期刊
CHEMICAL ENGINEERING & TECHNOLOGY
卷 39, 期 3, 页码 425-434出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ceat.201500347
关键词
Filter aids; Flux limiter; Mathematical model; Moving boundary problem; Precoat filtration
A new mechanistic model for filter-aid filtration with incompressible cakes is presented. Surface-and depth-filtration effects are considered based on a continuum mechanics approach. This leads to a moving boundary problem with sharp moving fronts. Proper mathematical and numerical methods for its solution are identified which allow fully transient simulations concerning all process variables and parameters. All relevant physical phenomena known from experimental studies are captured by the model, some of them for the first time. In two case studies, the effects of changing the filter-aid particle diameter at a discrete time point and continuously varying the amount of filter aid with time are considered. Significant influences on the separation efficiency, the local deposit profile within the filter cake, and the overall pressure drop are found.
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