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.
Highlights
In the framework of a collaborative project between IHM from KIT and IEC from TU Bergakademie Freiberg for microwave heating of lignite briquettes, a 10 kW compact applicator operating at 2.45 GHz has been successfully designed and tested
The temperature field inside the lignite material and ceramic is shown in Fig. 6 after one hour of continuous running with briquettes moving from bottom to top with an average velocity of 2.5 cm/s which correspond to 75 briquettes per minute
Lignite briquettes were moving at various speed between 50 to 75 briquettes ther the lignite coal material behaviour under fast microwave heating
Summary
In the framework of a collaborative project between IHM from KIT and IEC from TU Bergakademie Freiberg for microwave heating of lignite briquettes, a 10 kW compact applicator operating at 2.45 GHz has been successfully designed and tested This applicator delivers volumetric heating to the briquettes which are moving inside a microwave transparent ceramic silicon nitride tube with high mechanical strength. Upstream to this applicator, briquettes are produced from the lignite coal powder with a briquetting press machine Rosin et al (2014).
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