JP2020012591A - Multiple nozzle burner and burner - Google Patents

Abstract

To inhibit an air hole plate from being deformed in an axial direction in a multiple nozzle burner.SOLUTION: A multiple nozzle burner includes multiple fuel nozzles for supplying a fuel; and an air hole plate which is provided at the downstream side of the fuel nozzles and has air holes from which air is jetted at positions corresponding to discharge ports of the fuel nozzles. The air hole plate is provided so as to be movable in a radial direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a multi-nozzle burner and a combustor.

  For example, Patent Document 1 discloses a gas turbine combustor that burns a hydrogen-containing fuel. The gas turbine combustor disclosed in Patent Literature 1 includes a plurality of small-diameter fuel nozzles on the upstream side of the combustion chamber, and supplies fuel from each fuel nozzle. Further, in the gas turbine combustor of Patent Document 1, air and fuel are both injected into the combustion chamber from an air hole plate provided downstream of the fuel nozzle and having a large number of air holes. In this way, by supplying fuel from a plurality of small-diameter fuel nozzles, mixing with air is rapidly performed, and a combustion state close to a premixed flame can be formed while forming a diffusion flame. .

JP 2013-108667 A

  By the way, in the air hole plate of the multi-nozzle burner as described above, a flame is formed near the central portion and is constantly heated by the flame. Since the outer periphery of the air hole plate is fixed, the air hole plate is deformed such that the expanded center portion protrudes in the axial direction.

  The present invention has been made in view of the above-described problems, and has as its object to suppress deformation of an air hole plate in an axial direction in a multi-nozzle burner.

  According to a first aspect of the present invention, there is provided a multi-nozzle burner including a plurality of fuel nozzles for supplying fuel, the burner being provided on a downstream side of the fuel nozzle and a discharge port of the fuel nozzle. And an air hole plate having an air hole from which air is injected at a position corresponding to the air hole plate, and the air hole plate is provided so as to be movable in a radial direction.

  As a second means, in the first means, the air hole plate has a configuration in which an outer periphery is movably held in a radial direction.

  As a third means, in the above first or second means, the fuel nozzle is provided so as to be movable and fixed to the air hole plate.

  As a fourth means, in the above third means, a fuel supply unit connected to the plurality of fuel nozzles and distributing fuel to each fuel nozzle, and a flexible unit connecting the fuel supply unit and the fuel nozzles And a sexual connection part.

  As a fifth means, a configuration is adopted in which the combustor includes the multi-nozzle burner according to any one of claims 1 to 4 and a combustor liner in which a flame is formed.

  According to the present invention, the air hole plate can be moved in the radial direction. Thereby, when the air hole plate thermally expands, it can be expanded in the radial direction. Therefore, the deformation of the air hole plate in the axial direction can be suppressed.

1 is a schematic cross-sectional view including a multi-nozzle burner according to an embodiment of the present invention. It is a schematic cross section which shows the modification of the multi-nozzle burner which concerns on one Embodiment of this invention. It is a mimetic diagram of an air hole plate showing the modification of the multi-nozzle burner concerning one embodiment of the present invention.

  Hereinafter, an embodiment of a multi-nozzle burner according to the present invention will be described with reference to the drawings.

[First Embodiment]
First, the multi-nozzle burner 1 according to the present embodiment is provided in a gas turbine (not shown). The gas turbine includes a compressor, a turbine, and a combustor 100 (not shown). The gas turbine compresses air taken from outside air to a predetermined pressure in a compressor to generate compressed air, and burns fuel in the combustor 100 using the compressed air as an oxidant. Further, the gas turbine generates rotation power by rotating the turbine with combustion gas generated by burning fuel.

  As shown in FIG. 1, the combustor 100 includes a casing 110, a combustor liner 120, a multi-nozzle burner 1, a rectifier, and the like.

  The multi-nozzle burner 1 is provided for the combustor liner 120 and injects fuel into the combustor liner 120. As shown in FIG. 1, the fuel supply unit 2, the air hole plate 3, and the plate fixing unit Unit 4.

  The fuel supply section 2 includes a fuel supply pipe 2a, a plurality of fuel nozzles 2b, a flexible connection section 2c, and a nozzle fixing section 2d. The fuel supply pipe 2a is connected to an external fuel tank and connected to a plurality of fuel nozzles 2b, and functions as a header pipe for distributing fuel to each fuel nozzle 2b.

  The fuel nozzle 2b is connected to the fuel supply unit 2 and has a discharge port facing the combustor liner 120. The plurality of fuel nozzles 2b are arranged and each guide the fuel to the combustor liner 120.

  The flexible connection portion 2c is a tubular member that connects the fuel supply pipe 2a and the fuel nozzle 2b, and has a bellows shape. Thereby, the flexible connection portion 2c is capable of extending and contracting in the axial direction and is bendable.

  The nozzle fixing portion 2d is a member for fixing the fuel nozzle 2b to the air hole plate 3. The nozzle fixing portion 2d includes a plurality of rod-shaped members extending in the radial direction of the fuel nozzle 2b and having one end fixed to the air hole plate 3, and fixes the fuel nozzle 2b to the air hole plate 3 so as not to move. Such nozzle fixing portions 2d are provided at four positions in the circumferential direction of the fuel nozzle 2b.

  The air hole plate 3 is a disc-shaped member provided on the discharge port side of the fuel nozzle 2b, and has an air hole h formed at a position overlapping the discharge port of the fuel nozzle 2b. That is, a plurality of air holes h are formed in the air hole plate 3, and each air hole h is arranged so as to surround the discharge port of each fuel nozzle 2b when viewed from the combustor liner 120 side. Such an air hole plate 3 is provided at an end of the combustor liner 120 and is fixed by the plate fixing portion 4.

  The plate fixing portions 4 are provided at a plurality of locations along the outer periphery of the air hole plate 3. The plate fixing portions 4 sandwich the air hole plate 3 between two plate portions formed in parallel with the air hole plate 3. Are connected by bolts or the like, thereby sandwiching the air hole plate 3 from the axial direction of the fuel nozzle 2b and fixing the air hole plate 3 to the casing 110. Further, a slight gap is formed between the plate fixing part 4 and the combustor liner 120.

  The casing 110 is a substantially cylindrical member that houses the multi-nozzle burner 1 and the combustor liner 120.

The combustor liner 120 has a substantially cylindrical shape, and is surrounded by a casing 110. The inside of the combustor liner 120 is a combustion chamber, and a flame is formed inside.
Further, a gap between the casing 110 surrounding the combustor liner 120 and the peripheral surface of the combustor liner 120 is a compressed air flow path for guiding the compressed air from the downstream side to the upstream side in the flame forming direction. That is, the compressed air flows into the casing 110 from the direction opposite to the flame forming direction. The compressed air flow path is formed from the gap between the casing 110 and the peripheral surface of the combustor liner 120 to the inside of the combustor liner 120 via the space between the fuel nozzle 2 b and the air hole plate 3. A rectifier is provided on the compressed air flow path.

The operation of the combustor liner 120 will be described.
In the combustor liner 120, fuel is guided to the fuel nozzle 2b via the fuel supply pipe 2a of the fuel supply unit 2. The fuel injected from the fuel nozzle 2b is discharged into the combustor liner 120 through the air holes h of the air hole plate 3.

  Further, the compressed air supplied into the casing 110 of the combustor 100 passes through the compressed air flow path and is discharged through the air holes h of the air hole plate 3. At this time, the compressed air flows in the axial direction of the fuel nozzle 2b while surrounding the periphery of the fuel nozzle 2b. Then, the compressed air discharged from the air hole h to the combustor liner 120 comes into contact with the fuel injected from the fuel nozzle 2b. As a result, the fuel and the compressed air are mixed and form a circulating flow while becoming a combustion gas, and spread inside the combustor liner 120.

  Further, the air hole plate 3 is heated by the formation of a flame in the vicinity of the axis (in the vicinity of the center of the combustor liner 120) in the combustor liner 120. Then, the air hole plate 3 has a high temperature at the center, thermally expands, and extends radially outward. At this time, since the air hole plate 3 is sandwiched by the plate fixing portion 4 without being welded to the combustor liner 120, the outer peripheral portion can move radially outward due to thermal expansion.

  According to such an embodiment, since the air hole plate 3 is movable in the radial direction, it is possible to suppress the central portion of the air hole plate 3 from being deformed in the axial direction due to thermal expansion.

  Further, according to the present embodiment, the fuel nozzle 2b and the fuel supply pipe 2a are connected by the flexible connecting portion 2c, and the fuel nozzle 2b and the air hole plate 3 are fixed. Thus, when the air hole plate 3 extends in the radial direction, the fuel nozzle 2b can also move in the radial direction with the deformation of the air hole plate 3 while maintaining the positional relationship corresponding to the position of the air hole h. It is.

  Further, since a gap is formed between the plate fixing portion 4 and the combustor liner 120, the plate fixing portion 4 does not hinder the axial extension of the combustor liner 120 due to thermal expansion.

[Second embodiment]
A modification of the multi-nozzle burner 1 according to the first embodiment will be described as a second embodiment with reference to FIG.

  As shown in FIG. 2, the multi-nozzle burner 1 includes an air hole plate 3A instead of the air hole plate 3. The air hole plate 3A includes detachable units 3a to 3g. In this case, the fuel nozzle 2b is also provided corresponding to each air hole h.

  Each of the attachment / detachment units 3a to 3g is a circular portion having a plurality of air holes h formed therein, and is detachable together with a corresponding plurality of fuel nozzles 2b. The detachable units 3a to 3g are connected to each other so as to be movable in the radial direction of the detachable unit. Further, the detachable units 3a to 3f on the outer peripheral side are movably connected to the casing 110.

  In the air hole plate 3A, the expansion amounts of the attachment / detachment units 3a to 3g differ from the heat distribution generated by the distance from the flame. Therefore, by adopting such a configuration, each of the detachable units 3a to 3g can move in the radial direction, and can be prevented from being deformed in the axial direction.

  The preferred embodiment of the present invention has been described with reference to the drawings, but the present invention is not limited to the above embodiment. The shapes, combinations, and the like of the constituent members shown in the above-described embodiments are merely examples, and can be variously changed based on design requirements and the like without departing from the spirit of the present invention.

  In the above embodiment, the plate fixing portion 4 is fixed with the air hole plate 3 sandwiched between two flat plates, but the present invention is not limited to this. As shown in FIG. 3, the plate fixing portion 4 is a substantially U-shaped member, and the inlet portion may have a shape narrower than the thickness of the air hole plate 3. In this case, the plate fixing portion 4 fixes the air hole plate 3 by an elastic force that works by inserting the air hole plate 3. With such a simple configuration, the air hole plate 3 can be easily fixed.

  In the above embodiment, the air hole plate 3 is fixed while being sandwiched by the plate fixing portion 4, but the present invention is not limited to this. The air hole plate 3 may be lifted and fixed by a long member.

Reference Signs List 1 multi-nozzle burner 2 fuel supply section 2a fuel supply pipe 2b fuel nozzle 2c flexible connection section 2d nozzle fixing section 3 air hole plate 3a detachable unit 3A air hole plate 3b detachable unit 3c detachable unit 3d detachable unit 3e detachable unit 3f detachable Unit 3g Detachable unit 4 Plate fixing part 100 Combustor 110 Casing 120 Combustor liner h Air hole

Claims (5)

A multi-nozzle burner including a plurality of fuel nozzles for supplying fuel,
An air hole plate provided on the downstream side of the fuel nozzle and having an air hole from which air is injected at a position corresponding to a discharge port of the fuel nozzle,
The multi-nozzle burner, wherein the air hole plate is provided so as to be movable in a radial direction.   2. The multi-nozzle burner according to claim 1, wherein an outer periphery of the air hole plate is held so as to be movable in a radial direction. 3.   The multi-nozzle burner according to claim 1, wherein the fuel nozzle is movably provided and fixed to the air hole plate. A fuel supply unit connected to the plurality of fuel nozzles and distributing fuel to each fuel nozzle;
4. The multi-nozzle burner according to claim 3, further comprising: a flexible connection unit that connects the fuel supply unit and the fuel nozzle. 5. A multi-nozzle burner according to any one of claims 1 to 4,
A combustor liner in which a flame is formed.

Images