Gas turbine engine controls for minimizing combustion dynamics and emissions
First Claim
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1. A method of controlling a gas turbine engine having a compressor, at least one combustor, a turbine, and a control system comprising:
- measuring a compressor inlet temperature;
calculating a turbine reference temperature as a function of at least compressor discharge pressure, exhaust pressure, and pressure across the combustor;
selecting a baseline fuel schedule for a fuel circuit corresponding to the turbine reference temperature;
determining whether a baseline fuel split corresponds to the turbine reference temperature;
determining a bias parameter so as to increase or decrease the baseline fuel split wherein the bias parameter is a percentage change in fuel split that varies as a function of the measured compressor inlet temperature for a given turbine reference temperature; and
,adjusting the fuel flow for the fuel circuit to a sum of the baseline fuel split and the bias parameter.
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Abstract
Embodiments for controlling a gas turbine engine to minimize combustion dynamics and emissions are disclosed. Methods and an apparatus are provided for controlling the gas turbine engine where a compressor inlet temperature is measured and a turbine reference temperature is calculated in real-time and utilized to determine the most-efficient fuel splits and operating conditions for each of the fuel circuits. The fuel flow for the fuel circuits are then adjusted according to the identified fuel split.
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Citations
9 Claims
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1. A method of controlling a gas turbine engine having a compressor, at least one combustor, a turbine, and a control system comprising:
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measuring a compressor inlet temperature; calculating a turbine reference temperature as a function of at least compressor discharge pressure, exhaust pressure, and pressure across the combustor; selecting a baseline fuel schedule for a fuel circuit corresponding to the turbine reference temperature; determining whether a baseline fuel split corresponds to the turbine reference temperature; determining a bias parameter so as to increase or decrease the baseline fuel split wherein the bias parameter is a percentage change in fuel split that varies as a function of the measured compressor inlet temperature for a given turbine reference temperature; and
,adjusting the fuel flow for the fuel circuit to a sum of the baseline fuel split and the bias parameter. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A gas turbine engine comprising:
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an inlet; a compressor; at least one combustor having at least two fuel circuits; a turbine; and
,a control system having a processor and a memory component containing a series of computer-readable instructions that measures a compressor inlet temperature in real-time and calculates a turbine reference temperature that is a function of at least compressor discharge pressure, exhaust pressure and pressure across the combustor, wherein the compressor inlet temperature and turbine reference temperature are utilized to identify a fuel split for each fuel circuit of the combustor with each fuel split biased higher or lower based on measured compressor inlet temperature. - View Dependent Claims (8, 9)
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Specification