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ES OF COAL NITROGEN RELEASE CHEMISTRY FOR OXYFUEL COMBUSTION AND CHEMICAL ADDITIVES



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STUDIES OF COAL NITROGEN RELEASE CHEMISTRY FOR OXYFUEL COMBUSTION AND CHEMICAL ADDITIVES by John M Sowa A thesis submitted to the faculty of Brigham Young University in partial fulfillment of the requirements for the degree of Master of Science Department of Chemical Engineering Brigham Young University December 2009 ABSTRACT STUDIES OF COAL NITROGEN RELEASE CHEMISTRY FOR OXYFUEL COMBUSTION AND CHEMICAL ADDITIVES John M Sowa Department of Chemical Engineering Master of Science Pollution is one of the greatest concerns with pulverized coal combustion With tightening standards on pollution emissions more information is needed to create better design models Burner modifications are the most efficient changes that can be made to assure sufficient carbon burnout and low NOx emissions Experiments were performed in the BYU Flat Flame Burner FFB lab operating under fuel rich conditions for pyrolysis experiments and fuel lean conditions for char oxidation experiments Effects of temperature coal rank residence time and post flame oxygen content on mass release nitrogen release and reactivity were examined Elemental and Inductively coupled plasma ICP analyses were used to determine the mass and nitrogen release of coals and chars FT IR was used to determine gas phase nitrogen compositions on selected experiments Results of char oxidation experiments were fit to a first order model to obtain an Arrhenius pre exponential factor while activation energies were approximated using a published correlation CPD model calculations were used to find experimental residence times and particle diameters that obtained full pyrolysis yields Oxy fuel experiments were performed by switching the burner diluent gas from N2 to CO2 Oxy fuel experiments exhibited a rank effect in nitrogen release Bituminous coal tests showed no statistically significant difference in mass or nitrogen release between the two conditions A sub bituminous coal exhibited a greater mass and nitrogen release for the same



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