Cooling air recycling for gas turbine transition duct end frame and related method
First Claim
Patent Images
1. A transition duct assembly for a gas turbine that includes a compressor and at least one combustor, the duct assembly comprising:
- a transition duct having opposite ends, one of said ends adapted to communicate with an inlet to a first turbine stage and another of said opposite ends adapted for connection to said at least one combustor;
an impingement cooling sleeve surrounding said transition duct with an annulus therebetween, said impingement cooling sleeve having a plurality of cooling holes formed therein for receiving discharge air from the compressor and directing the discharge air towards said at least one combustor;
said one end of said transition duct including an end frame, a forward edge of said impingement cooling sleeve received in said end frame;
said end frame having a first plurality of cooling holes axially beyond the forward edge of said impingement cooling sleeve, each cooling hole communicating at one end with space external of said impingement cooling sleeve; and
a second plurality of cooling holes in said end frame, each communication at one end with said annulus, and at an opposite end with said first plurality of cooling holes, said second plurality of holes oriented such that, in use, cooling air passing through said first plurality of cooling holes will be directed through said second plurality of cooling holes and mix with discharge air in said annulus directed towards said at least one combustor.
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Abstract
A method of cooling a transition duct end frame in a gas turbine includes the steps of a) directing cooling air into the end frame from a region external of the transition duct and the impingement cooling sleeve; and b) redirecting the cooling air from the end frame into the annulus between the transition duct and the impingement cooling sleeve.
126 Citations
12 Claims
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1. A transition duct assembly for a gas turbine that includes a compressor and at least one combustor, the duct assembly comprising:
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a transition duct having opposite ends, one of said ends adapted to communicate with an inlet to a first turbine stage and another of said opposite ends adapted for connection to said at least one combustor;
an impingement cooling sleeve surrounding said transition duct with an annulus therebetween, said impingement cooling sleeve having a plurality of cooling holes formed therein for receiving discharge air from the compressor and directing the discharge air towards said at least one combustor;
said one end of said transition duct including an end frame, a forward edge of said impingement cooling sleeve received in said end frame;
said end frame having a first plurality of cooling holes axially beyond the forward edge of said impingement cooling sleeve, each cooling hole communicating at one end with space external of said impingement cooling sleeve; and
a second plurality of cooling holes in said end frame, each communication at one end with said annulus, and at an opposite end with said first plurality of cooling holes, said second plurality of holes oriented such that, in use, cooling air passing through said first plurality of cooling holes will be directed through said second plurality of cooling holes and mix with discharge air in said annulus directed towards said at least one combustor.- View Dependent Claims (2, 3, 4)
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5. A method of cooling a transition duct end frame in a gas turbine with cooling air and recirculating the cooling air to a combustor of the gas turbine wherein an impingement cooling sleeve having a plurality of cooling apertures therein surrounds the transition duct creating an annulus therebetween, and wherein a forward end of said transition duct includes a transition duct end frame, with a forward flange of said impingement sleeve also received in the end frame, the method comprising:
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a) directing cooling air into the end frame from a region external of said transition duct and said impingement cooling sleeve; and
b) redirecting said cooling air from said end frame into the annulus between the transition duct and the impingement cooling sleeve in a direction toward the combustor. - View Dependent Claims (6, 7, 8, 9)
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10. A method of reducing combustion flame temperature in a gas turbine that includes a compressor, at least one combustor, at least one turbine stage and a transition duct connecting said at least one combustor with said at least one turbine stage, the transition duct having an integral end frame connected to said at least one turbine stage, the method comprising:
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a) directing cooling air into and through the end frame from a region external of said transition duct to cool the end frame; and
b) redirecting said cooling air from the end frame to said at least one combustor. - View Dependent Claims (11)
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12. A transition duct assembly for a gas turbine that includes a compressor and at least one combustor, the duct assembly comprising:
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a transition duct having opposite ends, one of said ends adapted to communicate with an inlet to a first turbine stage and another of said opposite ends adapted for connection to said at least one combustor;
an impingement cooling sleeve surrounding said transition duct with an annulus therebetween, said impingement cooling sleeve having a plurality of cooling holes formed therein for receiving discharge air from the compressor and directing the discharge air into said annulus and then towards said at least one combustor;
a transition duct end frame integral with said one end of said transition duct, a forward edge of said impingement cooling sleeve received in said end frame; and
means for supplying cooling air into and through the end frame and for redirecting said cooling air to said at least one combustor.
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Specification