Degree Type

Dissertation

Date of Award

2002

Degree Name

Doctor of Philosophy

Department

Chemical and Biological Engineering

First Advisor

Robert C. Brown

Abstract

Mercury emissions from coal-fired power plants pose impact on human health. The emissions will be regulated in the near future. Mercury speciation in flue gas has an important effect on the efficiency of mercury emission control devices. This study focuses on the role of fly ash on the oxidation of Hg 0 in bench-scale simulated flue gas environment and in laboratory-scale coal combustion flue gas environment. The effects of flue gas matrices, temperature, fly ash mineralogy and morphology on the oxidation of Hg0 are studied. Conclusions are drawn based on the testing results: (1) Mercury chemistry is very complex in flue gas. (2) The presence of fly ash is critical for heterogeneous Hg0 oxidation. (3) The flue gas components, including NO2, HCl, NO and SO2, have strong effects on the potential of whole fly ashes to oxidize Hg0. (4) Fly ash specific surface area appears to have a determining effect on Hg0 heterogeneous oxidation.

DOI

https://doi.org/10.31274/rtd-180813-12052

Publisher

Digital Repository @ Iowa State University, http://lib.dr.iastate.edu

Copyright Owner

Hongqun Yang

Language

en

Proquest ID

AAI3061876

File Format

application/pdf

File Size

69 pages

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