Sensitivity analysis on the microwave heating of coal: a coupled electromagnetic and heat transfer model

Lin, Baiquan , Li, He , Chen, Zhongwei , Zheng, Chunshan , Hong, Yidu and Wang, Zheng (2017) Sensitivity analysis on the microwave heating of coal: a coupled electromagnetic and heat transfer model. Applied Thermal Engineering, 126 949-962. doi:10.1016/j.applthermaleng.2017.08.012


Author Lin, Baiquan
Li, He
Chen, Zhongwei
Zheng, Chunshan
Hong, Yidu
Wang, Zheng
Title Sensitivity analysis on the microwave heating of coal: a coupled electromagnetic and heat transfer model
Journal name Applied Thermal Engineering   Check publisher's open access policy
ISSN 1359-4311
1873-5606
Publication date 2017-08-03
Sub-type Article (original research)
DOI 10.1016/j.applthermaleng.2017.08.012
Open Access Status Not yet assessed
Volume 126
Start page 949
End page 962
Total pages 14
Place of publication Oxford United Kingdom
Publisher Pergamon Press
Language eng
Abstract Microwave irradiation has gained widespread popularity in coal processing. However, the effects of microwave parameters and coal properties on the heating behavior remain much less explored. In this study, a coupled electromagnetic and heat transfer model was developed to investigate the microwave-coal interactions. Results show that microwave heating is sensitive to frequency: an optimal frequency of 2.45 GHz was found whereby the maximum temperature and energy efficiency can be achieved. In addition, the increase in the microwave power contributes to the thermal heterogeneity and energy consumption, suggesting that low powers are suitable for uniform heating and energy saving, while high powers apply to differential and rapid heating. As the loss factor increases, the temperature and energy efficiency increase while the thermal heterogeneity decreases. Increasing the loss factor could not only achieve rapid and uniform heating but also save energy. Furthermore, the optimal coal size for enhancing microwave energy absorption could be obtained when the coal diameter is 50 mm, with heights ranging from 60 mm to 100 mm. Outcomes of this study can be used to identify the electric and thermal fields of coal and thereby help to optimize the microwave applicators.
Keyword Microwave heating
Coal permittivity
Electric field
Thermal field
Frequency and power
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Mechanical & Mining Engineering Publications
Not Yet Publicly Available
 
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Created: Mon, 07 Aug 2017, 14:48:54 EST by Zhongwei Chen on behalf of School of Mechanical and Mining Engineering