Turbine Condensate System in Thermal Power Plant

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27 December 2013 PMI Revision 00 1

TurbineCondensate

System


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Presentation outline Condensate Condensate System CEP Low Pressure Heaters Deaerator Function D/A Parts


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What is condensate The steam after condens ing in the condenser

known as condensate, is extracted ou t of the

condenser hot wel l by condensate pump and

taken to the deaerator th rough ejectors , glandsteam cooler and series o f LP heaters .


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Condensate systemCondensate Extraction Pump :

To pump out the condensate to D/A throughejectors, GSC and LPH

Gland Steam Condenser :To increase the temperature of condensate.

Condensate polishing unit :To remove cat-ion and an-ion from thecondensate.


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Condensate SystemsD/A level controller :To control the level of D/A.

Drain Cooler :

To increase the temperature of condensate

LPH :To increase the temperature of condensate

Deaerator :To remove the dissolved gases from the feed

water


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CEP Converts last stage steam of LPT to water

CONDENSER

CEP

GSC

CONDENSER

CPU DEAREATOR LEVEL

CONTROL

Minimum recirculation to condenser


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Condensate Pumps The function of these pumps is to pumps out the

condensate to the deaerator thru' ejectors, gland

steam cooler, and L.P. heaters. These pumps have

four stages and since the suction is at a negativepressure, special arrangements have been made

for providing sealing.


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Stages:

The pressure build up in 4 stages as suction is at negative

pressure.

Recirculation:

It is done when the de aerator level controller trips inorder to prevent cavitations.


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PMI Revision 00

CONSTRUCTIONAL

FEATURES OFCONDENSATE

EXTRACTION PUMP


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PMI Revision 00

DESIGN FEATURES OF CEP

Vertical, Multi Stage, Multi-Shaft.

Can type construction with suction nozzle integralwith Canister.

Double Suction first stage Impeller for minimum

NPSHR.

Balancing holes and tilting pad Thrust Bearing for

Axial Thrust.

Cutless rubber line bearings with axial flutes.

Shaft sealing by PTFE rope packing / Mechanical

Seals.

Compatible materials for stationary and rotating

parts.


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FIRST STAGE PUMP ASSEMBLY:

It consists of Pump Casing, a Double Suction Impeller and aSuction Bell Mouth.

SECOND TO LAST STAGE PUMP ASSEMBLIES :

It consists of Pump Casings and Single Suction Impellers.


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HEAD PIECE :

It incorporates the discharge and suction branchesand supports Thrust Bearing Housing & Driving

Motor.

It is sealed where the Shaft passes through Stuffing

Box which incorporates soft packing and a LanternRing.

Apertures are provided on Headpiece for accessing

Coupling, Thrust Bearing and Stuffing Box.An air vent pipe is incorporated in the Headpiece for

connection to the condenser tank.


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Condensate Flow

LPH1 LPH2 LPH3

CONDENSER CONDENSER CONDENSERCONDENSER

FROM

CONDENSER TO

DEAREATOR

DRIPWATER DRIPWATERDRIPWATER


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L.P. Heaters Turbine has been provided with non-controlled

extractions which are utilised for heating the

condensate, from turbine bleed steam. There are 3

or 4 low pressure heaters in which LP turbine lastextractions are used.


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LOW PRESSURE HEATERS

LPT

7RDSTAGEBFP

LPH3 LPH2 LPH1

LPT

3RDSTAGE

LPT

5RDSTAGE

CONDENSER

DC

D/A

DRIP DRIP DRIP


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LPT STAGES

3RDSTAGE

5THSTAGE

7THSTAGE


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Feed Water Heater A Feedwater heateris a component used to pre-heat water

delivered to the boiler. Preheating the feedwater reducesthe amount of energy needed to make steam and thusreduces plant operation costs. This improves thethermodynamic efficiency of the system.
http://upload.wikimedia.org/wikipedia/commons/c/ca/Heat_exc_1-1.png


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Flow arrangementIn parallel-flow heat

exchangers, the two fluids

enter the exchanger at the

same end, and travel inparallel to one another to

the other side. In counter-

f low heat exchangers the

fluids enter the exchanger

from opposite ends. The

counter current design is

most efficient, in that it

can transfer the most

heat.


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CONDENSER Converts last stage steam of LPT to water


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What is deareator?

Deaeratoris a device for air removal from water to

make it non-corrosive. Deaerator generally implies

not only the deaerator but also the feed water tank

below where deaerated water is stored and fed tothe suction of boiler feed pumps.


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Deaerator

The presence of certain gases, principally oxygen,

carbon-di-oxide and ammonia, dissolved in water is

generally considered harmful because of their

corrosive attack on metals, particularly at elevatedtemperatures.

function is to remove dissolved gases from the feed

water by mechanical means.


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Principle of Deaeration: Henrys law: The mass of gas with definite mass of

liquid will dissolve at a given temperature and isdirectly proportional to the partial pressure of thegas in contact with the liquid. This holds withinclose limits for any gas, which does not unitechemically with the solvent.

Solubility Law: Solubility of gases decreases with

increase m solution temperature and/or decrease inpressure.


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The deaerator comprises of two chambers:

Deaerating column.

Feed storage tank.


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Parts of D/A

Tubular type gauge glass.

High level alarm switch.

Low level alarm switch.

Pressure gauge.

Straight thermometers with pockets.

Safety valve

Isolating valves for steam pipes.


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DE R TOR WITH STOR GET NK


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DEAERATOR


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Water Spray in Deaerator


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TH NK YOU

Turbine Condensate System in Thermal Power Plant

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