On-Load Boiler Cleaning with Steam
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1 On-Load Boiler Cleaning with Steam CBW Clyde Bergemann Wesel Rev. 5 March 16, 2018 FPK II Combustion Chemistry II Åbo Akademi University, Åbo
2 Content Steam sootblower solution Different types of steam sootblowers Functional aspects Deposit removal Selection of sootblowers Important design aspects
3 Sootblower 3
4 Sootblower in operation 4
5 Cleaning mechanism Retractable sootblower 5
6 Cleaning mechanism - Part Retractable sootblower 6
7 Content Steam sootblower solution Different types of steam sootblowers Functional aspects Deposit removal Selection of sootblowers Important design aspects
8 On-load Cleaning Systems Superheater/ Re-Heater Retractable Oscillating Axial Jet Blower Part Retractable SMART RSG / SMART Helix Water Furnace Wall Blower Water Cannon Economiser Part Retractable Rake Rotating Element Air heater/gas heater Rake Jet Blower Optimisation & Automation SMART CLEAN SMART CONTROL DeNOx Rake 8
9 On-load Cleaning Systems Cleaning systems for the furnace Blowing medium: water SMART Cannon Blowing medium: steam Wall blower VS-H
10 On-load Cleaning Systems Wall blower VS-H Functional principle The nozzle head with two opposite highperformance nozzles is axially moved into the boiler The blowing process begins as soon as the nozzle head has reached the blowing position During this process the tube wall is cleaned in circular form A special valve control also enables cleaning of specific segments After performing the necessary number of rotations the nozzle head returns to its rest position
11 On-load Cleaning Systems Wall blower Cleaning pattern Operating radius Geometrical blowing radius Nozzle inclination Rest Position Reverse Position Jet diversion Travel Spiral cleaning pattern due to wall blower type that advances into the boiler as it cleans
12 On-load Cleaning Systems Superheater/ Re-Heater Retractable Oscillating Axial Jet Blower Part Retractable SMART RSG / SMART Helix Water Furnace Wall Blower Water Cannon Economiser Part Retractable Rake Rotating Element Air heater/gas heater Rake Jet Blower Optimisation & Automation SMART CLEAN SMART CONTROL DeNOx Rake 12
13 On-load Cleaning Systems Retractable Sootblower Functional principle The lance tube with two opposite highperformance nozzles, is helically moved into the boiler Consequently the blowing process begins shortly after the two nozzles have passed through the boiler wall During the blowing process the lance tube continues to move helically into the flue-gas path On reaching the end of travel position, the direction of movement changes and the lance tube returns to its rest position
14 On-load Cleaning Systems Superheater/ Re-Heater Retractable Oscillating Axial Jet Blower Part Retractable SMART RSG / SMART Helix Water Furnace Wall Blower Water Cannon Economiser Part Retractable Rake Rotating Element Air heater/gas heater Rake Jet Blower Optimisation & Automation SMART CLEAN SMART CONTROL DeNOx Rake 14
15 On-load Cleaning Systems Part Retractable Sootblower Functional principle The blowing tube of the part retractable sootblower is equipped with high-performance nozzles over the whole length and is movably supported in the flue-gas path During the blowing process the blowing tube continues to move helically into the flue-gas path On reaching the end of travel position, the direction of movement changes and the blowing tube returns to its rest position The blowing tube remains partly in the flue-gas path
16 On-load Cleaning Systems Oscillating Sootblower Functional principle Retractable oscillating sootblower PS-P/RS-P The lance tube with high-performance nozzles is moved in the boiler in oscillatory motion The blowing process begins as soon as the nozzles have passed through the boiler wall On reaching the end of travel position, the direction of movement changes and the lance tube returns to its rest position
17 On-load Cleaning Systems Superheater/ Re-Heater Retractable Oscillating Axial Jet Blower Part Retractable SMART RSG / SMART Helix Water Furnace Wall Blower Water Cannon Economiser Part Retractable Rake Rotating Element Air heater/gas heater Rake Jet Blower Optimisation & Automation SMART CLEAN SMART CONTROL DeNOx Rake 17
18 On-load Cleaning Systems Rake Sootblower - for the Economiser / Air Preheater / Gas-Gas Heater and DeNOx Functional principle The blowing rake is equipped with high performance nozzles blowing element remains in the flue-gas path During the blowing process the blowing rake continues to move axially into the flue-gas pass On reaching the end of travel position, the direction of movement changes and the blowing rake returns to its rest position
19 On-load Cleaning Systems Superheater/ Re-Heater Retractable Oscillating Axial Jet Blower Part Retractable SMART RSG / SMART Helix Water Furnace Wall Blower Water Cannon Economiser Part Retractable Rake Rotating Element Air heater/gas heater Rake Jet Blower Optimisation & Automation SMART CLEAN SMART CONTROL DeNOx Rake 19
20 On-load Cleaning Systems Rotating Element Sootblower Functional principle The blowing tube is equipped with nozzles over the whole length and rotates within the flue-gas path During the blowing process the blowing tube performs a prescribed number of rotations The blowing process ends when the necessary number of rotations has been performed Blowing tube remains and is supported in fluegas path
21 On-load Cleaning Systems Superheater/ Re-Heater Retractable Oscillating Axial Jet Blower Part Retractable SMART RSG / SMART Helix Water Furnace Wall Blower Water Cannon Economiser Part Retractable Rake Rotating Element Air heater/gas heater Rake Jet Blower Optimisation & Automation SMART CLEAN SMART CONTROL DeNOx Rake 21
22 On-load Cleaning Systems SMART Jet Blower Functional principle Cleaning is carried out by axial movement of the lance tube in steps, while the heater basket rotates The SMART Jet is typically deployed below the heater with the media jets cleaning upwards, but can also be fitted above the heater as a pair The use of inverters and encoders allow the step-wise travel and positioning of the lance and nozzles to be infinitely controlled Choice of online cleaning modes air/steam, LP and HP water HP water jetting up to 300 bar(g) for online cleaning basket blockages
23 On-load Cleaning Systems Superheater/ Re-Heater Retractable Oscillating Axial Jet Blower Part Retractable SMART RSG / SMART Helix Water Furnace Wall Blower Water Cannon Economiser Part Retractable Rake Rotating Element Air heater/gas heater Rake Jet Blower Optimisation & Automation SMART CLEAN SMART CONTROL DeNOx Rake 23
24 Content Steam sootblower solution Different types of steam sootblowers Functional aspects Deposit removal Selection of sootblowers Important design aspects
25 Sootblower 25
26 Retractable sootblower Travel: Blower valve: Feed tube: 0,3m - 20m over single or double rack (heavy-duty) Cast steel with adjustable throttle disc for varied blowing pressure 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 26
27 Retractable sootblowers (PS series) Lance Tube Guidance Electrical Equipment Covering System Rear Suspension Sealing & Scavenging Air Equipment Valve Actuating Mechanism Valve Wall Box Lance Tube Lance Tube Track Beam Blower Carriage Gear Motor Feed Tube Support Feed Tube Support 27
28 Content Steam sootblower solution Different types of steam sootblowers Functional aspects Deposit removal Selection of sootblowers Important design aspects
29 Failure due to axial crack formation Mussmann, UoToronto
30 Failure due to surface pitting/axial crack formation Mussmann, UoToronto
31 Failure due to spalling Mussmann, UoToronto
32 Deposit break-up by steam jet Mussmann, UoToronto 2009 Thin deposit Distance = 9 cm Soft deposit Break-up duration: 3 ms 32
33 Deposit break-up by steam jet Mussmann, UoToronto 2009 Thick deposit Distance = 9 cm Soft deposit Break-up duration: 9.50 ms 33
34 Deposit asymmetry Actual deposits in boilers Boiler tubes Deposit Carry-over Flue gas Mussmann, UoToronto
35 Deposit asymmetry Symmetric Asymmetric Deposit Steel tube Mussmann, UoToronto
36 Deposit asymmetry 90 JET Mussmann, UoToronto
37 Deposit asymmetry (0º vs. 90º) Mussmann, UoToronto
38 Content Steam sootblower solution Different types of steam sootblowers Functional aspects Deposit removal Selection of sootblowers Important design aspects
39 Cleaning mechanism Retractable sootblower 39
40 Sootblower Design Toolbox System design Official Release
41 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 41
42 Sootblower Design Toolbox Important design parameter for Steam sootblowers: Fuel and fuel specification Steam pressure & temperature (design and operation) Location of sootblower in boiler Distances and configuartion of heating elements, dimensions of elements (for cleaning) Fluegas temperature (max) Control setup and electrical configurations 42
43 Selection of blowing elements BFB (Bubbling Fluidized Boiler) boilers Example: BFB boiler burning wood waste Steam 25 bar(g) and 400 C Superheater: Max. fluegas temperature 900 C Retractable sootblower Blowing element material 13CrMo44 (creep: max temp. 560 C) Boiler bank: Max. fluegas temperature 720 C Part Retractable sootblower Blowing element material X10CrAl13 (creep: max temp. 800 C) 43
44 Content Steam sootblower solution Different types of steam sootblowers Functional aspects Deposit removal Selection of sootblowers Important design aspects
45 Quality of steam 45
46 Quality of steam 46
47 Recommended design principals for steam feeding systems 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 drain station. Short connecting pipe: Secure complete pre-heating; avoid cold pipe parts. 47
48 Titel der Präsentation 48
On-Load Boiler Cleaning with Steam
On-Load Boiler Cleaning with Steam CBW Clyde Bergemann Wesel 10.2007 - Rev. 5 March 16, 2017 FPK II Combustion Chemistry II Åbo Akademi University, Åbo The Cleaning Systems at a Glance 1 Furnace 5 Air
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