STP809: Effect of Sodium and Potassium on the Hot Corrosion of Gas Turbines

    Haskell, RW
    Engineer, manager, and specialist, General Electric Co., Schenectady, N.Y.

    Doering, HvonE
    Engineer, manager, and specialist, General Electric Co., Schenectady, N.Y.

    Grzybowski, DF
    Engineer, manager, and specialist, General Electric Co., Schenectady, N.Y.

    Pages: 24    Published: Jan 1983


    Abstract

    The determination of a specification for trace metal corrosion-causing contaminants in coal-derived fuels depends on the corrosion resistance of gas turbine hot gas path materials to the deposits produced during the combustion of such fuels. The contaminants of principal concern are compounds of sodium and potassium, which produce deposits of sodium and potassium sulfate.

    This report gives the results of small burner rig (SBR) accelerated corrosion tests with state-of-the-art alloys and coatings for the combustion of distillate fuel doped with sodium and potassium chlorides. The SBR data on the deposit chemistry and corrosion rates are analyzed to give corrosion data for turbine hot gas path components as a function of fuel trace metal contamination. The modes of corrosion attack when sodium and potassium are present in comparison with those when only sodium is present (distillate case) are discussed.

    Keywords:

    alternative fuels, gas turbines, hot corrosion, fuel contaminants, coal gas, coal-derived fuels


    Paper ID: STP29506S

    Committee/Subcommittee: D02.E0

    DOI: 10.1520/STP29506S


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