Abstract:
PROBLEM TO BE SOLVED: To control an air flow rate of a working fluid to a combustor having a late lean fuel injection pipe.SOLUTION: A system includes: an outer casing 52 that defines a high pressure plenum 98 surrounding a portion of a combustor 24; an extraction port 106 in fluid communication with the high pressure plenum; and an inlet port 108. The combustor includes: a plurality of fuel injectors arranged around a combustion liner 70; an inner flow sleeve; and an outer air shield 62 that surrounds the plurality of fuel injectors and the inner flow sleeve. The outer air shield defines: an injection air plenum between the outer air shield and the inner flow sleeve; and an inlet to the injection air plenum 90. An external fluid circuit 54 provides fluid communication between the extraction port and the inlet port. A baffle 56 extends between the outer casing and the outer air shield to provide flow separation between the inlet and the high pressure plenum.
Abstract:
PROBLEM TO BE SOLVED: To provide a system that includes a combustor cap assembly for a multi-tube fuel nozzle.SOLUTION: A combustor cap assembly 60 includes: a support structure 106 defining an interior volume configured to receive an air flow; a plurality of mixing tubes 18 disposed within the interior volume, where each of the plurality of mixing tubes comprises a corresponding fuel injector and is individually removable from the combustor cap assembly 60; an air distributor disposed within the interior volume and configured to distribute the air flow received by the interior volume to each of the plurality of mixing tubes, and a combustor cap removably coupled to the support structure 106.
Abstract:
PROBLEM TO BE SOLVED: To provide a system and method for tube-level air flow conditioning, which can achieve a faster and more uniform mixture of fuel and air and is also durable and easily maintainable.SOLUTION: A system includes a multi-tube fuel nozzle. The multi-tube fuel nozzle includes a plurality of mixing tubes. Each mixing tube comprises, an annular wall disposed around a central passage, and an air inlet region configured for placement around a fuel injector extending into the central passage. The central passage extends from an upstream end to a downstream end of the annular wall with respect to a flow direction through the central passage. The air inlet region comprises an air intake surface of the annular wall which gradually decreases in diameter in the flow direction.
Abstract:
PROBLEM TO BE SOLVED: To provide a system and a method for supporting a fuel nozzle inside a combustor.SOLUTION: A system for supporting a fuel nozzle inside a combustor includes: a ring that circumferentially surrounds the fuel nozzle inside the combustor; a support plate that extends radially inside at least a portion of the ring; and a first connection part between the support plate and at least one of the fuel nozzles inside the combustor. A second connection part is placed between the support plate and the ring. A method for supporting the fuel nozzle inside the combustor includes a step of surrounding the fuel nozzle by using the ring, a step of connecting the support plate to the ring, and a step of connecting the support plate to at least one fuel nozzle.
Abstract:
PROBLEM TO BE SOLVED: To provide a combustor and a method for supplying fuel to a combustor.SOLUTION: A combustor includes an end cap having upstream and downstream surfaces, and a cap shield (32, 132) surrounding the upstream and downstream surfaces. First and second sets of premixer tubes extend from the upstream surface through the downstream surface. A first fuel conduit (44, 144) supplies fuel to the first set of premixer tubes. A casing (12, 112) circumferentially surrounds the cap shield (32, 132) to define an annular passage (26, 126). A second fuel conduit (46, 146) supplies the fuel through the annular passage (26, 126) to the second set of premixer tubes. A method of supplying the fuel to the combustor includes: flowing of working fluid to the first set of premixer tubes and the second set of premixer tubes; flowing of first fuel to the first set of premixer tubes; and flowing of second fuel through the annular passage (26, 126) surrounding the end cap to the second set of premixer tubes.
Abstract:
PROBLEM TO BE SOLVED: To provide an improved system and method for reducing fluctuation in the pressure and/or flow of a working fluid flowing in late lean injectors.SOLUTION: The system for supplying the working fluid to a combustor includes a fuel nozzle, and a combustion chamber downstream from the fuel nozzle. A flow sleeve circumferentially surrounds the combustion chamber, and a plurality of fuel injectors are circumferentially arranged around the flow sleeve to provide fluid communication through the flow sleeve to the combustion chamber. A distribution manifold circumferentially surrounds the plurality of fuel injectors, and a fluid passage passing through the distribution manifold provides fluid communication through the distribution manifold to the plurality of fuel injectors. The method for supplying the working fluid to the combustor includes allowing the working fluid to flow from the compressor through the combustion chamber, and diverting a portion of the working fluid through the distribution manifold that circumferentially surrounds the plurality of fuel injectors circumferentially arranged around the combustion chamber.
Abstract:
PROBLEM TO BE SOLVED: To provide an end cover with fuel plenums to simplify a fuel supply passage and a connection part.SOLUTION: A system includes a system having an end cover 42 of a combustor for a gas turbine. The end cover has at least one fuel plenum 52 coupled to a plurality of fuel injectors 66 for a multi-tube fuel nozzle 12 having a plurality of fuel-air mixing tubes, each tube having one of the fuel injectors. At least one fuel plenum is configured to provide fuel to each of the fuel injectors.
Abstract:
PROBLEM TO BE SOLVED: To provide a system including a multitubular fuel nozzle.SOLUTION: A multitubular fuel nozzle includes a plurality of fuel injectors. Each fuel injector is configured to extend into a premixing tube of each of a plurality of mixing tubes. Each fuel injector comprises a body, a fuel passage and a plurality of fuel ports. The fuel passage is disposed in the body and extends in a longitudinal direction in a part of the body. The plurality of fuel ports are disposed along the part of the body and connected to the fuel passage. A space is arranged between the part of the body with the plurality of fuel ports and each premixing tube.
Abstract:
PROBLEM TO BE SOLVED: To provide a transition duct that makes it possible to cool at least a portion of an end frame terminal end by decreasing and/or eliminating cooling passages that extend through the end frame terminal end.SOLUTION: A transition duct for a combustor of a gas turbine generally includes an end frame that has a radially outer portion, a radially inner portion opposed to the radially outer portion, a first side portion between the radially outer and inner portions, and a second side portion opposed to the first side portion between the radially outer and inner portions. There may be a slot in at least one of the radially outer and inner portions and the first and second side portions of the end frame. A first plurality of axially extending passages may pass through the end frame and intersect with the slot. A terminal end of the end frame may be continuously adjacent to the slot.