JP2022062921A - Repair method for burner, burner, boiler, and power generation plant - Google Patents

Abstract

To provide a repair method for a burner that can repair a damaged part by a quick and simple method even if the damaged part occurs in a burner body, the burner, a boiler, and a power generation plant.SOLUTION: A repair method for a burner comprising a cylindrical burner body 210 through which mixed gas including fuel flows comprises: a removal step of removing a predetermined portion including a damaged part occurring in a wall part 211 of the burner body 210, from the wall part 211 of the burner body 210; a production step of providing a repair material 240 having a shape corresponding to a defective portion formed in the wall part 211 by the predetermined portion, on a plate material 250 having a shape along an inner peripheral surface of the wall part 211; and a connection step of connecting the plate material 250 to the inner peripheral surface of the wall part 211 while the repair material 240 is located in the defective portion.SELECTED DRAWING: Figure 12

Description

The present disclosure relates to burner repair methods, burners, boilers and power plants.

The large boiler used in a power plant has a hollow fireplace installed in the vertical direction, and a plurality of burners are arranged along the circumferential direction of the fireplace on the wall of the fireplace. Further, in the boiler, a flue is connected to the upper part in the vertical direction of the fireplace, and a heat exchanger for generating steam is arranged in this flue. Then, the burner injects a mixture of fuel and air (oxidizing gas) into the furnace to form a flame, and combustion gas is generated and 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 or steam flowing in the heat transfer tube constituting the heat exchanger.

For example, as disclosed in Patent Document 1, some burners used in coal-fired boilers have a burner main body and a burner nozzle, and the burner nozzle is connected to the burner main body so that the angle can be adjusted. In such a burner, a combustible air-fuel mixture consisting of fuel (for example, pulverized coal) and primary air flows inside the burner body, and high-temperature secondary air flows outside the burner body. There is. In this case, if the tip of the burner body (the burner body near the connection with the burner nozzle) is damaged, the combustible mixture will be damaged from the damaged part depending on the pressure difference between the inside and outside of the burner body and the angle of the burner nozzle. It may leak to the outside of the burner body.

Japanese Unexamined Patent Publication No. 2001-165411

As described above, since high-temperature secondary air circulates outside the burner body, if the combustible air-fuel mixture leaks to the outside of the burner body, the combustible air-fuel mixture can undergo a high-temperature oxidation reaction outside the burner body. There is sex. Therefore, it is necessary to repair the damaged part in order to avoid leakage of the combustible mixture.

If the burner does not have the angle adjustment function of the burner nozzle, or if the angle adjustment function of the burner nozzle is not used after repairing the damaged part, repair the damaged part by attaching the repair part to the burner body from the outside of the burner body with fasteners such as bolts. Is possible. This is because the position and angle of the burner nozzle are constant, so even if the outer shape of the burner body changes depending on the repair parts, it does not interfere with the burner nozzle.

On the other hand, when the angle adjustment function of the burner nozzle is used, if the damage is minor, it can be repaired from the inside of the burner body with a filler such as ceramic putty. Further, there is a method of attaching a repair part to the burner main body by welding when damage that cannot be dealt with by the filler occurs, for example, the damaged part is large.
However, depending on the material of the burner body, welding may not be possible on the burner body. In such a case, large-scale repair work such as replacement of the burner body is required, which causes problems in terms of cost and delivery time. be.

This disclosure has been made in view of such circumstances, and even if a damaged part occurs in the main body of the burner, the damaged part can be repaired quickly and by a simple method. The purpose is to provide repair methods, burners, boilers and power plants.

In order to solve the above problems, the burner repair method, the burner, the boiler and the power plant of the present disclosure adopt the following means.
That is, the method for repairing a burner according to one aspect of the present disclosure is a method for repairing a burner having a tubular burner body through which a mixed gas containing fuel flows, and the damage caused to the wall portion of the burner body is caused. A removal step of removing a predetermined portion including a portion from the wall portion of the burner body, and a repair material having a shape corresponding to the defective portion formed on the wall portion by the predetermined portion are applied to the inner peripheral surface of the wall portion. It includes a manufacturing process provided on the plate material having a shape along the shape, and a connection step of connecting the plate material to the inner peripheral surface of the wall portion in a state where the repair material is located at the defective portion.

Further, the burner according to one aspect of the present disclosure has a tubular shape surrounded by a wall portion, and the burner main body from which a predetermined portion of the wall portion is removed and the wall along the inner peripheral surface of the wall portion. A plate material connected to the inner peripheral surface of the portion, a repair material having a shape corresponding to the defective portion formed on the wall portion by the predetermined portion, and a repair material attached to the plate material in a state of being located at the defective portion. It is equipped with.

Further, the boiler according to one aspect of the present disclosure is provided with the above-mentioned burner.

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

According to the present disclosure, a burner repair method, a burner, a boiler, and a power plant capable of quickly and easily repairing a damaged part even if the burner body has a damaged part are provided. can do.

It is a schematic block diagram of the coal-fired boiler which concerns on 1st Embodiment. It is a partially enlarged view (vertical sectional view) in the vicinity of the opening end of the burner which concerns on 1st Embodiment. FIG. 3 is a cross-sectional view taken along the cutting line III-III shown in FIG. It is a front view which looked at the burner which concerns on 1st Embodiment from the opening end side. It is a partial perspective view of the burner main body in which the damaged part occurred in 1st Embodiment. It is a partial perspective view of the burner main body which the predetermined part was determined in 1st Embodiment. It is a partial perspective view of the burner main body in which the defective part was formed in 1st Embodiment. It is a perspective view of the repair material which concerns on 1st Embodiment. It is a perspective view of the plate material which concerns on 1st Embodiment. It is a partial perspective view of the burner main body in which the repair material and the plate material are arranged in 1st Embodiment. It is a perspective view of a repair material and a plate material in 1st Embodiment. It is a partial perspective view of the burner main body in which the plate material to which the repair material is connected is arranged in 1st Embodiment. It is a partial perspective view of the burner main body in which the plate material to which the connecting plate material is connected is arranged in 1st Embodiment. It is a partial perspective view of the burner body in which the gap between a repair material and a wall portion is filled with a filler in 1st Embodiment. It is a vertical cross-sectional view of a burner body in which a step between a plate material and a wall portion is filled with a filler in 1st Embodiment. FIG. 3 is a vertical cross-sectional view of a burner when plate members are connected in FIG. It is a partially enlarged view of the X part shown in FIG. 16 when the burner nozzle which concerns on 1st Embodiment is offset. It is a partially enlarged view of the Y part shown in FIG. 16 when the burner nozzle which concerns on 1st Embodiment is offset. It is a partial perspective view of the burner main body which a damaged part occurred in 2nd Embodiment. It is a partial perspective view of the burner main body in which the plate material is arranged in 2nd Embodiment.

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

The boiler 10 is provided in a power plant provided 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 a steam turbine provided in the power plant to rotate the steam turbine. Then, the steam turbine rotates and drives the generator to generate electricity.

As shown in FIG. 1, the boiler 10 has a fireplace 11, a combustion device 12, and a combustion gas passage 13. The furnace 11 has a hollow shape of a square cylinder and is installed along the vertical direction. The fireplace wall 101 constituting the fireplace 11 is composed of a plurality of heat transfer tubes and fins connecting them, and exchanges heat generated by combustion of pulverized fuel with water or steam flowing inside the heat transfer tubes. The temperature rise of the furnace wall 101 is suppressed.

The combustion device 12 is provided on the lower side of the fireplace wall 101 constituting the fireplace 11. In the present embodiment, the combustion device 12 has a plurality of burners (for example, 21, 22, 23, 24, 25) mounted on the furnace wall 101. 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 a plurality of stages (for example, 5 stages in FIG. 1) along the vertical direction. Has been done. However, the shape of the furnace 11, the number of burners in one stage, the number of stages, the arrangement, and the like are not limited to this embodiment.

The burners 21, 22, 23, 24, 25 are connected to a plurality of crushers (mills) 31, 32, 33, 34, 35 via pulverized coal supply pipes 26, 27, 28, 29, 30. In the crusher 31, 32, 33, 34, 35, for example, a crushing table (not shown) is rotatably supported in the housing of the crusher, and a plurality of crushing rollers (not shown) are above the crushing table. Is supported so as to be rotatable in conjunction with the rotation of the crushing table. When coal is thrown between a plurality of crushing rollers and a crushing table, it is crushed and transported by a transport gas (primary air, oxidizing gas) to a classifier (not shown) in the crusher housing. , The pulverized fuel classified within a predetermined particle size range can be supplied to the burners 21, 22, 23, 24, 25 from the pulverized coal supply pipes 26, 27, 28, 29, 30.

Further, the fireplace 11 is provided with a wind box 36 at the mounting positions of the burners 21, 22, 23, 24, 25, and one end of the air duct (air passage) 37 is connected to the wind box 36. The air duct 37 is provided with a forced Draft Fan (FDF) 38 at the other end thereof.

As shown in FIG. 1, the combustion gas passage 13 is connected to the upper part of the furnace 11 in the vertical direction. The combustion gas passage 13 is provided with superheaters 102, 103, 104, reheaters 105, 106, and coal saver 107 as heat exchangers for recovering the heat of the combustion gas, and is generated in the furnace 11. Heat exchange takes place between the combustion gas and the water supply and steam circulating inside each heat exchanger.

As shown in FIG. 1, the combustion gas passage 13 is connected to a flue 14 on which heat-exchanged combustion gas is discharged on the downstream side thereof. In the flue 14, 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, and the burner 21, The temperature of the combustion air supplied to 22, 23, 24, 25 can be raised.

Further, 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 having an action of reducing nitrogen oxides such as ammonia and urea water into the flue 14, and the reaction between the nitrogen oxides in the combustion gas to which the reducing agent is supplied and the reducing agent. Is promoted by the catalytic action of the denitration catalyst installed in the denitration device 43 to remove and reduce 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 is downstream. A chimney 50 is provided at the end.

On the other hand, when a plurality of crushers 31, 32, 33, 34, 35 are driven, the generated pulverized fuel is charged with the transport gas (primary air, oxidizing gas) and the pulverized coal supply pipes 26, 27, 28, 29, 30. It is supplied to burners 21, 22, 23, 24, 25 through. Further, by exchanging heat with the exhaust gas discharged from the flue 14 by the air heater 42, the heated combustion air (secondary air, oxidizing gas) is transferred from the air duct 37 to the burner 21 via the air box 36. It is supplied to 22, 23, 24, 25. The burners 21, 22, 23, 24, 25 blow the fine powder fuel mixture (mixed gas), which is a mixture of the fine powder fuel and the transport gas, into the fireplace 11 and the combustion air into the fireplace 11, and at this time, the fine powder fuel. A flame can be formed by igniting the air-fuel mixture. A flame is generated in the lower part of the furnace 11, and the high-temperature combustion gas rises in the furnace 11 and is discharged to the combustion gas passage 13. In this embodiment, air is used as the oxidizing gas. It may have a higher oxygen ratio than air or a lower oxygen ratio than air, and can be used by optimizing the fuel flow rate.

After that, as shown in FIG. 1, the combustion gas is referred to as a second superheater 103, a third superheater 104, and a first superheater 102 arranged in the combustion gas passage 13 (hereinafter, simply referred to as “superheater”). After heat exchange with the second reheater 106, the first reheater 105 (hereinafter, may be simply referred to as “reheater”), and the economizer 107, nitrogen is removed by the denitration device 43. The oxide is reduced and removed, the particulate matter is removed by the dust collector 44, the sulfur oxide is removed by the desulfurization device 46, and then the sulfur oxide is discharged from the chimney 50 into the atmosphere. It should be noted that each heat exchanger does not necessarily have to be arranged in the order described above with respect to the combustion gas flow.

[About the structure of the burner]
Next, the structures of the burners 21, 22, 23, 24, 25 will be described. The structure described below is common to the burners 21, 22, 23, 24, and 25. Therefore, in the following description, the burner 21 of the burners 21, 22, 23, 24, and 25 will be described as an example.

As shown in FIGS. 2 and 3, the burner 21 includes a burner main body 210 and a burner nozzle 220 provided on the open end side of the burner main body 210. The left side of the burner 21 shown in FIGS. 2 and 3 is the inside of the fireplace 11 (inside the fireplace).

As shown in FIGS. 2 to 4, the burner main body 210 is configured in a tubular shape closed by the main body wall portion 211. In particular, the opening end side corresponding to the tip of the burner main body 210 has a square cylinder shape composed of four main body wall portions 211A, 211B, 211C, and 211D. The burner body 210 is made of, for example, cast iron (FC200 or the like).
In the following description, when the position of the main body wall portion is shown separately, reference numerals 211A, 211B, 211C, 211D will be used. Further, when the main body wall portion is shown as a whole, it will be described simply by using reference numeral 211.

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

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

The burner nozzle 220 is configured in a double tubular shape in which the square tubular portion closed by the nozzle inner wall 222 is housed inside the tubular portion closed by the nozzle outer wall 221.
The burner nozzle 220 is provided on the open end side (fire furnace 11 side) of the burner main body 210 and surrounds the outer peripheral surface of the burner main body 210 on the open end side.

As shown in FIG. 3, the wall surfaces of the burner nozzle 220 facing each other at the positions where the nozzle outer wall 221 and the nozzle inner wall 222 of the burner nozzle 220 and the main body wall portions 211 (specifically, the main body wall portions 211B and 211D) of the burner main body 210 overlap. The pin member 230 is inserted from the outside (upper and lower wall surfaces shown in FIG. 3). The burner nozzle 220 is connected to the burner main body 210 by the inserted pin member 230, and is configured to be rotatable with respect to the burner main body 210 with the pin member 230 as a rotation fulcrum.

As shown in FIGS. 2 to 4, the inside of the nozzle inner wall 222 is a nozzle-side primary flow path NP1. A mixed gas supplied from the main body side primary flow path MP1 of the burner main body 210 is flowing toward the furnace 11 side in the nozzle side primary flow path NP1.

Between the nozzle outer wall 221 and the nozzle inner wall 222 is a nozzle-side secondary flow path NP2. Combustion air supplied from the main body side secondary flow path MP2 of the burner main body 210 flows toward the furnace 11 side in the nozzle side secondary flow path NP2.

[How to repair the burner]
When the burner 21 configured as described above is used, as shown in FIG. 5, a damaged portion 223 is generated on the inner wall of the main body wall portion 211 (for example, the main body wall portion 211A) located on the opening end side of the burner main body 210. In some cases. The damaged portion 223 is generated, for example, by thinning due to wear, cracking, burning, or the like.

If you want to continue using the burner 21 that has the damaged part 223 as described above, the damaged part 223 must be repaired. Hereinafter, a method of repairing the damaged portion 223 generated in the main body wall portion 211 will be described. At the start of repair, it is assumed that the burner nozzle 220 has been removed from the burner main body 210.

[First Embodiment]
Hereinafter, the first embodiment of the present disclosure will be described.
As shown in FIG. 6, in the main body wall portion 211A, the range of the predetermined portion 224 including the damaged portion 223 caused by the use of the burner 21 is determined. After determining the predetermined portion 224, as shown in FIG. 7, the predetermined portion 224 is cut and removed from the main body wall portion 211A (removal step). As a result, the defective portion 225 is formed on the main body wall portion 211A.

Next, as shown in FIG. 8, another member (repair material 240) corresponding to the shape of the defective portion 225 is prepared. The repair material 240 has substantially the same shape as the defective portion 225. The repair material 240 is made of, for example, stainless steel in consideration of the usage conditions of the burner main body 210.
Further, as shown in FIG. 9, a plate material 250 (plate material 250A) having a shape along the inner peripheral surface of the main body wall portion 211 is prepared. In the case of FIG. 9, the shape of the plate material 250A is a flat plate along the inner peripheral surface of the main body wall portion 211A. If the inner peripheral surface of the main body wall portion 211A is curved, the plate material 250A also has a curved shape. The plate material 250 is made of, for example, stainless steel in consideration of the usage conditions of the burner main body 210.

Next, as shown in FIG. 10, the plate material 250A is applied to the main body wall portion 211A and the repair material 240 is arranged in the defective portion 225 to determine the position of the repair material 240 with respect to the plate material 250A. At this time, the position of the repair material 240 may be marked on the plate material 250A.

After positioning the repair material 240 with respect to the plate material 250A, the repair material 240 is attached to the plate material 250A as shown in FIG. As a result, the plate material 250A and the repair material 240 are integrated. The mounting is done, for example, by welding.
Further, instead of attaching the repair material 240, which is a separate member corresponding to the shape of the defective portion 225, to the plate material 250A, a member having a portion corresponding to the plate material 250A and a portion corresponding to the repair material 240 is integrated. It may be formed. For example, a plate portion thicker than the total of the plate thickness of the plate material 250A and the plate thickness of the repair material 240 is cut, and a plate portion having a shape along the inner peripheral surface of the main body wall portion 211 (inner peripheral surface of the main body wall portion 211) is cut. A portion corresponding to the plate material 250A and a portion to be arranged in the defective portion (a portion corresponding to the repair material 240) may be integrally formed and arranged on the main body wall portion 211A and the defective portion 225. This can be applied, for example, when the damaged portion 223 of the burner main body 210 can be accurately measured and the defective portion 225 is larger than the size of the burner nozzle 220.
By any of the above steps (manufacturing step), a member having a plate material 250A and a repair material 240 is prepared.

Next, as shown in FIG. 12, the plate material 250A to which the repair material 240 is connected is applied to the main body wall portion 211A. At this time, the repair material 240 connected to the plate material 250A is located at the defective portion 225 formed on the main body wall portion 211A.
Further, apart from the plate material 250A, plate materials 250B, 250C, 250D having a shape along the inner peripheral surface of the main body wall portions 211B, 211C, 211D are prepared, and these plate materials 250B, 250C, 250D are also the plate material 250A. Similarly, it is applied to each of the main body wall portions 211B, 211C, and 211D. As a result, most of the inner peripheral surface of the main body wall portion 211 located on the open end side of the burner main body 210 is covered with the plate material 250.
In the following description, when the positions of the plate materials are shown separately, reference numerals 250A, 250B, 250C, and 250D will be used. Further, when the plate material is shown as a whole, it will be described simply by using reference numeral 250.

Next, as shown in FIG. 13, another plate material (connection plate material 252) corresponding to the shape of the gap (gap at the four corners of the main body wall portion 211) formed between the plate materials 250 is prepared, and each plate material is prepared. By welding with the plate material 250, a square tubular plate material 250 in which four plate materials 250A, 250B, 250C, and 250D are integrated is configured. As a result, the integrated square tubular plate material 250 is fitted into the inner peripheral surface of the square tubular main body wall portion 211, and the displacement of the plate material 250 in all directions is regulated by the inner peripheral surface of the main body wall portion 211.
The shape of the connecting plate material 252 may be determined by matching the actual product according to the shape of the burner nozzle 220.

In the above explanation, the square tubular plate 250 is constructed by using the plate 250A, 250B, 250C, 250D, but for example, the plate 250C located on the upper surface is omitted and the plate material 250C is omitted and has a three-sided (U-shaped) shape. The plate material 250 may be configured. Even such a plate material 250 can be fitted into the inner peripheral surface of the square tubular main body wall portion 211, so that the plate material 250 can be stably connected to the inner peripheral surface of the main body wall portion 211. can.

Next, as shown in FIG. 14, the gap formed between the main body wall portion 211A and the repair material 240 is filled with a filler 260 such as a ceramic putty. Further, as shown in FIG. 15, a step formed between an end portion on the upstream side of the plate material 250A (the side opposite to the opening end of the burner main body 210) and the inner peripheral surface of the main body wall portion 211A is formed by a ceramic putty or the like. Fill with the filler 260. In this way, by smoothing the shape-changing portions such as gaps and steps by using the filler 260, it is possible to reduce the resistance to the flow of the mixed gas and the combustion air.

Next, as shown in FIG. 16, the burner nozzle 220 is arranged at a predetermined position on the open end side of the burner main body 210, and the pin member 230 is inserted from the outside of the burner nozzle 220.
One hole is formed in each of the plate materials 250B and 250C corresponding to the side surfaces of the integrated plate material 250, and the pin member 230 is inserted into each hole of the plate materials 250B and 250C at the same time as the burner nozzle 220 is connected. , The plate material 250 is connected to the main body wall portion 211 (connection step).

At this time, a gap is provided between the burner main body 210 and the burner nozzle 220 so that the burner nozzle 220 can rotate smoothly. However, the burner nozzle 220 may move in the insertion direction of the pin member 230 by the amount of the gap provided. Therefore, for example, when the burner nozzle 220 is offset and is closest to the burner main body 210 (when the burner nozzle 220 comes into contact with the main body wall portion 211B) as shown in FIG. 17, the opposite side is shown in FIG. At the portion located at, the burner nozzle 220 is most distant from the main body wall portion 211D of the burner main body 210.
The pin member 230 has a length dimension such that the protrusion amount p from the inner peripheral surface of the main body wall portion 211D is equal to or larger than the plate thickness t of the plate material 250D even when the burner nozzle 220 is offset in this way. use. In other words, the pin member 230 is used so as to have a length that is flush with or protrudes from the inner peripheral surface of the plate material 250D even when the burner nozzle 220 is offset. Therefore, even if the burner nozzle 220 is offset from the burner main body 210, the plate material 250 is configured so as not to come off from the pin member 230.

According to this embodiment, the following effects are obtained.
The method for repairing the burner 21 according to the present embodiment includes a removal step of removing a predetermined portion 224 including a damaged portion 223 generated in the main body wall portion 211A of the burner main body 210 from the main body wall portion 211A of the burner main body 210, and a predetermined portion. A manufacturing process in which a repair material 240 having a shape corresponding to the defective portion 225 formed on the main body wall portion 211A by 224 is provided on the plate material 250A having a shape along the inner peripheral surface of the main body wall portion 211A, and the repair material 240 is provided on the defective portion 225. Since the plate material 250A is provided with a connection step of connecting the plate material 250A to the inner peripheral surface of the main body wall portion 211A in the state of being located at the above position, even if the main body wall portion 211A of the burner main body 210 has a damaged portion 223. The repair material 240 can be applied to the defective portion 225 of the main body wall portion 211A formed by removing the entire damaged portion 223 as a predetermined portion 224 from the burner main body and removing the predetermined portion 224. Therefore, for example, even if a damaged portion 223 that is too large to be repaired by the putty material alone is generated in the burner main body 210, it can be repaired quickly and by a simple method.

Further, since the plate material 250 to which the repair material 240 is attached is connected to the inner peripheral surface of the main body wall portion 211, the repair material 240 does not change the outer shape of the main body wall portion 211, that is, the outer shape of the burner main body 210. Can be indirectly attached to the main body wall portion 211 (defective portion 225) of the burner main body 210. Therefore, when another component (for example, a burner nozzle 220 or the like) is provided around the burner main body 210, there are no restrictions on the attachment or operation of the other component.

Further, since the step of providing the filler 260 at the boundary between the burner main body 210 and the plate material 250 and / or the boundary between the burner main body 210 and the repair material 240 after the connection step is provided, the burner main body 210 and the plate material are provided. The shape change portion (step, gap, etc.) that may occur between the 250 and / or the shape change portion (step, gap, etc.) that may occur between the burner body 210 and the repair material 240 is smoothed by the filler 260. It can be molded into a shape. The filler 260 is a putty material such as a ceramic putty.

Further, the burner main body 210 has a square tubular shape in which the main body wall portion 211 on the opening end side located on the downstream side in the flow direction of the mixed gas has four surfaces, and the plate material 250 has at least the inner peripheral surface of the main body wall portion 211. Since it is formed so as to be in contact with the three surfaces, the plate material 250 can be stably connected to the inner peripheral surface of the main body wall portion 211. Further, for example, when the plate material 250 is formed so as to be in contact with the inner peripheral surfaces of all the main body wall portions 211, the displacement of the plate material 250 in all directions is regulated by the inner peripheral surfaces of the main body wall portion 211. It is possible to suppress possible thermal deformation.

Further, the burner 21 includes a tubular burner nozzle 220 that guides the mixed gas flowing out from the burner main body 210 and the combustion air into the furnace, and the burner nozzle 220 is a cylinder that surrounds the outer peripheral surface of the burner main body 210 on the open end side. The burner nozzle 220 is rotatably connected to the burner main body 210 with the pin member 230 provided on each of the two main body wall portions 211B and 211D facing each other as a fulcrum, and the plate material 250 is connected to the pin member 230. Since it is connected to the inner peripheral surface of the main body wall portion 211, the plate material 250 can be connected to the main body wall portion 211 by using the pin member 230 for connecting the movable burner nozzle 220 to the burner main body 210. .. Thereby, the plate material 250 can be connected to the main body wall portion 211 regardless of the material of the burner main body 210. For example, even if the burner main body 210 is made of cast steel that is unsuitable for welding, the plate material 250 can be connected to the main body wall portion 211 without welding.

Further, when the main body wall portion 211 (for example, 211B) into which one pin member 230 is inserted comes closest to the burner nozzle 220 in the insertion direction of the pin member 230, the main body wall portion 211 (for example, the main body wall portion 211 into which the other pin member 230 is inserted) is inserted. For example, by setting the dimensions of the pin member 230 such that the protrusion amount p of the pin member 230 protruding from the inner peripheral surface of 211D) is equal to or larger than the plate thickness t of the plate material 250 (for example, 250D), the burner nozzle 220 can be used as the burner body 210. The plate material 250 does not come off from the pin member 230 even if it is offset. Therefore, even if the burner nozzle 220 is offset from the burner main body 210, the plate material 250 does not fall off from the burner main body 210.

[Second Embodiment]
Hereinafter, the second embodiment of the present disclosure will be described.
This embodiment differs from the first embodiment in that the repair material 240 is not used. Therefore, the same components are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 19, in the main body wall portion 211A, the damaged portion 223 caused by the use of the burner 21 can be the defective portion 225 of the main body wall portion 211A. By setting the damaged portion 223 itself as the defective portion 225 in this way, the removal step of cutting the predetermined portion 224 from the main body wall portion 211A can be omitted.

As in the first embodiment, the predetermined portion 224 including the damaged portion 223 may be cut from the main body wall portion 211A to form the defective portion 225.

Next, as shown in FIG. 20, the plate material 250 is applied to the main body wall portion 211 so as to cover the defective portion 225.
At this time, the repair material 240 is not provided on the defective portion 225. This is useful, for example, when the area of the defective portion 225 is smaller than the area of the main body wall portion 211A, or when the defective portion 225 is merely a wall thinning or a crack.

The step of smoothing the shape-changing portion that may occur between the burner main body 210 and the plate material 250 by using the connecting step and the filler 260 is the same as that of the first embodiment described above.

According to this embodiment, the following effects are obtained.
In the method of repairing the burner 21 according to the present embodiment, a plate material 250 along the inner peripheral surface of the main body wall portion 211 of the burner main body 210 is used as a main body so as to cover the defective portion 225 formed on the main body wall portion 211 of the burner main body 210. Since the connection step of connecting to the inner peripheral surface of the wall portion 211 is provided, even if the defective portion 225 occurs in the main body wall portion 211A of the burner main body 210, the defective portion 225 is on the inner peripheral surface side. The plate material 250 can be applied from. Therefore, the defective portion 225 can be repaired quickly and by a simple method.

Further, since the plate material 250 is connected to the inner peripheral surface of the main body wall portion 211, the outer shape of the main body wall portion 211, that is, the outer shape of the burner main body 210 is not changed. Therefore, when another component (for example, a burner nozzle 220 or the like) is provided around the burner main body 210, there are no restrictions on the attachment or operation of the other component.

Further, since the step of providing the filler 260 at the boundary between the burner main body 210 and the plate material 250 is provided after the connection step, the shape change portion (step, gap, etc.) that may occur between the burner main body 210 and the plate material 250 is provided. ) Can be formed into a smooth shape by the filler 260. The filler 260 is a putty material such as a ceramic putty.

Further, the burner main body 210 has a square tubular shape in which the main body wall portion 211 on the opening end side located on the downstream side in the flow direction of the mixed gas has four surfaces, and the plate material 250 has at least the inner peripheral surface of the main body wall portion 211. Since it is formed so as to be in contact with the three surfaces, the plate material 250 can be stably connected to the inner peripheral surface of the main body wall portion 211. Further, for example, when the plate material 250 is formed so as to be in contact with the inner peripheral surfaces of all the main body wall portions 211, the displacement of the plate material 250 in all directions is regulated by the inner peripheral surfaces of the main body wall portion 211. It is possible to suppress possible thermal deformation.

Further, the burner 21 includes a tubular burner nozzle 220 that guides the mixed gas flowing out from the burner main body 210 and the combustion air into the furnace, and the burner nozzle 220 is a cylinder that surrounds the outer peripheral surface of the burner main body 210 on the open end side. The burner nozzle 220 is rotatably connected to the burner main body 210 with the pin member 230 provided on each of the two main body wall portions 211B and 211D facing each other as a fulcrum, and the plate material 250 is connected to the pin member 230. Since it is connected to the inner peripheral surface of the main body wall portion 211, the plate material 250 can be connected to the main body wall portion 211 using the pin member 230 for connecting the movable burner nozzle 220 to the burner main body 210 as a rotation fulcrum. can. Thereby, the plate material 250 can be connected to the main body wall portion 211 regardless of the material of the burner main body 210. For example, even if the burner main body 210 is made of cast iron that is unsuitable for welding, the plate material 250 can be connected to the main body wall portion 211 without welding.

Further, when the main body wall portion 211 (for example, 211B) into which one pin member 230 is inserted comes closest to the burner nozzle 220 in the insertion direction of the pin member 230, the main body wall portion 211 (for example, the main body wall portion 211 into which the other pin member 230 is inserted) is inserted. For example, by setting the dimensions of the pin member 230 such that the protrusion amount p of the pin member 230 protruding from the inner peripheral surface of 211D) is equal to or larger than the plate thickness t of the plate material 250 (for example, 250D), the burner nozzle 220 can be used as the burner body 210. The plate material 250 does not come off from the pin member 230 even if it is offset. Therefore, even if the burner nozzle 220 is offset from the burner main body 210, the plate material 250 does not fall off from the burner main body 210.

Further, when the defective portion 225 is a damaged portion 223 generated on the main body wall portion 211 of the burner main body 210, for example, the damaged portion 223 such as wear and burn caused by the use of the burner 21 can be easily repaired with the plate material 250. can.

Further, when the defective portion 225 is formed by removing the predetermined portion 224 including the damaged portion 223 from the wall portion, for example, the damaged portion 223 such as wear and burn caused by the use of the burner 21 is completely removed from the main body wall portion 211. The defective portion 225 can be repaired with the plate material 250 after removing the defective portion 225.

The first embodiment described as described above is grasped as follows, for example.
That is, the method for repairing the burner (21, 22, 23, 24, 25) according to one aspect of the present disclosure is a burner (21,) including a tubular burner body (210) through which a mixed gas containing fuel flows. 22, 23, 24, 25), the burner main body (210) is a predetermined portion (224) including a damaged portion (223) generated in the wall portion (211) of the burner main body (210). A repair material (240) having a shape corresponding to the removal step of removing from the wall portion (211) and the defective portion (225) formed on the wall portion (211) by the predetermined portion (224) is provided on the wall portion. The manufacturing process of providing the plate material (250) having a shape along the inner peripheral surface of (211), and the plate material (250) being placed on the wall portion (250) in a state where the repair material (240) is located at the defective portion (225). 211) is provided with a connection step of connecting to the inner peripheral surface.

In the method of repairing the burner (21, 22, 23, 24, 25) according to this aspect, a predetermined portion (224) including a damaged portion (223) generated in the wall portion (211) of the burner main body (210) is burned. A repair material (240) having a shape corresponding to the removal step of removing from the wall portion (211) of the main body (210) and the defective portion (225) formed on the wall portion (211) by the predetermined portion (224) is provided on the wall portion. The manufacturing process provided on the plate material (250) having a shape along the inner peripheral surface of (211), and the plate material (250) inside the wall portion (211) with the repair material (240) located at the defective portion (225). Since it is provided with a connection process for connecting to the peripheral surface, even if a damaged portion (223) is generated on the wall portion (211) of the burner main body (210), the entire damaged portion (223) is covered. A repair material (240) can be applied to the defective portion (225) of the wall portion (211) formed by removing the predetermined portion (224) from the burner main body (210) and removing the predetermined portion (224). .. Therefore, for example, even if a damaged portion (223) that is too large to be repaired by the putty material alone is generated in the burner main body (210), it can be repaired quickly and by a simple method.
Further, since the plate material (250) provided with the repair material (240) is connected to the inner peripheral surface of the wall portion (211), the outer shape of the wall portion (211), that is, the outer shape of the burner main body (210). The repair material (240) can be indirectly attached to the wall portion (211) of the burner main body (210) without changing the above. Therefore, when another component (for example, a burner nozzle (220)) is provided around the burner main body (210), the attachment and operation of the other component are not restricted.

Further, in the method of repairing the burner (21, 22, 23, 24, 25) according to one aspect of the present disclosure, after the connection step, the boundary between the burner main body (210) and the plate material (250), and / Alternatively, the step of providing the filler (260) at the boundary between the burner main body (210) and the repair material (240) is provided.

The method for repairing the burner (21, 22, 23, 24, 25) according to this aspect is the boundary between the burner main body (210) and the plate material (250) and / or the burner main body (210) after the connection step. Since the step of providing the filler (260) at the boundary with the repair material (240) is provided, the shape change portion (step, gap, etc.) that may occur between the burner main body (210) and the plate material (250), And / or, the shape change portion (step, gap, etc.) that may occur between the burner main body (210) and the repair material (240) can be formed into a smooth shape by the filler (260). The filler (260) is a putty material such as a ceramic putty.

Further, in the method for repairing the burner (21, 22, 23, 24, 25) according to one aspect of the present disclosure, the burner main body (210) is the open end side located on the downstream side in the flow direction of the mixed gas. The wall portion (211) has a square tubular shape composed of four surfaces, and the plate material (250) is formed so as to be in contact with at least three surfaces of the inner peripheral surface of the wall portion (211).

In the method for repairing the burner (21, 22, 23, 24, 25) according to this aspect, the burner main body (210) has 4 wall portions (211) on the opening end side located on the downstream side in the flow direction of the mixed gas. Since the plate material (250) is formed to be in contact with at least three surfaces of the inner peripheral surface of the wall portion (211), the plate material (250) is formed to be in contact with at least three surfaces of the inner peripheral surface of the wall portion (211). It can be stably connected to the surface. Further, for example, when the plate material (250) is formed so as to be in contact with the inner peripheral surface of all the wall portions (211), the displacement of the plate material (250) in all directions is regulated by the inner peripheral surface of the wall portion (211). Therefore, it is possible to suppress the thermal deformation that may occur in the plate material (250).

Further, in the method for repairing the burner (21, 22, 23, 24, 25) according to one aspect of the present disclosure, the burner brings the mixed gas flowing out from the burner main body (210) and the combustion air into the furnace. A guide burner nozzle (220) is provided, and the burner nozzle (220) has a tubular shape that surrounds the outer peripheral surface of the burner body (210) on the opening end side, and the burner body (210) and the burner nozzle (220). Is rotatably connected with two pin members (230) as fulcrums at opposite positions, and the plate member (250) is connected to the inner peripheral surface of the wall portion (211) by the pin member (230). Has been done.

In the method for repairing the burner (21, 22, 23, 24, 25) according to this aspect, the burner includes a burner nozzle (220) that guides the mixed gas flowing out from the burner main body (210) and the combustion air into the furnace. The burner nozzle (220) has a tubular shape that surrounds the outer peripheral surface of the burner main body (210) on the open end side, and the burner nozzle (220) is a pin member provided on each of the two facing wall portions (211). It is rotatably connected to the burner main body (210) with (230) as a fulcrum, and the plate material (250) is connected to the inner peripheral surface of the wall portion (211) by the pin member (230), so that it is movable. The plate material (250) can be connected to the wall portion (211) using the pin member (230) for connecting the burner nozzle (220) of the formula to the burner main body (210) as a rotation fulcrum. Thereby, the plate material (250) can be connected to the wall portion (211) regardless of the material of the burner main body (210). For example, even if the burner body (210) is made of cast iron that is unsuitable for welding, the plate material (250) can be connected to the wall portion (211) without welding.

Further, in the method for repairing the burner (21, 22, 23, 24, 25) according to one aspect of the present disclosure, the wall portion (211) provided with the pin member (230) is the pin member (230). ), The pin member (230) protrudes from the inner peripheral surface of the wall portion (211) into which the other pin member (230) is inserted when the burner nozzle (220) is closest to the burner nozzle (220). The dimensions of the pin member (230) are set so that the amount is equal to or greater than the plate thickness of the plate material (250).

In the method for repairing the burner (21, 22, 23, 24, 25) according to this aspect, the wall portion (211) into which one pin member (230) is inserted inserts the burner nozzle (220) in the insertion direction of the pin member (230). ), The protrusion amount of the pin member (230) protruding from the inner peripheral surface of the wall portion (211) into which the other pin member (230) is inserted becomes equal to or larger than the plate thickness of the plate material (250). By setting the dimensions of the pin member (230) as described above, the plate material (250) does not come off from the pin member (230) even if the burner nozzle (220) is offset with respect to the burner main body (210). Therefore, even if the burner nozzle (220) is offset with respect to the burner main body (210), the plate material (250) does not fall off from the burner main body (210).

Further, the burner (21, 22, 23, 24, 25) according to one aspect of the present disclosure has a tubular shape surrounded by a wall portion (211), and a predetermined portion (224) of the wall portion (211) is formed. The removed burner main body (210), a plate material (250) connected to the inner peripheral surface of the wall portion (211) along the inner peripheral surface of the wall portion (211), and the predetermined portion (224). The repair material (240) provided on the plate material (250) in a state of being positioned at the defective portion (225) and having a shape corresponding to the defective portion (225) formed on the wall portion (211). It is equipped with.

Further, the boiler (10) according to one aspect of the present disclosure includes the above-mentioned burners (21, 22, 23, 24, 25).

Further, the power plant according to one aspect of the present disclosure includes the above-mentioned boiler (10) and a power generation unit that generates power using the steam generated by the boiler (10).

10 Coal-fired boiler (boiler)
11 Fireplace 12 Combustion device 13 Combustion gas passage 14 Flue 21, 22, 23, 24, 25 Burner 26, 27, 28, 29, 30 Milled pulverized coal supply pipe 31, 32, 33, 34, 35 Crusher (mill)
36 Wind box 37 Air duct (air duct)
38 Push-in ventilator (FDF)
41 Gas duct 42 Air heater (air preheater)
43 Denitration device 44 Dust collector 45 Ventilator (IDF)
46 Desulfurization equipment 50 Chimney 101 Fireplace wall 102 First superheater (heat exchanger)
103 Second superheater (heat exchanger)
104 Third superheater (heat exchanger)
105 1st reheater (heat exchanger)
106 Second reheater (heat exchanger)
107 Economizer (heat exchanger)
210 Burner main body 211 (211A, 211B, 211C, 211D) Main body wall part (wall part)
220 Burner Nozzle 221 Nozzle outer wall 222 Nozzle inner wall 223 Damaged part 224 Prescribed part 225 Missing part 230 Pin member 240 Repair material 250 (250A, 250B, 250C, 250D) Plate material 252 Connection plate material 260 Filling material MP1 Main body side Primary flow path MP2 Main body side 2 Next flow path NP1 Nozzle side primary flow path NP2 Nozzle side secondary flow path

Claims (8)

It is a method of repairing a burner equipped with a cylindrical burner body through which a mixed gas containing fuel flows.
A removal step of removing a predetermined portion including a damaged portion generated on the wall portion of the burner main body from the wall portion of the burner main body.
A manufacturing process in which a repair material having a shape corresponding to a defective portion formed on the wall portion by the predetermined portion is provided on a plate material having a shape along the inner peripheral surface of the wall portion.
A connection step of connecting the plate material to the inner peripheral surface of the wall portion while the repair material is located at the defective portion.
How to repair a burner equipped with. The repair of the burner according to claim 1, further comprising a step of providing a filler at the boundary between the burner main body and the plate material and / or the boundary between the burner main body and the repair material after the connection step. Method. The burner main body has a square tubular shape having four surfaces of the wall portion on the opening end side located on the downstream side in the flow direction of the mixed gas.
The method for repairing a burner according to claim 1 or 2, wherein the plate material is formed so as to be in contact with at least three surfaces of the inner peripheral surface of the wall portion. The burner is provided with a burner nozzle that guides the mixed gas flowing out from the burner body and the combustion air into the furnace.
The burner nozzle has a cylindrical shape that surrounds the outer peripheral surface of the burner body on the open end side.
The burner body and the burner nozzle are rotatably connected with two pin members as fulcrums at opposite positions.
The method for repairing a burner according to claim 3, wherein the plate material is connected to the inner peripheral surface of the wall portion by the pin member. When the wall portion provided with one pin member comes closest to the burner nozzle in the insertion direction of the pin member, the pin projecting from the inner peripheral surface of the wall portion into which the other pin member is inserted. The method for repairing a burner according to claim 4, wherein the dimensions of the pin member are set so that the protruding amount of the member is equal to or larger than the plate thickness of the plate material. A cylindrical body surrounded by a wall, and a burner body from which a predetermined part of the wall has been removed.
A plate material connected to the inner peripheral surface of the wall portion along the inner peripheral surface of the wall portion, and
A repair material provided on the plate material in a state of being positioned in the defective portion and having a shape corresponding to the defective portion formed in the wall portion by the predetermined portion.
Burner with. The boiler provided with the burner according to claim 6. The boiler according to claim 7 and
A power generation unit that generates electricity using the steam generated by the boiler,
Power plant equipped with.

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