purpose is to condense the also to get the condensed steam in the form of
pure water, otherwise known as condensate, back to steam generator or (boiler)
as boiler feed water.
• Condensers are classified as
(i) Jet condensers or contact condensers
(ii) Surface condensers.
• In jet condensers the steam to be condensed mixes with the cooling water and the
temperature of the condensate
• In surface condensers there is no direct contact between the steam to be
condensed and the circulating cooling water.

23. Cooling tower
• This hot water is passed to cooling towers.
• It is a tower- or building-like device in which atmospheric air (the heat
receiver) circulates with warmer water
• A cooling tower may serve as the heat sink in a conventional
thermodynamic process, such as refrigeration process .
• Two basic types of cooling towers are commonly used.
• One transfers the heat of warm water to cool air by evaporation.
• No evaporative cooling towers are classified as air-cooled condensers and
as air-cooled heat exchangers,

24. Fig.17 Cooling towerFig.15 Cooling tower fans Fig.16 Sectional view of cooling tower

25. Impulse Turbine
Fig.18 Types of turbines
Have fixed nozzle that orients the flow into
high speed jets
High kinetic energy, results in shaft rotation
Drop in the pressure from inlet to outlet
increases the expansion rate of steam
Steam velocity increases
There is a loss of energy due to high exit
velocity which is called as carry over velocity

26. Alternator
Parameter Rating
Rated Power 81250 KVA
RPM 3000
Insulation Class F
Stator voltage 11500 V
Rotor voltage 186.6 V
Stator current 4879.1 A
Rotor current 1550 A
Power factor 0.8
Phase connection Y
Frequency 50 Hz
Cooling hydrogen Temp. 42. oC
Fig.19 An Alternator

27. ASH HANDLING PLANT
• fly ash about 80%
• 20% bottom ash
• Removal of Bottom-Ash: by spraying water and continuously.
• Removal of fly-Ash: Fly ash collected in each of the E.S.P hopper,
economizer hopper, air pre heater hopper and stack hopper.
• Disposal of Ash Slurry: 3 ash slurry pumps

28. Fig.20 Ash Handling Plant

29. SWITCH YARD
SWITCHYARD EQUIPMENTS:
• Isolators
• Current transformer
• CVT
• Lightening arrestor
• Earthing switch
• Wave traps
• Power transformers
• Bus reactor
• Circuit Breaker
• Relays Fig.21 Switchyard

30. Isolator
 Operates under No Load Condition
 Interlocked with Breakers and Earth Switches
 Local as well as Remote Operation possible
 Isolates Sections for Maintenance
 Used to select Bus Bars
Fig.22 Isolator

31. CT
• To step-down the high magnitude of current to a safe value to
incorporate protection .
• Current Transformers are used for the instrumentation of power
systems.
Fig. 23 Current Transformer

32. Capacitor Voltage Transformer (CVT)
• CVT is used for supplying voltage signal to the measuring instruments
and protective relays.
• This is also used as coupling capacitor for PLCC.
• Primary voltage is applied to a series of capacitors group. The voltage across
one of the capacitor is taken to Aux PT. The secondary of the Aux PT is taken
for measurement and protection.
Fig. 24 CVT

33. Lighting Arrestor
• To discharge the high voltage surges in the power system due to
Lightning to the ground.
• Not in circuit in normal operation.
• Offers low resistance at abnormal voltages
• Fail to provide protection against travelling.
• It consists of a spark gap in series
with a nonlinear resistor
Fig. 25 Surge Arrester

34. Circuit Breaker
• Parts of a Circuit Breaker:-
• Fixed Contact
• Movable Contact
• Operating Mechanism and control circuit
• Arc quenching medium
• Types of circuit breakers
• Oil CB
• Air Blast CB
• Vacuum CB
• SF6 CB
Fig.26 Circuit Breaker

35. Bus bar
• Bus bars are copper or aluminium bars (generally of rectangular X
section) and operate at constant voltage.
• The most commonly used bus bar arrangements in substations are:
(i) Single bus bar arrangement.
(ii) Single bus bar system with sectionalisation.
(iii) Double bus bar arrangement.
Fig.27 Bus Bars

36. Transformers
Fig.28 Generator transformer Fig. 29 Station transformer

37. Control Room
Fig 30. Control Room

38. REFERENCES
• 1.Materials provided at NSPCL Rourkela, Odisha, India.
• 2.http://powerelectrical.blogspot.com/2007/03/thermal-power-plant-layout-
and.html.
• 3. indianpowersector.gov.in/home/power-station/thermal-power-plant/.
• 4.http://powerplantstechnology.blogspot.in/2010/04/steam-turbine-use-in-
power-plant.html.
• 5. Generation of electrical energy “B R Gupta” page no. 5 and 83.