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Show CONCLUSIONS AND SIGNIFICANCE The combustion of coal leads to the formation of potentially corrosive liquid silicates and sulfates. The imposition of an expected kinetic constraint extends the range of stability of the corrosive sulfate phase. The tendency of the liquid sulfates to form on the surfaces of particulates should enhance agglomeration and fouling. In order to further define the significant nonequilibrium effects, it is important to couple calculations such as these with an experimental program. The results of such studies can lead to the ability to predict the total chemistry of coal combustion for any coal and any set of operating conditions. One can thus greatly minimize the number of measurements needed to understand the chemistry of agglomeration, fouling, and corrosion and to deduce strategies for reducing deleterious effects brought on by coal combustion condensates. ACKNOWLEDGMENTS Prior work, on the silicate model used, was supported by the Morgantown Energy Technology Center. This work was supported by the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences, under Contract No. W-31-109-ENG- 38. REFERENCES 1. S. Sinha, K. Natesan, and M. Blander, A New Calculational Method for Deducing the Complex Chemistry of Coal Ash Deposits, Proceedings of the Conference on Mineral Matter and Ash Deposition from Coal, Santa Barbara, California, February 21-26, 1988, In press. 2. G. Eriksson, Chemica Scripta 8, 100 (1975). 3. M. Blander and A. D. Pelton, Computer-Assisted Analyses of the Thermodynamic Properties of Slags in Coal Combustion Systems, ANL/FE-8S-19, Argonne National Laboratory, Argonne, IL 6043. 4. M. Blander and A. D. Pelton, Analyses and Predictions of the Thermodynamic Properties of Multicomponent Silicates, Proc. of the Second Int. Symposium on Metallurgical Slags and Fluxes, H. A. Fine and D. R. Gaskell (Eds.), TMS-AIME, Warrendale, PA, pp. 295-304. 5. A. Pelton and M. Blander, Computer Assisted Analyses of the Thermodynamic Properties and Phase Diagrams of Slags, Proc. of Second Int. Symposium on Metallurgical Slags and Fluxes, H. A. Fine and D. R. Gaskell (Eds.), TMS-AIME, Warrendale, PA, pp. 281-294. 6. A. D. Pelton and M. Blander, Metall. Trans. 17B, 805 (1986). 7. M. Blander and A. D. Pelton, Geochim. Cosmochim. Act. 51,85 (1987). 8. A. D. Pelton, G. Eriksson, and M. Blander, A Quasichemical Model for the Thermodynamic Properties of MuIticomponent Slags, Proceedings of the Third Int. Conference on Molten Slags and Fluxes, University of Strathclyde, Glasgow, Scotland, June 27-29, 1988, in press. 9. R. G. Reddy and M. Blander, Metail. Trans. B 18.B, 591 (1987). 4 |