Upload
ashwani-dogra
View
233
Download
0
Embed Size (px)
Citation preview
8/13/2019 Turbine Condensate System in Thermal Power Plant
1/35
27 December 2013 PMI Revision 00 1
TurbineCondensate
System
8/13/2019 Turbine Condensate System in Thermal Power Plant
2/35
27 December 2013 PMI Revision 00 2
Presentation outline Condensate Condensate System CEP Low Pressure Heaters Deaerator Function D/A Parts
8/13/2019 Turbine Condensate System in Thermal Power Plant
3/35
27 December 2013 PMI Revision 00 3
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 .
8/13/2019 Turbine Condensate System in Thermal Power Plant
4/35
27 December 2013 PMI Revision 00 4
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.
8/13/2019 Turbine Condensate System in Thermal Power Plant
5/35
27 December 2013 PMI Revision 00 5
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
8/13/2019 Turbine Condensate System in Thermal Power Plant
6/35
27 December 2013 PMI Revision 00 6
CEP Converts last stage steam of LPT to water
CONDENSER
CEP
GSC
CONDENSER
CPU DEAREATOR LEVEL
CONTROL
Minimum recirculation to condenser
8/13/2019 Turbine Condensate System in Thermal Power Plant
7/35
27 December 2013 PMI Revision 00 7
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.
8/13/2019 Turbine Condensate System in Thermal Power Plant
8/35
27 December 2013 PMI Revision 00 8
8/13/2019 Turbine Condensate System in Thermal Power Plant
9/35
27 December 2013 PMI Revision 00 9
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.
8/13/2019 Turbine Condensate System in Thermal Power Plant
10/35
PMI Revision 00
CONSTRUCTIONAL
FEATURES OFCONDENSATE
EXTRACTION PUMP
8/13/2019 Turbine Condensate System in Thermal Power Plant
11/35
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.
8/13/2019 Turbine Condensate System in Thermal Power Plant
12/35
27 December 2013 PMI Revision 00 12
8/13/2019 Turbine Condensate System in Thermal Power Plant
13/35
27 December 2013 PMI Revision 00 13
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.
8/13/2019 Turbine Condensate System in Thermal Power Plant
14/35
27 December 2013 PMI Revision 00 14
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.
8/13/2019 Turbine Condensate System in Thermal Power Plant
15/35
27 December 2013 PMI Revision 00 15
Condensate Flow
LPH1 LPH2 LPH3
CONDENSER CONDENSER CONDENSERCONDENSER
FROM
CONDENSER TO
DEAREATOR
DRIPWATER DRIPWATERDRIPWATER
8/13/2019 Turbine Condensate System in Thermal Power Plant
16/35
27 December 2013 PMI Revision 00 16
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.
8/13/2019 Turbine Condensate System in Thermal Power Plant
17/35
27 December 2013 PMI Revision 00 17
LOW PRESSURE HEATERS
LPT
7RDSTAGEBFP
LPH3 LPH2 LPH1
LPT
3RDSTAGE
LPT
5RDSTAGE
CONDENSER
DC
D/A
DRIP DRIP DRIP
8/13/2019 Turbine Condensate System in Thermal Power Plant
18/35
27 December 2013 PMI Revision 00 18
LPT STAGES
3RDSTAGE
5THSTAGE
7THSTAGE
8/13/2019 Turbine Condensate System in Thermal Power Plant
19/35
27 December 2013 PMI Revision 00 19
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.png8/13/2019 Turbine Condensate System in Thermal Power Plant
20/35
27 December 2013 PMI Revision 00 20
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.
8/13/2019 Turbine Condensate System in Thermal Power Plant
21/35
8/13/2019 Turbine Condensate System in Thermal Power Plant
22/35
27 December 2013 PMI Revision 00 22
CONDENSER Converts last stage steam of LPT to water
8/13/2019 Turbine Condensate System in Thermal Power Plant
23/35
27 December 2013 PMI Revision 00 23
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.
8/13/2019 Turbine Condensate System in Thermal Power Plant
24/35
27 December 2013 PMI Revision 00 24
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.
8/13/2019 Turbine Condensate System in Thermal Power Plant
25/35
27 December 2013 PMI Revision 00 25
8/13/2019 Turbine Condensate System in Thermal Power Plant
26/35
27 December 2013 PMI Revision 00 26
8/13/2019 Turbine Condensate System in Thermal Power Plant
27/35
27 December 2013 PMI Revision 00 27
8/13/2019 Turbine Condensate System in Thermal Power Plant
28/35
27 December 2013 PMI Revision 00 28
8/13/2019 Turbine Condensate System in Thermal Power Plant
29/35
27 December 2013 PMI Revision 00 29
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.
8/13/2019 Turbine Condensate System in Thermal Power Plant
30/35
27 December 2013 PMI Revision 00 30
The deaerator comprises of two chambers:
Deaerating column.
Feed storage tank.
8/13/2019 Turbine Condensate System in Thermal Power Plant
31/35
27 December 2013 PMI Revision 00 31
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.
8/13/2019 Turbine Condensate System in Thermal Power Plant
32/35
27 December 2013 PMI Revision 00 32
DE R TOR WITH STOR GET NK
8/13/2019 Turbine Condensate System in Thermal Power Plant
33/35
27 December 2013 PMI Revision 00 33
DEAERATOR
8/13/2019 Turbine Condensate System in Thermal Power Plant
34/35
27 December 2013 PMI Revision 00 34
Water Spray in Deaerator
8/13/2019 Turbine Condensate System in Thermal Power Plant
35/35
27 December 2013 PMI Revision 00 35
TH NK YOU