This document provides an overview of a webinar about reducing energy consumption and CO2 emissions from deaerators. It discusses why deaerators are used, the different types of deaerators, typical energy usage and CO2 emissions, options for reducing energy usage such as retrofitting or replacing tray-type deaerators with more efficient spray-type models, and how to start the process for evaluating energy reduction opportunities. The presentation includes an agenda, descriptions of deaerator components and functions, comparisons of spray-type and tray-type deaerators, case studies of retrofitting and replacement projects, and discusses conducting feasibility studies and basic engineering.

1. Wij starten binnen enkele ogenblikken.
U kunt vragen stellen via de Q&A knop in het Zoom-menu.
Tijdens het webinar staan alle bezoekers op ‘mute’.
Welkom bij het Webinar
LAGER ENERGIEVERBRUIK EN CO2-UITSTOOT VAN ONTGASSERS

2. REDUCED ENERGY CONSUMPTION &
CO2 EMISSIONS FROM DEAERATORS

3. • Deaerator: why / what / where
• Deaerator types
• Deaerator energy usage and CO2 emissions
• Energy reduction options
• Business case
• How to start a reduction process
• Wrap-up
AGENDA
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DEAERATORS
WHY
Oxygen in steam/water cycles causes corrosion in steam boilers
Asset integrity is being compromised

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DEAERATORS
WHY
Install a ‘deaerator’ to remove dissolved
oxygen from the boiler feedwater!
(Deaeration = de-air a liquid or gas)

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• Removal of non condensable gases (O2, CO2) to protect boilers
• Preheating of condensate
• Storage time
Damaged economiser due to high O2 levels
in boiler feed water
Boroscopic inspection of boiler tube
DEAERATORS
WHAT

7. • Steam used for fabrication proces client
• Steam used for own energy boiler/turbine
Fossil fuel power plants Nuclear power plants
Solar power plants
Industrial plants FPSO’s
Pulp and paper Waste to energy plants Chemical plants
WHERE
INDUSTRIES & PROCESSES
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Spray-type
DEAERATOR TYPES
Tray-type

9. • One vessel design - no additional storage tank
• Min. Piping, min. Insulation, easy erection
• No vent condenser needed
• Operating range > 1:10
• No pressure difference in steam area
• < Assett managment
• Top vessel stainless steel
• Vent condenser needed
• Operating range max. 1:4
• Pressure difference storage vessel and top tank at high loads
• > Asset management
DEAERATOR TYPES
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Spray-typeTray-type
VS

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• One vessel design
• Condensate Sprayer section
• Steam injection device
• First phase: sprayer section
• Second phase: steam underneath water injection
• Instant reach of saturation temperature at Sprayer
DEAERATOR TYPES
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Spray-typeTray-type
• Top vessel – deaerator
• Bottom vessel – storage vessel
• Counterwise flow, capacity restricted
• Many tray packages for generation of droplets

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Typical values for the amount of blow-off steam:
- Steamloss Tray-type 600* kg/h (at least)
- 780 ton CO2/year
Typical values for the amount of blow-off steam:
- Steam loss Spray-type 70 kg/h
- 90 ton CO2/year
ENERGY USAGE & LOSS
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Spray-typeTray-type

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• Reduced steam losses result in <CO2 footprint
• OPEX reduction estimated EUR 100,000-300,000
per annum, depending on capacity
• Reduced environmental hazards, no O2 scavenger
• Reduced noise pollution
80% Less venting, noise levels from more than
85db to less than 80db
ENERGY USAGE & LOSS
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Phase 1
• Energy Quick scan complete system.
Energy savings on deaerators:
1. Retrofit from Tray-type to Spray-type deaerator
2. Replacement of Tray-type by Spray-type deaerator
ENERGY REDUCTION OPTIONS
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Energy scan by subject matter expert
• Insight in possible losses and advise
on possible savings
• Optimization of your process
• Out of the box mindset
ENERGY REDUCTION OPTIONS
PHASE 1 – ENERGY SCAN
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Consist of:
• Removal of dome
• Removal of internal storage tank.
• Re-use of storage tank Pressure vessel
• New internals
• New Sprayer and vent nozzle
• Re-arrangement top nozzles to a minimum
• BFW nozzle are kept
* Current state of Tray-type vessel must
be acceptable for this investment
ENERGY REDUCTION OPTIONS
OPTION 1: RETROFITTING TO SPRAY-TYPE
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KEY FIGURES SPRAY TYPE
• J006: OD3500x TL5700
• J012: OD3400x TL17260
• One vessel
• Min. piping, min insulation
• Easy erection
• No vent condenser required
• Operating range > 1:30 (vs
max 1:4)
• Best performance without
oxygen scavenger
• Low TCO
Before retrofit After retrofit
• Dome removed
• Internals replaced
• Less piping
• Less platforms
• Performance O2<0,005 PPB
DEAERATOR RETROFIT
TWO DOME-TYPE DEAERATORS AT A REFINERY IN GERMANY
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• Higher investment than retrofit
• New vessel including warranty's
• Goal to minimize piping change
• Minimizing shutdown period
• New vessel built according latest
standards and technology.
ENERGY REDUCTION OPTIONS
OPTION 2 – REPLACEMENT TO SPRAY-TYPE
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KEY FIGURES SPRAY TYPE
• One vessel
• Min. piping, min. insulation
• Easy erection
• No vent condenser required
• Operating range .
> 1:30 (vs max 1:4)
• Best performance without
oxygen scavenger
• Low TCO
Before replacement
After replacement
Savings:
530.000 US$/year
DEAERATOR REPLACEMENT
METHANOL PLANT NEW ZEALAND
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Current vessel life time study
 Retrofit cost

 Replacement cost

 Shutdown duration cost
Decision based on Return of Investment
ENERGY REDUCTION OPTIONS
WHICH OPTION TO CHOOSE – BUSINESS CASE
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Feasibility
Basic
Engineering
Detail
Engineering
Manufacturing
of new parts
Site
modification
Start-up
IT LEADS TO
REDUCED CO2 FOOTPRINT & HIGH SAVINGS
IT STARTS WITH
FEASIBILITY

21. Design your own deaerator
Deaerator Design Tool on
http://www.storkthermeq.com/login.aspx
*note: retrofit designs are often custom-made
and difficult to fit in our standard design tool.
If not possible, please contact us directly.
Feasibility following the Energy scan:
DESIGN YOUR OWN
SPRAY-TYPE DEAERATOR
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22. Questions?
Via Q&A
Jeroen Poot
jeroen.poot@stork.com
+31 6 2305 8409
Peter-Paul Henning
peterpaul.henning@stork.com
+31 6 1299 3477
Or contact our
23
LOWER ENERGY CONSUMPTION AND CO2 EMISSIONS
FROM DEAERATORS
17 JUNE, 2020June 17, 2020 Page 23

23. THANK YOU FOR
YOUR ATTENTION