British Society of Sugar Technologists ATM 11th October 2018 · British Society of Sugar...
Transcript of British Society of Sugar Technologists ATM 11th October 2018 · British Society of Sugar...
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Tools for improving the separation in batch and continuous centrifugals
By Tim Diringer and Bjarne Christian Nielsen, Neltec Denmark A/S
British Society of Sugar Technologists ATM 11th October 2018 OXNEY VINEYARD, BECKLEY, RYE, EAST SUSSEX
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„Nowhere in processing can so much sugar
be lost so quickly and with so little notice
as in centrifugation“
Payne (1992)
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16% 1%
69%
14%
Sugar losses in cane sugar factories
Bagasse Filter Cake Molasses Unknown
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For batch centrifugals
A new approach to: 1. Reduce the risk of vibrations 2. Optimise the product quality 3. While reducing spray water 4. Get more uniform moisture 5. Improve run-off separation
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Signals given by the Neltec ColourQ 1700 BC
Colour
Filling
RPM
Purging
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What do the signals bring? The colour tells, when liquid is visible on the inside of the wall of crystals.
Stop acceleration at higher RPM until it is safe to proceed. The filling level tells, how well the capacity is utilised.
Increase filling at low static pressure, and when safe. The filling rate tells, how fast massecuite is feeding.
Get a warning at liquid massecuite. The purging rate tells, when it is time to start spraying in order to avoid
drying the film of mother liquor on the crystals. Avoid the need to increase spraying in order to clean dry crystals.
The purging rate tells for how long the spinning should continue. Avoid too dry or too wet crystals.
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When do we need to start spraying?
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0
200
400
600
800
1000
1200
0 50 100 150 200
Filling
Acceleration
Washing
Spinning
Deceleration
Discharge
Screen wash
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0
200
400
600
800
1000
1200
0 50 100 150 200
Filling
Acceleration
Washing
Spinning
Deceleration
Discharge
Screen wash
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Mother liquor
Wash syrup
Wash water
Early wash
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Late wash
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Old wisdom - Eichhorn, 1967
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When to start spraying
Using the purging signal
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Purging signal at washing time
50 %
1. The first spray (19:29:10 to 19:29:24) is a little early. A colour ring is seen.
2. The second spray (19:29:39 to 19:29:47) is too late. The purging rate has decreased to 50%. There is no trace of liquid on the inside of the crystal wall.
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25 %
When the purging is almost finished at start of spraying, the spray water rushes through the open structure of the already dry crystals in the sugar wall. Notice the immediate increase in purging. Massecuite properties are not taken into consideration by timers.
Purging signal at washing time
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Purging signal for run-off separation
25 %
The purging signal tells: 1. When the low purity run-off starts purging during basket filling. 2. When the syrup wash run-off starts purging. 3. When the high purity run-off from the water wash starts purging.
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When should decelaration start?
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Purging signal at start of decelaration
15 %
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20 %
Purging signal at start of decelaration
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Summary
The Neltec ColourQ 1700 BC can:
Prevent any significant amount of liquid on the sugar wall.
Pause or stop acceleration if a massecuite is not purging.
Start the water spray always at the same purging rate of the syrup leaving the centrifugal, thereby ensuring the most efficient use of spray water and getting the lowest ash.
Start the deceleration always at the same purging rate of the syrup leaving the centrifugal, thereby keeping the sugar moisture more uniform.
Help improving run-off separation.
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Continuous centrifugals
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Factors influencing the work in continuous centrifugals
Viscosity
Crystal size
Crystal size distribution
Crystal content
Water addition
Steam addition
Massecuite temperature Feed rate
„Due to the various influencing parameters, the molasses losses cannot be controlled. Optimization can only be approached by trial and error.“ „Continuous centrifugals need continuous attention by the operator.“
Payne (1992)
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Centrifugal control for continuous centrifugals
by using the Neltec ColourQ 1700
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Information given by the Neltec ColourQ 1700
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Sugar colour
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TESTS
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Set-up test 1
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20 l/min
15 l/min
10 l/min
5 l/min
Colour increase while reducing the combined water flow in test 1
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Set-up test 2
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20 l/min
15 l/min
10 l/min
5 l/min
0 l/min
Colour increase while reducing the combined water flow in test 2
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Set-up test 3
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Colour variation if water flow on lower valve is completely stopped (Timely high resolution signal)
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Set-up test 4
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Colour variation if water flow on lower valve is set to 2l/min (Timely high resolution signal)
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Comparison standard colour control vs.
colour control with ColourQ 1700CC
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Standard colour control Colour control with Neltec ColourQ 1700
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R² = 0.1555
0
5000
10000
15000
20000
25000
30000
35000
40000
15 20 25 30 35
Co
lou
r
water flow (l/min)
R² = 0.7939
0
5000
10000
15000
20000
25000
30000
35000
15 20 25 30 35
Co
lou
r water flow (l/min)
Standard colour control Colour control with Neltec ColourQ 1700CC
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Relation between C-sugar colour and molasses purity
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Date Time Sugar Molasses
Bx Pol Purity Colour Bx Pol Purity
20.03.2017
14:30 97.08 89.72 92.42 7864 83.36 33.68 40.40
18:00 96.4 84.4 87.55 13466 85.72 33.08 38.59
22:17 96.52 84.68 87.73 16473 86.62 32.47 37.49
09:00 96.92 89.88 92.74 5691 82.96 32.88 39.63
11:00 96.4 84.28 87.43 21453 85.76 32.6 38.01
14:00 95.68 81.24 84.91 21482 86.08 32.52 37.78
18:00 96.68 89.12 92.18 16525 84.2 31.72 37.67
23:46 97.48 88.16 90.44 12452 83.32 31.28 37.54
22.03.2017
08:00 96.8 87.2 90.08 19842 84.56 31.36 37.09
11:00 97.48 89.64 91.96 10942 84.12 31.76 37.76
14:15 97.2 91.88 94.53 7184 83.82 32.4 38.65
23:37 96.8 89.28 92.23 10589 84.56 32.16 38.03
23.03.2017
02:26 97.08 89.88 92.58 11508 85.52 32.65 38.18
08:00 96.28 82.16 85.33 20636 87.54 33.6 38.38
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36.50
37.00
37.50
38.00
38.50
39.00
39.50
40.00
40.50
41.00
5000 7000 9000 11000 13000 15000 17000 19000 21000 23000
pu
reza
mie
l fin
al
color semilla
Relation between molasses purity and sugar colour
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84.00
86.00
88.00
90.00
92.00
94.00
96.00
5000 7000 9000 11000 13000 15000 17000 19000 21000 23000
Pu
reza
se
mill
a
Color Semilla
Relation between sugar purity and sugar colour
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Process improvements
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Colour variations in March
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Colour variations in April
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Colour variations in automatic mode
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Tests published by factories/mills
ESST 2017 Amalgamated Sugar, Nampa factory. Published in Sugar Industry.
SIT 2018 American Sugar Refining, Chalmette refinery.
SIT 2018 British Sugar, Bury St. Edmunds factory.
ASSCT 2018 US Sugar, Clewiston.
More are under preparation.
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Thank you for your attention!