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Phase Characterization of Coal-Fueled Turbine Engine Deposits

  • Paul J. Schields (a1), Clifford L. Spiro (a1) and Edward F. Koch (a1)


A major consideration in the development of a coal-fueled turbine engine is to minimize the deleterious effect of products of combustion (POC) on the engine components. Characterization of the POC phases is important for understanding and regulating combustion, emissions, deposition, corrosion and erosion behavior. POC phases deposited from the combustion of beneficiated bituminous coal in turbine simulators were characterized using x-ray techniques and electron microscopy. The phase assemblages include plagioclase feldspars, feldspathoids, spinels, anhydrite, hematite and noncrystalline material. The deposits had the form of a partially sintered powder and a slag. Differences in the phase composition of the powder and slag were determined by xray analysis and observed in the feldspar/spinel lattice parameters. The morphology, phase associations, compositional differences of the powder and slag, and heat treatment experiments indicate that the slag is largely formed by fusion of the powder. The hypothetical fusion process decomposes the CaSO4 in the powder and the released calcia is incorporated into the plagioclase solid solution powder phase. The additional alumina required for charge neutrality in the plagioclase comes from the powder's Al-rich spinel which transforms to an Al-poor spinel. These phase characterization results are useful for assessing and optimizing deposit remediation methods.


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1. Proceedings of the Conference on Coal-Burning Turbines, McGill University, Department of Mines and Technical Surveys, Ottawa, Nov. 22–23, 1956.
2. The Coal-Burning Gas Turbine Proiect, Report of the Interdepartmental Steering Committee, Department of Minerals and Energy, Department of Supply in Australia, Australian Government Publishing Service, 1973.
3. Kimura, S.G.. and Spiro, C.L., GE CRD Final Report, DOE/MC/22164-2188, Dec., 1986.
4. Kimura, S.G. and Spiro, C.L., GE CRD Final Report, Vol. II, DOE/MC/21395-2298, March, 1987.
5. Keller, D.V., Fifth Syrm. on Coal Slurry for Combustion Tech., Tampa, FL, April 1983, DOE, Pittsburgh, PA, 269 (1983).
6. Streeter, R.C., BCR National Laboratory, Quarterly Progress Report, DOE/MC/62690.
7. Bhasin, A.K. et. al., DOE Report, DOE/MC/2700-1635, Aug. 1984.
8. Spiro, C.L., Chen, C.C., Wong, J., Kimura, S.G. and Greegor, R.B., Fuel, 66, 563 (1987).
9. Goehner, R.P., Advances in X-ray Analysis, 23, 305311, (1980).
10. Garbauskas, M.F. and Goehner, R.P., GE CRD Technical Information Series Report, No. 82CRD297, 1982.
11. Kroll, H. and Ribbe, P.H., Am. Min., 65, 449 (1980).
12. Heaton, L., Argonne National Laboratory Report ANL-6176, 1961.
13. Kisch, H.J., Am. Min., 50, 1015 (1965).
14. Gibb, W.H., J. Inst. Energy, 59:441, 206, (1986).
15. Hemmings, R.T. and Berry, E.E., in Fly Ash and Coal Conversion By-Products: Characterization. Utilization and Disposal II, edited by McCarthy, G.J., Glasser, F.P. and Roy, D.M., Mat. Res. Soc. Symp. Proc. Vol.65 (Materials Research Society, Pittsburg, PA 1986), pp. 91104.

Phase Characterization of Coal-Fueled Turbine Engine Deposits

  • Paul J. Schields (a1), Clifford L. Spiro (a1) and Edward F. Koch (a1)


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