MAXIMIZATION OF THERMAL EFFICIENCY OF FLUIDIZED-BED HEAT REGENERATORS
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Abstract In this work, we develop a two-phase mathematical model that describes the dynamic behavior of fluidized-bed heat regenerators. This model is based upon the two-phase theory of fluidization and accounts for the major aspects of bubbling fluidized beds. The model is first employed to identify operating conditions necessary to attain a constant effluent gas temperature. The devised model is then used to characterize the major parameters which influence the thermal efficiency of regenerative fluidized beds during the regeneration and the working periods. The set of design and operating parameters which leads to an efficient operation is, therefore, identified and accounted for on theoretical grounds. The model results can be used to design efficient fluid-bed heat regenerators or to improve the efficiency of existing units.
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