Abstract
This paper deals with a geometric shape optimization of a fixed-bed reactor. The objective is to determine the shape of the packing that maximizes the reaction conversion rate subjected to the process model equations, operating constraints (iso-volume, energy dissipated by the fluid) and manufacturing constraints. The process model is described by the mass balance equations and Navier-Stokes equations. Incompressible fluid, a homogeneous first order reaction and steady-state conditions in the reactor are the main assumptions considered. The free software OpenFOAM is used as CFD solver. The optimization approach developed is based on the adjoint system method and the resulting algorithm is tested on a two-dimensional fixed-bed reactor in laminar flow regime. The results show a significant improvement of the conversion rate and the optimal shape obtained with the manufacturing constraints can be easily printed by means of an additive manufacturing technique.
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