2 july 20151 turbine condensate system

April 19, 2023 1

Turbine Condensate

System

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April 19, 2023 PMI Revision 00 2

Presentation outline

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


What is condensate• 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.


Condensate system

• Condensate Extraction Pump : To pump out the condensate to D/A through ejectors, GSC and LPH

• Gland Steam Condenser : To increase the temperature of condensate.

• Condensate polishing unit : To remove cat-ion and an-ion from the condensate.


Condensate Systems D/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


CEP

• Converts last stage steam of LPT to water

CONDENSER

CEP

GSC

CONDENSER

CPU DEAREATOR LEVEL CONTROL

Minimum recirculation to condenser


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 negative pressure, special arrangements have been made for providing sealing.


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 in order to prevent cavitations.

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CONSTRUCTIONAL FEATURES OFCONDENSATE

EXTRACTION PUMP

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DESIGN FEATURES OF CEP•Vertical, Multi Stage, Multi-Shaft.•Can type construction with suction nozzle integral with 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.


FIRST STAGE PUMP ASSEMBLY:It consists of Pump Casing, a Double Suction Impeller and a Suction Bell Mouth.SECOND TO LAST STAGE PUMP ASSEMBLIES :It consists of Pump Casings and Single Suction Impellers.


HEAD PIECE :

It incorporates the discharge and suction branches and supports Thrust Bearing Housing & Driving Motor.It is sealed where the Shaft passes through Stuffing Box which incorporates soft packing and a Lantern Ring.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.


Condensate Flow

LPH1 LPH2 LPH3

CONDENSER CONDENSER CONDENSERCONDENSER

FROM CONDENSER TO

DEAREATORDRIPWATER DRIPWATERDRIPWATER


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 last extractions are used.


LOW PRESSURE HEATERS

LPT7RD STAGE

BFP

LPH3 LPH2 LPH1

LPT3RD STAGE

LPT5RD STAGE

CONDENSER

DC

D/A

DRIP DRIP DRIP


LPT STAGES

3RD STAGE

5TH STAGE

7TH STAGE


Feed Water Heater• A Feedwater heater is a component used to pre-heat water

delivered to the boiler. Preheating the feedwater reduces the amount of energy needed to make steam and thus reduces plant operation costs. This improves the thermodynamic efficiency of the system.


Flow arrangement In parallel-flow heat exchangers, the two fluids enter the exchanger at the same end, and travel in parallel to one another to the other side. In counter-flow 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.


Shell and tube heat exchanger

Two fluids, of different starting temperatures, flow through the heat exchanger. One flows through the tubes (the tube side) and the other flows outside the tubes but inside the shell (the shell side). Heat is transferred from one fluid to the other through the tube walls, either from tube side to shell side or vice versa.. In order to transfer heat efficiently, a large heat transfer area should be used, so there are many tubes. In this way, waste heat can be put to use..


CONDENSER

• Converts last stage steam of LPT to water


What is deareator?• Deaerator is 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 to the suction of boiler feed pumps.


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 elevated temperatures.

• function is to remove dissolved gases from the feed water by mechanical means.


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

liquid will dissolve at a given temperature and is directly proportional to the partial pressure of the gas in contact with the liquid. This holds within close limits for any gas, which does not unite chemically with the solvent.

• Solubility Law: Solubility of gases decreases with increase m solution temperature and/or decrease in pressure.


• The deaerator comprises of two chambers:• Deaerating column. • Feed storage tank.


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.


DEARATOR WITH STORAGE TANK


DEAERATOR


Water Spray in Deaerator


THANK YOU

2 july 20151 turbine condensate system

Documents

pmi revision

condensate pump

condenser slide

temperature of condensate

turbine condensate system

feed water slide

deareator dripwater

condenser tank