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Development of a 10 kW microwave applicator for thermal cracking of lignite briquettes

Lepers, B. 1; Seitz, T. 1; Link, G. 1; Jelonnek, J. 1; Zink, M.
1 Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM), Karlsruher Institut für Technologie (KIT)


A compact 10 kW microwave applicator operating at 2:45 GHz for fast volumetric heating and thermal cracking of lignite briquettes has been successfully designed and tested. In this paper, the applicator design and construction are presented together with a sequentially coupled electromagnetic, thermal-fluid and mechanical Comsol model. In a first step, this model allows us to calculate the power density inside the lignite material and the temperature distribution in the applicator for different water flow rates. In a second step, the total stress due to the thermal dilatation, the internal pressure inside the ceramic and the contact pressure from the seals at both ends of the ceramic can be computed. In addition, preliminary experimental results are given and showed a significant mechanical strength weakening of the briquettes with microwave heating.

Volltext §
DOI: 10.5445/IR/110103955
DOI: 10.5098/hmt.6.20
Zitationen: 2
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2015
Sprache Englisch
Identifikator ISSN: 2151-8629
KITopen-ID: 110103955
HGF-Programm 34.12.01 (POF III, LK 01) Multiphasen und thermische Prozesse
Erschienen in Frontiers in heat and mass transfer
Verlag Global Digital Central
Band 6
Heft 20
Seiten 1-6
Schlagwörter Microwave applicator, microwave heating, thermo elastic model, silicon nitride, lignite, thermal cracking
Nachgewiesen in Dimensions
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