Gravity Separation of Particulate Solids in Turbulent Fluid Flow |
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Authors: | JÜRGEN TOMAS |
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Affiliation: | Mechanical Process Engineering , Magdeburg, Magdeburg, Germany |
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Abstract: | The separation characteristics of particles’ settling velocity, size, density, and shape are introduced, and the equivalent settling condition for laminar, transition, and turbulent flow are explained. A similarity model of particle transport in a turbulent flow field is briefly discussed. Typical operation principles in separation devices for counter current and cross-flow separation are presented. The separation function, cut point, sharpness, and separation stage utilization coefficient are determined to assess the efficiency for process sequences for multistage turbulent cross-flow separation. Satisfactory to very good results were achieved in the difficult separation of a partially liberated aggregate consisting of hardened cement paste rubble with sharpness from 0.66 to 0.94 at separation stage utilization coefficients of 7 to 87%. Specific mass flow rates of 3 to 16 t/(m2 · h) and mass related energy consumption of 0.2 to 8 kWh/t were obtained. |
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Keywords: | Cross-flow gravity separation model separation efficiency waste recycling |
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