Summer training at NTPC Dadri gas plant , full description and working.

1. “Gas Power Plant”
NTPC DADRI (U.P.)
By - Ayush Srivastava
B.Tech (EN) 4th
year

2. Topics to be covered:
• Introduction
• Gas turbine
• Generator
• Units Configuration
• Start-up And Applications of Gas Turbines
• combined cycle process
• Waste heat recovery boiler(WHRB)
• Steam turbine
• Advantages & Applications

3. • NTPC Limited is an Indian PSU Public Sector Undertaking , engaged in the business
of generation of electricity .
• The headquarters of the company is situated at New Delhi. NTPC's core business is
generation and sale of electricity to state-owned power distribution companies and
State Electricity Boards in India.
• The company also undertakes consultancy and turnkey project contracts that
involve engineering, project management, construction management and
operation and management of power plants.

4. • NTPC is the largest power generation company of India with an electric power
generating capacity of 47228 MW .
• A public sector company, it was incorporated in the year 1975 to accelerate
power development in the country as a wholly owned company of the
Government of India.
• 15 coal based (24,395 MW),
• 7 gas based (3,955 MW)

5. History
• The company was founded in November 1975 as "National
Thermal Power Corporation Private Limited".
• It started work on its first thermal power project in 1976 at
Shaktinagar (named NationalThermal Power Corporation
Private Limited Singrauli) in Uttar Pradesh.
• In the same year, its name was changed to "NationalThermal
Power Corporation Limited".
• In 1983, NTPC began commercial operations (of selling
power) and earned profits of INR 4.5 crores in FY 1982-83. By
the end of 1985, it had achieved power generation capacity of
2000 MW.

6.  NTPC Dadri plant and township are property of ntpc ltd. and were built around
1988-1990.
 NTPC Dadri is a unique power plant of NTPC group which has both coal based
thermal plant and gas based thermal plant & it also comprises solar plant as well.
 Toal capacity of coal plant is1820 MW and gas plant is 817 MW .
 Solar plant is of 5 MW
 Total power generated is 2642 MW
NTPC DADRI

7. “Coal plant”
Stage Unit Number
Installed Capacity
(MW)
Date of
Commissioning
1st 1 210 1991 October
1st 2 210 1992 December
1st 3 210 1993 March
1st 4 210 1994 March
2nd 5 490 2010 January
2nd 6 490 2010 July
Total Six 1820
• The coal for the power plant is sourced from Piparwar Mines, Jharkhand.
• Source of water for the power plant is Upper Ganga Canal.

8. “Gas plant”
Stage Unit Number
Installed
Capacity (MW)
Date of
Commissioning
GT / ST
1st
1 130.19 1992 March GT
2 130.19 1992 May GT
3 130.19 1992 June GT
4 130.19 1992 November GT
5 154.51 1993 February ST
6 154.51 1993 March ST
Total Six 829.78
 The gas for the power plant is sourced from GAIL HBJ Pipeline, it also
supports HSD as alternate fuel.
 Source of water for the power plant is Upper Ganga Canal.

9. “Solar Plant”
 Dadri solar plant started functioning from March 2013.
 It’s a 5 mega watt project .
 On an average solar power plant generates 7.26 million
units annually
 It is covering an area of 27 acres .

10. “ Gas Plant ”

11. Components of gas plant
• Compressor
• Turbine ( Steam & Gas )
• Combustion chamber
• Alternator
• Preheater
• Heat recovery boiler

12. Parts of gas turbine

13. Motion of Compressor and Turbine

14. Flow of Air

15. “Gas Turbine”
Gas Turbine is a heat engine
The Process Includes:
Compression :
• Drawing air into the engine, pressurizing it, and then feeding it to
the combustion chamber.
• Compresser consist of 16 stages , with curved blades .
Combustion :
typically made up of a ring of fuel injectors that inject a steady stream of
fuel into combustion chambers where it mixes with the air. The
combustion produces a high temperature, high pressure gas stream that
enters and expands through the turbine section.

16. Working Principle
“Brayton Cycle”
1-2: Compression
2-3: Combustion
3-4: Expansion through
Turbine and exhaust nozzle
4-1: Heat rejection to
atmosphere

17. Simplified Prototype of Steam Turbine’s Working.
COURTESY:

18. Jacking oil is provider at the shaft of the
turbine and alternator to reduce the friction .
Start-up of the GT is driven with the help of
starting equipment which runs the generator
as a motor with speed increasing from 0 to
600rpm. At this speed a pilot flame is
ignited in the combustion chamber, fuel
(gas/naphtha) enters and combustion takes
place.
Start-up of the GT

19. Start-up of the Gas Turbine
The speed increases further both with the help of generator motoring and the combustion of
fuel up to about 2000 rpm. At this speed starting equipment is switched off and only the
generator is made ready for synchronization with the grid. After synchronizations, the
turbine load increases up to base load with more and more fuel entering the combustion
chamber.

20. Working of Gas Turbine
Gas turbine basically operates in two types
 Simple cycle operation ( open cycle )
 Combined cycle operation ( closed cycle )

21. Simple Cycle Operation
A simple cycle operation turbine(SCCT) is a type of gas turbine most
frequently used in the power generation, aviation (jet engine), and oil
and gas industry (electricity generation and mechanical drives).

24. Combined Cycle Operation
The Combustion Turbine
Natural gas is mixed with air and burned in the combustion chamber to create the high
pressure gasses needed to spin a turbine. This part of the plant is a single cycle, combustion
turbine. These are sometimes called CTs. CTs are normally designed to meet peak loads.
A combined cycle power plant is a dual cycle plant. The "2nd" part of the combined cycle is a
heat recovery unit. It takes advantage of the energy in the exhaust gasses to create steam. The
steam spins a steam turbine to generate additional electricity. The combined cycle plants are
normally designed to meet base and intermediate loads.
The Combined Cycle Plant
Gas
turbine
Steam
turbine
Combined
operation

25. Heat Recovery Steam Generators

26. Waste Heat Recovery Boiler(WHRB)
Heat Recovery Steam Generators (HRSG) have found
application in a wide range of industries where the
cogeneration of steam and electricity is required, in order to
obtain an independent power plant and negligible emission
levels.

27. Heat Recovery Steam Generator

28. Control Room
SCAD system is used for
controlling as well as monitoring .
Three CPU’s were used in parallel
to send current and recorded data.

29. Switch Yard
Switch yard consist of huge size transformers and a
number of circuit-breakrs .
It is basically for switching of supply for transmission .

30. Conclusion
• Gas turbine power plants can be started up and run at
full capacity in only 10 to 20 minutes, making them well
suited as backup plants for utility companies that
require additional electricity immediately.
• Gas turbine systems also require much less water than
steam power plants, and they are easily converted into
combined cycle power plants, which are much more
efficient.

31. Applications
 Gas turbine power plants are used to supply peak loads in
steam or hydro-plants.
 They are used as standby plants for hydro-electric power
plants.
 Gas turbines are used in jet, aircraft and ships.

32. ThankYou !