Transcript Presentation deaearator

®
Presentation
Start
Spray-type
Deaerator
Stork
Thermeq BV
Stork Thermeq B.V.
®
Presentation
Stork
Spray-type
Deaerator
Stork Thermeq B.V.
®
General
Construction
Conclusion
Deaerating process steps (1)
Principle
Performance
Application
Step
Item
1
Spray-device
Function
 100% heating up
 Partial deaeration
Venting
2
Steam
Charging
Device (SCD)
Comparison
- Lay-out
- Operation
Retrofit
3
Vessel
 Cooling steam to saturation
temperature
 Steam distribution
 Feedwater storage (no heating up)
 Relief of non-condensable gases
 Finalization of deaeration
Stork Thermeq B.V.
®
General
Application
Construction
Conclusion
Deaerating process steps (2)
Principle
Performance
Venting
• sprayer
• steam
• vessel
Comparison
- Lay-out
- Operation
Retrofit
Stork Thermeq B.V.
®
General
Application
Construction
Conclusion
Required temperature difference
for O2 < 10 ppb
Principle
Performance
Venting
Comparison
- Lay-out
- Operation
Temperature difference (°C)
35
30
25
20
15
10
5
0
Retrofit
0
2
4
6
8
10
O2-content at inlet (mg/l)
Stork Thermeq B.V.
®
General
Application
Construction
Conclusion
Typical vent-flow range
Principle
upto 1200 T/H and high O2 at inlet
Venting
Comparison
- Lay-out
- Operation
Retrofit
Ventflow per sprayer (kg/h)
Performance
100
90
80
70
60
50
40
30
20
10
0
0
2
4
6
8
10
Operating pressure (bara)
Stork Thermeq B.V.
®
General
Application
Construction
Conclusion
Comparison; layout
Principle
Typical layout
Performance
Cascade or Spray/tray-type
Deaerators
Venting
Comparison
- Lay-out
- Operation
Retrofit
Stork Thermeq B.V.
®
General
Application
Construction
Conclusion
Comparison; layout
Principle
Stork Spray-type
Cascade Spray/tray-type
No vent condenser
Vent condenser or high losses
One vessel:
Storage vessel + top tank:
• 1 top platform
• more platforms
• min. insulation
• extended insulation
• min. piping
• balance lines, more length
- Lay-out
• easy erection
• erection both tanks and piping
- Operation
• low total height
• extra total height top tank
• earthquake optimal
• forces top tank to storage
vessel critical for earthquake-design
Performance
Venting
Comparison
Retrofit
Stork Thermeq B.V.
®
General
Principle
Application
Construction
Conclusion
Comparison; layout
Stork Spray-type
Cascade Spray/tray-type
Performance
Venting
Comparison
- Lay-out
- Operation
Retrofit
Stork Thermeq B.V.
®
General
Principle
Performance
Application
Comparison
- Lay-out
Conclusion
Comparison; operation
Stork Spray-type
Cascade Spray/tray-type
• heating-up with
• additional heating
standard steamrake
Venting
Construction
storage tank required
• operating range > 1:30
• operating range max. 1:4
• no pressure difference
in steam area
• pressure difference
storage vessel and top tank
at high loads
- Operation
Retrofit
Stork Thermeq B.V.
®
General
Principle
Performance
Venting
Comparison
- Lay-out
- Operation
Application
Construction
Conclusion
Comparison; operation
Stork Spray-type
Cascade Spray/tray-type
• water saturated with
rising pressure; easy
control
• water subcooled with rising
pressure; sensitive control
• simple pressure
control
• pressure control + feedforward
• rate pressure decrease
limited by NPSH
feedwater pump
• rate pressure decrease is a
critical item in design top
tank
Retrofit
Stork Thermeq B.V.
®
General
Principle
Application
Construction
Conclusion
Retrofit spray-tray to Stork design
 Cascade-type Deaerator
before retrofit
Performance
Stork Spray-type
Deaerator after retrofit 
Venting
Comparison
- Lay-out
- Operation
Retrofit
Stork Thermeq B.V.
®
General
Application
Conclusion
Media
Media
Flow to be deaerated
Ranges
Construction
condensate / feedwater
make-up / demin. water
Heat supply to deaerator superheated steam
Conventional
saturated steam
wet steam (.. 90 %)
HRSG
steam/water mixture (.. 1% steam)
hot water (flashing in internals)
Vacuum
Stork Thermeq B.V.
®
General
Application
Construction
Conclusion
Ranges
Media
0.2 – 1.0 bara
Vacuum to 1.3 bara
1.2 – 20 bara
Overpressure
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
Pressure
Ranges
Capacity
Conventional
HRSG
Vacuum
Stork Thermeq B.V.
®
General
Application
Conventional
Conclusion
Stork
Media
Ranges
Construction
From CR
Bypass
operation
Condensate
HRSG
Vacuum
To HP- heaters
Stork Thermeq B.V.
®
General
Application
Construction
Conclusion
Deaerator LP-drum
Media
Condensate /
LP- Steam make-up water
Ranges
HRSG
Conventional
Evaporator
HRSG
Heat source: Water /
steam mixture
Vacuum
Economizer
To drum
Natural / forced
circulation
Stork Thermeq B.V.
®
General
Application
Construction
Conclusion
Deaeration by ECO-water
Media
LP- Steam = 0
Ranges
HRSG
Conventional
HRSG
Condensate /
make-up water
Vacuum
Heat source: Hot Eco-water
Economizer
To drum
Stork Thermeq B.V.
®
General
Application
Construction
Conclusion
Vacuum operation with gas
Media
Vacuum
venting
LP- Steam = 0
Ranges
HRSG
Conventional
Gas fired
60 °C
Condensate /
make-up water
HRSG
Vacuum
Economizer
Heat source: Steam /
Hot Eco-water
To drum
Stork Thermeq B.V.
®
General
Application
Construction
Conclusion
Overpressure with oil
Media
LP- Steam supply
Ranges
HRSG
Conventional
Oil fired
135 °C
Condensate /
make-up water
HRSG
Vacuum
Economizer
Heat source: Steam /
Hot Eco-water
To drum
Stork Thermeq B.V.
®
General
Application
Construction
Conclusion
Material selection
Material
• Vessel
Carbon steel
• Steam
charging
device
Carbon steel (principal)
PWHT
Sprayers
Stainless steel
(erosion, high water content)
Internals
• Flow baffles
Carbon steel
• Spray baffle
Carbon steel
• Sprayer
Stainless steel
Stork Thermeq B.V.
®
General
Application
Conclusion
Post Weld Heat Treatment
Materials
Client requirement
Quality
Saving on maintenance costs
PWHT
Sprayers
Construction
Obligation
Code requirement
Dependent on wallthickness
Internals
Stork advice
Optimal measure against
cracking based on worldwide
experience
Relevant standards NACE, VGB, S42
Stork Thermeq B.V.
®
General
Application
Disc type
Construction
Conclusion
Spring type
Materials
PWHT
Sprayers
Internals
Stork Thermeq B.V.
®
General
Materials
Application
Disc type
Construction
Conclusion
Spring type (new)
PWHT
Sprayers
Internals
Stork Thermeq B.V.
®
General
Application
Conclusion
Stork deaerator
Materials
PWHT
Construction
Standard design:
Y-type steamrake
Sprayers
Internals
Alternative &
combination
A / H type
Vortex
beaker
Spray
baffle
Large
baffle
Small
baffle
Stork Thermeq B.V.
®
Investing in deaerators you want
Attractive prices
Flexible design, minimum height
Minimize the maintenance budget
Satisfaction on your decision for years and years
Stork spray-type Deaerators
Stork Thermeq B.V.
®
End of Presentation
End
Stork
Thermeq BV
Stork Thermeq B.V.