WO2017090557A1

WO2017090557A1 - Moisture separator/heater

Info

Publication number: WO2017090557A1
Application number: PCT/JP2016/084480
Authority: WO
Inventors: 圭吾西田; 大智吉井; 石黒　達男; 太一中村
Original assignee: 三菱日立パワーシステムズ株式会社
Priority date: 2015-11-25
Filing date: 2016-11-21
Publication date: 2017-06-01

Abstract

This moisture separator/heater is provided with a housing, a moisture separation device, a heating device, and a drain discharge device. The moisture separation device includes a lower moisture separation element that extends in a first horizontal direction, and an upper moisture separation element that extends in the first horizontal direction and is disposed above the lower moisture separation element. The drain discharge device includes: a lower drain head that extends in the first horizontal direction; an upper drain head that extends in the first horizontal direction; a trough that is disposed below the lower drain head, extends in the first horizontal direction, and protrudes further in a second horizontal direction than the lower drain head; and at least one inner drain pipe that extends vertically between the trough and the upper drain head and connects the trough and the upper drain head.

Description

Moisture separator heater

This disclosure relates to a moisture separator heater.

The moisture separation heater is used in, for example, a nuclear power plant, and is configured to separate moisture from steam discharged from a high-pressure turbine and to heat dry steam to provide it to a low-pressure turbine.
As this type of moisture separation heater, for example, a moisture separator disclosed in Patent Document 1 has a moisture separation element, and the moisture separation element has a plurality of corrugated separator vanes. Further, the moisture separator has a heating tube group as a heating device downstream of the moisture separation element in the steam flow direction. Therefore, the dry steam from which moisture has been separated by the moisture separation element is heated when passing through the heating tube group.
On the other hand, the separator vane of the moisture separation element is supported by upper and lower support frames, and a drain opening is formed in the lower support frame. The moisture separated from the steam by the separator vane flows down as drain along the separator vane, and is discharged from the drain opening to the drain passage.

Further, in the moisture separator structure disclosed in Patent Document 2, corrugated plate-type steam separators are arranged so as to be shifted laterally in two upper and lower stages. In addition, a vertical drain pipe is provided in the separated water reservoir of the upper air / water separator, and a drainage short hanging from the separated water reservoir of the upper air / water separator is provided in an intermediate water collection box formed integrally with the separated water reservoir of the lower air / water separator. The tube is in contact.

International Publication No. 2008/026325 Japanese Utility Model Publication No. 61-98513

Also in the moisture separator disclosed in Patent Document 1, it is conceivable that the moisture separation elements are stacked in two stages up and down in order to increase the flow path area of the steam in the moisture separation element and the heating device. In this case, it becomes a problem how to smoothly drain the drain from each of the moisture separation elements stacked in two stages.

In view of the above circumstances, an object of at least one embodiment of the present invention is to provide a moisture separation heater provided with a drain discharge device capable of smoothly discharging drain from each of the moisture separation elements stacked in two stages above and below. There is to do.

(1) A moisture separator / heater according to at least one embodiment of the present invention comprises:
A housing with a steam channel defined therein;
A moisture separator arranged in the steam flow path and capable of separating the moisture from steam containing moisture;
A heating device that is positioned downstream of the moisture separator and disposed in the steam flow path and capable of heating the steam;
A drain discharger capable of discharging the moisture separated by the moisture separator out of the housing;
With
The moisture separator is
A lower moisture separation element extending in a first horizontal direction;
An upper moisture separation element extending in the first horizontal direction and disposed above the lower moisture separation element;
Including
The drain discharge device
A lower drain header portion protruding from the lower moisture separation element in a second horizontal direction orthogonal to the first horizontal direction and extending in the first horizontal direction;
An upper drain header portion that protrudes from the lower moisture header in the second horizontal direction and extends in the first horizontal direction from the upper moisture separation element;
A flange that is disposed below the lower drain header portion, protrudes in the second horizontal direction from the lower drain header portion, and extends in the first horizontal direction;
At least one internal drain pipe extending in the vertical direction between the upper drain header portion and the flange portion and communicating between the upper drain header portion and the flange portion;
including.

According to the configuration (1), the drain collected by the upper moisture separation element is discharged through the upper drain header portion protruding from the upper moisture separation element, and the drain collected by the lower moisture separation element is It is discharged through a lower drain header portion protruding from the moisture separation element. For this reason, the drain collected by the upper moisture separation element does not flow down the lower moisture separation element as it is, and the drain once collected by the upper moisture separation element passes through the lower moisture separation element. To be taken away.
The internal drain pipe extends in the vertical direction between the upper drain header portion and the flange portion, and the drain collected by the upper moisture separation element is discharged without passing through the lower drain header portion. For this reason, the drain can smoothly flow in the lower drain header portion, and the drain collected by the upper moisture separation element and the drain collected by the lower moisture separation element can be discharged smoothly.

(2) In some embodiments, in the configuration (1),
In the at least one internal drain pipe, the drain flowing down at least the upper end side of the at least one internal drain pipe flows down in a film shape along the inner peripheral surface of the upper end side of the at least one internal drain pipe. It is configured as follows.
In the configuration (2), since the internal drain pipe is configured such that the drain flows down in a film shape on the upper end side of the internal drain pipe, the drain flowing down the internal drain pipe is prevented from entraining steam. . For this reason, since generation | occurrence | production and extinction of the bubble in an internal drain pipe, and a raise of a bubble are suppressed, a drain can flow stably in an internal drain pipe. For this reason, according to the said structure (2), the drain collected with the upper stage moisture separation element can be smoothly discharged | emitted through an internal drain pipe.

(3) In some embodiments, in the configuration (1) or (2),
The upper drain header portion has an upper drain header outlet that communicates with the internal drain pipe,
The drain discharge device
Two or more pieces positioned on both sides of the upper drain header outlet in the first horizontal direction and disposed on the bottom surface of the upper drain header portion and partially surrounding the upper drain header outlet in the circumferential direction It further includes a protrusion.

When the flow rate of the drain flowing into the upper drain header portion increases, the drain that flows from both sides toward the upper drain header outlet in the first horizontal direction (longitudinal direction of the upper drain header portion) becomes 2 on both sides in the longitudinal direction. It flows into the upper drain header outlet from the location. And the flow of the drain which flowed into the upper drain header outflow port from both sides in the longitudinal direction merges in the internal drain pipe, and it becomes difficult to form self-bending. In this respect, according to the configuration (3), two protrusions are provided on both sides of the first horizontal direction, the flow of drain in the first horizontal direction is weakened, and the drain is circumferential with respect to the internal drain pipe. It will flow evenly. Thereby, the drain flowing down the upper end side of the internal drain pipe can flow down in a film shape along the inner peripheral surface of the upper end side of the internal drain pipe.

(4) In some embodiments, in any one of the configurations (1) to (3),
The area of the soot inlet that communicates the flange and the at least one internal drain pipe is smaller than the area of the upper drain header outlet that communicates the upper drain header part and the at least one internal drain pipe.
In the configuration (4), since the area of the dredging inlet is smaller than the area of the upper drain header outlet, the drain flowing down the internal drain pipe can be temporarily stored on the lower end side of the internal drain pipe. Thereby, even if the steam flows into the collar portion together with the drain, the steam is suppressed from rising in the internal drain pipe. As a result, the backflow of the drain in the internal drain pipe is suppressed, and the drain collected by the upper moisture separation element can be smoothly discharged through the internal drain pipe.

(5) In some embodiments, in any one of the configurations (1) to (4),
The drain discharge device further includes a water seal portion capable of sealing the lower end portion of the at least one internal drain pipe.
In the configuration (5), since the lower end portion of the internal drain pipe is sealed by the water seal portion, even if the steam flows into the flange portion together with the drain, the steam is suppressed from rising in the internal drain pipe. As a result, the backflow of the drain in the internal drain pipe is suppressed, and the drain collected by the upper moisture separation element can be smoothly discharged through the internal drain pipe.

(6) In some embodiments, in any one of the above configurations (1) to (5),
The drain discharge device
An assembly provided integrally with the collar, and projecting downward from the collar;
A drain discharge pipe extending downward from the gathering portion;
Is further included.
In the said structure (6), since the gathering part which protrudes below from a collar part was provided, the drain in a collar part flows in into a gathering part. Thereby, it is possible to prevent the drain from accumulating excessively in the collar portion, and the drain in the collar portion can be discharged smoothly.

(7) In some embodiments, in the configuration (6),
The bottom surface of the flange portion extends while being inclined with respect to the first horizontal direction so as to gradually become lower toward the gathering portion.
In the configuration (7), since the bottom surface of the flange portion is inclined with respect to the first horizontal direction, the drain can be discharged smoothly through the collecting portion.

According to at least one embodiment of the present invention, there is provided a moisture separation heater provided with a drain discharge device capable of smoothly discharging drain from each of the moisture separation elements stacked in two stages.

It is a figure which shows schematic structure of the secondary steam circulation system of the nuclear power plant to which the moisture separation heater which concerns on one Embodiment of this invention was applied. It is a schematic cross-sectional view of a moisture separation heater. FIG. 3 is a schematic sectional view taken along line III-III in FIG. 2. FIG. 4 is a schematic sectional view taken along line IV-IV in FIG. 2. FIG. 5 is a schematic sectional view taken along line VV in FIG. 2. FIG. 3 is a schematic cross-sectional view taken along line VI-VI in FIG. 2. It is a partial notch perspective view which shows the schematic structure of the moisture separation element applied to the moisture separation heater of FIG. It is sectional drawing which shows schematically the structure of the drain discharge device applicable to the moisture separation heater of FIG. 1 with a moisture separator. It is a top view which shows roughly a part of structure of the drain discharge device seen in the direction of the arrow IX in FIG. It is a figure for demonstrating an example of the mode of the drain which flows down in the inside drain pipe in a drain discharge device. It is a figure for demonstrating the structure of the drain discharge apparatus which concerns on sectional drawing which follows the XI-XI line in FIG. 9 which concerns on other one Embodiment. It is a perspective view which shows roughly the structure of the upper stage drain header outflow port periphery of the drain discharge apparatus of FIG. It is sectional drawing which shows schematically the structure of the drain discharge apparatus which concerns on other one embodiment applicable to the moisture separation heater of FIG. 1 with a moisture separation apparatus. It is sectional drawing which shows schematically the structure of the drain discharge apparatus which concerns on other one embodiment applicable to the moisture separation heater of FIG. 1 with a moisture separation apparatus. It is a top view which shows roughly a part of structure of the drain discharge device seen in the direction of the arrow XV in FIG. FIG. 16 is a view corresponding to FIG. 15 of a drain discharge device according to another embodiment applicable to the moisture separation heater of FIG. 1.

Hereinafter, some embodiments of the present invention will be described with reference to the accompanying drawings. However, the dimensions, materials, shapes, relative arrangements, etc. of the components described in the embodiments or shown in the drawings are not intended to limit the scope of the present invention, but are merely illustrative examples. Absent.
For example, expressions expressing relative or absolute arrangements such as “in a certain direction”, “along a certain direction”, “parallel”, “orthogonal”, “center”, “concentric” or “coaxial” are strictly In addition to such an arrangement, it is also possible to represent a state of relative displacement with an angle or a distance such that tolerance or the same function can be obtained.
For example, an expression indicating that things such as “identical”, “equal”, and “homogeneous” are in an equal state not only represents an exactly equal state, but also has a tolerance or a difference that can provide the same function. It also represents the existing state.
For example, expressions representing shapes such as quadrangular shapes and cylindrical shapes represent not only geometrically strict shapes such as quadrangular shapes and cylindrical shapes, but also irregularities and chamfers as long as the same effects can be obtained. A shape including a part or the like is also expressed.
On the other hand, the expressions “comprising”, “comprising”, “comprising”, “including”, or “having” one constituent element are not exclusive expressions for excluding the existence of the other constituent elements.

FIG. 1 shows a schematic configuration of a secondary steam circulation system 2 of a nuclear power plant to which a moisture separation heater 1 according to an embodiment of the present invention is applied.
The secondary steam circulation system 2 has, for example, a circulation path 4 through which water as a working fluid circulates with phase transformation. The circulation path 4 includes a steam generator 6, a high-pressure turbine 8, and a moisture separation heater. 1, the low-pressure turbine 10, the condenser 12, the deaerator 14, the feed water pump 16, and the high temperature heater 18 are inserted in this order in the flow direction of water. The high-pressure turbine 8 and the low-pressure turbine 10 are connected to a generator 20, and can generate electric power by driving the generator 20 using the steam generated by the steam generator 6.
On the other hand, the moisture separator 1 can remove moisture from the steam containing moisture discharged from the high-pressure turbine 8 and supply dry steam to the low-pressure turbine 10.

Here, FIG. 2 shows a schematic cross section of the moisture separator heater 1. FIG. 3 is a schematic cross-sectional view taken along line III-III in FIG. FIG. 4 is a schematic sectional view taken along line IV-IV in FIG. FIG. 5 is a schematic cross-sectional view taken along the line VV in FIG. FIG. 6 is a schematic cross-sectional view taken along the line VI-VI in FIG. FIG. 7 is a partially cutaway perspective view showing a schematic configuration of a moisture separation element 27 applied to the moisture separation heater 1 of FIG. 1.

As shown in FIGS. 2 to 6, the moisture separation heater 1 includes a housing 24, a moisture separation device 26, a heating device 28, and a drain discharge device 30, and a manifold as necessary. 32.
The housing 24 has, for example, a cylindrical shape, and is placed horizontally so that the axial direction of the housing 24 matches the horizontal direction. The housing 24 is provided with a steam inlet 34 for steam containing moisture (wet steam) and a steam outlet 36 for steam (dry steam) from which moisture has been removed and heated. A steam flow path 38 for steam extending from the steam inlet 34 to the steam outlet 36 is defined inside the housing 24. For example, the steam inlet 34 is provided at one end of the housing 24, and the steam outlet 36 is provided in the center of the housing 24 in the axial direction (first horizontal direction). The steam outlet 36 is opened, for example, in the horizontal direction.

The manifold 32, the moisture separator 26, and the heating device 28 are accommodated in the housing 24, and are arranged in the steam flow path 38 in this order in the flow direction of the steam. For example, the manifold 32, the moisture separator 26, and the heating device 28 are sequentially arranged in a horizontal direction (second horizontal direction) orthogonal to the axial direction of the housing 24.
The manifold 32 is made of, for example, punching metal and has a function of distributing wet steam to the entire moisture separator 26. The punching metal extends, for example, in the vertical direction and the axial direction of the housing 24, and divides the interior of the housing 24 into two regions adjacent to each other in the horizontal direction. In this case, the wet steam sequentially passes through the punching metal, the moisture separator 26 and the heater 28 in the second horizontal direction, and flows out from the steam outlet 36 in the horizontal direction.

The moisture separator 26 can separate moisture from steam containing moisture. The moisture separator 26 has two moisture separation elements 27 stacked in two stages, ie, a lower moisture separation element 27a and an upper moisture separation element 27b.
The lower moisture separation element 27 a extends in the axial direction (first horizontal direction) of the housing 24.
The upper moisture separation element 27b extends in the axial direction of the housing 24 and is disposed above the lower moisture separation element 27a.
The lower moisture separation element 27a and the upper moisture separation element 27b can be configured by the moisture separation element 27, respectively. In this case, two moisture separation elements 27 are stacked one above the other.

As shown in FIG. 7, the moisture separation element 27 includes a plurality of vanes 40, a lower frame 42, an upper frame 44, and holding

portions

46 and 47.
The vane 40 is, for example, a chevron vane, and is configured by a plate bent so as to have a plurality of peaks and valleys. The plurality of vanes 40 are arranged in the axial direction (first horizontal direction) of the housing 24 with a gap between them. The gaps between the vanes 40 extend in a zigzag manner in a horizontal direction (second horizontal direction) orthogonal to the axial direction of the housing 24, and moisture contained in the steam flows through the gaps between the vanes 40. Separated from the steam. And the separated moisture flows down along the vane 40 as a drain.

Each of the lower frame 42 and the upper frame 44 has a U-shaped cross section and extends in the axial direction of the housing 24. The lower frame 42 and the upper frame 44 sandwich the plurality of vanes 40 in the vertical direction while being separated from each other in the vertical direction. Therefore, the steam can flow in the second horizontal direction between the lower frame 42 and the upper frame 44.
The holding

portions

46 and 47 are attached to the inside of the

side walls

42 a and 44 a of the lower frame 42 and the upper frame 44, and have a plurality of notches that can receive the side edges of the vane 40. With the side edges of the vanes 40 engaged with the notches, the vanes 40 are held with a gap between them.

The heating device 28 is located in the downstream of the moisture separator 26 and is disposed in the steam flow path 38, and can heat the steam. The heating device 28 includes a heating medium header 48 and a plurality of heating medium tubes 50 connected to the heating medium header 48. High temperature steam as a heating medium is supplied to the plurality of heating medium tubes 50 through the heating medium header 48, and the steam that has passed through the moisture separator 26 passes through the gaps between the heating medium tubes 50. To be heated. That is, the heating device 28 is configured by a tube-type heat exchanger.
In the present embodiment, the two heating devices 28 are arranged in series downstream of the moisture separator 26.

The drain discharge device 30 can discharge the moisture separated by the moisture separation device 26 out of the housing 24.
Here, FIG. 8 is a cross-sectional view schematically showing the configuration of the drain discharge device 30a together with the moisture separation device 26 as one embodiment of the drain discharge device 30 applicable to the moisture separation heater 1 of FIG. It is.
FIG. 9 is a plan view schematically showing a part of the configuration of the drain discharge device 30 (30a) viewed in the direction of the arrow IX in FIG.
FIG. 10 is a view for explaining an example of the state of the drain flowing down in the internal drain pipe 56 in the drain discharge device 30.
FIG. 11 is a diagram for explaining a configuration of a drain discharge device 30b as another embodiment of the drain discharge device 30 corresponding to a cross-sectional view taken along the line XI-XI in FIG.
FIG. 12 is a perspective view schematically showing a configuration around the upper drain header outlet 54a of the drain discharge device 30b.
FIG. 13 is a cross-sectional view schematically showing a configuration of a drain discharge device 30c according to another embodiment applicable to the moisture separation heater 1 of FIG.
FIG. 14 is a cross-sectional view schematically showing a configuration of a drain discharge device 30d according to another embodiment applicable to the moisture separation heater 1 of FIG.
FIG. 15 is a plan view schematically showing a part of the configuration of the drain discharging device 30d as seen in the direction of the arrow XV in FIG.
FIG. 16 is a view corresponding to FIG. 15 of a drain discharge device 30e according to another embodiment applicable to the moisture separation heater 1 of FIG.
In the following description, the drain discharge devices 30a to 30e are collectively referred to as the drain discharge device 30.

As shown in FIGS. 8 to 10 and 13 to 16, the drain discharge device 30 includes a lower drain header portion 52, an upper drain header portion 54, a flange portion 55, and at least one internal drain pipe 56. Have
The lower drain header portion 52 protrudes from the lower moisture separation element 27a in a second horizontal direction orthogonal to the axial direction (first horizontal direction) of the housing 24, and extends in the first horizontal direction. The lower drain header portion 52 defines a lower drain channel 58 extending along the lower moisture separation element 27a on the side of the bottom of the lower moisture separation element 27a.
Note that the lower drain header portion 52 is positioned adjacent to the downstream side of the lower frame 42 of the lower moisture separation element 27a in the flow direction of the steam passing through the lower moisture separation element 27a.

The upper drain header portion 54 protrudes from the upper moisture separation element 27b in the second horizontal direction than the lower drain header portion 52 and extends in the first horizontal direction. The upper drain header portion 54 defines an upper drain flow path 60 extending along the upper moisture separation element 27b on the side of the bottom of the upper moisture separation element 27b.
Note that the upper drain header portion 54 is positioned adjacent to the downstream side of the lower frame 42 of the upper moisture separation element 27b in the flow direction of the steam passing through the upper moisture separation element 27b.

The flange portion 55 is disposed below the lower drain header portion 52, protrudes in the second horizontal direction from the lower drain header portion 52, and extends in the first horizontal direction. Note that the flange portion 55 projects further downstream than the lower drain header portion 52 in the flow direction of the steam passing through the lower moisture separation element 27a.
The eaves part 55 divides the eaves flow path 57 extending in the first horizontal direction inside. The lower drain channel 58 is located above the soot channel 57. The bottom of the lower drain header portion 52 opens toward the soot channel 57, and the lower drain channel 58 and the soot channel 57 communicate with each other.

The internal drain pipe 56 extends in the vertical direction between the upper drain header portion 54 and the flange portion 55, and the upper drain header outlet 54 a provided in the upper drain header portion 54 and the soot inlet provided in the flange portion 55. Communication with 55a is made. That is, the internal drain pipe 56 communicates between the soot channel 57 and the upper drain channel 60. The plurality of internal drain pipes 56 are arranged at intervals in the axial direction of the housing 24.

On the other hand, the lower drain flow path 58 communicates with the inside of the lower frame 42 through a drain hole 62 that penetrates the side wall 42 a of the adjacent lower frame 42. Similarly, the upper drain flow path 60 communicates with the inside of the lower frame 42 through a drain hole 64 that penetrates the side wall 42 a of the adjacent lower frame 42.
Further, the lower drain flow path 58 communicates with the inside of the lower frame 42 through the side wall 42a of the adjacent lower frame 42 and, if necessary, the gas vent hole 66 penetrating the holding member 46. The gas vent hole 66 is located above the drain hole 62. Similarly, the upper drain flow path 60 communicates with the inside of the lower frame 42 through the side wall 42a of the adjacent lower frame 42 and, if necessary, the gas vent hole 68 that penetrates the holding member 47. The gas vent hole 68 is located above the drain hole 64.

According to the above configuration, the drain collected by the upper moisture separation element 27b is discharged through the upper drain header portion 54 protruding from the upper moisture separation element 27b, and the drain collected by the lower moisture separation element 27a is It is discharged through the lower drain header portion 52 protruding from the lower moisture separation element 27a. For this reason, the drain collected by the upper moisture separation element 27b does not flow down the lower moisture separation element 27a as it is, and the drain once collected by the upper moisture separation element 27b becomes lower. It is prevented from being taken away by steam passing through the.
Further, the internal drain pipe 56 extends in the vertical direction between the upper drain header portion 54 and the flange portion 55, and the drain collected by the upper moisture separation element 27 b does not pass through the lower drain header portion 52. To be discharged. Therefore, the drain can smoothly flow in the lower drain header portion 52, and the drain collected by the upper moisture separation element 27b and the drain collected by the lower moisture separation element 27a are discharged smoothly. be able to.

In some embodiments, as shown in FIG. 10, the internal drain pipe 56 has a drain flowing down at least the upper end side of the internal drain pipe 56 along the inner peripheral surface on the upper end side of the internal drain pipe 56. It is configured to flow down like a film. That is, the internal drain pipe 56 is configured such that the drain flows down along the inner peripheral surface of the internal drain pipe 56 without the whole inside of the internal drain pipe 56 being filled with drain. Such draining down into a film is also called self-bending.

In the above configuration, the internal drain pipe 56 is configured such that the drain flows down in the form of a film at the upper end side of the internal drain pipe 56, so that the drain flowing down the internal drain pipe 56 is prevented from entraining steam. . For this reason, the generation and disappearance of bubbles in the internal drain pipe 56 and the rise of the bubbles are suppressed, so that the drain can flow stably in the internal drain pipe 56. For this reason, according to the said structure, the drain collected by the upper stage moisture separation element 27b through the internal drain pipe 56 can be discharged | emitted smoothly.
In some embodiments, the flow area of each internal drain pipe 56, the number of internal drain pipes 56, and the like are set so that self-bending is realized.

In order to realize self-bending, the limit value (limit Fr number) of the fluid number (Fr number) in the internal drain pipe 56 capable of realizing self-bending is experimentally obtained, and the Fr number becomes equal to or less than the limit Fr number. Should be designed as follows.
The Fr number is the ratio of inertial force and gravity, the apparent flow velocity (m / s) in the internal drain pipe 56 is Up, the inner diameter (m) of the internal drain pipe 56 is Du, and the gravitational acceleration (m / s ² ) Is g, the Fr number is given by the following formula:
Fr = Up / (Du × g) ^0.5
It is represented by
Here, the flow rate Q of the drain is fixed according to the specification of the plant to which the moisture separator / heater 1 is applied, so that the number of the internal drain pipes 56 is n, the following formula:
Q = 0.25π × Du ^ 2 × n × Up
It is represented by
Therefore, self-bending can be realized by selecting the number n of inner drain pipes 56 and the inner diameter Du so that the Fr number is equal to or less than the limit Fr number while taking the flow rate Q into consideration.

In some embodiments, as shown in FIGS. 11 and 12, the drain discharge device 30 further includes two or more protrusions 69. The protrusions 69 are disposed on both sides of the upper drain header outlet 54a in the first horizontal direction (longitudinal direction of the upper drain header portion 54), and are disposed so as to protrude upward from the bottom surface of the upper drain header portion 54. The drain header outlet 54a is partially surrounded in the circumferential direction. For example, the protrusion 69 is configured by a curved plate that is curved on an arc so as to follow the opening edge of the upper drain header outlet 54a.

When the flow rate of the drain flowing into the upper drain header portion 54 increases, the drain that has flowed from both sides toward the upper drain header outlet 54a in the first horizontal direction (the longitudinal direction of the upper drain header portion 54) becomes longer in the longitudinal direction. It flows into the upper drain header outlet 54a intensively from two places on both sides. And the flow of the drain which flowed into the upper stage drain header outlet 54a from the longitudinal direction both sides merges in the internal drain pipe 56, and it becomes difficult to form self-bending. In this regard, according to the above configuration, the two protrusions 69 are provided on both sides of the first horizontal direction, the flow of drain in the first horizontal direction is weakened, and the drain is evenly distributed in the circumferential direction with respect to the internal drain pipe 56. Will flow into. Thereby, the drain flowing down the upper end side of the internal drain pipe 56 can flow down in a film shape along the inner peripheral surface of the upper end side of the internal drain pipe 56. That is, the self-bending can be maintained by the protrusion 69.

In some embodiments, like the drain discharge device 30a shown in FIGS. 8 and 10, the area of the soot inlet 55a that communicates the soot 55 with at least one internal drain pipe 56 is the upper drain header portion. 54 is smaller than the area of the upper drain header outlet 54 a that communicates the at least one internal drain pipe 56.
In the above configuration, since the area of the soot inlet 55 a is smaller than the area of the upper drain header outlet 54 a, the drain that has flowed down the internal drain pipe 56 can be temporarily stored on the lower end side of the internal drain pipe 56. . Thereby, even if the steam flows into the lower drain header portion 52 together with the drain, the steam is suppressed from rising in the internal drain pipe 56. As a result, the backflow of the drain in the internal drain pipe 56 is suppressed, and the drain collected by the upper moisture separation element 27 b can be smoothly discharged through the internal drain pipe 56.

In some embodiments, as shown in FIGS. 13 and 14, the

drain discharge devices

30 c and 30 d further include a water seal portion 70 that can seal the lower end portion of the internal drain pipe 56.
In the above configuration, since the lower end portion of the internal drain pipe 56 is sealed by the water sealing part 70, even if the steam flows into the lower drain header part 52 together with the drain, the steam may rise in the internal drain pipe 56. It is suppressed. As a result, the backflow of the drain in the internal drain pipe 56 is suppressed, and the drain collected by the upper moisture separation element 27 b can be smoothly discharged through the internal drain pipe 56.
In some embodiments, as shown in FIGS. 13 and 14, the water seal portion 70 has a cup shape and is disposed so as to surround the lower end portion of the internal drain pipe 56. In this case, for example, the internal drain pipe 56 reaches the inside of the flange portion 55, and the water seal portion 70 is disposed in the flange portion 55.

In some embodiments, like the

drain discharge devices

30a, 30c, and 30d shown in FIGS. 8, 13, and 14, the drain discharge device 30 includes a drain discharge pipe 74 that extends downward from the flange portion 55. In addition. Through the drain discharge pipe 74, the drain collected by the lower moisture separation element 27 a and the upper moisture separation element 27 b is discharged out of the housing 24.
In some embodiments, like the

drain discharge devices

30d and 30e shown in FIGS. 14 to 16, the drain discharge device 30 is connected to a part of the flange portion 55 and protrudes downward from the flange portion 55. The drainage pipe 74 further includes a gathering portion 72, and extends downward from the gathering portion 72. The collecting portion 72 defines a collecting channel 76 that communicates the soot channel 57 and the drain discharge pipe 74.

In the above configuration, since the collecting portion 72 protruding downward from the flange portion 55 is provided, the drain in the flange portion 55 flows into the collecting portion 72. Thereby, it is possible to prevent the drain from accumulating excessively in the flange portion 55, and the drain in the flange portion 55 can be discharged smoothly.
In some embodiments, the flow area of each drain discharge pipe 74 and the number of drain discharge pipes 74 are set so that self-bending is also realized in the drain discharge pipe 74.

In some embodiments, the cross-sectional area of the flange portion 55 is larger than the cross-sectional area of the lower drain header portion 52, as in the

drain discharge devices

30a, 30c, and 30d shown in FIGS.
In some embodiments, the volume of the flange portion 55 is larger than the volume of the lower drain header portion 52 or the volume of the upper drain header portion 54, or the volume of the lower drain header portion 52 and the volume of the upper drain header portion 54. It is larger than the combined volume.
In some embodiments, as shown in FIG. 14, the cross-sectional area of the collecting portion 72 is larger than the cross-sectional area of the lower drain header portion 52.
The volume of the collecting portion 72 is set so that excessive drainage does not accumulate in the flange portion 55 according to the expected drain flow rate.
In some embodiments, like the

drain discharge devices

30a, 30c, and 30d shown in FIGS. 8, 13, and 14, the flange portion 55 protrudes from the lower drain header portion 52 in the second horizontal direction, In the second horizontal direction, the drain discharge pipe 74 is disposed at a position different from the internal drain pipe 56.
In some embodiments, like the

drain discharge devices

30d and 30e shown in FIGS. 14 to 16, the collecting portion 72 protrudes from the flange portion 55 in the second horizontal direction, and in the second horizontal direction, The drain discharge pipe 74 is disposed at a position different from the internal drain pipe 56.

In some embodiments, like the drain discharge device 30e shown in FIG. 16, the bottom surface of the flange portion 55 is gradually lowered toward the collecting portion 72 in the axial direction of the housing 24 (first horizontal direction). ) With an inclination angle θ.
In the above configuration, since the bottom surface of the flange portion 55 is inclined with respect to the first horizontal direction, the drain can be discharged smoothly through the collecting portion 72.

The present invention is not limited to the above-described embodiments, and includes forms obtained by changing the above-described embodiments and forms obtained by combining these forms.

DESCRIPTION OF SYMBOLS 1 Moisture separation heater 2 Secondary steam circulation system 4 Circulation path 6 Steam generator 8 High pressure turbine 10 Low pressure turbine 12 Condenser 14 Deaerator 16 Feed water pump 18 High temperature heater 20 Generator 22 Humidity separation element 22a Lower stage Moisture separation element 22b Upper stage moisture separation element 24 Housing 26 Moisture separation device 28

Heating device

30, 30a-30e Drain discharge device 32 Manifold 34 Steam inlet 36 Steam outlet 38 Steam flow path 40 Lower frame 40a Side wall 42 Upper frame 42a Side wall 44 Corrugated plate 46 Holding member 47 Holding member 48 Heating medium header 50 Heating medium tube 52 Lower drain header 54 Upper drain header 54a Upper Drain header outlet 55 樋 portion 55 a 樋 inlet 56 internal drain pipe 57 樋 channel 58 lower drain channel 60 upper drain channel 62 drain hole 64 drain hole 66 gas vent hole 68 gas vent hole 69 projection 70 water seal 72 Collecting part 74 Drain discharge pipe 76 Collecting flow path

Claims

A housing with a steam channel defined therein;
A moisture separator arranged in the steam flow path and capable of separating the moisture from steam containing moisture;
A heating device that is positioned downstream of the moisture separator and disposed in the steam flow path and capable of heating the steam;
A drain discharger capable of discharging the moisture separated by the moisture separator out of the housing;
With
The moisture separator is
A lower moisture separation element extending in a first horizontal direction;
An upper moisture separation element extending in the first horizontal direction and disposed above the lower moisture separation element;
Including
The drain discharge device
A lower drain header portion protruding from the lower moisture separation element in a second horizontal direction orthogonal to the first horizontal direction and extending in the first horizontal direction;
An upper drain header portion that protrudes from the lower moisture header in the second horizontal direction and extends in the first horizontal direction from the upper moisture separation element;
A flange that is disposed below the lower drain header portion, protrudes in the second horizontal direction from the lower drain header portion, and extends in the first horizontal direction;
At least one internal drain pipe extending in the vertical direction between the upper drain header portion and the flange portion and communicating between the upper drain header portion and the flange portion;
A moisture separator and heater.
In the at least one internal drain pipe, the drain flowing down at least the upper end side of the at least one internal drain pipe flows down in a film shape along the inner peripheral surface of the upper end side of the at least one internal drain pipe. The moisture separator / heater according to claim 1, wherein the moisture separator heater is configured as described above.
The upper drain header portion has an upper drain header outlet that communicates with the internal drain pipe,
The drain discharge device
Two or more pieces positioned on both sides of the upper drain header outlet in the first horizontal direction and disposed on the bottom surface of the upper drain header portion and partially surrounding the upper drain header outlet in the circumferential direction The moisture separation heater according to claim 1, further comprising a protrusion.
The area of the soot flow inlet that communicates the collar part and the at least one internal drain pipe is smaller than the area of the upper drain header outlet that communicates the upper drain header part and the at least one internal drain pipe. The moisture separation heater according to any one of claims 1 to 3.
The moisture separator / heater according to any one of claims 1 to 4, wherein the drain discharge device further includes a water seal portion capable of sealing a lower end portion of the at least one internal drain pipe. .
The drain discharge device
An assembly provided integrally with the collar, and projecting downward from the collar;
A drain discharge pipe extending downward from the gathering portion;
The moisture separator / heater according to claim 1, further comprising:
7. The moisture separation heating according to claim 6, wherein a bottom surface of the flange portion extends while being inclined with respect to the first horizontal direction so as to be gradually lowered toward the gathering portion. vessel.