Circulating Bed Reactors (CBR) have great potential in chemical engineering, but the current range of applications is still quite limited. One of the main obstacles on the expansion of the CBR technology is the scale-up that requires large scale experiments. The availability of simulation models allows to predict the highly complex fluid dynamics could therefore support implementation of CBR. In this work, the Computational Fluid Dynamic (CFD) commercial model FLUENT has been used to fit experimental data recorded in an experimental set up. Boundary and initial conditions set for the model reproduce the experimental CFB arrangement (including design details), gas transport parameters and operating data, i.e. gas and solid rates. Two interpenetrating continuous phases (solid-glass beads, mono dimensional particle size- and gas - ambient air-) have been set in a three-dimensional Eulerian-Eulerian model. A k- multiphase turbulence model with dispersed flow has been used. For drag evaluation, Gidaspow model and granular temperature model have been applied. High gas and solid rates have been imposed, in order to have high solid concentration and relevant solid to solid interactions. Experimental and simulation data have been compared at gas velocity of 20 m.s-1 and of solid mass flux 260, 330 and 400 kg.m-2.s-1. Experimental and simulated pressure data as a function of time have been compared and discussed.

Simulation of High Density Circulating Bed Reactor

SESTI OSSEO, Libero
2008-01-01

Abstract

Circulating Bed Reactors (CBR) have great potential in chemical engineering, but the current range of applications is still quite limited. One of the main obstacles on the expansion of the CBR technology is the scale-up that requires large scale experiments. The availability of simulation models allows to predict the highly complex fluid dynamics could therefore support implementation of CBR. In this work, the Computational Fluid Dynamic (CFD) commercial model FLUENT has been used to fit experimental data recorded in an experimental set up. Boundary and initial conditions set for the model reproduce the experimental CFB arrangement (including design details), gas transport parameters and operating data, i.e. gas and solid rates. Two interpenetrating continuous phases (solid-glass beads, mono dimensional particle size- and gas - ambient air-) have been set in a three-dimensional Eulerian-Eulerian model. A k- multiphase turbulence model with dispersed flow has been used. For drag evaluation, Gidaspow model and granular temperature model have been applied. High gas and solid rates have been imposed, in order to have high solid concentration and relevant solid to solid interactions. Experimental and simulation data have been compared at gas velocity of 20 m.s-1 and of solid mass flux 260, 330 and 400 kg.m-2.s-1. Experimental and simulated pressure data as a function of time have been compared and discussed.
2008
9788888198132
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11386/1862001
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