JP7592452B2 - Burner, boiler, power generation plant, and burner assembly method - Google Patents

Description

This disclosure relates to a burner, a boiler, a power generation plant, and a method for assembling a burner.

Large boilers used in power plants and the like have a hollow furnace that is installed vertically, and multiple burners are arranged on the furnace wall along the circumferential direction of the furnace. The boiler also has a flue connected vertically above the furnace, and a heat exchanger for generating steam is arranged in this flue. The burner then injects a mixture of fuel and air (oxidizing gas) into the furnace to form a flame, generating combustion gas that flows into the flue. A heat exchanger is installed in the area where the combustion gas flows, and superheated steam is generated by heating the water and steam flowing inside the heat transfer tubes that make up the heat exchanger.

For example, as disclosed in Patent Documents 1 and 2, some burners used in boilers have a burner body and a burner nozzle, and the burner nozzle is connected to the burner body so that the angle can be adjusted. In this type of burner, a mixture of fuel and primary air flows inside the burner body, and high-temperature secondary air flows outside the burner body. In addition to the burner body and burner nozzle, this type of burner also has a seal plate that fills the gap between the burner body and the burner nozzle, and is configured to prevent the mixture containing fuel from leaking from the gap into the secondary air.

JP 2004-278838 A Japanese Patent Application Publication No. 11-281009

However, in the burners disclosed in Patent Documents 1 and 2, there is no direct contact between the seal plate and the burner nozzle, and between the seal plate and the burner body. As a result, there are small gaps between the seal plate and the burner nozzle, and between the seal plate and the burner body, which may not reliably reduce leakage of the fuel-containing mixture.

The present disclosure has been made in consideration of these circumstances, and aims to provide a burner, boiler, power plant, and burner assembly method that can seal the gap between the burner body and the burner nozzle.

In order to solve the above problems, the burner, boiler, power plant, and fuel burner assembly method of the present disclosure employ the following means.
That is, a burner according to one aspect of the present disclosure comprises a cylindrical burner body through which a mixed gas containing fuel flows, and a cylindrical burner nozzle which surrounds the open end side of the burner body located downstream in the flow direction of the mixed gas and is connected to the burner body so that the angle can be adjusted, and which guides the mixed gas flowing out from the open end of the burner body into a furnace, and the burner nozzle has a plate-shaped member which is provided upstream of the burner nozzle in the flow direction of the mixed gas and which elastically contacts the outer peripheral surface of the burner body.

Furthermore, a boiler according to one aspect of the present disclosure is equipped with the burner described above.

A power generation plant according to one aspect of the present disclosure includes the above-mentioned boiler and a power generation unit that generates power using steam generated by the boiler.

In addition, a method for assembling a burner according to one aspect of the present disclosure is a method for assembling a burner comprising a cylindrical burner body through which a mixed gas containing fuel flows, a cylindrical burner nozzle that is connected to the burner body at an open end side of the burner body located downstream in the flow direction of the mixed gas so as to be angle-adjustable and that directs the mixed gas flowing out from the open end into the furnace, and a plate-shaped member that elastically contacts the outer peripheral surface of the burner body, and includes a step of providing the plate-shaped member to the burner nozzle.

According to the present disclosure, it is possible to seal the gap between the burner body and the burner nozzle.

1 is a schematic configuration diagram of a boiler according to a first embodiment. FIG. FIG. 2 is a partial enlarged view (longitudinal cross-sectional view) of the vicinity of the open end of the burner according to the first embodiment. 3 is a vertical cross-sectional view taken along line III-III shown in FIG. 2. FIG. 2 is a front view of the burner according to the first embodiment, seen from the open end side. FIG. 3 is a vertical cross-sectional view showing a state in which the burner nozzle shown in FIG. 2 is angle-adjusted upward. FIG. 3 is a vertical cross-sectional view showing a state in which the burner nozzle shown in FIG. 2 is angle-adjusted downward. FIG. 2 is a perspective view of a sealing plate according to the first embodiment. FIG. 11 is a perspective view of a sealing plate according to a modified example of the first embodiment. FIG. 11 is a front view of a burner according to a modified example of the first embodiment, as viewed from the open end side. FIG. 11 is a vertical cross-sectional view showing a state in which a burner nozzle according to a modified example of the first embodiment is angle-adjusted upward.

[About the boiler]
First, the configuration of the boiler will be described.
FIG. 1 is a schematic diagram showing the configuration of a boiler according to the present embodiment.
The boiler 10 is a pulverized coal-fired boiler that uses pulverized coal made by crushing coal (carbon-containing solid fuel) as pulverized fuel, burns this pulverized fuel using a burner (pulverized fuel burner), and exchanges the heat generated by this combustion with feed water or steam to generate superheated steam.

The boiler 10 is provided in a power generation plant equipped with a power generation unit. The power generation unit includes, for example, a steam turbine and a generator that is rotationally driven by the steam turbine. The steam generated by the boiler 10 is supplied to the steam turbine provided in the power generation plant to rotate the steam turbine. The steam turbine then rotates the generator to generate electricity.

As shown in FIG. 1, the boiler 10 has a furnace 11, a combustion device 12, and a combustion gas passage 13. The furnace 11 has a hollow rectangular cylinder shape and is installed vertically. The furnace wall 101 that constitutes the furnace 11 is composed of multiple heat transfer tubes and fins that connect them, and exchanges heat generated by the combustion of pulverized fuel with water and steam flowing inside the heat transfer tubes, suppressing the temperature rise of the furnace wall.

The combustion device 12 is provided on the lower side of the furnace wall that constitutes the furnace 11. In this embodiment, the combustion device 12 has multiple burners (e.g., 21, 22, 23, 24, 25) attached to the furnace wall. The burners 21, 22, 23, 24, 25 are arranged at equal intervals along the circumferential direction of the furnace 11 as one set, and are arranged in multiple stages (e.g., five stages in FIG. 1) along the vertical direction. However, the shape of the furnace 11 and the number, number of stages, arrangement, etc. of burners in one stage are not limited to this embodiment.

The burners 21, 22, 23, 24, 25 are connected to a number of pulverizers (mills) 31, 32, 33, 34, 35 via pulverized fuel supply pipes 26, 27, 28, 29, 30. The pulverizers 31, 32, 33, 34, 35 are configured, for example, such that a pulverizer table (not shown) is supported in the housing of the pulverizer so that it can be driven and rotated, and a number of pulverizer rollers (not shown) are supported above the pulverizer table so that they can rotate in conjunction with the rotation of the pulverizer table. When coal is fed between the multiple pulverizer rollers and the pulverizer table, it is pulverized and transported by a carrier gas (primary air, oxidizing gas) to a classifier (not shown) in the housing of the pulverizer, and the pulverized fuel classified to a predetermined particle size range can be supplied to the burners 21, 22, 23, 24, 25 from the pulverized fuel supply pipes 26, 27, 28, 29, 30.

Furnace 11 is also provided with a wind box 36 at the mounting positions of burners 21, 22, 23, 24, and 25, and one end of an air duct (airway) 37 is connected to this wind box 36. A forced draft fan (FDF) 38 is provided at the other end of air duct 37.

As shown in FIG. 1, the combustion gas passage 13 is connected to the vertical upper part of the furnace 11. The combustion gas passage 13 is provided with superheaters 102, 103, 104, reheaters 105, 106, and a coal economizer 107 as heat exchangers for recovering the heat of the combustion gas, and heat is exchanged between the combustion gas generated in the furnace 11 and the feed water and steam flowing inside each heat exchanger.

As shown in FIG. 1, the combustion gas passage 13 is connected downstream to a flue 14 through which the combustion gas that has undergone heat exchange is discharged. An air heater (air preheater) 42 is provided between the flue 14 and the air duct 37, and heat is exchanged between the air flowing through the air duct 37 and the combustion gas flowing through the flue 14, thereby raising the temperature of the combustion air supplied to the burners 21, 22, 23, 24, and 25.

The flue 14 is provided with a denitration device 43 at a position upstream of the air heater 42. The denitration device 43 supplies a reducing agent, such as ammonia or urea water, that has the effect of reducing nitrogen oxides into the flue 14, and promotes the reaction between the nitrogen oxides in the combustion gas to which the reducing agent has been supplied and the reducing agent by the catalytic action of a denitration catalyst installed in the denitration device 43, thereby removing and reducing the nitrogen oxides in the combustion gas. The gas duct 41 connected to the flue 14 is provided with a dust collector 44, such as an electric dust collector, an induced draft fan (IDF) 45, a desulfurization device 46, etc. at a position downstream of the air heater 42, and a chimney 50 is provided at the downstream end.

On the other hand, when the multiple pulverizers 31, 32, 33, 34, 35 are driven, the generated pulverized fuel is supplied to the burners 21, 22, 23, 24, 25 together with the carrier gas (primary air, oxidizing gas) through the pulverized fuel supply pipes 26, 27, 28, 29, 30. In addition, the exhaust gas discharged from the flue 14 is heat exchanged with the air heater 42, and the heated combustion air (secondary air, oxidizing gas) is supplied to the burners 21, 22, 23, 24, 25 from the air duct 37 through the wind box 36. The burners 21, 22, 23, 24, 25 blow a pulverized fuel mixture (mixed gas) of the pulverized fuel and the carrier gas into the furnace 11 and also blow the combustion air into the furnace 11, at which time the pulverized fuel mixture is ignited to form a flame. A flame is generated in the lower part of the furnace 11, and high-temperature combustion gas rises inside the furnace 11 and is discharged into the combustion gas passage 13. In this embodiment, air is used as the oxidizing gas. Gases with a higher or lower oxygen ratio than air may also be used, and can be used by optimizing the fuel flow rate.

Then, as shown in FIG. 1, the combustion gas undergoes heat exchange in the second superheater 103, the third superheater 104, the first superheater 102 (hereinafter sometimes simply referred to as "superheater"), the second reheater 106, the first reheater 105 (hereinafter sometimes simply referred to as "reheater"), and the economizer 107, which are arranged in the combustion gas passage 13. After that, nitrogen oxides are reduced and removed by the denitrification device 43, particulate matter is removed by the dust collector 44, and sulfur oxides are removed by the desulfurization device 46, and the combustion gas is discharged into the atmosphere from the chimney 50. Note that the heat exchangers do not necessarily have to be arranged in the order described above with respect to the combustion gas flow.

[Burner structure]
Next, a description will be given of the structure of the burners 21, 22, 23, 24, and 25. Note that the structure described below is common to the burners 21, 22, 23, 24, and 25. Therefore, in the following description, of the burners 21, 22, 23, 24, and 25, the burner 21 will be described as an example.

As shown in Figures 2 and 3, the burner 21 includes a burner body 210 and a burner nozzle 220 provided at the open end side of the burner body 210. Note that the left side of the burner 21 shown in Figures 2 and 3 is the furnace 11 side.

2 to 4, the burner body 210 is configured in a cylindrical shape closed by a body wall portion 211. In particular, the open end side corresponding to the tip of the burner body 210 is configured in a square cylindrical shape composed of four body walls 211A, 211B, 211C, and 211D. The burner body 210 is made of, for example, cast iron (FC200, etc.).
In the following description, when the positions of the main body walls are to be distinguished from one another, the reference numerals 211A, 211B, 211C, and 211D are used. When the main body walls are to be collectively referred to, the reference numeral 211 is simply used.

The inside of the main body wall 211 is the main body side primary flow path MP1. The supplied mixed gas flows through this main body side primary flow path MP1 toward the burner nozzle 220 side (furnace 11 side).

The outside of the main body wall 211 is the main body side secondary flow path MP2. This main body side secondary flow path MP2 is located inside the wind box 36, and the combustion air supplied from the air duct 37 flows toward the burner nozzle 220 side (furnace 11 side).

The burner nozzle 220 is configured in a double cylindrical shape in which a cylindrical portion closed by a nozzle outer wall 221 houses an angular cylindrical portion closed by four nozzle inner walls 222A, 222B, 222C, and 222D.
In the following description, when the positions of the nozzle inner walls are to be distinguished, the reference symbols 222A, 222B, 222C, and 222D are used. When the nozzle inner walls are to be collectively referred to, the reference symbol 222 is simply used.

As shown in FIG. 3, at the position where the nozzle outer wall 221 and nozzle inner wall 222 (specifically, nozzle inner walls 222B, 222D) of the burner nozzle 220 overlap with the body wall portion 211 (specifically, body wall portions 211B, 211D) of the burner body 210, a pin member 230 is inserted from the outside of the opposing wall surface (the upper and lower wall surfaces shown in FIG. 3) of the burner nozzle 220. The burner nozzle 220 is connected to the burner body 210 by the inserted pin member 230, and is configured to be rotatable relative to the burner body 210 with the pin member 230 as a pivot point (see FIG. 5 and FIG. 6). This allows the angle of the burner nozzle 220 relative to the burner body 210 to be adjusted.

As shown in Figures 2 to 4, the inside of the nozzle inner wall 222 is the nozzle-side primary flow passage NP1. In this nozzle-side primary flow passage NP1, a mixed gas containing fuel supplied from the main body-side primary flow passage MP1 of the burner main body 210 flows toward the furnace 11.

The nozzle side secondary flow passage NP2 is defined between the nozzle outer wall 221 and the nozzle inner wall 222. Combustion air supplied from the main body side secondary flow passage MP2 of the burner main body 210 flows through this nozzle side secondary flow passage NP2 toward the furnace 11.

As shown in Figures 2, 4 to 6, a seal plate (plate-shaped member) 240 is provided on each of the nozzle inner walls 222A, 222C of the burner nozzle 220.

As shown in FIG. 7, each sealing plate 240 is a single plate-like member composed of a connecting portion 241 and a curved portion 242. The connecting portion 241 is a flat plate portion. On the other hand, the curved portion 242 is a plate portion that is smoothly curved to draw a mountain-shaped arc. The sealing plate 240 is made of, for example, stainless steel (SUS304, etc.).

As shown in Figures 2, 4 to 6, the connection portion 241 is connected to the inner circumferential surface of the nozzle inner walls 222A, 222C (specifically, the upstream portion in the flow direction of the mixed gas). The connection portion 241 and the nozzle inner walls 222A, 222C are connected and integrated by, for example, welding.

The connection portion 241 may be connected to the outer circumferential surfaces of the nozzle inner walls 222A, 222C.
Furthermore, the ends of the nozzle inner walls 222A, 222C may be extended upstream in the flow direction of the mixed gas to serve as the connection portion 241 of the seal plate 240. In other words, the seal plate 240 may be formed in such a manner that the nozzle inner walls 222A, 222C also serve as the connection portion 241.

On the other hand, the curved portion 242 protrudes from the end of the nozzle inner wall 222 (the end on the upstream side in the flow direction of the mixed gas) toward the burner body 210. The curved portion 242 is formed elastically with respect to the connection portion 241. In addition, the curved portion 242 itself is also elastically deformable.

The curved portion 242 of the sealing plate 240 provided on the nozzle inner wall 222A is convex toward the main body wall portion 211A and is in contact with the outer circumferential surface of the main body wall portion 211A so as to be elastically pressed against the outer circumferential surface of the main body wall portion 211A. As shown in Fig. 4, the sealing plate 240 has a width dimension approximately equal to that of the main body wall portion 211A and is in contact with the main body wall portion 211A over the entire width direction.
Similarly, the curved portion 242 of the sealing plate 240 provided on the nozzle inner wall 222C is convex toward the main body wall portion 211C and is in contact with the outer circumferential surface of the main body wall portion 211C so as to be elastically pressed against the outer circumferential surface of the main body wall portion 211C. The sealing plate 240 has a width dimension approximately equal to that of the main body wall portion 211C and is in contact with the main body wall portion 211C over the entire width direction.

2, 5 and 6, the seal plate 240 rotates together with the burner nozzle 220, but is configured so that the curved portion 242 is always pressed against the outer peripheral surface of the body wall portion 211 due to its elasticity. This allows the gap between the nozzle inner wall 222A and the body wall portion 211A and the gap between the nozzle inner wall 222C and the body wall portion 211C, which change due to the rotation of the burner nozzle 220, to be always sealed by each seal plate 240. Therefore, it is possible to suppress leakage of pulverized fuel in the mixed gas flowing through the nozzle side primary flow path NP1 into the body side secondary flow path MP2 and/or the nozzle side secondary flow path NP2 through the gap between the nozzle inner wall 222A and the body wall portion 211A and the gap between the nozzle inner wall 222C and the body wall portion 211C.

When the burner nozzle 220 rotates, the curved portion 242 that comes into contact with the outer peripheral surface of the main body wall portion 211 is curved in a mountain shape, so that the seal plate 240 (curved portion 242) moves and slides smoothly as the burner nozzle 220 rotates.

The seal plate 240 undergoes a predetermined amount of elastic deformation when the burner nozzle 220 is not rotating (as shown in FIG. 2), and the curved portion 242 is pressed against the body wall portion 211. This "predetermined amount" is set to an amount of deformation such that the curved portion 242 is pressed against the body wall portion 211 even when the burner nozzle 220 rotates and the gap between the nozzle inner wall 222 and the body wall portion 211 becomes maximum. The shape of the seal plate 240 is designed and its elasticity is set so that the curved portion 242 does not undergo plastic deformation even when the burner nozzle 220 rotates and the gap between the nozzle inner wall 222 and the body wall portion 211 becomes minimum.

According to this embodiment, the following effects are obtained.
The burner nozzle 220 has a sealing plate 240 that is provided on the burner nozzle 220 and elastically contacts the outer peripheral surface of the burner body 210, so that the gap between the burner body 210 and the burner nozzle 220 as an angle adjustment allowance can be sealed by the sealing plate 240 provided on the burner nozzle 220.

In addition, since the seal plate 240 is in elastic contact with the burner body 210, even if the angle of the burner nozzle 220 is adjusted and the dimensions of the gap between the burner body 210 and the burner nozzle 220 change, the seal plate 240 can be brought into contact with the burner body 210 so as to follow the change in dimensions. This allows the gap between the burner body 210 and the burner nozzle 220 as an angle adjustment allowance to always be sealed, regardless of the angle of the burner nozzle 220.

In addition, the seal plate 240 is formed with a curved portion 242 that is convex toward the burner body 210, and the seal plate 240 contacts the burner body 210 at the curved portion 242, so that the seal plate 240 can slide smoothly on the outer peripheral surface of the burner body 210 even if the angle of the burner nozzle 220 is adjusted.

[Modification]
As shown in FIGS. 8 to 10, a bent plate 243 may be attached to the sealing plate 240 .
The bent plate 243 is a plate-shaped member, and is connected by welding to parts of the edges on both sides of the curved portion 242 so as to be perpendicular to the curved portion 242 .
8, when the seal plate 240 is not attached to the burner nozzle 220, the end face 243A (the lower end face in FIG. 8) of the bent plate 243 is inclined with respect to the end face 250A (the upper end face in FIG. 8) of the side seal plate 250. Note that the side seal plate 250 in FIG. 8 is shown in the position in the state where it is attached to the burner nozzle 220.
However, as shown in Figure 10, when the sealing plate 240 is attached to the burner nozzle 220 and the curved portion 242 comes into contact with the burner body 210, the curved portion 242 elastically deforms, so that the end face 243A of the folded plate 243 becomes approximately parallel to the end face 250A of the side sealing plate 250.

As shown in Fig. 9, the bent plate 243 of the seal plate 240 connected to the nozzle inner wall 222A covers a part of the body wall 211B, 211D adjacent to the body wall 211A. At this time, the thickness dimension of the bent plate 243 is approximately equal to the dimension of the gap between the body wall 211B and the nozzle inner wall 222B (the dimension of the gap between the body wall 211D and the nozzle inner wall 222D). Also, as shown in Fig. 10, the width dimension of the bent plate 243 is set to a dimension sufficient to cover the gap generated between the burner body 210 when the burner nozzle 220 rotates. This allows the bent plate 243 to fill the gap between the body wall 211B and the nozzle inner wall 222B and the gap between the body wall 211D and the nozzle inner wall 222D.
9, the bent plate 243 of the seal plate 240 connected to the nozzle inner wall 222C covers a part of the main body wall portions 211B and 211D adjacent to the main body wall portion 211C. At this time, the thickness dimension of the bent plate 243 is approximately equal to the dimension of the gap between the main body wall portion 211B and the nozzle inner wall 222B (the dimension of the gap between the main body wall portion 211D and the nozzle inner wall 222D). This allows the bent plate 243 to fill the gap between the main body wall portion 211B and the nozzle inner wall 222B and the gap between the main body wall portion 211D and the nozzle inner wall 222D.

In addition, if there is a gap between the end of the folded plate 243 on the nozzle inner wall 222A side and the end of the folded plate 243 on the nozzle inner wall 222C side, a side seal plate 250 having a thickness similar to that of the folded plate 243 may be provided. This allows the folded plate 243 to fill the gap between the main body wall portion 211B and the nozzle inner wall 222B and the gap between the main body wall portion 211D and the nozzle inner wall 222D. The side seal plate 250 is connected to the nozzle inner walls 222B, 222C by, for example, welding.

If the bent plate 243 or the side seal plate 250 is not provided, the gap between the body wall 211B and the nozzle inner wall 222B and the gap between the body wall 211D and the nozzle inner wall 222D may be filled by adjusting the width dimension of the burner body 210.

The present embodiment described above can be understood, for example, as follows.
That is, the burner (21) according to the present embodiment comprises a cylindrical burner body (210) through which a mixed gas containing fuel flows, and a cylindrical burner nozzle (220) which surrounds the open end side of the burner body (210) located downstream in the flow direction of the mixed gas and is connected to the burner body (210) so that the angle can be adjusted, and which guides the mixed gas and combustion air flowing out from the open end of the burner body (210) into the furnace, and the burner nozzle (220) is provided with a plate-shaped member (240) which is connected to the burner nozzle (220) and which elastically contacts the outer peripheral surface of the burner body (210).

The burner (21) according to this embodiment comprises a cylindrical burner body (210) through which a mixed gas containing fuel flows, and a cylindrical burner nozzle (220) which surrounds the open end side of the burner body (210) located downstream in the flow direction of the mixed gas and is connected to the burner body (210) so as to be angle-adjustable, and which guides the mixed gas flowing out from the open end of the burner body (210) into the furnace, and the burner nozzle (220) has a plate-shaped member (240) which is provided upstream of the burner nozzle (220) in the flow direction of the mixed gas and which elastically contacts the outer peripheral surface of the burner body (210), so that a gap serving as an angle adjustment between the burner body (210) and the burner nozzle (220) can be sealed by the plate-shaped member (240) provided on the burner nozzle (220).
In addition, since the plate-like member (240) is in elastic contact with the burner body (210), even if the angle of the burner nozzle (220) is adjusted and the dimension of the gap between the burner body (210) and the burner nozzle (220) changes, the plate-like member (240) can be brought into contact with the burner body (210) so as to follow the change in dimension. This makes it possible to always seal the gap between the burner body (210) and the burner nozzle (220) as an angle adjustment allowance, regardless of the angle of the burner nozzle (220).

In addition, in the burner (21) according to this embodiment, the plate-shaped member (240) is formed with a curved portion (242) that is convex toward the burner body (210), and the plate-shaped member (240) is in contact with the burner body (210) at the curved portion (242).

In the burner (21) according to this embodiment, the plate-shaped member (240) is formed with a curved portion (242) that is convex toward the burner body (210), and the plate-shaped member (240) is in contact with the burner body (210) at the curved portion (242). Therefore, even if the angle of the burner nozzle (220) is adjusted, the plate-shaped member (240) can slide smoothly on the outer peripheral surface of the burner body (210).

In addition, in the burner (21) according to this embodiment, the opening end side of the burner body (210) is a square tube having four sides, the burner nozzle (220) is angle adjustable in the opposing direction of two opposing sides (211A, 211C) at the opening end side of the burner body (210), and the plate-like member (240) is in contact with the two opposing sides (211A, 211C).

In the burner (21) according to this embodiment, the open end side of the burner body (210) is a square tube consisting of four faces, the burner nozzle (220) is angle adjustable in the opposing direction of two opposing faces (211A, 211C) at the open end side of the burner body (210), and the plate-like member (240) is in contact with the two opposing faces (211A, 211C), so that the gap between the burner body (210) and the burner nozzle (220) can be sealed at least on the outer peripheral surface of the burner body (210) corresponding to the direction in which the angle of the burner nozzle (220) is adjusted.

In addition, in the burner (21) according to this embodiment, the plate-like member (240) that contacts one of the two opposing surfaces (211A, 211C) covers a portion of both side surfaces adjacent to the one surface, and the plate-like member (240) that contacts the other of the two opposing surfaces (211A, 211C) covers a portion of both side surfaces adjacent to the other surface.

In the burner (21) according to this embodiment, the plate-like member (240) in contact with one of the two opposing faces (211A, 211C) covers a portion of both side faces adjacent to the one face, and the plate-like member (240) in contact with the other of the two opposing faces (211A, 211C) covers a portion of both side faces adjacent to the other face, so that the gap between the side faces (the faces adjacent to the one face and the other face) on the opening end side of the burner body (210) and the burner nozzle (220) can be filled with each plate-like member (240).

The boiler (10) according to this embodiment is also equipped with the burner (21) described above.

The power generation plant according to this embodiment also includes a boiler (10) and a power generation unit that generates power using steam generated by the boiler (10).

The method for assembling the burner (21) according to this embodiment is a method for assembling a burner (21) comprising a cylindrical burner body (210) through which a mixed gas containing fuel flows, a cylindrical burner nozzle (220) that is connected to the burner body (210) at an open end side of the burner body (210) located downstream in the flow direction of the mixed gas so as to be angle-adjustable and that guides the mixed gas and combustion air flowing out from the open end into the furnace, and a plate-shaped member (240) that elastically contacts the outer peripheral surface of the burner body (210), and includes a step of providing the plate-shaped member (240) to the burner nozzle (220).

10 boiler 11 furnace 12 combustion device 13 combustion gas passage 14 flue 21, 22, 23, 24, 25 burner 26, 27, 28, 29, 30 pulverized fuel supply pipe 31, 32, 33, 34, 35 pulverizer (mill)
36 Wind box 37 Air duct (airway)
38 Forced draft fan (FDF)
41 Gas duct 42 Air heater (air preheater)
43 Denitrification device 44 Dust collector 45 Induced draft fan (IDF)
46 Desulfurization device 50 Chimney 101 Furnace wall 102 First superheater (heat exchanger)
103 Second superheater (heat exchanger)
104 Third superheater (heat exchanger)
105 First reheater (heat exchanger)
106 Second reheater (heat exchanger)
107 Energy saver (heat exchanger)
210 Burner body 211 (211A, 211B, 211C, 211D) Body wall portion 220 Burner nozzle 221 Nozzle outer wall 222 (222A, 222B, 222C, 222D) Nozzle inner wall 230 Pin member 240 Seal plate (plate-shaped member)
241 Connection portion 242 Curved portion 243 Bent plate 250 Side seal plate MP1 Body side primary flow path MP2 Body side secondary flow path NP1 Nozzle side primary flow path NP2 Nozzle side secondary flow path

Claims (6)

A cylindrical burner body through which a mixed gas containing fuel flows;
a cylindrical burner nozzle that surrounds an open end side of the burner body located downstream in a flow direction of the mixed gas, is connected to the burner body in an angle adjustable manner, and guides the mixed gas flowing out from the open end of the burner body into a furnace;
Equipped with
the burner nozzle has a plate-like member that is provided on the upstream side of the burner nozzle in a flow direction of the mixed gas and that elastically contacts an outer circumferential surface of the burner body ,
The plate-shaped member is formed with a curved portion that is convex toward the burner body side,
The plate-shaped member is in contact with the burner body at the curved portion . The open end side of the burner body is formed into a square tube shape having four sides,
The burner nozzle is adjustable in angle in a facing direction of two faces facing each other at the opening end side of the burner body,
The burner according to claim 1 , wherein the plate member is in contact with the two opposing surfaces. The plate-like member contacting one of the two opposing surfaces covers a portion of both side surfaces adjacent to the one surface,
The burner according to claim 2 , wherein the plate-like member in contact with the other of the two opposing surfaces covers a part of both side surfaces adjacent to the other surface. A boiler equipped with a burner according to any one of claims 1 to 3 . A boiler according to claim 4 ;
a power generation unit that generates electricity using steam generated by the boiler;
A power plant comprising: A cylindrical burner body through which a mixed gas containing fuel flows;
a cylindrical burner nozzle that is connected to the burner body at an open end side of the burner body located downstream in a flow direction of the mixed gas so as to be angle adjustable, and that guides the mixed gas flowing out from the open end into a furnace;
A plate-shaped member that elastically contacts the outer peripheral surface of the burner body;
A method of assembling a burner comprising:
The plate-shaped member has a curved portion that is convex toward the burner body and contacts the burner body,
A burner assembling method comprising the step of providing the plate-shaped member upstream of the burner nozzle in a flow direction of the mixed gas .

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