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Optimal design and operation of a Draft Tube Spouted Bed Reactor for a
Optimal design and operation of a Draft Tube Spouted Bed Reactor for a
Outline
Outline
Traditional photocatalytic Reactors
Traditional photocatalytic Reactors
Motivation for DTSMB
Motivation for DTSMB
Process block diagram
Process block diagram
Annular bed Model
Annular bed Model
Draft tube model
Draft tube model
UV model (Intensity, Power, and Kinetics)
UV model (Intensity, Power, and Kinetics)
Operation limitations and specifications
Operation limitations and specifications
Test System
Test System
Design Parameters
Design Parameters
Model Constants
Model Constants
System Parameters
System Parameters
Problem Statement
Problem Statement
Schematic of Algorithm
Schematic of Algorithm
Results
Results
Results cont
Results cont
Results cont
Results cont
Optimal Design and Operation
Optimal Design and Operation
Conclusion
Conclusion
Acknowledgements
Acknowledgements
Optimal design and operation of a Draft Tube Spouted Bed Reactor for a
Optimal design and operation of a Draft Tube Spouted Bed Reactor for a

Презентация: «Optimal design and operation of a Draft Tube Spouted Bed Reactor for a photocatalytic process David Follansbee, John Paccione, Lealon Martin». Автор: Office 2004 Test Drive User. Файл: «Optimal design and operation of a Draft Tube Spouted Bed Reactor for a photocatalytic process David Follansbee, John Paccione, Lealon Martin.ppt». Размер zip-архива: 1047 КБ.

Optimal design and operation of a Draft Tube Spouted Bed Reactor for a photocatalytic process David Follansbee, John Paccione, Lealon Martin

содержание презентации «Optimal design and operation of a Draft Tube Spouted Bed Reactor for a photocatalytic process David Follansbee, John Paccione, Lealon Martin.ppt»
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1 Optimal design and operation of a Draft Tube Spouted Bed Reactor for a

Optimal design and operation of a Draft Tube Spouted Bed Reactor for a

photocatalytic process David Follansbee, John Paccione, Lealon Martin

Environmental Division Fundamentals of Environmental Systems Engineering

Tuesday, November 6, 2007

2 Outline

Outline

Motivation for process Process Model Parameters and Problem statement Results Conclusion and Future Work

3 Traditional photocatalytic Reactors

Traditional photocatalytic Reactors

Photocatalytic slurry reactors Batch configuration Photocatalyst particle separation Photocatalyst loading limitations Photocatalytic fixed bed reactors Cross sectional area limitations Longer reactor length for increase throughput High pressure drops Mass transfer and kinetics are coupled Photocatalyst coating of reactor walls Cross sectional and mass transfer limitations

4 Motivation for DTSMB

Motivation for DTSMB

Decoupling of mass transfer from kinetics Continual degradation of contaminant and regeneration of photocatalyst Counter-current design Photocatalyst immobilized on large, dense particles

Draft tube

Clean water outlet

Dirty Water inlets

5 Process block diagram

Process block diagram

Photo Reactor

Draft tube

Packed bed reactor

6 Annular bed Model

Annular bed Model

Gp

xi

GA

yo

Gp

xo

GA

yi

Assumptions: Counter current contact Constant fluid properties Costant particle size and density

A. Y. Khan. Titanium dioxide coated activated carbon: Masters thesis, University of Florida, 2003.

V. Manousiouthakis and L. L. Martin. Computers & Chemical Engineering, 28(8):1237–1247, July 2004.

7 Draft tube model

Draft tube model

Gp

GfD

Dt

Ht

Gp

GfD

?D

Z. B. Grbavcic, R. V. Garic, D. V. Vukovic, D. E. Hadzismajlovic, H. Littman, M. H. Morgan, and S. D. Jovanovic. Powder Technology, 72(2):183–191, Oct. 1992.

8 UV model (Intensity, Power, and Kinetics)

UV model (Intensity, Power, and Kinetics)

Gp

xo

DUV

HUV

Io

Gp

xi

Modeled as a PFR Pseudo first order reaction No mass transfer limitations

9 Operation limitations and specifications

Operation limitations and specifications

Mass flowrate can not exceed an upper limit where particles will not settle in annular bed Gp<(1-?mf)Aa?pva(max) Voidage in the draft tube has to be above a critical collapsing voidage and below 1 ?vc< ?D<1 The fluid velocity has to be great enough to ensure transport of particles u?1.5vt

10 Test System

Test System

Reactive Red degradation 2 mm catalyst particles TiO2/AC photocatalyst composites SiO2 substrate

11 Design Parameters

Design Parameters

?

?p

2507

kg/m3

?f

1000

kg/m3

?f

1.119*10-3

Ns/m2

Dt

1

in

DA

6

in

DUV

2

in

Dp

2

mm

At

AA

AUV

Ht

2.5

m

HUV

1.22

m

vterminal

0.257

m/s

g

9.81

m/s2

12 Model Constants

Model Constants

Umf

0.0205

m/s

?mf

1.74*106

kg/m-4

?mf

0.447

?vc

0.87

?

-0.9418

c1

0.9984

c2

-0.06014

Z. B. Grbavcic, R. V. Garic, D. V. Vukovic, D. E. Hadzismajlovic, H. Littman, M. H. Morgan, and S. D. Jovanovic. Hydrodynamic modeling of vertical liquid solids flow. Powder Technology, 72(2):183–191, Oct. 1992.

13 System Parameters

System Parameters

k

0.00833

s-1

I

180

W/m2

?

300

m-1

KA

602430

ppm-1

xt

0.272

kgcon/kgpar

Kla

0.00615

s-1

?

9.24

$/kWh

C.?M. So, M.?Y. Cheng, J.?C. Yu, and P.?K. Wong

C.?M. So, M.?Y. Cheng, J.?C. Yu, and P.?K. Wong

M.?Nazir, J.?Takasaki, and H.?Kumazawa

A.?Y. Khan. Titanium dioxide coated activated carbon

A.?Y. Khan. Titanium dioxide coated activated carbon

14 Problem Statement

Problem Statement

Given: Adsorptive mass transfer rates Contaminant degradation rates The annular flowrate and inlet concentration Target concentration Minimize

yi

10

ppm

yo

1

ppm

GfA

0.5

GPM

15 Schematic of Algorithm

Schematic of Algorithm

Sensitivity Analysis

Sensitivity Analysis

Minimizing objective function

16 Results

Results

17 Results cont

Results cont

18 Results cont

Results cont

19 Optimal Design and Operation

Optimal Design and Operation

HA

52.65 in

Gp

0.06 kg/s

Gf

5-25 GPM

?D

0.922-0.986

?

0.5-0.9 $/hr

20 Conclusion

Conclusion

Height of annular bed is insensitive to change in mass flowrate. Operating at a low mass flowrate (<0.1 kg/s) allows for the most robust performance. For the test system of TiO2/AC UV cost is high Motivates for optimization of catalyst properties i.e. density, UV adsorption, and kinetics Model must be experimentally validated Specifically the kinetics and mass transfer models

21 Acknowledgements

Acknowledgements

Dr. Howard Littman Dr. Joel Plawsky Dr. David Dziewulski (DOH and SUNY school of Public health) Martin Research Group RPI funding Department of Defense

22 Optimal design and operation of a Draft Tube Spouted Bed Reactor for a
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