Burner, combustor, and gas turbine

Abstract

This burner comprises: a plate in which a plurality of mixing passages that are configured such that air is supplied to the insides thereof and that extend in the axial direction are formed; a plurality of fuel nozzles which are configured to inject fuel into the plurality of respective mixing passages; a groove which is provided on the plate so as to be recessed in the axial direction from the upstream end surface of the plate in the axial direction and which has a bottom surface and an inner wall surface that extends in the axial direction; and a plurality of supports which are for supporting the plurality of respective fuel nozzles on the inner wall surface of the groove. The upstream ends of the plurality of mixing passages are open to the bottom surface of the groove. The plurality of fuel nozzles include a first nozzle and a second nozzle that are provided in one-to-one correspondence with a pair of adjacent mixing passages among the plurality of mixing passages. The tip of the second nozzle is positioned downstream of the tip of the first nozzle in the axial direction. The bottom surface includes the upstream end surface, in the axial direction, of a partition that partitions the pair of mixing passages in the plate. The upstream end surface of the partition includes a first portion that forms the inlet of a first mixing passage of the pair of mixing passages corresponding to the first nozzle and a second portion that is positioned downstream of the first portion in the axial direction and that forms the inlet of a second mixing passage of the pair of mixing passages corresponding to the second nozzle.

Claims

1. A plate configured to supply air internally and having a plurality of mixing channels extending along the axial direction; a plurality of fuel nozzles configured to inject fuel into the plurality of mixing channels, respectively; a groove provided in the plate so as to be recessed in the axial direction from the upstream end face of the plate in the axial direction, having a bottom surface and an inner wall surface extending along the axial direction; a plurality of support parts for supporting the plurality of fuel nozzles on the inner wall surface of the groove, wherein the upstream end of each of the plurality of mixing channels opens to the bottom surface of the groove; the plurality of fuel nozzles include a first nozzle and a second nozzle provided corresponding to an adjacent pair of mixing channels among the plurality of mixing channels, the tip of the second nozzle is located downstream of the tip of the first nozzle in the axial direction; the bottom surface includes the upstream end face in the axial direction of a partition portion of the plate that separates the pair of mixing channels; the upstream end face of the partition portion has a first portion that forms the inlet of the first mixing channel corresponding to the first nozzle among the pair of mixing channels, A burner comprising: a second portion located downstream of the first portion in the axial direction, which forms the inlet of a second mixing channel corresponding to the second nozzle among the pair of mixing channels.

2. The burner according to claim 1, wherein the first portion has a curved shape that is smoothly connected to the first mixing channel, and the second portion has a curved shape that is smoothly connected to the second mixing channel.

3. In a cross-section including the arrangement direction of the pair of mixing channels and the axial direction, the first portion and the second portion each have a curved shape projecting toward the upstream side in the axial direction, and in the cross-section, the point of the curved shape forming the second portion that is located furthest upstream in the axial direction is located downstream in the axial direction than the point of the curved shape forming the first portion that is located furthest upstream in the axial direction. The burner according to claim 2.

4. The burner according to claim 2 or 3, wherein in a cross section including the width direction of the groove perpendicular to the arrangement direction of the plurality of mixing channels when viewed from the axial direction, and the axial direction, the first portion and the second portion each have a curved shape that is concave toward the downstream side in the axial direction.

5. The burner according to any one of claims 1 to 3, wherein the partition portion includes a connecting portion that connects the first portion and the second portion, and the connecting portion has a surface that extends along the width direction of the groove which is perpendicular to the arrangement direction of the plurality of mixing channels when viewed from the axial direction, and along a plane including the axial direction.

6. The burner according to claim 5, wherein the surface of the connecting portion includes a flat surface extending along the plane.

7. The burner according to any one of claims 1 to 3, wherein the plurality of mixing channels are arranged circumferentially with respect to a center line along the axial direction, and the grooves include circumferential grooves extending along the circumferential direction.

8. The burner according to claim 7, wherein the inner wall surface of the circumferential groove has an inner wall surface and an outer wall surface located radially outward from the inner wall surface and facing the inner wall surface, and each of the plurality of support portions is connected to at least one of the inner wall surface or the outer wall surface.

9. A burner according to any one of claims 1 to 3, wherein each of the plurality of segments obtained by dividing a region including the central axis of the burner in the circumferential direction when viewed from the axial direction is provided with at least one mixing channel from the plurality of mixing channels, and the mixing distance differs between pairs of adjacent segments in the circumferential direction from the downstream end of the fuel nozzle to the outlet opening of the mixing channel corresponding to the fuel nozzle in the axial direction.

10. A combustor comprising a burner according to any one of claims 1 to 3, and a combustion cylinder provided downstream of the burner.

11. A gas turbine comprising: a combustor according to claim 10; and a turbine configured to be driven by combustion gas from the combustor.

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