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URN: urn:nbn:de:swb:90-AAA1101039557

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

Lepers, B.; Seitz, T.; Link, G.; Jelonnek, J.; Zink, M.

Abstract:
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.


Zugehörige Institution(en) am KIT Institut für Hochleistungsimpuls- und Mikrowellentechnik (IHM)
Publikationstyp Zeitschriftenaufsatz
Jahr 2015
Sprache Englisch
Identifikator ISSN: 2151-8629
KITopen ID: 110103955
HGF-Programm 34.12.01; LK 01
Erschienen in Frontiers in heat and mass transfer
Band 6
Heft 20
Seiten 1-6
Schlagworte Microwave applicator, microwave heating, thermo elastic model, silicon nitride, lignite, thermal cracking
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