JP6723637B2 - Overheat reducer - Google Patents

Description

The present invention relates to a superheat reducer that reduces the degree of superheat of superheated steam in a boiler that generates steam.

In a thermal power plant, for example, a coal-fired boiler has a furnace that has a hollow shape and is installed in the vertical direction, and combustion burners are vertically arranged in multiple stages on the furnace wall. Further, the furnace has a flue provided at an upper part thereof, and the flue is provided with a superheater, a reheater, and a economizer for recovering heat of exhaust gas. Therefore, heat is exchanged between the exhaust gas generated by combustion in the furnace and the water flowing in the heat transfer tube, and steam can be generated. Power can be generated by supplying this steam to the steam turbine and driving it. Has become.

In such a boiler, the water supplied by the water supply pump is preheated by the economizer and then supplied to each heat transfer tube on the furnace wall, and is superheated in the heat transfer tube to become saturated steam. The saturated steam is introduced into the superheater and is overheated by the exhaust gas to become superheated steam, which is supplied to the steam turbine. Since this superheater needs to supply superheated steam at a predetermined temperature to the steam turbine, a superheat reducer (superheat reducer) that performs water injection on the superheated steam to adjust the temperature of the superheated steam is provided. As a conventional overheat reducer, for example, there is one described in Patent Document 1 below.

Japanese Patent No. 4058681

The conventional superheat reducer has a spray water pipe with a spray nozzle in the steam pipe, a protective pipe outside the spray water pipe, and an opening window for cooling fluid spray on the surface of the spray pipe. The water is sprayed toward the superheated steam, and a fluid (steam) having an intermediate temperature between the superheated steam and the spray water is caused to flow in the space between the spray water pipe and the protection pipe. This superheat reducer has a double pipe structure for supplying steam between the spray water pipe and the spray water pipe in order to prevent excessive thermal stress from being generated due to a temperature difference between the spray water and the superheated steam. However, most of the intermediate temperature steam supplied between the spray water pipe and the protection pipe is discharged from the periphery of the spray nozzle to the superheated steam side, but part of it flows to the tip side of the spray nozzle. It is cooled by the spray water pipe to become condensed water, and this condensed water flows down to the inner surface portion of the protection pipe. Then, the outer surface portion of the protective tube is heated by the superheated steam, while the inner surface portion is cooled by the condensed water, so that the thermal stress may be repeatedly applied to cause damage to the protective tube.

The present invention solves the above-mentioned problems, and an object of the present invention is to provide an overheat reducer that suppresses damage due to condensed water generated in the space between the spray water pipe and the protection pipe.

The superheat reducer of the present invention for achieving the above-mentioned object is a protection tube which is arranged in a flow path of superheated steam and is provided with a window portion, and a predetermined space portion is provided inside the protection tube to form an internal portion. Spray water for cooling and is supplied to the space portion with steam having a temperature lower than that of the superheated steam and higher than that of the spray water, and the spray water pipe provided inside the spray water pipe. And a spray nozzle for spraying toward the superheated steam from the window portion, and the spray water pipe is provided with a water supply passage of spray water up to the spray nozzle.

Therefore, when the spray water is supplied into the spray water pipe and the steam at the intermediate temperature is supplied to the space portion between the protection pipe and the spray water pipe, the spray water is sprayed from the spray nozzle to generate superheated steam. The temperature is reduced. At this time, since the water supply flow path of the spray water in the spray water pipe is provided only up to the spray nozzle, the intermediate temperature steam does not contact the spray water pipe cooled by the spray water at the tip end side of the protection pipe, It is possible to suppress generation of condensed water by cooling the intermediate temperature steam with the spray water. As a result, it is possible to suppress damage to the protection pipe due to condensed water.

In the overheat reducer of the present invention, the water supply passage is provided at least up to the injection hole of the spray nozzle.

Therefore, by providing the water supply passage up to the injection hole of the spray nozzle, the spray water can be reliably sprayed from the spray nozzle toward the superheated steam.

The overheat reducer of the present invention is characterized in that the water supply passage is provided with a partition member at a downstream end portion in the flow direction of the spray water.

Therefore, the partition member is provided at the downstream end of the spray water pipe in the flow direction of the spray water to form the water supply flow path, thereby shortening the water supply passage without drastically changing existing equipment. Generation of condensed water can be suppressed.

In the overheat reducer of the present invention, the protective pipe is supported by a wall portion forming a flow path of superheated steam on the base end side and the tip end side, and at least the tip end side of the spray water pipe is supported by the protection pipe. The partition member is provided adjacent to the spray nozzle.

Therefore, since the tip end side of the spray water pipe is supported by the protection pipe, the spray water pipe can be supported with sufficient strength. Further, by providing the partition member adjacent to the spray nozzle, it is possible to improve the mountability of the partition member and the spray nozzle.

In the overheat reducer of the present invention, the spray water pipe is a first spray water pipe located on the base end side and a second spray water pipe located on the tip end side and joined to the tip end side of the first spray water pipe. It is characterized in that the partition member is arranged at a joint position of the first spray water pipe and the second spray water pipe.

Therefore, by constructing the spray water pipe with the first spray water pipe and the second spray water pipe, and disposing the partition member at the joint position of the first spray water pipe and the second spray water pipe, the assembling property of the partition member with respect to the spray water pipe Can be improved.

In the overheat reducer of the present invention, the spray water pipe is a first spray water pipe located on the base end side and a second spray water pipe located on the tip end side and joined to the tip end side of the first spray water pipe. And the partition member is arranged in the first spray water pipe.

Therefore, the spray water pipe is composed of the first spray water pipe and the second spray water pipe, and the partition member is arranged in the first spray water pipe to supply the spray water to the joint portion of the first spray water pipe and the second spray water pipe. Since this is not done, thermal stress does not act repeatedly on this joint, and the durability of the spray water pipe can be improved.

In the overheat reducer of the present invention, the protection tube is supported by a wall portion forming a flow path of superheated steam on the base end side and the tip end side, and the spray water pipe has a tip end in the longitudinal direction of the protection tube. The spray nozzle is extended to an intermediate position, and the spray nozzle is arranged at a tip portion of the spray water pipe.

Therefore, by arranging the tip of the spray water pipe to the middle position in the longitudinal direction of the protection pipe and disposing the spray nozzle here, the length of the spray water pipe can be shortened and downsized, and the material cost can be reduced. be able to.

In the overheat reducer of the present invention, the spray water pipe is characterized in that the tip end side is supported by the protection pipe.

Therefore, by supporting the tip end side of the shortened spray water pipe on the protective pipe, the earthquake resistance of the spray water pipe can be improved.

In the overheat reducer of the present invention, the protection tube is supported by a wall portion that forms a flow path for superheated steam on the base end side and the tip end side, and the spray water pipe is from the tip end to the tip end side of the protection pipe. Is provided, and a tip portion of the support rod is supported by a tip portion of the protection tube.

Therefore, the support rod is extended from the tip end portion of the spray water pipe to the tip end side of the protection pipe, and the tip end portion of the support rod is supported by the protection pipe, so that the spray water pipe can be supported with sufficient strength.

According to the overheat reducer of the present invention, since the water supply passage for the spray water in the spray water pipe is provided up to the spray nozzle, damage to the protective pipe due to condensed water can be suppressed.

FIG. 1 is a vertical cross-sectional view showing the overheat reducer of the first embodiment. 2 is a sectional view taken along line II-II of FIG. FIG. 3 is a vertical cross-sectional view showing a first modification of the overheat reducer of the first embodiment. FIG. 4 is a vertical cross-sectional view showing a second modification of the overheat reducer of the first embodiment. FIG. 5 is a vertical cross-sectional view showing the overheat reducer of the second embodiment. FIG. 6 is a vertical cross-sectional view showing a first modification of the overheat reducer of the second embodiment. FIG. 7 is a vertical cross-sectional view showing a second modification of the overheat reducer of the second embodiment. FIG. 8 is a vertical cross-sectional view showing the overheat reducer of the third embodiment.

Hereinafter, preferred embodiments of an overheat reducer according to the present invention will be described in detail with reference to the accompanying drawings. It should be noted that the present invention is not limited to this embodiment, and when there are a plurality of embodiments, the present invention also includes those configured by combining the embodiments.

[First Embodiment]
FIG. 1 is a vertical cross-sectional view showing the overheat reducer of the first embodiment, and FIG. 2 is a II-II cross-sectional view of FIG.

In the first embodiment, as shown in FIGS. 1 and 2, the superheat reducer 10 is arranged in a flow passage 102 of a superheated steam pipe (main steam pipe) 101 that constitutes the superheater 100. The superheat reducer 10 is mounted so as to penetrate the superheated steam pipe 101 so as to intersect with the flow direction of the superheated steam S flowing in the superheated steam pipe 101, and reduces the temperature of the superheated steam S.

The overheat reducer 10 includes a protection pipe 11, a spray water pipe 12, and a spray nozzle 13.

The protection pipe 11 is a pipe having a cylindrical shape, and is arranged so as to penetrate the flow passage 102 so as to intersect with the flow passage 102 of the superheated steam pipe 101 through which the superheated steam S passes. The protection tube 11 is provided with a steam supply portion 21 at a base end portion, and is provided with a hemispherical portion 22 having a distal end portion closed, and the base end portion side is supported by a wall portion 103 of the superheated steam pipe 101, and a distal end portion thereof is supported. The side is supported by the wall portion 104 of the superheated steam pipe 101. The superheated steam pipe 101 is provided with a cover portion 105 that covers the tip portion (hemispherical portion 22) of the protection pipe 11. Further, the protective tube 11 is provided with an elliptical window portion 23 opened at an intermediate portion in the longitudinal direction.

The spray water pipe 12 is a pipe having a cylindrical shape with a diameter smaller than that of the protection pipe 11. Like the protection pipe 11, the spray water pipe 12 is provided inside the protection pipe 11 so as to intersect with the flow path 102 of the superheated steam pipe 101 through which the superheated steam S passes. It is located in. The spray water pipe 12 is provided with a spray water supply unit 31 at the base end, and is provided with a hemispherical portion 32 having a closed distal end. The base end side is supported by the protective pipe 11, and the tip end side is provided with a support member 33. Is supported by the inner surface of the protective tube 11. The spray water supply unit 31 is capable of supplying the spray water W, which is injected into the flow path 102 of the superheated steam pipe 101 to cool the superheated steam S. The spray water W is water having a higher pressure than the superheated steam S flowing in the flow path 102 of the superheated steam pipe 101. The support member 33 is composed of a plurality of members that are interrupted in the circumferential direction between the inner surface portion of the protection pipe 11 and the outer surface portion of the spray water pipe 12, but may have a ring shape continuous in the circumferential direction. ..

Since the protective pipe 11 and the spray water pipe 12 form a double pipe structure, the vapor space portion 34 is provided between the protective pipe 11 and the spray water pipe 12. The steam space 34 has a proximal end communicating with the above-described steam supply unit 21, and a distal end closed by the hemispheres 22 and 32. In the steam space 34, a certain amount of clearance is secured by the protection pipe 11 and the spray water pipe 12. The steam space portion 34 can supply warming steam WS, which is steam at an intermediate temperature. The warming steam WS has a temperature lower than that of the superheated steam S and higher than that of the spray water W.

The spray nozzle 13 is provided in the spray water pipe 12 at a central position in the longitudinal direction of the spray water pipe 12. The spray nozzle 13 is formed with an injection hole 41 that communicates with the inside and outside of the spray water pipe 12, and the injection hole 41 extends in a direction orthogonal to the longitudinal direction of the spray water pipe 12, that is, along the radial direction of the spray water pipe 12. Has been formed. The spray nozzle 13 is provided with the injection hole 41 toward the downstream side in the flow direction of the superheated steam S in the flow path 102 of the superheated steam pipe 101. Therefore, the spray nozzle 13 can spray the spray water W supplied inside the spray water pipe 12 from the injection hole 41 to the flow path 102. In this case, the spray nozzle 13 sprays the spray water W toward the downstream side in the flow direction of the superheated steam S.

Further, the spray nozzle 13 is arranged at a position corresponding to the window portion 23 provided in the protection pipe 11, and the injection hole 41 is exposed to the flow path 102 of the superheated steam pipe 101 through the window portion 23. Further, a gap is secured between the spray nozzle 13 and the window portion 23 of the protective tube 11. Therefore, when the spray water W is sprayed from the spray hole 41 of the spray nozzle 13 toward the superheated steam S flowing through the flow path 102 of the superheated steam pipe 101, the warming steam WS in the steam space portion 34 is also sprayed. The superheated steam S flowing through the flow path 102 of the superheated steam pipe 100 is discharged from the gap between the nozzle 13 and the window portion 23.

In the present embodiment, the spray water pipe 12 is provided with a water supply passage 51 for the spray water W up to the spray nozzle 13. In this case, the water supply flow path 51 may be provided at least up to the injection hole 41 of the spray nozzle 13.

In the spray water pipe 12, the partition member 52 is arranged in the middle part in the longitudinal direction from the middle part in the longitudinal direction, so that the interior has a water supply flow path 51 on the proximal end side and a hollow part 53 on the distal end side. It is divided into The spray nozzle 13 is arranged near the tip of the water supply channel 51, that is, in the vicinity of the partition member 52, so that the outer surface thereof contacts the flat surface portion of the partition member 52. The outer surface of the spray nozzle 13 may be separated without contacting the flat surface portion of the partition member 52. Therefore, the water supply passage 51 is formed in the spray water pipe 12 from the base end portion to the middle portion.

In this case, the spray water pipe 12 is composed of a first spray water pipe 54 located on the base end side and a second spray water pipe 55 located on the tip end side and joined to the tip end side of the first spray water pipe 54. Has been done. The first spray water pipe 54 is provided with the spray water supply unit 31 at the base end and has an open front end. The second spray water pipe 55 is open at the base end and is provided with the hemisphere 32 at the tip. The first spray water pipe 54 and the second spray water pipe 55 have their openings joined together via a partition member 52. Here, the partition member 52 has a disk shape with a constant plate thickness, the outer diameter is the same as the outer diameter of the first spray water pipe 54 and the second spray water pipe 55, and the opening portion of the first spray water pipe 54. And the partition member 52 are joined by a welded portion B1, and the partition member 52 and the opening of the second spray water pipe 55 are joined by a welded portion B2.

The base end side and the tip end side of the protective pipe 11 are supported by the walls 103 and 104, and the second spray water pipe 55 of the spray water pipe 12 is supported by the protective pipe 11 by the support member 33 on the front end side. ..

In the above description, the spray water pipe 12 is composed of the first spray water pipe 54 and the second spray water pipe 55, and the partition member 52 is arranged between the first spray water pipe 54 and the second spray water pipe 55. It is not limited to the configuration. FIG. 3 is a vertical cross-sectional view showing a first modification of the overheat reducer of the first embodiment, and FIG. 4 is a vertical cross-sectional view showing a second modification of the overheat reducer of the first embodiment.

In the first modified example, as shown in FIG. 3, the spray water pipe 12 is composed of a first spray water pipe 54 and a second spray water pipe 55, and the first spray water pipe 54 and the second spray water pipe 55 have openings. Are joined via a partition member 56. The partition member 56 has the same outer diameter as the first spray water pipe 54 and the second spray water pipe 55, and the outer peripheral portion is rounded or rounded. Then, the opening of the first spray water pipe 54 and the partition member 56 are joined by the welded portion B3, and the opening of the partition member 56 and the second spray water pipe 55 are joined by the welded portion B4. Therefore, even if the warming steam WS acts from the outside of the spray water pipe 12 to which the spray water is supplied, it acts on the welding portions B3, B4 of the first spray water pipe 54, the partition member 56, and the second spray water pipe 55. Thermal stress is reduced.

Further, in the second modification, as shown in FIG. 4, the spray water pipe 12 includes a first spray water pipe 54 and a second spray water pipe 55, and the first spray water pipe 54 and the second spray water pipe 55 have openings. The parts are directly joined by the welded part B5. The partition member 52 is arranged inside the first spray water pipe 54. Therefore, the spray water W does not come into contact with the welded portion B5 between the first spray water pipe 54 and the second spray water pipe 55, and the thermal stress that acts is reduced.

In the overheat reducer 10 of the first embodiment described above, the spray water W is supplied into the spray water pipe 12, and the warming steam WS is supplied to the steam space portion 34 between the protection pipe 11 and the spray water pipe 12. To be done. Then, the spray water W is sprayed from the spray nozzle 13 to reduce the temperature of the superheated steam S, and at the same time, the warming steam WS is discharged from the gap between the spray nozzle 13 and the window portion 23, whereby the spray water pipe 12 It is possible to prevent excessive thermal stress from being generated.

At this time, the warming steam WS is supplied from the steam supply section 21 to the steam space section 34 and discharged from the gap between the spray nozzle 13 and the window section 23. The Muming vapor WS is likely to stay without being discharged from the gap between the spray nozzle 13 and the window 23. However, since the water supply flow path 51 of the spray water W in the spray water pipe 12 is provided only up to the spray nozzle 13, the warming steam WS staying in the steam space 34 on the tip end side of the protection pipe 11 is the spray water pipe. It does not come into contact with the spray water W in 12. Therefore, the warming steam WS is not cooled by the spray water W, and the generation of condensed water due to the cooling of the warming steam WS is suppressed.

As described above, in the overheat reducer of the first embodiment, the protective tube 11 disposed in the flow path 102 of the overheated steam S and provided with the window portion 23, and the predetermined vapor space portion 34 in the protective tube 11. And the spray water pipe 12 to which the spray water W for cooling is supplied inside and the warm space steam WS is supplied to the steam space 34, and the spray water W provided inside the spray water pipe 12 and the spray water W inside. A spray nozzle 13 for spraying from the window portion 23 toward the superheated steam S is provided, and a water supply passage 51 of the spray water W is provided up to the spray nozzle 13 in the spray water pipe 12.

Therefore, the warming steam WS does not come into contact with the spray water W in the spray water pipe 12 on the tip end side of the protection pipe 11, and the warming steam WS is suppressed from being cooled by the spray water W to generate condensed water. .. As a result, damage to the protection pipe 11 due to condensed water can be suppressed.

In the overheat reducer of the first embodiment, the water supply flow path 51 is provided up to at least the injection hole 41 of the spray nozzle 13. Therefore, the spray water W can be reliably sprayed from the spray nozzle 13 toward the superheated steam S.

In the overheat reducer of the first embodiment, the water supply flow path 51 is provided with partition members 52 and 56 at the downstream end in the flow direction of the spray water W. Therefore, the partition members 52 and 56 are provided at the downstream end portion of the spray water pipe 12 in the flow direction of the spray water W to form the water supply flow path 51, so that the existing equipment is not significantly changed, and The supply passage 51 can be easily shortened to suppress the generation of condensed water.

In the overheat reducer of the first embodiment, the base end side and the tip end side of the protection pipe 11 are supported by the wall parts 102 and 104 forming the flow path 101 of the superheated steam S, and the tip end side of the spray water pipe 12 is fixed. Partition members 52 and 56 are provided adjacent to the spray nozzle 13 while being supported by the protective tube 11. Therefore, since the tip end side of the spray water pipe 12 is supported by the protection pipe 11, the spray water pipe 12 can be supported with sufficient strength. In addition, by providing the partition member 52 almost adjacent to the spray nozzle 13, the mountability of the partition member 52 and the spray nozzle 13 can be improved.

In the overheat reducer of the first embodiment, the spray water pipe 12 is joined to the first spray water pipe 54 located on the base end side and to the tip end side of the first spray water pipe 54 located on the tip end side. It is composed of two spray water pipes 55, and the partition member 52 is arranged at the joint position of the first spray water pipe 54 and the second spray water pipe 55. Therefore, the 1st spray water pipe 54, the 2nd spray water pipe 55, and the partition member 52 can be easily joined, and the assembly property of the partition member 52 with respect to the spray water pipe 12 can be improved.

In the overheat reducer of the first embodiment, the spray water pipe 12 is joined to the first spray water pipe 54 located on the base end side and to the tip end side of the first spray water pipe 54 located on the tip end side. The second spray water pipe 55 and the partition member 52 are arranged in the first spray water pipe 54. Therefore, since the spray water W is not supplied to the joint B5 of the first spray water pipe 54 and the second spray water pipe 55, thermal stress does not repeatedly act on this joint, and the durability of the spray water pipe 12 is improved. be able to.

Further, in the superheater of the first embodiment, the superheat reducer 10 is arranged so as to intersect the flow of the superheated steam S flowing through the superheated steam pipe 101. Therefore, in the superheat reducer 10, the spray water W is sprayed from the spray nozzle 13 to reduce the temperature of the superheated steam S, and at the same time, the warming steam WS is discharged from the window portion 23, so that the spray water pipe 12 It is possible to prevent excessive thermal stress from being generated. At this time, since the water supply flow path 51 of the spray water W in the spray water pipe 12 is provided only up to the spray nozzle 13, the warming steam WS on the tip end side of the protection pipe 11 is the spray water W in the spray water pipe 12. It is suppressed that the warming steam WS is cooled by the spray water W and the condensed water is not generated. As a result, damage to the protective pipe 11 due to condensed water can be suppressed, and the durability of the superheater 100 can be improved.

[Second Embodiment]
FIG. 5 is a vertical cross-sectional view showing the overheat reducer of the second embodiment. The members having the same functions as those in the first embodiment described above are designated by the same reference numerals, and detailed description thereof will be omitted.

In the second embodiment, as shown in FIG. 5, the overheat reducer 60 includes a protection pipe 11, a spray water pipe 61, and a spray nozzle 13.

The protection tube 11 is provided with a steam supply portion 21 at a base end portion, and is provided with a hemispherical portion 22 having a distal end portion closed, and the base end portion side is supported by a wall portion 103 of the superheated steam pipe 101, and a distal end portion thereof is supported. The side is supported by the wall portion 104 of the superheated steam pipe 101, and the window portion 23 is provided so as to open in the middle portion in the longitudinal direction.

The spray water pipe 61 is a pipe having a cylindrical shape with a diameter smaller than that of the protection pipe 11. Like the protection pipe 11, the spray water pipe 61 is arranged inside the protection pipe 11 so as to intersect with the flow path 102 of the superheated steam pipe 101 through which the superheated steam S passes. It is located in. The spray water pipe 61 is provided with a spray water supply unit 62 at its base end, and the tip end thereof is extended to an intermediate position in the longitudinal direction of the protection pipe 11, and is supported by the inner surface of the protection pipe 11 by a support member 33. There is. And the partition member 63 is being fixed to the front-end|tip part of the spray water pipe 61 in a longitudinal direction.

Since the protective pipe 11 and the spray water pipe 61 form a double pipe structure, the vapor space 64 is provided between the protective pipe 11 and the spray water pipe 61. The steam space 64 has a proximal end communicating with the above-described steam supply unit 21, and a distal end closed by the hemisphere 22. The vapor space portion 64 has a fixed gap amount on the base end side by the protective pipe 11 and the spray water pipe 12, and has a predetermined size space on the tip end side. The warming steam WS can be supplied to the steam space portion 64. The spray nozzle 13 is provided at the tip of the spray water pipe 61.

In the present embodiment, the spray water pipe 61 is provided with a water supply passage 65 for the spray water W up to the spray nozzle 13. A partition member 63 is arranged at the tip of the spray water pipe 61 so that a water supply passage 65 is defined inside. The spray nozzle 13 is arranged near the tip of the water supply passage 65, that is, in the vicinity of the partition member 63, so that the outer surface of the spray nozzle 13 substantially contacts the flat surface of the partition member 63. In this case, the partition member 63 has a disk shape with a constant plate thickness, the outer diameter is the same as the outer diameter of the spray water pipe 61, and is joined to the tip end portion of the spray water pipe 61 by the welded portion B6.

In the above description, the disc-shaped partition member 63 is fixed to the tip of the spray water pipe 61, but the configuration is not limited to this. FIG. 6 is a vertical cross-sectional view showing a first modification of the overheat reducer of the second embodiment, and FIG. 7 is a vertical cross-sectional view showing a second modification of the overheat reducer of the second embodiment.

In the first modified embodiment, as shown in FIG. 6, the spray water pipe 61 is composed of a first spray water pipe 71 and a second spray water pipe 72, and the second spray water pipe 72 has a partition member 73 integrated at its tip. It is provided. That is, the opening of the first spray water pipe 71 and the opening of the second spray water pipe 72 are joined together by the welded portion B7. Therefore, the first spray water pipe 71 and the second spray water pipe 72 having the partition member 73 can be easily formed, and the stress is structurally reduced.

Further, in the second modified embodiment, as shown in FIG. 7, the spray water pipe 61 has a partition member 75 joined to the tip portion thereof by a welded portion B6. The partition member 75 has a disk shape, an outer diameter that is the same as the outer diameter of the spray water pipe 61, and inner and outer surfaces that are hemispherical. Therefore, the thermal stress acting on the welded portion B6 between the tip end portion of the spray water pipe 61 and the outer peripheral portion of the partition member 75 and the partition member 75 is reduced.

In the overheat reducer 60 of the second embodiment described above, the spray water W is supplied into the spray water pipe 61, and the warming steam WS is supplied to the steam space portion 64 between the protection pipe 11 and the spray water pipe 61. As a result, excessive thermal stress is prevented from being generated in the spray water pipe 12.

At this time, the warming steam WS is supplied from the steam supply section 21 to the steam space section 64 and discharged from the gap between the spray nozzle 13 and the window section 23. The Muming steam WS is not discharged from the gap between the spray nozzle 13 and the window portion 23, but tends to stay in a large space. However, since the spray water pipe 61, that is, the water supply flow path 65 of the spray water W is provided only up to the spray nozzle 13, the warming steam WS staying in the steam space 64 on the tip end side of the protection pipe 11 is generated. It does not come into contact with the spray water W in the spray water pipe 61. Therefore, the warming steam WS is not cooled by the spray water W, and the generation of condensed water due to the cooling of the warming steam WS is suppressed.

As described above, in the overheat reducer of the second embodiment, the protective pipe 11 disposed in the flow path 102 of the superheated steam S and provided with the window portion 23, and the predetermined vapor space 64 in the protective pipe 11. And a spray water pipe 61 to which the spray water W for cooling is supplied and the warm space steam WS is supplied to the steam space 64 and the spray water W provided inside the spray water pipe 61. A spray nozzle 13 for spraying from the window 23 toward the superheated steam S is provided, and a water supply passage 65 of the spray water W is provided up to the spray nozzle 13 in the spray water pipe 61.

Therefore, the warming steam WS does not come into contact with the spray water W in the spray water pipe 61 on the tip end side of the protective pipe 11, and the warming steam WS is suppressed from being cooled by the spray water W to generate condensed water. .. As a result, damage to the protection pipe 11 due to condensed water can be suppressed.

In the overheat reducer of the second embodiment, the protection tube 11 is supported by the walls 103 and 104 forming the flow path 102 of the superheated steam S on the base end side and the tip end side, and the tip end of the spray water pipe 61 is protected by the protection tube. The spray nozzle 13 extends to an intermediate position in the longitudinal direction of 11 and the spray nozzle 13 is arranged at the tip of the spray water pipe 61. Therefore, the length of the spray water pipe 61 can be shortened to reduce the size, and the material cost can be reduced.

Further, in the overheat reducer of the second embodiment, the tip end side of the spray water pipe 61 is supported by the protection pipe 11. Therefore, by supporting the tip end side of the shortened spray water pipe 61 on the protective pipe 11, it is possible to improve the earthquake resistance of the spray water pipe 61.

[Third Embodiment]
FIG. 8 is a vertical cross-sectional view showing the overheat reducer of the third embodiment. It should be noted that members having the same functions as those in the above-described respective embodiments are designated by the same reference numerals and detailed description thereof will be omitted.

In the third embodiment, as shown in FIG. 8, the overheat reducer 60 includes a protection pipe 11, a spray water pipe 61, and a spray nozzle 13.

The protection tube 11 is provided with a steam supply portion 21 at a base end portion, and is provided with a hemispherical portion 22 having a distal end portion closed, and the base end portion side is supported by a wall portion 103 of the superheated steam pipe 101, and a distal end portion thereof is supported. The side is supported by the wall portion 104 of the superheated steam pipe 101, and the window portion 23 is provided so as to open in the middle portion in the longitudinal direction.

The spray water pipe 61 is provided with a spray water supply part 62 at the base end, and the tip end is extended to an intermediate position in the longitudinal direction of the protection pipe 11, and is supported by the inner surface of the protection pipe 11 by a support member 83. There is. Then, the spray water pipe 61 has a partition member 63 fixed to the distal end portion in the longitudinal direction, thereby defining a water supply flow path 65 inside. The spray nozzle 13 is arranged near the tip of the water supply passage 65, that is, in the vicinity of the partition member 63, so that the outer surface of the spray nozzle 13 substantially contacts the flat surface of the partition member 63.

Further, in the spray water pipe 61, a support rod 81 extending from the tip to the tip of the protection pipe 11 is fixed, a support disk 82 is fixed to the tip of the support rod 81, and the support disk 82 is a support member 83. It is supported on the tip end side of the protective tube 11 via. Therefore, in the spray water pipe 61, the base end portion and the tip end portion are supported by the protection pipe 11.

As described above, in the overheat reducer of the third embodiment, the protection pipe 11 is supported by the wall portions 103 and 104 that form the flow path 102 of the superheated steam S on the base end side and the tip end side, and the spray water pipe. A support rod 81 extending from the tip to the tip of the protection tube 11 is provided at 61, and a support disk 82 at the tip of the support rod 81 is supported on the tip of the protection tube 11 via a support member 83. Has been done.

Therefore, since the tip end portion of the support rod 81 extending from the tip end portion of the spray water pipe 61 is supported on the tip end side of the protection pipe 11, the spray water pipe 61 can be supported with sufficient strength.

Although one spray nozzle 13 is arranged in the spray water pipes 12 and 61 in the above-described embodiment, a plurality of spray nozzles 13 may be arranged at a predetermined interval. In this case, the water supply passages 51 and 65 may be provided up to the spray nozzle on the most downstream side in the flow direction of the spray water.

Further, in the above-described embodiment, the spray nozzle 13 having the injection hole 41 is attached to the spray water pipes 12, 61, but the injection hole 41 may be directly formed in the spray water pipes 12, 61. In this case, the spray nozzle and the spray water pipe are integrally provided.

Further, although the overheat reducers 10 and 60 are applied to the superheater 100 in the above-described embodiment, they may be reheaters.

10,60 Superheat reducer 11 Protection pipe 12,61 Spray water pipe 13 Spray nozzle 23 Window 33,83 Support member 34,64 Steam space 41 Injection hole 51,65 Water supply flow path 52,56,63,73,75 Partition member 53 Hollow part 54,71 First spray water pipe 55,72 Second spray water pipe 81 Support rod 82 Support disk 100 Superheater 102 Flow path 103, 104 Wall part S Superheated steam W Spray water WS Warming steam B1, B2 B3, B4, B5, B6, B7 Welded part

Claims (4)

A protective tube provided with a window portion arranged in the flow path of the superheated steam,
A spray water pipe which is arranged with a predetermined space in the protection pipe and is supplied with cooling spray water inside and is supplied with steam having a temperature lower than that of superheated steam and a temperature higher than that of the spray water to the space. When,
A spray nozzle that is provided in the spray water pipe and sprays the internal spray water toward the superheated steam from the window portion,
Equipped with
The water spray pipe, provided we are water supply passage of the spray water to the spray nozzle,
The water supply channel, a partition member is provided at the downstream end of the flow direction of the spray water,
The protection tube is supported by a wall portion forming a flow path for superheated steam on the base end side and the tip end side, and the spray water pipe is supported on the protection tube at least on the tip end side,
The spray water pipe includes a first spray water pipe located on the base end side and a second spray water pipe located on the tip end side and joined to the tip end side of the first spray water pipe. Is disposed adjacent to the spray nozzle at a joint position between the first spray water pipe and the second spray water pipe,
An overheat reducer characterized by the above. A protective tube provided with a window portion arranged in the flow path of the superheated steam,
A spray water pipe which is arranged with a predetermined space in the protection pipe and is supplied with cooling spray water inside and is supplied with steam having a temperature lower than that of superheated steam and a temperature higher than that of the spray water to the space. When,
A spray nozzle that is provided in the spray water pipe and sprays the internal spray water toward the superheated steam from the window portion,
Equipped with
The water spray pipe, provided we are water supply passage of the spray water to the spray nozzle,
The water supply channel, a partition member is provided at the downstream end of the flow direction of the spray water,
The protection tube is supported by a wall portion forming a flow path for superheated steam on the base end side and the tip end side, and the spray water pipe is supported on the protection tube at least on the tip end side,
The spray water pipe includes a first spray water pipe located on the base end side and a second spray water pipe located on the tip end side and joined to the tip end side of the first spray water pipe. Is disposed in the first spray water tube adjacent to the spray nozzle,
An overheat reducer characterized by the above. A protective tube provided with a window portion arranged in the flow path of the superheated steam,
A spray water pipe which is arranged with a predetermined space in the protection pipe and is supplied with cooling spray water inside and is supplied with steam having a temperature lower than that of superheated steam and a temperature higher than that of the spray water to the space. When,
A spray nozzle that is provided in the spray water pipe and sprays the internal spray water toward the superheated steam from the window portion,
Equipped with
The water spray pipe, provided we are water supply passage of the spray water to the spray nozzle,
The protective tube is supported by a wall portion that forms a flow path for superheated steam on the base end side and the tip end side, and the spray water pipe has a tip end extended to an intermediate position in the longitudinal direction of the protection tube, A spray nozzle is arranged at the tip of the spray water pipe,
The spray water pipe is provided with a support rod extending from the tip to the tip of the protection pipe, and the tip of the support rod is supported by the tip of the protection pipe.
An overheat reducer characterized by the above. The superheat reducer according to any one of claims 1 to 3, wherein the water supply passage is provided at least up to the injection hole of the spray nozzle.

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