Maximizing power efficiency in gas-solid-liquid stirred vessels handling high solids concentrations

Davoody, M, Bin Abdul Raman, A and Parthasarathy, R 2015, 'Maximizing power efficiency in gas-solid-liquid stirred vessels handling high solids concentrations', in Asia Pacific Confederation of Chemical Engineering Congress 2015: APCChE 2015, incorporating CHEMECA 2015, Melbourne, Australia, 27 September - 1 October 2015, pp. 1510-1521.


Document type: Conference Paper
Collection: Conference Papers

Title Maximizing power efficiency in gas-solid-liquid stirred vessels handling high solids concentrations
Author(s) Davoody, M
Bin Abdul Raman, A
Parthasarathy, R
Year 2015
Conference name Asia Pacific Confederation of Chemical Engineering Congress 2015: APCChE 2015, incorporating CHEMECA 2015
Conference location Melbourne, Australia
Conference dates 27 September - 1 October 2015
Proceedings title Asia Pacific Confederation of Chemical Engineering Congress 2015: APCChE 2015, incorporating CHEMECA 2015
Publisher Engineers Australia
Place of publication Melbourne, Australia
Start page 1510
End page 1521
Total pages 12
Abstract This study focuses on determining the optimum operating and geometrical conditions that will enhance the agitator energy efficiency in a gas-liquid-solid agitated vessel. A term defined as the power efficiency factor (epsilon jsg -1 (kg/W)) served as an indication of the quantity of solid particles that could be suspended per unit of power consumed by the impeller. By varying operational parameters like solids concentration and gas flow rate and design parameters like impeller type and baffling condition, it was found that the epsilon jsg -1 values can be maximized by operating the tank with an optimum range of solids concentration, which is around Cv = 0.2 - 0.3 v/v for the systems studied in this work. Another term, known as baffling efficiency factor, 'R epsilon', was used to study how baffle removal influences the energy efficiency of impellers in three-phase systems. It was observed that absence of baffles could exert negative effects on energy efficiency of axial-flow impellers at particular operating conditions. Moreover, the gas-liquid interfacial area 'ɑ' was studied by determining the gas holdup and Sauter mean bubble diameter (d32) at 'just-suspended condition' Njsg, for a wide range of solids concentrations. It was observed that increasing solids concentration is an effective strategy for maximization of contact area between gas and liquid phases in three-phase stirred tanks.
Subjects Chemical Engineering Design
Keyword(s) process intensification
three-phase systems
stirred vessels
optimization
energy
bubble size
interfacial area
ISBN 9781922107473
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