xx4 - On-load Boiler Cleaning with Steam - Åbo...

l 10.2

-Rev. 5

On-Load Boiler Cleaning

with Steam

March 16, 2017FPK II – Combustion Chemistry II

Åbo Akademi University, Åbo

24 - On-Load Boiler Cleaning with Steam

The Cleaning Systems at a Glance

� Part retractable sootblower

� Rotating element sootblower

� 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

Sootblower

Sootblower in operation

Sootblower Solutions - Types

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

� 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

Content

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.

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

VS-H – Functional aspects

Valve Actuating Mechanism

Construction KitNozzle Head Screw Spindle

Electrical Equipment(not shown in fig. above)

Gear Motor

Wall Box

Sealing & Scavenging Air Fan

Feed Tube

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

� Part retractable sootblowers

- PS-HB, RSG-HB

Content

� 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.

Operating principle –Retractable sootblower

Cleaning mechanism –Retractable sootblower

Retractable sootblowers

Retractable sootblower

� Travel: 0,3m - 20m over single or double rack (heavy-duty)

� 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

Retractable sootblowers (PS series)

Valve Actuating Mechanism

Rear Suspension

Track BeamLance Tube Blower Carriage Feed Tube

Lance Tube Guidance Covering SystemElectrical Equipment

Gear MotorWall Box

Sealing & Scavenging Air Equipment

Feed Tube Support

Lance Tube Support

Cleaning mechanism - Part Retractable sootblower

Part Retractable sootblower

� Travel: 0,3m - 8m over single or double rack (heavy-duty)

� 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)

Mussmann, UoToronto 2009

Failure due to axial crack formation

Failure due to surface pitting/axialcrack formation

Failure due to spalling

Break-up duration: 3 ms

Thin depositDistance = 9 cm

Soft deposit

Deposit break-up by steam jet

Thick depositDistance = 9 cm

Soft deposit

Break-up duration: 9.50 ms

Deposit break-up by steam jet

Deposit asymmetry – Actualdeposits in boilers

Flue gas

Deposit

Carry-over

Boiler tubes

Asymmetric

Deposit asymmetry

Deposit

Steel tube

Symmetric

Deposit asymmetry

Deposit asymmetry (0º vs. 90º)

� Part Retractable sootblowers

- PS-HB, RSG-HB

Content

Sootblower Design Toolbox

Official Release 1.0

System design

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

Quality of steam

� 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

34Titel der Präsentation

www.clydebergemann.com

xx4 - On-load Boiler Cleaning with Steam - Åbo...

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