condenser

Abstract

This condenser comprises a plurality of heat transfer pipes, an in-body bypass pipe, and a body. The in-body bypass pipe is disposed between an exhaust steam port and a heat transfer pipe group consisting of the plurality of heat transfer pipes disposed in the body. The in-body bypass pipe includes a bypass pipe main body and an inspection nozzle connected to the bypass pipe main body. The bypass pipe main body extends in a pipe extension direction, and has a base end portion, which is one end portion in the pipe extension direction, that is connected to the body, and a tip end portion, which is the other end portion in the pipe extension direction, that is sealed. The bypass pipe main body has a plurality of steam ejection holes arranged in the pipe extension direction between the base end portion and the tip end portion. The inspection nozzle includes: an inspection nozzle pipe having one end connected to the bypass pipe main body so as to communicate with the inside of the bypass pipe main body; and a lid closing the other end of the inspection nozzle pipe.

Description

TECHNICAL FIELD

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

[0002] Priority is claimed on Japanese Patent Application No. 2023-083940 filed on May 22, 2023, the content of which is incorporated herein by reference.BACKGROUND ART

[0003] In general, a steam turbine plant includes a boiler that generates steam, a steam turbine that can be driven by the steam, a condenser that converts the steam exhausted from the steam turbine back into water, a main steam line that guides the steam from the boiler to the steam turbine, and a bypass line that branches from the main steam line. The bypass line is connected to the condenser.

[0004] PTL 1 discloses a method for removing foreign matter in a boiler or in a main steam line. The bypass line of the plant described in PTL 1 includes an out-body bypass pipe that branches from a main steam line and that extends to a body of a condenser, and an in-body bypass pipe that is disposed in the condenser and that communicates with the out-body bypass pipe. In general, the bypass line serves roles such as directly guiding steam from the boiler to the condenser until a temperature of the steam generated by the boiler reaches a predetermined temperature and a pressure of the steam reaches a predetermined pressure in a case where the boiler is started. In the method described in PTL 1, the steam is supplied into the boiler that is stopped, and the steam is fed into the condenser via a part of the main steam line and the bypass line, so that the foreign matter in the boiler or in the main steam line is removed.CIATION LISTPatent Literature

[0005] [PTL 1] Japanese Unexamined Patent Application Publication No. 59-153005SUMMARY OF INVENTIONTechnical Problem

[0006] In the method described in PTL 1, the foreign matter accumulates in the in-body bypass pipe. In the method described in PTL 1, in a case where the steam from the boiler is fed to the condenser via the bypass line in a process of starting the boiler, the foreign matter in the in-body bypass pipe may be ejected from an inside of the in-body bypass pipe into the body of the condenser, and may contaminate or damage a heat transfer pipe.

[0007] Therefore, an object of the present disclosure is to provide a condenser capable of preventing foreign matter in an in-body bypass pipe from being ejected from the inside of the in-body bypass pipe into a body of the condenser to contaminate or damage a heat transfer pipe.Solution to Problem

[0008] A condenser as one aspect of an invention for achieving the above-described object includes a plurality of heat transfer pipes, an in-body bypass pipe, and a body that covers the plurality of heat transfer pipes and the in-body bypass pipe, in which the body has an exhaust steam port into which steam exhausted from a steam turbine is configured to flow, the in-body bypass pipe is disposed between a group of heat transfer pipes formed of the plurality of heat transfer pipes disposed in the body and the exhaust steam port, the in-body bypass pipe has a bypass pipe main body connected to the body such that steam not passing through the steam turbine is configured to flow in from an outside, and an inspection nozzle connected to the bypass pipe main body, the bypass pipe main body extends in a pipe extension direction, has a base end portion that is one end portion in the pipe extension direction and that is connected to the body, and has a distal end portion that is the other end portion in the pipe extension direction, the distal end portion being sealed, the bypass pipe main body has a plurality of steam ejection holes aligned in the pipe extension direction between the base end portion and the distal end portion, and the inspection nozzle has an inspection nozzle pipe connected to the bypass pipe main body such that one end is configured to communicate with an inside of the bypass pipe main body, and a lid that closes the other end of the inspection nozzle pipe.Advantageous Effects of Invention

[0009] According to one aspect of the present disclosure, it is possible to remove foreign matter from the inside of the in-body bypass pipe, and to prevent the foreign matter in the in-body bypass pipe from being ejected from the inside of the in-body bypass pipe into the body of the condenser to contaminate or damage the heat transfer pipe.BRIEF DESCRIPTION OF DRAWINGS

[0010] FIG. 1 is a system diagram of a steam turbine plant in one embodiment according to the present disclosure.

[0011] FIG. 2 is a cross-sectional view of a condenser according to one embodiment of the present disclosure.

[0012] FIG. 3 is a partial cross-sectional view of an in-body bypass pipe provided in the condenser according to one embodiment of the present disclosure.

[0013] FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3.DESCRIPTION OF EMBODIMENTS

[0014] Hereinafter, one embodiment of a condenser and a modification example of the condenser according to the present disclosure will be described with reference to the drawings.Embodiment of Consider

[0015] As shown in FIG. 1, a steam turbine plant 1 mainly includes a steam generator 2, a steam turbine 3, a condenser 5, a feed-water pump 6, a main steam line 11, a supply water line 12, and a bypass line 13.

[0016] The steam generator 2 is a boiler or the like and generates steam. The steam turbine 3 is driven by the steam generated by the steam generator 2 to operate a generator (not shown) or the like. The condenser 5 condenses the steam exhausted from the steam turbine 3. The feed-water pump 6 returns the water condensed in the condenser 5 to the steam generator 2.

[0017] The main steam line 11 connects the steam generator 2 and the steam turbine 3. The steam generated by the steam generator 2 is supplied to the steam turbine 3 through the main steam line 11. A steam check valve 15 is provided in the main steam line 11. The steam check valve 15 opens and closes a flow path in the main steam line 11. The steam check valve 15 is capable of intermittently supplying the steam generated in the steam generator 2 through the main steam line 11.

[0018] The supply water line 12 connects the condenser 5 and the steam generator 2. The feed-water pump 6 is provided in the middle of the supply water line 12. The water converted from the steam back into liquid in the condenser 5 is supplied to the steam generator 2 through the supply water line 12 by the feed-water pump 6.

[0019] The bypass line 13 is provided to branch from the main steam line 11 and bypass the steam turbine 3. That is, one end of the bypass line 13 is connected to a position upstream of the steam check valve 15 in the main steam line 11. The bypass line 13 has an out-body bypass pipe 17 and an in-body bypass pipe 8.

[0020] The out-body bypass pipe 17 is provided outside the condenser 5. One end of the out-body bypass pipe 17 is connected to a position upstream of the steam check valve 15 in the main steam line 11. The other end of the out-body bypass pipe 17 is connected to a body 51 of the condenser 5 to be described later. A bypass valve 16 capable of opening and closing a flow path in the out-body bypass pipe 17 is provided in the middle of the out-body bypass pipe 17. The in-body bypass pipe 8 is inserted into the condenser 5 as will be described in detail later. The in-body bypass pipe 8 is connected to the other end of the out-body bypass pipe 17.

[0021] The steam turbine 3 includes a rotor (not shown) and a casing 31 that covers the rotor. The rotor (not shown) rotates in the casing 31. The rotor is connected to a rotor of a generator (not shown). The rotor is rotationally driven around a central axis by the steam supplied from the main steam line 11 into the casing 31.

[0022] FIG. 2 is a cross-sectional view showing a configuration of a condenser according to one embodiment of the present disclosure.

[0023] As shown in FIG. 2, the condenser 5 includes the body 51, a group of heat transfer pipes 52 formed of a plurality of heat transfer pipes 53, and the in-body bypass pipe 8.

[0024] Steam ST exhausted from the steam turbine 3 flows into the body 51. The body 51 extends in a vertical direction. The body 51 is formed to cover the plurality of heat transfer pipes 53 and the in-body bypass pipe 8. An exhaust steam port 54 into which the steam ST exhausted from the casing 31 of the steam turbine 3 is configured to flow is formed in an upper portion of the body 51. In the present embodiment, the exhaust steam port 54 is open upward from the inside of the body 51. That is, the steam turbine 3 is a downflow exhaust type that exhausts the steam ST downward.

[0025] An inlet water chamber 55A and an outlet water chamber 55B are formed in an intermediate portion of the body 51 in the vertical direction. The inlet water chamber 55A and the outlet water chamber 55B are formed on one side and the other side of the body 51 in a horizontal direction. The inlet water chamber 55A is formed on an inner side of a first diameter-increasing body 51c1 in which a part of the body 51 extending in the vertical direction is increased in diameter to protrude to one side in the horizontal direction. The outlet water chamber 55B is formed on an inner side of a second diameter-increasing body 51c2 in which a part of the body 51 extending in the vertical direction is increased in diameter to protrude to the other side in the horizontal direction.

[0026] The group of heat transfer pipes 52 is disposed at the intermediate portion of the body 51 in the vertical direction. The group of heat transfer pipes 52 includes the plurality of heat transfer pipes 53. The plurality of heat transfer pipes 53 are essentially parallel to each other. Each of the plurality of heat transfer pipes 53 extends in the horizontal direction. A direction in which the heat transfer pipes 53 extend is referred to as a pipe extension direction De. In each of the plurality of heat transfer pipes 53, an end portion on one side in the pipe extension direction De is supported by a first pipe plate 57A. In each of the plurality of heat transfer pipes 53, an end portion on the other side in the pipe extension direction De is supported by a second pipe plate 57B.

[0027] The first pipe plate 57A and the second pipe plate 57B are plates that extend in a direction essentially perpendicular to the pipe extension direction De. The first pipe plate 57A is provided in the first diameter-increasing body 51c1. The second pipe plate 57B is provided in the second diameter-increasing body 51c2. Each of the first pipe plate 57A and the second pipe plate 57B is formed with a plurality of pipe holes through which the plurality of heat transfer pipes 53 are inserted. Both end portions of each heat transfer pipe 53 in the pipe extension direction De are inserted into the pipe hole and supported by the first pipe plate 57A and the second pipe plate 57B. End portions of the plurality of heat transfer pipes 53 on one side in the pipe extension direction De penetrate the first pipe plate 57A and are open to communicate with the inlet water chamber 55A. The end portions of the plurality of heat transfer pipes 53 on the other side in the pipe extension direction De penetrate the second pipe plate 57B and are open to communicate with the outlet water chamber 55B.

[0028] Cooling water supplied from the outside of the condenser 5 flows through the plurality of heat transfer pipes 53 forming the group of heat transfer pipes 52. The cooling water is supplied from the outside of the condenser 5 into the inlet water chamber 55A. The cooling water supplied into the inlet water chamber 55A flows into the plurality of heat transfer pipes 53 from the end portion on one side in the pipe extension direction De, and flows out into the outlet water chamber 55B from the end portion on the other side in the pipe extension direction De. The water in the outlet water chamber 55B is discharged to the outside of the condenser 5 through a drain port (not shown).

[0029] The steam ST exhausted into the body 51 from the exhaust steam port 54 is cooled and condensed by coming into contact with outer surfaces of the plurality of heat transfer pipes 53 forming the group of heat transfer pipes 52.

[0030] A hot well 56 is formed below the group of heat transfer pipes 52 in the body 51. The hot well 56 stores water W in which the steam ST is condensed to become a liquid. An upstream end of the supply water line 12 is connected to a bottom portion of the body 51.

[0031] FIG. 3 is a partial cross-sectional view showing a configuration of an in-body bypass pipe provided in the condenser according to one embodiment of the present disclosure. FIG. 4 is a view showing a configuration of the in-body bypass pipe provided in the condenser in one embodiment according to the present disclosure, and is a cross-sectional view taken along line IV-IV in FIG. 3.

[0032] As shown in FIGS. 2 to 4, the in-body bypass pipe 8 is disposed between the group of heat transfer pipes 52 and the exhaust steam port 54 in the body 51. In the present embodiment, the in-body bypass pipe 8 is disposed above the group of heat transfer pipes 52 in the body 51. The in-body bypass pipe 8 is disposed below the exhaust steam port 54 in the body 51.

[0033] The in-body bypass pipe 8 integrally has a bypass pipe main body 81 and an inspection nozzle 83.

[0034] The bypass pipe main body 81 extends in the pipe extension direction De in the body 51. That is, in the present embodiment, the bypass pipe main body 81 extends parallel with the plurality of heat transfer pipes 53 forming the group of heat transfer pipes 52. The bypass pipe main body 81 may extend in a direction intersecting the plurality of heat transfer pipes 53 in a case where the bypass pipe main body 81 is viewed from above.

[0035] The bypass pipe main body 81 has a base end portion 81a and a distal end portion 81b. The base end portion 81a is one end portion of a tubular portion 811 of the bypass pipe main body 81 in the pipe extension direction De. As shown in FIG. 2, the base end portion 81a is connected to the body 51 by welding or the like. The bypass pipe main body 81 communicates with the other end of the out-body bypass pipe 17 through a through-hole formed in the body 51 at the base end portion 81a. The bypass pipe main body 81 integrally has the tubular portion 811 and a mirror plate portion 812. The tubular portion 811 is formed in a cylindrical shape extending in the pipe extension direction De.

[0036] The mirror plate portion 812 closes and seals the distal end portion 81b, which is the other end portion of the tubular portion 811 in the pipe extension direction De. The mirror plate portion 812 is formed in, for example, a hemispherical shape.

[0037] The distal end portion 81b of the bypass pipe main body 81 is not connected to the body 51. The distal end portion 81b is disposed at an interval in the horizontal direction with respect to an inner peripheral surface of the body 51. The distal end portion 81b of the bypass pipe main body 81 is sealed by the mirror plate portion 812. In the bypass pipe main body 81, the steam ST that does not pass through the steam turbine 3 is configured to flow from the outside through the bypass line 13.

[0038] The bypass pipe main body 81 has a plurality of steam ejection holes 85 between the base end portion 81a and the distal end portion 81b. The plurality of steam ejection holes 85 are arranged at intervals in the pipe extension direction De. In the present embodiment, two rows of the plurality of steam ejection holes 85 are provided at intervals in a circumferential direction (circumferential direction centered on the pipe extension direction De) of the bypass pipe main body 81. The number of the plurality of steam ejection holes 85 that are aligned in the pipe extension direction De and the number of rows in which the steam ejection holes 85 are aligned in the circumferential direction are not limited in any way.

[0039] Each steam ejection hole 85 is formed to penetrate the inside and outside of the bypass pipe main body 81. The plurality of steam ejection holes 85 eject the steam ST, which flows from the out-body bypass pipe 17 of the bypass line 13 into the bypass pipe main body 81, into the body 51. For this reason, it is preferable that the plurality of steam ejection holes 85 are formed to face obliquely downward or downward to eject the steam ST toward the group of heat transfer pipes 52 located below the in-body bypass pipe 8.

[0040] The bypass pipe main body 81 has a pipe extension portion 82 on the distal end portion 81b side. The pipe extension portion 82 secures, in the bypass pipe main body 81, an interval in the pipe extension direction De between a steam ejection hole 85s closest to the distal end portion 81b among the plurality of steam ejection holes 85 and the distal end portion 81b sealed by the mirror plate portion 812. It is preferable that a length L of the pipe extension portion 82 in the pipe extension direction De is three times or more an inner radius r of the bypass pipe main body 81.

[0041] The inspection nozzle 83 is provided to perform work such as checking an amount or the like of foreign matter D accumulated in the pipe extension portion 82 of the bypass pipe main body 81 and removing the foreign matter D accumulated in the pipe extension portion 82 of the bypass pipe main body 81. The inspection nozzle 83 is connected to the bypass pipe main body 81. The inspection nozzle 83 includes an inspection nozzle pipe 831 and a lid 832.

[0042] One end of the inspection nozzle pipe 831 is connected to the bypass pipe main body 81. The one end of the inspection nozzle pipe 831 can communicate with an inside of the bypass pipe main body 81 through a through-hole 81h formed in the bypass pipe main body 81. The inspection nozzle pipe 831 is provided at a position overlapping the pipe extension portion 82 in the pipe extension direction De. The inspection nozzle pipe 831 is connected to the pipe extension portion 82. The inspection nozzle pipe 831 extends obliquely upward from an upward-facing portion 81f1 of an outer peripheral surface 81f of the bypass pipe main body 81. In addition, the lid 832 closes the other end of the inspection nozzle pipe 831.

[0043] In the steam turbine plant 1 including the condenser 5 as described above, for example, while the steam generator 2 is activated, the steam check valve 15 is closed and the bypass valve 16 is opened until a temperature of the steam generated by the steam generator 2 reaches a predetermined temperature and a pressure of the steam reaches a predetermined pressure. In addition, even immediately after installation of the steam turbine plant 1, after completion of maintenance of the steam turbine plant 1, or the like, the steam check valve 15 is closed and the bypass valve 16 is opened to remove the foreign matter D. In this manner, the steam generated by the steam generator 2 is directly fed into the condenser 5 through the bypass line 13.

[0044] The steam flowing from the out-body bypass pipe 17 of the bypass line 13 into the bypass pipe main body 81 is introduced into the in-body bypass pipe 8. In a case where the steam introduced into the in-body bypass pipe 8 contains some foreign matter D, the foreign matter D flows in the bypass pipe main body 81 from the base end portion 81a side to the distal end portion 81b side together with the steam in the in-body bypass pipe 8. Among them, the steam is ejected into the body 51 from the plurality of steam ejection holes 85. On the other hand, since the foreign matter D has a mass, most of the foreign matter D continues to move in the bypass pipe main body 81 in the pipe extension direction De due to inertia and reaches the pipe extension portion 82 on the distal end portion 81b side. Since the length L of the pipe extension portion 82 is three times or more the inner radius r of the bypass pipe main body 81 and has a sufficient length, the foreign matter D accumulated in the pipe extension portion 82 is unlikely to return to a region where the plurality of steam ejection holes 85 are formed.Operations and Effects

[0045] In the above-described embodiment, the inspection nozzle 83 connected to the bypass pipe main body 81 is provided. Accordingly, even in a case where the foreign matter D is accumulated in the bypass pipe main body 81, the foreign matter D in the bypass pipe main body 81 can be removed from the bypass pipe main body 81 via the inspection nozzle pipe 831 by removing the lid 832 from the inspection nozzle pipe 831. Therefore, it is possible to prevent foreign matter in the in-body bypass pipe from being ejected from the inside of the in-body bypass pipe into the body of the condenser to contaminate or damage the heat transfer pipe. In addition, the foreign matter D can be removed from the inside of the in-body bypass pipe 8, and discharge of the steam from the inside of the in-body bypass pipe 8 into the body 51 of the condenser 5 can be prevented from being hindered by the foreign matter D.

[0046] In addition, in the above-described embodiment, the bypass pipe main body 81 has the pipe extension portion 82 between the steam ejection hole 85 closest to the distal end portion 81b among the plurality of steam ejection holes 85 and the distal end portion 81b, and the inspection nozzle pipe 831 is connected to the pipe extension portion 82.

[0047] According to such a configuration, the steam flows from the base end portion 81a toward the distal end portion 81b in the bypass pipe main body 81. For this reason, most of the foreign matter D mixed in the steam ST is accumulated on the side of the distal end portion 81b in the bypass pipe main body 81. Therefore, in the present aspect, most of the foreign matter D is accumulated from the pipe extension portion 82 to the distal end portion 81b in the bypass pipe main body 81. In the present aspect, since the inspection nozzle pipe 831 is connected to the pipe extension portion 82, the foreign matter D in the bypass pipe main body 81 can be efficiently removed via the inspection nozzle pipe 831.

[0048] Further, in the above-described embodiment, the length L of the pipe extension portion 82 is three times or more the inner radius r of the bypass pipe main body 81.

[0049] According to such a configuration, since the foreign matter D has a mass, most of the foreign matter D continues to move in the bypass pipe main body 81 in the pipe extension direction De due to inertia and reaches the pipe extension portion 82 on the distal end portion 81b side. Since the length L of the pipe extension portion 82 is three times or more the inner radius r of the bypass pipe main body 81 and has a sufficient length, the foreign matter D accumulated in the pipe extension portion 82 is unlikely to return to the region where the plurality of steam ejection holes 85 are formed. Therefore, it is possible to prevent the steam ejection hole 85 from being blocked by the foreign matter D.

[0050] In addition, in the above-described embodiment, the inspection nozzle pipe 831 extends obliquely upward from the upward-facing portion 81f1 of the outer peripheral surface 81f of the bypass pipe main body 81.

[0051] In such a configuration, the foreign matter D accumulates in a lower portion of the bypass pipe main body 81. In the present aspect, the inspection nozzle pipe 831 extends obliquely upward from the upward-facing portion of the outer peripheral surface of the bypass pipe main body 81. Therefore, visibility of the foreign matter D accumulated in the bypass pipe main body 81 can be improved, and removal work of the foreign matter D can be easily performed.Other Modification Example

[0052] In the above-described embodiment, the condenser 5 is of a downflow exhaust type in which the steam turbine 3 exhausts steam downward, and the condenser 5 is disposed below the steam turbine 3. However, the present disclosure is not limited thereto. The steam turbine 3 may exhaust steam in the horizontal direction, and the condenser 5 may be provided to be aligned with the steam turbine 3 in the horizontal direction.

[0053] In addition, the present disclosure is not limited to the embodiments described above. Various additions, modifications, substitutions, partial deletions, and the like can be made without departing from the conceptual idea and gist of the present invention derived from the contents defined in the claims and equivalents thereof.Supplementary Notes

[0054] For example, the condenser in the above-described embodiment and modification example is understood as follows.

[0055] (1) A condenser 5 according to a first aspect includes a plurality of heat transfer pipes 53, an in-body bypass pipe 8, and a body 51 that covers the plurality of heat transfer pipes 53 and the in-body bypass pipe 8, in which the body 51 has an exhaust steam port 54 into which steam exhausted from a steam turbine 3 is configured to flow, the in-body bypass pipe 8 is disposed between a group of heat transfer pipes 52 formed of the plurality of heat transfer pipes 53 disposed in the body 51 and the exhaust steam port 54, the in-body bypass pipe 8 has a bypass pipe main body 81 connected to the body 51 such that steam not passing through the steam turbine 3 is configured to flow in from an outside, and an inspection nozzle 83 connected to the bypass pipe main body 81, the bypass pipe main body 81 extends in a pipe extension direction De, has a base end portion 81a that is one end portion in the pipe extension direction De and that is connected to the body 51, and has a distal end portion 81b that is the other end portion in the pipe extension direction De, the distal end portion 81b being sealed, the bypass pipe main body 81 has a plurality of steam ejection holes 85 aligned in the pipe extension direction De between the base end portion 81a and the distal end portion 81b, and the inspection nozzle 83 has an inspection nozzle pipe 831 connected to the bypass pipe main body 81 such that one end is configured to communicate with an inside of the bypass pipe main body 81, and a lid 832 that closes the other end of the inspection nozzle pipe 831.

[0056] In the condenser 5 according to the present aspect, even in a case where the foreign matter D is accumulated in the bypass pipe main body 81, the foreign matter D in the bypass pipe main body 81 can be removed from the bypass pipe main body 81 via the inspection nozzle pipe 831 by removing the lid 832 from the inspection nozzle pipe 831. Therefore, it is possible to prevent foreign matter in the in-body bypass pipe from being ejected from the inside of the in-body bypass pipe into the body of the condenser to contaminate or damage the heat transfer pipe. In addition, the foreign matter D can be removed from the inside of the in-body bypass pipe 8, and the discharge of the steam from the inside of the in-body bypass pipe 8 into the body 51 of the condenser 5 can be prevented from being hindered by the foreign matter D.

[0057] (2) The condenser 5 according to a second aspect is the condenser 5 according to (1), in which the bypass pipe main body 81 has a pipe extension portion 82 that secures an interval in the pipe extension direction De between a steam ejection hole 85 closest to the distal end portion 81b among the plurality of steam ejection holes 85 and the sealed distal end portion 81b, and the inspection nozzle pipe 831 is connected to the pipe extension portion 82.

[0058] Accordingly, the steam flows from the base end portion 81a toward the distal end portion 81b in the bypass pipe main body 81. For this reason, most of the foreign matter D mixed in the steam is accumulated on the side of the distal end portion 81b in the bypass pipe main body 81. Therefore, in the present aspect, most of the foreign matter D is accumulated from the pipe extension portion 82 to the distal end portion 81b in the bypass pipe main body 81. In the present aspect, since the inspection nozzle pipe 831 is connected to the pipe extension portion 82, the foreign matter D in the bypass pipe main body 81 can be efficiently removed via the inspection nozzle pipe 831.

[0059] (3) The condenser 5 according to a third aspect is the condenser 5 according to (2), in which a length L of the pipe extension portion 82 in the pipe extension direction De is three times or more an inner radius r of the bypass pipe main body 81.

[0060] As a result, since the foreign matter D has a mass, most of the foreign matter D continues to move in the bypass pipe main body 81 in the pipe extension direction De due to inertia and reaches the pipe extension portion 82 on the distal end portion 81b side. Since the length L of the pipe extension portion 82 is three times or more the inner radius r of the bypass pipe main body 81 and has a sufficient length, the foreign matter D accumulated in the pipe extension portion 82 is unlikely to return to the region where the plurality of steam ejection holes 85 are formed. Therefore, it is possible to prevent the steam ejection hole 85 from being blocked by the foreign matter D.

[0061] (4) The condenser 5 according to a fourth aspect is the condenser 5 according to any one of (1) to (3), in which the inspection nozzle pipe 831 extends obliquely upward from an upward-facing portion 81f1 of an outer peripheral surface 81f of the bypass pipe main body 81.

[0062] The foreign matter D accumulates in a lower portion of the bypass pipe main body 81. In the present aspect, the inspection nozzle pipe 831 extends obliquely upward from the upward-facing portion of the outer peripheral surface of the bypass pipe main body 81. Therefore, visibility of the foreign matter D accumulated in the bypass pipe main body 81 can be improved, and removal work of the foreign matter D can be easily performed.INDUSTRIAL APPLICABILITY

[0063] According to one aspect of the present disclosure, it is possible to remove foreign matter from the inside of the in-body bypass pipe, and to prevent the foreign matter in the in-body bypass pipe from being ejected from the inside of the in-body bypass pipe into the body of the condenser to contaminate or damage the heat transfer pipe.REFERENCE SIGNS LIST1: steam turbine plant

[0065] 2: steam generator

[0066] 3: steam turbine

[0067] 5: condenser

[0068] 6: feed-water pump

[0069] 8: in-body bypass pipe

[0070] 11: main steam line

[0071] 12: supply water line

[0072] 13: bypass line

[0073] 15: steam check valve

[0074] 16: bypass valve

[0075] 17: out-body bypass pipe

[0076] 31: casing

[0077] 51: body

[0078] 51c1: first diameter-increasing body

[0079] 51c2: second diameter-increasing body

[0080] 52: group of heat transfer pipes

[0081] 53: heat transfer pipe

[0082] 54: exhaust steam port

[0083] 55A: inlet water chamber

[0084] 55B: outlet water chamber

[0085] 56: hot well

[0086] 57A: first pipe plate

[0087] 57B: second pipe plate

[0088] 81: bypass pipe main body

[0089] 81a: base end portion

[0090] 81b: distal end portion

[0091] 81f: outer peripheral surface

[0092] 81f1: portion

[0093] 81h: through-hole

[0094] 82: pipe extension portion

[0095] 83: inspection nozzle

[0096] 85, 85s: steam ejection hole

[0097] 811: tubular portion

[0098] 812: mirror plate portion

[0099] 831: inspection nozzle pipe

[0100] 832: lid

[0101] De: pipe extension direction

[0102] ST: steam

[0103] W: water

[0104] r: inner radius

Claims

1. A condenser comprising:a plurality of heat transfer pipes;an in-body bypass pipe; anda body that covers the plurality of heat transfer pipes and the in-body bypass pipe,wherein the body has an exhaust steam port into which steam exhausted from a steam turbine is configured to flow,the in-body bypass pipe is disposed between a group of heat transfer pipes formed of the plurality of heat transfer pipes disposed in the body and the exhaust steam port,the in-body bypass pipe hasa bypass pipe main body connected to the body such that steam not passing through the steam turbine is configured to flow in from an outside, andan inspection nozzle connected to the bypass pipe main body,the bypass pipe main body extends in a pipe extension direction, has a base end portion that is one end portion in the pipe extension direction and that is connected to the body, and has a distal end portion that is the other end portion in the pipe extension direction, the distal end portion being sealed,the bypass pipe main body has a plurality of steam ejection holes aligned in the pipe extension direction between the base end portion and the distal end portion, andthe inspection nozzle has an inspection nozzle pipe connected to the bypass pipe main body such that one end is configured to communicate with an inside of the bypass pipe main body, and a lid that closes the other end of the inspection nozzle pipe.

2. The condenser according to claim 1,wherein the bypass pipe main body has a pipe extension portion that secures an interval in the pipe extension direction between a steam ejection hole closest to the distal end portion among the plurality of steam ejection holes and the sealed distal end portion, andthe inspection nozzle pipe is connected to the pipe extension portion.

3. The condenser according to claim 2,wherein a length of the pipe extension portion in the pipe extension direction is three times or more an inner radius of the bypass pipe main body.

4. The condenser according to claim 1,wherein the inspection nozzle pipe extends obliquely upward from an upward-facing portion of an outer peripheral surface of the bypass pipe main body.

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