Optimum Design Approach for Gas Fluidized Beds

Abstract

The design of a gas fluidized bed reactor depends on the choice of operating parameters, reaction type, geometry of the reactor, gas distributors etc. The hydrodynamics of a fluid-bed is largely affected by the distributor because the gas bubble induced mixing is influenced by the distribution system and its design. The reactor size has to be fixed based on hydrodynamics as well as the desired conversion level. It is often difficult in practice to choose the operating parameters to satisfy both these conditions. Hence in this paper an analysis is presented as how to fix the operating parameters taking into account various conditions such as bubble coalescence, dead zone of solids near distributor, preserving a specified bubble size inside the reactor and control of gas jetting condition near grid zone. The criteria for fixing the operating velocity, selecting the distributor design parameters and fixing the reactor height arc presented.