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Assisted commissioning method for combustion control system

  • US 8,602,772 B2
  • Filed: 02/20/2008
  • Issued: 12/10/2013
  • Est. Priority Date: 02/20/2008
  • Status: Expired due to Fees
First Claim
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1. A method of commissioning a combustion control system for controlling operation of a boiler combustion system having a burner, a fuel flow control device operatively associated with said burner and an air flow control device operatively associated with said burner, the method including mapping a plurality of sets of coordinated servo positions for the fuel flow control device and the air flow control device at a plurality of selected firing rate points between a minimum firing rate and a maximum firing rate, said mapping process comprising, for at least one of said plurality of selected firing rate points, the steps of:

  • (a) determining one of either the servo position of the fuel flow control device or the servo position of the air flow control associated with the selected firing rate point;

    (b) defining an excess oxygen content target value for the selected firing rate point;

    (c) repositioning the other of the air flow control device or the fuel flow control device from a previous servo position known to be associated with a measured excess oxygen content value less than the excess oxygen content target value to a current servo position estimated to be associated with an excess oxygen content value greater than the target value;

    (d) estimating an optimum servo position for the other of the air flow control device or the fuel flow control device at the selected firing rate by applying an algorithm comprising a function of the previous servo position, the current servo position, a measured value of the excess oxygen content at the previous servo position, a measured value of the excess oxygen content at the current servo position, and said excess oxygen target value; and

    (e) repeating steps (c) and (d) until the measured value of the excess oxygen content at the current servo position falls within a preselected range of said excess oxygen target value, thereby defining the optimum servo position for the other of the air flow control device or the fuel flow control device at the selected firing rate; and

    (f) saving the optimum servo position of the other of the air flow control device or the fuel flow control device at the selected firing rate and the servo position of the one of the fuel flow control device or the air flow control associated with the selected firing rate at step (a) as a coordinated set associated with the selected firing rate.

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