ISU Electrical and Computer Engineering Archives

Characterization of unburned carbon content in coal fly ash with dielectric constant measurement

Chan, King-Sang (2004) Characterization of unburned carbon content in coal fly ash with dielectric constant measurement. Masters thesis, Iowa State University.

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Abstract

The research was to investigate the relationship between dielectric constant of fly ash and unburned carbon content in fly ash. Dielectric constant is a factor measures the ratio of the permittivity of dielectric material to the permittivity of free space (8.85 x 10-12 F/m). It describes the extent to which dielectric material interacts with electric flux. The dielectric constant of fly ash can be extracted from phase measurement with using a network analyzer and a fixture based on coaxial transmission line design. Unburned carbon in fly ash is a major index to determine the efficiency of coal combustion in a power plant. Loss-on-ignition (LOI) technique and thermogravimetric analysis (TGA) are among techniques being used in the industrial to determine unburned carbon content in fly ash. Measuring dielectric constant of fly ash approach is promising as an alternative non-destructive way to determine the amount of unburned carbon in fly ash. The Clausius-Mossotti relation is used to determine fly ash properties with available of dielectric constant and therefore determine the unburned carbon content. Initial experiment shows the unburned carbon content estimated from dielectric constant measurement correlates closely to the unburned carbon content measured with the LOI technique.

EPrint Type:Thesis (Masters)
Uncontrolled Keywords:Fly Ash, dielectric constant, Loss-on-ignition, Clausius-Mossotti relation
Subjects:Electrical Engineering > ELECTROMAGNETICS & NONDESTRUCTIVE EVALUATION > Nondestructive Testing
ID Code:82
Identification Number:Identification Number UNSPECIFIED
Deposited By:Mr. King-Sang Chan
Deposited On:17 July 2004

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