Steam condenser

Abstract

To suppress stains in a heat transfer pipe without discharging the steam containing foreign substance into the ambient air.SOLUTION: A steam condenser includes: a heat transfer pipe group; an in-body bypass pipe; a pipe group protection member which allows steam to pass through while preventing a foreign substance from passing through; and a body covering the above. The body includes: a steam inlet into which steam from the steam turbine flows; a steam port opposite panel; and a plurality of side panels. The plurality of side panels include a first side panel and a second side panel that face each other in a first side direction perpendicular to a main steam inflow direction. The in-body bypass pipe is arranged between the steam inlet and the heat transfer pipe group. The in-body bypass pipe includes a plurality of first jet holes which can jet steam on the side of the first side panel. The pipe group protection member is provided in a deployment region including a first side deployment region which stretches between the heat transfer pipe group and the first side panel.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a condenser capable of condensing steam. [Background technology]

[0002] A steam turbine plant generally includes a boiler, a steam turbine driven by steam from the boiler, a condenser that converts steam exhausted from the steam turbine back into water, various pumps such as a condensate pump and a feedwater pump, a main steam line that conducts steam generated in the boiler to the steam turbine, a steam stop valve provided in the main steam line, a water line that conducts water in the condenser to the boiler via the condensate pump and feedwater pump, a bypass line that branches off from a position on the boiler side of the steam stop valve in the main steam line and is connected to the condenser, and a bypass valve provided in the bypass line.

[0003] After construction or repair of a steam turbine plant, foreign matter such as welding slag and grinding chips remains in the piping and various equipment. For this reason, in such steam turbine plants, blowing out (or flushing) is performed to remove the foreign matter after construction or repair.

[0004] A cleaning method for a steam turbine plant is disclosed in, for example, Patent Document 1 below.

[0005] In the cleaning method disclosed in Patent Document 1, a temporary pipe is installed prior to performing blowing out. One end of this temporary pipe is connected to a bypass valve, and the other end of the temporary pipe is connected to a discharge pipe via various lines. Next, steam is generated in the boiler, and this steam is released into the atmosphere from the discharge pipe via the main steam line, bypass line, bypass valve, temporary pipe, and various lines. That is, in this blowing out, the steam generated in the boiler is released into the atmosphere via the temporary pipe or the like without flowing into the steam turbine, thereby releasing any foreign matter remaining in the pipe into the atmosphere along with the steam.

[0006] A condenser generally includes a heat transfer tube bank consisting of a plurality of heat transfer tubes and a shell that covers the heat transfer tube bank. The shell has a steam port through which steam exhausted from a steam turbine can flow.

[0007] This condenser is disclosed in, for example, Patent Document 2 below.

[0008] The condenser disclosed in Patent Document 2 includes a plurality of dummy rods in addition to the aforementioned heat transfer tube bank and shell. The plurality of dummy rods are arranged at intervals around the heat transfer tube bank within the shell. Steam flowing into the condenser from a steam turbine may contain water droplets. The plurality of dummy rods serve to prevent water droplets contained in the steam from the steam port of the shell from directly impinging on the plurality of heat transfer tubes that make up the heat transfer tube bank, thereby suppressing erosion of the plurality of heat transfer tubes. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-089656 [Patent Document 2] International Publication No. 2014 / 057901 Summary of the Invention [Problem to be solved by the invention]

[0010] In recent years, from the viewpoint of environmental issues, etc., it is undesirable to release steam containing foreign matter into the atmosphere. Furthermore, it is preferable to avoid, as much as possible, the plurality of heat transfer tubes constituting the heat transfer tube group from being soiled with foreign matter or being damaged by foreign matter.

[0011] Therefore, an object of the present disclosure is to provide a condenser that can prevent steam containing foreign matter from being released into the atmosphere and can prevent heat transfer tubes from being soiled or damaged. [Means for solving the problem]

[0012] In order to achieve the above object, a condenser according to one aspect of the invention comprises: The steam turbine comprises one or more heat transfer tube groups each composed of a plurality of heat transfer tubes, an internal bypass pipe through which steam can flow in from the outside without passing through a steam turbine, a tube group protection member that allows steam to pass through while preventing the passage of foreign matter, and a shell that covers the one or more heat transfer tube groups, the tube group protection member, and the internal bypass pipe. The shell has a steam port through which steam exhausted from the steam turbine can flow in, a steam port facing plate that is located on the opposite side of the steam port with respect to the one or more heat transfer tube groups, and a plurality of side plates extending from the steam port to the steam port facing plate. The plurality of side plates include a first side plate and a second side plate that face each other in a first lateral direction having a directional component perpendicular to a main steam inflow direction, which is a direction in which the steam port facing plate is located relative to the steam port. The internal bypass pipe is disposed between the steam port and the one or more heat transfer tube groups in the main steam inflow direction, and extends in a second lateral direction having directional components perpendicular to both the main steam inflow direction and the first lateral direction, and is connected to the shell. The intra-shell bypass pipe is formed with a plurality of ejection holes that can eject steam inside the intra-shell bypass pipe toward at least one of the first side plate side and the second side plate side, within the shell. The tube bank protection member is arranged in a deployment region that includes at least a side deployment region that expands in the main steam inflow direction and the second side direction, between the one or more heat transfer tube groups and one of the first side plate and the second side plate that ejects steam from the one or more heat transfer tube groups.

[0013] In this embodiment, the steam containing the foreign matter flows into the internal bypass pipe and is then ejected from the internal bypass pipe into the shell of the condenser, thereby preventing the steam containing the foreign matter from being released into the atmosphere. In this aspect, the steam that has flowed into the intra-shell bypass pipe is ejected from the multiple ejection holes onto at least one of the first side plate side and the second side plate side within the shell. Therefore, in this aspect, the amount of foreign matter that travels directly from the intra-shell bypass pipe toward one or more heat transfer tube groups can be reduced. Therefore, in this aspect, it is possible to prevent foreign matter contained in the steam ejected from the intra-shell bypass pipe from contaminating or damaging the multiple heat transfer tube groups that respectively constitute the one or more heat transfer tube groups.

[0014] Foreign matter contained in the steam ejected toward the one side plate collides with the one side plate, and most of the foreign matter moves toward the one or more heat transfer tube bundles. The foreign matter collides with the tube bundle protection member arranged in the side deployment region between the one side plate and the one or more heat transfer tube bundles. Therefore, in this aspect, it is possible to prevent foreign matter contained in the steam ejected toward the one side plate from soiling or damaging the multiple heat transfer tube bundles that make up each of the one or more heat transfer tube bundles. [Effects of the Invention]

[0015] According to the condenser of one aspect of the present disclosure, steam containing foreign matter is not released into the atmosphere, and contamination or damage to heat transfer tubes can be suppressed. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a system diagram of a plant according to a first embodiment of the present disclosure. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Figure 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. [Figure 4] FIG. 2 is a cross-sectional view of a condenser in the first embodiment according to the present disclosure. [Figure 5] FIG. 10 is an explanatory diagram showing the arrangement of dummy rods within a deployment area in the first embodiment of the present disclosure. [Figure 6] FIG. 4 is a cross-sectional view of a condenser in a second embodiment according to the present disclosure. [Figure 7]FIG. 10 is an explanatory diagram showing the arrangement of dummy rods within a deployment area in a second embodiment according to the present disclosure. [Figure 8] FIG. 10 is a system diagram of a plant according to a third embodiment of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, various embodiments of a condenser according to the present disclosure and modified examples of a steam turbine plant including a condenser will be described with reference to the drawings.

[0018] "First embodiment of condenser" As shown in FIG. 1, the condenser of this embodiment is also provided in a plant equipped with a steam turbine.

[0019] In addition to the steam turbine 2, this plant includes a boiler 1, a main steam line 3, a main steam valve 4, a bypass line 5, a bypass valve 6, a feedwater line 7, a feedwater pump 8, and a condenser 10.

[0020] The steam turbine 2 has a turbine rotor 2r that can rotate about the axis A, and a turbine casing 2c that covers the turbine rotor 2r. For example, a rotor of a generator GEN is connected to one end of the turbine rotor 2r. A steam inlet 2i and a steam exhaust port 2o are formed in the turbine casing 2c. The steam inlet 2i is formed in the turbine casing 2c on an axial upstream side Dau, which is one side of the axial direction Da in which the axis A extends. The steam exhaust port 2o is formed in the turbine casing 2c on an axial downstream side Dad, which is the other side of the axial direction Da. This steam exhaust port 2o opens from inside the turbine casing 2c toward the axial downstream side Dad. Therefore, this steam turbine 2 is an axial flow exhaust type steam turbine 2.

[0021] The main steam line 3 connects the boiler 1 and the steam turbine 2 so that steam generated in the boiler 1 can be guided to the steam turbine 2. A main steam valve 4 is provided in this main steam line 3. A bypass line 5 is a line branching off from the main steam line 3. This bypass line 5 connects a position in the main steam line 3 that is closer to the boiler 1 than the main steam valve 4 to the condenser 10 so that steam flowing through the main steam line 3 can be guided to the condenser 10. A bypass valve 6 is provided in this bypass line 5.

[0022] The steam turbine 2 is driven by steam from the boiler 1. The condenser 10 converts the steam exhausted from the steam turbine 2 back into water. A feedwater line 7 connects the condenser 10 to the boiler 1 so that the water in the condenser 10 can be introduced to the boiler 1. A feedwater pump 8 is provided on this feedwater line 7.

[0023] From the time when the boiler 1 starts generating steam until the temperature and pressure of this steam meet the steam supply conditions to the steam turbine 2, the steam from the boiler 1 is sent to the condenser 10 via part of the main steam line 3 and the bypass line 5.

[0024] As shown in FIGS. 1 and 2 , the condenser 10 has a plurality of heat transfer tube groups 11, an in-shell bypass pipe 14, a tube group protection member 15, a plurality of water receiving trays 19, and a shell 20. Each of the plurality of heat transfer tube groups 11 is composed of a plurality of heat transfer tubes 12. The in-shell bypass pipe 14 is connected to a bypass line 5, and allows steam to flow in from the outside without passing through the steam turbine 2. The tube group protection member 15 allows steam to pass through while preventing the passage of foreign matter. The water receiving tray 19 can receive condensed water dripping from any one of the plurality of heat transfer tube groups 11. The shell 20 covers the plurality of heat transfer tube groups 11, the tube group protection member 15, the in-shell bypass pipe 14, and the water receiving tray 19.

[0025] The shell 20 has a connecting shell 30 and a main shell 40. The connecting shell 30 guides steam exhausted from the steam turbine 2 into the main shell 40. The connecting shell 30 extends in the axial direction Da and has a steam port 38 formed on the axial upstream side Dau and a steam outlet 39 formed on the axial downstream side Dad. The connecting shell 30 has a first connecting side plate 31 and a second connecting side plate 32 extending in the axial direction Da and facing each other vertically, and a third connecting side plate 33 and a fourth connecting side plate 34 extending vertically and facing each other horizontally perpendicular to the axial direction Da. The steam port 38 is defined by the edges of each connecting side plate 31, 32, 33, and 34 on the axial upstream side Dau. The steam outlet 39 is defined by the edges of each connecting side plate 31, 32, 33, and 34 on the axial downstream side Dad. In the connecting body 30, the edge on the upstream axial side Dau where the steam port 38 is formed is connected to the edge on the downstream axial side Dad of the turbine casing 2c where the steam exhaust port 2o is formed in the turbine casing 2c.

[0026] The main body shell 40 is formed with a main body steam port 48 through which steam can flow in from the connecting shell 30. The main body shell 40 has a first main body side plate 41, a second main body side plate 42, a third main body side plate 43, a fourth main body side plate 44, a main body steam port forming plate 45, a steam port opposing plate 46, an inlet water chamber frame 47i, an outlet water chamber frame 47o, an inlet tube plate 43i, and an outlet tube plate 44o.

[0027] The first body side plate 41 and the second body side plate 42 both extend in the axial direction Da and a horizontal direction perpendicular to the axial direction Da, and face each other vertically. The third body side plate 43 and the fourth body side plate 44 both extend in the axial direction Da and a vertical direction, and face each other horizontally perpendicular to the axial direction Da. The body steam port forming plate 45 and the steam port opposing plate 46 both extend vertically and horizontally perpendicular to the axial direction Da, and face each other in the axial direction Da. An edge on the axial upstream side Dau of the first body side plate 41 is connected to an edge on the axial downstream side Dad of the first connection side plate 31. An upper edge of the third body side plate 43 is connected to an edge on one side of the first body side plate 41 in the horizontal direction perpendicular to the axial direction Da. A lower edge of the third body side plate 43 is connected to an edge on one side of the second body side plate 42 in the horizontal direction perpendicular to the axial direction Da. The upper edge of the fourth main body side plate 44 is connected to the edge of the first main body side plate 41 on the other side in the horizontal direction perpendicular to the axial direction Da. The lower edge of the fourth main body side plate 44 is connected to the edge of the second main body side plate 42 on the other side in the horizontal direction perpendicular to the axial direction Da. The edge of the axial downstream side Dad of the first main body side plate 41, the edge of the axial downstream side Dad of the second main body side plate 42, the edge of the axial downstream side Dad of the third main body side plate 43, and the edge of the axial downstream side Dad of the fourth main body side plate 44 are all connected to the steam port opposing plate 46. The upper edge of the main body steam port forming plate 45 is connected to the edge of the axial downstream side Dad of the second connection side plate 32. One edge of the main body steam port forming plate 45 in the horizontal direction perpendicular to the axial direction Da is connected to a part of the edge of the axial downstream side Dad of the third main body side plate 43. The other edge of the main body steam port forming plate 45 in the horizontal direction perpendicular to the axial direction Da is connected to a part of the edge of the fourth main body side plate 44 on the axial downstream side Dad.

[0028] The main body steam port 48 is defined by the edge of the first main body side plate 41 on the downstream axial side Dad, the edge of the third main body side plate 43 on the downstream axial side Dad, the edge of the fourth main body side plate 44 on the downstream axial side Dad, and the upper edge of the main body steam port forming plate 45. The position of this main body steam port 48 substantially coincides with the position of the steam outlet 39 of the connecting shell 30. The first main body side plate 41 is the top plate of the main body shell 40 in this embodiment, and the second main body side plate 42 is the bottom plate of the main body shell 40 in this embodiment.

[0029] An inlet water chamber frame 47i is provided on the third main body side plate 43 on the side opposite to the side where the fourth main body side plate 44 is located. The portion of the third main body side plate 43 where the inlet water chamber frame 47i is provided is open. The inlet tube plate 43i is provided on the third main body side plate 43 so as to close this opening.

[0030] An outlet water chamber frame 47o is provided on the fourth main body side plate 44 on the side opposite to the side where the third main body side plate 43 is located. The portion of the fourth main body side plate 44 where the outlet water chamber frame 47o is provided is open. The outlet tube plate 44o is provided on the fourth main body side plate 44 so as to close this opening.

[0031] The first side plate 21 of the barrel 20, which is composed of the connecting barrel 30 and the main barrel 40, has a first connecting side plate 31 of the connecting barrel 30 and a first main barrel side plate 41 of the main barrel 40. The second side plate 22 of the barrel 20 has a second connecting side plate 32 of the connecting barrel 30, a second main barrel side plate 42 of the main barrel 40, and a main steam port forming plate 45.

[0032] Here, the direction in which the steam port opposing plate 46 of the main shell 40 is present relative to the steam port 38 of the connecting shell 30 is defined as the main steam inflow direction Dms. Therefore, in this embodiment, the axial downstream side Dad is the main steam inflow direction Dms. Furthermore, the direction in which the first side plate 21 and the second side plate 22 face each other, which has a directional component perpendicular to the main steam inflow direction Dms, is defined as the first lateral direction Ds1. Therefore, in this embodiment, the vertical direction is defined as the first lateral direction Ds1. A direction having directional components perpendicular to both the main steam inflow direction Dms and the first lateral direction Ds1 is defined as the second lateral direction Ds2. Therefore, in this embodiment, the horizontal direction perpendicular to the axial direction Da is the second lateral direction Ds2.

[0033] The intra-body bypass pipe 14 is connected to the third connecting side plate 33 of the connecting body 30 and is disposed within the connecting body 30 so as to extend in the second lateral direction Ds2. As shown in FIGS. 2 to 4 , the intra-body bypass pipe 14 is formed with a plurality of ejection holes 14a, 14b that can eject steam from the bypass line 5 into the body 20. Of the plurality of ejection holes 14a, 14b, a plurality of first ejection holes 14a, which are a portion of the plurality of ejection holes 14a, are formed so as to be able to eject steam within the intra-body bypass pipe 14 toward the first side plate 21. The plurality of first ejection holes 14a are aligned in the second lateral direction Ds2. Of the plurality of ejection holes 14a, 14b, a plurality of second ejection holes 14b, which are the other portion of the plurality of ejection holes 14b, are formed so as to be able to eject steam within the intra-body bypass pipe 14 toward the second side plate 22. The plurality of second ejection holes 14b are also aligned in the second lateral direction Ds2.

[0034] Specifically, the multiple first ejection holes 14a are formed to be able to eject steam in the intra-body bypass pipe 14 in a direction including a directional component of the main steam inflow direction Dms and a directional component toward the first side plate 21. Therefore, the penetration direction of the first ejection holes 14a in the intra-body bypass pipe 14 is a direction including a directional component of the main steam inflow direction Dms and a directional component toward the first side plate 21. For example, as shown in Fig. 3 , the penetration direction of the first ejection holes 14a is a direction that forms an angle α1 of 45° to 65° toward the first side plate 21 with respect to an imaginary line that passes through the pipe central axis Ap of the intra-body bypass pipe 14 and extends in the main steam inflow direction Dms. Furthermore, for example, the penetration direction of the second ejection holes 14b is a direction α that forms an angle α2 of 45° to 65° toward the second side plate 22 with respect to an imaginary line that passes through the pipe central axis Ap of the intra-body bypass pipe 14 and extends in the main steam inflow direction Dms. The first and second jet holes 14a and 14b can both inject steam within an angle β ranging from ±5° to ±15° around the respective penetration directions.

[0035] As described above, in this embodiment, the multiple jet holes 14a, 14b formed in the in-body bypass pipe 14 are only the multiple first jet holes 14a and the multiple second jet holes 14b, and there are no jet holes that penetrate in a direction that has only a component of the main steam inflow direction Dms.

[0036] As shown in FIGS. 1 and 2 , the plurality of heat transfer tube groups 11 are arranged in the main body shell 40. The plurality of heat transfer tubes 12 constituting each of the plurality of heat transfer tube groups 11 all extend in the second lateral direction Ds2. One ends of the plurality of heat transfer tubes 12 in the second lateral direction Ds2 are connected to the inlet tube plate 43i, and the other ends of the plurality of heat transfer tubes 12 in the second lateral direction Ds2 are connected to the outlet tube plate 44o. The cooling water that has flowed into the inlet water chamber frame 47i flows into the plurality of heat transfer tubes 12 from one ends of the plurality of heat transfer tubes 12 in the second lateral direction Ds2. The cooling water that has flowed through the plurality of heat transfer tubes 12 flows out from the other ends of the plurality of heat transfer tubes 12 in the second lateral direction Ds2 and flows into the outlet water chamber frame 47o.

[0037] In this embodiment, the multiple heat transfer tube groups 11 include a first heat transfer tube group 11a, a second heat transfer tube group 11b, a third heat transfer tube group 11c, and a fourth heat transfer tube group 11d. The first heat transfer tube group 11a, the second heat transfer tube group 11b, the third heat transfer tube group 11c, and the fourth heat transfer tube group 11d are each composed of a multiple number of heat transfer tubes 12. The first heat transfer tube group 11a, the second heat transfer tube group 11b, the third heat transfer tube group 11c, and the fourth heat transfer tube group 11d are arranged in this order from the first main body side plate 41 side to the second main body side plate 42 side in the first lateral direction Ds1. In other words, the first heat transfer tube group 11a, the second heat transfer tube group 11b, the third heat transfer tube group 11c, and the fourth heat transfer tube group 11d are arranged in this order vertically from top to bottom.

[0038] In this embodiment, the multiple water receiving trays 19 include a first water receiving tray 19a, a second water receiving tray 19b, and a third water receiving tray 19c. The first water receiving tray 19a is disposed between the first heat transfer tube group 11a and the second heat transfer tube group 11b and can receive condensed water dripping from the first heat transfer tube group 11a. The second water receiving tray 19b is disposed between the second heat transfer tube group 11b and the third heat transfer tube group 11c and can receive condensed water dripping from the second heat transfer tube group 11b. The third water receiving tray 19c is disposed between the third heat transfer tube group 11c and the fourth heat transfer tube group 11d and can receive condensed water dripping from the third heat transfer tube group 11c.

[0039] The tube bank protection member 15 is disposed in a deployment region 50 within the main body shell 40. The deployment region 50 includes a first-side deployment region 51, a second-side deployment region 52, and a steam port-side deployment region 53. The first-side deployment region 51 extends in the main steam inflow direction Dms and the second lateral direction Ds2 between the multiple heat transfer tube groups 11 and the first main body side plate 41, and is a region within the main body shell 40 closer to the steam port 38. The second-side deployment region 52 extends in the main steam inflow direction Dms and the second lateral direction Ds2 between the multiple heat transfer tube groups 11 and the second main body side plate 42, and is a region within the main body shell 40 closer to the steam port 38. The width W of the first-side deployment region 51 and the second-side deployment region 52 in the main steam inflow direction Dms is 20% to 50% of the maximum dimension Lmax of the group of multiple heat transfer tube groups 11 in the main steam inflow direction Dms, and is, for example, 40%. The steam port side development region 53 is a region that extends in the first lateral direction Ds1 and the second lateral direction Ds2 between the in-body bypass pipe 14 and the plurality of heat transfer tube groups 11 within the main body shell 40.

[0040] The end of the steam port side deployment area 53 on the first main body side plate 41 side is connected to the end of the first side deployment area 51 on the steam port 38 side. The end of the steam port side deployment area 53 on the second main body side plate 42 side is connected to the end of the second side deployment area 52 on the steam port 38 side.

[0041] As shown in FIGS. 4 and 5 , the tube bank protection member 15 has a plurality of dummy rods 16 extending in the second lateral direction Ds2 and arranged at intervals from one another. Some of the dummy rods 16 form a plurality of outer dummy rods 16o, and other of the dummy rods 16 form a plurality of inner dummy rods 16i. The outer dummy rods 16o are arranged at intervals from one another in an arrangement direction Dl perpendicular to the second lateral direction Ds2 in the direction in which the deployment regions 51, 52, and 53 extend. The inner dummy rods 16i are arranged at intervals from one another in the arrangement direction Dl, closer to the heat transfer tube banks 11 than the outer dummy rods 16o. Any of the inner dummy rods 16i is arranged at a position between the outer dummy rods 16o in the arrangement direction Dl.

[0042] The direction in which the first-side deployment area 51 and the second-side deployment area 52 expand and which is perpendicular to the second lateral direction Ds2 is the main steam inflow direction Dms. Therefore, the arrangement direction Dl in the first-side deployment area 51 and the second-side deployment area 52 is the main steam inflow direction Dms. Therefore, in the first-side deployment area 51 and the second-side deployment area 52, the multiple outer dummy rods 16o are arranged in the main steam inflow direction Dms, and the multiple inner dummy rods 16i are also arranged in the main steam inflow direction Dms. The direction in which the steam port side deployment area 53 expands and which is perpendicular to the second lateral direction Ds2 is the first lateral direction Ds1. Therefore, the arrangement direction Dl in the steam port side deployment area 53 is the first lateral direction Ds1. Therefore, in the steam port side deployment area 53, the multiple outer dummy rods 16o are arranged in the first lateral direction Ds1, and the multiple inner dummy rods 16i are also arranged in the first lateral direction Ds1.

[0043] The multiple dummy rods 16 have circular cross sections and the same outer diameter. The outer diameter of the dummy rods 16 is, for example, 20 to 35 mm. As shown in FIG. 5 , the distance dl between the rod central axes Ar of the multiple outer dummy rods 16o in the arrangement direction Dl is 2.4 times or less the outer diameter of the dummy rods 16, and in this embodiment, it is twice the distance. The distance dl between the rod central axes Ar of the multiple inner dummy rods 16i in the arrangement direction Dl is also 2.4 times or less the outer diameter of the dummy rods 16, and in this embodiment, it is twice the distance. Therefore, in this embodiment, the distance dla in the arrangement direction Dl between the rod central axis Ar of one inner dummy rod 16i and the rod central axis Ar of one outer dummy rod 16o adjacent to this inner dummy rod 16i in the arrangement direction Dl is 1.0 times the outer diameter of the dummy rod 16. In the inter-row direction Dr, which is a direction perpendicular to the arrangement direction Dl and in which a row of a plurality of inner dummy rods 16i exists relative to a row of a plurality of outer dummy rods 16o, the distance dr between the rod center axis Ar of each of the plurality of outer dummy rods 16o and the rod center axis Ar of each of the plurality of inner dummy rods 16i is a distance of 1.2 times or less the outer diameter of the dummy rod 16, and in this embodiment, is a distance of 1.05 times the outer diameter of the dummy rod 16.

[0044] The inter-rod angle γ formed by a line segment connecting the rod central axis Ar of one inner dummy rod 16i and the rod central axis Ar of one outer dummy rod 16o adjacent to this inner dummy rod 16i on one side in the arrangement direction Dl with a line segment connecting the rod central axis Ar of one inner dummy rod 16i and the rod central axis Ar of another outer dummy rod 16o adjacent to this inner dummy rod 16i on the other side in the arrangement direction Dl is 60° or more. In this embodiment, this inter-rod angle γ is 90° or more.

[0045] In the plant described above, boiler 1 is started, and the main steam valve 4 is closed and bypass valve 6 is opened until the temperature of the steam generated by boiler 1 reaches a predetermined temperature and the pressure of the steam reaches a predetermined pressure. As a result, the steam from boiler 1 flows into condenser 10 via part of main steam line 3 and bypass line 5. This steam often contains foreign matter. In particular, after construction or repair of a plant, foreign matter such as welding slag and grinding chips remains in the piping and various equipment. Therefore, to prevent these foreign matter from flowing into steam turbine 2, the steam from boiler 1 is caused to flow directly into condenser 10 via part of main steam line 3 and bypass line 5.

[0046] In this embodiment, steam containing foreign matter flows from the bypass line 5 into the in-body bypass pipe 14 and is ejected from this in-body bypass pipe 14 into the body 20 of the condenser 10. Therefore, in this embodiment, it is possible to avoid releasing steam containing foreign matter into the atmosphere.

[0047] In this embodiment, a portion of the steam that has flowed into the intra-body bypass pipe 14 is ejected from the multiple first ejection holes 14a toward the first side plate 21 of the body 20, and the remaining portion of the steam is ejected from the multiple second ejection holes 14b toward the second side plate 22 of the body 20. Therefore, in this embodiment, the amount of foreign matter that travels directly from the intra-body bypass pipe 14 toward the multiple heat transfer tube groups 11 can be reduced. Therefore, in this embodiment, it is possible to reduce the amount of foreign matter contained in the steam ejected from the intra-body bypass pipe 14 that contaminates or damages the multiple heat transfer tube groups 11 that make up each of the multiple heat transfer tube groups 11.

[0048] Foreign matter contained in the steam ejected toward the first side plate 21 collides with the first side plate 21, and then most of the foreign matter moves toward the plurality of heat transfer tube groups 11. The foreign matter collides with the tube group protection member 15 arranged in the first side deployment region 51 between the first side plate 21 and the plurality of heat transfer tube groups 11. Therefore, in this embodiment, it is possible to prevent foreign matter contained in the steam ejected toward the first side plate 21 from soiling or damaging the plurality of heat transfer tube groups 11 that constitute each of the plurality of heat transfer tube groups 11. Furthermore, foreign matter contained in the steam ejected toward the second side plate 22 collides with the second side plate 22, and then most of the foreign matter moves toward the plurality of heat transfer tube groups 11. The foreign matter collides with the tube group protection member 15 arranged in the second side deployment region 52 between the second side plate 22 and the plurality of heat transfer tube groups 11. Therefore, in this embodiment, it is possible to prevent foreign matter contained in the steam ejected toward the second side plate 22 from soiling or damaging the plurality of heat transfer tube groups 11 that constitute each of the plurality of heat transfer tube groups 11.

[0049] Most of the foreign matter contained in the steam ejected from the intra-body bypass pipe 14 toward the first side plate 21 heads toward an area within the main body 40 closer to the steam ports 38 of the multiple heat transfer tube groups 11, and these foreign matter rarely heads toward an area closer to the steam port facing plate 46 of the multiple heat transfer tube groups 11. Furthermore, most of the foreign matter contained in the steam ejected from the intra-body bypass pipe 14 toward the second side plate 22 heads toward an area closer to the steam ports 38 of the multiple heat transfer tube groups 11, and these foreign matter rarely heads toward an area closer to the steam port facing plate 46 of the multiple heat transfer tube groups 11. Therefore, in this embodiment, the areas toward which most of the foreign matter heads are set to the first side deployment region 51 and the second side deployment region 52, thereby reducing the amount of tube group protection member 15 arranged in each deployment region 51, 52.

[0050] As described above, most of the foreign matter contained in the steam ejected from the internal bypass pipe 14 toward the first side plate 21 collides with this first side plate 21 and then heads toward the plurality of heat transfer tube groups 11. However, depending on the arrangement of the first side plate 21, some of the foreign matter may head toward the portion of the plurality of heat transfer tube groups 11 on the steam port 38 side. Also, as described above, most of the foreign matter contained in the steam ejected from the internal bypass pipe 14 toward the second side plate 22 collides with this second side plate 22 and then heads toward the plurality of heat transfer tube groups 11. However, depending on the arrangement of the second side plate 22, some of the foreign matter may head toward the portion of the plurality of heat transfer tube groups 11 on the steam port 38 side.

[0051] In this embodiment, the tube bank protection member 15 arranged in the steam port side deployment area 53 can prevent foreign matter heading toward the portion of the plurality of heat transfer tube groups 11 on the steam port 38 side of the plurality of heat transfer tube groups 11 from soiling or damaging the plurality of heat transfer tube groups 11 that make up each of the plurality of heat transfer tube groups 11. As described above, since almost no foreign matter heads directly from the in-body bypass pipe 14 toward the plurality of heat transfer tube groups 11, it is not necessary to increase the density of the plurality of dummy rods 16 arranged in the steam port side deployment area 53 or to arrange three or more rows of dummy rods 16 in the steam port side deployment area 53.

[0052] In this embodiment, the tube bank protection member 15 is configured by arranging a plurality of dummy rods 16 in a staggered manner, thereby allowing the passage of steam and efficiently suppressing the passage of foreign matter.

[0053] Moreover, in this embodiment, since the multiple outer dummy rods 16o and the multiple inner dummy rods 16i are arranged as described above, it is possible to prevent the passage of most foreign objects flying in from various directions while allowing steam to pass through.

[0054] As described above, the multiple dummy rods 16 in this embodiment have a circular cross section. Therefore, steam can pass between the multiple dummy rods 16 more smoothly than when, for example, dummy rods with a square cross section are used, and the erosion resistance of the multiple dummy rods 16 can be improved. Therefore, in this embodiment, the multiple dummy rods 16 can be installed even during normal operation in which steam from the boiler 1 flows into the condenser via the main steam line 3 and the steam turbine.

[0055] "Second embodiment of condenser" The condenser in this embodiment is also provided in the plant described with reference to FIG. 1, similar to the condenser 10 in the first embodiment.

[0056] 6 and 7, the condenser 10a in this embodiment has the same basic configuration as the condenser 10 in the first embodiment. However, the deployment area 50a in which the tube group protecting member 15 of the condenser 10a in this embodiment is arranged is different from the deployment area 50 in which the tube group protecting member 15 of the condenser 10 in the first embodiment is arranged.

[0057] The deployment region 50a in this embodiment will be described in detail below. The deployment region 50a in this embodiment includes a first-side deployment region 51, a second-side deployment region 52, a steam port-side deployment region 53a, a first-side angle deployment region 54f, a second-side angle deployment region 54s, an inter-tube-bundle deployment region 53m, and an intermediate-angle deployment region 54m.

[0058] The steam port side deployment area 53a has a first steam port side deployment area 53f and a second steam port side deployment area 53s. The first steam port side deployment area 53f and the second steam port side deployment area 53s are both areas that extend in the first lateral direction Ds1 and the second lateral direction Ds2 between the intra-body bypass pipe 14 and the plurality of heat transfer tube groups 11 inside the main body shell 40. However, the first steam port side deployment area 53f is an area closer to the first side plate 21, and the second steam port side deployment area 53s is an area closer to the second side plate 22. There is a gap between the first steam port side deployment area 53f and the second steam port side deployment area 53f in the first lateral direction Ds1.

[0059] The end of the first steam port side development area 53f on the first side plate 21 side is not directly connected to the first side development area 51. In other words, there is a gap between the first steam port side development area 53f and the first side development area 51. The position of the end of the first side development area 51 on the steam port 38 side is closer to the steam port opposing plate 46 than the first steam port side development area 53f. The first side angle development area 54f is the area between the end of the first side development area 51 on the steam port 38 side and the end of the first steam port side development area 53f on the first side plate 21 side. This first side angle development area 54f is an area that extends in a first inclined direction Di1 that includes a component in the first lateral direction Ds1 and a component in the main steam inflow direction Dms, and in a second lateral direction Ds2.

[0060] The end of the second steam port side deployment area 53s on the second side plate 22 side is not directly connected to the second side deployment area 52. In other words, there is a gap between the second steam port side deployment area 53s and the second side deployment area 52. The position of the end of the second side deployment area 52 on the steam port 38 side is closer to the steam port opposing plate 46 than the second steam port side deployment area 53s. The second side corner deployment area 54s is the area between the end of the second side deployment area 52 on the steam port 38 side and the end of the second steam port side deployment area 53s on the second side plate 22 side. This second side corner deployment area 54s is an area that extends in the second side direction Ds2 and in a second inclined direction Di2 that includes a component in the first side direction Ds1 and a component in the main steam inflow direction Dms.

[0061] An intermediate-angle deployment region 54m is connected to the end of the second steam port-side deployment region 53s on the side of the first side plate 21. This intermediate-angle deployment region 54m is a region that extends in a first inclined direction Di1, which includes a component in the first lateral direction Ds1 and a component in the main steam inflow direction Dms, and in the second lateral direction Ds2. The end of the intermediate-angle deployment region 54m in the main steam inflow direction Dms is located between the second heat transfer tube group 11b and the third heat transfer tube group 11c. An inter-tube group deployment region 53m is connected to the end of the intermediate-angle deployment region 54m in the main steam inflow direction Dms. Similar to the first-side deployment region 51 and the second-side deployment region 52, this inter-tube group deployment region 53m extends in the main steam inflow direction Dms and the second lateral direction Ds2 between the second heat transfer tube group 11b and the third heat transfer tube group 11c.

[0062] The width W of the main steam inflow direction Dms in the combined deployment area 51, 54f of the first side deployment area 51 and the first side angle deployment area 54f, the width W of the main steam inflow direction Dms in the combined deployment area 52, 54s of the second side deployment area 52 and the second side angle deployment area 54s, and the width W of the main steam inflow direction Dms in the combined deployment area 53m, 54m of the inter-tube bundle deployment area 53m and the intermediate angle deployment area 54m are all 20% to 50%, for example 40%, of the maximum dimension Lmax of the group of multiple heat transfer tube bundles 11 in the main steam inflow direction Dms.

[0063] The arrangement of the multiple dummy rods 16 in each deployment area 51, 52, 53f, 53s, 53m, 54f, 54s, and 54m in this embodiment is the same as the arrangement of the multiple dummy rods 16 in each deployment area 51, 52, and 53 in the first embodiment. Note that the arrangement direction Dl in which the multiple dummy rods 16 are arranged in the first side angle deployment area 54f is the first inclined direction Di1. The arrangement direction Dl in which the multiple dummy rods 16 are arranged in the second side angle deployment area 54s is the second inclined direction Di2. The arrangement direction Dl in which the multiple dummy rods 16 are arranged in the intermediate angle deployment area 54m is the first inclined direction Di1.

[0064] In this embodiment, similarly to the first embodiment, steam containing foreign matter is not released into the atmosphere, and contamination or damage to the heat transfer tubes 12 can be suppressed.

[0065] Furthermore, in this embodiment, the area of the deployment region 50 can be made smaller than in the first embodiment, where the first-side deployment region 51 and the second-side deployment region 52 perpendicularly intersect with the steam port-side deployment region 53. Therefore, in this embodiment, the amount of tube bank protection members 15 arranged in the deployment region 50a can be reduced.

[0066] 7, of the multiple outer dummy rods 16o arranged in the second steam port side deployment area 53s, the outer dummy rod 16o closest to the second side plate 22 is referred to as the steam port side end dummy rod 16xa. Furthermore, of the multiple outer dummy rods 16o arranged in the second side corner deployment area 54s, the outer dummy rod 16o adjacent to the steam port side end dummy rod 16xa is referred to as the second side end dummy rod 16ya. Furthermore, as shown in FIG. 5, which shows the arrangement of the multiple dummy rods 16 in the first embodiment, of the multiple outer dummy rods 16o arranged in the steam port side deployment area 53, the outer dummy rod 16o closest to the second side plate 22 is referred to as the steam port side end dummy rod 16x. Furthermore, of the multiple outer dummy rods 16o arranged in the second side deployment area 52, the outer dummy rod 16o adjacent to the steam port side end dummy rod 16x is referred to as the second side end dummy rod 16y. The minimum distance dmina between the steam port side end dummy rod 16xa and the second side end dummy rod 16ya shown in Fig. 7 is narrower than the minimum distance dmin between the steam port side end dummy rod 16x and the second side end dummy rod 16y shown in Fig. 5. Therefore, in this embodiment, the amount of foreign matter that passes through the joint between the two mutually connected deployment areas can be made smaller than in the first embodiment.

[0067] In the present embodiment, the arrangement of the dummy rods 16 in the connecting portion between the second side angle deployment region 54s and the second-side deployment region 52, the connecting portion between the first steam port side deployment region 53f and the first side angle deployment region 54f, the connecting portion between the first side angle deployment region 54f and the first-side deployment region 51, the connecting portion between the second steam port side deployment region 53s and the intermediate angle deployment region 54m, and the connecting portion between the intermediate angle deployment region 54m and the inter-tube bundle deployment region 53m is the same as the arrangement of the dummy rods 16 in the connecting portion between the second steam port side deployment region 53s and the second side angle deployment region 54s described above.

[0068] "Third embodiment of condenser" As shown in FIG. 8, the condenser 10b in this embodiment is also provided in a plant including a steam turbine 2b.

[0069] Like the plants in each of the above embodiments, this plant also includes a steam turbine 2b, a boiler 1, a main steam line 3, a main steam valve 4, a bypass line 5, a bypass valve 6, a feedwater line 7, a feedwater pump 8, and a condenser 10b.

[0070] The steam turbine 2b has a turbine rotor 2r that can rotate about an axis A, and a turbine casing 2c that covers the turbine rotor 2r. For example, a rotor of a generator GEN is connected to one end of the turbine rotor 2r. A steam inlet 2i and a steam exhaust port 2o are formed in the turbine casing 2c. However, the steam exhaust port 2o opens downward from inside the turbine casing 2c. Therefore, this steam turbine 2b is a downward exhaust type steam turbine.

[0071] Similar to the condensers 10 and 10a in the above embodiments, the condenser 10b includes a plurality of heat transfer tube groups 11, an in-shell bypass pipe 14, a tube group protection member 15, a plurality of water receiving trays 19, and a shell 20b. Each of the plurality of heat transfer tube groups 11 is composed of a plurality of heat transfer tubes 12. The in-shell bypass pipe 14 is connected to a bypass line 5, and allows steam to flow in from the outside without passing through the steam turbine 2b. The tube group protection member 15 allows steam to pass through while preventing the passage of foreign matter. The water receiving tray 19 can receive condensed water dripping from any one of the plurality of heat transfer tube groups 11. The shell 20b covers the plurality of heat transfer tube groups 11, the tube group protection member 15, the in-shell bypass pipe 14, and the water receiving tray 19.

[0072] The shell 20b includes a connecting shell 30b and a main shell 40b. The connecting shell 30b guides steam exhausted from the steam turbine 2b into the main shell 40b. The connecting shell 30b extends vertically and has a steam port 38 formed on its upper side and a steam outlet 39 formed on its lower side. The connecting shell 30b extends horizontally, perpendicular to the vertical direction and the axial direction Da, and has a first connecting side plate 31b and a second connecting side plate 32b that face each other in the axial direction Da. The steam port 38 is defined by the edges of the connecting side plates 31b, 32b on the upstream axial side Dau. The steam outlet 39 is defined by the lower edges of the connecting side plates 31b, 32b. The upper edge of the connecting shell 30b, where the steam port 38 is formed, is connected to the lower edge of the turbine casing 2c, where the steam exhaust port 2o is formed.

[0073] The main body barrel 40b is formed with a main body steam port 48 through which steam can flow in from the connecting barrel 30b. This main body barrel 40b has a first main body side plate 41b, a second main body side plate 42b, and a steam port opposing plate 46b. Although not shown, this main body barrel 40b also has an inlet water chamber frame, an outlet water chamber frame, etc., similar to the main body barrel 40b in the first embodiment.

[0074] The first body side plate 41b and the second body side plate 42b both extend vertically and horizontally perpendicular to the axial direction Da, and face each other in the axial direction Da. The upper edge of the first body side plate 41b is connected to the lower edge of the first connecting side plate 31b. The upper edge of the second body side plate 42b is connected to the lower edge of the second connecting side plate 32b. The lower edge of the first body side plate 41b and the lower edge of the second body side plate 42b are connected by a steam port facing plate 46b. This steam port facing plate 46b is the bottom plate of the body shell 40b in this embodiment. The body steam port 48 is defined by the upper edge of the first body side plate 41b and the upper edge of the second body side plate 42b. The position of this body steam port 48 substantially coincides with the position of the steam outlet 39 of the connecting shell 30b.

[0075] The first side plate 21b of the barrel 20b, which is composed of the connecting barrel 30b and the main barrel 40b, has a first connecting side plate 31b of the connecting barrel 30b and a first main barrel side plate 41b of the main barrel 40b. The second side plate 22b of the barrel 20b has a second connecting side plate 32b of the connecting barrel 30b and a second main barrel side plate 42b of the main barrel 40b.

[0076] Here, the direction in which the steam port opposing plate 46b of the main body shell 40b is located relative to the steam port 38 of the connecting shell 30b is defined as the main steam inflow direction Dms. Therefore, in this embodiment, the vertical downward direction is the main steam inflow direction Dms. Furthermore, the direction in which the first side plate 21b and the second side plate 22b face each other, which has a directional component perpendicular to the main steam inflow direction Dms, is defined as the first lateral direction Ds1. Therefore, in this embodiment, the axial direction Da is the first lateral direction Ds1. Furthermore, the direction having directional components perpendicular to both the main steam inflow direction Dms and the first lateral direction Ds1 is defined as the second lateral direction Ds2. Therefore, in this embodiment, the horizontal direction perpendicular to the axial direction Da is the second lateral direction Ds2.

[0077] The intra-body bypass pipe 14 is connected to the connecting body 30b and is disposed so as to extend in the second side direction Ds2 within the connecting body 30b. Similar to the intra-body bypass pipe 14 in the first embodiment, a plurality of first ejection holes and a plurality of second ejection holes are formed in the intra-body bypass pipe 14.

[0078] The plurality of heat transfer tube groups 11 are arranged in the main body shell 40b. In this embodiment, the plurality of heat transfer tube groups 11 include a first heat transfer tube group 11a, a second heat transfer tube group 11b, a third heat transfer tube group 11c, and a fourth heat transfer tube group 11d. The first heat transfer tube group 11a, the second heat transfer tube group 11b, the third heat transfer tube group 11c, and the fourth heat transfer tube group 11d are each composed of a plurality of heat transfer tubes 12. The plurality of heat transfer tubes 12 all extend in the second lateral direction Ds2. The second heat transfer tube group 11b is arranged on the other of the one side and the other side of the first heat transfer tube group 11a in the first lateral direction Ds1. The third heat transfer tube group 11c is arranged below the first heat transfer tube group 11a. The fourth heat transfer pipe group 11d is disposed on the other side of the third heat transfer pipe group 11c in the first side direction Ds1 and below the second electric heating pipe group.

[0079] In this embodiment, the multiple water receiving trays 19 include a first water receiving tray 19a and a second water receiving tray 19b. The first water receiving tray 19a is disposed between the first heat transfer tube group 11a and the third heat transfer tube group 11c and can receive condensed water dripping from the first heat transfer tube group 11a. The second water receiving tray 19b is disposed between the second heat transfer tube group 11b and the fourth heat transfer tube group 11d and can receive condensed water dripping from the second heat transfer tube group 11b.

[0080] The tube bank protection member 15 is arranged in a deployment region 50b inside the main body trunk 40b. The deployment region 50b includes a first-side deployment region 51, a second-side deployment region 52, and a steam port-side deployment region 53. The first-side deployment region 51 extends in the main steam inflow direction Dms and the second lateral direction Ds2 between the multiple heat transfer tube groups 11 and the first main body side plate 41b, and is a region within the main body trunk 40b closer to the steam port 38. The second-side deployment region 52 extends in the main steam inflow direction Dms and the second lateral direction Ds2 between the multiple heat transfer tube groups 11 and the second main body side plate 42b, and is a region within the main body trunk 40b closer to the steam port 38. The width W of the first-side deployment region 51 and the second-side deployment region 52 in the main steam inflow direction Dms is 20% to 50% of the maximum dimension Lmax of the group of multiple heat transfer tube groups 11 in the main steam inflow direction Dms, and is, for example, 40%. The steam port side development region 53 is a region that expands in the first lateral direction Ds1 and the second lateral direction Ds2 between the intra-body bypass pipe 14 and the plurality of heat transfer tube groups 11 inside the main body shell 40b.

[0081] The end of the steam port side deployment area 53 on the side of the first main body side plate 41b is connected to the end of the first side deployment area 51 on the side of the steam port 38. The end of the steam port side deployment area 53 on the side of the second main body side plate 42b is connected to the end of the second side deployment area 52 on the side of the steam port 38.

[0082] Like the tube bank protection member 15 in the above-described embodiments, the tube bank protection member 15 has a plurality of dummy rods 16 extending in the second lateral direction Ds2 and arranged at intervals from one another. Of the plurality of dummy rods 16, some of the dummy rods 16 form a plurality of outer dummy rods 16o, and other of the plurality of dummy rods 16 form a plurality of inner dummy rods 16i. The arrangement of the plurality of dummy rods 16 in each of the deployment regions 51, 52, 53 in this embodiment is the same as the arrangement of the plurality of dummy rods 16 in each of the deployment regions 51, 52, 53 in the first embodiment.

[0083] In this embodiment, similarly to the above-described embodiments, steam containing foreign matter is not released into the atmosphere, and contamination or damage to the heat transfer tubes 12 can be prevented.

[0084] "Other Modifications" The condensers 10, 10a in the first and second embodiments are both condensers adapted to an axial exhaust steam turbine 2. However, the condensers 10, 10a in these embodiments can also be adapted to a side exhaust steam turbine.

[0085] The deployment region 50b in the third embodiment has a first-side deployment region 51, a second-side deployment region 52, and a steam port side deployment region 53. However, like the deployment region 50a in the second embodiment, the deployment region 50b in the third embodiment may further have a first side angle deployment region 54f and a second side angle deployment region 54s. Also, like the steam port side deployment region 53a in the second embodiment, the steam port side deployment region 53 in the third embodiment may have a first steam port side deployment region 53f and a second steam port side deployment region 53s. In this case, like the deployment region 50a in the second embodiment, the deployment region 50b in the third embodiment may further have an inter-tube bank deployment region 53m and a mid-angle deployment region 54m.

[0086] The intra-body bypass pipe 14 in each of the above embodiments is formed with a plurality of first ejection holes 14a that can eject steam from within the intra-body bypass pipe 14 toward the first side plates 21, 21b and a plurality of second ejection holes 14b that can eject steam from within the intra-body bypass pipe 14 toward the second side plates 22, 22b. However, only one of the plurality of first ejection holes 14a and the plurality of second ejection holes 14b may be formed in the intra-body bypass pipe 14. In this case, the tube bank protection member 15 may be arranged only in the first side deployment region 51 or the second side deployment region 52, whichever side ejects steam from the plurality of ejection holes.

[0087] The cross section of the dummy rod 16 in each of the above embodiments is circular. However, the cross section of the dummy rod 16 does not have to be circular, and may be, for example, triangular, rectangular, pentagonal, or the like.

[0088] In each of the above embodiments, the condensers 10, 10a, and 10b have four heat transfer tube groups 11a, 11b, 11c, and 11d. However, the condensers 10, 10a, and 10b may have one or more heat transfer tube groups 11.

[0089] Furthermore, the present disclosure is not limited to the embodiments described above, and various additions, modifications, substitutions, partial deletions, etc. are possible within the scope of the conceptual idea and spirit of the present invention as derived from the content defined in the claims and their equivalents.

[0090] "Addendum" The condensers 10, 10a, 10b in the above-described embodiment and modified examples can be understood, for example, as follows.

[0091] (1) The condensers 10, 10a, and 10b in the first embodiment are: The steam turbine includes one or more heat transfer tube groups 11 each composed of a plurality of heat transfer tubes 12, an in-shell bypass pipe 14 through which steam can flow in from the outside without passing through a steam turbine 2, 2b, a tube group protection member 15 that allows steam to pass through while preventing foreign matter from passing through, and a shell 20, 20b that covers the one or more heat transfer tube groups 11, the tube group protection member 15, and the in-shell bypass pipe 14. The shell 20, 20b has a steam port 38 through which steam exhausted from the steam turbine 2, 2b can flow in, a steam port opposing plate 46, 46b that is disposed on the opposite side of the one or more heat transfer tube groups 11 from the steam port 38, and a plurality of side plates 21, 21b, 22, 22b that extend from the steam port 38 to the steam port opposing plate 46, 46b. The multiple side plates 21, 21b, 22, 22b include a first side plate 21, 21b and a second side plate 22, 22b that face each other in a first lateral direction Ds1 having a directional component perpendicular to a main steam inflow direction Dms, which is a direction in which the steam port opposing plates 46, 46b exist relative to the steam port 38. The intra-shell bypass pipe 14 is disposed between the steam port 38 and the one or more heat transfer tube groups 11 in the main steam inflow direction Dms, extends in a second lateral direction Ds2 having a directional component perpendicular to both the main steam inflow direction Dms and the first lateral direction Ds1, and is connected to the shells 20, 20b. The intra-shell bypass pipe 14 is formed with a plurality of ejection holes 14a, 14b that can eject steam in the intra-shell bypass pipe 14 into the shells 20, 20b, toward at least one of the first side plate 21, 21b side and the second side plate 22, 22b side. The tube group protection member 15 is arranged in deployment regions 50, 50a, 50b that include at least side deployment regions 51, 52 that extend in the main steam inflow direction Dms and the second side direction Ds2, between the first side plate 21, 21b and the second side plate 22, 22b, whichever side plate from which the multiple ejection holes 14a, 14b eject steam, and the one or more heat transfer tube groups 11.

[0092] In this embodiment, steam containing foreign matter flows into the in-body bypass pipe 14 and is ejected into the bodies 20, 20b of the condensers 10, 10a, 10b from the in-body bypass pipe 14. Therefore, in this embodiment, it is possible to avoid releasing steam containing foreign matter into the atmosphere.

[0093] In this embodiment, the steam that has flowed into the intra-body bypass pipe 14 is ejected from the multiple ejection holes 14a, 14b onto at least one of the first side plates 21, 21b and the second side plates 22, 22b within the body 20, 20b. Therefore, in this embodiment, the amount of foreign matter that travels directly from the intra-body bypass pipe 14 toward one or more heat transfer tube groups 11 can be reduced. Therefore, in this embodiment, it is possible to prevent foreign matter contained in the steam ejected from the intra-body bypass pipe 14 from soiling or damaging the multiple heat transfer tube groups 11 that respectively constitute the one or more heat transfer tube groups 11.

[0094] Foreign matter contained in the steam ejected toward the one side plate collides with this one side plate, and most of this foreign matter moves toward the one or more heat transfer tube groups 11. This foreign matter collides with the tube group protection members 15 arranged in the side deployment regions 51, 52 between the one side plate and the one or more heat transfer tube groups 11. Therefore, in this embodiment, it is possible to prevent foreign matter contained in the steam ejected toward the one side plate from soiling or damaging the multiple heat transfer tube groups 11 that respectively constitute the one or more heat transfer tube groups 11.

[0095] (2) The condensers 10, 10a, and 10b in the second embodiment are In the condenser 10, 10a, 10b according to the first aspect, the side development regions 51, 52 are regions closer to the steam port 38 in a region closer to the steam port opposing plates 46, 46b than the in-body bypass pipe 14. The width W of the side development regions 51, 52 in the main steam inflow direction Dms is 20% to 50% of the maximum dimension Lmax of the group of the one or more heat transfer tube groups 11 in the main steam inflow direction Dms.

[0096] Most of the foreign matter contained in the steam ejected from the in-body bypass pipe 14 toward one of the side plates heads toward the region closer to the steam ports 38 of one or more heat transfer tube groups 11, and this foreign matter rarely heads toward the region closer to the steam port opposing plate 46 of one or more heat transfer tube groups 11. Therefore, in this embodiment, the region toward which most of the foreign matter heads is set to be the side deployment regions 51, 52, thereby reducing the amount of tube group protection member 15 arranged in the side deployment regions 51, 52.

[0097] (3) The condensers 10, 10a, and 10b in the third embodiment are In the condenser 10, 10a, 10b according to the first aspect or the second aspect, the plurality of ejection holes 14a, 14b include a plurality of first ejection holes 14a that can eject steam in the intra-body bypass pipe toward the first side plate 21, 21b and a plurality of second ejection holes 14b that can eject steam in the intra-body bypass pipe toward the second side plate 22, 22b. The side development regions 51, 52 include a first side development region 51 that extends in the main steam inflow direction Dms and the second side direction Ds2 between the one or more heat transfer tube groups 11 and the first side plate 21, 21b, and a second side development region 52 that extends in the main steam inflow direction Dms and the second side direction Ds2 between the one or more heat transfer tube groups and the second side plate 22, 22b.

[0098] (4) The condensers 10, 10a, and 10b in the fourth aspect are In the condenser 10, 10a, 10b according to any one of the first to third aspects, the deployment region 50, 50a, 50b includes a steam port side deployment region 53, 53a extending in the first lateral direction Ds1 and the second lateral direction Ds2 between the in-body bypass pipe 14 and the one or more heat transfer tube groups 11.

[0099] As described above, most of the foreign matter contained in the steam ejected from the internal bypass pipe 14 toward the first side plate 21, 21b collides with the first side plate 21, 21b and then heads toward the one or more heat transfer tube groups 11. However, depending on the arrangement of the first side plates 21, 21b, some of the foreign matter may head toward the portion of the one or more heat transfer tube groups 11 that is on the steam port 38 side. Also, as described above, most of the foreign matter contained in the steam ejected from the internal bypass pipe 14 toward the second side plate 22, 22b collides with the second side plate 22, 22b and then heads toward the one or more heat transfer tube groups 11. However, depending on the arrangement of the second side plates 22, 22b, some of the foreign matter may head toward the portion of the one or more heat transfer tube groups 11 that is on the steam port 38 side.

[0100] In this embodiment, the tube group protection members 15 arranged in the steam port side deployment areas 53, 53a can prevent foreign matter heading toward the part of the one or more heat transfer tube groups 11 on the steam port 38 side from soiling or damaging the multiple heat transfer tube groups 11 that make up each of the one or more heat transfer tube groups 11.

[0101] (5) The condenser 10a in the fifth aspect is In the condenser 10a according to the third aspect, the deployment regions 50, 50a, 50b include steam port side deployment regions 53, 53a that extend in the first lateral direction Ds1 and the second lateral direction Ds2 between the in-body bypass pipe 14 and the one or more heat transfer tube groups 11. The position of the end of the first side deployment region 51 on the steam port 38 side and the position of the end of the second side deployment region 52 on the steam port 38 side are closer to the steam port facing plate 46 than the steam port side deployment region 53a. The deployment region 50a includes a first side corner deployment region 54f between the end of the first side deployment region 51 on the steam port 38 side and the end of the steam port side deployment region 53a on the first side plate 21 side, and a second side corner deployment region 54s between the end of the second side deployment region 52 on the steam port 38 side and the end of the steam port side deployment region 53a on the second side plate 22 side. The first side angle development region 54f is a region that extends in the first inclined direction Di1 including a component of the first side direction Ds1 and a component of the main steam inflow direction Dms, and in the second side direction Ds2. The second side angle development region 54s is a region that extends in the second inclined direction Di2 including a component of the first side direction Ds1 and a component of the main steam inflow direction Dms, and in the second side direction Ds2.

[0102] In this embodiment, the area of the deployment region 50a can be made smaller than when the first-side deployment region 51 and the second-side deployment region 52 intersect perpendicularly with the steam port-side deployment region 53a. Therefore, in this embodiment, the amount of tube group protection members 15 arranged in the deployment region 50a can be reduced. Furthermore, in this embodiment, the tube group protection members 15 can be easily arranged on the body 20, 20b.

[0103] (6) The condensers 10, 10a, and 10b in the sixth aspect are In the condenser 10a according to any one of the first to fifth aspects, the one or more heat transfer tube groups 11 include a plurality of heat transfer tube groups 11 arranged in the first lateral direction Ds1. The deployment region 50a includes an inter-tube group deployment region 53m that extends in the main steam inflow direction Dms and the second lateral direction Ds2 between any two heat transfer tube groups 11 adjacent to each other in the first lateral direction Ds1 among the plurality of heat transfer tube groups 11.

[0104] As described above, most of the foreign matter contained in the steam ejected from the internal bypass pipe 14 toward the first side plate 21 collides with the first side plate 21 and then heads toward the plurality of heat transfer tube groups 11. However, depending on the arrangement of the first side plate 21, etc., some of the foreign matter may head toward a gap between any two of the plurality of heat transfer tube groups 11 that are adjacent in the first side direction Ds1. Furthermore, as described above, most of the foreign matter contained in the steam ejected from the internal bypass pipe 14 toward the second side plate 22 collides with the second side plate 22 and then heads toward the plurality of heat transfer tube groups 11. However, depending on the arrangement of the second side plate 22, etc., some of the foreign matter may head toward a gap between any two of the plurality of heat transfer tube groups 11 that are adjacent in the first side direction Ds1.

[0105] In this embodiment, the tube group protection member 15 arranged in the inter-tube group expansion area 53m can prevent foreign matter heading toward the space between the two heat transfer tube groups 11 from contaminating or damaging the multiple heat transfer tube groups 11 that make up each of the two heat transfer tube groups 11.

[0106] (7) The condensers 10, 10a, and 10b in the seventh aspect are In the condenser 10, 10a, 10b in any one of the first to sixth embodiments, the tube group protection member 15 has a plurality of dummy rods 16 extending in the second side direction Ds2 and arranged at intervals from each other.

[0107] (8) The condensers 10, 10a, and 10b in the eighth aspect are In the condenser 10, 10a, 10b according to the seventh aspect, the plurality of dummy rods 16 include a plurality of outer dummy rods 16o and a plurality of inner dummy rods 16i. The plurality of outer dummy rods 16o are arranged at intervals from one another in an arrangement direction Dl perpendicular to the second lateral direction Ds2 and in the direction in which the deployment regions 50, 50a, 50b expand. The plurality of inner dummy rods 16i are arranged at intervals from one another in the arrangement direction Dl on the side of the one or more heat transfer tube groups 11 relative to the plurality of outer dummy rods 16o. Any of the plurality of inner dummy rods 16i is disposed at a position between the plurality of outer dummy rods 16o in the arrangement direction Dl.

[0108] In this embodiment, by configuring the tube bundle protection member 15 with a plurality of dummy rods 16 in a staggered arrangement, it is possible to ensure spacing between the plurality of dummy rods 16 while narrowing the gaps between the plurality of dummy rods 16 when viewing the plurality of dummy rods 16 in the deployment areas 50, 50a, 50b from the side opposite to the side where one or more heat transfer tube groups 11 are present, with the deployment areas 50, 50a, 50b as the reference. Therefore, in this embodiment, steam is permitted to pass through while foreign matter is efficiently prevented from passing through.

[0109] (9) The condensers 10, 10a, and 10b in the ninth aspect are In the condenser 10, 10a, 10b in the eighth aspect, the inter-rod angle formed by a line segment connecting the rod central axis Ar of one of the plurality of inner dummy rods 16i to the rod central axis Ar of one of the plurality of outer dummy rods 16o that is adjacent to the one of the inner dummy rods 16i on one side of the arrangement direction Dl with respect to a line segment connecting the rod central axis Ar of the one of the inner dummy rods 16i to the rod central axis Ar of another of the plurality of outer dummy rods 16o that is adjacent to the one of the inner dummy rods 16i on the other side of the arrangement direction Dl is 60° or more.

[0110] The narrower the inter-row distance between the row of the outer dummy rods 16o and the row of the inner dummy rods 16i in the direction perpendicular to the arrangement direction Dl, the larger the inter-rod angle becomes. In this embodiment, the inter-rod angle is set to 60° or more, and the inter-row distance is narrowed, which allows steam to pass through and efficiently prevents foreign matter flying from various directions from passing through.

[0111] (10) The condensers 10, 10a, and 10b in the tenth aspect are In the condenser 10, 10a, 10b according to the ninth aspect, the inter-rod angle is 90° or more.

[0112] In this embodiment, the angle between the rods is set to 90° or more and the distance between the rows is narrowed, allowing steam to pass through while efficiently suppressing the passage of foreign matter flying in from various directions.

[0113] (11) The condenser 10, 10a, 10b in the eleventh aspect is In the condenser 10, 10a, 10b according to any one of the eighth to tenth embodiments, the plurality of dummy rods 16 have the same outer diameter. In the arrangement direction Dl, the distance dl between the rod central axes Ar of the plurality of outer dummy rods 16o is 2.4 times or less the outer diameter. In the arrangement direction Dl, the distance dl between the rod central axes Ar of the plurality of inner dummy rods 16i is 2.4 times or less the outer diameter. In an inter-row direction Dr, which is perpendicular to the arrangement direction Dl and in which a row of the plurality of inner dummy rods 16i exists relative to a row of the plurality of outer dummy rods 16o, the distance dr between the rod central axis Ar of each of the plurality of outer dummy rods 16o and the rod central axis Ar of each of the plurality of inner dummy rods 16i is 1.2 times or less the outer diameter.

[0114] In this embodiment, the passage of foreign matter flying from various directions can be further suppressed while allowing the passage of steam.

[0115] (12) The condenser 10, 10a in the twelfth aspect is In the condenser 10, 10a according to any one of the first to eleventh aspects, the main steam inflow direction Dms and the second side direction Ds2 are both directions having a horizontal component.

[0116] In this embodiment, even if the steam turbine 2 that exhausts steam to the condenser 10, 10a is an axial exhaust type or a side exhaust type, it is possible to prevent the multiple heat transfer tubes 12 that make up each of the one or more heat transfer tube groups 11 from being soiled or damaged.

[0117] (13) The condenser 10, 10a in the thirteenth aspect is In the condenser 10, 10a according to the twelfth aspect, the one or more heat transfer tube groups 11 include a plurality of heat transfer tube groups 11 arranged in a vertical direction. A water receiving tray 19 formed of a plate extending in the first lateral direction Ds1 and the second lateral direction Ds2 is provided between any two heat transfer tube groups 11 adjacent to each other in the vertical direction among the plurality of heat transfer tube groups 11.

[0118] In this embodiment, the water receiving tray 19 can prevent foreign matter moving in between the two heat transfer tube groups 11 from soiling or damaging the multiple heat transfer tube groups 11 that make up each of the two heat transfer tube groups 11. Furthermore, in this embodiment, by using the water receiving tray 19 instead of the multiple dummy rods 16, manufacturing costs can be reduced.

[0119] (14) The condenser 10b in the fourteenth aspect is In the condenser 10b according to any one of the first to eleventh aspects, the main steam inflow direction Dms and the first side direction Ds1 each have a vertical component.

[0120] In this embodiment, even if the steam turbine 2b that exhausts steam to the condenser 10b is a downward exhaust type, it is possible to prevent the multiple heat transfer tubes 12 that make up each of the one or more heat transfer tube groups 11 from being soiled or damaged. [Explanation of symbols]

[0121] 1: Boiler 2, 2b: Steam turbine 2c: Turbine casing 2i: Steam inlet 2o: Steam exhaust port 2r: Turbine rotor 3: Main steam line 4: Main steam valve 5: Bypass line 6: Bypass valve 7: Water supply line 8: Water supply pump 8 10, 10a, 10b: Condenser 11: Heat transfer tube group 11a: First heat exchanger tube group 11b: Second heat exchanger tube group 11c: Third heat exchanger tube group 11d: Fourth heat exchanger tube group 12: Heat transfer tube 14::Inner bypass pipe 14a:First vent 14b:Second blowhole 15: Pipe group protection member 16: Dummy stick 16i: Inner dummy rod 16o: Outer dummy rod 16x, 16xa: Steam port end dummy rod 16y, 16ya: Second side end dummy rod 19: Water tray 19a: First water tray 19b: Second water tray 19c: Third water tray 20, 20b: Torso 21,21b: First side plate 22,22b:Second side plate 30, 30b: Connecting body 31, 31b: First connection side plate 32,32b:Second connection side plate 33:Third connection side plate 34: Fourth connecting side plate 38: Steam vent 39: Steam outlet 40, 40b: Main body 41,41b: First main body side plate 42,42b:Second main body side plate 43:Third body side plate 43i: Inlet tube plate 44: Fourth body side plate 44o: Outlet tube plate 45: Main body steam vent forming plate 46, 46b: Steam port facing plate 47i: Entrance water chamber frame 47o: Exit water chamber frame 48: Main body steam vent 50,50a,50b: Deployment area 51: First side deployment area 52:Second side deployment area 53, 53a: Steam port side deployment area 53f: First steam port side deployment area 53s: Second steam port side deployment area 53m: Development area between tube groups 54f: First side corner development area 54s:Second side corner development area 54m: Intermediate corner development area A: Axis line Ap: pipe center axis Ar: Rod center axis Da: Axial direction Dau: Axis upstream side Dad: Downstream of the axis Dms: Main steam inflow direction Ds1: First side direction Ds2: Second side direction Dl: Arrangement direction Dr: Direction between rows Di1: First inclination direction Di2: Second tilt direction

Claims

1. one or more heat transfer tube groups each composed of a plurality of heat transfer tubes; an internal bypass pipe through which steam can flow in from the outside without passing through the steam turbine; a tube bundle protection member that allows steam to pass through but prevents foreign matter from passing through; a shell covering the one or more heat transfer tube groups, the tube group protection member, and the intra-shell bypass tube; Equipped with the shell includes a steam port through which steam exhausted from the steam turbine can flow in, a steam port facing plate that is disposed on an opposite side of the steam port with respect to the one or more heat transfer tube groups, and a plurality of side plates that extend from the steam port to the steam port facing plate, the plurality of side plates include a first side plate and a second side plate that face each other in a first side direction having a direction component perpendicular to a main steam inflow direction that is a direction in which the steam port opposing plate exists with respect to the steam port, the in-shell bypass pipe is disposed between the steam port and the one or more heat transfer tube groups in the main steam inflow direction, extends in a second lateral direction having a directional component perpendicular to both the main steam inflow direction and the first lateral direction, and is connected to the shell; the intra-body bypass pipe is formed with a plurality of ejection holes that can eject steam in the intra-body bypass pipe to at least one side of the first side plate side and the second side plate side within the body, the tube bank protection member is disposed in a deployment region including at least a side deployment region that expands in the main steam inflow direction and the second side direction, between one of the first side plate and the second side plate, which side plate from which the plurality of ejection holes eject steam, and the one or more heat transfer tube groups. Condenser.

2. 2. The condenser according to claim 1, the side deployment region is a region closer to the steam port in a region closer to the steam port facing plate than the in-body bypass pipe, a width of the side development region in the main steam inflow direction is 20% to 50% of a maximum dimension of the group of the one or more heat transfer tube groups in the main steam inflow direction. Condenser.

3. 2. The condenser according to claim 1, the plurality of ejection holes include a plurality of first ejection holes capable of ejecting steam in the intra-body bypass pipe toward the first side plate, and a plurality of second ejection holes capable of ejecting steam in the intra-body bypass pipe toward the second side plate, the side development region includes a first side development region that spreads in the main steam inflow direction and the second side direction between the one or more heat transfer tube groups and the first side plate, and a second side development region that spreads in the main steam inflow direction and the second side direction between the one or more heat transfer tube groups and the second side plate. Condenser.

4. 2. The condenser according to claim 1, the deployment region includes a steam port side deployment region which extends in the first side direction and the second side direction between the in-body bypass pipe and the one or more heat transfer tube groups. Condenser.

5. The condenser according to claim 3, the deployment region includes a steam port side deployment region which extends in the first side direction and the second side direction between the in-body bypass pipe and the one or more heat transfer tube groups, a position of an end of the first-side deployment region on the steam port side and a position of an end of the second-side deployment region on the steam port side are closer to the steam port facing plate than the steam port side deployment region, the deployment region includes a first side corner deployment region between an end of the first side deployment region on the steam port side and an end of the steam port side deployment region on the first side plate side, and a second side corner deployment region between an end of the second side deployment region on the steam port side and an end of the steam port side deployment region on the second side plate side, the first side angle development region is a region that extends in a first inclination direction including a component in the first side direction and a component in the main steam inflow direction, and in the second side direction, The second side angle development region is a region that extends in a second inclination direction including a component in the first side direction and a component in the main steam inflow direction, and in the second side direction. Condenser.

6. 2. The condenser according to claim 1, the one or more heat transfer tubes include a group of a plurality of heat transfer tubes arranged in the first side direction, the deployment region includes an inter-tube group deployment region that expands in the main steam inflow direction and the second side direction between any two heat transfer tube groups adjacent to each other in the first side direction among the plurality of heat transfer tube groups. Condenser.

7. The condenser according to any one of claims 1 to 6, The tube bundle protection member includes a plurality of dummy rods extending in the second side direction and spaced apart from one another. Condenser.

8. The condenser according to claim 7, The plurality of dummy rods includes a plurality of outer dummy rods and a plurality of inner dummy rods, The plurality of outer dummy rods are arranged at intervals from one another in an arrangement direction perpendicular to the second side direction in a direction in which the deployment area expands, the plurality of inner dummy rods are arranged at intervals from one another in the arrangement direction on the side of the one or more heat transfer tube groups relative to the plurality of outer dummy rods, In the arrangement direction, any one of the plurality of inner dummy rods is disposed at a position between the plurality of outer dummy rods. Condenser.

9. 9. The condenser according to claim 8, With respect to a line segment connecting the rod central axis of one of the plurality of inner dummy rods and the rod central axis of one of the plurality of outer dummy rods adjacent to the one of the inner dummy rods on one side of the arrangement direction, an inter-rod angle formed by a line segment connecting the rod central axis of one of the inner dummy rods and the rod central axis of another of the plurality of outer dummy rods adjacent to the one of the inner dummy rods on the other side of the arrangement direction is 60° or more; Condenser.

10. 10. The condenser according to claim 9, The angle between the rods is 90° or more. Condenser.

11. 9. The condenser according to claim 8, The plurality of dummy rods have the same outer diameter, a distance between the central axes of the outer dummy rods in the arrangement direction is 2.4 times or less the outer diameter; a distance between the respective rod central axes of the plurality of inner dummy rods in the arrangement direction is 2.4 times or less the outer diameter; a distance between the rod central axis of each of the outer dummy rods and the rod central axis of each of the inner dummy rods in a direction perpendicular to the arrangement direction and in which a row of the inner dummy rods is present relative to a row of the outer dummy rods is 1.2 times or less the outer diameter; Condenser.

12. The condenser according to any one of claims 1 to 6, The main steam inflow direction and the second side direction both have a horizontal component. Condenser.

13. 13. The condenser according to claim 12, the one or more heat transfer tube groups include a plurality of heat transfer tube groups arranged in a vertical direction, a water receiving tray formed of a plate extending in the first side direction and the second side direction is provided between any two heat transfer tube groups adjacent to each other in the vertical direction among the plurality of heat transfer tube groups; Condenser.

14. The condenser according to any one of claims 1 to 6, The main steam inflow direction and the first side direction both have a vertical component. Condenser.

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