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Effect of Coal Constituents on the Liquid-Assisted Capture of Impacting Ash Particles in Direct Coal-Fired Gas Turbines FREE

[+] Author Affiliations
R. Nagarajan

West Virginia University, Morgantown, WV

R. J. Anderson

U.S. Dept. of Energy—Morgantown Energy Technology Center (DOE-METC), Morgantown, WV

Paper No. 88-GT-192, pp. V003T05A010; 9 pages
doi:10.1115/88-GT-192
From:
  • ASME 1988 International Gas Turbine and Aeroengine Congress and Exposition
  • Volume 3: Coal, Biomass and Alternative Fuels; Combustion and Fuels; Oil and Gas Applications; Cycle Innovations
  • Amsterdam, The Netherlands, June 6–9, 1988
  • Conference Sponsors: International Gas Turbine Institute
  • ISBN: 978-0-7918-7920-7
  • Copyright © 1988 by ASME

abstract

With the growing interest in burning pulverized coal directly in gas turbines, the problem of fouling — blockage of hot-gas pathways by thick ash deposits — is receiving increased attention. The inertial deposition rate of supermicron ash, which determines the fouling propensity of the coal via the thickness of the deposit, depends linearly on the sticking fraction of ash material arriving at the cooled surfaces, e.g., turbine blades and guide vanes. The magnitude and temperature-dependence of the sticking coefficient will depend on the inventory, composition and physicochemical properties of the liquid ‘glue’ consistent with the prevailing temperature, pressure and trace inorganic elemental compositions. As the deposit evolves in time, it encounters several deposition regimes in the order of increasing surface temperature, each characterized by a different source of liquid glue. The effect of coal-ash constituents on the extent of each of these sticking regimes is investigated theoretically here by means of a model of ‘self-regulated’ ash deposition.

Copyright © 1988 by ASME
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