Ohantze iturrituetako gas emariaren egoitza denbora kalkulatzeko eredua

Resumen

The aim of this paper is the developement of a model for gas distribution in spouted beds, which is based on the Ergun equation for pressure calculation. For that purpose, the streamtubes followed by the gas have been defined. The gas is distributed from the spout into the annulus according to these streamtubes. Given that pressure drop at any level in the bed (in the spout) is calculated from previously developed correlations, the amount of gas that enters each streamtube is that corresponding to this known pressure drop, and is calculated by means of Ergun equation. Although this is a much simpler model than those already published in the literature, it predicts fairly well the experimental values of gas velocity in the spout obtained by a Pitot tube and the values of residence time distribution in the annulus obtained by stimulus-response techniques in a pilot plant unit. A statistical analysis has been carried out to the mean values of residence time obtained using the model and the more influencial variables are shape factor and particle size (both solid properties), which means that particle characteristics have a greater influence than the geometry of the contactor itself.