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Method for predicting recovery boiler leak detection system performance

  • US 6,484,108 B1
  • Filed: 06/05/2000
  • Issued: 11/19/2002
  • Est. Priority Date: 09/26/1997
  • Status: Expired due to Term
First Claim
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1. A method for presenting tradeoffs of the sensitivity and false alarms of a recovery boiler leak detection system, said method comprising the steps of:

  • (a) obtaining leak-free operational data from the recovery boiler;

    (b) specifying a leak probability estimating filter that uses a statistical noise model and a model of how typical leaks grow over time;

    (c) generating a numerical indicator from said filter and said operational data, said numerical indicator having an output that is a measure of leak likelihood;

    (d) selecting an alarm limit for said recovery boiler leak detection system wherein if said output of said numerical indicator exceeds said limit, an alarm is activated in said recovery boiler leak detection system;

    (e) determining the sensitivity of the leak detection system from one of a first sequence of numerical indicator outputs that exceeds said alarm limit in the least amount of time, said first sequence of numerical indicator outputs being generated from simulated recovery boiler inputs and an assumed leak that are fed into said filter;

    (f) determining the number of false alarms from a second sequence of numerical indicator outputs that exceed said alarm limit, said second sequence of numerical indicator outputs being generated by a sequence of said operational leak-free data fed into said filter; and

    (g) presenting tradeoffs among said sensitivity and false alarms.

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