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AXIAL SOLID TRANSPORT IN ROTARY KILNS − INFLUENCE OF OPERATIONAL PARAMETERS

Haozhi Jie
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

DOI: 10.1615/TFEC2018.tff.020961
pages 1825-1834


键词 Rotary kiln, dynamic model, particle movement, transient behavior

摘要

Rotary kilns are widely used as industrial equipment for the thermal processing of different bulk bed systems such as calcination, sintering and pyrolysis. Granular bed motion analysis will be used to improve the research of heat and mass transfer inside rotary kilns. A technical scale rotary kiln with 5 m length and 0.4 m inner diameter was used to study the transient behavior of the axial bulk bed profile. A new experimental method was introduced to continuously measure bed depth during the transient process using image analysis methods. Quartz sand was used as test material and the parameters of interest were the rotational speed and the inclination angle of the kiln. During the experiments, the discharge mass flow rates, bed depth profiles and stationary time were measured continuously. These experimental results are used to validate a theoretical dynamic model for bed depth profile simulations. So the local heat transfer surface of the free and covered bulk bed can be described over the total length of the kiln, which is important for the analysis of processes in rotary kilns.

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