overview of factors affecting fouling in recovery...
TRANSCRIPT
![Page 1: Overview of Factors Affecting Fouling in Recovery …whitty/blackliquor/colloquium2003/pdfs...Overview of Factors Affecting Fouling in Recovery Boilers Honghi Tran University of Toronto](https://reader030.vdocument.in/reader030/viewer/2022011812/5e30a265b13030275e334e4a/html5/thumbnails/1.jpg)
Overview of Factors Affecting Overview of Factors Affecting Fouling in Recovery Boilers Fouling in Recovery Boilers
Honghi TranHonghi TranUniversity of TorontoUniversity of Toronto
Colloquium on Black Liquor combustion and Gasification, Colloquium on Black Liquor combustion and Gasification, Park City, May 12Park City, May 12--16, 16, 2003
![Page 2: Overview of Factors Affecting Fouling in Recovery …whitty/blackliquor/colloquium2003/pdfs...Overview of Factors Affecting Fouling in Recovery Boilers Honghi Tran University of Toronto](https://reader030.vdocument.in/reader030/viewer/2022011812/5e30a265b13030275e334e4a/html5/thumbnails/2.jpg)
Fouling
Plugging
![Page 3: Overview of Factors Affecting Fouling in Recovery …whitty/blackliquor/colloquium2003/pdfs...Overview of Factors Affecting Fouling in Recovery Boilers Honghi Tran University of Toronto](https://reader030.vdocument.in/reader030/viewer/2022011812/5e30a265b13030275e334e4a/html5/thumbnails/3.jpg)
Three Principal Parameters Determining the Rate of Fouling
ParticleConcentration
ParticleStickiness
Sootblowing Efficiency
![Page 4: Overview of Factors Affecting Fouling in Recovery …whitty/blackliquor/colloquium2003/pdfs...Overview of Factors Affecting Fouling in Recovery Boilers Honghi Tran University of Toronto](https://reader030.vdocument.in/reader030/viewer/2022011812/5e30a265b13030275e334e4a/html5/thumbnails/4.jpg)
ParticleConcentration
ParticleStickiness
Deposition
Less StickyLow Conc.
![Page 5: Overview of Factors Affecting Fouling in Recovery …whitty/blackliquor/colloquium2003/pdfs...Overview of Factors Affecting Fouling in Recovery Boilers Honghi Tran University of Toronto](https://reader030.vdocument.in/reader030/viewer/2022011812/5e30a265b13030275e334e4a/html5/thumbnails/5.jpg)
ParticleConcentration
ParticleStickiness
Deposition
Less StickyLow Conc.
SootblowingEfficiency
Fouling/Plugging
High Efficiency
![Page 6: Overview of Factors Affecting Fouling in Recovery …whitty/blackliquor/colloquium2003/pdfs...Overview of Factors Affecting Fouling in Recovery Boilers Honghi Tran University of Toronto](https://reader030.vdocument.in/reader030/viewer/2022011812/5e30a265b13030275e334e4a/html5/thumbnails/6.jpg)
Types of Particles
Carryover500 µm
(100 µm - 3 mm)
ISP20 µm
(1 - 100 µm)
Fume0.5 µm
(0.1 - 1 µm)
![Page 7: Overview of Factors Affecting Fouling in Recovery …whitty/blackliquor/colloquium2003/pdfs...Overview of Factors Affecting Fouling in Recovery Boilers Honghi Tran University of Toronto](https://reader030.vdocument.in/reader030/viewer/2022011812/5e30a265b13030275e334e4a/html5/thumbnails/7.jpg)
Carryover Fume
ISP
![Page 8: Overview of Factors Affecting Fouling in Recovery …whitty/blackliquor/colloquium2003/pdfs...Overview of Factors Affecting Fouling in Recovery Boilers Honghi Tran University of Toronto](https://reader030.vdocument.in/reader030/viewer/2022011812/5e30a265b13030275e334e4a/html5/thumbnails/8.jpg)
ISP Covered with Fume
![Page 9: Overview of Factors Affecting Fouling in Recovery …whitty/blackliquor/colloquium2003/pdfs...Overview of Factors Affecting Fouling in Recovery Boilers Honghi Tran University of Toronto](https://reader030.vdocument.in/reader030/viewer/2022011812/5e30a265b13030275e334e4a/html5/thumbnails/9.jpg)
Economizer
Superheater
Boiler Bank
![Page 10: Overview of Factors Affecting Fouling in Recovery …whitty/blackliquor/colloquium2003/pdfs...Overview of Factors Affecting Fouling in Recovery Boilers Honghi Tran University of Toronto](https://reader030.vdocument.in/reader030/viewer/2022011812/5e30a265b13030275e334e4a/html5/thumbnails/10.jpg)
Fume ISP
Carryover
![Page 11: Overview of Factors Affecting Fouling in Recovery …whitty/blackliquor/colloquium2003/pdfs...Overview of Factors Affecting Fouling in Recovery Boilers Honghi Tran University of Toronto](https://reader030.vdocument.in/reader030/viewer/2022011812/5e30a265b13030275e334e4a/html5/thumbnails/11.jpg)
Three Principal Parameters Determining the Rate of Fouling
ParticleConcentration
ParticleStickiness
Sootblowing Efficiency
![Page 12: Overview of Factors Affecting Fouling in Recovery …whitty/blackliquor/colloquium2003/pdfs...Overview of Factors Affecting Fouling in Recovery Boilers Honghi Tran University of Toronto](https://reader030.vdocument.in/reader030/viewer/2022011812/5e30a265b13030275e334e4a/html5/thumbnails/12.jpg)
Factors Affecting CarryoverConcentration
• Firing load• Air flow rate and distribution• Black liquor properties• Black liquor sprays
• Nozzle design• Liquor temperature and pressure• Liquor properties
![Page 13: Overview of Factors Affecting Fouling in Recovery …whitty/blackliquor/colloquium2003/pdfs...Overview of Factors Affecting Fouling in Recovery Boilers Honghi Tran University of Toronto](https://reader030.vdocument.in/reader030/viewer/2022011812/5e30a265b13030275e334e4a/html5/thumbnails/13.jpg)
Liquor Spray Study at Domtar Espanola
May 2, 2003
![Page 14: Overview of Factors Affecting Fouling in Recovery …whitty/blackliquor/colloquium2003/pdfs...Overview of Factors Affecting Fouling in Recovery Boilers Honghi Tran University of Toronto](https://reader030.vdocument.in/reader030/viewer/2022011812/5e30a265b13030275e334e4a/html5/thumbnails/14.jpg)
Three Principal Parameters Determining the Rate of Fouling
ParticleConcentration
ParticleStickiness
Sootblowing Efficiency
![Page 15: Overview of Factors Affecting Fouling in Recovery …whitty/blackliquor/colloquium2003/pdfs...Overview of Factors Affecting Fouling in Recovery Boilers Honghi Tran University of Toronto](https://reader030.vdocument.in/reader030/viewer/2022011812/5e30a265b13030275e334e4a/html5/thumbnails/15.jpg)
Factors Affecting Carryover Stickiness (Liquid Content)
• Particle composition• Black liquor composition (Cl, K)• Black liquor droplet size
• Particle temperature• Flue gas temperature• Retention time• All burning particles are sticky!
![Page 16: Overview of Factors Affecting Fouling in Recovery …whitty/blackliquor/colloquium2003/pdfs...Overview of Factors Affecting Fouling in Recovery Boilers Honghi Tran University of Toronto](https://reader030.vdocument.in/reader030/viewer/2022011812/5e30a265b13030275e334e4a/html5/thumbnails/16.jpg)
U of T Entrained Flow Reactor
Gas burner
Sample
Probe
Furnace9 m
Particles
Camera
![Page 17: Overview of Factors Affecting Fouling in Recovery …whitty/blackliquor/colloquium2003/pdfs...Overview of Factors Affecting Fouling in Recovery Boilers Honghi Tran University of Toronto](https://reader030.vdocument.in/reader030/viewer/2022011812/5e30a265b13030275e334e4a/html5/thumbnails/17.jpg)
0 mole% Cl/(Na+K)0 mole% Cl/(Na+K)
55
1010
2020
11
![Page 18: Overview of Factors Affecting Fouling in Recovery …whitty/blackliquor/colloquium2003/pdfs...Overview of Factors Affecting Fouling in Recovery Boilers Honghi Tran University of Toronto](https://reader030.vdocument.in/reader030/viewer/2022011812/5e30a265b13030275e334e4a/html5/thumbnails/18.jpg)
420 - 850 µm
300 - 420 µm
150 - 300 µm
Effect of Particle Size on Deposition
Mill “A” Black Liquor EFR Temp. = 800oC
![Page 19: Overview of Factors Affecting Fouling in Recovery …whitty/blackliquor/colloquium2003/pdfs...Overview of Factors Affecting Fouling in Recovery Boilers Honghi Tran University of Toronto](https://reader030.vdocument.in/reader030/viewer/2022011812/5e30a265b13030275e334e4a/html5/thumbnails/19.jpg)
Sticky Temperature540
560580
600
780
660640
620
800760
820
740720
700680
0
5
10
15
20
25
30
0 1 2 3 4 5Cl/(Na+K) mole%
K/(N
a+K
) mol
e%20 mole% CO3/(Na2+K2)
717oC
587oC
![Page 20: Overview of Factors Affecting Fouling in Recovery …whitty/blackliquor/colloquium2003/pdfs...Overview of Factors Affecting Fouling in Recovery Boilers Honghi Tran University of Toronto](https://reader030.vdocument.in/reader030/viewer/2022011812/5e30a265b13030275e334e4a/html5/thumbnails/20.jpg)
Prediction of Sticky Temperature
Black Liquor Composition
Particle Composition
Sticky Temperature
![Page 21: Overview of Factors Affecting Fouling in Recovery …whitty/blackliquor/colloquium2003/pdfs...Overview of Factors Affecting Fouling in Recovery Boilers Honghi Tran University of Toronto](https://reader030.vdocument.in/reader030/viewer/2022011812/5e30a265b13030275e334e4a/html5/thumbnails/21.jpg)
Carryover
Na2CO3(65)
Na2SO4(30)
NaCl (2)K-salts (2.5) Carbon/
impurities (1)
Composition (Wt%)
(50)
(45)
(2)(2.5) (1)
Oxidized Smelt
![Page 22: Overview of Factors Affecting Fouling in Recovery …whitty/blackliquor/colloquium2003/pdfs...Overview of Factors Affecting Fouling in Recovery Boilers Honghi Tran University of Toronto](https://reader030.vdocument.in/reader030/viewer/2022011812/5e30a265b13030275e334e4a/html5/thumbnails/22.jpg)
Carryover Particle Composition Continuously Changes
• Cl, K and carbonate contents are lower than previous thought
• S (sulphate and sulphide) content is higher • Changes depend strongly on particle size,
temperature and excess O2
![Page 23: Overview of Factors Affecting Fouling in Recovery …whitty/blackliquor/colloquium2003/pdfs...Overview of Factors Affecting Fouling in Recovery Boilers Honghi Tran University of Toronto](https://reader030.vdocument.in/reader030/viewer/2022011812/5e30a265b13030275e334e4a/html5/thumbnails/23.jpg)
Boiler 2
100 µm
20 sec5 sec
Boiler 2
100 µm
20 sec5 sec 20 sec5 sec
![Page 24: Overview of Factors Affecting Fouling in Recovery …whitty/blackliquor/colloquium2003/pdfs...Overview of Factors Affecting Fouling in Recovery Boilers Honghi Tran University of Toronto](https://reader030.vdocument.in/reader030/viewer/2022011812/5e30a265b13030275e334e4a/html5/thumbnails/24.jpg)
Factors Affecting SootblowingEfficiency
• Sootblower nozzle design• Blowing sequence and frequency• Deposit adhesion strength
• Composition• Tube temperature
• Tube arrangement
![Page 25: Overview of Factors Affecting Fouling in Recovery …whitty/blackliquor/colloquium2003/pdfs...Overview of Factors Affecting Fouling in Recovery Boilers Honghi Tran University of Toronto](https://reader030.vdocument.in/reader030/viewer/2022011812/5e30a265b13030275e334e4a/html5/thumbnails/25.jpg)
Three Principal Parameters Determining the Rate of Fouling
ParticleConcentration
ParticleStickiness
Sootblowing Efficiency
![Page 26: Overview of Factors Affecting Fouling in Recovery …whitty/blackliquor/colloquium2003/pdfs...Overview of Factors Affecting Fouling in Recovery Boilers Honghi Tran University of Toronto](https://reader030.vdocument.in/reader030/viewer/2022011812/5e30a265b13030275e334e4a/html5/thumbnails/26.jpg)
Deposit Removal Studies• Laboratory studies
• Composition• Tube surface temperature• Particle size
• Numerical simulation• Free jet• Jet-deposit interaction
• Field studies• Sootblowing efficiency
![Page 27: Overview of Factors Affecting Fouling in Recovery …whitty/blackliquor/colloquium2003/pdfs...Overview of Factors Affecting Fouling in Recovery Boilers Honghi Tran University of Toronto](https://reader030.vdocument.in/reader030/viewer/2022011812/5e30a265b13030275e334e4a/html5/thumbnails/27.jpg)
1.81.61.4
1.00.80.60.40.20.0
1.2
2 10 12 14 164 6 8mole% Cl/(Na+K)
PIP
(MPa
)
Probe temp.=400oC0% K% CO3
Effect of Chloride on Removal
![Page 28: Overview of Factors Affecting Fouling in Recovery …whitty/blackliquor/colloquium2003/pdfs...Overview of Factors Affecting Fouling in Recovery Boilers Honghi Tran University of Toronto](https://reader030.vdocument.in/reader030/viewer/2022011812/5e30a265b13030275e334e4a/html5/thumbnails/28.jpg)
Min
imum
PIP
(MPa
)
1.4
1.2
0.80.60.40.20.0
1.0
mole% K/(Na+K)0 5 10 15 20 25
5 mole%Cl/(Na+K)
2 mole% Cl/(Na+K)
Effect of Potassium on Removal
Probe temp.=400oC0% CO3
![Page 29: Overview of Factors Affecting Fouling in Recovery …whitty/blackliquor/colloquium2003/pdfs...Overview of Factors Affecting Fouling in Recovery Boilers Honghi Tran University of Toronto](https://reader030.vdocument.in/reader030/viewer/2022011812/5e30a265b13030275e334e4a/html5/thumbnails/29.jpg)
Nozzle
Pitot tube
Air Jet ImpingementApparatus
TubeArrays
![Page 30: Overview of Factors Affecting Fouling in Recovery …whitty/blackliquor/colloquium2003/pdfs...Overview of Factors Affecting Fouling in Recovery Boilers Honghi Tran University of Toronto](https://reader030.vdocument.in/reader030/viewer/2022011812/5e30a265b13030275e334e4a/html5/thumbnails/30.jpg)
Sootblowing Efficiency Studies at Domtar Espanola
May 2, 2003
![Page 31: Overview of Factors Affecting Fouling in Recovery …whitty/blackliquor/colloquium2003/pdfs...Overview of Factors Affecting Fouling in Recovery Boilers Honghi Tran University of Toronto](https://reader030.vdocument.in/reader030/viewer/2022011812/5e30a265b13030275e334e4a/html5/thumbnails/31.jpg)
Conclusions
![Page 32: Overview of Factors Affecting Fouling in Recovery …whitty/blackliquor/colloquium2003/pdfs...Overview of Factors Affecting Fouling in Recovery Boilers Honghi Tran University of Toronto](https://reader030.vdocument.in/reader030/viewer/2022011812/5e30a265b13030275e334e4a/html5/thumbnails/32.jpg)
ParticleConcentration
ParticleStickiness
Deposition
Less Sticky
Low Conc.
SootblowingEfficiency
Fouling/Plugging
High Efficiency
![Page 33: Overview of Factors Affecting Fouling in Recovery …whitty/blackliquor/colloquium2003/pdfs...Overview of Factors Affecting Fouling in Recovery Boilers Honghi Tran University of Toronto](https://reader030.vdocument.in/reader030/viewer/2022011812/5e30a265b13030275e334e4a/html5/thumbnails/33.jpg)
ParticleConcentration
ParticleStickiness
Deposition
Less Sticky
Low Conc.
SootblowingEfficiency
Fouling
High Efficiency
![Page 34: Overview of Factors Affecting Fouling in Recovery …whitty/blackliquor/colloquium2003/pdfs...Overview of Factors Affecting Fouling in Recovery Boilers Honghi Tran University of Toronto](https://reader030.vdocument.in/reader030/viewer/2022011812/5e30a265b13030275e334e4a/html5/thumbnails/34.jpg)
Alstom PowerAndritzAracruz CeluloseBabcock & WilcoxBoise Paper SolutionsBowaterCanforClyde-BergemannDaishowa-Marubeni
DomtarGeorgia Pacific International PaperIrving Pulp & PaperKvaerner PulpingMeadWestvacoStora-Enso ResearchVotorantim Celulose E PapelWeyerhaeuser Paper
NSERC
AcknowledgementsResearch Consortium on “Increasing Recovery Boiler Throughput and
Reliability of Recovery Boilers and Lime Kilns”