Název: Mathematical Modeling of Heat and Mass Transfer in a Rotary Kiln
Autoři: Kozakovič, M. ; Čada, J. ; Kokavcová, A. ; Havlica, Jaromír ; Huchet, F.
Typ dokumentu: Příspěvky z konference
Konference/Akce: mezinárodní chemicko-technologická konference /9./, Mikulov (CZ), 20220425
Rok: 2022
Jazyk: eng
Abstrakt: 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.
Klíčová slova: discrete element method; granular dynamics; particulates system; rotary kiln
Číslo projektu: StrategieAV21/20
Poskytovatel projektu: AV ČR
Zdrojový dokument: Proceedings, ISBN 978-80-88307-11-2
Práva: Dílo je chráněno podle autorského zákona č. 121/2000 Sb.

Instituce: Ústav chemických procesů AV ČR (web)
Externí umístění souboru: https://www.icct.cz/en/Amca-ICCT/media/content/2022/proceedings/ICCT2022-Proceedings.pdf
Původní záznam: https://hdl.handle.net/11104/0339172

Trvalý odkaz NUŠL: http://www.nusl.cz/ntk/nusl-520552


Záznam je zařazen do těchto sbírek:
Věda a výzkum > AV ČR > Ústav chemických procesů
Konferenční materiály > Příspěvky z konference