This is my presentation for my summer training

1. A PRESENTATION
OF
VOCATIONAL TRAINING ON
COMBINED CYCLE POWER PLANT
PRESENTED BY:-
ARIJIT ROY
VIVEKANANDA GLOBAL UNIVERSITY
DIPLOMA 5TH SEM, ELECTRICAL DEPTT.
ROLL NO:- 14TEC1EE300

2. CONTENTS
• INTRODUCTION
• OVERVIEW OF PLANT
• FLOW DIAGRAM OF CCP
• BRAYTON CYCLE
• RANKINE CYCLE
• BASIC CONCEPTS OF ENERGY CONVERSTION
• CONVENTIONAL POWER STATION
• WAYS TO INCREASE BRAYTON CYCLE EFFICIENCY
• WAYS TO INCREASE RANKINE CYCLE EFFICIENCY
• CONFIGURATION CCGT POWER PLANT
• COMPONENT USED IN POWER PLANT
• CONFIGURATION OF STEAM TURBINE
• DM WATER PLANT

3. INTRODUCTION
 One of the largest Country-based Gas & Steam exploration and
production company
 Produces around 72% of North Eastern state's Electricity.
 The OTPC CCGT Power plant is 726.6 MW power plant having 2 units
(2×363.3)= 2(232.39+130.91)
(GAS+STEAM)

4. OTPC TRIPURA ASSET, PALATANA, TRIPURA
 Tripura is one of the main work centers of ONGC in North-
eastern region.
 On the based of ONGC newly planted OTPC is now larger
production of Electricity of 726.6 MW
 It is based at PALATANA, UDAIPUR with man power of little
more than 600.

5. COMBINE CYCLE
POWER PLANT

6. OVERVIEW: THERMAL POWER PLANT

7. COMBINE CYCLE POWER PLANT (CCPP)
Natural Gas - More versatile than coal & oil
- Can be used in 90% of energy applications
Electricity

8. COMBINED CYCLE GAS TURBINE:
• THE COMBINED CYCLE CONSISTS OF THE FOLLOWING TWO
CYCLES:
 BRAYTON CYCLE
 RANKINE CYCLE

9. BASIC CONCEPTS
• CHEMICAL ENERGY STORED IN FOSSIL FUELS SUCH AS COAL,
FUEL OIL OR NATURAL GAS IS CONVERTED SUCCESSIVELY INTO
THERMAL ENERGY
MECHANICAL ENERGY
ELECTRICAL ENERGY
• THE SIMPLE WORD EQUATION FOR THIS CHEMICAL REACTION
IS:
 FUEL + OXYGEN = HEAT + CARBON DI OXIDE + WATER

10. CONVENTIONAL POWER STATION

11. GAS
TURBINE COMPRESSOR
CC 1
GAS
GAS
AIR FROM
ATMOSPHERE
DRIVE
CC 2
BYPASS
STACK 2
BYPASS
STACK 1
HRSG 1
PUMP
STEAM
TURBINE
HRSG 2
CONDENSERCOOLING
WATER
GT
GEN
ST
GEN
SCHEME OF TYPICAL POWER PLANT - COMBINED CYCLE

12. BRAYTON CYCLE
• THE IDEAL BRAYTON CYCLE CONSISTS OF FOUR INTERNAL
REVERSIBLE PROCESS:
1-2: ISENTROPIC COMPRESSION ( IN COMPRESSOR)
2-3: CONSTANT PRESSURE HEAT ADDITION
3-4: ISENTROPIC EXPANSION ( IN TURBINE)
4-1: CONSTANT PRESSURE HEAT REJECTION

13. TO INCREASE THE BRAYTON CYCLE
EFFICIENCY
• THE BRAYTON CYCLE WITH REGENERATION OR
RECUPERATOR.
• INTERCOOLING.
• RE-HEATING
• INTERCOOLING, RE-HEATING & REGENERATION

14. RANKINE CYCLE
• IDEAL CYCLE FOR VAPOUR PLANTS WITH NO
IRREVERSIBILITIES & CONSISTS OF THE FOUR PROCESS:
1-2: ISENTROPIC COMPRESSION IN PUMP.
2-3: CONSTANT PRESSURE HEAT ADDITION IN BOILER.
3-4: ISENTROPIC EXPANSION IN TURBINE.
4-1: CONSTANT PRESSURE HEAT REJECTION IN
CONDENSER.

15. TO INCREASE THE RANKINE CYCLE
EFFICIENCY
• LOWERING THE CONDENSER PRESSURE.
• SUPER-HEATING THE STEAM TO HIGH TEMPERATURE.
• INCREASING THE BOILER PRESSURE.

16. CONFIGURATION OF CCGT PLANT
 THE COMBINED-CYCLE SYSTEM INCLUDES SINGLE-SHAFT &
MULTI-SHAFT CONFIGURATIONS.
 THE SINGLE SHAFT SYSTEM CONSIST OF ONE GAS TURBINE , ONE STEAM
TURBINE, ONE GENERATOR & ONE HEAT RECOVERY STEAM GENERATOR
(HRSG).
KEY ADVANTAGES OF SINGLE-SHAFT ARRANGEMENTS:
OPERATING SIMPLICITY, SMALLER FOOTPRINT, LOWER START-UP COST.
MULTI –SHAFT SYSTEM HAVE ONE OR MORE GAS TURBINE-GENERATORS &
HRSG’S THAT SUPPLY STEAM THROUGH A COMMON HEADER TO A SEPARATE
SINGLE STEAM TURBINE- GENETRATOR.
IN TERMS OF OVERALL INVESTMENT A MULTI-SHAFT SYSTEM IS ABOUT 5%
HIGHER IN COST.

17. COMPONENTS USED IN POWER PLANT (GAS
TURBINE)
• SCRUBBERS: FUEL PASSES THROUGH SCRUBBERS THROUGH 10 INCH
HEADER TO REMOVE & TO CONTROL MAJOR DUST & DIRTY PARTICLES ALONG
WITH LIQUID GASES.
• FLAME ARRESTER: IT IS USED TO AVOID ANY KINGD OF ACCIDENTAL FIRE &
ANY ENVIRONMENTAL HAZARD CAUSES DUE TO GAS.
• GAS BOOSTING COMPRESSOR: INITIAL GAS IS PASSES THROUGH GBC FOR
COMPRESSION TO THE REQUIRED INCREASE IN PRESSURE AND
TEMPERATURE.
• COOLING TOWER: WATER IS USED A COOLING MEDIUM AT VARIOUS STAGES IN
GAS BOOSTING CHAMBER SUCH AS LUBRICATION UNIT & BYPASS CHAMBER.
THERE WERE 3 COOLING TOWERS FOR THE PURPOSE WITH 4 FANS.

18. CONFIGURATION FOR STEAM TURBINE
• THE TURBINE IS A SINGLE SHAFT MACHINE
WITH SEPARATE HP-IP (COMBINED) AND LP
PARTS.
• THE INDIVIDUAL TURBINE ROTORS AND
GENERATOR ROTOR ARE CONNECTED BY
RIGID COUPLING.
• THE HP-IP CYLINDER HAS A THROTTLE
CONTROL GOVERNING.

19. D.M. WATER PLANT
• D.M STANDS FOR DE-MINERALIZATION OF WATER.
1. TURBIDITY OF WATER IS REMOVED.
2. REMOVES BACTERIA & OTHER MICROBES.
3. NEUTRALIZES THE BASES & CONVERTS IT INTO
CORRESPONDING ACIDS.
4. REMOVES THE ACIDIC IONS PRESENT IN THE WATER.
5. THE FINAL STAGE, BALANCED REMOVAL OF IONS
TAKES PLACE USING A MIXED BED.