progress in rb deposit removal studieswhitty/blackliquor... · 2006-08-02 · force exerted on a...
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Progress in Recovery Boiler Progress in Recovery Boiler Deposit Removal StudiesDeposit Removal Studies
Honghi TranPulp & Paper Centre University of TorontoToronto, CANADA
The 7th International Colloquium on Black Liquor Combustion and Gasification Jyväskylä, Finland, July 31 - August 2, 2006
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ResearchersResearchersFaculty
Markus BussmannDonald CormackHonghi Tran
Research StaffDr. I.M. Jameel*Dr. Andrei KaliazineDr. Morteza Eslamian
Graduate StudentsMark Martinnez*Secuk Ozcan*Resa Sabet*Kayhan Kermani*Danny Tandra*Babak EmamiAmeya Pophli
Note: * graduated or left
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Fouling of Tube SurfacesFouling of Tube SurfacesFouling rate is the difference between the deposit accumulation rate (Ra) and the deposit removal rate (Rr):
Rf = Ra - Rr
Much work has been done on Ra; little has been done on Rr
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Factors Affecting Deposit RemovalFactors Affecting Deposit RemovalForce exerted on the deposit the jetDeposit strengthDeposit-Jet interaction
Deposit
Nozzle
Sootblower Jet
Force
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Force Exerted on a DepositForce Exerted on a DepositDepends on:
Sootblower Jet Peak impact pressure (PIP)Nozzle design, lance pressure, steam flow rateDistance between nozzle and deposit
Deposit size (thickness), shape, locationJet-deposit interaction
Jet impact angleExposure time
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Deposit StrengthDeposit StrengthWhat strength?
Compressive strengthBend strength, orAdhesion strength
Difficult to reproduce the deposit-tube interfacial bond in the laboratory
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Fluid Deposit Fluid Deposit -- Jet InteractionJet Interaction
BrittleFluid(Plastic)
Tube
Deposit
Interfacialbond
Jet
Before
T0
BrittleFluid(Plastic)
Tube
Deposit
Interfacialbond
Jet
After
T0
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Brittle Deposit Brittle Deposit -- Jet InteractionJet Interaction
Brittle
Tube
Deposit
Interfacialbond
Jet
Before
Brittle
Tube
Interfacialbond
Jet
After
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Deposit Removal by Deposit Removal by DebondingDebonding
Jet
Blow from Front(Difficult)
Deposit
Jet
Blow from Behind(Easy)
Deposit
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Evidence of Evidence of DebondingDebonding
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Deposit Removal Studies Using EFRDeposit Removal Studies Using EFR
Deposit compositionTube surface temperatureDeposit thicknessJet impact angle Gas/particle velocityParticle sizeSO2
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1.81.61.4
1.00.80.60.40.20.0
1.2
2 10 12 14 164 6 8mole% Cl/(Na+K)
Min
imum
PIP
(MPa
)
Probe temp.=400oC0% K% CO3
Effect of Chloride on RemovalEffect of Chloride on Removal
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0 mole% K/(Na+K)
5 mole%
10 mole%
20 mole%
Effect of Potassium on Deposit RemovalEffect of Potassium on Deposit Removal(5 mole% Cl/(Na+K), no CO(5 mole% Cl/(Na+K), no CO33))
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Effect of SOEffect of SO22 on Removal on Removal
0.0
0.2
0.4
0.6
0.8
1.0
0 200 400 600 800 1000 1200
SO2 Conc., ppm
PIP,
MPa
600-710μ
425-600μ
300-425μ150–300μ
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Correlation between PIP & SulphateCorrelation between PIP & Sulphate
0.0
0.2
0.4
0.6
0.8
1.0
20 30 40 50 60 70 80Mole% SO4/(Na2+K2)
PIP
, MP
a
600-710um
425-600um
300-425um
150-300um
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Effect of Sulphate Content on Effect of Sulphate Content on TTStkStkEFR Tests, Black Liquor Particles + SO2
650
700
750
800
850
Stic
ky T
empe
ratu
re, o C
BL+SO2
650
700
750
800
850
0 20 40 60 80 1000 20 40 60 80 100mole% SO4/(Na2+K2)mole% SO4/(Na2+K2)
2
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Effect of Thermal SinteringEffect of Thermal Sintering
10 20 30 40 50 600.0
0.1
0.2
0.3
0.4
0.5
0
PIP,
MPa
0.0
0.1
0.2
0.3
0.4
0.5
0 10 20 30 40 50 60Exposure Time, min.
No SO2
350 ppm SO2350 ppm SO2
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ImplicationsImplicationsHigh SO2 makes deposits easier to remove, due probably to an increase in particle sticky temperatureIn a high (350 ppm) SO2 atmosphere, sulphation of carbonate reduces deposit strength with time
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Effects of Probe Temperature & Effects of Probe Temperature & ClClM
inim
um P
IP (M
Pa)
1.41.2
0.8
0.60.40.2
0.0
1.0
200 300 400 500 600Probe Temperature (oC)
5 mole%Cl/(Na+K)
10 mole%Cl/(Na+K)
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Economizer160-270oC: LOW
Superheater300-500oC: HIGH
Generating Bank270-300oC: MEDIUM
Tube Temperature & PIP Requirement
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JetJet--DepositDeposit--Tube InteractionTube InteractionAnalysis of Sootblowing VideosCFD Modeling and Laboratory StudiesFocus on both PIP and force
DistanceJet angleOff-set
Jet Deposit
Tube
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Effect of OffsetPlaten
Offset = 1.9 cm
5 cm
NozzleProbe
Jet
Platen
0
20
40
60
80
100
0 10 20 30 40X, cm
PIP
, psi
g
Predicted by CFDLib-SJT model
Experimental Data-This study
X
X/D
Platen
Offset = 1.9 cm
5 cm
NozzleProbe
Jet
Platen
0
20
40
60
80
100
0 10 20 30 40X, cm
PIP
, psi
g
Predicted by CFDLib-SJT model
Experimental Data-This study
X
Platen
Offset = 1.9 cm
5 cm
NozzleProbe
Jet
Platen
0
20
40
60
80
100
0 10 20 30 40X, cm
PIP
, psi
g
Predicted by CFDLib-SJT model
Experimental Data-This study
0
20
40
60
80
100
0 10 20 30 40X, cm
PIP
, psi
g
Predicted by CFDLib-SJT model
Experimental Data-This study
X
X/D
0.45 cm
0
20
40
60
80
100
120
0 5 10 15 20X, cm
PIP
, psi
gExperimental Data-This study
Platen
5 cm
Probe
Platen
Nozzle
Jet
X
Predicted by CFDLib-SJT model
X/D
0.45 cm0.45 cm
0
20
40
60
80
100
120
0 5 10 15 20X, cm
PIP
, psi
gExperimental Data-This study
Platen
5 cm
Probe
Platen
Nozzle
Jet
0
20
40
60
80
100
120
0 5 10 15 20X, cm
PIP
, psi
gExperimental Data-This study
0
20
40
60
80
100
120
0 5 10 15 20X, cm
PIP
, psi
gExperimental Data-This study
0
20
40
60
80
100
120
0 5 10 15 20X, cm
PIP
, psi
gExperimental Data-This study
Platen
5 cm
Probe
Platen
Nozzle
Jet
Nozzle
Jet
X
Predicted by CFDLib-SJT model
X/D
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Effect of Blowing Angle
Sootblower
Xδ
R
Platen
Sootblower
-90 -60 30- 0 30 60 90
Blowing Angle δ
V (inch/s)R (inch)
40
80
120
160160
00
V
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Jet between Plates: Velocity Contour
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Model Deposit Removal By Air JetModel Deposit Removal By Air JetPlaster of Paris : Water = 1:1
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Alstom PowerAracruz CeluloseBabcock & WilcoxBoise Paper SolutionsBowater CanadaCenibraClyde-BergemannDaishowa-MarubeniDiamond Power International
DomtarGeorgia PacificInternational PaperIrving Pulp & PaperKvaerner PulpingMeadWestvacoStora-Enso ResearchTembecVotorantim Celulose E Papel
NSERC
AcknowledgementsAcknowledgementsMembers of the Research Consortium on
Increasing Energy and Chemical Recovery in the Kraft Process