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Particle Control
DonatoRubinetti
Introduction
ParticleTrajectories
CoupledPhysics
PhysicalModel
NumericalModel
ValidationModel
Summary
1
Particle ControlInnovation of Combustion Particle Control Technologies
Assisted by Numerical Modelling
Donato Rubinetti 1 Josef Wüest 2
1Institute of Thermal and Fluid EngineeringUniversity of Applied Sciences and Arts Northwestern Switzerland
2Institute of Bioenergy and Resource EfficiencyUniversity of Applied Sciences and Arts Northwestern Switzerland
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Particle Control
DonatoRubinetti
Introduction
Technology
Pellet Burner
ParticleTrajectories
CoupledPhysics
PhysicalModel
NumericalModel
ValidationModel
Summary
2
IntroductionIndustrial Relevance
• Cleaning of exhaust gases• Promote renewable energy sources• Electric filter producer OekoSolve
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Particle Control
DonatoRubinetti
Introduction
Technology
Pellet Burner
ParticleTrajectories
CoupledPhysics
PhysicalModel
NumericalModel
ValidationModel
Summary
3
IntroductionPellet Burner
Burner Unit
Heat Exchanger
+ Turbulators
Exhaust
Design Area
from: Liebi LNC LPK Pellet Burner Technical Documentation, 30.08.2011, www.liebilnc.ch
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Particle Control
DonatoRubinetti
Introduction
ParticleTrajectories
CoupledPhysics
PhysicalModel
NumericalModel
ValidationModel
Summary
4
Particle TrajectoriesEntire study overview and topic definition
Color legend:particle charges in number of elementary charges
Features
1 CFD
2 Electrostatics
3 Particle charging processes
4 Particle deposition study
5 Geometry variations
6 Parameter variations
7 ...
Here: Focus on improvingair ionization processes
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Particle Control
DonatoRubinetti
Introduction
ParticleTrajectories
CoupledPhysics
PhysicalModel
NumericalModel
ValidationModel
Summary
5
Coupled Physics
ESP-Geometry
Flow Electric Field
Particles
Drag Force
Particle-Air-Coupling
Corona-Wind
Ion-Air-Coupling
Electric Force Space Charge
Density
Particle Charging
strong influence moderate influence weak influence
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Particle Control
DonatoRubinetti
Introduction
ParticleTrajectories
CoupledPhysics
PhysicalModel
NumericalModel
ValidationModel
Summary
6
Physical ModelElectrostatics governing equations
∇2φ = −ρelε0
(1)
E∇ρel = −ρel
2
ε0(2)
φ electric potentialρel space charge densityε0 vacuum permittivityE electrical field
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Particle Control
DonatoRubinetti
Introduction
ParticleTrajectories
CoupledPhysics
PhysicalModel
NumericalModel
Test rig
COMSOLimplementation
2D Results
ValidationModel
Summary
7
Numerical ModelLaboratory test rig
-
Particle Control
DonatoRubinetti
Introduction
ParticleTrajectories
CoupledPhysics
PhysicalModel
NumericalModel
Test rig
COMSOLimplementation
2D Results
ValidationModel
Summary
8
Numerical ModelCOMSOL implementation
units in m
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Particle Control
DonatoRubinetti
Introduction
ParticleTrajectories
CoupledPhysics
PhysicalModel
NumericalModel
Test rig
COMSOLimplementation
2D Results
ValidationModel
Summary
9
Numerical Model2D results - charge density distribution comparison
blue: ground / red: -20kV / orange: -5kV
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Particle Control
DonatoRubinetti
Introduction
ParticleTrajectories
CoupledPhysics
PhysicalModel
NumericalModel
ValidationModel
Geometry
Result
Validation
Summary
10
Validation Model2D axissymmetric geometry
❶ ❸ ❷ ❹
❺
50 mm
180 mm
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Particle Control
DonatoRubinetti
Introduction
ParticleTrajectories
CoupledPhysics
PhysicalModel
NumericalModel
ValidationModel
Geometry
Result
Validation
Summary
11
Validation ModelResults - comparison of space charge density [C/m3]
15 kV 20 kV 25 kV 30 kV
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Particle Control
DonatoRubinetti
Introduction
ParticleTrajectories
CoupledPhysics
PhysicalModel
NumericalModel
ValidationModel
Geometry
Result
Validation
Summary
12
Validation ModelComparison with test rig data
0
2
4
6
8
10
12
14
16
18
5 10 15 20 25 30 35
Ele
ctr
ic C
urr
en
t [µ
A]
Voltage on Electrode [kV]
Exp Ring 1
Exp Ring 2
Exp Ring 3
Exp Ring 4
Sim Ring 1
Sim Ring 2
Sim Ring 3
Sim Ring 4
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Particle Control
DonatoRubinetti
Introduction
ParticleTrajectories
CoupledPhysics
PhysicalModel
NumericalModel
ValidationModel
Summary
13
Summary
Discussion
- 2D model → qualitatively appropiate- 3D model → not practicable- 2D axissymmetric model → trade-off
Achievements
- Model conceived, tested and applied- Successfully assist measurements and ongoing R&D
Conclusion & Outlook
- From test-case to industrially relevant model → demonstrates the power ofmultiphysics modelling for innovation purposes
- Further investigation and improvement guidance
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Particle Control
DonatoRubinetti
Introduction
ParticleTrajectories
CoupledPhysics
PhysicalModel
NumericalModel
ValidationModel
Summary
14
Thank you for your attention!
Fruitful discussions with
- Beat Müller
- Trpimir Brzovic
- Daniel Jud
from OekoSolve AG are gratefully acknowledged. Further thanks to the SwissCommission for Technology and Innovation.
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Particle Control
DonatoRubinetti
Appendix
ModellingObjective
Corona OnsetField Strength
ChargingProcesses
2D/3D i
2D/3D ii
2D/3D iii
2D/3D iv
Mesh 3D
Mesh 2D
Mesh 2Dr
15
Modelling Objective
Physical understanding
• Deep understanding of the occurring effects• Spot relevant factors for optimization
Assisting empirical work
• Compare simulation results and experimental data• Guidance on measurement approaches
Predictive purposes
• Accelerate further R & D• Feasability and performance studies
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Particle Control
DonatoRubinetti
Appendix
ModellingObjective
Corona OnsetField Strength
ChargingProcesses
2D/3D i
2D/3D ii
2D/3D iii
2D/3D iv
Mesh 3D
Mesh 2D
Mesh 2Dr
16
AppendixCorona Onset Field Strength
E0 = 3× 106fr
(ms + 0.03
√msde2
)(3)
ms =p
pref
TrefT
(4)
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Particle Control
DonatoRubinetti
Appendix
ModellingObjective
Corona OnsetField Strength
ChargingProcesses
2D/3D i
2D/3D ii
2D/3D iii
2D/3D iv
Mesh 3D
Mesh 2D
Mesh 2Dr
17
AppendixParticle Charging Processes
Diffusion Charging
qd(t) =2πε0kTdp
eln
(1 +
t
τd
)(5)
Field Charging
qf (t) =
(3ε
ε+ 2
)πε0Edp
2 t
t+ τf(6)
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Particle Control
DonatoRubinetti
Appendix
ModellingObjective
Corona OnsetField Strength
ChargingProcesses
2D/3D i
2D/3D ii
2D/3D iii
2D/3D iv
Mesh 3D
Mesh 2D
Mesh 2Dr
18
Appendix2D/3D comparison - Electrical field strength magnitude
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Particle Control
DonatoRubinetti
Appendix
ModellingObjective
Corona OnsetField Strength
ChargingProcesses
2D/3D i
2D/3D ii
2D/3D iii
2D/3D iv
Mesh 3D
Mesh 2D
Mesh 2Dr
19
Appendix2D/3D comparison - Electrical field strength x-direction
-
Particle Control
DonatoRubinetti
Appendix
ModellingObjective
Corona OnsetField Strength
ChargingProcesses
2D/3D i
2D/3D ii
2D/3D iii
2D/3D iv
Mesh 3D
Mesh 2D
Mesh 2Dr
20
Appendix2D/3D comparison - Electrical field strength y-direction
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Particle Control
DonatoRubinetti
Appendix
ModellingObjective
Corona OnsetField Strength
ChargingProcesses
2D/3D i
2D/3D ii
2D/3D iii
2D/3D iv
Mesh 3D
Mesh 2D
Mesh 2Dr
21
Appendix2D/3D comparison - Electrical field strength z-direction
-
Particle Control
DonatoRubinetti
Appendix
ModellingObjective
Corona OnsetField Strength
ChargingProcesses
2D/3D i
2D/3D ii
2D/3D iii
2D/3D iv
Mesh 3D
Mesh 2D
Mesh 2Dr
22
AppendixMesh 3D
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Particle Control
DonatoRubinetti
Appendix
ModellingObjective
Corona OnsetField Strength
ChargingProcesses
2D/3D i
2D/3D ii
2D/3D iii
2D/3D iv
Mesh 3D
Mesh 2D
Mesh 2Dr
23
AppendixMesh 2D
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Particle Control
DonatoRubinetti
Appendix
ModellingObjective
Corona OnsetField Strength
ChargingProcesses
2D/3D i
2D/3D ii
2D/3D iii
2D/3D iv
Mesh 3D
Mesh 2D
Mesh 2Dr
24
AppendixMesh 2D axisymmetric
IntroductionTechnologyPellet Burner
Particle TrajectoriesCoupled PhysicsPhysical ModelNumerical ModelTest rigCOMSOL implementation2D Results
Validation ModelGeometryResultValidation
Summary AppendixAppendixModelling ObjectiveCorona Onset Field StrengthCharging Processes2D/3D i2D/3D ii2D/3D iii2D/3D ivMesh 3DMesh 2DMesh 2Dr
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