Thorvald Ullum
Transcript of Thorvald Ullum
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Thorvald UllumFluid Mechanics Group
Test & Development
GEA Niro
Modelling the Spray Drying Process
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Process Engineering / GEA Niro2
The Spray Drying Process & CFD
3) Hot air
1) Liquid feed
2) Liquid atomization
4) Particle formation
5) Powder recovery
CFD inputs:
• Air inlet•Spray
•Heat loss
•Gas-particle interaction
CFD outputs:
• Air outlet
•Particle flow (deposits)
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Process Engineering / GEA Niro3
Particle Morphologies
water
solid core
2. Ranz-Marshall drying model1. Particle morphology examples
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Process Engineering / GEA Niro4
DRYNETICS™: 3 Parts
M
o i s t u r e
TimeTime
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DRYNETICS™ Part 1: CCD Video Sequence
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DRYNETICS™ Part 2
M
o i s t u r e
TimeTime
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DRYNETICS™ Part 2: Advanced Data Analysis
8
Time
T e m p e r a t u r e
P o s i t i o n
Size
Stickiness
T e m p e r a t u r e
Non-sticky
Sticky
D r y i n g r a t e
Moisture
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DRYNETICS™ Part 3
M
o i s t u r e
TimeTime
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DRYNETICS™ Part 3: CFD Setup – an Example
10
1. Standard models2. DRYNETICS™
• The product is
maltodextrin DE18
with a total feed rateof 96 kg/h.
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DRYNETICS™ Part 3: Air + Particle Streams
1. Gas path l ines
>
2. Tracks of droplets/particles
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DRYNETICS™ Part 3: Evaporation Rate
1. Standard 2. DRYNETICS™
Total: 63.4 kg/hTotal: 65.2 kg/h
Average particle
moisture at wall
collision is 0.4 wt%
and 9.0 wt%,respectively.
>>
12
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DRYNETICS™ Part 3: Single Particle History
0
0.2
0.4
0.6
0.8
1
P a r t i c l e h u m i d i t y
[ - ]
0 100 200 300 400 5000
20
40
60
80
100
P a r t i c l e t e m
p e r a t u r e
[ ° C ]
Normalized time, t/d02 [s/mm2]
DRYNETICSTM
Standard
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0.2 0.4 0.6 0.8 1 1.2 1.4
DRYNETICS™ Part 3: Rubbery Wall Deposits
2. Physical experiment1. CFD models
Standard:
1.2% rubbery
DRYNETICS™:
70% rubbery
14
[kg/m2h]
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(Very) Large Eddy Simulation
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