The document is a report on a combined cycle power plant located in Tripura, India. It discusses the following key points: - The plant has a total capacity of 726.6 MW across two units, each with one gas turbine and one steam turbine generating 363.3 MW. - It uses a combined cycle with both a Brayton cycle in the gas turbine and a Rankine cycle in the steam turbine to efficiently convert fuel to electricity. - The gas turbine produces steam that is used in the steam turbine, boosting overall efficiency compared to separate gas and steam plants.

1. VOCATIONAL TRAINING
REPORT ON
COMBINED CYCLE POWER
PLANT
ONGC TRIPURA POWER COMPANY

2. KURUKSHETRA INSTITUTE OF TECHNOLOGY
AND MANAGEMENT
DEPARTMENT OF MECHANICAL
ENGINEERING
SUBMITTED BY
NAME: DEBASISH DAS
ROLL: 2912471

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. ABSTARCT
 The OTPC CCGT Power plant is 726.6 MW power plant having 2
units.
 Each unit has 1 gas turbine and one 1 steam turbine.
 Rating of the gas turbine and steam turbine are 232.39 MW and
130.91 MW respectively in each unit.
 The total capacity per unit is 363.3 MW.
 Its so called Combine Cycle due to combination of Gas Turbine &
Steam Turbine.

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

10. BASIC CONCEPTS
• CHEMICAL ENERGY STORED IN FOSSIL FUELS SUCH AS
COAL, FUEL OIL OR NATURAL GAS IS CONVERTED
SUCCESSIVELY INTO
THERMAL ENERGY
MECHANICAL ENERGY AND FINALLY
ELECTRICAL ENERGY
• THE SIMPLE WORD EQUATION FOR THIS CHEMICAL
REACTION IS:

11. CONVENTIONAL POWER STATION

12. 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

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

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

16. 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.

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

19. 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.

20. 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.

21. 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.

22. TURBINE GOVERNING SYSTEM:
THE TURBINE HAS A HIGH PRESSURE
ELECTROHYDRAULIC GOVERNING SYSTEM.
 AN ELECTRIC SYSTEM MEASURES AND CONTROLS
SPEED AND OUTPUT.
THE ELECTRIC SYSTEM OPERATES THE CONTROL
VALVES IN THE ELECTROHYDRAULIC GOVERNING
SYSTEM PERMITS RUN-UP CONTROL OF TURBINE UP TO
RATED SPEED AND KEEPS SPEED SWINGS.

23. 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.