JP2008194633A - Moisture separator and method for producing corrugated sheet of the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the collection efficiency of droplets contained in dampening vapor by improving the collecting capability and save the production cost by simplifying the production process of a corrugated sheet in a moisture separation apparatus to be employed for an electric power generation plant. <P>SOLUTION: The moisture separation apparatus comprises a plurality of corrugated sheets arranged at prescribed intervals from one another and collects droplets in dampened steam by passing the dampened steam to the channel formed between the corrugated sheets. The corrugated sheets 83 have a zigzag cross-section consisting of reciprocally formed hills and valleys and are equipped with droplet trap pockets 84 which have flat parts in the summit parts 86 of the corrugated sheets and are opened toward the dampened steam current S1 flowing along the surfaces of the corrugated sheets covering the flat parts are formed wherein the width c and the depth b of the inner spaces of the droplet collecting pockets 84 are made wider than the width a of the inlet aperture of the droplet collecting pockets 84. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a moisture separation device or a moisture separation heating device applied to a power plant such as a nuclear power plant, for example, in particular, separating moisture from wet steam supplied from a steam generator or a steam turbine, The present invention relates to a moisture separator for supplying to a turbine side, and a corrugated plate manufacturing method provided in the moisture separator.

  Conventionally, moisture separators used in power plants such as nuclear power plants generally remove moisture by removing droplets from wet steam supplied from a steam generator or discharged from a steam turbine. It is used to separate and supply dry steam to the turbine side. This increases the rotational efficiency of the turbine and improves the power generation efficiency.

  A conventional moisture separation (heating) device will be described with reference to FIGS. FIG. 5 is a vertical sectional elevational view of a conventional moisture separator, FIG. 6 is a transverse side view taken along line AA in FIG. 5, and FIG. 7 is a moisture separator provided in the moisture separator ( It is a perspective view which shows a corrugated sheet installation part.

  5 and 6, the moisture separator 01 includes left and right end plates 03 and 04 and a central cylindrical body plate 02. Partition plates 05 and 06 are provided between the trunk plate 02 and the end plates 03 and 04. Two steam pipes 07 are arranged in the longitudinal direction in the center of the trunk plate 02, and a moisture separating part 08 in which a number of corrugated plates 083 are arranged in parallel at intervals in the longitudinal direction is arranged therebelow. ing. As shown in FIG. 7, the corrugated plate 083 has a zigzag shape in which peaks and valleys are alternately formed, and droplets are collected by passing the wet steam S1 through a zigzag-shaped channel formed between the corrugated plates. The collected droplets flow down along the surface of the corrugated plate 083 and are discharged from the drain outlet pipe 09 to the outside.

  As shown in FIG. 5, a steam chamber end plate 010 is provided on the end plate 04, and an inlet pipe 011 to which the high temperature steam h is supplied to the steam chamber end plate 010 and an outlet from which the high temperature steam h after heat exchange is discharged. A partition plate 013 for separating the pipe 012 from the inlet side and the outlet side is provided. A heating tube group 015 composed of a number of heating tubes is provided in the longitudinal direction above the moisture separator 01. The heating tube group 015 is supported by a tube plate 014 and a partition plate 015.

  The high-temperature steam h is supplied to the inlet pipe 011 from a steam generator (not shown) that is a supply source. The high-temperature steam h flows through the heating tube group 015 through the end plate 010, returns to the end plate 010 through the folded portion 015a, and is then discharged to the outside from the outlet tube 012. The end plate 03 is provided with a steam inlet pipe 016 for the wet steam S1, and the upper part of the body plate 02 is provided with a steam outlet pipe 017 for discharging the dry steam S2 from which droplets have been removed.

  In such a configuration, the wet steam S <b> 1 containing droplets is supplied from the steam inlet pipe 016 and flows into the two steam pipes 07. The wet steam S1 that has flowed into the steam pipe 07 flows out of the steam pipe 07 through a slit 07a provided on the lower circumferential surface of the steam pipe 07, and then a moisture separation in which a number of corrugated plates 083 are arranged in parallel. Part 08 is entered.

  Next, the configuration of the moisture separator 08 will be described with reference to FIG. In FIG. 7, in the moisture separator 08, a large number of corrugated plates 083 are mounted between the upper frame 081 and the lower frame 082. The corrugated plate 083 is formed with a valley and a droplet collecting plate 084 is attached to each peak. Then, the wet steam S1 flows into the moisture separator 08 from the direction of the arrow, and droplets contained in the wet steam S1 adhere to the surface of the corrugated plate 083. Then, the droplet flowing in the flow direction of the wet steam S1 along the surface of the corrugated plate 083 is received by the droplet collecting plate 084 and stays inside the droplet collecting plate 084.

Then, it flows downward along the corrugated plate surface and then flows down into a groove 085 provided below. Further, the droplet flying on the flow of the wet steam S1 also collides with the corrugated plate 083 and is collected by the droplet collecting plate 084 by the same action and separated from the wet steam S1.
The wet steam S1 from which the droplets have been removed by the moisture separator 08 rises and passes between the heating tube groups 015. At this time, it is heated by the high-temperature steam h flowing through the heating tube group 015. The heated steam becomes dry steam S2 and is discharged from the steam outlet pipe 017 to the outside of the moisture separator 01 and sent to the turbine side.

  FIG. 10 of Patent Document 1 (Japanese Patent Laid-Open No. 6-222190) discloses a configuration of a corrugated plate used for a moisture separator. The configuration of this corrugated plate is shown in FIG. In FIG. 8, a plurality of substantially L-shaped droplet separation plates 093a, 093b, 093c, and 093d projecting into the collection channel 092 are connected to the corrugated plate 091, and drain pockets 094a for collecting droplets, respectively. 094b, 094c, and 094d are formed. Further, the outlet side end portion of the corrugated plate 091 is folded to be provided with a droplet separating plate 093e, and a drain pocket 094e is formed.

  FIG. 13 of Patent Document 2 (Japanese Patent Laid-Open No. 2002-311179) discloses a configuration of a corrugated sheet manufactured by bending one thin sheet. The structure of this corrugated sheet will be described with reference to FIG. In FIG. 9, wet steam S <b> 1 containing droplets is supplied from a flow path inlet 0103 to a zigzag flow path 0102 constituted by corrugated plates 0101, and the wet steam S <b> 1 flows along the flow path 0102. A pocket 0104 is provided in the flow path 0102. Of the wet steam S1 flowing along the flow path 0102, a droplet having a high specific gravity collides with the wall surface of the corrugated plate 0101 and becomes a liquid film and adheres to the wall surface.

  The liquid film adhering to the wall surface moves in the flow direction of the wet steam S1, but is returned by the curved surface of the pocket 0104 and collected in the pocket 0104. The liquid film collected in the pocket 0104 falls by its own weight and is discharged to the outside through a drain pipe (not shown).

JP-A-6-222190 (paragraph [0086] on page 14 and FIG. 10) JP 2002-31179 A (paragraphs [0006] to [0013] and FIG. 13 on page 3)

  The corrugated plate 091 disclosed in Patent Document 1 has no flat surface at the bent portions 091a, 091b, 091c, and 091d. The space cannot be made large. Moreover, the depth of the wet steam flow direction cannot be made long. Accordingly, the amount of collected droplets is small, and the drain pocket is filled with droplets immediately, so that a large amount of collected droplets cannot be obtained. In addition, since the width of the internal space of the drain pocket cannot be made large, the droplet cannot easily be removed from the wet steam because the droplet easily exits even if the droplet once enters the drain pocket. There is.

Further, since the droplet separation plates 093a, 093b, 093c, 093d, and 093e are attached to the corrugated plate 091 one by one by a method such as welding, the number of mounting steps is enormous. Thousands of corrugated plates are arranged in one moisture separator, and it is necessary to attach a plurality of droplet separating plates to one corrugated plate. When spot welding is performed, the number of welding points required for one moisture separator becomes enormous.
In addition, since the number of welding steps is enormous, forgetting to weld and poor welding are likely to occur, and there is a possibility that the liquid droplet separation plate may fall off.

  Further, the corrugated plate disclosed in Patent Document 2 has a small volume of the pocket 0104 and cannot capture a large amount of droplets. Further, since the entrance opening width of the pocket 0104 is the same as the width of the internal space of the pocket 0104, as described in Patent Document 2, some of the droplets collected in the pocket 0104 are likely to re-scatter. Accordingly, the liquid droplets once collected in the pocket 0104 are re-scattered and returned to the flow path 0102, and recombined with the wet steam S1, so that the liquid droplet collection efficiency by the pocket 0104 is reduced, and thus the moisture content is reduced. There is a problem that the separation efficiency also decreases.

  In view of the problems of the prior art, the present invention improves the collection efficiency by improving the collection ability of droplets contained in wet steam in a moisture separator applied to a power plant. The purpose is to simplify the manufacturing process and reduce the manufacturing cost.

In order to achieve this object, the moisture separator of the present invention comprises:
A moisture separator comprising a plurality of corrugated plates disposed at a predetermined interval from each other, and flowing wet steam through a flow path formed between the corrugated plates to collect droplets in the wet steam In
The corrugated plate has a zigzag cross section alternately forming a mountain valley,
Provided with a flat portion at the top of the corrugated plate, provided with a droplet collection pocket that covers the flat portion and opens toward the wet steam flow flowing along the corrugated surface,
The width and depth of the internal space of the droplet collection pocket are formed larger than the inlet opening width of the droplet collection pocket.

  In the present invention, when wet steam hits the surface of the zigzag-shaped portion of the corrugated plate, droplets containing the wet steam adhere to the surface of the zigzag-shaped portion. The droplets adhering to the surface are pushed by the wet steam flow, move on the surface, and reach the top of the zigzag shaped portion. Since the top of the mountain is provided with a droplet collection pocket having an inlet opening toward the wet steam flow, the droplet can smoothly enter the droplet collection pocket from the inlet opening. On the other hand, since the wet steam flow is detoured so as to pass outside the droplet collection pocket, only the droplet can be collected with high accuracy.

  In the present invention, a flat portion is provided at the top of the corrugated plate, and the droplet collection pocket is provided so as to cover the flat portion, thereby increasing the volume of the internal space of the droplet collection pocket. It becomes easy. For this reason, the width and depth of the internal space of the droplet collection pocket can be formed larger than the inlet opening width of the droplet collection pocket. This makes it possible to increase the internal volume of the droplet collection pocket, thereby increasing the moisture collection capability of the corrugated plate. Moreover, it is possible to prevent the droplets once collected in the droplet collection pocket from being re-scattered from the entrance opening.

  In the apparatus of the present invention, it is preferable that the corrugated plate is formed by bending one thin plate including the droplet collection pocket. By doing so, the step of joining the droplet collection pockets can be eliminated, so that the corrugated plate manufacturing process can be greatly simplified.

  In addition, the corrugated plate is attached to the moisture separating portion by inserting both end portions of the corrugated plate into concave grooves formed on the support frame surface of the moisture separating device main body and fixing the corrugated plate. In this case, since the both ends of the corrugated plate have the same shape, the corrugated plate is mistakenly fixed upside down, and the inlet opening of the droplet collection pocket tends to face the downstream side of the wet steam. Therefore, it is necessary to attach the corrugated plate while taking care not to cause this. As described above, since there are thousands of corrugated plates in one moisture separator, it is extremely laborious for workers to insert corrugated plates carefully one by one.

  For this reason, in the device of the present invention, preferably, both end portions of the corrugated plate that are inserted into the concave grooves formed in the support frame of the moisture separator main body and fix the corrugated plate are formed in different shapes. In this way, since both ends of the corrugated sheet can be identified at a glance, there is no possibility of inserting the corrugated sheet upside down. Therefore, the corrugated sheet can be easily attached and the burden on the worker is greatly reduced. In addition, there is no mistake in attaching corrugated plates. For example, one of the two end portions of the corrugated plate may be a flat surface and the other may be provided with a bent portion.

The corrugated plate manufacturing method of the moisture separator of the present invention is
In the corrugated plate manufacturing method for a moisture separator, in which wet steam is caused to flow through a flow path formed between corrugated plates disposed at a predetermined interval from each other, and droplets in the wet steam are collected.
A thin plate cut into a desired size is folded in half, the opposing surfaces are brought into contact with each other, and folded to leave a portion for forming a droplet collection pocket. A first step of forming a portion and other planar portions;
A second step of forming a mountain valley by leaving the vicinity of the convex portion forming the peak as a plane and bending the other plane;
And a third step of bending the convex portion into a pocket shape so as to cover the flat peak portion.

  According to the method of the present invention, with the above-described configuration, a corrugated plate having a flat portion at the top of the mountain and a droplet collection pocket provided so as to cover the flat portion can be easily manufactured with a small number of man-hours. In addition, since it can be manufactured by molding from a single thin plate, the operation of attaching the droplet collection pocket can be eliminated. Therefore, compared with the case where the droplet collection pocket is joined to the corrugated plate, the number of manufacturing steps can be greatly reduced. Moreover, since the number of parts can be reduced as compared with the joining operation, the reliability of the apparatus can be improved.

  In the method of the present invention, preferably, in the third step, the width and depth of the internal space formed by the pocket-shaped bent portion are formed larger than the inlet opening width of the pocket-shaped bent portion. As a result, the internal volume of the droplet collection pocket can be increased, the droplet collection capability can be increased, and the droplet once collected in the droplet collection pocket can be prevented from scattering again.

  Further, in the method of the present invention, preferably, a fourth step is added in which both end portions of the corrugated plate that are inserted into the concave grooves formed in the support frame of the moisture separator main body and fix the corrugated plate are formed in different shapes. Good. If the both end portions of the corrugated plate are formed in different shapes in this way, as described above, the both end portions of the corrugated plate can be identified at a glance, so that there is no possibility that the corrugated plate is erroneously inserted upside down. Therefore, the corrugated sheet can be easily attached and the burden on the worker is greatly reduced.

  According to the apparatus of the present invention, the corrugated plate has a zigzag cross section in which peaks and valleys are alternately formed, the flat portion is provided at the peak portion of the corrugated plate, covers the flat portion, and flows along the corrugated plate surface. A liquid droplet collecting pocket that opens toward the wet steam flow, and the width and depth of the internal space of the liquid droplet collecting pocket are made larger than the width of the inlet opening of the liquid droplet collecting pocket; It is possible to improve the droplet collecting ability by the droplet collecting pocket and to prevent the droplet once collected in the droplet collecting pocket from re-scattering.

  Further, according to the method of the present invention, a thin plate cut to a desired size is folded in half, the opposing surfaces are brought into contact with each other, and the portion for forming the droplet collection pocket is left and folded. A first step for forming a droplet collecting pocket forming convex portion and other flat portions, and forming a valley portion by bending the other flat portions while leaving the vicinity of the convex portion forming the peak portion as a flat surface. By comprising the second step and the third step of bending the convex portion into a pocket shape so as to cover the flat peak, the production of the corrugated plate applicable to the moisture separator of the present invention is shortened. It can be easily performed by the process.

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the component parts described in this embodiment are not intended to limit the scope of the present invention to that unless otherwise specified.
(Embodiment 1)

  Next, a first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a cross-sectional view showing a part of a corrugated plate according to this embodiment, FIG. 2 is an explanatory diagram showing the principle of collecting droplets by the corrugated plate, and FIG. 3 is a process showing a processing procedure of the corrugated plate FIG. 4 and FIG. 4 are plan views illustrating the attachment structure of the corrugated plate to the moisture separator main body.

  In FIG. 1, the corrugated plate 83 according to the present embodiment includes an inclined portion 85, a peak portion 86 formed in a planar shape, and a droplet collection pocket 84 formed so as to cover the peak portion 86. The As shown in FIG. 3, the corrugated sheet 83 of the present embodiment is obtained by bending a corrugated sheet in which three ridges and valleys are continuously provided from one thin sheet (for example, a material of SUS304 and a thickness of 1.2 mmt). To manufacture. The inlet opening width a of the inlet opening 84a of the droplet collection pocket 84 is set to 5 mm, for example. The depth b of the droplet collection pocket of the droplet collection pocket 84 and the width c of the droplet collection pocket are formed larger than the inlet opening width a.

  Next, the principle of droplet collection according to the present embodiment will be described with reference to FIG. In FIG. 2, when the wet steam flow S <b> 1 flows in the direction of the arrow, the droplets contained in the wet steam S <b> 1 hit the surface of the inclined portion 85 of the corrugated plate 83 and adhere to the surface to form a liquid film l. The liquid film l is pushed by the flow of the wet steam flow S1 and proceeds in the direction of the arrow along the surface of the inclined portion 85. Then, it reaches the summit 86. The summit 86 is pushed by the wet steam flow S <b> 1 and enters the droplet collection pocket 84 from the inlet opening 84 a of the droplet collection pocket 84.

  On the other hand, the wet steam flow S1 travels outside the droplet collection pocket 84 and flows to the downstream side through the space between the crest portion 86 of the corrugated plate 83 disposed adjacently. Accordingly, only the droplets can be smoothly put into the droplet collection pocket 84. Therefore, the droplet collection accuracy can be improved. Once the liquid film l is in the droplet collection pocket 84, the inlet opening width a of the inlet opening 84a is narrow and the internal space of the droplet collection pocket 84 is wide, so that it is difficult to re-scatter.

  Next, the manufacturing procedure of the corrugated sheet 83 according to the present embodiment will be described with reference to FIG. In FIG. 3, first, as shown in FIG. 3A, one thin metal plate (for example, made of SUS) cut out to a desired size is prepared. Next, as shown in FIG. 3 (b), the thin plate 80 is folded in half at three locations, the opposing surfaces are brought into contact with each other, and the portion for forming a droplet collection pocket is left. Thereby, the convex part 81 and the plane part 82 for forming the droplet collection pocket are formed. Next, as shown in FIG. 3C, the inclined portion 85 is formed by bending the other flat portion 82 while leaving the flat portion forming the peak portion 86. At this point, the original shape of the corrugated plate 83 is formed.

  Next, as shown in FIG. 3D, the convex portion 81 is bent in the direction in which the wet steam S1 flows to form the droplet collection pocket 84. In addition, in order to attach the corrugated sheet 83 to the support frame surface of the moisture separation part 08, the insertion parts 87 and 88 inserted in the ditch | groove provided in this support frame surface are formed in the both ends of the corrugated sheet 83. Next, as shown in (e), one insertion portion 88 is bent into an L shape. The corrugated plate 83 is formed by such a procedure.

  The corrugated plate 83 formed and processed in this way is attached to the moisture separator 08 of the moisture separator 01. In this case, as shown in FIG. 4, the corrugated plate 83 is fixed by inserting the insertion portions 87 and 88 formed at both ends of the corrugated plate 83 into the grooves provided in the support frames 89 and 90 in the moisture separating portion 08. To do. Here, in the concave groove 91 of the support frame 89 into which the planar insertion portion 87 is inserted, a planar concave groove 91 that matches the insertion portion 87 is formed. A concave groove 92 having an L-shaped cross section that matches the shape of the insertion portion 88 is formed in the concave groove 92 of the support frame 90 in which the insertion portion 88 having an L-shaped cross section is inserted.

  Therefore, when the corrugated plate 83 is attached to the moisture separating portion 08, if the corrugated plate 83 is attached in reverse, the shape of the insertion portion 87 or 88 and the shape of the concave groove 91 or 92 do not match. It cannot be installed. Further, since the shapes of the insertion portions 87 and 88 of the corrugated plate 83 are different from the shapes of the concave grooves 91 and 92 of the support frames 89 and 90, the insertion portions 87 and 88 can be easily identified. Therefore, there is no fear of reversing the attachment of the corrugated plate 83 and it can be easily attached, reducing the burden on the worker.

  According to the present embodiment, the droplets included in the wet steam flow S1 hitting the partition walls of the inclined portion 85 adhere to the partition walls, and the droplets attached to the partition walls are pushed by the wet steam S1 and applied to the partition walls. Along the mountain top portion 86, the droplet collecting pocket 84 opened to the wet steam flow S1 side at the mountain top portion 86 can smoothly enter the inside. Since the wet steam S1 goes to the downstream side through the outside of the droplet collection pocket 84, the droplet collection accuracy is improved.

  Further, since the peak portion 86 is a flat portion, it is easy to make the width c and depth b of the internal space of the droplet collection pocket 86 larger than the inlet opening width a of the inlet opening 84a. Therefore, since the internal volume of the droplet collection pocket 86 can be increased, the droplet collection capability is improved. Further, since the inlet opening 84a is narrower than the width c of the droplet collection pocket, the droplet once collected in the droplet collection pocket 84 is difficult to re-scatter.

  In addition, since the corrugated plate 83 can be manufactured by using only one thin plate and bending it by the molding procedure shown in FIG. 3, compared to the case where the droplet collection pocket is joined to the corrugated plate body as in the prior art, The manufacturing process can be greatly shortened.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to improve the droplet collection effect of the corrugated sheet used for the moisture separation (heating) apparatus applied to a power plant etc., the manufacturing process of a corrugated sheet can be simplified greatly.

It is sectional drawing which shows a part of corrugated sheet concerning 1st Embodiment of this invention. It is explanatory drawing which shows the droplet collection principle by this corrugated sheet concerning the said 1st Embodiment. It is process drawing which shows the process sequence of the corrugated sheet which concerns on the said 1st Embodiment. It is a plane view explanatory drawing which shows the attachment structure to the moisture separator main body of the corrugated sheet which concerns on the said 1st Embodiment. It is a vertical elevation view of a conventional moisture separator. FIG. 6 is a transverse side view taken along line AA in FIG. 5. It is a perspective view which shows the moisture separation part (corrugated sheet installation part) provided in the conventional moisture separator. It is sectional drawing which shows an example of the conventional corrugated sheet. It is sectional drawing of the corrugated sheet of another conventional structure.

Explanation of symbols

01 Moisture Separator 08 Moisture Separation Part 83 Corrugated Plate 84 Droplet Collection Pocket 84a Inlet Opening 85 Inclined Part 86 Peak Top 89, 90 Support Frame 91, 92 Concave Groove a Inlet Opening Width b Depth of Droplet Collection Pocket c Droplet collection pocket width S1 Wet steam S2 Dry steam

Claims (6)

A moisture separator comprising a plurality of corrugated plates disposed at a predetermined interval from each other, and flowing wet steam through a flow path formed between the corrugated plates to collect droplets in the wet steam In, the corrugated plate has a zigzag cross section in which a mountain valley is alternately formed,
Provided with a flat portion at the top of the corrugated plate, provided with a droplet collection pocket that covers the flat portion and opens toward the wet steam flow flowing along the corrugated surface,
A moisture separation device characterized in that the width and depth of the internal space of the droplet collection pocket are formed larger than the inlet opening width of the droplet collection pocket.   The moisture separator according to claim 1, wherein the corrugated plate is formed by bending one thin plate including the droplet collecting pocket.   The moisture separator according to claim 1, wherein both ends of the corrugated plate, which is inserted into a concave groove formed in a support frame of the moisture separator main body and fixes the corrugated plate, are formed in different shapes. apparatus. In the corrugated plate manufacturing method for a moisture separator, in which wet steam is caused to flow through a flow path formed between corrugated plates disposed at a predetermined interval from each other, and droplets in the wet steam are collected.
A thin plate cut into a desired size is folded in half, the opposing surfaces are brought into contact with each other, and folded to leave a portion for forming a droplet collection pocket. A first step of forming a portion and other planar portions;
A second step of forming a mountain valley by leaving the vicinity of the convex portion forming the peak as a plane and bending the other plane;
A corrugated plate manufacturing method for a moisture separator, comprising: a third step of bending the convex portion into a pocket shape so as to cover the flat peak portion.   5. The corrugated plate manufacturing method for a moisture separator according to claim 4, wherein in the third step, the width and depth of the internal space formed by the pocket-shaped bent portion are formed larger than the inlet opening width.   5. A fourth step of adding both ends of the corrugated sheet, which is inserted into a concave groove formed in a support frame of the moisture separator main body and fixing the corrugated sheet, into different shapes, is added. A method for producing a corrugated sheet for a moisture separator according to claim 1.

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