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An Overview of

SUPER THERMAL POWER STATION KAHALGAON (2340MW)

Presented By

XXXX XXXXXXCollege NAme

INTRODUCTIONIn Thermal Power Station fuel burns & use the resultant to make the steam, which drives TURBO GENERATOR

Water

Fuel Burns

Steam(Prime Mover)

Turbine(Coupled with Generator)

The Coal based Thermal Power Plant can be divided in Three Parts

THERMAL POWER PLANT

COAL FLOW AIR FLOW WATER(STEAM) FLOW

COAL IS TRANSFERRED FROM COAL MINES TO

POWER PLANT BY RAILWAY IN WAGONS

CRUSHER HOUSE (CRUSHED TO 20mm)

DEAD STORAGE (STORED FOR 40 DAYS COAL SUPPLY)

PULVERISER(PULVARISED TO 200 mesh)

BOILER (MIXED WITH HOT AIR AND BURNT)

COAL FLOW

STEAM(WATER) FLOW

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Describing the function of a Thermal Power plant

Some Important ComponentsBOILER :

The boiler is a rectangular furnace about 15m sides and 40m tall. Coal is burned inside the combustion chamber of boiler.

DRUM:

The temp is 540˚C and pressure is 150kg/sq.cm

SUPERHEATER:

After leaving the Boiler the steam is heated above its saturation temperature in Superheater. The temp is 540˚C and pressure is 150kg/sq.cm

REHEATER:

Reheater is also steam boiler component in which heat is added to this intermediate-pressure steam. The temp is 540˚C and pressure is 35kg/sq.cm

Condenser & Cooling Tower:

It is used to condense the steam coming out of the

Low pressure turbine

Economizer: Function of Economizer is to recover some of the heat from the flue gas and utilizes it to heat the feed water to going to the Boiler

ELECTRICAL COMPONENTSTURBO GENERATOR

A turbo generator is the combination of a turbine directly connected to an electric generator for the generation of electric power. 

At NTPC Kahalgaon hydrogen-cooled turbo generator is installed. It is a turbo generator with gaseous hydrogen as a coolant

Specification of 210MW unit(NTPC Kahalgaon)

Apparent Power: 247000kVA Active Power : 210000kW Stator Voltage : 15750V Stator Current : 9065A Power Factor : 0.85 Frequency : 50Hz Speed : 3000rpm

(3200rpm over speed) Coolant : Hydrogen

GENERATOR TRANSFORMERFrom the generator the electricity then goes to a transformer where the voltage is increased to about 420kV before sending it via cables

SPECIFICATIONS (NTPC Kahalgaon)

• Type : Two Winding• Maker : BHEL• Rating : 250MVA• Voltage Ratio:

15.47/420kV• Frequency : 50Hz• Vector Group : Yd

Other electric components used.. Circuit Breaker

Relay

Bus Bar

Isolators

Insulators

Lightning Arresters

Wave Trap

Instrument Transformer

Power Transformer

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