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International Heat Transfer Conference 7

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

TWO-PHASE MODEL OF A TUBULAR NONADIABATIC REACTOR WITH AXIAL DISPERSION AND GAS-TO-SOLID HEAT AND MASS TRANSFER. NUMERICAL METHODS FOR STEADY STATE ANALYSIS

M. Kubicek
Department of Chemical Engineering and Computer Centre, Prague Institute of Chemical Technology, 166 28 Praha 6, Czechoslovakia

M. Holodniok
Department of Chemical Engineering and Computer Centre, Prague Institute of Chemical Technology, 166 28 Praha 6, Czechoslovakia

Abstract

Three dispersion models of a nonadiabatic catalytic tubular reactor are investigated: one-phase model and two two-phase models considering external gas-to-solid heat and mass transfer. In the second (more complex) two-phase model also heat conduction in the solid phase is considered. The transport equations of the one-phase model and of the simpler two-phase model were solved by a shooting method, which failed for the more complex two-phase model. Solution for this model was obtained by using a finite difference approach. Dependences of the solution on the Damkohler number were evaluated for all three models. For a strong exothermic reaction discontinuities of the profiles in the solid phase may be observed for the model without heat conduction in the solid phase. Introduction of heat conduction in the solid phase does not bring essential changes in the solution.

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