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Objective

By Andrew Fry, Joann S. Lighty (pi, Geoffrey D. Silcox (co-pi and Joseph Helble

Abstract

On March 15, 2005, EPA announced the final regulations for mercury emissions from coal-fired power plants. The regulations embrace a cap-and-trade approach, which favors the use of combinations of existing air pollution control equipment (“co-benefits”). To effectively satisfy the new regulations and remove mercury from flue gas, an adequate fundamental understanding of the system chemistry is required. The objective of this project is to understand the importance of gas- and solid-phase constituents in mercury oxidation reaction chemistry. The effects of chlorine, nitrogen oxide, sulfur dioxide and ash particles on mercury oxidation are being studied. These oxidation reactions are believed to be important because oxidized mercury is effectively removed by wet flue gas desulfurization systems at no additional cost to plant operation. Accomplishments To Date At the University of Utah, the mercury analysis equipment, designed and constructed by Southern Research Institute, has been tested and proven to be effective. Mercury analysis has been performed on a 5 MMBtu/hr coal-fired boiler and mercury concentrations and speciation varied with changes in boiler operation as expected. Introduced mercury spikes were also recovered adequately. The mercury sampling and conditioning system were modified to analyze mercury during gas phase experimentation in a natural gas-fired, quartz-line, drop-tube furnace. Mercury mass balances were performed in the drop tube furnace and discrepancies between calculate

Year: 2004
OAI identifier: oai:CiteSeerX.psu:10.1.1.422.5512
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