JP2006200789A - Heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heater capable of miniaturizing a building even when reheat cycle is applied. <P>SOLUTION: A heater body 12 has a plurality of heat transfer tubes through which heated steam passes, as a tube bundle 14, and a shell 11 for storing the heater body 12 is mounted in piping of a main steam system. An annular-shaped supporting plate 17a and a disc-shaped supporting plate 17b support the tube bundle 14 of the heater body 12, and the heated steam flowing in the piping of the main steam system is circulated in the axial direction of the piping while exchanging the heat with the heater body 12. Thus, the heater can be miniaturized. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a heater that heats steam flowing into a steam turbine to a superheated region.

  For example, in a boiling water nuclear power plant (BWR power plant), steam generated in a nuclear reactor is guided to a high-pressure turbine, steam finished at the high-pressure turbine is guided to an intermediate-pressure turbine, and work is finished at an intermediate-pressure turbine. However, unlike ordinary thermal power plants, the steam that has finished work in the high-pressure turbine is directly recirculated to the medium-pressure turbine without reheating (for example, Patent Documents). 1). On the other hand, in the improved boiling water nuclear power plant (ABWR power plant), a moisture separation heater is installed, and the steam that has finished work in the high pressure turbine is reheated by the moisture separation heater and led to the intermediate pressure turbine. (For example, refer to Patent Document 2). That is, the BWR power plant is basically a non-reheat cycle, and the ABWR power plant is a reheat cycle.

  In an ABWR power plant that is a reheat cycle, the steam flowing into the high-pressure turbine is almost saturated, so the exhaust steam of the high-pressure turbine becomes wet steam. Therefore, after the moisture is removed from the vapor state by the moisture separation heater, the temperature of the vapor is raised to the superheated region.

Similarly, it is considered that the BWR power plant can be reheat cycled to increase the output and improve the efficiency of the BWR power plant, and it is considered to recycle the existing BWR power plant. Yes.
JP 05-297187 A JP 2002-357104 A

  However, in order to realize the reheating cycle, it is necessary to install a moisture separation heater, and it is necessary to secure a space for installing the moisture separation heater in the building. The moisture separator heater is a huge heat exchanger following the condenser among heat exchangers installed in a power plant. The moisture separator heater has multiple main steam pipes and also passes through a moisture separator installed in the moisture separator heater to increase the efficiency of moisture separation in the exhaust steam stream. Since the steam flow rate to be greatly reduced is necessary, the container becomes huge.

  This is one of the factors that increase the size of the building. In addition, the installation space of the existing building is expanded in order to install the existing BWR power plant by adding the moisture separation heater used in the ABWR power plant. In addition, it is necessary to secure a route for carrying in the equipment, and the generated remodeling cost becomes enormous. As described above, when the conventional moisture separator / heater is used, it is very difficult to downsize the building of the newly planned power plant or recycle the existing power plant. In other words, it is one of the important plans to secure an installation space in the building for installing the moisture separation heater when planning a power plant for a reheat cycle.

  An object of the present invention is to provide a heater that can reduce the size of a building even if it is reheat cycled.

  The heater of the present invention includes a heater body having a plurality of heat transfer tubes through which heating steam passes as a tube bundle, a shell provided in a main steam system pipe and housing the heater body, and a tube bundle of the heater body. And a support plate that circulates the heated steam flowing through the main steam system pipe in the axial direction of the pipe while exchanging heat with the main body of the heater, and the support plate extends in the flow-down direction of the heated steam. It is composed of two kinds of support plates arranged alternately at appropriate intervals, and one support plate is an annular plate having a size such that the outer peripheral portion is in contact with the inner surface of the shell and having a hole in the center portion. The other support plate is a disk-shaped plate having an outer peripheral portion substantially equal in size to the outer peripheral portion of the tube bundle and having no hole in the central portion.

  According to the present invention, the shell containing the heater body having a plurality of heat transfer tubes through which the heating steam passes as a tube bundle is provided in the main steam system pipe, and the support plate for supporting the tube bundle of the heater body is the main plate. Since it is a heater of the structure which distribute | circulates the to-be-heated steam which flows through piping of a vapor | steam system to the axial direction of piping, exchanging heat with a heater main body, compactization can be achieved.

  In addition, when installed in the building of an existing power plant, the heater is compact, so there is no need to install and restore new openings, minimizing removal and restoration of obstacles in the carry-in route Or it can be eliminated.

(First embodiment)
FIG. 1 is a configuration diagram of a heater according to a first embodiment of the present invention, in which FIG. 1 (a) is a longitudinal sectional view and FIG. 1 (b) is a transverse sectional view. A heater body 12 having a length over the entire length of the shell 11 is provided in the cylindrical shell 11. Pipes of the main steam system, for example, a cross-around pipe 18 are connected to both ends of the shell 11. Steam to be heated flows into the shell 11 from one cross-around pipe 18-1 as indicated by an arrow A, and after exchanging heat with the heater body 12, is discharged from the other cross-around pipe 18-2. It has become.

  The heater body 12 has a plurality of straight heat transfer tubes through which heated steam passes, and is formed as a tube bundle 14 by attaching headers 13 to both ends of the heat transfer tubes. The heating steam is supplied from the heating steam inlet pipe 15 to the header 13 positioned downstream in the flow direction of the heated steam as indicated by the arrow B, and after exchanging heat with the heated steam through the pipe bundle 14, the upstream is upstream. It is discharged from the heated steam outlet pipe 16 via the header 13 located.

  By the way, the heater body 12 is supported by two types of support plates 17a and 17b that are alternately arranged in the shell 11 with a predetermined dimension in the flow direction of the steam to be heated.

  One support plate 17a has a hole in the center and is formed in an annular shape that is closely fixed to the inner peripheral surface of the shell 11 at the outer peripheral edge, and the other support plate 17b does not have a hole in the center and has an outer peripheral edge. Is formed in a disk shape having a dimension equivalent to the outer diameter of the tube bundle 14.

  The disc-shaped support plate 17b without a hole has a space between it and the shell 11, and fluid on the shell 11 side can pass through this space. On the other hand, the annular support plate 17a allows the fluid on the shell 11 side to pass in the longitudinal direction of the shell 11 from the space between the heat transfer tubes arranged at the positions with the holes. Yes.

  Accordingly, the steam A to be heated flows into the shell 11 from the cross-around pipe 18-1 located on the left side in the drawing, passes through the space between the heater body 12 and the shell 11 by the header 13 of the heater body 12, The direction is changed in the direction of the center of the tube bundle 14 by the annular support plate 17 a and flows into the tube bundle 14. The heated steam A that has passed through the annular support plate 17a flows in a radial direction by the disk-type support plate 17b without holes, and passes while contacting the heat transfer tube at an angle close to perpendicular. In this way, the annular support plate 17a and the disk support plate 17b are arranged so that the heated steam A flowing inside the shell 11 has a flow component perpendicular to the heat transfer tubes of the tube bundle 14, and the shell 11 as a whole. Circulate in the axial direction. While being repeated, the heated steam rises in temperature while flowing in the tube bundle 14, and is discharged from the other cross-around tube 18-2. On the other hand, the heated steam B flows from the heated steam inlet pipe 15 downstream of the heated steam A of the tube bundle 14 and is cooled and condensed by the heated steam passing through the shell 11 side while flowing through the heat transfer pipe. It flows while increasing the ratio of condensed drain.

  According to the first embodiment, the heater main body 12 is installed in the shell 11 that can be connected to the main steam pipe, and the heated steam is heated while flowing in the longitudinal direction of the shell 11, so that a reheat cycle is possible. Thus, a small heater can be achieved, and plant output can be increased and plant efficiency can be improved.

(Second Embodiment) (Corresponding to Claim 3)
FIG. 2 is a block diagram of a heater according to the second embodiment of the present invention, in which FIG. 2 (a) is a longitudinal sectional view, FIG. 2 (b) is a transverse sectional view, and FIG. It is a longitudinal cross-sectional view of an example. This second embodiment is different from the first embodiment shown in FIG. 1 in that the arrangement shape of the plurality of heat transfer tubes in the tube bundle is any one of a polygonal shape, a cylindrical shape, and a columnar shape. Formed. The same elements as those in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.

  The tube arrangement of the plurality of heat transfer tubes of the tube bundle 14 is configured by arranging a plurality of heat transfer tubes in a cylindrical tube bundle 14a as shown in FIG. Alternatively, as shown in FIG. 2 (c), a plurality of heat transfer tubes are arranged in a polygon to form one polygonal tube bundle 14b, and the plurality of polygonal tube bundles 14b are arranged in a cylindrical shape. Composed. In that case, a short path prevention plate 19 is provided between each of the tube bundles 14b to prevent the heated steam from short-passing between the tube bundles 14b and 14b. Then, as shown in FIG. 2B, the cylindrical or cylindrical tube bundle 14 is arranged at a position where the central axis coincides with the trunk axis of the shell 11.

  The tube bundle 14 is supported by circular support plates 17a with holes and disc support plates 17b without holes, which are alternately arranged in the flow direction of the heated steam. A space is formed between the annular support plates 17a and the inner periphery of the shell 11 and the outer periphery of the tube bundle 14a, and the steam to be heated flows through the space and the central space where the heat transfer tubes are not arranged. On the other hand, the disk-shaped support plate 17b changes the direction of the flow of the steam to be heated in the vertical direction, and the space between the above-described ring-shaped support plates 17a and the inner periphery of the shell 11 and the outer periphery of the tube bundle 14a, The heated steam is guided to the central space which is not arranged.

  The steam A to be heated flows into the shell 11 from the cross-around pipe 18, is guided toward the center of the tube bundle 14 by the annular support plate 17 a, and flows into the space in the tube bundle 14. The heated steam A that has passed through the annular support plate 17a is changed in the direction of flow in the disk support plate 17b to a radial direction and is guided in a direction orthogonal to the heat transfer tube. Accordingly, when the heated steam A passes through the tube bundle 14, it passes at an angle close to perpendicular to the heat transfer tubes of the tube bundle 14, and passes through the hole of the annular support plate 17 a, or the annular support plate 17 a and the shell 11. And flows in the axial direction of the shell 11. While repeating this, the temperature rises while flowing in the tube bundle 14.

  On the other hand, the heating steam flows from the heating steam inlet 15 on the downstream side of the steam to be heated in the tube bundle 14 and is cooled and condensed by the steam to be heated passing through the shell 11 side while flowing in the heat transfer pipe of the tube bundle 14. It flows while increasing the ratio of condensed drain.

  According to the second embodiment, since the tube bundle 14 is not arranged in the hole portion of the annular support plate 17a, the interval between the annular support plates 17a can be increased. Therefore, the excitation force associated with the passage of heated steam through the tube bundle 14 can be suppressed, and vibration can be prevented. Further, in the first embodiment in which the straight pipes are arranged at positions where the holes of the annular support plate 17a are located, there is heated steam that flows parallel to the heat transfer pipes, but in the second embodiment, Since the tube bundle 14 is not arranged in the hole portion of the annular support plate 17a, the heated steam flowing in parallel with the heat transfer tube is eliminated, the heat exchange efficiency can be improved, and the flow rate of the heated steam is adjusted. Can do. Therefore, it is possible to obtain a heater that supplies steam having an appropriate pressure and temperature that optimizes the low-pressure turbine performance, and the effects of increasing plant output and improving plant efficiency are obtained.

(Third embodiment)
FIG. 3 is a block diagram showing an example of a heater according to the third embodiment of the present invention, in which FIG. 3 (a) is a longitudinal sectional view and FIG. 3 (b) is a transverse sectional view. The third embodiment uses a plurality of U-shaped tubes as a plurality of heat transfer tubes of the heater body 12 with respect to the first embodiment shown in FIG. 1, and one end of the plurality of U-shaped tubes. A header is attached to the part to form a tube bundle. The same elements as those in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.

  In FIG. 3, a 2-pass tube bundle 14 is configured using a U-shaped tube 20 as a heat transfer tube of the heater body 12. A header 13 is attached to one end of the U-shaped tube to form a tube bundle. The header 13 is provided on the inlet side of the steam to be heated. At that time, the header 13 is partitioned by the partition plate 21 to be divided into headers 13a and 13b, the heating steam inlet pipe 15 is connected to the header 13a, and the heating steam outlet pipe 16 is connected to the header 13b. Since the header 13 is provided at one end of the U-shaped tube, the thermal expansion of the heat transfer tubes of the tube bundle 14 is not restricted.

  4A and 4B are configuration diagrams showing another example of the heater according to the third embodiment of the present invention. FIG. 4A is a longitudinal sectional view, and FIG. 4B is a transverse sectional view. In another example, the header 13 is provided on the outlet side of the heated steam as compared with the example shown in FIG. The same elements as those in FIG. 3 are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 4, a header 13 is provided on the outlet side of the steam to be heated, the header 13 is partitioned by a partition plate 21, and is divided into headers 13a and 13b. A heating steam inlet pipe 15 is connected to the header 13a. A heating steam outlet pipe 16 is connected to 13b. Thereby, it becomes possible not to restrain the heat | fever elongation of the heat exchanger tube by heating steam, and generation | occurrence | production of the thermal stress by this can be prevented.

  FIG. 5 is a block diagram showing another example of a heater according to the third embodiment of the present invention, in which FIG. 5 (a) is a longitudinal sectional view and FIG. 5 (b) is a transverse sectional view. is there. In another example, a plurality of U-shaped tubes are provided in the example shown in FIG. 3, and a plurality of heat transfer tubes are arranged in a polygon to form one polygonal tube bundle 14b. The plurality of tube bundles 14b are arranged in a cylindrical shape. The same elements as those in FIG. 3 are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIG. 5, a plurality of tube bundles 14b are arranged in a polygonal shape, and a short path prevention plate 19 for preventing heated steam from short-passing between the tube bundle 14b and the tube bundle 14b is installed on the side of the tube bundle. Thus, one tube bundle 14b can be made into a small plurality of tube bundles, and one tube bundle 14b can be made small. Thereby, manufacturability and importability can be improved.

  According to the third embodiment, since the header 13 is provided at one end of the U-shaped tube, the thermal expansion of the heat transfer tube of the tube bundle 14 is not constrained, so that generation of thermal stress can be prevented.

(Fourth embodiment)
6A and 6B are configuration diagrams of a heater according to the fourth embodiment of the present invention. FIG. 6A is a longitudinal sectional view, and FIG. 6B is a view of FIG. FIG. In the fourth embodiment, in contrast to the third embodiment shown in FIG. 3, the inside of the header is partitioned by a partition plate 21, and the flow of heated steam is made into multiple passes. The same elements as those in FIG. 3 are denoted by the same reference numerals, and redundant description is omitted.

  6A, the space inside the header 13 is divided by a horizontal partition plate 21a and a vertical partition plate 21b. In FIG. 6A, the header 13 is partitioned into three sections. Is shown. Of the headers 13a, 13b, and 13c partitioned into three sections by the partition plates 21a and 21b, the heating steam inlet pipe 15 is connected to the lower left header 13a in FIG. 6A, and the lower right in FIG. The heating steam outlet pipe 16 is connected to the header 13b. When the heating steam flows into the header 13a from the heating steam inlet 15, the heating steam flows from the tube bundle 14-1 located in the header 13a through the U-shaped tube 20 and further into the header 13c through the tube bundle 14-2. The heated steam that has flowed into the header 13c passes through the tube bundle 14-3, passes through the U-shaped tube 20, passes through the tube bundle 14-4 positioned in the header 13b, and is discharged from the heated steam outlet tube 16 of the header 13b. In this way, the heated steam reciprocates the U-tube bundle 14 twice.

  In this case, the condensate generated when flowing out into the header 13c remains in the header 13c, and only the heating steam flows into the next tube bundle 14, so that the condensate flowing in the heat transfer tubes of the tube bundle 14 can be reduced. it can. Therefore, it is possible to prevent the heat transfer tube from being blocked with condensate, and to adjust the length of the tube bundle 14 and the pressure and temperature of the steam to be heated.

  Steam to be heated flows into the shell 11 from the cross-around pipe 18 and flows into the tube bundle 14 through the space between the header 13 and the shell 11. The steam to be heated passes through the annular support plate 17a at an angle close to the vertical to the heat transfer tubes of the tube bundle 14, and when passing through the disc type support plate 17b, passes through an angle close to the heat transfer tubes. On the other hand, when passing through the annular support plate 17a or passing through the space formed by the annular support plate 17a and the shell 11, the flow flows in the axial direction of the shell 11. While repeating this, the temperature rises while flowing in the tube bundle.

  According to the fourth embodiment, since the internal space of the header 13 is partitioned by the partition plate 21, the flow of the heating steam can be made into multiple passes. Further, the steam property at the heat transfer tube outlet of the heated steam flowing in the heat transfer tube of the tube bundle 14 can be adjusted, and the heater can be shortened because the heated steam can be reciprocated twice.

(Fifth embodiment)
7A and 7B are configuration diagrams of a heater according to the fifth embodiment of the present invention, in which FIG. 7A is a cross-sectional view, FIG. 7B is a cross-sectional view showing an example of a support plate, and FIG. (C) is a longitudinal sectional view showing an example of a support plate, FIG. 7 (d) is a transverse sectional view showing another example of the support plate, and FIG. 7 (e) is a longitudinal sectional view showing another example of the support plate. is there. This fifth embodiment is different from the third embodiment shown in FIG. 3 in that the support plate 17c of the tube bundle 14 is a strip plate with an outer ring instead of the annular support plate 17a and the disc support plate 17b. It is composed of The same elements as those in FIG. 3 are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIGS. 7B and 7C, the support plate 17c is formed of a disk-shaped strip plate 22 and an outer ring portion 23, and the strip plate 22 has a plurality of strip plates arranged in the vertical and horizontal directions. And has a plurality of lattices and is formed in a disk shape. And a heat exchanger tube is supported through a heat exchanger tube in the lattice formed with a plurality of strips. The outer ring portion 23 is provided on the outer periphery of the strip plate 22 and is attached to the shell 11.

  That is, the support plate 17c supports the heat transfer tube in a space surrounded by a strip plate constituted by a plurality of strip plates in accordance with the tube arrangement. A cylindrical or disk-shaped outer ring portion 23 is attached to the outer periphery of the strip plate 22 formed of a band plate. The attached outer ring portion 23 is attached to the shell 11 and prevents the heated steam from passing through the space between the shell 11 and the tube bundle 14 and the short passage through the reinforcement of the strip plate 22.

  FIGS. 7 (d) and 7 (e) are explanatory views of another example of the support plate 17c. The outer ring portion 23 is a strip plate 22 compared to the support plate 17c shown in FIGS. 7 (b) and 7 (c). It is attached by shifting with respect to.

  According to the fifth embodiment, the steam to be heated can flow only in the axial direction of the shell 11 of the tube bundle 14, and the pressure loss when the steam to be heated passes through the tube bundle 14 can be reduced. Therefore, heated steam having a high pressure can be provided to the low-pressure turbine, and the plant output can be increased and the plant efficiency can be improved.

(Sixth embodiment)
FIG. 8 is a block diagram of a heater according to the sixth embodiment of the present invention. In the sixth embodiment, in contrast to the fifth embodiment shown in FIG. 7, a baffle plate is attached in the vicinity of the U bend portion of the U-shaped tube to block the flow of heated steam into the U bend portion. It is what I did. The same elements as those in FIG.

  As shown in FIG. 8, a baffle plate 24 is attached in the vicinity of the bend start portion and the end portion of the U bend portion of the U-shaped tube 20. Accordingly, the steam to be heated is blocked by the baffle plate 24 from flowing into the U-bend portion, so that it passes through the tube bundle 14.

  According to the sixth embodiment, the baffle plate 24 prevents the heated steam from flowing to the U bend portion of the U-shaped tube 20, so that the flow of the heated vapor in the U bend portion is blocked, and the U bend portion It is possible to prevent vibration due to the flow of heated steam.

(Seventh embodiment)
FIG. 9 is a block diagram of a heater according to the seventh embodiment of the present invention. In the seventh embodiment, a flow guide plate for steam to be heated is attached to the U-bend portion of the U-shaped tube as compared with the fifth embodiment shown in FIG. The same elements as those in FIG.

  As shown in FIG. 9, a flow guide plate 25 for steam to be heated is attached to the U bend portion of the U-shaped tube 20. The flow guide plate 25 has a V-shaped cross section and guides the steam to be heated so as to flow away from the top of the U bend portion of the U-shaped tube 20. Thus, the steam to be heated does not flow into the U bend portion surrounded by the flow guide plate 25 and passes through the tube bundle 14.

  According to the seventh embodiment, the amount of steam to be heated flowing to the U bend part can be limited, and therefore vibration due to the steam to be heated in the U bend part can be mitigated. In addition, the heated steam flowing out from the tube bundle 14 can be flowed smoothly by the flow guide plate 25, and the pressure loss of the heated steam can be reduced. Therefore, heated steam having a high pressure can be provided to the low-pressure turbine, and the plant output can be increased and the plant efficiency can be improved.

  Next, the arrangement of the heaters in each of the embodiments described above will be described. FIG. 10 is an explanatory diagram of the connection relationship between the heater 26 and the cross-around pipes 18-1 and 18-2. The central axis of the shell 11 of the heater 26 and the central axes of the cross-around pipes 18-1 and 18-2 are arranged in parallel. As a result, it is possible to simplify the arrangement plan of a new plant pipe or an arrangement plan to an existing plant.

  Moreover, as shown in FIG. 11, it is also possible to arrange | position the center axis | shaft of the shell 11 of the heater 26, and the center axis | shaft of the cross-around pipes 18-1 and 18-2 in the direction which is not parallel. FIG. 11A is an explanatory diagram of an example in which the central axis of the shell 11 of the heater 26 and the central axis of the cross-around pipe 18-1 are positioned in a non-parallel direction. You may make it arrange | position in the direction which is not parallel on both sides, changing to the direction which is not parallel on one side. Moreover, as shown in FIG.11 (b), it is good also as a structure by which the header 13 is arrange | positioned outside the cross-around pipe | tube 18-1. Thereby, various means can be provided for the arrangement plan of a new plant pipe or an arrangement plan for an existing plant. Moreover, the connection structure of the header 13 and the heating steam pipe is simplified, and the maintainability of the header 13, the heating steam inlet 15 and the heating steam outlet 16 can be improved.

  In addition, since the heater 26 is disposed in the opening after the intermediate combined valve (ICV) is removed, the outer diameter of the heater 26 is smaller than the opening after the intermediate combined valve (ICV) is removed. Form. It becomes possible to carry in ICV from the opening part after removal. In addition, the equipment constituting the heater 26 is divided and carried into the plant building and assembled on site. As a result, it is possible to assemble on-site, and it becomes easy to carry in and assemble the heater.

The block diagram of the heater concerning the 1st Embodiment of this invention. The block diagram of the heater concerning the 2nd Embodiment of this invention. The block diagram which shows an example of the heater concerning the 3rd Embodiment of this invention. The block diagram which shows another example of the heater concerning the 3rd Embodiment of this invention. The block diagram which shows another another example of the heater concerning the 3rd Embodiment of this invention. The block diagram of the heater concerning the 4th Embodiment of this invention. The block diagram of the heater concerning the 5th Embodiment of this invention. The block diagram of the heater concerning the 6th Embodiment of this invention. The block diagram of the heater concerning the 7th Embodiment of this invention. Explanatory drawing of an example of the connection relation of a heater and a cross-around pipe | tube. Explanatory drawing of another example of the connection relation of a heater and a cross-around pipe | tube.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Shell, 12 ... Heater main body, 13 ... Header, 14 ... Tube bundle, 15 ... Heating steam inlet pipe, 16 ... Heating steam outlet pipe, 17 ... Supporting plate, 18-1, 18-2 ... Cross-around pipe, 19 ... Short path prevention plate, 20 ... U-shaped tube, 21 ... Partition plate, 22 ... Strip plate, 23 ... Outer ring portion, 24 ... Baffle plate, 25 ... Flow guide plate, 26 ... Heater

Claims (9)

  A heater body having a plurality of heat transfer tubes through which the heating steam passes as a tube bundle, a shell provided in piping of a main steam system and housing the heater body, and supporting the tube bundle of the heater body and the main steam A support plate that circulates the heated steam flowing through the piping of the system in the axial direction of the piping while exchanging heat with the heater body, and the support plates are alternately spaced at appropriate intervals in the flow-down direction of the heated steam. It is composed of two types of support plates arranged, one support plate is an annular plate having a size such that the outer peripheral portion is in contact with the inner surface of the shell and having a hole in the center portion, and the other support plate is an outer periphery The heater is characterized in that the portion is a disk-shaped plate having substantially the same size as the outer peripheral portion of the tube bundle and having no hole in the central portion.   The heater body uses a plurality of straight tubes as a plurality of heat transfer tubes, and is formed as a tube bundle by attaching headers to both ends of the plurality of straight tubes, and the tube bundle is installed in parallel with the longitudinal axis of the shell. The heater according to claim 1.   The heater according to claim 1 or 2, wherein the tube bundle is formed such that an array shape of the plurality of heat transfer tubes is any one of a polygonal shape, a cylindrical shape, and a columnar shape.   The heater body uses a plurality of U-shaped tubes as a plurality of heat transfer tubes, a header is attached to the ends of the plurality of U-shaped tubes, and is formed as a tube bundle. The heater according to claim 1 or 3, wherein the heater is installed in parallel with the direction axis.   The heater according to any one of claims 2 to 4, wherein the inside of the header is partitioned by a partition plate, and the flow of the heating steam is made into multiple passes.   The heater according to any one of claims 1 to 5, wherein the support plate is arranged so that the steam to be heated flowing inside the shell has a flow component perpendicular to the heat transfer tubes of the tube bundle. .   A heater body having a plurality of heat transfer tubes through which the heating steam passes as a tube bundle, a shell provided in piping of a main steam system and housing the heater body, and supporting the tube bundle of the heater body and the main steam A support plate that circulates the heated steam flowing through the piping of the system in the axial direction of the piping while exchanging heat with the main body of the heater, and the support plate has a plurality of grids arranged in a vertical and horizontal direction. A heater having an outer ring portion attached to the shell on an outer periphery thereof, and a disk-shaped strip plate having a shape of the plate, and supporting the heat transfer tube through the heat transfer tube through the lattice.   8. A baffle plate is attached in the vicinity of a bend start portion and an end portion of a U bend portion of the U-shaped tube to block the flow of heated steam into the U bend portion. The heater described.   The heater according to any one of claims 4 to 7, wherein a flow guide plate for steam to be heated is attached to a U bend portion of the U-shaped tube.

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