24 28 april 2017, vienna, austria - media. · pdf file24–28 april 2017, vienna, austria...

24–28 April 2017, Vienna, Austria

A New Approach to Teach How to Analyze Tracing Results by a Rapid Visual Method

Olivier POTIER

Olivier Potier, ICARST 2017, 24–28 April 2017, Vienna, Austria2

Personal interests

2


Chemicaland processengineering

Watertreatment

Internationalrelationship

Innovativedesign

Innovation

Personal interests

2


HydrodynamicsmodelingTracing

Reactormodeling

Compartmentalmodeling

River

Micropollutants

Personal interests


Watertreatment


Innovativedesign

Innovation

2


HydrodynamicsmodelingTracing

Reactormodeling

Compartmentalmodeling

River

Micropollutants

this talk

Personal interests


Watertreatment


Innovativedesign

Innovation

2


Residence Time Distribution

3

Inlet

signalOutlet

signal


Residence Time Distribution

3

t

E(t)C(t)

t

00

1

N

)t(C.Q

dt

dN.

N)t(E

1

3

3

.. molm

mol

s

m1s

0

).(

)()(

dttC

tCtE

dttCQdN ).(.

sm

mol

s

m..

3

3

mol

00

0 ).().(. dttCQdttCQN

Inlet

sign

al

Outlet

signalPulse injection


Simple reactor models

4

CSTR(Continuous Stirred (Flow) Tank Reactor, Backmix Reactor,Mixed (Flow) Reactor,Gradientless Reactor)

Plug flow reactor

0 = ¶ uC( )¶z

æ

ææ

æ

ææ+

¶C

¶t

æ

ææ

æ

ææ


5

reactor in series

recycling

parallel

exchange

short-circuit

Systems are often more complex

How to represent them?

Use of virtual reactors to mimic the global hydrodynamics.


Systems are often more complex

6

CSTR(Continuous Stirred (Flow) Tank Reactor,

Backmix Reactor,Mixed (Flow) Reactor,Gradientless Reactor)

Plug flow reactor

Plug flow reactor with axial dispersion0 =

¶ uC( )¶z

æ

ææ

æ

ææ - D

¶2C

¶z2 +

¶C

¶t

æ

ææ

æ

ææ

Cascade of CSTRs

0 = ¶ uC( )¶z

æ

ææ

æ

ææ+

¶C

¶t

æ

ææ

æ

ææ

Q Q

J CSTRs

Pe= uL

DPeclet Number


Effect of flowrate change

7

Wastewater

Recycled sludge

REACTOR

settler

Example of the channel reactor:volume 3300 m3, total length 102 m


Effect of flowrate change

7

Wastewater

Recycled sludge

REACTOR

settler

Example of the channel reactor:volume 3300 m3, total length 102 m

0

5

10

15

20

25

30

40 90 140 190 240 290 340

J

t (min)

J (full scale plant)

J (pilot plant) 0

5

10

15

20

25

30

35

40

0,00 0,01 0,01 0,02 0,021/ t (min

-1)

Pe

STEP

pilote

t.

. 2

D

L

D

LuP

Water Research, Potier et al., 2005


Effect of flowrate, shape and size

7

Wastewater

Recycled sludge

REACTOR

settler

0

5

10

15

20

25

30

40 90 140 190 240 290 340

J

t (min)

J (full scale plant)

J (pilot plant) 0

5

10

15

20

25

30

35

40

0,00 0,01 0,01 0,02 0,021/ t (min

-1)

Pe

STEP

pilote

t.

. 2

D

L

D

LuP

Water Research, Potier et al., 2005

l

wl.w.Q

wh

hD aerationG

23

2

Water Research, Le Moullec et al., 2008


How to identify the kind of virtual reactors association?

8

Looking at the RTD graph, people need to be able to rapidly identify the kind of complex virtual reactors association in the system,

and so, need to understand:- the effect of parallel reactors association- the effect of the arrangement of reactors in series- that different associations can lead to similar RTD- the effect of recirculation


8

Looking at the RTD graph, people need to be able to rapidly identify the kind of complex virtual reactors association in the system,

and so, need to understand:- the effect of parallel reactors association- the effect of the arrangement of reactors in series- that different associations can lead to similar RTD- the effect of recirculation

TRAINING METHOD: we propose to use the software DTS in an unusual way to perform simulation of different kind of associations.

How to identify the kind of virtual reactors association?


TRAINING METHOD: CSTR

9


TRAINING METHOD: reactors in series

10



10

Series (CSTR + PFR)


TRAINING METHOD: Series or Parallel

11



11


TRAINING METHOD

12

CascadeOf CSTR


TRAINING METHOD

12

CascadeOf CSTR

CascadeOf CSTR


TRAINING METHOD: Parallel Cascades

13

MeasureCascade

of 2 CSTRs

Cascadeof 6 CSTRs

Cascadeof 20 CSTRs



13

MeasureCascade

of 2 CSTRs

Cascadeof 6 CSTRs

Cascadeof 20 CSTRs


TRAINING METHOD: cascades with recirculation

14

Cascade of15 CSTRs

Cascade of15 CSTRs


TRAINING METHOD: Stegosaurus RTD?

15


TRAINING METHOD: Stegosaurus RTD?

15

Thank you for your attention.


Chemical Reaction Engineering

4

Plug Flow Reactor: CSTR:

Example with a chemical reaction:

• Q=10 m3/h of a reactant solution

•Conversion Yield : 99 %

• A P

• First order kinetics (k = 4 h-1)

-rA = kCA = rP

Génie de la réaction chimique, Jacques Villermaux, Edition Tec&Doc Lavoisier



4

Volume of the Plug Flow Reactor:VPFR = t Q = 11,5 m3

Plug Flow Reactor:

h 151 990 1

1

4

1

X1

1

k

1 ,

,lnln

t

CSTR:

h 24,75

0,99 1

0,99

4

1

X1

X

k

1

t

Volume of the CSTR:VCSTR = t Q = 248 m3




• A P


-rA = kCA = rP




4

CSTR

PFR

Volume of the Plug Flow Reactor:VPFR = t Q = 11,5 m3

Plug Flow Reactor:

h 151 990 1

1

4

1

X1

1

k

1 ,

,lnln

t

CSTR:

h 24,75

0,99 1

0,99

4

1

X1

X

k

1

t

Volume of the CSTR:VCSTR = t Q = 248 m3

22V

V

PFR

CSTR




• A P


-rA = kCA = rP


24 28 april 2017, vienna, austria - media. · pdf file24–28 april 2017, vienna, austria...

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