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Original title:
Mathematical Modeling of Heat and Mass Transfer in a Rotary Kiln
Authors: Kozakovič, M. ; Čada, J. ; Kokavcová, A. ; Havlica, Jaromír ; Huchet, F.
Document type: Papers
Conference/Event: mezinárodní chemicko-technologická konference /9./, Mikulov (CZ), 20220425
Year: 2022
Language: eng
Abstract: The main objective of this research was to compare the results of the proposed 1D transport model with numerical simulations of mass transport in a direct-heat rotary kiln at laboratory scale. Another objective was to investigate the effect of the number of flights on the formation of an active particle surface in the airborne phase, which enables efficient heat transport. The studied rotary kiln is a low-angle cylinder with a length of 0.5 meter and a diameter of 0.108 meter with regularly arranged flights on the inside. The heat is transported into the rotary kiln by hot air at the inlet. The load in the rotary kiln consists of spherical particles with 1 millimeter diameter. The rotary kiln rotation speed is 21.5 rpm. For each simulation, 20 rotations were performed. The Discrete Element Method implemented in an open-source code LIGGGHTS was used for simulations.Efficient heat transfer is made possible primarily by the large number of particles in the airborne phase, which are heated by the warm air blowing in. To begin with, the number of flights and their geometry were found to be a key parameter controlling the amount of particles in the gaseous regime. It was also found that an area in the right part of the base of the cylinder is formed which is not reached by particles from the flights. This phenomenon is due to the dynamics of particle transport, as the particles are not maintained in the active phase and move rapidly towards the load due to gravity. In conclusion, the effect of this zone is negative, as hot air flows through it without resistance, preventing the system from heating effectively.
Keywords: discrete element method; granular dynamics; particulates system; rotary kiln
Project no.: StrategieAV21/20
Funding provider: AV ČR
Host item entry: Proceedings, ISBN 978-80-88307-11-2
Rights: This work is protected under the Copyright Act No. 121/2000 Coll.
Institution: Institute of Chemical Process Fundamentals AS ČR (web)
External URL: https://www.icct.cz/en/Amca-ICCT/media/content/2022/proceedings/ICCT2022-Proceedings.pdf
Original record: https://hdl.handle.net/11104/0339172
Permalink: http://www.nusl.cz/ntk/nusl-520552
The record appears in these collections:
Research > Institutes ASCR > Institute of Chemical Process Fundamentals
Conference materials > Papers
Authors: Kozakovič, M. ; Čada, J. ; Kokavcová, A. ; Havlica, Jaromír ; Huchet, F.
Document type: Papers
Conference/Event: mezinárodní chemicko-technologická konference /9./, Mikulov (CZ), 20220425
Year: 2022
Language: eng
Abstract: The main objective of this research was to compare the results of the proposed 1D transport model with numerical simulations of mass transport in a direct-heat rotary kiln at laboratory scale. Another objective was to investigate the effect of the number of flights on the formation of an active particle surface in the airborne phase, which enables efficient heat transport. The studied rotary kiln is a low-angle cylinder with a length of 0.5 meter and a diameter of 0.108 meter with regularly arranged flights on the inside. The heat is transported into the rotary kiln by hot air at the inlet. The load in the rotary kiln consists of spherical particles with 1 millimeter diameter. The rotary kiln rotation speed is 21.5 rpm. For each simulation, 20 rotations were performed. The Discrete Element Method implemented in an open-source code LIGGGHTS was used for simulations.Efficient heat transfer is made possible primarily by the large number of particles in the airborne phase, which are heated by the warm air blowing in. To begin with, the number of flights and their geometry were found to be a key parameter controlling the amount of particles in the gaseous regime. It was also found that an area in the right part of the base of the cylinder is formed which is not reached by particles from the flights. This phenomenon is due to the dynamics of particle transport, as the particles are not maintained in the active phase and move rapidly towards the load due to gravity. In conclusion, the effect of this zone is negative, as hot air flows through it without resistance, preventing the system from heating effectively.
Keywords: discrete element method; granular dynamics; particulates system; rotary kiln
Project no.: StrategieAV21/20
Funding provider: AV ČR
Host item entry: Proceedings, ISBN 978-80-88307-11-2
Rights: This work is protected under the Copyright Act No. 121/2000 Coll.
Institution: Institute of Chemical Process Fundamentals AS ČR (web)
External URL: https://www.icct.cz/en/Amca-ICCT/media/content/2022/proceedings/ICCT2022-Proceedings.pdf
Original record: https://hdl.handle.net/11104/0339172
Permalink: http://www.nusl.cz/ntk/nusl-520552
The record appears in these collections:
Research > Institutes ASCR > Institute of Chemical Process Fundamentals
Conference materials > Papers
Record created 2023-02-12, last modified 2023-12-11
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