Stork Thermeq B.V.

®

Presentation

Stork Thermeq BV Start

Spray-type Deaerator

Stork Thermeq B.V.

®

Presentation

Stork

Spray-type

Deaerator

Stork Thermeq B.V.

®

Application ConstructionGeneral

Deaerating process steps (1)Principle

Venting

PerformanceStep Item

1 Spray-device

2 SteamCharging Device (SCD)

3 Vessel

Function

8 100% heating up

8 Partial deaeration

8 Cooling steam to saturation temperature

8 Steam distribution

8 Feedwater storage (no heating up)

8 Relief of non-condensable gases

8 Finalization of deaeration

Comparison

Retrofit

- Lay-out

- Operation

Conclusion

Stork Thermeq B.V.

®

• sprayer• steam• vessel

Deaerating process steps (2)Principle

Venting

Performance

Comparison

Retrofit

- Operation

Application ConstructionGeneral

- Lay-out

Conclusion

Stork Thermeq B.V.

®

Required temperature difference for O2 < 10 ppb

0

5

10

15

20

25

30

35

0 2 4 6 8 10

O2-content at inlet (mg/l)

Tem

pera

ture

diff

eren

ce (°

C)

Application ConstructionGeneral

Principle

Venting

Performance

Comparison

Retrofit

- Operation

- Lay-out

Conclusion

Stork Thermeq B.V.

®

Typical vent-flow range upto 1200 T/H and high O2 at inlet

0102030405060708090

100

0 2 4 6 8 10Operating pressure (bara)

Vent

flow

per

spr

ayer

(kg/

h)

Application ConstructionGeneral

Principle

Venting

Performance

Comparison

Retrofit

- Operation

- Lay-out

Conclusion

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

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

Venting

Performance

Comparison

Retrofit

- Lay-out

- Operation

Application ConstructionGeneral

Principle

Conclusion

Stork Thermeq B.V.

®

Comparison; layout

Stork Spray-type Cascade Spray/tray-type

Application ConstructionGeneral

Principle

Venting

Performance

Comparison

Retrofit

- Lay-out

- Operation

Conclusion

Stork Thermeq B.V.

®

Comparison; operation

Stork Spray-type

• heating-up withstandard steamrake

• operating range > 1:30

• no pressure differencein steam area

Cascade Spray/tray-type

• additional heating storage tank required

• operating range max. 1:4

• pressure differencestorage vessel and top tank at high loads

Venting

Performance

Comparison- Lay-out

Application ConstructionGeneral

Principle

Retrofit

- Operation

Conclusion

Stork Thermeq B.V.

®

Comparison; operation

Stork Spray-type

• water saturated withrising pressure; easy control

• simple pressurecontrol

• rate pressure decreaselimited 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

Stork Thermeq B.V.

®

Retrofit spray-tray to Stork design

Stork Spray-type Deaerator after retrofit ↓

← Cascade-type Deaeratorbefore retrofit

Application ConstructionGeneral

Principle

Venting

Performance

Comparison

Retrofit

- Operation

- Lay-out

Conclusion

Stork Thermeq B.V.

®

MediaMedia

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

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 assemblypossible

Application ConstructionGeneral

Media

Conventional

HRSG

Ranges

Vacuum

Conclusion

Stork Thermeq B.V.

®

StorkFrom CRBypass operation

Condensate

To HP- heaters

Application ConstructionGeneral

Media

Conventional

HRSG

Ranges

Vacuum

Conclusion

Stork Thermeq B.V.

®

Deaerator LP-drum

Condensate / make-up water

To drum

HRSG

Economizer

Heat source: Water /steam mixture

LP- Steam

Natural / forcedcirculation

Evaporator

Application ConstructionGeneral

Media

Conventional

HRSG

Ranges

Vacuum

Conclusion

Stork Thermeq B.V.

®

Deaeration by ECO-water

LP- Steam = 0

Condensate / make-up water

To drum

HRSG

EconomizerHeat source: Hot Eco-water

Application ConstructionGeneral

Media

Conventional

HRSG

Ranges

Vacuum

Conclusion

Stork Thermeq B.V.

®

Vacuum operation with gas

Condensate / make-up water

To drum

HRSG

LP- Steam = 0

60 °CGas fired

Economizer

Heat source: Steam /Hot Eco-water

Vacuumventing

Application ConstructionGeneral

Media

Conventional

HRSG

Ranges

Vacuum

Conclusion

Stork Thermeq B.V.

®

Overpressure with oil

Condensate / make-up water

To drum

HRSG

LP- Steam supply

135 °COil fired

Economizer

Heat source: Steam /Hot Eco-water

Application ConstructionGeneral

Media

Conventional

HRSG

Ranges

Vacuum

Conclusion

Stork Thermeq B.V.

®

Material selection

• 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

Material

Sprayers

Internals

PWHT

Application ConstructionGeneral Conclusion

Stork Thermeq B.V.

®

Post Weld Heat TreatmentQuality

Saving on maintenance costs

Code requirementDependent on wallthickness

Optimal measure againstcracking based on worldwideexperience

NACE, VGB, S42

Client requirement

Obligation

Stork advice

Relevant standards

Application ConstructionGeneral

Materials

Sprayers

Internals

PWHT

Conclusion

Stork Thermeq B.V.

®

Disc type Spring type

Application ConstructionGeneral

Materials

Sprayers

Internals

PWHT

Conclusion

Stork Thermeq B.V.

®

Disc type Spring type (new)

Application ConstructionGeneral

Materials

Sprayers

Internals

PWHT

Conclusion

Stork Thermeq B.V.

®

Largebaffle

Smallbaffle

VortexbeakerSpray

baffle

Stork deaerator

Standard design:

Y-type steamrake

Alternative & combination

A / H type

Application ConstructionGeneral

Materials

Sprayers

Internals

PWHT

Conclusion

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

Stork Thermeq B.V.

®

End of Presentation

Stork Thermeq BV End