Method for gas turbine light-off
First Claim
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1. A method for light-off of a gas turbine engine comprising:
- a. determining ambient conditions and fuel heating value;
b. accelerating a gas turbine engine at a preset acceleration rate to a speed to provide a supply of combustion air to a combustor for light-off of said gas turbine engine, wherein said preset acceleration rate of said gas turbine engine is determined based upon said ambient conditions and said fuel heating value;
c. activating an ignition source for said combustor of said gas turbine engine; and
d. initiating a flow of fuel to said combustor at a substantially constant rate via a fuel line to provide an optimum supply of fuel to said combustor and maintaining said constant rate until the correct fuel-to-air ratio is achieved and light-off of said gas turbine engine occurs.
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Abstract
A method for gas turbine light-off that utilizes a fixed or secondary fuel line that provides a substantially constant flow of fuel to the combustor primarily upon light-off.
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Citations
17 Claims
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1. A method for light-off of a gas turbine engine comprising:
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a. determining ambient conditions and fuel heating value;
b. accelerating a gas turbine engine at a preset acceleration rate to a speed to provide a supply of combustion air to a combustor for light-off of said gas turbine engine, wherein said preset acceleration rate of said gas turbine engine is determined based upon said ambient conditions and said fuel heating value;
c. activating an ignition source for said combustor of said gas turbine engine; and
d. initiating a flow of fuel to said combustor at a substantially constant rate via a fuel line to provide an optimum supply of fuel to said combustor and maintaining said constant rate until the correct fuel-to-air ratio is achieved and light-off of said gas turbine engine occurs. - View Dependent Claims (2, 3, 5, 6, 7, 8, 9)
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4. A method for light-off of a gas turbine engine comprising:
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a. accelerating a gas turbine engine at a preset acceleration rate to a speed to provide a supply of combustion air to a combustor for light-off of said gas turbine engine;
b. determining ambient conditions and fuel heating value;
c. activating an ignition source for said combustor of said gas turbine engine, wherein said ignition source is activated based upon said ambient conditions and said speed of said gas turbine engine, d. initiating a flow of fuel to said combustor at a substantially constant rate via a fuel line to provide an optimum supply of fuel to said combustor and maintaining said constant rate until the correct fuel-to-air ratio is achieved and light-off of said gas turbine engine occurs.
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10. A method for light-off of a gas turbine engine comprising:
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a. accelerating a gas turbine engine at a preset acceleration rate to a speed to provide a supply of combustion air to a combustor for light-off of said gas turbine engine;
b. activating an ignition source for said combustor of said gas turbine engine;
c. initiating a flow of fuel to said combustor at a substantially constant rate via a secondary fuel line to provide an optimum supply of fuel to said combustor and maintaining said constant rate until the correct fuel-to-air ratio is achieved and light-off of said gas turbine engine occurs; and
d. initiating a flow of fuel to said combustor via a primary fuel line after light-off has occurred, and ramping up said flow of fuel to said combustor of said gas turbine engine to increase said speed of said gas turbine engine to a final speed to which a load is applied. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A method for light-off of a gas turbine engine comprising:
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a. determining ambient conditions and fuel heating value;
b. setting an acceleration rate of a gas turbine engine based upon said ambient conditions and said fuel heating value;
c. applying electrical assistance to accelerate said gas turbine engine at said acceleration rate, whereby a turbine drive shaft rotates causing compressor blades and turbine blades to rotate;
d. activating an ignition source for a combustor of said gas turbine engine;
e. supplying a flow of fuel to said combustor of said gas turbine engine at a substantially constant rate via a secondary fuel line until light-off of said gas turbine engine occurs;
f. sensing for ignition of said gas turbine engine;
g. eliminating said electrical assistance to said gas turbine engine after ignition has occurred based upon a fixed value of a speed of said turbine blades; and
i. initiating a flow of fuel to said combustor via a primary fuel line and ramping up said flow of fuel to said combustor of said gas turbine engine to increase said speed of said gas turbine engine to a final speed to which a load is applied.
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Specification