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Steam quality measurement apparatus and method

  • US 4,876,897 A
  • Filed: 12/10/1987
  • Issued: 10/31/1989
  • Est. Priority Date: 12/10/1987
  • Status: Expired due to Term
First Claim
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1. Apparatus for measuring two-phase flows output from a boiler having water feed and steam output via a flowpipe, comprising:

  • (a) a horizontally disposed flowpipe carrying from said boiler a two-phase fluid having a vapor phase and a liquid phase;

    (b) a first flowmeter means for producing an output signal related to the water feed flow input to said boiler;

    (c) a first temperature measuring means for producing an output signal related to the water feed temperature input to said boiler;

    (d) first density calculation means for producing a boiler feed density signal from said first temperature measuring means;

    (e) a vortex flowmeter for producing a second velocity signal related to the vapor phase flow rate of said two-phase fluid output from said boiler, said vortex flowmeter having a horizontally disposed vortex generating bar mounted transversely within said flowpipe;

    (f) means for determining the density of the vapor phase of said two-phase fluid and producing a density signal therefrom; and

    (g) calculation block means for deriving the two-phase flow measurand from said first and second density signals, said first flow velocity signal, and said second velocity signal.

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