JP2015124925A - Moisture separation unit, droplet size coarsening device, and steam dryer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve performance for removing droplets present in wet steam.SOLUTION: A moisture separation unit according to an embodiment comprises: a steam drying unit including a plurality of steam channel formation members having a plurality of capture means and forming partially bent steam channels therebetween; and a droplet diameter increasing device provided on an upstream inlet surface of the steam drying unit, capturing droplets from wet steam to increase droplet diameters, and including a plurality of tubular channels 11c arranged in parallel and extending from a reception port of the supplied wet steam to the steam drying unit. Each of the tubular channels 11c includes an obstacle 15 crossing the channel 11c in a longitudinal direction of the channel for colliding and agglomerating fine droplets.

Description

  Embodiments of the present invention relate to a steam dryer that separates droplets from wet steam, a moisture separation unit used for the droplet dryer, and a droplet diameter increasing device used for the moisture separation unit.

  In general, steam generated in a pressurized water reactor (PWR) steam generator or boiling water reactor (BWR) core is moist steam, and droplets floating in the moist steam are removed by a steam dryer. Later, it is supplied to the steam turbine. In other words, the steam dryer is a cause of blade erosion caused by collision of droplets with blades in a steam turbine, braking loss caused by impingement of moving blades and droplets, and friction loss caused by speed difference between steam and droplets. It has a function of removing the droplets from the vapor.

  As such a steam dryer, one based on the principle that wet steam is guided to a flow path formed by installing a plurality of corrugated vanes and droplets are separated from the steam by inertial force is generally used. ing.

US Patent Application Publication No. 2011/0216872

  If the steam drying section using corrugated vanes is coarse droplets, it has the ability to remove almost 100%. However, the droplets in the steam flowing into the steam dryer have a distributed particle size. In particular, a small droplet having a small inertia force has a lower capture rate than a coarse droplet.

  Therefore, an object of the embodiment of the present invention is to improve the performance of removing droplets existing in wet steam.

  In order to achieve the above-mentioned object, the present embodiment provides a plurality of collecting means for collecting the droplets in a moisture separation unit that removes the droplets in the wet steam containing the droplets in the vapor from the steam. A steam drying section provided with a plurality of steam flow path forming members that form at least partially bent steam flow paths between each other, and an upstream inlet surface of the steam drying section. A droplet diameter increasing device having a plurality of tubular channels arranged in parallel and extending from the inlet of the supplied wet steam to the steam drying section, and viewing the tubular channel from the axial direction. The projection plane has an obstacle crossing the tubular flow path.

  Further, the present embodiment is a droplet diameter coarsening device of a moisture separation unit that removes droplets in wet steam containing droplets in the vapor from the vapor, and includes a plurality of droplets that collect the droplets A collecting means is provided, provided on the upstream inlet surface of the steam drying section having a plurality of steam flow path forming members that form at least a part of the bent steam flow path between each other, and from the wet steam The droplet diameter is increased by capturing the droplet and increasing the diameter of the droplet, and having a plurality of tubular channels arranged in parallel to each other and extending from the inlet of the supplied wet steam to the steam drying section. And an obstacle crossing the tubular flow channel on a projection plane when the tubular flow channel is viewed from the axial direction.

The present embodiment also includes a moisture separation unit that removes the droplets in the steam in the steam dryer that receives the wet steam including droplets in the steam and separates the droplets in the steam, and the removal And a drain processing unit that collects and transports the droplets dropped below the moisture separation unit, and the moisture separation unit is provided with a plurality of collecting means for collecting the droplets. A steam drying section provided with a plurality of steam flow path forming members that form at least partially bent steam flow paths, and an upstream inlet surface of the steam drying section, arranged in parallel with each other And a droplet diameter coarsening device having a plurality of tubular channels extending from the inlet of the supplied wet steam to the steam drying unit, and in a projection plane when the tubular channel is viewed from the axial direction. And having an obstruction traversing the tubular channel It is characterized in.

  According to the embodiment of the present invention, it is possible to improve the performance of removing droplets present in wet steam.

It is a sectional elevation showing the composition of the steam dryer to which the moisture separation unit concerning a 1st embodiment is applied. FIG. 2 is a horizontal sectional view taken along the line II-II in FIG. 1 showing the overall configuration of the moisture separation unit according to the first embodiment. It is a front view of the droplet diameter coarsening apparatus of the moisture separation unit which concerns on 1st Embodiment. It is an elevation sectional view perpendicular to the channel direction of one unit of the droplet diameter coarsening device of the moisture separation unit concerning a 1st embodiment. It is an elevation sectional view along the channel direction of one unit of the droplet diameter coarsening device of the moisture separation unit concerning a 1st embodiment. It is an elevation sectional view along the channel direction of one unit of the droplet diameter coarsening device of the moisture separation unit concerning a 2nd embodiment. It is an elevation sectional view perpendicular to the channel direction of one unit of the droplet diameter coarsening device of the moisture separation unit concerning a 2nd embodiment. It is an elevation sectional view along the channel direction of one unit of the droplet diameter coarsening device of the moisture separation unit concerning a 3rd embodiment. It is an elevation sectional view perpendicular to the channel of one unit of the droplet diameter coarsening device of the moisture separation unit concerning a 3rd embodiment. It is an elevation sectional view along the channel direction of one unit of the droplet diameter coarsening device of the moisture separation unit concerning a 4th embodiment. It is an elevation sectional view perpendicular to the channel of one unit of the droplet diameter coarsening device of the moisture separation unit concerning a 4th embodiment. It is a sectional elevation showing the composition of the moisture separation heater to which the moisture separation unit concerning a 5th embodiment is applied. It is a front view of the inlet side of the droplet diameter coarsening apparatus of the moisture separation unit which concerns on other embodiment.

  Hereinafter, a moisture separation unit according to an embodiment of the present invention will be described with reference to the drawings. Here, the same or similar parts are denoted by common reference numerals, and redundant description is omitted.

[First Embodiment]
FIG. 1 is an elevational sectional view showing a configuration of a steam dryer to which a moisture separation unit according to the first embodiment is applied. FIG. 2 is a horizontal sectional view taken along the line II-II in FIG. 1 showing the overall configuration of the moisture separation unit according to the first embodiment. The steam dryer 1 includes a moisture separation unit 2 having a droplet diameter coarsening device 10 and a steam drying unit 20, an outlet side porous panel 31, a drain processing unit 32 having a drain basket 33 and a drain channel 34, a hood 35, and a support A plate 36 and a support member 38 are provided to receive wet steam containing droplets in the vapor, to separate the droplets and vapor in the vapor, and to reduce the wetness in the vapor.

  A drain rod 33 is mounted on the support plate 36. The drain rod 33 has a rectangular tube shape with an upper part and a lower part opened. On the drain rod 33, the droplet diameter coarsening device 10 and the steam drying unit 20 corresponding to the downstream side thereof are arranged. The upper part of the droplet diameter enlarging apparatus 10 and the steam drying unit 20 is coupled by a support member 38.

  A steam inlet opening 37 is formed beside the drain rod 33 of the support plate 36. An outlet side porous panel 31 is provided on the downstream side of the steam drying unit 20. The steam flow path from the steam inlet opening 37 to the inlet side of the droplet diameter coarsening device 10 is covered by the hood 35 and guided so that the steam flows smoothly. As shown by the arrows in FIG. 1, the steam that has flowed from the steam inlet opening 37 rises in the hood 35 and flows horizontally into the droplet diameter coarsening device 10. The steam that has flowed out of the droplet diameter coarsening device 10 flows into the steam drying unit 20 and flows while changing its direction in the zigzag flow path 22 (FIG. 2) in a substantially horizontal direction. It flows out horizontally.

  Drain holes 33a are formed in a portion of the support plate 36 surrounded by the drain rods 33 at intervals. A drain channel 34 is attached to a lower surface of the support plate 36 in a range substantially corresponding to the drain rod 33. The drain channel 34 is configured to receive the drain flowing down from the drain hole 33a and to be transported in the longitudinal direction (direction perpendicular to the cross section of FIG. 1).

  The steam drying unit 20 includes a plurality of vanes 21 for separating droplets from wet steam by inertia force. The vane 21 is a corrugated plate type. In the steam drying unit 20, a plurality of vanes 21 are arranged at intervals to form a zigzag flow path 22 from the inlet side toward the outlet side. Is formed with an open vane pocket 21a. The steam drying unit 20 causes droplets contained in the wet steam to adhere to the wall surface of the vane 21 to flow into the vane pocket 21a as a liquid film, and causes the liquid film to flow down by gravity. Further, the steam drying unit 20 guides the steam, in which droplets are separated from the wet steam, in the horizontal direction through the zigzag channel 22.

  The droplet diameter increasing device 10 is provided on the upstream inlet surface of the steam drying unit 20. The droplet diameter enlarging apparatus 10 includes a plurality of rhombuses 11 a that are horizontally arranged in parallel to each other and extend to the steam drying unit 20. In addition, the rhombus 11a may be formed with a drain gradient so that the generated liquid pool, that is, the drain flows to the steam drying unit 20 side.

  The upper end portions of the droplet diameter increasing device 10 and the steam drying unit 20 are supported by the support member 38, and the droplet diameter increasing device 10, the lower end portion, and the lower end portions of the steam drying unit 20 are within the inner width of the drain rod 32. is set up. The support plate 36 is provided with a steam inlet opening 37 which is a through hole for leading to the droplet diameter coarsening device 10, and the flow of the inlet steam from the steam inlet opening 37 to the droplet diameter coarsening device 10 inlet. The road is covered with a hood 35.

  The drain basket 33 collects drain water flowing down from the steam drying unit 20. The support plate 36 is provided with a drain hole 33 a that is a through hole for guiding drain water in the drain rod 33 into the drain channel 34. The drain channel 34 collects drain water in the drain rod 33 from the drain hole 33a, guides the drain water to the outermost peripheral portion of the support plate 36, and drains it to the reactor water surface.

  FIG. 3 is a front view of the droplet diameter increasing device of the moisture separation unit according to the first embodiment. In each rhombus tube 11a, the four tube walls 11b (FIG. 4) which are the side surfaces of the rhombus tube 11a are inclined symmetrically. Further, the rhombus tubes 11a are laminated so that the side surfaces are in close contact with each other without being spaced from each other, and each form a tubular flow channel, that is, a rhombus flow channel 11c.

  In addition, triangular tubes 12a and 12b are arranged around the rhombus 11a arranged vertically and horizontally, and the vapor flowing into the droplet diameter coarsening device 10 flows through the rhombus 11a and the triangular tubes 12a and 12b. Flows into either.

  FIG. 4 is a vertical sectional view perpendicular to the flow path direction of one unit of the droplet diameter coarsening device of the moisture separation unit according to the first embodiment. FIG. 5 is an elevational sectional view along the flow path direction of one unit of the droplet diameter coarsening device of the moisture separation unit according to the first embodiment.

  In the vicinity of the entrance of the rhombus 11c, an obstacle is formed between the joints 14a, 14b, 14c, and 14d of the adjacent tube walls 11b so as to cross the channel in the projection plane viewed from the axial direction. The wire 15 is provided. That is, the wires 15 are provided vertically between the joints 14a and 14c facing each other and horizontally between the joints 14b and 14d facing each other. FIG. 4 shows a case where the two wires are in the same plane perpendicular to the flow path direction, intersect each other, and are integrated at the intersection, but the present invention is not limited to this. There may be a case where the two wires do not contact each other at the crossing portion seen in the longitudinal direction but not on the same plane. Moreover, although the case where the wire 15 was provided in the vicinity of the entrance of the rhombus channel 11c was shown, it may be provided at the entrance of the rhombus channel 11c.

  The wire 15 provided in the rhombus 11a has been described above, but wires may be provided in the same way for the triangular tubes 12a and 12b. In this case, for example, the wire may be provided so as to connect between a joint portion on the side surface adjacent to each other and a side surface facing the joint portion.

  In addition, although the case where a wire is provided in the surface perpendicular | vertical to a flow-path direction was shown, the upper end of a surface may incline in the upstream and the lower end may incline toward the downstream with respect to the flow-path direction. At this time, it is desirable to set the inclination in consideration of the fluid force and gravity of the vapor applied to the droplet attached to the wire.

  When wet steam containing droplets flows into the droplet diameter coarsening device 10, the droplets collide with the wire 15 provided near the entrance of the rhombus channel 11c and are captured. The captured droplets aggregate and form a liquid film 17 on the wire 15, between the wires 15, or between the wire 15 and the tube wall 11b. The liquid film 17 travels along the wire 15 and the tube wall 11b of the rhombus 11a by gravity, moves to the bottom of the rhombus 11a, that is, below the rhombus channel 11c, and becomes a liquid reservoir 18. Once the liquid reservoir 18 is formed, the inflow droplet 16a that has carried over without colliding with the wire 15 moves downward due to gravity, collides with the liquid reservoir 18 and is absorbed. As a result, it is possible to prevent a situation in which the droplets carry over from the rhombus channel 11c.

  In addition, rather than dropping into the liquid reservoir 18 due to gravity, there are extremely minute micro droplets 16b that flow out of the rhombus channel 11c due to the flow of steam. However, even if there are such small droplets 16b that flow out without being captured, the proportion of droplets in the vapor at the outlet of the droplet diameter coarsening device 10 is greatly reduced, and the vapor drying section If the predetermined capture efficiency required for the steam dryer 1 is ensured at the outlet of the steam dryer 1 after passing through 20, the object can be achieved.

  The liquid reservoir 18 formed as described above is discharged from the rhombus 11c by being pushed out by the steam flow. The liquid reservoir 18 that has flowed into the steam drying unit 20 from the droplet diameter coarsening device 10 flows into the corrugated vane 21 while a corresponding portion falls downward. Since the corrugated vane 21 can remove almost 100% of the coarse droplets, steam with extremely low wetness can be obtained at the outlet of the steam dryer 20, that is, the outlet of the steam dryer 1. .

[Second Embodiment]
FIG. 6 is an elevational sectional view along the flow path direction of one unit of the droplet diameter coarsening device of the moisture separation unit according to the second embodiment. FIG. 7 is a vertical sectional view perpendicular to the flow path direction of one unit of the droplet diameter coarsening device of the moisture separation unit according to the second embodiment.

  In the droplet diameter increasing device 10 of the steam dryer 1 according to the present embodiment, obstacles are provided in two layers in the flow direction inside each rhombus 11c. That is, the first layer wire 15a and the second layer wire 15b are provided on the downstream side of the first layer wire 15a with an interval in the flow direction. When the rhombus 11c is seen through in the flow direction, the first layer wire 15a and the second layer wire 15b are at different positions. Here, the mutually different positions mean that the first layer wire 15a and the second layer wire 15b do not overlap each other even though there are portions where they intersect each other. In addition, although the case of the two-layer structure of the first layer wire 15a and the second layer wire 15b has been shown, it is not limited to two layers. There may be three or more layers.

  Thus, by making a wire into a multilayer structure, a part of micro droplet 16b (FIG. 5) which could not be captured by the upstream first layer wire 15a can be captured by the second layer wire 15b of the next layer. As in the first embodiment, the captured droplet moves to the bottom of the rhombus 11c by gravity, and a coarse droplet is formed.

[Third Embodiment]
FIG. 8 is an elevational sectional view along the flow path direction of one unit of the droplet diameter coarsening device of the moisture separation unit according to the third embodiment. FIG. 9 is a vertical sectional view perpendicular to the flow path direction of one unit of the droplet diameter coarsening device of the moisture separation unit according to the third embodiment.

  Each of the rhombic tubes 11a of the droplet diameter increasing device 10 in the present embodiment is provided with an X-shaped X-shaped wire 15c as an obstacle. That is, one wire is stretched between the centers of the opposite tube walls 11b, and the two wires intersect at the center to form an X shape.

  In the present embodiment, it can be expected that by extending the X-shaped wire 15c, the probability that the droplet collides with the wire and is captured in the central region of the flow path cross section where the flow velocity of the steam is high.

[Fourth Embodiment]
FIG. 10 is an elevational sectional view along the flow path direction of one unit of the droplet diameter coarsening device of the moisture separation unit according to the fourth embodiment. FIG. 11 is a vertical sectional view perpendicular to the channel direction of one unit of the droplet diameter coarsening device of the moisture separation unit according to the fourth embodiment.

  This embodiment has a bent rhombus tube 13a. On the tube wall 13b of the bent rhombus tube 13a, a curved surface that is convex toward the center of the flow path is formed. In the vicinity of the entrance of the bent rhombus channel 13c inside the bent rhombus 13a, wires 15 as obstacles are provided horizontally and vertically between the joints facing each other.

  By adopting such a configuration, the distance between the curved surfaces facing each other and the distance between the wire 15 and the curved surface are shortened, and the cohesive force easily acts between the liquid films attached to the curved surface. This makes it easy for the liquid films to merge. As a result, more droplets can be collected.

  Further, by stacking the plurality of bent rhombus tubes 13a, a gap is generated between the tube walls 13b of the bent rhombus tubes 13a adjacent to each other. Since this gap has a smaller cross-sectional area than that of the bent rhombus channel 13c, a liquid film can be easily formed and united in this gap without providing a wire. Can be obtained.

[Fifth Embodiment]
This embodiment is a modification of the first to fourth embodiments. That is, the moisture separation unit 2 according to the first to fourth embodiments is applied to a moisture separation heater.

  FIG. 12 is an elevational sectional view showing a configuration of a moisture separation heater to which the moisture separation unit according to the fifth embodiment is applied. A moisture separator heater (MSH) 40, which is an example of a steam dryer, is provided on a steam system path that guides steam from a high-pressure turbine (not shown) to a low-pressure turbine (not shown) in a power plant, A horizontal cylindrical main body container 41, a moisture separation unit 2 accommodated in the main body container 41, a first stage heater 42a and a second stage heater 42b are provided.

  At the bottom of the main body container 41, for example, two moisture separation units 2 are disposed to be inclined and opposed to each other, a first stage heater 42a is disposed above them, and a second stage heater 42b is further disposed above them. Is placed. Further, a drain channel 45 defined by a bottom plate 43 and a ceiling plate 44 is formed between the two moisture separation units 2.

  Inside the main body container 41, flow path partition plates 51, 52 a, 52 b are sequentially arranged from the lower heated steam inlet 47 to the upper heated steam outlet 48, and the moisture separation unit 2, first stage heating A passage for sequentially guiding the heated steams S0 and S1 is formed in the heater 42a and the second stage heater 42b. The drain channel 45 is isolated from the channel of the heated steam S0. A space surrounded by the flow path partition plate 51 and the flow path partition plate 52 a is communicated with the downstream side of the moisture separation unit 2. The space surrounded by the flow path partition plate 52a and the flow path partition plate 52b is communicated with the downstream side of the first stage heater 52a.

  The moisture separator / heater 40 thus configured guides the heated steam S0 flowing from the heated steam inlet 47 to the moisture separation unit 2, and the heated steam S1 separated by the moisture separation unit 2 from the moisture. Next, the steam S1 to be heated is guided to the heaters 42a and 42b, and the heating steam S2 is generated by heating with the heaters 42a and 42b. The generated heated steam S2 is supplied from the heated steam outlet 48 to the low pressure turbine.

  As shown in the above fifth embodiment, the moisture separation unit 2 according to the first to fourth embodiments can be applied to the moisture separation heater 40, and the first to fourth embodiments. There is an effect similar to the form.

[Other Embodiments]
As mentioned above, although several embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. Moreover, the laminated structure of the droplet diameter increasing device 10 may have an inclination as a whole.

  Moreover, you may combine the characteristic of each embodiment. Furthermore, these embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention.

  These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

  For example, the wire 15 may be provided so as to contact the inlet side end face of the rhombus 11a. Further, for example, the wire 15 may be attached to the position of the broken line shown in FIG. In this way, the wire 15 can be easily attached to the plurality of rhombus tubes 11a.

  At this time, if the rhombus 11 a is slightly cut along the wire 15, the positioning of the wire 15 can be improved and the wire 15 can be provided without protruding toward the end face side. Furthermore, if the rhombus 11a is divided into two in the axial direction in advance and the rhombus 11a is connected so that the wire 15 is sandwiched after the wire 15 is attached after being cut out as described above, the wire is inserted in the middle of the flow path. 15 can be provided easily.

  Further, the obstacle is not limited to the wire 15 and may be a thin rod or the like. If the droplet collides, it contributes to the coarsening of the droplet, and the material is not particularly limited. However, as described in each embodiment, when applied to a steam dryer or a moisture separator, it is exposed to a high-temperature environment for a long period of time.

  In addition, although demonstrated as what laminated | stacked the rhombus pipe | tube 11a, this is not limited to laminating | stacking and forming a tubular body. For example, a plurality of through holes are provided in a ceramic or metal plate so that a large number of tubular flow paths are stacked without any gaps.

  DESCRIPTION OF SYMBOLS 1 ... Steam dryer, 2 ... Moisture separation unit, 10 ... Droplet diameter coarsening apparatus, 11a ... Rhombus tube, 11b ... Tube wall, 11c ... Rhombus channel (tubular channel), 12a, 12b ... Triangular tube, 13a ... Bent rhombus, 13b ... Tube wall, 13c ... Bent rhombus (tubular channel), 14a, 14b, 14c, 14d ... Joint, 15 ... Wire (obstacle), 15a ... First layer wire (obstacle) Material), 15b ... second layer wire (obstacle), 15c ... X-shaped wire (obstacle), 16a ... inflow droplet, 16b ... minute droplet, 17 ... liquid film, 18 ... liquid pool, 20 ... vapor drying 21 ... Vane, 21a ... Vane pocket, 22 ... Zigzag flow path, 31 ... Exit side porous panel, 32 ... Drain treatment part, 33 ... Drain trough, 33a ... Drain hole, 34 ... Drain channel, 35 ... Food, 36 ... support plate, 37 ... open steam inlet 38, support member, 40 ... moisture separator heater (MSH), 41 ... main body container, 42a ... first stage heater, 42b ... second stage heater, 43 ... bottom plate, 44 ... ceiling plate, 45 ... Drain flow path, 47 ... heated steam inlet, 48 ... heated steam outlet, 51, 52a, 52b ... flow path partition plate

Claims (8)

In a moisture separation unit for removing droplets in wet steam containing droplets in the steam from the steam,
A plurality of collecting means for collecting the liquid droplets, and a steam drying section including a plurality of steam flow path forming members that form a steam flow path at least partially bent between each other;
A droplet diameter increasing device provided with an upstream inlet surface of the steam drying section, and having a plurality of tubular channels arranged in parallel to each other and extending from the inlet of the supplied wet steam to the steam drying section When,
Comprising
In the projection plane viewed from the axial direction of the tubular flow path, it has an obstacle crossing the tubular flow path,
Moisture separation unit characterized by that.   The moisture separation unit according to claim 1, wherein the tubular channel has a polygonal column shape.   2. The moisture separation unit according to claim 1, wherein the tubular channel has a shape in which a cross section perpendicular to the axial direction has a curved shape in which a polygonal side protrudes inward.   The moisture separation unit according to any one of claims 1 to 3, wherein the obstacle is provided in a plane perpendicular to the longitudinal direction.   The moisture separation unit according to any one of claims 1 to 4, wherein the obstacles are provided at regular intervals in the flow direction of the tubular channel.   The humidity according to any one of claims 1 to 5, wherein when the obstacle is seen through in the flow direction of the tubular channel, obstacles adjacent to each other in the flow direction are located at different positions. Separation unit. A droplet diameter coarsening device of a moisture separation unit for removing droplets in wet steam containing droplets in the steam from the steam,
An upstream inlet surface of the steam drying section provided with a plurality of collecting means for collecting the droplets and provided with a plurality of steam flow path forming members that form at least a partially bent steam flow path between them Provided in
Capturing the droplets from the wet steam to increase the diameter of the droplets, and having a plurality of tubular channels arranged in parallel to each other and extending from the inlet of the supplied wet steam to the steam drying unit A droplet diameter coarsening device;
Comprising
In the projection plane viewed from the axial direction of the tubular flow path, it has an obstacle crossing the tubular flow path,
A droplet diameter increasing device characterized by the above. In a steam dryer that receives wet steam containing droplets in the steam and separates the droplets in the steam,
A moisture separation unit for removing droplets in the vapor;
A drain processing unit for collecting and transferring the droplets that have been removed and dropped below the moisture separation unit;
With
The moisture separation unit comprises:
A plurality of collecting means for collecting the liquid droplets, and a steam drying section including a plurality of steam flow path forming members that form a steam flow path at least partially bent between each other;
A droplet diameter increasing device provided with an upstream inlet surface of the steam drying section, and having a plurality of tubular channels arranged in parallel to each other and extending from the inlet of the supplied wet steam to the steam drying section When,
Comprising
In the projection plane viewed from the axial direction of the tubular flow path, it has an obstacle crossing the tubular flow path,
A steam dryer characterized by that.

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