STP742

    Program for Steam Purity Monitoring: 2. Results of Power Plant Testing

    Published: Jan 1981


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    Abstract

    The steam purity monitoring program of the Westinghouse Electric Corp. has accumulated a large data base on the chemical purity of water and steam in modern fossil fuel power plants. Three types of monitoring have been employed:

    (a) grab samples taken during a plant visit and returned to the Westinghouse Research and Development Center for analysis by ion chromatography;

    (b) continuous analysis of steam condensate, extracted from the low-pressure (LP) turbine cross-over pipe, using the Westinghouse prototype steam purity monitor; and

    (c) total plant surveys of steam and water purity combining continuous analysis of LP steam and grab sampling of multiple locations to permit correlation of impurity levels throughout the plant during all essential operating cycles, including base load, load swings, and a shutdown and hot restart.

    The plants that have been studied were selected to provide a variety of designs, including both drum and once-through boilers, various operating pressures, and different types of water treatment. Furthermore, care has been taken to study units that have experienced turbine corrosion and units that have operated for long periods without corrosion problems. Results are presented of this broad program of steam purity monitoring, with attention to the typical chemical environment of turbines in power plants in the United States.

    Keywords:

    steam, purity, power plants, sodium, oxygen, cations, pH, conductivity, chlorides, ion chromatography, sulfates, chemistry, turbine, instrumentation, water quality


    Author Information:

    Peterson, SH
    Senior engineers and consulting scientist, Westinghouse Research & Development Center, Pittsburgh, Pa.

    Pensenstadler, DF
    Senior engineers and consulting scientist, Westinghouse Research & Development Center, Pittsburgh, Pa.

    Bellows, JC
    Senior engineers and consulting scientist, Westinghouse Research & Development Center, Pittsburgh, Pa.

    Hickam, WM
    Senior engineers and consulting scientist, Westinghouse Research & Development Center, Pittsburgh, Pa.


    Paper ID: STP28277S

    Committee/Subcommittee: D19.95

    DOI: 10.1520/STP28277S


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