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Main Title Equilibrium Speciation of As, Cd, Cr, Hg, Ni, Pb, and Se in Oxidative Thermal Conversion of Coal. A Comparison of Thermodynamic Packages.
Author Frandsen, F. ; Erickson, T. A. ; Kuhnel, V. ; Helble, J. J. ; Linak, W. P. ;
CORP Author Environmental Protection Agency, Research Triangle Park, NC. National Risk Management Research Lab. ;Technical Univ. of Denmark, Lyngby. Dept. of Chemical Engineering. ;North Dakota Univ., Grand Forks. Energy and Environmental Research Center. ;Connecticut Univ., Storrs. Dept. of Chemical Engineering.
Publisher 1996
Year Published 1996
Report Number EPA/600/A-96/112;
Stock Number PB97-122642
Additional Subjects Air pollution control ; Coal ; Thermodynamics ; Combustion ; Emission ; Flue gases ; Gas scrubbing ; Stationary sources ; Trace elements ; Pressurized Fluidized-bed Combustion(PFBC)
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
NTIS  PB97-122642 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 16p
The paper predicts the equilibrium speciation of the trace elements As, Cd, Cr, Hg, Ni, Pb, and Se in a model system, assuming ideal gas and pure condensed phases and taking into account the presence of a sorbent material for sulfur capture. The model system is based on a demonstration-scale pressurized fluidized-bed combustor, firing a Pittsburgh No. 8 bituminous coal, using dolomite as sorbent for sulfur capture and a ceramic filter for particulate removal. Results from four different thermodynamic packages (MINGYSYS, NASA-CET89, FACT, and SOLGASMIX) are compared over the temperature range 700-2000 K, at pressures of 1 and 20 atm. For As, Hg, and Se, almost identical equilibrium distributions were predicted by the four packages were observed. These differences may be due to different solution techniques, convergence criteria, and/or thermodynamic packages.