COMBNED CYCLE POWER PLANT PPT (Advanced method of Gas-Thermal based) How Combined cycle Gas-Thermal Projects in India works. Basic operation with details of modern Gas Booster Compressor (GBC) and highly efficient Heat Recovery Steam Generator(HRSG), General Electric Gas Turbines and BHEL steam turbines. [in case anyone need much detail feel free to ping me]

1. SEMINAR
ON
COMBINED CYCLE POWER
PLANTS(CCPP)
PREPARED BY:
JOYDEEP PAUL
M.TECH-P.E.D (1st
Sem)
18PEE043
N.I.T-AGARTALA
EXAMINED BY:
Miss ANINDITA JAMATIA
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2. CONTENTS:
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1. Gas turbine generation(basics).
2. Features of Gas turbine generation.
3. Need for Combined cycle operation.
4. Combined Cycle Power Plants(CCPP).
5. Main Parts of CCPP.
6. Conclusion.
7. References.

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GAS TURBINE GENERATION:
• A gas turbine, also called a combustion turbine, is a type of internal
combustion engine.
• It has an upstream rotating compressor coupled to a downstream
turbine, and a combustion chamber in between.
• The basic operation of the gas turbine is similar to that of the steam power
plant except that natural gas is used as fuel.
• Gas Turbine’s follow Brayton Cycle.

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 Open Cycle plant.
 Efficiency about 30%.
 High temp residue gases
released to atmosphere as
exhaust.
GAS TURBINE GENERATION
FEATURES:
Fig: Basic model of operation.

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NEED FOR COMBINED CYCLES:
 Utilize exhaust
waste heat.
 Improve
efficiency.
 Reduce
pollution.
Fig: Shows mechanism to utilize exhaust heat from Gas Turbines.

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COMBINED CYCLE POWER PLANTS:
 Combining
multiple cycles.
 Increased
efficiencies up to
50% or more.
 Extra steam
turbine output is
basically free of
cost.
Fig: Basic layout of Combined Cycle Plant.

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MAIN PARTS OF CCPP:
1. Fuel Storage Area- From gas supply terminal
stored fuel near plant for conditioning to
ambient condition.
2. Gas Booster Compressor- Increases pressure
and temp of gas before being sent to turbine.
3. Air Filter- Filters intake air before sent to
compressor.
Fig: Gas Booster Compressor

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MAIN PARTS OF CCPP:
4) Gas Turbine-
i.Air Compressor.
ii.Combustion Chamber.
iii.Turbine.
5) Gas Generator.
Fig: Gas Turbine.

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MAIN PARTS OF CCPP:
6) Heat Recovery Steam Generator(HRSG):
i.Economizer.
ii.Evaporator (Re-Heater).
iii.Super Heater.
iv.Boiler.
Fig: Heat Recovery Steam Generator.

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MAIN PARTS OF CCPP:
7) Steam Turbine-
Extracts thermal energy of hot
pressurized steam into rotary
motion of turbine blades.
8) Steam Generator-
Generator coupled to steam
turbine produces required steam
output.
Fig: Triple pressure Steam Turbine

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MAIN PARTS OF CCPP:
9) Condenser-
Collects exhaust steam from turbine and
condenses it.
10) Condensate Extraction Pump-
It pumps condensed water back to boiler
feed water storage.
11) Cooling Tower-
Cools condensed water collected in hotwell
of condenser. Fig: Arrangement of cooling cycle

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MAIN PARTS OF CCPP:
12) Feed Water System:
Circulates water back from feed water collector to
boiler.
i. De-aerator: Oxygen present in water is
removed here, thus preventing corrosion.
ii.Boiler Feed pump: Water from feed water
storage tank is again pumped up to boiler.
All of the above system continues till the plant runs.

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Conclusion:
Advantages:
Fuel efficiency.
Reduced emission.
Clean energy.
Fast startup
Disadvantages:
Natural gas is colorless, odorless.
Has to be located near gas reserves.
Natural gas is also a fossil-fuel.

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References:
 Power plant engineering books.
 Wikipedia.
 http://www.electrical-guru.com/Subject.aspx?id=4&code=4EE4A&
unitid=8&topicid=38.
 Training on OTPC – Palatana project site.

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