JP2019148368A - Flame holder and combustion burner for boiler - Google Patents

Abstract

To provide a flame holder which can remove deposits, such as combustion ash, generated by combustion in a boiler furnace and adhering to the flame holder and inhibit corrosion of the flame holder caused by the deposits, and to provide a combustion burner for the boiler.SOLUTION: A flame holder includes: a flame holding member configured to hold a combustion flame which combusts in a combustion space of a boiler furnace. The flame holding member includes: at least one inlet opening; at least one outlet opening formed at the combustion space side; and at least one inner passage which communicates with the at least one inlet opening and the at least one outlet opening.SELECTED DRAWING: Figure 3

Description

  The present disclosure relates to a flame holder that holds a combustion flame that burns in a combustion space defined in a furnace of a boiler furnace, and a combustion burner for a boiler that includes the flame holder.

  Conventionally, a combustion burner for a boiler is an atomizer provided at the tip of an oil gun, in which combustion fuel supplied via the oil gun is injected into the boiler furnace, and a combustion flame is injected into the boiler furnace. Some include an atomizer to be formed and a flame holder provided around the outer periphery of the atomizer (Patent Document 1). Patent Document 1 discloses a flame holder including a conical plate whose diameter increases toward the boiler furnace side. The flame holder including the conical plate forms a vortex on the boiler furnace side of the conical plate, thereby igniting (holding flame) the combustion flame stably and continuously. Some flame holders include swirler blades that hold the combustion flame by applying a swirling flow to the air sent to the combustion flame.

  Since the flame holder located near the combustion flame generated in the boiler furnace is exposed to a high temperature environment, oxidative corrosion due to heat easily proceeds. For this reason, a metal having heat resistance and corrosion resistance is used for the flame holder.

Japanese Utility Model Publication No. 63-142520

  The fuel for combustion supplied via the oil gun is heavy oil containing a large amount of sulfur (S content), and the combustion ash produced by burning the fuel for combustion also contains sulfur. If the state where the combustion ash adheres to the flame holder continues, the flame holder may be corroded by sulfur contained in the combustion ash. Although the combustion ash adheres to the oil gun and the atomizer provided at the tip of the oil gun, the combustion ash can be easily removed because the oil gun can be inserted and removed. On the other hand, unlike the oil gun, the flame holder is not configured to be removable, and it is necessary to stop the boiler in order to remove the combustion ash adhering to the flame holder. Therefore, the conventional flame holder has a problem that removal of combustion ash is not easy.

  In view of the circumstances described above, the object of at least one embodiment of the present invention is to remove deposits such as combustion ash generated by combustion in a boiler furnace and adhering to the flame holder. It is providing the flame holder and boiler combustion burner which can suppress corrosion.

(1) A flame holder according to at least one embodiment of the present invention,
A flame holding member configured to hold a combustion flame that burns in a combustion space defined within the furnace of the boiler furnace;
The flame holding member includes at least one inlet opening, at least one outlet opening formed on the combustion space side, and at least one internal flow path communicating with the at least one inlet opening and the at least one outlet opening. And including.

  According to the configuration of (1) above, the flame holder includes the flame holding member configured to hold the combustion flame that burns in the combustion space of the boiler furnace. Combustion ash produced by combustion adheres to a flame holder that includes a flame holding member that holds the combustion flame. Combustion ash adheres mainly to the combustion space side of the flame holding member. Since the flame holding member includes an inlet opening, an outlet opening formed on the combustion space side, and an internal flow path communicating with the inlet opening and the outlet opening, a fluid such as high-pressure steam flows from the inlet opening to the internal flow. The combustion ash adhering to the flame holder, particularly the combustion ash adhering to the combustion space side of the flame-holding member, can be removed by feeding the fluid into the passage and ejecting the fluid from the outlet opening formed on the combustion space side. . Since the combustion ash contains sulfur that corrodes the flame holder, the corrosion of the flame holder can be suppressed by removing the combustion ash from the flame holder.

  In addition, the flame holding member that holds the combustion flame is provided with an inlet opening, an outlet opening, and an internal flow path for removing the combustion ash, so a new device for removing the combustion ash is added to the flame holder. There is no need to provide it. Therefore, according to said structure, the enlargement and complication of a flame holder can be prevented.

(2) In some embodiments, in the configuration of (1) above,
The at least one outlet opening includes a plurality of outlet openings formed at intervals in the circumferential direction of the flame holder.
According to the configuration of the above (2), since the plurality of outlet openings are formed at intervals in the circumferential direction of the flame holder, the outlet openings are formed at a plurality of locations in the circumferential direction of the flame holder. The fluid flowing through the internal flow path can be ejected. Therefore, according to said structure, combustion ash can be removed from a flame holder over the wide range of the circumferential direction of a flame holder.

(3) In some embodiments, in the above configuration (1) or (2),
The flame holding member is
An inner cylinder configured to be insertable with a fuel injection device for supplying fuel to the combustion space;
An annular diffuser plate extending radially from the edge of the inner cylinder on the combustion space side toward the combustion space side;
The at least one outlet opening is formed at a position such that a fluid flowing through the internal flow channel is ejected from the outlet opening toward a surface of the diffuser plate on the combustion space side.

  According to the configuration of (3) above, the flame holding member includes the inner cylinder, and an annular diffuser plate extending in the radial direction from the edge of the inner cylinder on the combustion space side toward the combustion space side. Yes. In the flame holding member including the inner cylinder and the diffuser plate described above, the combustion ash adheres mainly to the surface of the diffuser plate on the combustion space side. The at least one outlet opening is formed at such a position that the fluid flowing through the internal flow path is ejected from the outlet opening toward the combustion space side surface of the diffuser plate. By ejecting, the combustion ash adhering to the surface of the diffuser plate on the combustion space side can be removed.

(4) In some embodiments, in the configuration of (3) above,
The diffuser plate includes a bulging portion extending from the edge opposite to the edge opposite to the edge connected to the inner cylinder toward the combustion space.
The at least one outlet opening is formed in the bulging portion and has an axis along the extending direction of the diffuser plate in a cross section along the axial direction of the flame holder.

  According to the configuration of (4) above, at least one outlet opening is formed in the bulging portion extending toward the combustion space side from the edge portion on the side opposite to the edge portion connected to the inner cylinder of the diffuser plate. ing. The at least one outlet opening has an axis along the extending direction of the diffuser plate in a cross section along the axial direction of the flame holder. For this reason, the fluid flowing through the internal flow path is ejected from the outlet opening formed in the bulging portion in the extending direction of the diffuser plate along the axis of the outlet opening, so that the surface of the diffuser plate on the combustion space side Adhering combustion ash can be removed.

(5) In some embodiments, in the configuration of (3) above,
The at least one outlet opening includes a plurality of outlet openings formed on the surface of the diffuser plate on the combustion space side and spaced apart from each other in the radial direction of the flame holder.

  According to the configuration of (5) above, the plurality of outlet openings are formed on the surface of the diffuser plate on the combustion space side so as to be spaced apart from each other in the radial direction of the flame holder. The fluid which flows through an internal flow path can be ejected from the exit opening formed in several places in. Therefore, according to said structure, a combustion ash can be removed from the flame space side of a flame holder, especially a diffuser board over the wide range of the radial direction of a flame holder.

(6) In some embodiments, in the configuration of (3) above,
The at least one outlet opening is formed on the surface of the diffuser plate on the combustion space side and extends along a direction intersecting the axial direction of the flame holder.

  According to the configuration of (6) above, the internal flow path is formed from at least one outlet opening formed on the surface of the diffuser plate on the combustion space side and extending along the direction intersecting the axial direction of the flame holder. The fluid flowing through the can be ejected. Therefore, according to said structure, a combustion ash can be removed from the flame space side of a flame holder, especially a diffuser board over the wide range of the radial direction of a flame holder.

(7) In some embodiments, in the configuration of (1) or (2) above,
The flame holding member is
An inner cylinder configured to be insertable with a fuel injection device for supplying fuel to the combustion space;
An outer cylinder that is disposed so as to surround the inner cylinder and forms a gas supply path for introducing a fuel gas between the inner cylinder and the inner cylinder;
A plurality of swirler blades radially provided between the inner tube and the outer tube, the front edge portion of each of the plurality of swirler blades with respect to the rear edge portion; A plurality of swirler blades shifted by a predetermined angle on one side in the circumferential direction,
The at least one outlet opening is formed at a position such that fluid flowing through the internal flow channel is ejected from the outlet opening toward at least one surface of the swirler blade on the combustion space side.

  According to the configuration of (7) above, the flame-holding member is radially formed with an interval in the circumferential direction between the inner cylinder, the outer cylinder arranged to surround the inner cylinder, and the inner cylinder and the outer cylinder. A plurality of swirler blades provided. In the flame holding member including the inner cylinder, the outer cylinder, and the plurality of swirler blades described above, the combustion ash adheres mainly to the surface of the swirler blade on the combustion space side. The at least one outlet opening is formed at such a position that the fluid flowing through the internal flow path is ejected from the outlet opening toward the combustion space side surface of the swirler blade. By ejecting, the combustion ash adhering to the surface of the swirler blade on the combustion space side can be removed.

(8) In some embodiments, in the configuration of (7) above,
The at least one outlet opening is formed at a position closer to the combustion space than a surface of the swirler blade on the combustion space side of at least one of the inner peripheral surface of the outer cylinder and the outer peripheral surface of the inner cylinder. .

  According to the configuration of (8), the fluid flowing in the internal flow path is formed at a position closer to the combustion space than the surface on the combustion space side of the swirler blades on the inner peripheral surface of the outer cylinder and the outer peripheral surface of the inner cylinder. Moreover, the combustion ash adhering to the surface of the swirler blade on the combustion space side can be removed by ejecting from the at least one outlet opening.

(9) In some embodiments, in the configuration of (7) above,
The at least one outlet opening is formed on a surface of the at least one swirler blade on the combustion space side.

  According to the configuration of (9) above, the fluid flowing through the internal flow path is ejected from at least one outlet opening formed on the combustion space side surface of the swirler blades, so that the swirler blades on the combustion space side surface. Adhering combustion ash can be removed.

(10) In some embodiments, in the configuration of (9) above,
The at least one outlet opening includes a plurality of outlet openings formed at intervals in the radial direction of the flame holder.

  According to the configuration of (10) above, since the plurality of outlet openings are formed at intervals in the radial direction of the flame holder, the outlet openings are formed at a plurality of locations in the radial direction of the flame holder. The fluid flowing through the internal flow path can be ejected. Therefore, according to said structure, combustion ash can be removed from the flame space side of the flame holder, especially the swirler blade | wing side over the wide range of the radial direction of a flame holder.

(11) In some embodiments, in the configuration of (9) above,
The at least one outlet opening extends along a direction intersecting the axial direction of the flame holder.

  According to the configuration of (11) above, the fluid flowing through the internal flow path can be ejected from at least one outlet opening extending along the direction intersecting the axial direction of the flame holder. Therefore, according to said structure, combustion ash can be removed from the flame space side of the flame holder, especially the swirler blade | wing side over the wide range of the radial direction of a flame holder.

(12) A boiler combustion burner according to at least one embodiment of the present invention,
A flame holder described in (1) to (11) above;
A fuel injection device configured to be able to supply fuel to the combustion space.

  According to the configuration of (12) above, the flame holder includes the flame holding member configured to hold the combustion flame that burns in the combustion space of the boiler furnace. The fuel injection device is configured to be able to supply fuel to the combustion space. For this reason, the combustion flame can be held by the flame holder and the fuel injection device. Further, since the flame holding member includes an inlet opening, an outlet opening formed on the combustion space side, and an internal flow path communicating with the inlet opening and the outlet opening, the combustion ash attached to the flame holder, In particular, combustion ash adhering to the combustion space side of the flame holding member can be removed. Since the combustion ash contains sulfur that corrodes the flame holder, the corrosion of the flame holder can be suppressed by removing the combustion ash from the flame holder.

(13) In some embodiments, in the configuration of (12) above,
The apparatus further includes a fluid supply device capable of supplying a fluid containing an additive that softens ash to the at least one inlet opening of the flame holder.

  According to the configuration of (13) above, the boiler combustion burner includes the fluid supply device capable of supplying a fluid containing an additive that softens the ash to at least one inlet opening of the flame stabilizer. Combustion ash adhering to the flame holder can be effectively removed by ejecting a fluid supplied to the internal flow path by the apparatus and containing a fluid containing an additive that softens the ash from the outlet opening.

  According to at least one embodiment of the present invention, deposits such as combustion ash generated by combustion in a boiler furnace and adhering to a flame holder can be removed, and corrosion of the flame holder due to deposits can be suppressed. To provide a flame holder and a combustion burner for a boiler

It is a schematic structure figure showing roughly an example of composition of a boiler furnace provided with a combustion burner for boilers concerning one embodiment of the present invention. It is a schematic sectional drawing which shows roughly an example of a structure of the combustion burner for boilers concerning one Embodiment of this invention. It is the schematic which looked at the flame holder concerning one Embodiment of this invention from the combustion space side. It is a schematic sectional drawing of the AA 'line arrow shown in FIG. It is the schematic which looked at the flame holder concerning one Embodiment of this invention from the combustion space side. It is a schematic sectional drawing of the BB 'line arrow shown in FIG. It is the schematic which looked at the flame holder concerning one Embodiment of this invention from the combustion space side. It is a schematic sectional drawing of CC 'line arrow shown in FIG. It is the schematic which looked at the flame holder concerning one Embodiment of this invention from the combustion space side. It is a schematic sectional drawing of the DD 'line | wire arrow shown in FIG. FIG. 10 is a schematic view of the E direction shown in FIG. 9, in which an outer cylinder is omitted and a part of an internal flow path formed in the outer cylinder in order to explain the position of an outlet opening formed in the outer cylinder; It is the schematic which shows an exit opening collectively. It is the schematic which looked at the flame holder concerning one Embodiment of this invention from the combustion space side. It is the schematic of F direction view shown in FIG. 12, Comprising: It is the schematic which omits an outer cylinder. It is the schematic which looked at the flame holder concerning one Embodiment of this invention from the combustion space side.

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described in the embodiments or shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative examples. Absent.
For example, expressions expressing relative or absolute arrangements such as “in a certain direction”, “along a certain direction”, “parallel”, “orthogonal”, “center”, “concentric” or “coaxial” are strictly In addition to such an arrangement, it is also possible to represent a state of relative displacement with an angle or a distance such that tolerance or the same function can be obtained.
For example, an expression indicating that things such as “identical”, “equal”, and “homogeneous” are in an equal state not only represents an exactly equal state, but also has a tolerance or a difference that can provide the same function. It also represents the existing state.
For example, expressions representing shapes such as quadrangular shapes and cylindrical shapes represent not only geometrically strict shapes such as quadrangular shapes and cylindrical shapes, but also irregularities and chamfers as long as the same effects can be obtained. A shape including a part or the like is also expressed.
On the other hand, the expressions “comprising”, “comprising”, “comprising”, “including”, or “having” one constituent element are not exclusive expressions for excluding the existence of the other constituent elements.
In addition, about the same structure, the same code | symbol may be attached | subjected and description may be abbreviate | omitted.

  FIG. 1 is a schematic configuration diagram schematically illustrating an example of a configuration of a boiler furnace including a boiler combustion burner according to an embodiment of the present invention. As shown in FIG. 1, a boiler combustion burner 4 according to some embodiments is a hollow boiler furnace 1 having an outer peripheral wall portion extending along a vertical direction, and is defined in the furnace. It is installed in the outer peripheral wall part of the boiler furnace 1 in which the combustion space 2 is provided. As shown in FIG. 1, a plurality of boiler combustion burners 4 may be arranged on the outer periphery of the boiler furnace 1 at intervals in the circumferential direction, or may be arranged in a plurality of stages in the vertical direction. The boiler combustion burner 4 has a front end of the boiler combustion burner 4 facing the combustion space 2 through an opening 3 provided in the outer peripheral wall portion of the boiler furnace 1, and fuel and combustion air (combustion gas). ) To generate a flame in the combustion space 2 of the boiler furnace 1 and burn the fuel.

  FIG. 2 is a schematic cross-sectional view schematically showing a boiler combustion burner according to an embodiment of the present invention. As shown in FIG. 2, the boiler combustion burner 4 includes an oil gun 5 (liquid fuel burner, fuel injection device), an atomizer 6 provided at the tip of the oil gun 5 on the combustion space 2 side, A flame holder 10 having an inner cylinder 12 or an inner cylinder 22 into which the tip and the atomizer 6 can be inserted, an air box 7 disposed so as to surround the oil gun 5, the atomizer 6 and the flame holder 10, and the flame holder 10. And an air nozzle 8 disposed between the air box 7 and the air box 7.

  As shown in FIG. 2, the oil gun 5 has a fuel supply path 51 that is formed in a cylindrical shape and through which liquid fuel flows. In addition to the fuel supply pipe 53, one end of the oil gun 5 is connected to a fuel supply device 52 such as a pump capable of supplying liquid fuel to the fuel supply passage 51 at the end opposite to the side where the atomizer 6 is provided. The ends are connected, and liquid fuel such as heavy oil is sent from the fuel supply device 52. The liquid fuel is sent to the atomizer 6 through the fuel supply path 51. The atomizer 6 atomizes the liquid fuel sent from the fuel supply path 51 and injects it into the combustion space 2. When the liquid fuel is injected by the atomizer 6, it is atomized and mixed with the surrounding fuel air to form an air-fuel mixture. The air-fuel mixture is ignited by an ignition source (not shown) to form a combustion flame.

  The oil gun 5 is configured to be removable from the flame holder 10. As shown in FIG. 2, the flame holder 10 is disposed at a position surrounding the tip of the oil gun 5 and the outer periphery of the atomizer 6 when the tip of the oil gun 5 and the atomizer 6 are inserted.

  The wind box 7 is formed in a cylindrical shape, and a combustion air supply passage 71 through which fuel air flows is formed between the air box 7 and the oil gun 5. At least one combustion air supply pipe 72 is connected to the wind box 7, and combustion air is fed into the combustion air supply path 71 from the outside via the combustion air supply pipe 72. The combustion air sent into the combustion air supply passage 71 flows toward the combustion space 2 side. A part of the combustion air flowing through the combustion air supply path 71 is sent into the combustion space 2 via the flame holder 10. Another part of the combustion air flowing through the combustion air supply passage 71 is fed into the combustion space 2 through the air nozzle 8.

  3, FIG. 5 and FIG. 7 are schematic views of a flame holder according to an embodiment of the present invention as viewed from the combustion space side. 4 is a schematic cross-sectional view taken along line AA ′ shown in FIG. 6 is a schematic cross-sectional view taken along line BB ′ shown in FIG. 8 is a schematic cross-sectional view taken along the line CC ′ shown in FIG. 4, 6 and 8, for convenience of explanation, the inner cylinder 12, the diffuser plate 14 and the rib 15 are separated by a two-dot chain line, but these are integrally formed.

  A flame holder 10 (flame holders 10A to 10C) according to some embodiments shown in FIGS. 3 to 8 includes an inner cylinder 12 and a diffuser plate 14 as shown in FIGS. A flame member 11 is included. The flame holding member 11 forms an air vortex flow V (see FIG. 2) by the diffuser plate 14 in the portion of the combustion space 2 facing the surface 141 on the combustion space side of the diffuser plate 14. It is comprised so that the combustion flame which burns may be held.

  More specifically, as shown in FIGS. 4, 6, and 8, the inner cylinder 12 extends along the axial direction of the flame holder 10 (the direction in which the axis LA extends, the left-right direction in FIGS. As shown in FIG. 2, the above-described oil gun 5 can be inserted into the inner cylinder 12. As shown in FIGS. 4, 6, and 8, the diffuser plate 14 has an annular shape extending in the radial direction (the radial direction with respect to the axis LA) from the edge 121 on the combustion space side of the inner cylinder 12 toward the combustion space 2. Is formed. In other words, the diffuser plate 14 is formed in the shape of a truncated cone having a larger diameter on the combustion space 2 side than on the side away from the combustion space 2.

As shown in FIGS. 4, 6, and 8, the flame holding member 11 includes at least one inlet opening 16, at least one outlet opening 17 formed on the combustion space 2 side, at least one inlet opening 16 and at least And at least one internal flow path 18 communicating with one outlet opening 17. Here, the “combustion space 2 side” in the flame holders 10 </ b> A to 10 </ b> C is the surface 141 of the diffuser plate 14 on the combustion space side or a surface or part continuous with the surface 141, and the combustion space side of the inner cylinder 12. The combustion space 2 side is referred to with respect to the edge 121.
In the embodiment shown in FIGS. 4, 6, and 8, the inlet opening 16 is formed in the edge 122 on the side opposite to the edge 121 on the combustion space side of the inner cylinder 12. The outlet opening 17 is formed in the diffuser plate 14. The internal flow path 18 is formed inside the inner cylinder 12 and the diffuser plate 14. In another embodiment, the inlet opening 16 may be formed on the surface of the diffuser plate 14 on the side opposite to the surface 141 on the combustion space side, and the outlet opening 17 is the edge of the inner cylinder 12 on the combustion space side. 121 may be formed. Further, the internal flow path 18 may be formed inside either the inner cylinder 12 or the diffuser plate 14.

  As shown in FIG. 4, the inlet opening 16 is connected to the other end of a fluid supply pipe 32 having one end connected to a fluid supply device 31 such as a pump capable of supplying fluid to the inlet opening 16 to supply fluid. A fluid such as high-pressure steam is sent from the device 31. The fluid sent from the fluid supply device 31 to the inlet opening 16 passes through the internal flow path 18 and is ejected from the outlet opening 17.

  As described above, the flame holder 10 according to some embodiments includes the flame holding member 11 including the inlet opening 16, the outlet opening 17, and the internal flow path 18 described above.

  According to the above configuration, the flame holder 10 includes the flame holding member 11 configured to hold the combustion flame combusted in the combustion space 2 of the boiler furnace 1. Combustion ash generated by combustion adheres to the flame holder 10 including the flame holding member 11 that holds the combustion flame. The combustion ash adheres mainly to the combustion space 2 side of the flame holding member 11. Since the flame-holding member 11 includes the inlet opening 16, the outlet opening 17 formed on the combustion space 2 side, and the inner passage 18 communicating with the inlet opening 16 and the outlet opening 17, the high-pressure steam or the like The fluid is sent from the inlet opening 16 to the internal flow path 18 and is ejected from the outlet opening 17 formed on the combustion space 2 side, whereby the combustion ash adhering to the flame holder 10, particularly the combustion of the flame holding member 11 is burned. The combustion ash adhering to the space 2 side can be removed. Since the combustion ash contains sulfur that corrodes the flame holder 10, removing the combustion ash from the flame holder 10 can suppress the corrosion of the flame holder 10.

  Further, the flame holding member 11 that holds the combustion flame is provided with the inlet opening 16, the outlet opening 17, and the internal flow path 18 for removing the combustion ash, so the combustion ash is removed from the flame holder 10. It is not necessary to newly provide a device for this. Therefore, according to said structure, the enlargement and complication of the flame holder 10 can be prevented.

  In some embodiments, the above-described flame stabilizer 10 (flame holders 10A to 10C) further includes at least one rib 15 and an outer cylinder 13, as shown in FIGS. As shown in FIGS. 4, 6, and 8, the outer cylinder 13 is formed in a cylindrical shape that extends along the axial direction of the flame holder 10. The outer cylinder 13 is formed to be shorter in the axial direction than the inner cylinder 12 and is disposed so as to surround the outer periphery of the edge 121 on the combustion space side of the inner cylinder 12. Further, the outer cylinder 13 is disposed on the side farther from the combustion space 2 than the outer peripheral edge of the diffuser plate 14 in the axial direction.

  As shown in FIGS. 3, 5, and 7, the rib 15 is formed in a plate shape that extends along the radial direction from the outer peripheral surface of the inner cylinder 12. In the embodiment shown in FIGS. 3, 5, and 7, a plurality of ribs 15 are arranged at intervals in the circumferential direction (the circumferential direction with respect to the axis LA). Further, as shown in FIGS. 4, 6, and 8, the rib 15 is provided integrally with the inner cylinder 12, the outer cylinder 13, and the diffuser plate 14.

  The flame holder 10 (flame holders 10 </ b> A to 10 </ b> C) is a combustion air flow path through which combustion air (combustion gas) passes outside the outer peripheral surface of the inner cylinder 12 by the inner cylinder 12, the outer cylinder 13 and the rib 15. 101 (gas supply path) is formed. Combustion air enters the combustion air flow path 101 from the side farther from the combustion space 2 than the outer cylinder 13 of the flame holder 10. Since the combustion air flow path 101 is divided into a plurality of sections in the circumferential direction by the rib 15, the combustion air flowing through the combustion air flow path 101 is rectified by the rib 15.

  In some embodiments, the flame holder 10 (flame holders 10A to 10C) described above includes the edge 121 on the combustion space side of the inner cylinder 12 and the diffuser plate, as shown in FIGS. An inner peripheral side opening 102 is formed between the inner peripheral side edge 142 which is an edge connected to the 14 inner cylinders 12. A part of the combustion air flowing through the combustion air flow path 101 passes through the inner peripheral side opening 102, goes around the inner peripheral side of the diffuser plate 14, flows into the combustion space 2, and holds the combustion flame. Combustion air flowing into the combustion space 2 from the inner peripheral side of the diffuser plate 14 is used for combustion, so that ignition (flame holding) stability of the combustion flame is improved.

  In some embodiments, the above-described flame holder 10 (flame holders 10A to 10C) is opposite to the inner peripheral side edge 142 of the diffuser plate 14, as shown in FIGS. An outer peripheral side opening 103 is formed between the outer peripheral side edge 143 that is the side edge and the outer cylinder 13. A part of the combustion air flowing through the combustion air flow path 101 passes through the outer peripheral side opening 103, goes around the outer peripheral side of the diffuser plate 14, flows into the combustion space 2, and holds the combustion flame. Combustion air that flows into the combustion space 2 from the outer peripheral side of the diffuser plate 14 forms a vortex V (see FIG. 2) on the combustion space 2 side of the surface 141 on the combustion space side. By forming the vortex V, the ignition (flame holding) stability of the combustion flame is enhanced.

  In some embodiments, as shown in FIGS. 3, 5, 7, the at least one outlet opening 17 is a plurality of outlet openings formed at intervals in the circumferential direction of the flame holder 10. 17. In this case, since the plurality of outlet openings 17 are formed at intervals in the circumferential direction of the flame holder 10, from the outlet openings 17 formed at a plurality of locations in the circumferential direction of the flame holder 10, The fluid flowing through the internal flow path 18 can be ejected. Therefore, according to said structure, combustion ash can be removed from the flame holder 10 over the wide range of the circumferential direction of the flame holder 10.

  In some embodiments, the flame holding member 11 described above includes the inner cylinder 12 described above and the diffuser plate 14 described above. The outlet opening 17 described above is such that the fluid flowing through the internal flow path 18 is ejected from the outlet opening 17 toward the combustion space side surface 141 of the diffuser plate 14 as shown in FIGS. Formed in position. Here, “spouting toward the surface 141 on the combustion space side of the diffuser plate 14” means not only jetting from a direction orthogonal to or intersecting with the surface 141 on the combustion space side, but also on the combustion space side. And jetting from a direction along the in-plane direction of the surface 141 on the combustion space side.

  According to the above configuration, the flame holding member 11 includes the inner cylinder 12, the annular diffuser plate 14 that extends in the radial direction from the edge 121 on the combustion space side of the inner cylinder 12 toward the combustion space 2 side, Is included. In the flame holding member 11 including the inner cylinder 12 and the diffuser plate 14 described above, the combustion ash adheres mainly to the surface 141 of the diffuser plate 14 on the combustion space side. The at least one outlet opening 17 is formed at a position where fluid flowing through the internal flow path 18 is ejected from the outlet opening 17 toward the combustion space side surface 141 of the diffuser plate 14. By ejecting the flowing fluid from the outlet opening 17, the combustion ash adhering to the surface 141 on the combustion space side of the diffuser plate 14 can be removed.

  In some embodiments, the flame holder 10 described above is a flame holder 10A as shown in FIGS. As shown in FIGS. 3 and 4, the diffuser plate 14 described above in the flame holder 10 </ b> A has an edge (outer peripheral edge) opposite to the edge (inner peripheral edge 142) connected to the inner cylinder 12. Part 143) and a bulging part 144 extending toward the combustion space 2 side. The above-described at least one outlet opening 17 is formed in the bulging portion 144 and has an outlet opening 17A having an axis LE along the extending direction of the diffuser plate 14 in a cross section along the axial direction of the flame holder 10. It is. In the embodiment shown in FIG. 4, the outlet opening 17 </ b> A is a surface 145 that is located on the inner peripheral side of the bulging portion 144 and extends along a direction orthogonal to the surface 141 on the combustion space side of the diffuser plate 14. Thus, it is formed on a surface 145 continuous with the surface 141 on the combustion space side. In the embodiment shown in FIG. 4, the internal flow path 18 is an internal flow path 18 </ b> A having an arcuate portion 181 that communicates with the outlet opening 17 </ b> A in a cross section along the axial direction of the flame holder 10.

  According to said structure, it is toward the combustion space 2 side from the edge part (outer peripheral side edge part 143) on the opposite side to the edge part (inner peripheral side edge part 142) connected to the inner cylinder 12 of the diffuser board 14. FIG. At least one outlet opening 17 </ b> A is formed in the extended bulging portion 144. At least one outlet opening 17 </ b> A has an axis LE along the extending direction of the diffuser plate 14 in a cross section along the axial direction of the flame holder 10. Therefore, the diffuser plate 14 is ejected from the outlet opening 17A formed in the bulging portion 144 in the extending direction of the diffuser plate 14 along the axis LE of the outlet opening 17A. It is possible to remove the combustion ash adhering to the surface 141 on the combustion space side.

  In some embodiments, the flame holder 10 described above is a flame holder 10B as shown in FIGS. As shown in FIGS. 5 and 6, the outlet opening 17 described above in the flame holder 10 </ b> B is an outlet opening 17 </ b> B formed in the surface 141 on the combustion space side of the diffuser plate 14. A plurality of outlet openings 17 </ b> B are formed at intervals in the radial direction of the flame holder 10. In the embodiment shown in FIG. 6, the outlet opening 17 </ b> B has the axis LE of the outlet opening 17 </ b> B orthogonal to the combustion space side surface 141 of the diffuser plate 14, but in other embodiments, the outlet opening 17 </ b> B The axis line LE of the outlet opening 17B may intersect the surface 141 of the plate 14 on the combustion space side. In the embodiment shown in FIG. 6, the internal flow path 18 is an internal flow path 18 </ b> B communicated with a plurality of outlet openings 17 </ b> B arranged in the radial direction. In this case, the plurality of outlet openings 17 </ b> B are formed on the surface 141 of the diffuser plate 14 on the combustion space side so as to be spaced from each other in the radial direction of the flame holder 10. The fluid flowing through the internal flow path 18 can be ejected from the outlet openings 17B formed at a plurality of locations. Therefore, according to the above configuration, combustion ash can be removed from the flame holder 10, particularly the surface 141 on the combustion space side of the diffuser plate 14 over a wide range in the radial direction of the flame holder 10.

  In some embodiments, the flame holder 10 described above is a flame holder 10C as shown in FIGS. As shown in FIGS. 7 and 8, the above-described outlet opening 17 in the flame holder 10 </ b> C is an outlet opening 17 </ b> C formed in the surface 141 on the combustion space side of the diffuser plate 14. The outlet opening 17 </ b> C extends along a direction intersecting the axial direction of the flame holder 10. The internal flow path 18 is an internal flow path 18C that communicates with the outlet opening 17C. In the embodiment shown in FIG. 7, the outlet opening 17C extends along the radial direction. In this case, the internal flow path 18 is formed from at least one outlet opening 17 </ b> C formed on the surface 141 on the combustion space side of the diffuser plate 14 and extending along the direction intersecting the axial direction of the flame holder 10. The fluid flowing through the can be ejected. Therefore, according to the above configuration, combustion ash can be removed from the flame holder 10, particularly the surface 141 on the combustion space side of the diffuser plate 14 over a wide range in the radial direction of the flame holder 10.

  Each of FIG. 9, FIG. 12 and FIG. 14 is a schematic view of a flame holder according to an embodiment of the present invention as viewed from the combustion space side. FIG. 10 is a schematic cross-sectional view taken along line DD ′ shown in FIG. FIG. 11 is a schematic view as viewed in the E direction shown in FIG. 9, in which the outer cylinder is omitted, and the internal flow path formed in the outer cylinder for explaining the position of the outlet opening formed in the outer cylinder It is the schematic which shows a part of and the exit opening collectively. In FIG. 11, for convenience of explanation, a part of the internal flow path 28 </ b> A and the outlet opening 27 </ b> A formed in the outer cylinder 23 omitted in the drawing are indicated by a two-dot chain line. FIG. 13 is a schematic view in the F direction shown in FIG. 12, and is a schematic view in which an outer cylinder is omitted. 10, 11, and 13, for convenience of explanation, some swirler blades are omitted.

  9 to 14, flame holders 10 (flame holders 20 </ b> A to 20 </ b> C) according to some embodiments include an inner cylinder 22, an outer cylinder 23, and a plurality of cylinders as illustrated in FIGS. A flame holding member 21 including a swirler blade 24 is included. The flame holding member 21 forms a swirler flow (swirl flow) by the swirler blades 24 on the combustion space 2 side of the surface 241 on the combustion space side of the swirler blades 24, thereby maintaining the combustion flame that burns in the combustion space 2. It is configured to burn.

  More specifically, as shown in FIG. 10, the inner cylinder 22 and the outer cylinder 23 are formed in a cylindrical shape that extends along the axial direction of the flame holder 10. Similar to the inner cylinder 12 shown in FIG. 2, the inner cylinder 22 is configured such that the oil gun 5 described above can be inserted into the inner cylinder 22. As shown in FIG. 10, the outer cylinder 23 is disposed so as to surround the outer periphery of the inner cylinder 22, and combustion air for introducing combustion air (combustion gas) between the outer cylinder 23 and the inner cylinder 22. A flow path 201 (gas supply path) is formed. Combustion air is fed into the combustion air passage 201 from the side away from the combustion space 2 in the axial direction.

  As shown in FIGS. 9, 12, and 14, the plurality of swirler blades 24 are provided radially between the inner cylinder 22 and the outer cylinder 23 at intervals in the circumferential direction. In each of the plurality of swirler blades 24, as shown in FIGS. 11 and 13, the front edge portion 242 is shifted from the rear edge portion 243 by one angle in the circumferential direction. In the embodiment shown in FIGS. 9, 12, and 14, the plurality of swirler blades 24 are provided integrally with the inner cylinder 22 and the outer cylinder 23. Since the combustion air flow path 201 is divided into a plurality of sections in the circumferential direction by the plurality of swirler blades 24, the combustion air that flows through the clearance between the plurality of swirler blades 24 through the combustion air flow path 201. A swirler flow (swirl flow) is formed by the plurality of swirler blades 24. Since the swirler flow flows into the combustion space 2 and holds the combustion flame, the ignition (flame holding) stability of the combustion flame is improved.

  As shown in FIGS. 10, 11, and 13, the flame holding member 21 includes at least one inlet opening 26, at least one outlet opening 27 formed on the combustion space 2 side, at least one inlet opening 26 and at least And at least one internal flow path 28 communicating with one outlet opening 27. Here, the “combustion space 2 side” in the flame holders 20 </ b> A to 20 </ b> C is the surface 241 on the combustion space side of the swirler blade 24 or a surface or a portion continuous with the surface 241, and from the swirler blade 24 in the axial direction. Also, the side away from the combustion space 2 is excluded. In the embodiment shown in FIGS. 10, 11, and 13, the inlet opening 26 is formed in the edge portion 222 on the side away from the combustion space of the inner cylinder 22, but in other embodiments, the inlet opening 26 is The outer cylinder 23 may be formed on the edge 232 of the inner cylinder 22 away from the combustion space, the surface 244 opposite to the combustion space side surface 241 of the swirler blade, or the like.

  Similar to the inlet opening 16 shown in FIG. 4, the inlet opening 26 has a fluid supply pipe having one end connected to a fluid supply device 31 such as a pump capable of supplying fluid to the inlet opening 26 as shown in FIG. 10. The other end of 32 is connected, and a fluid such as high-pressure steam is sent from the fluid supply device 31. The fluid sent from the fluid supply device 31 to the inlet opening 26 passes through the internal flow path 28 and is ejected from the outlet opening 27.

  As described above, the flame holder 10 (flame holders 20A to 20C) according to some embodiments is similar to the flame holder 11 including the inlet opening 16, the outlet opening 17, and the internal flow path 18 described above. The flame holding member 21 including the above-described inlet opening 26, outlet opening 27, and internal flow path 28 is included. In this case, the flame holding member 21 includes the inlet opening 26, the outlet opening 27 formed on the combustion space 2 side, and the internal passage 28 communicating with the inlet opening 26 and the outlet opening 27. The combustion ash adhering to the flame holder 10, particularly the combustion ash adhering to the combustion space 2 side of the flame holder 21 can be removed, and corrosion of the flame holder 10 can be suppressed. Moreover, according to said structure, the enlargement and complication of the flame holder 10 can be prevented.

  In some embodiments, as shown in FIGS. 9, 12, and 14, at least one outlet opening 27 described above is spaced from one another in the circumferential direction of the flame holder 10 (flame holders 20A-20C). A plurality of outlet openings 27 are formed. In this case, since the plurality of outlet openings 27 are formed at intervals in the circumferential direction of the flame holder 10, from the outlet openings 27 formed at a plurality of locations in the circumferential direction of the flame holder 10, The fluid flowing through the internal flow path 28 can be ejected. Therefore, according to said structure, combustion ash can be removed from the flame holder 10 over the wide range of the circumferential direction of the flame holder 10.

  In some embodiments, the flame holding member 21 described above includes the inner cylinder 22 described above, the outer cylinder 23 described above, and the swirler blades 24 described above. 9 to 14, the outlet opening 27 described above causes the fluid flowing through the internal flow path 28 to be ejected from the outlet opening 27 toward the surface 241 on the side of at least one combustion space of the swirler blade 24. It is formed in the position. Here, “spouting toward the surface 241 on the combustion space side of the swirler blades 24” not only refers to ejection from a direction perpendicular to or intersecting the surface 241 on the combustion space side, but also on the combustion space side. This includes ejecting from the direction along the in-plane direction of the surface 241 on the combustion space side with respect to the surface 241.

  According to the above configuration, the flame holding member 21 is spaced in the circumferential direction between the inner cylinder 22, the outer cylinder 23 disposed so as to surround the inner cylinder 22, and the inner cylinder 22 and the outer cylinder 23. And a plurality of swirler blades 24 provided radially. In the flame holding member 21 including the inner cylinder 22, the outer cylinder 23, and the plurality of swirler blades 24 described above, the combustion ash adheres mainly to the surface 241 on the combustion space side of the swirler blade 24. The at least one outlet opening 27 is formed at such a position that fluid flowing through the internal flow path 28 is ejected from the outlet opening 27 toward the surface 241 on the combustion space side of the swirler blade 24. By ejecting the flowing fluid from the outlet opening 27, the combustion ash adhering to the surface 241 of the swirler blade 24 on the combustion space side can be removed.

  In some embodiments, the at least one outlet opening 27 described above is at least one of the inner peripheral surface 231 of the outer cylinder 23 and the outer peripheral surface 221 of the inner cylinder 22 than the surface 241 on the combustion space side of the swirler blade 24. Is an outlet opening 27A formed at a position on the combustion space 2 side. In the embodiment shown in FIGS. 9 to 11, the above-described flame holder 10 is the flame holder 20A shown in FIGS. The above-described at least one outlet opening 27 in the flame stabilizer 20 </ b> A is formed at a position closer to the combustion space 2 than the surface 241 on the combustion space side of the swirler blade 24 on the inner peripheral surface 231 of the outer cylinder 23. . In the embodiment shown in FIGS. 9 to 11, the internal flow path 28 is an internal flow path 28 </ b> A formed in the inner cylinder 22, the outer cylinder 23, or the swirler blade 24. In other embodiments, the internal flow path 28 may be formed in only one of the inner cylinder 22 and the outer cylinder 23. In the embodiment shown in FIGS. 9 to 11, the axis LE of the outlet opening 27 </ b> A is orthogonal to the inner peripheral surface 231 of the outer cylinder 23, but intersects the inner peripheral surface 231 of the outer cylinder 23. You may do it. Further, the axis LE of the outlet opening 27A may be along the in-plane direction of the swirler blade 24.

  According to the above configuration, the fluid flowing through the internal flow path 28 </ b> A causes the inner circumferential surface 231 of the outer cylinder 23 and the outer circumferential surface 221 of the inner cylinder 22 to be closer to the combustion space 2 than the surface 241 of the swirler blade 24 on the combustion space side. By ejecting from at least one outlet opening 27 </ b> A formed at the position, combustion ash adhering to the surface 241 on the combustion space side of the swirler blades 24 can be removed.

  In some embodiments, the at least one outlet opening 27 described above is formed as an outlet opening 27 (outlet) formed in a combustion space side surface 241 of at least one swirler blade 24, as shown in FIGS. Openings 27B and 27C). In the embodiment shown in FIGS. 12 to 14, a plurality of outlet openings 27 </ b> B and 27 </ b> C are formed for one swirler blade 24. In the embodiment shown in FIG. 13, the axis LE of the outlet opening 27 </ b> B is orthogonal to the surface 241 on the combustion space side of the swirler blade 24, but even if it intersects the surface 241 on the combustion space side. Good. The same applies to the axis of the outlet opening 27C. In this case, the fluid flowing through the internal flow path 28 is ejected from at least one outlet opening 27 formed in the combustion space-side surface 241 of the swirler blade 24, so that the combustion space-side surface 241 of the swirler blade 24. Combustion ash adhering to can be removed.

  In some embodiments, as shown in FIG. 12, the at least one outlet opening 27 described above is a plurality of outlets formed at intervals in the radial direction of the flame holder 10 (flame holder 20B). An opening 27B is included. In this case, since the plurality of outlet openings 27 are formed at intervals in the radial direction of the flame holder 10, from the outlet openings 27 formed at a plurality of locations in the radial direction of the flame holder 10, The fluid flowing through the internal flow path 28 can be ejected. Therefore, according to the above configuration, the combustion ash can be removed from the flame holder 10, particularly the surface 241 on the combustion space side of the swirler blade 24 over a wide range in the radial direction of the flame holder 10.

  In some embodiments, the at least one outlet opening 27 described above extends along a direction intersecting the axial direction of the flame holder 10 (flame holder 20C), as shown in FIG. In the embodiment shown in FIG. 14, the outlet opening 27 </ b> C (exit opening 27) extends along the radial direction. In this case, the fluid flowing through the internal flow path 28 can be ejected from at least one outlet opening 27 extending along the direction intersecting the axial direction of the flame holder 10. Therefore, according to the above configuration, the combustion ash can be removed from the flame holder 10, particularly the surface of the swirler blade 24 on the combustion space side over a wide range in the radial direction of the flame holder 10.

  In some embodiments, the above-described boiler combustion burner 4 includes the above-described flame holder 10 and the above-described oil gun 5, as shown in FIG. In this case, the flame holder 10 includes flame holding members 11 and 21 configured to hold a combustion flame combusted in the combustion space 2 of the boiler furnace 1. The oil gun 5 is configured to be able to supply fuel to the combustion space 2. For this reason, the combustion flame can be held by the flame holder 10 and the oil gun 5. In addition, the flame holding members 11 and 21 include the inlet openings 16 and 26, the outlet openings 17 and 27 formed on the combustion space 2 side, and the internal flow path 18 that communicates with the inlet openings 16 and 26 and the outlet openings 17 and 27. 28, the combustion ash adhering to the flame holder 10, particularly the combustion ash adhering to the combustion space 2 side of the flame holding members 11 and 21 can be removed. Since the combustion ash contains sulfur that corrodes the flame holder 10, removing the combustion ash from the flame holder 10 can suppress the corrosion of the flame holder 10.

  In some embodiments, the boiler combustion burner 4 described above can supply a fluid containing an additive that softens ash to at least one inlet opening 16, 26 of the flame holder 10, as shown in FIG. The above-described fluid supply device 31 is further provided. In this case, the combustion burner 4 for the boiler includes a fluid supply device 31 that can supply a fluid containing an additive that softens ash to at least one inlet opening 16, 26 of the flame stabilizer 10. Combustion adhering to the flame holders 10 and 20 by ejecting the fluid supplied to the internal flow paths 18 and 28 by the supply device 31 and containing the additive that softens the ash from the outlet openings 17 and 27. Ashes can be effectively removed.

  In some embodiments described above, as shown in FIGS. 4 and 10, a regulating valve 33 (fluid flow control device) is provided in the middle of the fluid supply pipe 32. The control valve 33 is configured to be able to adjust the flow rate of the fluid supplied to the internal flow paths 18 and 28. In this case, during the operation of the boiler furnace 1 and the boiler combustion burner 4, the control valve 33 is closed so that no fluid is ejected from the outlet openings 17 and 27, and the boiler furnace 1 and the boiler combustion burner 4 are During the stop, the control valve 33 can be opened to eject the fluid from the outlet openings 17 and 27. It can suppress that the operating efficiency of the boiler furnace 1 and the combustion burner 4 for boilers falls by the fluid which ejects from the exit openings 17 and 27. FIG.

  In some embodiments described above, the flame holder 10 is manufactured by a three-dimensional printer. Since the conventional flame holder is manufactured by sheet metal processing or casting, it has been difficult to form a shape having an internal flow path. However, by manufacturing the flame holder 10 with a three-dimensional printer, an internal flow can be obtained. It can be formed into a shape having the paths 18 and 28.

  In some embodiments described above, the fuel injection device that injects fuel into the combustion space 2 included in the boiler combustion burner 4 described above is an oil gun 5 (liquid combustion burner) that injects and burns liquid fuel. However, the fuel injection device includes a gas burner that injects and burns gaseous fuel (combustion gas) and a pulverized coal burner that injects and burns solid fuel such as coal. Moreover, you may apply the flame holder 10 mentioned above to the combustion burner 4 for boilers provided with a gas burner or a pulverized coal burner.

  The present invention is not limited to the above-described embodiments, and includes forms obtained by modifying the above-described embodiments and forms obtained by appropriately combining these forms.

DESCRIPTION OF SYMBOLS 1 Boiler furnace 2 Combustion space 3 Opening 4 Boiler combustion burner 5 Oil gun (fuel injection device)
6 Atomizer 7 Air box 8 Air nozzle 10, 10 A to 10 C, 20 A to 20 C Flame holder 11 Flame holding member 12 Inner cylinder 13 Outer cylinder 14 Diffuser plate 141 Surface 15 on the combustion space side Rib 16 Inlet opening 17 Outlet opening 18 Internal flow Path 21 Flame-holding member 22 Inner cylinder 23 Outer cylinder 24 Swirler blade 241 Combustion space side surface 26 Inlet opening 27 Outlet opening 28 Internal flow path 31 Fluid supply device 32 Fluid supply pipe 33 Control valve 51 Fuel supply path 52 Fuel supply device 53 Fuel supply pipe 71 Combustion air supply path 72 Combustion air supply pipe 101, 201 Combustion air flow path LA Flame stabilizer axis LE Axis V of outlet opening V Vortex

Claims (13)

A flame holding member configured to hold a combustion flame that burns in a combustion space defined within the furnace of the boiler furnace;
The flame holding member includes at least one inlet opening, at least one outlet opening formed on the combustion space side, and at least one internal flow path communicating with the at least one inlet opening and the at least one outlet opening. And a flame holder.   The flame holder according to claim 1, wherein the at least one outlet opening includes a plurality of outlet openings formed at intervals in a circumferential direction of the flame holder. The flame holding member is
An inner cylinder configured to be insertable with a fuel injection device for supplying fuel to the combustion space;
An annular diffuser plate extending radially from the edge of the inner cylinder on the combustion space side toward the combustion space side;
The at least one outlet opening is formed at a position where fluid flowing through the internal flow channel is ejected from the outlet opening toward a surface of the diffuser plate on the combustion space side. Flame holder. The diffuser plate includes a bulging portion extending toward the combustion space side from an edge portion opposite to an edge portion connected to the inner cylinder,
The at least one outlet opening is formed in the bulging portion, and has an axis along the extending direction of the diffuser plate in a cross section along the axial direction of the flame holder. Flame holder.   4. The flame holding according to claim 3, wherein the at least one outlet opening includes a plurality of outlet openings formed on the surface of the diffuser plate on the combustion space side and spaced apart from each other in the radial direction of the flame holder. vessel.   The flame holder according to claim 3, wherein the at least one outlet opening is formed on a surface of the diffuser plate on the combustion space side and extends along a direction intersecting an axial direction of the flame holder. . The flame holding member is
An inner cylinder configured to be insertable with a fuel injection device for supplying fuel to the combustion space;
An outer cylinder that is disposed so as to surround the inner cylinder and forms a gas supply path for introducing a fuel gas between the inner cylinder and the inner cylinder;
A plurality of swirler blades radially provided between the inner tube and the outer tube, the front edge portion of each of the plurality of swirler blades with respect to the rear edge portion; A plurality of swirler blades shifted by a predetermined angle on one side in the circumferential direction,
The at least one outlet opening is formed at a position where fluid flowing through the internal flow channel is ejected from the outlet opening toward at least one surface of the swirler blade on the combustion space side. The flame holder described in 1.   The at least one outlet opening is formed at a position closer to the combustion space than a surface of the swirler blade on the combustion space side of at least one of the inner peripheral surface of the outer cylinder and the outer peripheral surface of the inner cylinder. The flame holder according to claim 7.   The flame holder according to claim 7, wherein the at least one outlet opening is formed on a surface of the at least one swirler blade on the combustion space side.   The flame holder according to claim 9, wherein the at least one outlet opening includes a plurality of outlet openings formed at intervals in a radial direction of the flame holder.   The flame holder according to claim 9, wherein the at least one outlet opening extends along a direction intersecting an axial direction of the flame holder. A flame holder according to any one of claims 1 to 11,
A boiler combustion burner comprising: a fuel injection device configured to be able to supply fuel to the combustion space.   The boiler combustion burner according to claim 12, further comprising a fluid supply device capable of supplying a fluid containing an additive that softens ash to the at least one inlet opening of the flame stabilizer.

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