The Atomic Energy Organization of Iran (AEOI) A-10-1-34-6ad2edd

7/31/2019 The Atomic Energy Organization of Iran (AEOI) A-10-1-34-6ad2edd

http://slidepdf.com/reader/full/the-atomic-energy-organization-of-iran-aeoi-a-10-1-34-6ad2edd 1/16

J. of Nuclear Sci. and Tech.

5222-71389 No. 52, pp. 7-22, 2010

1 *2 1

-14155-775: پ گ -1

گ -2 81746-73441: پ

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.

:

Mathematical Modeling and Performance Analysis of a Rotary ReactorUsed for UO2 Production

J. Moshayyedi1, A. Rahimi*2, G.R. Jahanfarnia1

1- Nuclear Engineering Department, Science and Research Branch, Islamic Azad University, P.O. Box: 14155-775, Tehran - Iran

1- Chemical Engineering Department, Faculty of Engineering, University of Isfahan, P.O. Box: 81746-73441, Isfahan - Iran

Abstract: In the present study the rotary reactor used for producing UO2 from AUC is modeled. For

this purpose, the governing equations, including mass and energy balance equations for the existingspecies and phases are derived based on the conservation laws and then they were solved numerically.All other required parameters for solving the governing equations, including the geometricalcharacteristics of the solid bed, hydrodynamic conditions of the bed and reactor, thermo-physical

properties of gaseous and solid species and existing reactions were obtained from the literature and wereused. Individual reaction kinetics, presented in the literature for the reactions which are taking place in

this reactor, shows many shortages for condition in which all the reactions are taking into accountsimultaneously. Thus, for the first time, a new kinetics model is proposed and is applied successfuly. Theresults of using the model are in good agreement with the logical and expected behavior which can beobtained based on the principles of chemical engineering science.

Keywords: UO 2 , AUC, Rotary Reactor, Modeling, Kinetics Model

:[email protected] *email 11/4/89: پ 22/10/88:



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T e m p e r a t u r e D i s t r i b u t i o n ( K

)

Reactor Length (m)

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Reactor Length (m)

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. . .

گ

پ گ .

A گ ]2

[m

As [ گ m

m[

2

Awc

]m

m[

2

Awu گ

]

m

m[

2

3C NH 3 NH گ ]m

mol[

3

CPs [ گ K .kg

J[

CPg گ [ گ K .kg

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dwi [m]

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J[

Er

F0 ]2

[m

f

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1

L [m]

θ

ω ]s

rad[

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A

ρρ

−1

o

mگ ]s

kg[

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n گ ]s

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r ]s.m

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[m

T [K]

u bed ]s

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v ]3

[m

o

v گ ]s

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3

x

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z

α گ [rad]

β [rad]

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sε

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gε گ

τ [s]

aρ [ گچ m

kg[

3

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A*ρ [A گچ

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گ

Fr

cwg

گ

cgs گ

cws

rgs گ

rws

rwa

elect گ

s

g گ

cr

t.d AUS

Red 1 3UO 8O3U

Red 2 8O3U 2UO

zΔ zΔ

:پ

1- Rotary Kiln

2- Slipping

3- Slumping

4- Rolling

5- Cascading

6- Cataracting

- Centrifuging

- Filling Degree

- Filling Angle

References:

1. J.D. Sullivan, C.G. Maier, O.C. Ralston,“Passage of solid particles through rotarycylindrical kilns,” US Bureau of Mines,Technical Papers 384, 1-42 (1927).

2. W.C. Saeman, “Passage of solids throughrotary kilns,” Chem. Eng. Prog, 47, 508-514(1951).

3. E.F. Lebas, F. Hanrot, D. Ablitzer, J.L.Houzelot, “Experimental study of residencetime, particle movement and bed depth profilein rotary kilns,” Can. J. Chem. Eng, 73, 173-179 (1995).

4. M.D. Heydenrych, P. Gree, A.B.M. Heesink,G.F. Versteeg, “Mass transfer in rolling rotary

kilns: a novel approach,” Chem. Eng. Sci, 57,3851–3859 (2002).

5. L. Yang and B. Farouk, J & AWM A, 47, 1189-96 (1997).

6. H. Kramers and P. Crookewit, “The passage of granular solids through inclined rotary kilns,”Chem. Eng. Sci, 1, 259 (1952).

7. H. Heinen, J.K. Brimacombe, A.P. Watkinson,“Experimental study of transverse bed motion

in rotary kilns,” Metall. Trans, 14B, 191-205(1983).

8. A. Sass, “Simulation of the heat transfer phenomena in a rotary kiln,” P.D & D, 6(4),532-535 (1967).

9. F. Marias, H. Roustanb, Pichat, “A. Modellingof a rotary kiln for the pyrolysis of Aluminiumwaste,” Chem. Eng. Sci, 60, 4609-4622 (2005).

10. Ortiz, Su´arez, Nelson, “Dynamic simulation of a pilot rotary kiln for charcoal activation,”

Comput. Chem. Eng, 29, 1837–1848 (2005).

11. F. Patisson, E. Lebas, F. Hanrot, D. Ablitzer,J.L. Houzelot, “Coal pyrolysis in a rotary kiln:Part II. Overall Model Of The Furnace,”MMTB, 31B, 391-402 (2000).

12. F. Marias, “A model of a rotary kiln incinerator including processes occurring within the solidand the gaseous phases,” Comput. Chem. Eng,27, 813-825 (2003).

13. G.M. Miller, “Agglomeration drum selectionand design process,” Agglo. P. A. (2005).



. . .

14. V. Ramakrishnan, P.S.T. Sia, “Mathematicalmodeling of pneumatic char injection in a directreduction rotary kiln,” MMTB, 30B, 969-977(1999).

15. Ge. Qingren, K. Shifang, K, “Study of AUC

thermal decomposition kinetics in nitrogen by anon-isothermal method,” Thermochimica Acta,116, 71-77 (1987).

16. B. Dussoubs, J. Jourde, F. Patisson, J.L.Houzelot, D. Ablitzer, “Modeling of a moving

bed furnace for the production of uraniumtetrafluoride, Part 1: formulation of the model,”Chem. Eng. Sci, 58, 2617-2627 (2003).

17. L.A.H. Page, A.G. Fane, “The kinetics of hydrogen reduction of UO3 and U3O8 drivedfrom ammonium diuranate,” Inorg. Nucl.Chem, 36, 87-92 (1974).

Documents

The Atomic Energy Organization of Iran (AEOI) A-10-1-34-6ad2edd