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Dielectric Properties of Various Ranks of Coal and Numerical Modeling Under Electromagnetic Irradiation

Published online by Cambridge University Press:  28 February 2011

I. Chatterjee  and
M. Misra
I. Chatterjee
Affiliation:
Department of Electrical Engineering/Computer Science, University of Nevada, 89557 Reno, Nevada
M. Misra
Affiliation:
Department of Chemical and Metallurgical Engineering, University of Nevada, 89557 Reno, Nevada
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Abstract

The dielectric properties of different ranks of Argonne Premium coal samples have been measured using an automated network analyzer system in the frequency range 0.3MHz to 3GHz. These measurements indicate that the inherent moisture present in the various ranks ofcoal has dielectric properties which are different from that of free water. The dielectric properties were also observed to increase with the moisture content as well as with the amount of oxygen present in the coal sample. A mixture model was successfully used topredict these dielectric properties.

The measured dielectric properties have been incorporated into numerical calculations ofthe distribution of absorbed energy in coal irradiated with electromagnetic waves. The numerical technique used is the Method of Moments. Subsequently, the temperature distribution obtained in the coal is evaluated using a Finite Difference technique to solve the heat conduction equation. These calculations should prove very useful in the microwave drying of coal where it is difficult to monitor the temperature using probes.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 189: Symposium L – Microwave Processing of Materials II , 1990 , 195
Copyright
Copyright © Materials Research Society 1991

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References

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