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APC process control when process parameters are inaccurately measured

  • US 7,698,004 B2
  • Filed: 12/03/2004
  • Issued: 04/13/2010
  • Est. Priority Date: 08/27/2004
  • Status: Expired due to Fees
First Claim
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1. A controller for directing control of a process, having multipleprocess parameters (MPPs), performed to control an amount of a pollutant emitted into the air, comprising:

  • one of a neural network process model and a non-neural network process model, the one model representing a relationship between one of the MPPs and other of the MPPs;

    a control processor configured with the logic to determine validity of a measured value of the one MPP based on the one model, and to direct control of the process in accordance with the measured value of the one MPP, only if the measured value of the one MPP is determined to be valid; and

    an estimator configured with logic to estimate the value of the one MPP based on actual values of the other MPPs and the one model;

    wherein the control processor determines the validity of the measured value of the one MPP based on the one model by comparing the estimated value of the one MPP with the measured value of the one MPP and, if the measured value of the one MPP is determined to be invalid, directs control of the process in accordance with an estimated value of the one MPP;

    wherein the process is a wet flue gas desulfurization (WFGD) process which applies a reactant to remove SO2 from SO2 laden wet flue gas, and exhausts desulfurized flue gas;

    wherein the one MPP is a pH level of the applied reactant;

    wherein the one model represents a relationship between the pH level of the applied reactant and the other MPPs;

    wherein the estimator estimates the value of the pH level of the applied reactant based on the actual values of the other MPPs and the one model; and

    wherein the control processor compares the estimated value of the pH level of the applied reactant with the measured value of the pH level of the applied reactant, to determine the validity of the measured value of the pH level of the applied reactant, and (i) if the measured value of the pH level of the applied reactant is determined to be valid, directs control of the WFDG process in accordance with the measured value of the pH level of the applied reactant, and (ii) if the measured value of the pH level of the applied reactant is determined to be invalid, directs control of the WFGD process in accordance with the estimated value of the pH level of the applied reactant.

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