Dynamic simulation of compressible sediments in decanter centrifuges

M. GleiƟ*, H. Nirschl, Karlsruhe Institute of Technology (KIT), Germany

Decanter centrifuges are continuous machines for the separation of dispersed solids from a continuous liquid phase. The variable design of the continuous centrifuge permits the use in different industries. Examples are the chemical and pharmaceutical industry, the minerals processing, the wastewater treatment or the biotechnology. The design of centrifuges is based on simplified empirical models. So there are large deviations by comparing experimental results with the theoretical calculations. More complex models for the design of decanter centrifuges show a better accuracy by linking the process conditions with the material properties of the solid-liquid mixture [1] [2]. Here, the material properties, such as settling behaviour and sediment build-up, are measured in well-established laboratory equipment

This work presents a dynamic process model for decanter centrifuges which can handle incompressible and compressible sediments. The new dynamic approach has a number of advantages. In comparison to other models, the numerical algorithm is highly efficient in time, while handling system inherent dynamic changes in e.g. feed properties. Initially, we discuss the mathematical formulation of the dynamic process model. Experimental results for the dewatering and separation efficiency validate the new dynamic process model. The experimental and numerical investigations were performed with a lab-scale decanter centrifuge...

Session: L2 - Decanter Centrifuges
Day: 13 March 2018
Time: 14:45 - 16:00 h

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