17909909 intro tg auxilaries

8/14/2019 17909909 Intro TG Auxilaries

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Kinetic Electrical

Boiler

Generator ELECTRICITY

Turbine

Boilsw

ater

Heat

Steam

Magnet

Coil

Burning of fuel


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TURBINE

LUBE OIL SYSTEM

GLAND SEAL STEAM

CONDENSER

EJECTOR

CEP

GLAND STEAM CONDENSER

LP HEATER

DEAREATOR

BFP

HP HEATER

>>


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A steam turbine is a mechanical

device that extracts thermal energy from

pressurized steam, and converts it into

useful mechanical work.


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In the 1st century, The first steam

device that may be classified as areaction steam turbine was invented by

Hero of Alexandria in Egypt.

The modern steam turbine was

invented in 1884 by the Englishman

Charles A. Parsons, whose first model

was connected to a dynamo that

generated 7.5 kW of electricity.


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Impulse TurbineImpulse Turbine

Reaction TurbineReaction Turbine


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Purpose of Lube oil systemPurpose of Lube oil systemTo reduce the wear and tear of

the rotating elements.To maintain the temperature of

the bearings.


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Cooling of Turbine and Generator bearings.

Sealing medium in Hydrogen cooling system

Turbine barring gear operation.

Working fluid in Governing system

Using forUsing for


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Steam is supplied to the sealing chamber at 1.03to 1.05 Kg/sq.cm abs and at temperature 130deg.C To 150 deg.C from the header.

Air steam mixture from the last sealing chamber

is sucked out with the help of a special steamejector to gland steam cooler.

Provision has been made to supply live steam atthe front sealing of H.P. and I.P. rotor to control

the differential expansion, when rotor goes undercontraction during a trip or sharp load reduction.


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Seal ArrangementSeal Arrangement


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The steam after condensing in the

condenser known as condensate, is

extracted out of the condenser hot well

by condensate pump and taken to the

deaerator through ejectors, gland

steam cooler and series of LP heaters.

What is condensate?


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Steam Inlet

Cooling

water inlet

Cooling

water Outlet


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Steam Inlet

Cooling

water Outlet

Cooling

water inlet

Tube Bundle


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CONDENSER (For 800MW)

TYPE SURFACE TYPE

CW FLOW 89000 M3/HR.

DESIGN COOLING WATER TEMPERATURE 32 0C


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Ejector system uses steam as theEjector system uses steam as the

motive fluid to remove any non-motive fluid to remove any non-condensible gases that may becondensible gases that may be

present in the surface condenser.present in the surface condenser.

Purpose of Steam EjectorPurpose of Steam Ejector


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The function of CEP pumps is to pumps

out the condensate to the deaerator thru'

ejectors, gland steam cooler, and L.P.heaters. These pumps have multi stages

and since the suction is at a negative

pressure, special arrangements have

been made for providing sealing.


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CONDENSATE EXTRACTION PUMPS

3X50% - 850 M3/HR.


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Gland Steam Condenser Package pulls a slightGland Steam Condenser Package pulls a slightvacuum on the turbine shaft seals by means ofvacuum on the turbine shaft seals by means of

vacuum pumps, centrifugal blowers, or steamvacuum pumps, centrifugal blowers, or steam

ejectors. This allows capture of the leaked steamejectors. This allows capture of the leaked steam

and air mixture. Once captured, the steam isand air mixture. Once captured, the steam isseparated from the air and condensed in a shellseparated from the air and condensed in a shell

and tube condenser. The condensate drains out theand tube condenser. The condensate drains out the

bottom while the air is pulled out the top. Thebottom while the air is pulled out the top. The

condensed steam is then sent back to the steamcondensed steam is then sent back to the steam

cycle with the other condensate.cycle with the other condensate.


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To remove oxygen, carbon dioxide and otherTo remove oxygen, carbon dioxide and other

non condensable gases from feed waternon condensable gases from feed water

To heat the incoming makeup water and returnTo heat the incoming makeup water and returncondensate to an optimum temperature for:condensate to an optimum temperature for:

Minimizing solubility of the undesirable gasesMinimizing solubility of the undesirable gases

Providing the highest temperature water forProviding the highest temperature water for

injection to the boilerinjection to the boiler

Purpose of DeaerationPurpose of Deaeration


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Henrys law: The mass of gas with definitemass of liquid will dissolve at a giventemperature and is directly proportional to thepartial pressure of the gas in contact with theliquid. This holds within close limits for anygas, which does not unite chemically with the

solvent.Solubility Law: Solubility of gases decreases

with increase in solution temperature and/ordecrease in pressure.

Principle of Deaeration


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A Feed water heater is a component usedto pre-heat water delivered to the boiler.

Preheating the feed water reduces theamount of energy needed to make steamand thus reduces plant operation costs. Thisimproves the thermodynamic efficiency of

the system.

Purpose of HP&LP Feed water HeaterPurpose of HP&LP Feed water Heater


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For 660 MWFor 660 MW

Heater 1 Heater 2 Heater 3 Heater 4

Shell side : 0.35 MPa 0.35 0.53 0.53

150 oC 150 170 280

Tube side : 4.0 MPa 4.0 4.0 4.0

150 oC 150 160 160


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For 660 MWFor 660 MW


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A boiler feedwater pump is a specific type of pumpA boiler feedwater pump is a specific type of pump

used to pump feedwater into a steam boiler. The waterused to pump feedwater into a steam boiler. The water

may be freshly supplied or returning condensatemay be freshly supplied or returning condensateproduced as a result of the condensation of the steamproduced as a result of the condensation of the steam

produced by the boiler. These pumps are normallyproduced by the boiler. These pumps are normally

high pressure units that use suction from ahigh pressure units that use suction from a

condensate return system and can be of thecondensate return system and can be of thecentrifugal pump type or positive displacement type.centrifugal pump type or positive displacement type.

Purpose of Boiler Feed Water PumpPurpose of Boiler Feed Water Pump


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BFP Requirement For 800MW

NO 2W (TURBINE DRIVEN) + 1S ( AC MOTOR DRIVEN)

CAPACITY ( 2X50%-1545 M3/ /HR. APPROX.)

TURBINE DRIVEN

AC MOTOR DRIVEN


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Horizontal type Multistage Turbine

Pump Boiler Feed Pump for ThermalPower Plant

200mm x 150mm x 5S GM-CH

285m3/h x 921m x 930kW (Induction

Motor)


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17909909 intro tg auxilaries

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