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3rd Thermal and Fluids Engineering Conference (TFEC)

ISSN: 2379-1748

THE INFLUENCE OF OPERATING PARAMETERS ON THE TEMPERATURE DISTRIBUTION IN FLIGHTED ROTARY DRUMS

Jakob Seidenbecher
Otto von Guericke University Magdeburg, Institute of Fluid Dynamics and Thermodynamics, Universitätsplatz 2, 39106 Magdeburg, Germany

Fabian Herz
Otto-von-Guericke-University Magdeburg, Institute of Fluid Dynamics and Thermodynamics, Universitätsplatz 2, 39106 Magdeburg, Germany; Anhalt University of Applied Sciences, Apartment of Applied Biosciences and Process Engineering, Bernburger Strasse 55, 06366 Köthen, Germany

Eckehard Specht
Otto von Guericke University Magdeburg, Institute of Fluid Dynamics and Thermodynamics, Universitätsplatz 2, 39106 Magdeburg, Germany

S. Wirtz
Ruhr-University Bochum, Institute of Energy Technology, Universitätsstraße 150, 44801 Bochum

A. Berndt
Ruhr-University Bochum, Institute of Energy Technology, Universitätsstraße 150, 44801 Bochum

V. Scherer
Ruhr-University Bochum, Institute of Energy Technology, Universitätsstraße 150, 44801 Bochum

DOI: 10.1615/TFEC2018.tfh.020944
pages 1261-1270


KEY WORDS: Rotary drum, Flights, Heat transfer, Particles, Design parameters, Temperature distribution, Operating parameters

Abstract

Rotary drums are used in many industrial applications for heat and mass transfer between gas and solid particles. Additional flights are installed to improve the mixing of adhesive products and especially to increase the exchange surface between gas and solids. The flights are mounted on the inside of the drum and lift particles out of the solid bed to shower them as curtains in the passing gas phase of the drum, where heat and mass transfer is very intense. The amount of particles and their distribution are influenced by operating parameters (rotational speed, filling degree, air volume flow), which were researched in a previous study about transverse particle motion. In order to couple the transverse particle motion to the heat transfer, heat transfer experiments were carried out. Therefore, an indirectly heated flighted rotary drum was designed and constructed. Batch experiments, which were divided into heating and cooling process, with glass beads as reference material were performed. The temperature distribution inside the drum was measured using thermocouples at different axial and radial positions in the cylindrical drum. The operating parameters rotational speed, filling degree and air volume flow were varied to investigate their influence on the temperature distribution inside the drum. It was found that increasing the rotational speed as well as the air volume flow leads to faster changing temperatures. Meanwhile, increasing the filling degree results in slower temperature drop rates.

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