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Systems and methods for determining a target exhaust temperature for a gas turbine

  • US 9,297,315 B2
  • Filed: 09/28/2012
  • Issued: 03/29/2016
  • Est. Priority Date: 09/28/2012
  • Status: Active Grant
First Claim
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1. A method comprising:

  • determining a target exhaust temperature for a gas turbine engine comprising a compressor based at least in part on a compressor pressure condition;

    determining a total flow rate comprising an air flow rate of the compressor and a steam flow rate of the compressor by multiplying a compressor discharge pressure by a constant;

    determining the air flow rate by subtracting the steam flow rate from the total flow rate;

    determining a water concentration by dividing the steam flow rate by the air flow rate;

    determining a steam humidity by multiplying the water concentration by a calibration factor that is application specific;

    determining a temperature adjustment to the target exhaust temperature based at least in part on the steam humidity;

    changing the target exhaust temperature based at least in part on the temperature adjustment; and

    applying the target exhaust temperature using a controller to set a fuel flow and/or air flow to a combustor of the gas turbine to achieve emissions requirements.

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