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NATIONAL THERMAL POWER CORPORATION Ltd. (NTPC ltd. FARIDABAD, HARYANA) Prepared by- BHASKAR GOEL E&C HCST FARAH MATHURA
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Page 1: ntpc summer training

NATIONAL THERMAL POWER CORPORATION Ltd.

(NTPC ltd. FARIDABAD, HARYANA)

Prepared by- BHASKAR GOEL E&C HCST FARAH MATHURA

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AN OVERVIEW

NTPC was set up in 1975. India’s largest power company. NTPC is emerging as a diversified power major. NTPC has already ventured into consultancy,

power trading, ash utilisation and coal mining. NTPC became a Maharatna company in May,

2010 Total installed capacity of the company is 39,174

MW

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NTPC has 16 coal based, 7 gas based stations and is also coming up with hydro based plants at koldam in (H.P.) and Tapovan vishnugad in (uttrakhand).

In addition under JV’s 7 stations are coal based & 1 uses naphtha/LNG as fuel.

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BRIEF DESCRIPTION OF FARIDABAD GAS POWER PLANT-

It is a Gas based Combined Cycle Power Plant. Plant Capacity : 432 MW Plant Configuration : Gas Turbine 1 - 138 MW

Gas Turbine 2 - 138 MW Steam Turbine - 156 MW

Mode of Operation : Base Load Fuel : Natural Gas Alternate Fuel : Naphtha Average Gas : 2 million cubic meters per day requirement

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Fuel Source : HBJ pipe line ( through GAIL ) Naphtha Storage : 2 tanks of 8000 Kl. Capacity each Power Evacuation : >2X220 KV Double circuit lines to 220 KV BBMB

sub-station at Samaipur ( Ballabgarh )

>2X220 KV Double Circuit lines to 220 KV HVPN sub-station at Palla ( Faridabad )

Cooling water : Rampur Distributory source Gas based power plant has minimum water requirement of

1.7 – 2.00 M3/MW against any other kind of power plant.

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What does combined cycle gas turbine(CCGT) means?

A (CCGT) plant is an electrical power plant in which a gas turbine and a steam turbine are used in combination to achieve greater efficiency than would be possible independently.

The gas turbine drives an electrical generator while the gas turbine exhaust is used to produce steam in a heat exchanger(called a Heat Recovery Steam Generator, HRSG) to supply a steam turbine whose output provides the means to generate more electricity.

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EfficiencyCombined cycle efficiency eq.hCC = hB + hR - (hB * hR)

suppose the gas turbines efficiency hB is 40% and that the steam turbine efficiency hR is 30%hencehCC = 0.4 + 0.3 – (0.4 * 0.3)hCC = 0.58-> hCC = 58%

The combined cycle efficiency of 58% is much greater than either the gas turbine or the steam turbines efficiencies separately. Power output of the steam turbine is typically 1/3 of the total output of the totalpower output of the combine cycle power plant. It is this “extra” electricity produced from the same amount of turbine energy (without additional fuel consumption) that makes a combined cycle plant much more efficient than a simple cycle gas turbine peaking plant.

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FLOW DIAGRAMS DEPICTING OPEN AND CLOSED CYCLE WORKING OF CCGT

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GT#1

GT#2

220 KV

220 KV

Main Steam Line

By Pass Stack

By Pass Stack

15.75 KV

10.5 KV

10.5 KV

GEN. TR

GEN. TR

UAT6.6 KV

AIR intake

AIR intakeUAT

6.6 KV

137.758 MW

137.758 MW

STHPT

LPT

275.5 MW

WHRB#2

WHRB#1

156.07 MW

Gas / NapthaGAIL (HBJ Pipeline)

Main Stack

Main Stack

DM Water

Condenser

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GT#1

GT#2

220 KV

220 KV

Main Steam Line

By Pass Stack

By Pass Stack

10.5 KV

GEN. TR

GEN. TR

UAT6.6 KV

AIR intake

AIR intakeUAT

6.6 KV

137.758 MW

137.758 MW

STHPT

LPT

275.5 MW

WHRB#2

WHRB#1

156.07 MW

Gas / NapthaGAIL (HBJ Pipeline)

15.75 KV

10.5 KV

Main Stack

Main Stack

DM Water

Condenser

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GT#1

GT#2

220 KV

220 KV

Main Stack

Main Stack

Main Steam Line

By Pass Stack

By Pass Stack

10.5 KV

Gas / NapthaGAIL (HBJ Pipeline) DM Water

GEN. TR

GEN. TR

UAT6.6 KV

AIR intake

AIR intakeUAT

6.6 KV

137.758 MW

137.758 MW

STHPT

LPT

275.5 MW

WHRB#2

WHRB#1

156.07 MW

15.75 KV

10.5 KV

Condenser

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GT#1

GT#2

220 KV

220 KV

Main Steam Line

By Pass Stack

By Pass Stack

10.5 KV

Gas / NapthaGAIL (HBJ Pipeline)

GEN. TR

GEN. TR

UAT6.6 KV

AIR intake

AIR intakeUAT

6.6 KV

137.758 MW

137.758 MW

STHPT

LPT

275.5 MW

WHRB#2

WHRB#1

156.07 MW

15.75 KV

10.5 KV

Main Stack

Main Stack

DM Water

Condenser

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GT#1

GT#2

220 KV

220 KV

Main Steam Line

By Pass Stack

By Pass Stack

Flue Gas

10.5 KV

Gas / NapthaGAIL (HBJ Pipeline)

GEN. TR

GEN. TR

UAT6.6 KV

AIR intake

AIR intakeUAT

6.6 KV

137.758 MW

137.758 MW

555 °C200 MMWC

STHPT

LPT

275.5 MW

WHRB#2

WHRB#1

Flue Gas555 °C200 MMWC

156.07 MW

15.75 KV

10.5 KV

Main Stack

Main Stack

DM Water

Condenser

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GT#1

GT#2

220 KV

220 KV

Main Steam Line

By Pass Stack

By Pass Stack

10.5 KV

Gas / NapthaGAIL (HBJ Pipeline)

GEN. TR

GEN. TR

UAT6.6 KV

AIR intake

AIR intakeUAT

6.6 KV

137.758 MW

137.758 MW

STHPT

LPT

432 MW

WHRB#2

WHRB#1

156.07 MW

15.75 KV

10.5 KV

Main Stack

Main Stack

DM Water

Condenser

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GT#1

GT#2

220 KV

220 KV

Main Steam Line

By Pass Stack

By Pass Stack

10.5 KV

Gas / NapthaGAIL (HBJ Pipeline)

GEN. TR

GEN. TR

UAT6.6 KV

AIR intake

AIR intakeUAT

6.6 KV

137.758 MW

137.758 MW

STHPT

LPT

432 MW

WHRB#2

WHRB#1

156.07 MW

15.75 KV

10.5 KV

Main Stack

Main Stack

DM Water

Condenser

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GT#1

GT#2

220 KV

220 KV

Flue Gas

Main Steam Line

By Pass Stack

By Pass Stack

10.5 KV

Gas / NapthaGAIL (HBJ Pipeline)

GEN. TR

GEN. TR

UAT6.6 KV

AIR intake

AIR intakeUAT

6.6 KV

137.758 MW

137.758 MW

115 °C

Flue Gas115 °C

STHPT

LPT

432 MW

WHRB#2

WHRB#1

156.07 MW

15.75 KV

10.5 KV

Main Stack

Main Stack

DM Water

Condenser

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GT#1

GT#2

220 KV

220 KV

Flue Gas

83.11 KSC

Main Steam Line

By Pass Stack

By Pass Stack

73.7 KSC520 Deg C

10.5 KV

Gas / NapthaGAIL (HBJ Pipeline)

GEN. TR

GEN. TR

UAT6.6 KV

83.11 KSC

AIR intake

AIR intakeUAT

6.6 KV

137.758 MW

137.758 MW

115 °C

Flue Gas115 °C

STHPT

LPT

432 MW

WHRB#2

WHRB#1

156.07 MW

15.75 KV

10.5 KV

Main Stack

Main Stack

DM Water

Condenser

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GT#1

GT#2

220 KV

220 KV

Flue Gas

83.11 KSC

Main Steam Line

By Pass Stack

By Pass Stack

73.7 KSC520 Deg C

10.5 KV

Gas / NapthaGAIL (HBJ Pipeline)

GEN. TR

GEN. TR

UAT6.6 KV

83.11 KSC

AIR intake

AIR intakeUAT

6.6 KV

137.758 MW

137.758 MW

115 °C

Flue Gas115 °C

STHPT

LPT

LP steam

432 MW

WHRB#2

WHRB#1

156.07 MW

15.75 KV

10.5 KV

Main Stack

Main Stack

DM Water

Condenser

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Main components of CCGT Generator Compressor Combustion chamber Gas Turbine Boiler Steam turbine Condenser Vacuum pump Exciter Deaerator Transformer Water cleaning system

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Vacuum DeaeratorA vacuum deaerator is used for treatment of circulating water in HRSG.The circulating water should not contain oxygen as this increases the risk of corrosion on the system. The oxygen content can be reduced to under 0.2 mg/l with a vacuum deaerator. The oxygen-containing make-up water is preheated to 40-90 °C The vacuum pump creates the necessary vacuum so that the make-up water boils. When the water boils, the oxygen is liberated and removed by means of the vacuum pump.

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water management system

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Pretreatment of water At the pretreatment stage Ultra High Rate Clarifiers and Auto

Valveless Gravity Filters are used for reducing high turbidity and suspended solids in the water source.

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Boiler Feed Water Treatment Demineralisation Layered Bed Anion Unit with layers of two resins is used.

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Latest available treatments and products

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Study on compressor inlet temperature

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ABSTRACT Performance of a Gas Turbine is largely dependent on inlet air temperature. The power output of a turbine depends on the flow of mass through it. This is precisely the reason why on hot days, when air is less dense, power

output falls off. A rise of one degree Centigrade temperature of Inlet air decreases the

power output by 1% and at the same time heat rate of the turbine also goes up.

Curve depicting power output v/s air temperature characteristics

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Methods currently adopted by Industry (1) Vapour Compression - It is refrigerant type air-chilling system . Disadvantage in this system is higher power consumption to cool Inlet Air .

(2) Vapour Absorption Chillers - Steam is used to give the chilling effect. System consumes steam which reduces output of the steam Turbine .

(3) Evaporative coolers - It works on the principle of reducing the temperature of an air stream through water evaporation. Performance of the system is restricted by the amount of moisture present in the air .It works well in low humidity area.

(4) High Pressure Fog system - It is similar to evaporative cooling, but instead of using water as an evaporative medium, the water is atomized into billions of super-small droplets thereby creating a large evaporative surface area. drawback of overcooling in case of water droplets being too large, is the possibility of the compressor section getting eroded

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EARTH TUBE HEAT EXCHANGER ( ETHE)– A New method of cooling inlet air to Gas Turbine.

ETHE is a device that permits transfer of heat from ambient air to deeper strata of soil and vice versa. ETHE is based on the well-known fact that while ambient temperature varies cyclically (daily), the temperature of soil beyond a depth of around 2 meter remains virtually constant.

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Major advantages of this Method are – >> It is an Eco- friendly technology. >> Less running cost and is maintenance free.>> Can use in combination with other methods for maximum benefit. >> System can be developed locally without much dependency on others.

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QUERIES???