WELCOME TO

NTPC DADRI

• PRESENTED BY:• P.C SHARMA• ROLL.NO-1109631034• M.E –VIIth (B)

VGI(DADRI)

SUBMITTED TO:

MR. G.P SAHU

(ME, DEPARTMENT VGI(DADRI)

About NTPC

• NTPC, the largest power Company in India, was setup in 1975 to accelerate power development in the country.

• NTPC has installed capacity of 29,394 MW.• It has 15 coal based power stations (23,395 MW)• 7 gas based power stations (3,955 MW)• 4 power stations in Joint Ventures (1,794 MW). • The company has power generating facilities in

all major regions of the country. • It plans to be a 75,000 MW company by 2017.

NTPC DADRI

COALBASED

GAS

BASED

SOLARBASED

1820 MW

830 MW

5MW

TOTAL = 2655 MW

Coal to Electricity ….. Basics

Coal

Chemical Energy

Super Heated Steam

Pollutants

Thermal Energy

Turbine Torque

Heat Loss In Condenser

Kinetic Energy

Electrical Energy

Alternating current in

StatorMech. Energy Loss

ASHHeat

Loss

Elet. Energy Loss

WORKING OF STEAM POWER PLANT

• Coal is burnt in a boiler ,which converts water into steam.• The steam is expanded in a turbine used to drive alternator,which

converts mechanical energy of the turbine into electrical energy.• The steam expanded is condensed in a condenser to be feed into the

boiler again.

PROCESS CYCLE(RANKINE)

The most important constituents of a steam power station are:

a. Steam generating equipmentb. Condenserc. Prime mover(i.e turbine)d. Cooling towers e. Electrical equipment

Steam generating equipment includes:

• Boiler• Superheater• Economiser• Air Pre-heater

BoilerA boiler is closed vessel in which water is converted into steam by utilising the heat of coal combustion. Steam boilers are broadly classified into following two types:(a) Water tube boilers (b) Fire tube boilers

In a water tube boiler, water flows through the tubes and the hot gases of combustion flow over these tubes. Water-tube boilers are used for high-pressure boilers

Super heater

• A device which removes last traces of moisture.

• It helps in reduction in requirement of steam quantity.

• steam being dry reduces the mechanical resistance of turbine.

• No corrosion at the turbine blades.

Economiser and Air Pre-heater

• They are such devices which recover the heat from the flue gases on their way to chimney and raise the temperature of feed water.

• Economiser raises boiler efficiency.• Air Pre-heaters recover the heat from the

flue gases leaving the economiser and heat the incoming air required for combustion

Condenser

• Which condenses the steam at the exhaust of turbine.

• It creates a very low pressure at the exhaust of turbine, this helps in converting heat energy of steam into mechanical energy in the prime mover.

• The condensed steam can be used as feed water to the boiler.

Prime Mover (i.e. Turbine)A steam turbine is a mechanical device that extracts thermal energy from pressurized steam, and converts it into mechanical energy.About 86% of all electric generation in the world is by use of steam turbines.It has almost completely replaced the reciprocating piston steam engine.

BOILER GENERATOR

STEAM TURBINE

Cooling Towers

• Remove heat from the water discharged from the condenser so that the water can be discharged to the river or re circulated and reused.

• Air can be circulated in the cooling towers through natural draft and mechanical draft.

Coal Handling Plant Details

• Source of coal = Piparwar Mines North Karanpur (Jharkhand)

• Location = Near Ranchi

• Distance = 1200 Kms.

• Type of coal = F-grade (Washed)• E grade (Raw)• Coal requirement = 13,000 MT/Day• ( 04 rakes )

Ash Handling Technique

• A natural result from the burning of fossil fuels, particularly coal, is the emission of flyash. Ash is mineral matter present in the fuel. For a pulverized coal unit, 60-80% of ash leaves with the flue gas.

• Two emission control devices for flyash are the fabric filters and electrostatic precipitators.

• Electrostatic precipitators have collection efficiency of 99%, but do not work well for flyash with a high electrical resistivity (as commonly results from combustion of low-sulfur coal). In addition, the designer must avoid allowing unburned gas to enter the electrostatic precipitator since the gas could be ignited.

Top View of ESP Schematic Diagram

• The fluegas laden with flyash is sent through pipes having negatively charged plates which give the particles a negative charge. The particles are then routed past positively charged plates, or grounded plates, which attract the now negatively-charged ash particles.

• The particles stick to the positive plates until they are collected. The air that leaves the plates is then clean from harmful pollutants.

Side view of ESP Schematic Diagram

Coal Ash can be used in:

• Construction of embankments and fills• Construction of road in sub-base• Manufacture of cement• Manufacture of bricks/blocks• Filling as flowable fill material• Agriculture as soil amendment/source of

essential plant nutrients

`

INPUTS FOR GAS STATION

• Fuel –Natural gas (Primary) HSD (Alternate fuel)• Source of gas- APM, PMT:ONGC/RIL/BRITISH GAS RLNG :GAIL, IOCL, GSPCL.

KG-D6 : RIL

TRANSPORTATION:From GAIL through HBJ Pipeline.

. Source of HSD : IOCL, HPCL, BPCL through Rly. rakes.

COMBINED CYCLE OPERATION(ONE MODULE)

WHRB

GT1

BP

DU

CT HPD

LPD

WHRB

GT2

BP

DU

CT HPD

LPD

ST1

CW

Gas Turbine Unit-1

Gas Turbine Unit-2

Steam Turbine Unit-1

HP LP

HP

ST

EA

M (

61 B

AR

, 530

°C)

LP STEAM (5 KSC, 210°C)

Condenser

CEPTo Dearator

SOLAR PLANTSOLAR PLANTTotal capacity 5 MW

The total project capital cost is put at Rs. 48.59 crore.Wipro limited has designed the project over 27 acres of land within the premises of existing NTPC Dadri plant.