JP2018169112A - Burner - Google Patents

Abstract

To provide a cooling pipe that includes wear resistance while being imparted with corrosion resistance and thermal fatigue resistance.SOLUTION: A burner includes: a nozzle 1; an external cylinder 2 for covering so as to surround an external surface of the nozzle 1 by opening a side of a tip 1a of the nozzle 1 oriented on an inside of a furnace; a cooling pipe 3 wound around the external cylinder 2; and an alloy film 4 in which the external cylinder 2 is bonded to at least a surface 3a in an inner peripheral direction of wound of the cooling pipe 3 disposed on the side of the tip 1a of the nozzle 1 via a boundary face reaction layer.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a burner used in a combustion furnace such as a gasifier.

  For example, Patent Document 1 discloses a burner. This burner burns coal char and pulverized coal as fuel. In the burner, a burner primary pipe (nozzle) is disposed inside a burner secondary pipe (outer cylinder). In this burner, a cooling pipe is wound around the burner secondary pipe. The cooling pipe is supplied with cooling water to cool the burner.

JP 2014-152988 A

  In the burner as shown in Patent Document 1, with respect to the cooling pipe, in stainless steel, due to the temperature difference between the inner face and the outer face of the cooling pipe, a difference in thermal expansion occurs between the inner and outer faces of the pipe, and thermal stress acts. That is, if the inner surface of the cooling pipe is cold and the outer surface is hot, the outer surface becomes stretched. When this state is repeated, a fatigue event occurs. The reason why the thermal stress difference occurs repeatedly due to the difference in thermal elongation is due to slag desorption on the surface of the cooling pipe or temperature fluctuation on the pipe outer surface side. There is a problem in fatigue strength against thermal fatigue caused by the action of such thermal stress, and there is a problem that low alloy steel has insufficient corrosion resistance against hydrogen sulfide. For this reason, Ni-based alloys (for example, Inconel 625 and Inconel 600) that are excellent in thermal conductivity and corrosion resistance are employed. However, even when a Ni-base alloy cooling pipe is used, there is a concern about wear due to the collision of the burner jet (char or pulverized coal), and therefore measures for extending the life are required in the target area of the burner jet collision. . Examples of countermeasures against the burner jet collision include overlay welding, thermal spray coating, or protector installation. However, overlay welding is difficult to construct because the thickness of the cooling pipe is thin, and the thermal spray coating has a problem of peeling due to the difference in thermal elongation between the cooling pipe and the coating. Moreover, it is difficult to install the protector in terms of heat resistance.

  This invention solves the subject mentioned above, and it aims at providing the burner which can provide abrasion resistance, providing corrosion resistance and heat fatigue resistance about a cooling pipe.

  In order to achieve the above-mentioned object, a burner according to an aspect of the present invention includes a burner nozzle and an outer cylinder that covers the burner nozzle so as to surround the outer surface of the burner nozzle by opening a tip side facing the furnace. The outer cylinder is joined via an interface reaction layer to the cooling pipe wound around the outer cylinder and at least the inner circumferential surface of the cooling pipe wound on the tip side of the burner nozzle. And an alloy film.

  In this burner, by disposing an alloy film between the cooling pipe and the outer cylinder, the cooling pipe and the outer cylinder can be brought into contact with each other via the alloy film. Thereby, the area | region which heat | fever transfers can be enlarged more than the case where the cooling pipe and the outer cylinder are in contact with a point. That is, the part through which the combustion air passes between the cooling pipe and the outer cylinder can be filled with the alloy film, and heat can be transmitted between the cooling pipe and the outer cylinder via the alloy film. Thereby, an outer cylinder can be cooled more efficiently with a cooling pipe, and the temperature rise of an outer cylinder can be suppressed. Thereby, generation | occurrence | production of the high temperature corrosion which arises when the front-end | tip side of the burner nozzle especially facing the inside of an outer cylinder is exposed to the high temperature combustion gas or high temperature gasification gas in a furnace can be suppressed. By integrating the cooling pipe and the outer cylinder, it is possible to improve the installation accuracy with respect to the mounting position of the burner with respect to the furnace and the cooling pipe with respect to the outer cylinder.

  In the burner according to one embodiment of the present invention, the interface reaction layer is a region in which a metal of a cooling pipe and a metal of the alloy film are mixed.

  In this burner, the interface reaction layer is a region where the metal of the cooling pipe and the metal of the alloy film are mixed, and the constituent elements of the alloy film and the cooling pipe are diffused and dissolved by the interface reaction, so that the cooling pipe is metallurgically metallized. And the alloy film are joined and connected in a planar shape. Thereby, it joins metallurgically and it becomes one metal, and since heat insulation layers, such as a clearance gap and a space | gap, are lose | eliminated, a heat transfer rate improves.

  In the burner according to one aspect of the present invention, the alloy film is preferably provided on the entire surface of the cooling pipe.

  Compared to the base material of the cooling pipe, this burner can suppress the deterioration of corrosion resistance and wear resistance on the entire surface of the cooling pipe by providing an alloy film with corrosion resistance and wear resistance on the entire surface of the cooling pipe. An inexpensive metal can be used.

  In the burner according to one aspect of the present invention, it is preferable that the alloy film is provided by filling a gap between adjacent cooling pipes by winding.

  This burner fills the gap between adjacent cooling pipes by winding with an alloy film, so that the cooling pipe and the alloy film are integrated, with the conventional point contact and gap structure, through the alloy film, Since the thermal conductivity between the cooling pipes is improved, a more effective cooling effect can be obtained for the outer cylinder.

  Moreover, in the burner which concerns on 1 aspect of this invention, it is preferable that the said alloy film contacts the outer surface of the said outer cylinder in a surface.

  In this burner, when the alloy film comes into contact with the outer surface of the outer cylinder in a surface, the heat transfer property is improved, and more effective cooling is possible.

  In the burner according to one aspect of the present invention, the alloy film is bonded to at least the inner surface of the winding of the cooling pipe via the interface reaction layer, and the interface reaction layer is formed on the outer surface of the outer cylinder. It is preferable that the cooling pipe and the outer cylinder be joined together.

  In this burner, the alloy film is bonded to both the cooling pipe and the outer cylinder through an interface reaction layer. Thereby, since a cooling pipe and an outer cylinder will be in surface contact through an alloy film, the heat transfer between an outer cylinder and a cooling pipe can be performed more efficiently, and an outer cylinder is cooled more effectively. be able to. As a result, durability can be improved by reducing the temperature of the tip 2a of the outer cylinder 2.

  In the burner according to one aspect of the present invention, it is preferable that the cooling pipe has an opposing surface that faces the outer surface of the outer cylinder on the inner surface of the winding.

  In this burner, since the cooling pipe is in surface contact with the outer cylinder, the area directly contacted by the cooling pipe and the outer cylinder is improved, and the burner can be in a state of being easily contacted. Thereby, the adhesiveness and the cooling area can be improved, and more effective cooling is possible.

  ADVANTAGE OF THE INVENTION According to this invention, abrasion resistance can be provided, providing corrosion resistance and heat fatigue resistance about a cooling pipe.

FIG. 1 is a schematic diagram showing a schematic configuration of a gasifier having a burner according to the present embodiment. FIG. 2 is a side sectional view of the burner according to the present embodiment. FIG. 3 is a schematic enlarged cross-sectional view of the alloy film portion of the burner according to this embodiment. FIG. 4 is a partially enlarged cross-sectional view of the burner according to the present embodiment. FIG. 5 is a side sectional view of another example of the burner according to the present embodiment. FIG. 6 is a side sectional view of another example of the burner according to the present embodiment. FIG. 7 is a schematic enlarged cross-sectional view of an alloy film portion of another example of the burner according to the present embodiment. FIG. 8 is a partially enlarged sectional view of the burner according to the present embodiment. FIG. 9 is a partially enlarged cross-sectional view of the burner according to the present embodiment.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same. In the following embodiment, the case where the burner is arranged in the gasification furnace of the gasification apparatus will be described, but it can also be used as a burner for combustion equipment other than the gasification furnace.

  First, a gasifier having a burner according to this embodiment will be described with reference to FIG. FIG. 1 is a schematic diagram showing a schematic configuration of a gasifier having a burner according to the present embodiment. The gasifier 100 gasifies the supplied solid fuel. As the fuel supplied to the gasifier 100, for example, a carbon-containing solid fuel such as coal is used. The gasifier 100 is applied to, for example, an integrated coal gasification combined cycle (IGCC). The coal gasification combined power generation facility uses air as an oxidant, and the gasification apparatus 100 employs an air combustion system that generates a generated gas from fuel. The coal gasification combined power generation facility performs power generation by refining the product gas generated by the gasification device 100 by using a gas purification device to produce fuel gas, and then supplying the fuel gas to the gas turbine facility. That is, the combined coal gasification combined power generation facility of the present embodiment is an air combustion type (air blowing) power generation facility.

  The gasifier 100 is supplied with pulverized coal produced by a coal feeder, and char (collected unreacted and ash) recovered by a char recovery device is returned and supplied for reuse. . The inert gas is an inert gas having an oxygen content of about 5% by volume or less, and representative examples thereof include nitrogen gas, carbon dioxide gas, and argon gas, but are not necessarily limited to about 5% or less.

  Although not shown in the drawing, the gasifier 100 is connected to a compressed air supply line from a gas turbine facility (compressor), and can supply compressed air compressed by the gas turbine facility. The gasifier 100 is connected to an air separation device. The air separation device separates and generates nitrogen and oxygen from air in the atmosphere, and a first nitrogen supply line and an oxygen supply line are connected to each other. The first nitrogen supply line is connected to the gasifier 100. In addition, the first nitrogen supply line is branched and connected to the second nitrogen supply line in the middle, and a coal supply line from the coal supply device is further connected to the gasifier 100. A second nitrogen supply line branched from the first nitrogen supply line is also connected to the gasifier 100. The char return line from the char recovery device is connected to the second nitrogen supply line in the middle. The oxygen supply line is connected to the gasifier 100 via the compressed air supply line. And the nitrogen isolate | separated by the air separation apparatus distribute | circulates a 1st nitrogen supply line and a 2nd nitrogen supply line, and is utilized as a gas for conveyance of coal or char. Further, oxygen separated by the air separation device is used as an oxidant in the gasifier 100 by flowing through the oxygen supply line and the compressed air supply line. Further, the air separation device is connected to the compressed air supply line by an oxygen supply line.

  As shown in FIG. 1, the gasifier 100 includes a gasifier 101 and a heat exchanger 102. The gasification furnace 101 is formed so as to extend in the vertical direction, and pulverized coal and oxygen are supplied to the lower side in the vertical direction, and the combustible gas (product gas) gasified by partial combustion is the lower side in the vertical direction. From the top to the top. The gasification furnace 101 includes a pressure vessel 110 and a gasification furnace wall 111 provided inside the pressure vessel 110. In the gasification furnace 101, an annulus portion 115 is formed in a space between the pressure vessel 110 and the gasification furnace wall 111. Further, the gasification furnace 101 has a combustor unit 116, a diffuser unit 117, and a reductor unit 118 in order from the lower side in the vertical direction (that is, the upstream side in the flow direction of the product gas) in the space inside the gasification furnace wall 111. Is forming.

  The pressure vessel 110 is formed in a cylindrical shape having a hollow space inside, a gas discharge port 121 is formed at the upper end portion, and a slag hopper 122 is formed at the lower end portion (bottom portion). The gasification furnace wall 111 is formed in a cylindrical shape whose inside is a hollow space, and the wall surface thereof is provided to face the inner surface of the pressure vessel 110. In this embodiment, the pressure vessel 110 has a cylindrical shape, and the gasification furnace wall 111 is formed in a polygonal cylindrical shape or a cylindrical shape. The gasification furnace wall 111 is connected to the inner surface of the pressure vessel 110 by a support member (not shown).

  The gasification furnace wall 111 is a cylindrical member that separates the inside of the pressure vessel 110 into an internal space 154 and an external space 156. The gasification furnace wall 111 is not a cylinder whose cross-sectional shape does not change, but is partially provided with unevenness and an aperture. The upper end of the gasification furnace wall 111 is connected to the gas discharge port 121 of the pressure vessel 110, and the lower end thereof is provided with a gap from the bottom of the pressure vessel 110. The slag hopper 122 formed at the bottom of the pressure vessel 110 stores stored water, and the lower end of the gasification furnace wall 111 is immersed in the stored water, thereby sealing the inside and outside of the gasification furnace wall 111. It has stopped. Burners 126 and 127 are inserted into the gasification furnace wall 111, and the heat exchanger 102 is disposed in the internal space 154. The structure of the burners 126 and 127 will be described later.

  The annulus portion 115 is a space formed inside the pressure vessel 110 and outside the gasification furnace wall 111, that is, an external space 156, and nitrogen, which is an inert gas separated by an air separation device as described above, It is supplied through the first nitrogen supply line and the second nitrogen supply line. For this reason, the annulus portion 115 becomes a space filled with nitrogen. An in-furnace pressure equalizing tube (not shown) for equalizing the pressure in the gasification furnace 101 is provided in the vicinity of the upper portion of the annulus portion 115 in the vertical direction. The pressure equalizing tube in the furnace is provided so as to communicate between the inside and outside of the gasification furnace wall 111, and the inside of the gasification furnace wall 111 (the combustor portion 116, the diffuser portion 117 and the reductor portion 118) and the outside (the annulus portion 115) are leveled. Pressure.

  The combustor unit 116 is a space for partially burning pulverized coal, char and air, and a combustion apparatus including a plurality of burners 126 is disposed on the gasification furnace wall 111 in the combustor unit 116. The high-temperature combustion gas obtained by burning part of the pulverized coal and char in the combustor unit 116 passes through the diffuser unit 117 and flows into the reductor unit 118.

  The reductor unit 118 is maintained at a high temperature necessary for the gasification reaction and supplies pulverized coal to the combustion gas from the combustor unit 116 to convert the pulverized coal into volatile components (carbon monoxide, hydrogen, lower hydrocarbons, etc.). It is a space that is pyrolyzed and gasified to generate a combustible gas, and a combustion apparatus including a plurality of burners 127 is disposed on the gasification furnace wall 111 in the reductor unit 118.

  The heat exchanger 102 is provided inside the gasification furnace wall 111 and is provided above the burner 127 of the reductor unit 118 in the vertical direction. The heat exchanger 102 is, in order from the lower side in the vertical direction of the gasification furnace wall 111 (upstream side in the flow direction of the product gas), an evaporator 131, a superheater (super heater) 132, and a economizer (economizer). ) 134 is arranged. These heat exchangers 102 cool the generated gas by exchanging heat with the generated gas generated in the reductor unit 118. Further, the quantity of the evaporator (evaporator) 131, the superheater (superheater) 132, and the economizer 134 is not limited.

  Here, the operation of the gasifier 100 of the present embodiment described above will be described. In the gasifier 101 in the gasifier 101, nitrogen and pulverized coal are charged and ignited by the burner 127 of the reductor unit 118, and pulverized coal, char and compressed air (oxygen) are charged by the burner 126 of the combustor unit 116. Is ignited. Then, in the combustor unit 116, high-temperature combustion gas is generated by the combustion of pulverized coal and char. Further, in the combustor section 116, molten slag is generated in the high-temperature gas by the combustion of pulverized coal and char, and this molten slag adheres to the gasification furnace wall 111 and falls to the furnace bottom, and finally in the slag hopper 122. Discharged into the water storage. Then, the high-temperature combustion gas generated in the combustor unit 116 rises to the reductor unit 118 through the diffuser unit 117. In this reductor unit 118, the high temperature state necessary for the gasification reaction is maintained, the pulverized coal is mixed with the high temperature combustion gas, and the pulverized coal is volatile (carbon monoxide, hydrogen, lower hydrocarbons) in a high temperature reducing atmosphere field. Etc.) and a gasification reaction is carried out to produce a combustible gas (product gas). Gasified combustible gas (product gas) flows from the lower side to the upper side in the vertical direction.

  Next, the structure of the burner will be described with reference to FIGS. 2 to 4 in addition to FIG. Here, since the burner 126 and the burner 127 have the same structure, the burner 10 will be described below. FIG. 2 is a side sectional view of the burner according to the present embodiment. FIG. 3 is a schematic enlarged cross-sectional view of the alloy film portion of the burner according to this embodiment. FIG. 4 is a partially enlarged cross-sectional view of the burner according to the present embodiment.

  As shown in FIG. 2, the burner 10 of the present embodiment is inserted into the inside of the furnace H that passes through the pressure vessel 110 and the gasification furnace wall 111 (see FIG. 1) and has a high temperature inside, as described above. Has been. The burner 10 includes a nozzle (burner nozzle) 1, an outer cylinder (secondary air pipe) 2, a cooling pipe 3, an alloy film 4, and swirl vanes 5.

  The nozzle 1 injects primary air and fuel (char and pulverized coal). The nozzle 1 is arranged in such a direction that the tip 1a side which is an injection port faces the inside of the furnace H. The outer cylinder 2 supplies secondary air, and is provided so as to open the tip 1 a side of the nozzle 1 and cover the outside of the nozzle 1. The outer cylinder 2 is disposed so as to surround the periphery of the nozzle 1. That is, in the burner 10, the nozzle 1 and the outer cylinder 2 are double pipes. The burner 10 of the present embodiment is a double cylindrical tube in which the nozzle 1 and the outer cylinder 2 are arranged so that their center lines CL coincide with each other. The outer tube 2 has a tip 2 a that is an end inside the furnace H and is longer than the tip 1 a of the nozzle 1. The swirl vane 5 is provided between the nozzle 1 and the outer cylinder 2. The swirl blade 5 turns the secondary air supplied by the outer cylinder 2 into a swirl flow. The burner forms a flame in the furnace H by the fuel and air (primary air and secondary air) supplied by the nozzle 1 and the outer cylinder 2.

  Cooling water (cooling medium) flows through the cooling pipe 3. The cooling pipe 3 is wound in a spiral shape so as to surround the outer cylinder 2. Even if the cooling pipe 3 is wound around the outer cylinder 2 so that one pipe is juxtaposed along the extending direction of the outer cylinder 2, the plurality of pipes extend in the extending direction of the outer cylinder 2. It may be wound around the outer cylinder 2 so as to be arranged in parallel. The cooling pipe 3 extends from the distal end 2 a of the outer cylinder 2 to the base end (not shown) and communicates with the outside of the furnace H. The cooling water supplied from outside the furnace H flows through the cooling pipe 3 to shield heat from the inside of the furnace H to the outer cylinder 2 and cool the outer cylinder 2 to cool the tip 1 a side of the nozzle 1. The outer cylinder 2 can be protected from high heat. The cooling pipe 3 is made of, for example, a Ni-based alloy (for example, Inconel (registered trademark) 625) having excellent thermal conductivity and corrosion resistance.

  The alloy film 4 is provided on the inner surface 3 a of the winding of the cooling pipe 3. The alloy film 4 is formed integrally with the cooling pipe 3 and is in contact with the outer cylinder 2. As shown in FIG. 2, the alloy film 4 is provided on the inner surface 3 a of the winding of the cooling pipe 3 disposed on the tip 1 a side of the nozzle 1. Specifically, the alloy film 4 shown in FIG. 2 shows a form that is provided only on the inner surface 3 a of the winding of the cooling pipe 3 disposed on the tip 1 a side of the nozzle 1. Further, the alloy film 4 is provided so that the cooling pipe 3 protrudes from the tip 2a of the outer cylinder 2, and the alloy film 4 is provided on the inner surface 3a of the winding at the protruding portion.

  The alloy film 4 is a self-fluxing alloy film, and the material composition is, for example, Ni-18 to 30 wt%, Cr-5 to 10 wt%, Mo-1.5 to 3.0 wt%, Fe-1 to 6 wt%. %, B-1 to 5 wt%, and Si-1 to 5 wt%.

  The alloy of the alloy film 4 has a composition that improves the corrosion resistance and hardness of the outer cylinder 2. For the corrosion resistance of the alloy of the alloy film 4, a composition similar to that of the metal of the cooling pipe 3, for example, Inconel 625 is adopted. Moreover, the alloy of the alloy film 4 can adjust hardness and melting | fusing point by adjusting the component of B and Si. The alloy film 4 is excellent in corrosion resistance, wear resistance, thermal conductivity, and heat fatigue resistance (linear expansion coefficient). The alloy film 4 preferably has a film thickness of 100 μm or more and 5000 μm or less.

  As shown in FIG. 3, the burner 10 has an interface reaction layer 6 between the alloy film 4 and the cooling pipe 3. The interface reaction layer 6 joins the surface of the cooling pipe 3 and the alloy film 4. The interface reaction layer 6 is a region where the metal of the cooling pipe 3 and the metal of the alloy film 4 are mixed. The interfacial reaction layer 6 metallurgically joins and connects the cooling pipe 3 and the alloy film 4 by diffusing and dissolving the constituent elements of the alloy film 4 and the cooling pipe 3 by the interfacial reaction. Thereby, it joins metallurgically and it becomes one metal, and since heat insulation layers, such as a clearance gap and a space | gap, are lose | eliminated, a heat transfer rate improves.

  As shown in FIG. 2, the burner 10 of the present embodiment has an alloy film 4 bonded to at least the inner surface 3 a of the winding of the cooling pipe 3 disposed on the tip 1 a side of the nozzle 1 via the interface reaction layer 6. Have The burner 10 can contact the cooling pipe 3 and the outer cylinder 2 via the alloy film 4 by disposing the alloy film 4 between the cooling pipe 3 and the outer cylinder 2. Thereby, compared with the case where the cooling pipe 3 and the outer cylinder 2 are in contact with each other at a point, it is possible to increase the area where heat is transmitted. That is, the portion through which the combustion air passes between the cooling pipe 3 and the outer cylinder 2 can be filled with the alloy film 4, and heat is transferred between the cooling pipe 3 and the outer cylinder 2 via the alloy film 4. can do. Thereby, the outer cylinder 2 can be cooled by the cooling pipe 3 with higher efficiency, and the temperature rise of the outer cylinder 2 can be suppressed. Thereby, generation | occurrence | production of the high temperature corrosion which arises when the front-end | tip 2a side of the burner nozzle especially facing the inside of the outer cylinder 2 is exposed to the high temperature combustion gas or high temperature gasification gas in a furnace can be suppressed. By integrating the cooling pipe 3 and the outer cylinder 2, it is possible to improve the installation accuracy of the burner 10 with respect to the furnace H and the mounting position of the cooling pipe 3 with respect to the outer cylinder 2.

  Further, the burner 10 is provided with an alloy film 4 on the inner surface 3a of the winding of the cooling pipe 3 disposed on the tip 1a side of the nozzle 1 where there is a concern about wear, high temperature corrosion, and heat resistance. The cooling pipe 3 can be protected against wear and hot corrosion due to particle flow. Thereby, the wear resistance and corrosion resistance of the burner 10 can be increased, and the life of the burner 10 can be extended. Moreover, since the alloy film 4 is a metallurgical joint joined to the cooling pipe 3 through the interface reaction layer 6, the heat resistance is improved and the peeling due to the difference in thermal extension with the cooling pipe 3 is suppressed. And heat fatigue resistance. As a result, the cooling pipe 3 can be provided with wear resistance while imparting corrosion resistance and heat fatigue resistance.

  As shown in FIG. 2, the burner 10 of the present embodiment is preferably provided with the alloy film 4 filling the gaps between the adjacent cooling pipes 3 by winding. The burner 10 fills the gaps between the adjacent cooling pipes 3 with the alloy film 4 by winding, so that the cooling pipe 3 and the alloy film 4 are integrated, and the alloy film is applied to the conventional point contact and gap structure. 4, the heat conductivity between the cooling pipes 3 is improved, so that a more effective cooling effect can be obtained for the outer cylinder 2.

  As shown in FIG. 4, which is a cross-sectional view in which the burner 10 of the present embodiment is cut along a portion of the outer tube 2 on the tip 2 a side together with the cooling pipe 3 and the alloy film 4, the alloy film 4 is disposed outside the outer cylinder 2. It is preferable that the surface (inner surface) 4a contacts the surface 2b. Specifically, as shown in FIG. 4, the inner surface 4 a of the alloy film 4 is processed so as to conform to the shape of the outer surface 2 b of the outer cylinder 2 so as to be in contact with the outer surface 2 b of the outer cylinder 2. . For this reason, in the burner 10, the alloy film 2 and the outer cylinder 2 are integrated, and the thermal conductivity between the cooling pipe 3 and the outer cylinder 2 is improved via the alloy film 4. A more effective cooling effect can be obtained.

  Here, the construction of the alloy film 4 on the cooling pipe 3 will be described. First, the cooling pipe 3 is formed in a spiral shape so that it can be wound around the outer cylinder 2. The alloy film 4 is formed using amorphous alloy powder having the same composition as the alloy film 4. At the time of construction, the amorphous alloy powder is applied in a slurry form, and then heated to be sintered. Here, the slurry of the amorphous alloy powder has a viscosity of 300 cp to 2300 cp so that the powder can easily enter the gap between the cooling pipes 3 and there is no significant outflow.

  The method for forming the alloy film 4 will be described more specifically. First, a slurry of amorphous alloy powder is generated (first step). Next, the surface of the cooling pipe 3 as a base material is blasted (second step). Note that the processing order of the first step and the second step may be simultaneous or reverse. Next, a slurry of amorphous alloy powder is applied to the surface of the blasted cooling pipe 3 (third step). As the coating method, dipping in which the cooling pipe 3 is immersed in the slurry, spray wiping or brushing in which the slurry is sprayed on the cooling pipe 3 can be used. Next, the applied slurry is dried (fourth step). Drying can be performed, for example, by placing in an environment of 40 ° C. or higher and 80 ° C. or lower for 2 to 24 hours. In the method of forming the alloy film 4, the third step and the fourth step are repeatedly executed to grow the thickness of the film formed on the cooling pipe 3 to a predetermined thickness. The alloy film 4 is formed by growing the film to a predetermined thickness and then heating in an inert gas atmosphere (vacuum furnace, environmental control electric furnace, high-frequency heating using a dedicated coil, etc.) (fifth step) . By performing the heat treatment, the amorphous alloy powder becomes the alloy film 4, and the boundary portion between the cooling pipe 3 and the alloy film 4 becomes the interface reaction layer 6. By forming the alloy film 4 by the above method, a heat source at the time of application becomes unnecessary as compared with thermal spraying, and the adhesion to the substrate can be further increased.

  Here, after the burner 10 is provided with the alloy film 4 on the inner surface 3a of the winding of the cooling pipe 3 as described above, the spiral cooling pipe 3 can be installed around the outer cylinder 2 as shown in FIG. As shown in FIG. 5, the inner surface 4a of the alloy film 4 is processed so as to match the shape of the outer surface 2b of the outer cylinder 2 so as to be in contact with the outer surface 2b of the outer cylinder 2 on the surface. By comprising in this way, heat transfer property improves and more effective cooling is attained.

  Here, although the burner 10 of the said embodiment provided the alloy film 4 only between the cooling pipe 3 and the outer cylinder 2 of the front-end | tip 1a of the nozzle 1, it is not limited to this. FIG. 5 is a side sectional view of another example of the burner according to the present embodiment. The alloy film 4 of the burner 10 shown in FIG. 5 is provided with the alloy film 4 on the entire circumference of the surface of the cooling pipe 3 disposed on the tip 1 a side of the nozzle 1. The burner 10 can protect the cooling pipe 3 in addition to the outer cylinder 2 by providing the alloy film 4 on the entire circumference around the cooling pipe 3. Moreover, the adhesiveness of the alloy film 4 and the cooling pipe 3 can be made higher by arrange | positioning to the perimeter of the cooling pipe 3. FIG.

  Moreover, since the burner 10 can suppress the deterioration of the corrosion resistance and the wear resistance on the entire surface of the cooling pipe 3 by providing the alloy film 4 having corrosion resistance and wear resistance on the entire surface of the cooling pipe 3, the cooling pipe A relatively inexpensive metal (for example, a low alloy steel) can be used for the base material 3.

  FIG. 6 is a side sectional view of another example of the burner according to the present embodiment. In the burner 10 shown in FIG. 6, the alloy film 4 is provided on the entire surface of the cooling pipe 3. That is, the alloy film 4 of the burner 10 shown in FIG. 6 is formed around the other part of the cooling pipe 3 in addition to the circumference of the cooling pipe 3 arranged near the tip 2a of the outer cylinder 2 in the axial direction of the burner 10. Is also provided. Here, the alloy film 4 is preferably provided over the entire region of the cooling pipe 3 disposed in the furnace H. The burner 10 is provided with the alloy coating 4 in the axial direction of the burner 10 in addition to the periphery of the cooling pipe 3 facing the tip 2 a of the outer cylinder 2 and also around the cooling pipe 3 facing the other part of the outer cylinder 2. Thereby, the outer cylinder 2 of parts other than the front-end | tip 2a can also be cooled more efficiently. Thereby, the heat | fever of the outer cylinder 2 can be absorbed more reliably, it can suppress more reliably that the temperature of the front-end | tip 2a rises, and the high-temperature corrosion of the front-end | tip 2a can be suppressed more.

  In the embodiment described above, the alloy film 4 is provided on the cooling pipe 3 in a spiral shape. However, the cooling pipe 3 is wound around the outer cylinder 2 in a spiral shape. An alloy film 4 may be provided on the surface. That is, in the above embodiment, the alloy coating 4 has a structure in which the interface reaction layer 6 is formed between the cooling pipe 3 and the alloy coating 4 is integrated with both the cooling pipe 3 and the outer cylinder 2. It is good also as a structure where the interface reaction layer 6 was provided in both between 4 and the cooling pipe 3, and between the alloy film 4 and the outer cylinder 2. FIG.

  FIG. 7 is a schematic enlarged cross-sectional view of an alloy film portion of another example of the burner according to the present embodiment. FIG. 8 is a partial enlarged cross-sectional view of the burner according to the present embodiment, and is a cross-sectional view in which a part of the outer cylinder 2 on the tip 2 a side is cut together with the cooling pipe 3 and the alloy film 4. The burner 10 shown in FIGS. 7 and 8 includes an interface reaction layer 6a and an interface reaction layer 6b. The interface reaction layer 6 a is formed between the alloy film 4 and the inner surface 3 a of the cooling pipe 3. In the burner 10, the alloy film 4 is joined to the inner surface 3 a of the winding of the cooling pipe 3 via the interface reaction layer 6 a. In the burner 10, the alloy film 4 is joined to the outer surface 2 b of the outer cylinder 2 via the interface reaction layer 6 b, and the cooling pipe 3 and the outer cylinder 2 are coupled. The position where the alloy film 4 is provided may include only the tip 2a of the outer cylinder 2 or a portion other than the tip 2a in the axial direction of the outer cylinder 2 as in the above embodiment. Further, it may be the entire circumference around the cooling pipe 3 or only the surface on the outer cylinder 2 side.

  In the burner 10 shown in FIGS. 7 and 8, the alloy film 4 is joined to both the cooling pipe 3 and the outer cylinder 2 via the interface reaction layers 6a and 6b. Thereby, since the cooling pipe 3 and the outer cylinder 2 are in surface contact through the alloy film 4, heat transfer between the outer cylinder 2 and the cooling pipe 3 can be performed more efficiently. It can be cooled effectively. As a result, durability can be improved by reducing the temperature of the tip 2a of the outer cylinder 2.

  FIG. 9 is a partially enlarged cross-sectional view of the burner according to the present embodiment, and is a cross-sectional view in which a part of the outer cylinder 2 on the tip 2 a side is cut together with the cooling pipe 3 and the alloy film 4. As shown in FIG. 9, the burner 10 may form a facing surface 3 aa facing the outer surface 2 b of the outer cylinder 2 on the inner surface 3 a of the winding of the cooling pipe 3. The facing surface 3aa is a surface parallel to the outer surface 2b of the outer cylinder 2 in the axial direction of the outer cylinder 2, that is, in a cross section along the axial direction. As shown in FIG. 9, the opposing surface 3aa can be formed by cutting or crushing so as to be a surface along the outer surface 2b of the outer cylinder 2 after winding, or by winding. It may be formed in advance when the previous cooling pipe 3 is formed. In the burner 10 shown in FIG. 9, since the cooling pipe 3 comes into surface contact with the outer cylinder 2 by the facing surface 3aa, the area directly contacted between the cooling pipe 3 and the outer cylinder 2 is improved, and the burner 10 is in a state where it can be easily contacted. Can do. Thereby, the adhesiveness and the cooling area can be improved, and more effective cooling is possible. Moreover, the alloy film 4 can be filled between the cooling pipe 3 and the cooling pipe 3 by forming the alloy film 4 at a position facing the outer cylinder 2 other than the facing surface 3aa of the cooling pipe 3. Heat can be easily transferred between the cooling pipe 3 and the outer cylinder 2. As a result, durability can be improved by reducing the temperature of the tip 2a of the outer cylinder 2.

  The wear damage of the cooling pipe 3 may be determined by the positional relationship between the tip 1a of the nozzle 1 and the tip 2a of the outer cylinder 2 or the positional relationship between the tip 2a of the outer cylinder 2 and the cooling pipe 3, but the installation Accuracy is difficult to achieve. Further, the wear of the cooling pipe 3 is caused by the thinning of the tip 2 a of the outer cylinder 2. For this reason, by integrating the outer cylinder 2 and the cooling pipe 3 with the alloy film 4, the positioning accuracy at the time of installation is improved, and the alloy film 4 is also provided at the tip 2 a of the outer cylinder 2, so that the outer cylinder 2 Since it contributes to the improvement of durability, it is possible to delay the time of occurrence of wear, leading to a longer life.

DESCRIPTION OF SYMBOLS 1 Nozzle 1a Tip 2 Outer cylinder 2a Tip 2b Outer surface 3 Cooling pipe 3a Inner surface 3aa Opposing surface 4 Alloy film 4a Inner surface 6 (6a, 6b) Interface reaction layer 10 Burner

Claims (7)

A burner nozzle,
An outer cylinder covering the outer surface of the burner nozzle by opening the tip side facing the furnace of the burner nozzle;
A cooling pipe wound around the outer cylinder;
A burner having at least an alloy film in which the outer cylinder is joined via an interface reaction layer on the inner circumferential surface of the winding of the cooling pipe disposed on the tip side of the burner nozzle.   The burner according to claim 1, wherein the interface reaction layer is a region in which a metal of a cooling pipe and a metal of the alloy film are mixed.   The burner according to claim 1 or 2, wherein the alloy film is provided on the entire surface of the cooling pipe.   The burner according to any one of claims 1 to 3, wherein the alloy film is provided by filling a gap between adjacent cooling pipes by winding.   The burner according to any one of claims 1 to 4, wherein the alloy film is in surface contact with an outer surface of the outer cylinder.   The alloy film is bonded to at least the inner surface of the winding of the cooling pipe via an interface reaction layer, and is bonded to the outer surface of the outer cylinder via an interface reaction layer. The burner as described in any one of Claim 1 to 4 which couple | bonds a pipe | tube.   The burner according to claim 6, wherein the cooling pipe is formed with an opposing surface facing the outer surface of the outer cylinder on the inner surface of the winding.

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