Mercury Speciation in Coal-Fired Power Plant Flue Gas-Experimental Studies and Model Development

Vidic, Radisav ; Flora, Joseph ; Borguet, Eric

University of Pittsburgh

关键词: Combustion;    Chemical Reactions;    Activated Carbon;    01 Coal, Lignite, And Peat;    Oxidation;   

DOI  :  10.2172/1004940
RP-ID  :  None
RP-ID  :  FG26-05NT42534
RP-ID  :  1004940

美国|英语

来源: UNT Digital Library

【 摘 要 】

The overall goal of the project was to obtain a fundamental understanding of the catalytic reactions that are promoted by solid surfaces present in coal combustion systems and develop a mathematical model that described key phenomena responsible for the fate of mercury in coal-combustion systems. This objective was achieved by carefully combining laboratory studies under realistic process conditions using simulated flue gas with mathematical modeling efforts. Laboratory-scale studies were performed to understand the fundamental aspects of chemical reactions between flue gas constituents and solid surfaces present in the fly ash and their impact on mercury speciation. Process models were developed to account for heterogeneous reactions because of the presence of fly ash as well as the deliberate addition of particles to promote Hg oxidation and adsorption. Quantum modeling was used to obtain estimates of the kinetics of heterogeneous reactions. Based on the initial findings of this study, additional work was performed to ascertain the potential of using inexpensive inorganic sorbents to control mercury emissions from coal-fired power plants without adverse impact on the salability fly ash, which is one of the major drawbacks of current control technologies based on activated carbon.