Filtration of gases in fluidised beds.

The following review concentrates on the fundamental processes occurring in fluidised filters. Section II gives a brief summary of filtration in fixed granular beds, to define terms and concepts used in analysis of fluidised filtration. Attention is restricted to 'stationary' filtration, in which the collection medium is the granular material itself, without discussing 'non-stationary' effects caused by structural changes resulting from dust accumulation within the filter. Section III sets out an analysis of filtration in a fluidised bed, derived from conventional models of filtration in fixed beds and reaction in fluidised beds. The interpretation of available experimental results in terms of this model is summarised in Section IV. Section V reviews two variations which have been proposed on a simple configuration of: electrofluidised filters, and rotating fluidised beds. Actual and potential applications of the technique are discussed very briefly in Section VI. (from paper