a novel ultrasonic dynamic drainage tester
TRANSCRIPT
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A Novel Ultrasonic Dynamic Drainage Tester
Jinlan J X j n H a and H ining Xiao*Jinlan Ju, Xujun Hua and Huining Xiao*
FPInnovations, Canada
* University of New Brunswick, Canada
PaperCon 2011 Page 306
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Water Removal in Papermaking
Former Presses Dryers
1% 20% 45-50% 92%1% 20% 45 50% 92%
Solids Content
100
Fiber Water Content (kg/kg)
100
1010
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Cost of Water Removal
Relative cost to remove a given quantity of water:
$1 $58 $220Former Presses Dryers
Relative cost to remove a given quantity of water:
$1 $58 $220
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Conventional Drainage Tester
Canadian Standard F T tFreeness Tester:
Excellent tool for pulp lit t lquality control
PaperCon 2011 Page 309
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Dynamic Drainage Jar
A very useful device for d t i i fi tdetermining first pass retention.
PaperCon 2011 Page 310
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Modified Dynamic Drainage Jar
Dynamic Drainage Analyzer:
A simple test, but no turbulence duringdrainagedrainage
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Effect of Mixing on Drainage in Modified DDJ
400400
No mixing
300
ght (
g)
300
No mixing14.1s
Mixing at 400rpm
200
ate
Wei
g
200Mixing at 1000 rpm
Mixing at 400rpm17.0s
100
Filtr
a
100
38.1s
00 10 20 30 40 50
00 10 20 30 40 500 10 20 30 40 500 10 20 30 40 50
Time (sec)
PaperCon 2011 Page 312
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Fines Distribution of a Sheet Formed in a DDJ Under Continuous Mixingg
30
20
25
nt (%
)
15
s C
onte
n
5
10
Fine
s
00 0.1 0.2 0.3 0.4 0.5 0.6Wire side Thickness (mm) Top side
PaperCon 2011 Page 313
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Other Drainage Testers
Moving Belt Drainage Tester Pulsed Drainage DevicePulsed Drainage Device…
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Ultrasonic Dynamic Drainage Tester
Impeller
Vacuum Gauge
screen Impeller
Ultrasound HornVacuum Gauge
Vacuum PumpVacuum Pump
BalanceData Processing
PaperCon 2011 Page 315
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Data Collection
Web SolidsWater Retention Value
ate
Time
Filtr
a
e Time
Pres
sure
Time
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Ultrasonic Filtration Screen
Ultrasonic processor Filtration
screen
Ultrasonic filtration screenscreen
PaperCon 2011 Page 317
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Screen Unblocking and Deflocculation by Ultrasound in Standard Retention Test
100
%)
60
80
ntio
n (% Control
Control + Chitosan
40
60
es R
eten
20Fine With ultrasound Ultrasound + Chitosan
00 500 1000 1500
Impeller Rotating Speed (rpm)Impeller Rotating Speed (rpm)
PaperCon 2011 Page 318
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Drainage Profiles of a Newsprint FurnishAt 400 rpm with Mat Formation
400
No mixing, 14.1sUlt d 11 5
300
ht (g
)
Mixing + Ultrasound, 15.9s
Ultrasound, 11.5s
200
rate
Wei
g
Mixing, 17.0s
g
100
Filtr
00 10 20 30
Time (sec)
PaperCon 2011 Page 319
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Drainage and Retention with ChitosanAt 400 rpm with Mat Formation
UltrasoundMixing at 400 rpmNo MixingSample
11.517.014.1Pulp Alone
Drainage Time (s)
11.814.112.3Pulp + Chitosan
p
Fines Retention (%)
80 987 388 6Pulp + Chitosan
64.179.777.6Pulp Alone
Fines Retention (%)
16.87.611.0Increase in Retention
80.987.388.6Pulp + Chitosan
PaperCon 2011 Page 320
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Drainage Profiles of a Newsprint FurnishAt 1000 rpm with Mat Formation
400No mixing, 11.7sUltrasound, 10.0s 69.3%
300
ight
(g)
Mixing, 38.1s
53.6%
68 9%
200
ltrat
e W
e
30.9%
68.9%
Ultrasoun + Mixing, 10.7s
100
Fil
00 10 20 30 40
Time (sec)
PaperCon 2011 Page 321
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Retention Is Changed by Ultrasound Intensity
90
%)
80
ntio
n (%
TMP + Chitosan
70
es R
eten
60Fin
TMP
500 20 40 60 80 100
Ultrasound Amplitude (%)Ultrasound Amplitude (%)
PaperCon 2011 Page 322
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Pressure Profile under Various Turbulence Conditions
0000 10 20 30 40
a)
00 10 20 30 40
a)
-10
sure
(kPa
UltrasoundUltrasound & mixing at 1000 rpm
-10
sure
(kPa
UltrasoundUltrasound & mixing at 1000 rpm
-20
Pres No turbulence
-20
Pres No turbulence
-30
Mixing at 1000rpm
-30
Mixing at 1000rpm
-30
Time (sec)-30
Time (sec)
PaperCon 2011 Page 323
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Drainage vs. Pressure and Retention
30a)
30 100100
20sure
(kPa
20
80
ion
(%)80
= 0.4505Fines Retention
R2 = 0 7587um P
ress
Equilibrium Vacuum
= 0 7587
Equilibrium Vacuum
40
60
es R
eten
ti
40
60
R2 = 0.758710
Vacu
u = 0.758710
20
40
Fine
20
40
08 10 12 14 16 18
08 10 12 14 16 18
00
Drainage Time (s)Drainage Time (s)
PaperCon 2011 Page 324
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Fines Distribution of a Sheet Formed with Ultrasound
30
Under Continuous Mixing
20
25
nt (%
)
Under Continuous Mixing
15
s C
onte
n
5
10
Fine
s
With Ultrasound
00 0.1 0.2 0.3 0.4 0.5 0.6Wire side Thickness (mm) Top side
PaperCon 2011 Page 325
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Drainage Mechanism with Ultrasound
Before starting drainage test
Dewatering under mixing Dewatering under ultrasound
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Conclusions
• The turbulence induced by impellor in a conventional DDJ increases filtration resistance enormously.
• Ultrasound can Deflocculate fiber suspensionpUnblocking forming wireEnlarge dewatering channel in the web
• The Ultrasonic DDJ could be very useful laboratory tool to determine drainage under dynamic conditionsDrainage profileVacuum profileR t tiRetention
PaperCon 2011 Page 327
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Acknowledgements
• T. Owston Initial experimental work
• C. Castro Data processing program
G D i G L i i T O t & M D i ill• G. Dorris, G. Laivins, T. Owston & M. Drainville Filtrate weight and pressure monitoring
• I. Tihanyi & N.VignolaI. Tihanyi & N.Vignola Vessel and accessory manufacturing
• M. Laleg, J. Jong, I. Vadeiko, T. Owston and S. Middleton Valuable discussion
• NSERC IPS program• NSERC IPS program
PaperCon 2011 Page 328