xx4 - on-load boiler cleaning with steam - Åbo...
TRANSCRIPT
© C
BW
Cly
de B
erg
em
ann W
ese
l 10.2
007
-Rev. 5
On-Load Boiler Cleaning
with Steam
March 16, 2017FPK II – Combustion Chemistry II
Åbo Akademi University, Åbo
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24 - On-Load Boiler Cleaning with Steam
The Cleaning Systems at a Glance
� Part retractable sootblower
� Rotating element sootblower
3 ECO
� SMART Control� Remote Control
Automation
� SMART Clean
Optimisation
� Rake sootblower
4 DeNOx
� Part retractable sootblower
6 DeSOx
� Wall blower� Water cannon
1 Furnace
� Rake sootblower� Jetblower
5 Air heater/Gas heater
� Retractable sootblower� Oscillating sootblower� Axial sootblower� Jetblower� Part retractable
sootblower� SMART Helix
2 Superheater/Re-Heater
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34 - On-Load Boiler Cleaning with Steam
Sootblower
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44 - On-Load Boiler Cleaning with Steam
Sootblower in operation
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Sootblower Solutions - Types
54 - On-Load Boiler Cleaning with Steam
Sootblower Description
Retractable Sootblower� cleaning of heating surface banks
with heavy fouling and high flue gastemperatures
Part Retractable Sootblower� Cleaning of heating surface banks
with heavy fouling� Blowing tube remains in the flue gas pass
Principle
Wall Blower� Cleaning of wall heating surfaces
with heavy slagging � As steam or water blowers
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� Sootblower solutions
� Sootblower technology for the furnace
� Wall blower VS-H
� Sootblower technology for convective heat exchangers
� Retractable sootblowers
- PS-H, RSG-H, RXC-H
� Part Retractable sootblowers
- PS-HB, RSG-HB
� Important design features
64 - On-Load Boiler Cleaning with Steam
Content
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74 - On-Load Boiler Cleaning with Steam
Wall blower VS-H
� Nozzle head is axially moved into theboiler.
� Blowing process begins as soon as thenozzle head has passed through the tubewall.
� During the process, the tube wall is cleanedin circular form.
� On reaching the front end position, thedirection of movement changes and thenozzle head returns to its starting position.
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84 - On-Load Boiler Cleaning with Steam
Wall blower VS-H
� Blowing arc: 30° to 360°
� Blowing medium: Steam, air
� Blower valve: Cast steel with adjustable throttle disc for varied blowing pressure
� Screw spindle:
� Threaded tube with stuffing box casing
� Feed tube:
� Stainless steel; Ø60 mm
� Nozzle head:
� Heat resistant steel
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94 - On-Load Boiler Cleaning with Steam
VS-H – Functional aspects
Valve Actuating Mechanism
Construction KitNozzle Head Screw Spindle
Valve
Electrical Equipment(not shown in fig. above)
Gear Motor
Wall Box
Sealing & Scavenging Air Fan
Feed Tube
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10“On-Load “Boiler Cleaning Systems
VS-H – Cleaning pattern
Clenaing pattern of VS-H wall blower
Spiral cleaning pattern due to wall blower type that advances into the boiler as it cleans
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� Sootblower solutions
� Sootblower technology for the furnace
� Wall blower VS-H
� Sootblower technology for convective heat exchangers
� Retractable sootblowers
- PS-H, RSG-H, RXC-H
� Part retractable sootblowers
- PS-HB, RSG-HB
� Important design features
114 - On-Load Boiler Cleaning with Steam
Content
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� Blowing medium – Steam, air
� The lance with two opposite, high-performance nozzles helically moves intothe flue gas pass.
� The blowing process may begin as soon asthe two nozzles have passed through theboiler wall.
� During the blowing process the lance tubecontinues to move helically into the flue gaspass.
� On reaching the front-side end position thedirection of movement changes and thelance tube returns to its starting position.
4 - On-Load Boiler Cleaning with Steam
Operating principle –Retractable sootblower
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134 - On-Load Boiler Cleaning with Steam
Cleaning mechanism –Retractable sootblower
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144 - On-Load Boiler Cleaning with Steam
Retractable sootblowers
RSM-H
PS-H
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154 - On-Load Boiler Cleaning with Steam
Retractable sootblower
� Travel: 0,3m - 20m over single or double rack (heavy-duty)
� Blower valve: Cast steel with adjustable throttle disc for varied blowing pressure
� Feed tube:
� Stainless steel; Ø60 mm or Ø70 mm
� Lance tube:
� Creep resistant or high alloy steels
� O.D. Ø88,9 mm, Ø101,6 mm and Ø114,3 mm
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164 - On-Load Boiler Cleaning with Steam
Retractable sootblowers (PS series)
Valve Actuating Mechanism
Rear Suspension
Track BeamLance Tube Blower Carriage Feed Tube
Valve
Lance Tube Guidance Covering SystemElectrical Equipment
Gear MotorWall Box
Sealing & Scavenging Air Equipment
Feed Tube Support
Lance Tube Support
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Cleaning mechanism - Part Retractable sootblower
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184 - On-Load Boiler Cleaning with Steam
Part Retractable sootblower
� Travel: 0,3m - 8m over single or double rack (heavy-duty)
� Blower valve: Cast steel with adjustable throttle disc for varied blowing pressure
� Blowing tube:
� Of material creep resistant steel or of higher alloyed steel
� O.D. Ø60,3 / Ø 76,1 / Ø88,9 mm
� With welded-in nozzles and element bearings
� Feed tube:
� Stainless steel; Ø60 mm (or Ø70 mm in special cases)
� Lance tube:
� Creep resistant or alloy steel
� O.D. Ø88,9 mm (or Ø101,6 mm in special cases)
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194 - On-Load Boiler Cleaning with Steam
Mussmann, UoToronto 2009
Failure due to axial crack formation
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204 - On-Load Boiler Cleaning with Steam
Mussmann, UoToronto 2009
Failure due to surface pitting/axialcrack formation
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214 - On-Load Boiler Cleaning with Steam
Mussmann, UoToronto 2009
Failure due to spalling
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Break-up duration: 3 ms
Thin depositDistance = 9 cm
Soft deposit
Deposit break-up by steam jet
Mussmann, UoToronto 2009
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23
Thick depositDistance = 9 cm
Soft deposit
Break-up duration: 9.50 ms
Deposit break-up by steam jet
Mussmann, UoToronto 2009
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24
Deposit asymmetry – Actualdeposits in boilers
Flue gas
Deposit
Carry-over
Boiler tubes
4 - On-Load Boiler Cleaning with Steam
Mussmann, UoToronto 2009
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Asymmetric
Deposit asymmetry
Deposit
Steel tube
Symmetric
4 - On-Load Boiler Cleaning with Steam
Mussmann, UoToronto 2009
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0°
JET
90°
4 - On-Load Boiler Cleaning with Steam
Mussmann, UoToronto 2009
Deposit asymmetry
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27
Deposit asymmetry (0º vs. 90º)
4 - On-Load Boiler Cleaning with Steam
Mussmann, UoToronto 2009
© CBW Clyde Bergemann Wesel - Alle Rechte vorbehalten
� Sootblower solutions
� Sootblower technology for the furnace
� Wall blower VS-H
� Sootblower technology for convective heat exchangers
� Retractable sootblowers
- PS-H, RSG-H, RXC-H
� Part Retractable sootblowers
- PS-HB, RSG-HB
� Important design features
284 - On-Load Boiler Cleaning with Steam
Content
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29
Sootblower Design Toolbox
Official Release 1.0
System design
4 - On-Load Boiler Cleaning with Steam
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30
Sootblower Design Toolbox
� Project specific input parameters
� Calculation of fluid flow and mechanical stability including heat transfer
� Calculation of droop correction, steam consumption and jet profile
4 - On-Load Boiler Cleaning with Steam
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Quality of steam
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Quality of steam
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�
� Piping arrangement:
� Inclination for proper draining.
� Avoid “Christmas Tree” piping layout.
� Pre-heating control:
� Draining temperature controlled, not time controlled.
� Cleaning sequence:
� Start with sootblower nearest to the drainstation.
� Short connecting pipe:
� Secure complete pre-heating; avoid“cold” pipe parts.
Recommended design principals for steamfeeding systems
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