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Method and apparatus for improved process control in combustion applications

  • US 7,217,121 B2
  • Filed: 04/07/2004
  • Issued: 05/15/2007
  • Est. Priority Date: 06/26/2000
  • Status: Expired due to Fees
First Claim
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1. A method for process control in a steelmaking combustion application, comprising:

  • a) transmitting a frequency modulated near-infrared laser beam through off-gas produced by a steelmaking combustion application, the modulation frequency of the laser beam greater than the absorption line width of targeted CO and H2O produced by the steelmaking combustion application;

    b) detecting the transmitted laser beam;

    c) analyzing the detected laser beam for select CO and H2O absorption lines;

    d) determining the CO concentration from the CO and H2O absorption lines; and

    e) adjusting select inputs of the combustion application in response to the CO concentration.

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