Virtual continuous emission monitoring system with sensor validation

  • US 5,386,373 A
  • Filed: 08/05/1993
  • Issued: 01/31/1995
  • Est. Priority Date: 08/05/1993
  • Status: Expired due to Term
First Claim
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1. A method for monitoring emissions in a manufacturing plant that are generated as a by-product of the operation of the plant, the manufacturing plant having controls operating in response to received control values to alter the operation of the plant and sensors to measure the operating parameters of the plant and output associated sensor values, comprising the steps of:

  • measuring on a periodic basis the level of pollutants emitted by the plant;

    measuring the control values to the plant and the sensor values;

    storing a representation of the plant in a virtual sensor predictive network having as an output a predicted pollutant level that corresponds to the actual pollutant level output by the manufacturing plant, the control values of the plant and the sensor values of the plant comprising inputs to the virtual sensor predictive network, the stored representation learned from the measured pollutant level, the control values and the sensor values, the virtual sensor predictive network operable to be trained upon the measured level of pollutants, the measured control values and the sensor values to generate the stored representation;

    generating an error when the difference between the measured level of pollutants and the predicted pollutant level exceeds a predetermined threshold;

    retraining the virtual sensor predictive network upon the generation of an error; and

    controlling the plant utilizing the predicted pollutant level in accordance with a predetermined control scheme to vary the control values.

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