# US 2026/0104166 A1 · Burner, combustor provided with same, and gas turbine provided with combustor

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- Number: US 2026/0104166 A1
- Document ID: US20260104166A1
- Status: Published application
- Kind: A1
- Application number: 19/116,803
- Filed: 2023-10-13
- Published: 2026-04-16
- Earliest claimed: 2022-10-21
- Assignees: Mitsubishi Heavy Industries, Ltd.
- Applicants: Mitsubishi Heavy Industries, Ltd.
- Inventors: Akio YAMAGUCHI; Shinichi FUKUBA
- Web page: https://patentgrep.com/patent/US20260104166A1

## CPC

- F23R 3/286: {having fuel-air premixing devices (F23R3/30 takes precedence)}
- F23D 14/64: with injectors
- F23R 3/14: by using swirl vanes
- F23D 2900/14021: Premixing burners with swirling or vortices creating means for fuel or air
- F23R 2900/00002: Gas turbine combustors adapted for fuels having low heating value [LHV]
- F23R: GENERATING COMBUSTION PRODUCTS OF HIGH PRESSURE OR HIGH VELOCITY, e.g. GAS-TURBINE COMBUSTION CHAMBERS (fluidised bed combustion apparatus specially adapted for operation at superatmospheric pressures F23C10/16)
- F23D: BURNERS

## Abstract

This burner comprises a mixing pipe in which a mixing space is formed, and a fuel nozzle disposed in the mixing space. The fuel nozzle comprises a nozzle main body extending in an extension direction of the mixing space, and a projecting portion which projects out from an outer circumferential surface of the nozzle main body and which is spaced apart from an inner circumferential surface of the mixing pipe. The nozzle main body has a fuel ejection port capable of ejecting fuel into the mixing space. The projecting portion gradually extends to a downstream side in the extension direction as it extends in a circumferential direction relative to the nozzle main body, and the entire projecting portion is formed in a spiral shape around the nozzle main body.

## Claims

### Claim 1

A burner comprising:
a mixing pipe that extends in a predetermined extending direction and in which a mixing space for mixing air and fuel is formed; and
a fuel nozzle that extends in the extending direction and of which at least a part is disposed in the mixing space,
wherein the mixing pipe has an air inlet through which the air can flow into the mixing space, and an ejection port through which a premixed gas in which the air and the fuel are mixed can be ejected from the mixing space,
the ejection port is formed at an end of the mixing pipe on a downstream side, out of an upstream side which is one side in the extending direction and the downstream side which is the other side of the extending direction,
the fuel nozzle has a nozzle main body that extends in the extending direction, and a protrusion portion that protrudes from an outer peripheral surface of the nozzle main body and is separated from an inner peripheral surface of the mixing pipe,
the nozzle main body has a fuel ejection port that can eject the fuel into the mixing space from a position which is on the downstream side of the air inlet and on the upstream side of the ejection port, and
the protrusion portion gradually extends to the downstream side as the protrusion portion extends in a circumferential direction with reference to the nozzle main body, and an entire portion of the protrusion portion is formed in a spiral shape around the nozzle main body.

### Claim 2 (depends on 1)

The burner according to claim 1,
wherein a maximum protrusion amount of the protrusion portion from the outer peripheral surface of the nozzle main body is equal to or less than a half of a minimum distance from a portion, which is a part of the outer peripheral surface of the nozzle main body and in which the protrusion portion exists in the extending direction, to the inner peripheral surface of the mixing pipe.

### Claim 3 (depends on 1)

The burner according to claim 1,
wherein a maximum protrusion amount of the protrusion portion from the outer peripheral surface of the nozzle main body is equal to or less than 20% of a minimum distance from a portion, which is a part of the outer peripheral surface of the nozzle main body and in which the protrusion portion exists in the extending direction, to the inner peripheral surface of the mixing pipe.

### Claim 4 (depends on 1)

The burner according to claim 1,
wherein the fuel ejection port is formed at an end of the nozzle main body on the downstream side, and
the protrusion portion is formed in a predetermined range on an outer peripheral surface of the nozzle main body from the end of the nozzle main body on the downstream side toward the upstream side of the nozzle main body.

### Claim 5 (depends on 4)

The burner according to claim 4,
wherein the protrusion portion is formed only in the mixing space.

### Claim 6 (depends on 5)

The burner according to claim 5,
wherein the mixing space has a reduced area portion of which a cross-sectional area perpendicular to the extending direction gradually decreases toward the downstream side, and
the reduced area portion is formed in a region in which the protrusion portion exists in the extending direction.

### Claim 7 (depends on 6)

The burner according to claim 6, further comprising:
a nozzle support configured to support the fuel nozzle inside the mixing space,
wherein the nozzle support connects the outer peripheral surface of the nozzle main body and the inner peripheral surface of the mixing pipe at a position on the upstream side of a region in which the reduced area portion is formed in the extending direction.

### Claim 8 (depends on 1)

The burner according to claim 1,
wherein the mixing space is a space having a cylindrical shape, and
the nozzle main body is disposed on a space central axis of the mixing space.

### Claim 9 (depends on 8)

The burner according to claim 8,
wherein the nozzle main body has a large-diameter portion having a cylindrical shape around the space central axis, a reduced diameter portion having a conical shape around the space central axis, and a small-diameter portion having a cylindrical shape around the space central axis,
the reduced diameter portion is connected to an end of the large-diameter portion on the downstream side, and an outer diameter of the reduced diameter portion gradually decreases toward the downstream side,
the small-diameter portion is connected to an end of the reduced diameter portion on the downstream side,
an upstream end of the protrusion portion is located at a boundary between the large-diameter portion and the reduced diameter portion in the extending direction,
a downstream end of the protrusion portion is located at an end of the small-diameter portion on the downstream side, and
a distance from the space central axis to an outer peripheral surface of the protrusion portion is equal to or smaller than an outer diameter of the large-diameter portion at any position in the extending direction.

### Claim 10 (depends on 1)

A combustor comprising:
the burner according to claim 1; and
a pipe in which the premixed gas ejected from the ejection port of the burner can be combusted.

### Claim 11 (depends on 1)

A cluster burner combustor comprising:
a plurality of the burners according to claim 1; and
a pipe in which the premixed gas ejected from of the ejection port of each of the plurality of burners can be combusted,
wherein the extending direction of each of the plurality of burners is the same direction as each other, and
positions of the ejection ports of the plurality of burners in the extending direction are aligned with each other.

### Claim 12 (depends on 10)

A gas turbine comprising:
the combustor according to claim 10;
a compressor configured to compress air to generate compressed air and supply the compressed air to the burner; and
a turbine configured to be driven by a combustion gas generated by the combustion of the premixed gas in the pipe of the combustor.

### Claim 13 (depends on 11)

A gas turbine comprising:
the cluster burner combustor according to claim 11;
a compressor configured to compress air to generate compressed air and supply the compressed air to the plurality of burners; and
a turbine configured to be driven by a combustion gas generated by the combustion of the premixed gas in the pipe of the cluster burner combustor.