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Impact of bed motion on the wall-to-bed heat transfer for powders in a rotary kiln and effect of built-ins

Moumin, Gkiokchan and Tescari, Stefania and Sattler, Christian (2021) Impact of bed motion on the wall-to-bed heat transfer for powders in a rotary kiln and effect of built-ins. International Journal of Heat and Mass Transfer, 177, p. 121473. Elsevier. doi: 10.1016/j.ijheatmasstransfer.2021.121473. ISSN 0017-9310.

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Official URL: https://www.sciencedirect.com/science/article/pii/S0017931021005767?via%3Dihub


This study analyses experimentally the heat transfer from the wall to the particle bed in a rotating drum with and without addition of built-ins for improving the mixing of the powder. Two types of materials were employed, sand as a granular material (dp,mean = 200 μm) and cement raw meal as a powdery material (dp,mean = 15 μm). A rotating cylinder heated through the outer shell was operated in batch mode, with rotational speeds of 1, 2 and 3 rpm and fillings of 5 and 10 %. The sand achieved a rolling motion, which makes the measured heat transfer coefficient predictable with theoretical models. At the contrary, cement raw meal showed very little mixing in a cylinder without built-ins and the measured heat transfer coefficient was much lower than the model predictions. Using longitudinal strips along the wall caused the powder to collapse regularly, increasing its heat transfer by a factor of 2–3, up to the range of predictions from theoretical models. Thus, a motion comparable to the rolling motion can be established with such built-ins which only cause limited dust formation. Furthermore, the limitations of the measurement method with rotating thermocouples are pointed out which mostly stem from the thermocouple response time and convectional losses, which are increased once built-ins are employed.

Item URL in elib:https://elib.dlr.de/145982/
Document Type:Article
Title:Impact of bed motion on the wall-to-bed heat transfer for powders in a rotary kiln and effect of built-ins
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Sattler, ChristianUNSPECIFIEDhttps://orcid.org/0000-0002-4314-1124UNSPECIFIED
Date:7 May 2021
Journal or Publication Title:International Journal of Heat and Mass Transfer
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:p. 121473
Keywords:Rotary kiln, Granular, Powder, Lifter, Rolling
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:Chemical Energy Carriers
DLR - Research area:Energy
DLR - Program:E SW - Solar and Wind Energy
DLR - Research theme (Project):E - Solar Fuels
Location: Köln-Porz
Institutes and Institutions:Institute of Future Fuels
Institute of Future Fuels > Solar-Chemical Process Development
Deposited By: Bülow, Mark
Deposited On:07 Jan 2022 11:44
Last Modified:28 Jun 2023 13:12

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