Deaerator -thermal power plants

Deaerator for de-aeration of feed water

1. Stork Thermeq B.V.
®
Presentation
Stork
Thermeq BV
Start
Spray-type
Deaerator

2. Stork Thermeq B.V.
®
Presentation
Stork
Spray-type
Deaerator

3. Stork Thermeq B.V.
®
Application ConstructionGeneral
Deaerating process steps (1)
Principle
Venting
Performance
Step Item
1 Spray-device
2 Steam
Charging
Device (SCD)
3 Vessel
Function
100% heating up
Partial deaeration
Cooling steam to saturation
temperature
Steam distribution
Feedwater storage (no heating up)
Relief of non-condensable gases
Finalization of deaeration
Comparison
Retrofit
-Lay-out
-Operation
Conclusion

4. Stork Thermeq B.V.
®
•sprayer
•steam
•vessel
Deaerating process steps (2)
Principle
Venting
Performance
Comparison
Retrofit
-Operation
Application ConstructionGeneral
-Lay-out
Conclusion

5. Stork Thermeq B.V.
®Required temperature difference
for O
2 < 10 ppb
0
5
10
15
20
25
30
35
0 2 4 6 8 10
O
2-content at inlet (mg/l)
Temperature difference (°C)
Application ConstructionGeneral
Principle
Venting
Performance
Comparison
Retrofit
-Operation
-Lay-out
Conclusion

6. Stork Thermeq B.V.
®Typical vent-flow range
upto 1200 T/H and high O2 at inlet
0
10
20
30
40
50
60
70
80
90
100
0 2 4 6 8 10
Operating pressure (bara)
Ventflow per sprayer (kg/h)
Application ConstructionGeneral
Principle
Venting
Performance
Comparison
Retrofit
-Operation
-Lay-out
Conclusion

7. Stork Thermeq B.V.
®
Comparison; layout
Typical layout
Cascade or Spray/tray-type
Deaerators
Application ConstructionGeneral
Principle
Venting
Performance
Comparison
Retrofit
-Lay-out
-Operation
Conclusion

8. Stork Thermeq B.V.
®
Comparison; layout
Stork Spray-type
No vent condenser
One vessel:
•1 top platform
•min. insulation
•min. piping
•easy erection
•low total height
•earthquake optimal
Cascade Spray/tray-type
Vent condenser or high losses
Storage vessel + top tank:
•more platforms
•extended insulation
•balance lines, more length
•erection both tanks and piping
•extra total height top tank
•forces top tank to storage
vessel critical for earthquake-design
Application ConstructionGeneral
Principle
Venting
Performance
Comparison
Retrofit
-Lay-out
-Operation
Conclusion

9. Stork Thermeq B.V.
®
Comparison; layout
Stork Spray-type Cascade Spray/tray-type
Application ConstructionGeneral
Principle
Venting
Performance
Comparison
Retrofit
-Lay-out
-Operation
Conclusion

10. Stork Thermeq B.V.
®
Comparison; operation
Stork Spray-type
•heating-up with
standard steamrake
•operating range > 1:30
•no pressure difference
in steam area
Cascade Spray/tray-type
•additional heating
storage tank required
•operating range max. 1:4
•pressure difference
storage vessel and top tank
at high loads
Application ConstructionGeneral
Principle
Venting
Performance
Comparison
Retrofit
-Lay-out
-Operation
Conclusion

11. Stork Thermeq B.V.
®
Comparison; operation
Stork Spray-type
•water saturated with
rising pressure; easy
control
•simple pressure
control
•rate pressure decrease
limited by NPSH
feedwater pump
Cascade Spray/tray-type
•water subcooled with rising
pressure; sensitive control
•pressure control + feedforward
•rate pressure decrease is a
critical item in design top
tank
Application ConstructionGeneral
Principle
Venting
Performance
Comparison
Retrofit
-Lay-out
-Operation
Conclusion

12. Stork Thermeq B.V.
®
Retrofit spray-tray to Stork design
Stork Spray-type
Deaerator after retrofit 
Cascade-type Deaerator
before retrofit
Application ConstructionGeneral
Principle
Venting
Performance
Comparison
Retrofit
-Operation
-Lay-out
Conclusion

13. Stork Thermeq B.V.
®
Media
Media
Conventional
HRSG
Ranges
Vacuum
Flow to be deaerated
Heat supply to deaerator
condensate / feedwater
make-up / demin. water
superheated steam
saturated steam
wet steam (.. 90 %)
steam/water mixture (.. 1% steam)
hot water (flashing in internals)
Application ConstructionGeneral Conclusion

14. Stork Thermeq B.V.
®
Ranges
Pressure 0.2 –1.0 bara Vacuum to 1.3 bara
1.2 –20 bara Overpressure
Capacity 2 –120 T/H Type DN150; spring
7 –450 T/H Type DN250; spring
60 –660 T/H Type 600; disc
120 –1320 T/H Type 1200; disc
600 –6000 T/H 5x type 1200; disc
Diameter 1.6 –5.0 m Normal range
Length Limits of
workshop
Site assembly
possible
Application ConstructionGeneral
Media
Conventional
HRSG
Ranges
Vacuum
Conclusion

15. Stork Thermeq B.V.
®
Stork
From CR
Bypass
operation
Condensate
To HP-heaters
Application ConstructionGeneral
Media
Conventional
HRSG
Ranges
Vacuum
Conclusion

16. Stork Thermeq B.V.
®
Deaerator LP-drum
Condensate /
make-up water
To drum
HRSG
Economizer
Heat source: Water /
steam mixture
LP-Steam
Natural / forced
circulation
Evaporator
Application ConstructionGeneral
Media
Conventional
HRSG
Ranges
Vacuum
Conclusion

17. Stork Thermeq B.V.
®
Deaeration by ECO-water
LP-Steam = 0
Condensate /
make-up water
To drum
HRSG
Economizer
Heat source: Hot Eco-water
Application ConstructionGeneral
Media
Conventional
HRSG
Ranges
Vacuum
Conclusion

18. Stork Thermeq B.V.
®
Vacuum operation with gas
Condensate /
make-up water
To drum
HRSG
LP-Steam = 0
60 °C
Gas fired
Economizer
Heat source: Steam /
Hot Eco-water
Vacuum
venting
Application ConstructionGeneral
Media
Conventional
HRSG
Ranges
Vacuum
Conclusion

19. Stork Thermeq B.V.
®
Overpressure with oil
Condensate /
make-up water
To drum
HRSG
LP-Steam supply
135 °C
Oil fired
Economizer
Heat source: Steam /
Hot Eco-water
Application ConstructionGeneral
Media
Conventional
HRSG
Ranges
Vacuum
Conclusion

20. Stork Thermeq B.V.
®
Material selection
Material
Sprayers
Internals
PWHT
•Vessel
•Steam
charging
device
•Flow baffles
•Spray baffle
•Sprayer
Carbon steel
Carbon steel (principal)
Stainless steel
(erosion, high water content)
Carbon steel
Carbon steel
Stainless steel
Application ConstructionGeneral Conclusion

21. Stork Thermeq B.V.
®
Post Weld Heat Treatment
Quality
Saving on maintenance costs
Code requirement
Dependent on wallthickness
Optimal measure against
cracking based on worldwide
experience
NACE, VGB, S42
Client requirement
Obligation
Stork advice
Relevant standards
Application ConstructionGeneral
Materials
Sprayers
Internals
PWHT
Conclusion

22. Stork Thermeq B.V.
®
Disc type Spring type
Application ConstructionGeneral
Materials
Sprayers
Internals
PWHT
Conclusion

23. Stork Thermeq B.V.
®
Disc type Spring type (new)
Application ConstructionGeneral
Materials
Sprayers
Internals
PWHT
Conclusion

24. Stork Thermeq B.V.
®
Large
baffle
Small
baffle
Vortex
beaker
Spray
baffle
Standard design:
Y-type steamrake
Alternative &
combination
A / H type
Application ConstructionGeneral
Materials
Sprayers
Internals
PWHT
Stork deaerator
Conclusion

25. Stork Thermeq B.V.
®
Stork spray-type Deaerators
Attractive prices
Flexible design, minimum height
Minimize the maintenance budget
Satisfaction on your decision for years and years
Investing in deaerators you want

26. Stork Thermeq B.V.
®
End of Presentation
Stork
Thermeq BV
End