Trapping device, condensing apparatus and trapping method

Abstract

The trapping device is a device for trapping foreign matter mixed into the condensate of a steam turbine assembly. It comprises a first foreign matter trap and an in-condenser trap. The first foreign matter trap is located upstream of the condensate pump in the piping connecting the drain outlet at the bottom of the condenser and the condensate pump, and has an opening of a first size, allowing condensate to pass through while trapping foreign matter. The in-condenser trap is located inside the condenser and has an opening of a second size larger than the first size, allowing condensate inside the condenser to pass towards the drain outlet while trapping foreign matter.

Description

Technical Field

[0001] This invention relates to a collection device, a condensation device, and a collection method.

[0002] This application claims priority to Japanese Patent Application No. 2021-038720, filed on March 10, 2021 in Japan, the contents of which are incorporated herein by reference. Background Technology

[0003] Steam turbine systems typically include a boiler, a steam turbine driven by steam from the boiler, a condenser that converts steam discharged from the steam turbine back into water, a condensate pump, and piping that guides water from the condenser to the condensate pump. Sometimes, a foreign matter trap is installed on the piping connecting the condenser and the condensate pump to collect foreign matter contained in the condensate. For example, Patent Document 1 discloses a thermal power generation system in which a strainer is installed between the condenser and the condensate pump.

[0004] Previous technical documents

[0005] Patent documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2018-58019 Summary of the Invention

[0007] The technical problem to be solved by the invention

[0008] However, simply setting up a foreign object trap as described in Patent Document 1 has the following problems: when there are many foreign objects, the foreign object trap is prone to clogging, and the cleaning burden of the foreign object trap increases.

[0009] The present invention was made to solve the above-mentioned problems, and its purpose is to provide a collection device, condensation equipment and collection method that can reduce the cleaning burden.

[0010] means for solving technical problems

[0011] To address the aforementioned problems, the present invention provides a device for capturing foreign matter mixed into the condensate of a steam turbine assembly condenser. This device comprises a first foreign matter collector and a collector within the condenser. The first foreign matter collector is positioned upstream of the condensate pump in the piping connecting the drain outlet at the bottom of the condenser and the condensate pump, and has an opening of a first size, allowing condensate to pass through while capturing foreign matter. The collector within the condenser is located inside the condenser and has an opening of a second size larger than the first size, allowing condensate within the condenser to pass towards the drain outlet while capturing foreign matter.

[0012] To address the aforementioned problems, the condensation apparatus of the present invention includes a condenser and a collection device. The collection device is a means of collecting foreign matter mixed into the condensate of the condenser, and includes a first foreign matter collector and an in-condenser collector. The first foreign matter collector is located upstream of the condensate pump in the piping connecting the drain outlet at the bottom of the condenser and the condensate pump, and has an opening of a first size, allowing condensate to pass through while collecting foreign matter. The in-condenser collector is located inside the condenser and has an opening of a second size larger than the first size, allowing condensate inside the condenser to pass towards the drain outlet while collecting foreign matter.

[0013] To address the aforementioned problems, the present invention provides a method for capturing foreign matter mixed into the condensate of a steam turbine assembly. This method involves installing a first foreign matter collector and an in-condenser collector, and performing a boiler shutdown (blowing out) while both the first foreign matter collector and the in-condenser collector are in place. The first foreign matter collector is positioned upstream of the condensate pump in the piping connecting the drain outlet at the bottom of the condenser and the condensate pump, and has an opening of a first size, allowing condensate to pass through and capture foreign matter. The in-condenser collector is located inside the condenser and has an opening of a second size larger than the first size, allowing condensate inside the condenser to pass towards the drain outlet and capture foreign matter.

[0014] Invention Effects

[0015] The collection device, condensation equipment, and collection method according to the present invention can reduce the cleaning burden. Attached Figure Description

[0016] Figure 1 This is a diagram showing the structure of the steam turbine assembly according to the first embodiment of the present invention in its normal state.

[0017] Figure 2 This is a diagram illustrating the trapping device according to the first embodiment of the present invention.

[0018] Figure 3 This is a perspective view of the protective tube according to the first embodiment of the present invention.

[0019] Figure 4 This is a top view showing the condenser internal filter and protection tube according to the first embodiment of the present invention.

[0020] Figure 5 This is a flowchart illustrating the capture method according to the first embodiment of the present invention.

[0021] Figure 6This is a perspective view of the protective tube according to the first modified example of the first embodiment of the present invention.

[0022] Figure 7 This is a perspective view of the protective tube according to the second variation of the first embodiment of the present invention.

[0023] Figure 8 This is a perspective view of the protective tube according to the third modification of the first embodiment of the present invention.

[0024] Figure 9 This is a top view showing the protective tube according to the fourth variation of the first embodiment of the present invention.

[0025] Figure 10 This is a cross-sectional view showing a portion of the condensate piping according to the second embodiment of the present invention in its normal state.

[0026] Figure 11 This is a cross-sectional view showing a portion of the condensate piping according to the second embodiment of the present invention in a temporary state.

[0027] Figure 12 This is an enlarged cross-sectional view showing a portion of the temporary piping involved in the second embodiment of the present invention.

[0028] Figure 13 This is a flowchart illustrating the capture method according to the second embodiment of the present invention. Detailed Implementation

[0029] Hereinafter, the collection apparatus, condensation device, and collection method according to embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, structures having the same or similar functions will be labeled with the same reference numerals. Furthermore, repeated descriptions of these structures will sometimes be omitted.

[0030] [First Implementation]

[0031] The following is for reference. Figures 1 to 4 The first embodiment of the present invention will be described.

[0032] (Structure of a complete steam turbine assembly)

[0033] First, the structure of the steam turbine assembly 1 according to the first embodiment will be described.

[0034] Figure 1This diagram illustrates the structure of the steam turbine assembly 1 according to the first embodiment in its normal operating state (operational state). The normal operating section A of the steam turbine assembly 1 includes, for example, a boiler 11, a steam turbine 12, a generator 13, a condenser 14, a pure water supply device 15, a main steam pipeline 21, a steam shut-off valve 22, a steam regulating valve 23, a condensate pipeline 25, a condensate pump 26, a condensate outlet valve 27, a feedwater pipeline 31, a feedwater pump 32, a feedwater regulating valve 33, a feedwater drain pipeline 35, a drainage treatment device 36, a feedwater drain valve 37, a steam bypass pipeline 41, and a bypass steam drain valve 42.

[0035] Boiler 11 heats water to generate steam. Steam turbine 12 has turbine rotor 12r and turbine casing 12c covering turbine rotor 12r. Steam from boiler 11 flows into turbine casing 12c. Turbine rotor 12r rotates due to the steam flowing into turbine casing 12c. The rotor of generator 13 is connected to turbine rotor 12r.

[0036] The condenser 14 is a device for cooling and condensing water vapor after the steam turbine 12 has produced work, thus restoring it to water. The condenser 14, for example, has a condenser shell 14c and a heat transfer tube assembly 14t disposed within the condenser shell 14c and consisting of multiple heat transfer tubes. The condenser shell 14c has a steam inlet opening 14ci that guides the steam discharged from the steam turbine 12 into its interior. A cooling medium for cooling the steam discharged from the steam turbine 12 flows through the multiple heat transfer tubes. The cooling medium is, for example, seawater or river water. The steam discharged from the steam turbine 12 is cooled by the cooling medium flowing through the heat transfer tubes and becomes water. Hereinafter, this water is sometimes referred to as condensate. A heat well 14ch is formed in the portion of the condenser shell 14c that is lower than the heat transfer tube assembly 14t. The condensate is stored in the heat well 14ch.

[0037] The pure water supply device 15 includes a pure water tank 16 for storing pure water, a pure water pipeline 17 for guiding the pure water stored in the pure water tank 16 into the condenser housing 14c, a pure water pump 18 installed on the pure water pipeline 17, and a pure water regulating valve 19 installed on the pure water pipeline 17 at a position closer to the condenser 14 than the pure water pump 18. If the amount of condensate in the condenser housing 14c decreases, the pure water regulating valve 19 is opened to replenish the condenser housing 14c with the pure water in the pure water tank 16 as condensate.

[0038] The main steam pipeline 21 connects the steam outlet of the boiler 11 and the steam inlet of the turbine housing 12c. A steam shut-off valve 22 is installed on the main steam pipeline 21 to prevent steam from flowing into the steam turbine 12, and a steam regulating valve 23 to regulate the flow rate of steam into the steam turbine 12.

[0039] The condensate pipe 25 connects the drain outlet 14d of the hot well 14ch of the condenser housing 14c to the suction inlet 26i of the condensate pump 26. A condensate outlet valve 27 is installed on the condensate pipe 25. The condensate pump 26 draws in the condensate flowing through the condensate pipe 25 and delivers the drawn-in condensate to the water supply pipe 31. Thus, the condensate pump 26 extracts condensate from the hot well 14ch of the condenser 14 and supplies the extracted condensate to the water supply pump 32.

[0040] The water supply line 31 connects the outlet of the condensate pump 26 and the water inlet of the boiler 11. A feed water pump 32 is installed on the water supply line 31 to pressurize the water from the condensate pump 26 and deliver it to the boiler 11. A feed water regulating valve 33 is installed on the water supply line 31, closer to the boiler 11 than the feed water pump 32, to regulate the flow rate of the water delivered to the boiler 11.

[0041] A water supply drain pipe 35 is connected to the water supply pipe 31, positioned closer to the condensate pump 26 than the water supply pump 32. A drainage treatment device 36 is connected to the end of the water supply drain pipe 35. The drainage treatment device 36 purifies the water flowing through the water supply pipe 31. The water supply drain pipe 35 is connected to the drainage treatment device 36 in a manner that communicates with the treated water receiving space within the drainage treatment device 36, which receives the water to be purified. A water supply drain valve 37 is installed on the water supply drain pipe 35.

[0042] Steam bypass line 41 branches off from the main steam line 21 at a position between the boiler 11 and the steam shut-off valve 22. Steam bypass line 41 is connected to the condenser 14. A bypass steam discharge valve 42 is installed on steam bypass line 41.

[0043] (Collection device)

[0044] Next, the collection device 50 installed in the steam turbine assembly 1 will be described. In the following description, "the interior of the condenser 14" refers to the interior of the condenser shell 14c, and "the bottom 14b of the condenser 14" refers to the bottom of the condenser shell 14c. In this embodiment, the condenser 14, the collection device 50, and the condensate piping 60 described later constitute the "condensing equipment CE".

[0045] Figure 2 This diagram illustrates the trapping device 50 according to the first embodiment. The trapping device 50 is a device for trapping foreign matter M mixed into the condensate of the condenser 14 of the steam turbine assembly 1. The trapping device 50 includes, for example, a condensate pump suction filter 51 and a condenser inlet trap 50c.

[0046] The condensate pump suction filter 51 is located midway through the condensate piping 60, which connects the drain outlet 14d at the bottom 14b of the condenser 14 to the suction inlet 26i of the condensate pump 26. The condensate piping 60 forms the condensate pipeline 25. The condensate pump suction filter 51 is positioned on the condensate piping 60 upstream of the condensate pump 26.

[0047] The condensate pump suction filter 51 is, for example, a collector having a plate member 51a and a plurality of openings 51h provided on the plate member 51a, through which condensate water passes while trapping foreign objects. The openings 51h have a first dimension of opening width. "Opening width" refers, for example, to the diameter when the opening is circular, and to the maximum width within the opening when the opening is polygonal. In other words, "opening width" refers to the maximum size of foreign objects that can pass through. The first dimension is, for example, less than 5 mm, and in one example, less than 1 mm.

[0048] By installing this condensate pump suction filter 51, foreign matter Ma larger than the first size contained in the condensate flowing through the condensate pipe 60 is captured by the condensate pump suction filter 51. That is, foreign matter Ma is stored upstream of the condensate pump suction filter 51. The foreign matter Ma captured by the condensate pump suction filter 51 is removed by backwashing the condensate pump suction filter 51 by a backwashing mechanism (not shown). The condensate pump suction filter 51 is, for example, a foreign matter collector commonly installed in a steam turbine assembly 1. The condensate pump suction filter 51 is an example of a "first foreign matter collector". The condensate pump suction filter 51 can also be called a "condenser external foreign matter collector".

[0049] The condenser trap 50c is a trap installed inside the condenser 14 that traps foreign objects by allowing the condensate in the condenser 14 to pass towards the drain outlet 14d. The condenser trap 50c includes, for example, an internal condenser filter 52 and a protective tube 53.

[0050] A condenser internal filter 52 is disposed inside the condenser 14 and covers the drain outlet 14d of the condenser 14 from above. The condenser internal filter 52 is a collector having multiple openings 52h that allow condensate to pass through while trapping foreign matter. The openings 52h have a second dimension in width. This second dimension is larger than the first dimension described above (the size of the opening 51h of the condensate pump suction filter 51). The second dimension is, for example, 1 mm or more, and in one example, 5 mm or more. Alternatively, the second dimension may be, for example, less than 10 mm.

[0051] In this embodiment, the condenser internal filter 52 has a cylindrical portion 52a formed by a cylindrical sidewall 52s and a canopy portion 52b covering the top of the cylindrical portion 52a. "Cylindrical" is not limited to a round cylinder; it can also be a angular cylindrical shape. This definition is also used in the protection tube 53 or the inertial collector 72 described later. The diameter of the cylindrical portion 52a is larger than the diameter of the drain outlet 14d of the condenser 14. The cylindrical portion 52a is fixed to the bottom 14b of the condenser 14, for example, by welding. Multiple openings 52h are respectively provided in the cylindrical portion 52a and the canopy portion 52b. That is, condensate in the condenser 14 flows into the drain outlet 14d through the multiple openings 52h provided in the cylindrical portion 52a and the multiple openings 52h provided in the canopy portion 52b. In this embodiment, the cylindrical portion 52a and the canopy portion 52b are formed of perforated metal plates.

[0052] The condenser filter 52 has a first height H1, which is the height from the bottom 14b of the condenser 14. In this embodiment, the first height H1 is the height from the bottom 14b of the condenser 14 to the upper surface of the canopy portion 52b.

[0053] By providing this condenser internal filter 52, foreign matter Mb larger than the second size contained in the condensate within the condenser 14 is captured by the condenser internal filter 52. That is, the foreign matter Mb is stored upstream of the condenser internal filter 52. The condenser internal filter 52 is, for example, a foreign matter trap commonly installed in a steam turbine assembly 1. The condenser internal filter 52 is an example of a "second foreign matter trap". The condenser internal filter 52 can also be referred to as a "first foreign matter trap inside the condenser".

[0054] A protective tube 53 is disposed at the bottom 14b of the condenser 14 and surrounds the filter 52 inside the condenser. The protective tube 53 has more than one opening 53h (see reference). Figure 3 This device allows condensate to pass through while trapping foreign objects. In this embodiment, the protective tube 53 has a cylindrical portion 53a formed by a cylindrical sidewall 53s. The cylindrical portion 53a surrounds the cylindrical portion 52a of the condenser inner filter 52. The cylindrical portion 53a is fixed to the bottom 14b of the condenser 14, for example, by welding. A gap S is provided between the inner circumferential surface of the cylindrical portion 53a and the outer circumferential surface of the cylindrical portion 52a of the condenser inner filter 52, through which condensate can flow. The top of the cylindrical portion 53a is open.

[0055] Figure 3This is a perspective view showing the protective tube 53. An opening 53h is provided in a portion of the circumferential direction of the cylindrical portion 53a and extends along the axial direction (vertical direction) of the cylindrical portion 53a. The opening 53h, for example, reaches the bottom 14b of the condenser 14. In this embodiment, the opening 53h is a slit extending from the upper end to the lower end of the cylindrical portion 53a. In other words, the protective tube 53 of this embodiment is formed by removing (e.g., cutting) a portion of the circumferential direction of a short tube. The opening 53h functions as a water passage gap that guides condensate present on the outer circumferential side of the protective tube 53 to the inner circumferential side of the protective tube 53.

[0056] Figure 4 This is a top view showing the condenser internal filter 52 and the protective tube 53. The opening 53h has a third dimension D3 in the circumferential direction of the cylindrical portion 53a. "Opening width" refers to the dimension in the direction orthogonal to the direction of opening extension when the opening extends in a straight line. The third dimension D3 is larger than the second dimension (the dimension of the opening 52h of the condenser internal filter 52) mentioned above. The third dimension D3 is, for example, 10 mm or more.

[0057] Return to Figure 2 The protective tube 53 will continue to be described. The protective tube 53 has a second height H2, which is the height from the bottom 14b of the condenser 14. In this embodiment, the second height H2 is the height from the bottom 14b of the condenser 14 to the upper end of the cylinder 53a. The second height H2 is higher than the first height H1 (the height of the internal filter 52 of the condenser).

[0058] By providing this protective tube 53, foreign matter Mc larger than the third dimension D3 contained in the condensate on the outer periphery of the protective tube 53 (e.g., foreign matter Mc stored at the bottom 14b of the condenser 14) is captured by the protective tube 53. That is, foreign matter Mc is stored on the outer periphery of the protective tube 53. The protective tube 53 is, for example, a temporary foreign matter trap. When there may be a large amount of foreign matter in the condensate within the condenser 14 (during shutdown, etc.), the protective tube 53 is provided in the steam turbine assembly 1. However, the protective tube 53 can also be a permanent foreign matter trap in the steam turbine assembly 1. The protective tube 53 is an example of a "third foreign matter trap". The protective tube 53 can also be referred to as a "second foreign matter trap within the condenser".

[0059] (Flowchart of the capture method)

[0060] Next, the process of the foreign object capture method according to the first embodiment will be described.

[0061] Figure 5This is a flowchart illustrating the process of the trapping method according to the first embodiment of the present invention. The trapping method of this embodiment is implemented, for example, after the construction or maintenance of the steam turbine assembly 1, when a large amount of foreign matter such as welding slag or grinding dust may remain in the piping or various machines. The trapping method of this embodiment includes, for example, a trapping device installation step (S11), a trial operation start-up step accompanying a boiler shutdown (S12), a protective pipe removal step (S13), and a business operation start-up step (S14).

[0062] In the process of setting up the trapping device (S11), the condensate pump suction filter 51 is installed in the condensate piping 60, and the condenser internal filter 52 and the protective pipe 53 are installed inside the condenser 14. This process of setting up the trapping device (S11) is carried out, for example, as part of the construction work of the steam turbine assembly 1.

[0063] The trial operation start-up process (S12) is performed after the trapping device installation process (S11). In the trial operation start-up process (S12), the trial operation of the steam turbine assembly 1 begins. As part of the trial operation start-up process (S12), the steam turbine assembly 1 is shut down. Shutdown is an operation to supply high-pressure gas (steam or air) to the piping of the steam turbine assembly 1 to remove foreign matter such as welding slag or grinding dust remaining in the piping or various machines. In the shutdown of this embodiment, for example, high-pressure gas is supplied to the main steam line 21 and the steam turbine 12 to guide foreign matter in the main steam line 21 and the steam turbine 12 to the condenser 14. Furthermore, in the shutdown of this embodiment, high-pressure gas is supplied to the steam bypass line 41 to guide foreign matter in the steam bypass line 41 to the condenser 14. Thus, foreign matter remaining in the main steam line 21, the steam turbine 12, and the steam bypass line 41 is guided to the condenser 14. The above-described shutdown procedure should be repeated multiple times as needed.

[0064] Foreign matter guided to condenser 14 flows towards condensate pump 26 along with the condensate inside condenser 14. As the foreign matter moves towards condensate pump 26, starting with larger objects, it is sequentially captured by the protective pipe 53, the condenser internal filter 52, and the condensate pump suction filter 51. Then, the protective pipe 53, the condenser internal filter 52, and the condensate pump suction filter 51 are cleaned. This removes foreign matter generated during the construction or maintenance of the steam turbine assembly 1.

[0065] The protective tube removal process (S13) is performed after the trial operation start process (S12). In the protective tube removal process (S13), the protective tube 53 is removed from the bottom 14b of the condenser 14. However, the protective tube 53 can also be used as a permanent foreign matter trap and is not removed from the condenser 14. In this case, the protective tube removal process (S13) is omitted.

[0066] The operation start-up process (S14) is performed after the protection pipe removal process (S13). In the operation start-up process (S14), the operation of the steam turbine assembly 1, which accompanies the generator 13 in generating electricity, begins. Foreign matter generated after the start of operation is captured by the condenser internal filter 52 and the condensate pump suction filter 51.

[0067] (Effects)

[0068] In the above-described trapping device 50 and trapping method, in addition to the condensate pump suction filter 51, foreign matter is also trapped by a condenser trap 50c installed inside the condenser 14. For example, by having a first size in the opening 51h of the condensate pump suction filter 51 and a second size in the opening of the condenser trap 50c that is larger than the first size, the condensate in the condenser 14 is smoothly guided to the drain outlet 14d, and at least a portion of the foreign matter that causes blockage of the condensate pump suction filter 51 is trapped inside the condenser 14, thereby preventing foreign matter from reaching the condensate pump suction filter 51. Thus, blockage of the condensate pump suction filter 51 can be prevented. As a result, the cleaning burden on the condensate pump suction filter 51 can be reduced.

[0069] Furthermore, from another perspective, by using the collection device 50 and collection method of this embodiment, clogging of the condensate pump suction filter 51 can be avoided, and foreign matter contained in the condensate within the condenser 14 can be collected. Therefore, as a shutdown method, for example, a method of blowing air into the condenser 14 can be adopted from the initial stage of shutdown. According to this shutdown method, for example, compared to shutting down the boiler by installing temporary piping containing an inertial collector in the main steam line 21 or steam bypass line 41, the number of shutdown procedures can be reduced. As a result, the construction or maintenance period of the steam turbine assembly 1 can be shortened.

[0070] In this embodiment, the condenser trap 50c includes a condenser filter 52 with an opening 52h of a second size and a protective tube 53 with an opening 53h of a third size larger than the second size. With this structure, foreign objects of different sizes are captured in order of size by the protective tube 53, the condenser filter 52, and the condensate pump suction filter 51. Therefore, clogging of the condenser filter 52 and the condensate pump suction filter 51 is less likely to occur. This further reduces the cleaning burden.

[0071] In this embodiment, the height H2 of the protective tube 53 relative to the bottom 14b of the condenser 14 is higher than the height H1 of the condenser inner filter 52 relative to the bottom 14b of the condenser 14. This structure further reduces the likelihood of foreign matter settling to the bottom 14b of the condenser 14 passing through the protective tube 53 and reaching the condenser inner filter 52. This further reduces the cleaning burden.

[0072] In this embodiment, the opening 53h of the protective tube 53 is located on the side wall 53s of the cylindrical portion 53a and extends to the bottom 14b of the condenser 14. With this structure, all condensate present on the outer periphery of the protective tube 53 can be drained. This avoids false detections by the water level sensor installed in the condenser 14 and improves the operability of maintenance and other work related to the condenser 14.

[0073] (Modified Example)

[0074] Next, several variations of the first embodiment will be described. In each variation, the structure other than the structure described below is the same as the structure of the first embodiment.

[0075] (First variation)

[0076] Figure 6 This is a perspective view showing the protective tube 53 involved in the first modified example. The opening 53h of the protective tube 53 in the first modified example is a notch provided at the upper end of the cylindrical portion 53a. By providing the opening 53h, a portion of the upper end of the cylindrical portion 53a becomes lower.

[0077] (Second variation)

[0078] Figure 7 This is a perspective view showing the protective tube 53 involved in the second modification. The opening 53h of the protective tube 53 in the second modification is a notch provided at the lower end of the cylindrical portion 53a. The opening 53h reaches the bottom 14b of the condenser 14. By providing the opening 53h, a connecting portion is formed between a portion of the lower end of the cylindrical portion 53a and the bottom 14b of the condenser 14, allowing communication between the inside and outside of the cylindrical portion 53a.

[0079] (3rd variation)

[0080] Figure 8 This is a perspective view showing the protective tube 53 involved in the third modification. The protective tube 53 of the third modification has one or more (e.g., multiple) openings 53h. In this modification, the opening 53h is a circular hole provided in the cylindrical portion 53a. The multiple openings 53h are arranged separately in the circumferential and vertical directions of the cylindrical portion 53a.

[0081] (4th variation)

[0082] Figure 9 This is a top view showing the protective tube 53 involved in the fourth modification. The protective tube 53 of the fourth modification has an opening 53h provided in the cylindrical portion 53a and a pair of protrusions 53ba, 53bb provided on both sides of the opening 53h. The protrusions 53ba, 53bb protrude from the outer peripheral side of the side wall 53s of the cylindrical portion 53a relative to the outer peripheral side of the cylindrical portion 53a. The protrusions 53ba, 53bb are provided, for example, along the entire height of the cylindrical portion 53a. The protrusions 53ba, 53bb prevent foreign matter M present on the outer peripheral side of the protective tube 53 from bypassing and flowing into the inner peripheral side of the protective tube 53 from the opening 53h. With this structure, clogging of the condenser internal filter 52 and the condensate pump suction filter 51 is less likely to occur.

[0083] [Second Implementation]

[0084] Next, refer to Figures 10 to 13 The second embodiment of the present invention will be described. The difference between the second and first embodiments is that the temporary section B of the steam turbine assembly 1A includes a temporary piping 70. The structure other than that described below is the same as in the first embodiment. In this embodiment, the "condensing equipment CEA" is constituted by the condenser 14, the collection device 50, and the condensate piping 60A. The condensate piping 60A is the piping that forms the condensate pipeline 25.

[0085] (Structure of condensing equipment)

[0086] Figure 10 This is a cross-sectional view showing a portion of the condensate piping 60A in its normal operating state. The normal section A of the steam turbine assembly 1A has a first connecting pipe 61, a second connecting pipe 62, and an elbow pipe 63 (hereinafter referred to as "normal elbow pipe 63" for distinction) as part of the condensate piping 25.

[0087] The first connecting pipe 61 is connected to the bottom 14b of the condenser 14 and communicates with the drain port 14d of the condenser 14. For example, the first connecting pipe 61 is positioned directly below the drain port 14d of the condenser 14. The first connecting pipe 61 extends downward from the bottom 14b of the condenser 14 (e.g., vertically downward). A connecting portion 61a is provided at the lower end (downstream end) of the first connecting pipe 61. The connecting portion 61a is, for example, a connecting seat that serves as a connecting flange.

[0088] The second connecting pipe 62 is located downstream of the permanent bend pipe 63. The second connecting pipe 62 is connected to the condensate pump 26 via the condensate pump suction filter 51. The second connecting pipe 62 extends horizontally. A connecting portion 62a is provided at the upstream end of the second connecting pipe 62. The connecting portion 62a is, for example, a connecting seat serving as a connecting flange.

[0089] A permanent bend in the piping 63 is disposed between the first connecting piping 61 and the second connecting piping 62, and is connected to both the first connecting piping 61 and the second connecting piping 62. The permanent bend in the piping 63, for example, has a first flow path portion 63a, a second flow path portion 63b, a bend portion 63c, a first connection portion 63d, and a second connection portion 63e. The permanent bend in the piping 63 is an example of a "permanent piping".

[0090] The first flow path portion 63a extends downward. "Extending downward" is not limited to extending vertically downward, but also includes extending diagonally downward. The first flow path portion 63a is positioned directly below the first connecting pipe 61 (i.e., directly below the drain outlet 14d of the condenser 14) and connected to the first connecting pipe 61. A first connecting portion 63d is provided at the upstream end of the first flow path portion 63a. The first connecting portion 63d is a connecting portion that can be installed onto the connecting portion 61a of the first connecting pipe 61. The first connecting portion 63d may be, for example, a connecting seat serving as a connecting flange.

[0091] The second flow path 63b is located downstream of the first flow path 63a. The second flow path 63b extends in a direction intersecting the first flow path 63a. In this embodiment, it extends horizontally in a direction orthogonal to the first flow path 63a. The second flow path 63b is connected to the second connecting pipe 62. A second connecting portion 63e is provided at the downstream end of the second flow path 63b. The second connecting portion 63e is a connecting portion that can be installed on the connecting portion 62a of the second connecting pipe 62. The second connecting portion 63e is, for example, a connecting seat that serves as a connecting flange.

[0092] The curved portion 63c is located between the first flow path portion 63a and the second flow path portion 63b. The curved portion 63c bends in the direction from the first flow path portion 63a toward the second flow path portion 63b. "Bending" is not limited to bending, but also includes bending into an arc shape. The curved portion 63c connects the first flow path portion 63a and the second flow path portion 63b.

[0093] Figure 11 This is a cross-sectional view showing a portion of the condensate line 25 in a temporary state (e.g., during boiler shutdown). The temporary section B of the steam turbine assembly 1 has a temporary piping 70 as part of the condensate line 25. The temporary piping 70 is installed between the first connecting piping 61 and the second connecting piping 62, replacing the permanent bend piping 63. The temporary piping 70 includes, for example, a bend piping 71 (hereinafter referred to as "temporary bend piping 71" for distinction) and an inertia collector 72.

[0094] A temporary bend in the conduit 71 is provided between the first connecting conduit 61 and the second connecting conduit 62, replacing the bend in the conduit 63, and is connected to the first connecting conduit 61 and the second connecting conduit 62. The temporary bend in the conduit 71, for example, has a first flow path 71a, a second flow path 71b, a bend 71c, a first connection 71d, and a second connection 71e.

[0095] The first flow path 71a extends downward. For example, the first flow path 71a extends vertically downward in a straight line. The first flow path 71a is positioned directly below the first connecting pipe 61 (i.e., directly below the drain outlet 14d of the condenser 14) and is connected to the first connecting pipe 61. A first connecting portion 71d is provided at the upstream end of the first flow path 71a. The first connecting portion 71d is a connecting portion that can be installed on the connecting portion 61a of the first connecting pipe 61. The first connecting portion 71d is, for example, a connecting seat that serves as a connecting flange.

[0096] The second flow path 71b is located downstream of the first flow path 71a. The second flow path 71b extends in a direction intersecting the first flow path 71a. In this embodiment, it extends horizontally in a direction orthogonal to the first flow path 71a. The second flow path 71b is connected to the second connecting pipe 62. A second connecting portion 71e is provided at the downstream end of the second flow path 71b. The second connecting portion 71e is a connecting portion that can be installed on the connecting portion 62a of the second connecting pipe 62. The second connecting portion 71e is, for example, a connecting seat that serves as a connecting flange.

[0097] The curved portion 71c is located between the first flow path portion 71a and the second flow path portion 71b. The curved portion 71c bends in the direction from the first flow path portion 71a toward the second flow path portion 71b. The curved portion 71c connects the first flow path portion 71a and the second flow path portion 71b. The lower end of the curved portion 71c has an opening 71f that opens downwards.

[0098] The inertial collector 72 branches off from the bend 71c and extends downward. The inertial collector 72 is located below (e.g., directly below) the first flow path 71a and communicates with the opening 71f of the bend 71c. That is, the inertial collector 72 is positioned directly below the drain outlet 14d of the condenser 14. The inertial collector 72 captures foreign matter separated from the condensate flowing through the temporary bend piping 71 by inertial force.

[0099] Figure 12 This is an enlarged cross-sectional view showing a portion of the temporary piping 70. The inertia collector 72, for example, has a cylindrical portion 72a, a drain outlet 72b, a blocking component 72c, a connecting portion 72d, and a bottom cover 72e.

[0100] The cylindrical portion 72a is located below (e.g., directly below) the first flow path portion 71a and communicates with the opening 71f of the bend 71c of the temporary bend pipe 71. That is, the cylindrical portion 72a is located directly below the drain outlet 14d of the condenser 14. The cylindrical portion 72a extends downward (e.g., vertically downward). The cylindrical portion 72a has a sidewall 72s formed in a cylindrical shape.

[0101] A drain outlet 72b is located near the lower end of the cylindrical portion 72a. The drain outlet 72b is an opening in the side wall 72s on a portion of the circumferential direction of the cylindrical portion 72a. The drain outlet 72b connects the inside and outside of the cylindrical portion 72a. A blocking member 72c is detachably installed on the drain outlet 72b. When the blocking member 72c is installed, the drain outlet 72b is blocked. Alternatively, by removing the blocking member 72c, operators can discharge condensate and foreign matter accumulated in the inertial collector 72 to the outside through the drain outlet 72b.

[0102] A connecting portion 72d is provided at the lower end of the cylindrical portion 72a. The connecting portion 72d is a connecting portion capable of mounting a bottom cover 72e. The connecting portion 72d is, for example, a connecting seat that serves as a connecting flange. The bottom cover 72e is mounted on the connecting portion 72d and blocks the lower part of the cylindrical portion 72a.

[0103] (Flowchart of the capture method)

[0104] Next, the process of the foreign object capture method according to the second embodiment will be described.

[0105] Figure 13 This is a flowchart illustrating the process of the trapping method according to the second embodiment of the present invention. In addition to the steps of the trapping method of the first embodiment, the trapping method of this embodiment also includes a temporary piping installation step (S21), a temporary piping removal step (S22), and a permanent piping installation step (S23).

[0106] The temporary piping setup process (S21) is performed before the trial operation start process (S12). In the temporary piping setup process (S21), a temporary piping 70 containing the inertia collector 72 is installed between the first connecting piping 61 and the second connecting piping 62. After that, the trial operation start process (S12) is performed. That is, the furnace is shut down with the temporary piping 70 containing the inertia collector 72 installed.

[0107] The temporary piping removal process (S22) and the permanent piping installation process (S23) are performed after the trial operation start process (S12) (i.e., after shutdown) and before the operational start process (S14). In the temporary piping removal process (S22), the temporary piping 70 is removed between the first connecting pipe 61 and the second connecting pipe 62. Then, as part of the permanent piping installation process (S23), the permanent bend piping 63 between the first connecting pipe 61 and the second connecting pipe 62 is installed. Afterwards, the operational start process (S14) is performed.

[0108] (Effects)

[0109] In this embodiment, during boiler shutdown, a temporary piping 70 including an inertial collector 72 is installed as part of the condensate piping 60A. In this case, at least a portion of the foreign matter contained in the condensate flowing into the condensate piping 60A from the drain outlet 14d of the condenser 14 is subjected to inertial force during the flow through the first connecting piping 61 and the first flow path 71a of the temporary bend piping 71. When the flow direction of the condensate changes at the bend 71c of the temporary bend piping 71, it is separated from the condensate due to the downward inertial force and collected into the interior of the inertial collector 72. A portion of the foreign matter M stored at the bottom of the inertial collector 72 is discharged to the outside through the drain outlet 72b via the sealing member 72c. Furthermore, a portion of the foreign matter M stored at the bottom of the inertial collector 72 is discharged to the outside through the bottom cover 72e from the cylinder 72a.

[0110] According to this structure, a portion of the foreign matter that causes clogging of the condensate pump suction filter 51 is captured by the inertial collector 72, thereby preventing foreign matter from reaching the condensate pump suction filter 51. This prevents clogging of the condensate pump suction filter 51. As a result, the cleaning burden on the condensate pump suction filter 51 can be reduced.

[0111] Furthermore, from another perspective, by using a temporary piping 70 containing an inertial collector 72, clogging of the condensate pump suction filter 51 can be avoided, and foreign matter contained in the condensate within the condenser 14 can be captured. Therefore, as a shutdown method, for example, blowing air into the condenser 14 can be employed from the initial stage of shutdown. According to this shutdown method, for example, compared to shutting down the boiler by installing a temporary piping containing an inertial collector in the main steam line 21 or the steam bypass line 41, the number of shutdown procedures can be reduced. As a result, the construction or maintenance period of the steam turbine assembly 1A can be shortened.

[0112] (Other implementation methods)

[0113] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the specific structure is not limited to these embodiments, and design changes that do not depart from the spirit of the present invention are also included.

[0114] Furthermore, in the above embodiment, the condenser trap 50c includes an internal condenser filter 52 and a protective tube 53, but is not limited thereto. The condenser trap 50c may, for example, be composed only of either the internal condenser filter 52 or the protective tube 53. When the condenser trap 50c is composed only of the protective tube 53, the size of the opening 53h of the protective tube 53 becomes the "second size".

[0115] [Postscript]

[0116] The collection device 50, condensation equipment CE, CEA, and collection method described in each embodiment can be understood as follows.

[0117] (1) The trapping device 50 involved in the first method is a device for trapping foreign matter mixed into the condensate of the condenser 14 of the steam turbine assembly 1, 1A. It includes a first foreign matter trap (e.g., condensate pump suction filter 51) and a trap inside the condenser 50c. The first foreign matter trap is located upstream of the condensate pump 26 on the drain outlet 14d connected to the condensate pipes 60, 60A of the condensate pump 26 at the bottom 14b of the condenser 14, and has an opening 51h of a first size, allowing condensate to pass through and trapping foreign matter. The trap inside the condenser 50c is located inside the condenser 14 and has an opening 52h (or opening 53h) of a second size larger than the first size, allowing condensate inside the condenser 14 to pass through the drain outlet 14d and trapping foreign matter.

[0118] According to this structure, the condensate in the condenser 14 is smoothly guided to the drain outlet 14d, and at least a portion of the foreign matter that causes blockage of the first foreign matter trap is captured within the condenser 14, thereby preventing foreign matter from reaching the first foreign matter trap. Thus, blockage of the first foreign matter trap can be prevented. As a result, the cleaning burden on the first foreign matter trap can be reduced.

[0119] Furthermore, from another perspective, clogging of the first foreign matter collector can be avoided, and foreign matter contained in the condensate within the condenser 14 can be collected. Therefore, as a shutdown method, for example, blowing air into the condenser 14 can be employed from the initial stage of shutdown. According to this shutdown method, for example, compared to shutting down the boiler by installing temporary piping containing an inertial collector in the main steam line 21 or steam bypass line 41, the number of shutdown procedures can be reduced. As a result, the construction or maintenance period of the steam turbine assembly 1, 1A can be shortened.

[0120] (2) The trapping device 50 involved in the second method is the trapping device 50 of (1), wherein the trapping device 50c inside the condenser may include: a second foreign object trapping device (e.g., a filter 52 inside the condenser), configured to cover the drain outlet 14d and having an opening 52h of a second size, and allowing condensate water to pass through to trap foreign objects; and a third foreign object trapping device (e.g., a protective tube 53), disposed at the bottom 14b of the condenser 14, surrounding the second foreign object trapping device, and having an opening 53h of a third size larger than the second size, and allowing condensate water to pass through to trap foreign objects.

[0121] According to this structure, foreign objects of different sizes are captured by the third, second, and first foreign object collectors in order of size. Therefore, clogging of the second and first foreign object collectors is less likely. This further reduces the cleaning workload.

[0122] (3) The trapping device 50 involved in the third method is the trapping device 50 of (2), wherein the height H2 of the third foreign object trap relative to the bottom 14b of the condenser 14 can be higher than the height H1 of the second foreign object trap relative to the bottom 14b of the condenser 14.

[0123] This structure further reduces the likelihood that foreign matter settling at the bottom 14b of the condenser 14 will bypass the third foreign matter collector and reach the second foreign matter collector. Therefore, blockage of both the second and first foreign matter collectors is less likely. This further reduces the cleaning workload.

[0124] (4) The trapping device 50 involved in the fourth method is the trapping device 50 of (2) or (3), wherein the third foreign object trap is a cylindrical shape having a sidewall 53s surrounding the second foreign object trap. The third-sized opening 53h provided in the third foreign object trap can be provided in the sidewall 53s and reach the bottom 14b of the condenser 14.

[0125] This structure allows all condensate present on the outer periphery of the third foreign object collector to be drained. This avoids false detections by the water level sensor located on the condenser 14 and improves the operability of maintenance and other operations related to the condenser 14.

[0126] (5) The trapping device 50 involved in the fifth method is the trapping device 50 of (4), wherein the opening 53h of the third size provided in the third foreign object trap can be a crack extending from the upper end to the lower end of the side wall 53s.

[0127] Based on this structure, the third foreign object trap can be manufactured relatively easily.

[0128] (6) The condensing equipment CE and CEA involved in the sixth method are equipped with a condenser 14 and a collection device 50 as described in any one of (1) to (5).

[0129] Based on this structure, condensation devices CE and CEA can be provided that can reduce the cleaning burden on the first foreign matter trap.

[0130] (7) The condensing equipment CEA involved in the seventh method may have a connection part 61a (or connection part 62a) provided on the condensate piping 60A, and may selectively install a temporary piping 70 including an inertial collector 72 and a permanent piping as a bend piping 63 as part of the condensate piping 60A.

[0131] This structure improves the operability of installing temporary piping 70, including the inertial collector 72, as part of condensate piping 60A. Consequently, it shortens the construction or maintenance period for steam turbine assemblies 1 and 1A.

[0132] (8) The condensing equipment CEA involved in the eighth method is the condensing equipment CEA of (7), wherein the temporary piping 70 may have: a first flow path 71a, through which condensate discharged from the drain outlet 14d flows downward; a second flow path 71b, extending in a direction intersecting with the first flow path 71a; and a bend 71c, disposed between the first flow path 71a and the second flow path 71b, wherein the inertial collector 72 may branch from the bend 71c and extend downward.

[0133] According to this structure, a portion of the foreign object that causes blockage of the first foreign object collector is captured by the inertial collector 72, thereby preventing foreign objects from reaching the first foreign object collector. This prevents blockage of the first foreign object collector. As a result, the cleaning burden on the first foreign object collector can be reduced.

[0134] (9) The condensing device CEA involved in the ninth method is the condensing device CEA of (7) or (8), wherein the inertial collector 72 may be arranged directly below the drain outlet 14d.

[0135] This structure makes it easy to apply an inertial force toward the inertial collector 72 to foreign objects. As a result, the recovery efficiency of foreign objects based on the inertial collector 72 can be improved.

[0136] (10) The capture method involved in the 10th method is a capture method for capturing foreign objects mixed into the condensate water of the condenser 14 of the steam turbine assembly 1, 1A. In this method, a first foreign object capture device (e.g., condensate pump suction filter 51) is installed at a position upstream of the condensate pump 26 on the drain outlet 14d connected to the condensate water pipes 60, 60A of the condensate pump 26 at the bottom 14b of the condenser. The first foreign object capture device has an opening 51h of a first size and allows condensate water to pass through to capture foreign objects. A condenser internal capture device 50c is installed inside the condenser 14. The condenser internal capture device 50c has an opening 52h (or opening 53h) of a second size larger than the first size and allows condensate water inside the condenser 14 to pass towards the drain outlet 14d to capture foreign objects. The boiler is shut down while the first foreign object capture device and the condenser internal capture device 50c are installed.

[0137] This structure prevents clogging of the first foreign matter collector and captures foreign matter contained in the condensate within the condenser 14. Therefore, as a shutdown method, for example, blowing air into the condenser 14 can be employed from the initial stage of shutdown. This shutdown method reduces the number of steps required for shutdown compared to methods such as installing temporary piping containing an inertial collector in the main steam line 21 or steam bypass line 41. Consequently, the construction and maintenance periods for the steam turbine assembly 1 and 1A can be shortened.

[0138] (11) The collection method involved in the 11th method is the collection method of (10), wherein a temporary piping 70 containing an inertial collector 72 can be set as part of the condensate piping 60A, and the furnace can be shut down while the temporary piping 70 is set.

[0139] This structure further prevents clogging of the first foreign object collector and captures foreign objects contained in the condensate in the condenser 14.

[0140] Industrial availability

[0141] The collection device, condensation equipment, and collection method according to the present invention can reduce the cleaning burden.

[0142] Symbol Explanation

[0143] 1. 1A - Steam turbine assembly, 11 - Boiler, 12 - Steam turbine, 13 - Generator, 14 - Condenser, 14b - Bottom, 14d - Drain outlet, 21 - Main steam pipeline, 25 - Condensate pipeline, 26 - Condensate pump, 31 - Feed water pipeline, 41 - Steam bypass pipeline, 50 - Collection device, 50c - Condenser internal collector, 51 - Condensate pump suction filter, 51h - Opening, 52 - Condenser internal filter, 52h - Opening, 53 - Protective pipe, 53h - Opening, 60, 60A - Condensate piping, 61 - First connecting piping, 61a - Connection, 62 - Second connecting piping, 62a - Connection, 63 - Bend piping (permanent bend piping), 70 - Temporary piping, 71 - Bend piping (temporary bend piping), 72 - Inertial collector, CE, CEA - Condensation equipment.

Claims

1. A collection device for collecting foreign matter mixed into the condensate of a steam turbine assembly, the collection device comprising: The first foreign object collector is located upstream of the condensate pump in the piping connecting the drain outlet at the bottom of the condenser and the condensate pump, and has an opening of the first size, allowing condensate to pass through to collect foreign objects. and A trap inside the condenser is disposed inside the condenser and has a second-sized opening larger than the first size, allowing condensate water inside the condenser to pass towards the drain outlet to trap foreign objects. The trap inside the condenser includes: The second foreign object trap is configured to cover the drain outlet and has an opening of the second size, allowing condensate to pass through while trapping foreign objects. and The third foreign object collector is located at the bottom of the condenser, surrounding the second foreign object collector, and has a third-sized opening that is larger than the second size, allowing condensate to pass through and collecting foreign objects.

2. The collection device according to claim 1, wherein, The height of the third foreign object collector relative to the bottom of the condenser is higher than the height of the second foreign object collector relative to the bottom of the condenser.

3. The collection device according to claim 1 or 2, wherein, The third foreign object collector is a cylindrical shape with sidewalls surrounding the second foreign object collector. The third-sized opening of the third foreign object trap is located on the side wall and reaches the bottom of the condenser.

4. The collection device according to claim 3, wherein, The third-sized opening provided in the third foreign object trap is a crack extending from the upper end to the lower end of the sidewall.

5. A condensation device, comprising: The condenser; and The collection device according to any one of claims 1 to 4.

6. The condensing device according to claim 5, further comprising a connection portion disposed on the piping, and capable of selectively installing temporary piping including an inertial collector and permanent piping as a bend as part of the piping.

7. The condensation device according to claim 6, wherein, The temporary piping includes: a first flow path through which condensate discharged from the drain outlet flows downwards; a second flow path extending in a direction intersecting the first flow path; and a bend disposed between the first and second flow paths. The inertial collector branches off from the curved portion and extends downwards.

8. The condensation device according to claim 6 or 7, wherein, The inertial collector is positioned directly below the drain outlet.

9. A condensation device for collecting foreign matter mixed into the condensate of a steam turbine assembly, the condensation device comprising: The condenser; Collection device; and Connecting part, The trapping device includes: The first foreign object collector is located upstream of the condensate pump in the piping connecting the drain outlet at the bottom of the condenser and the condensate pump, and has an opening of a first size, allowing condensate to pass through to collect foreign objects; and A trap inside the condenser is disposed inside the condenser and has a second-sized opening larger than the first size, allowing condensate water inside the condenser to pass towards the drain outlet to trap foreign objects. The connection portion is provided on the piping, and can selectively install temporary piping containing an inertial collector and permanent piping as a bend as part of the piping. The inertial collector is positioned directly below the drain outlet.

10. A method for capturing foreign matter mixed into the condensate of a steam turbine assembly, wherein, A first foreign object trap is installed upstream of the condensate pump in the piping connecting the drain outlet at the bottom of the condenser and the condensate pump. The first foreign object trap has an opening of a first size and allows condensate to pass through while trapping foreign objects. A condenser trap is installed inside the condenser. The condenser trap has a second opening, larger than the first size, and allows the condensate inside the condenser to pass towards the drain outlet to trap foreign objects. The trap inside the condenser includes: A second foreign object collector is configured to cover the drain outlet and has an opening of the second size, allowing condensate to pass through while collecting foreign objects; and A third foreign object collector is disposed at the bottom of the condenser, surrounding the second foreign object collector, and has an opening of a third size larger than the second foreign object collector, allowing condensate to pass through while capturing foreign objects. The furnace is shut down while the first foreign object collector and the collector inside the condenser are in place.

11. The capture method according to claim 10, wherein, A temporary piping containing an inertial collector is provided as part of the piping. The shutdown is performed with the temporary piping in place.

12. A method for capturing foreign matter mixed into the condensate of a steam turbine assembly, wherein, A first foreign object trap is installed upstream of the condensate pump in the piping connecting the drain outlet at the bottom of the condenser and the condensate pump. The first foreign object trap has an opening of a first size and allows condensate to pass through while trapping foreign objects. A condenser trap is installed inside the condenser. The condenser trap has a second opening, larger than the first size, and allows the condensate inside the condenser to pass towards the drain outlet to trap foreign objects. A temporary piping containing an inertial collector is provided as part of the piping. The inertial collector is positioned directly below the drain outlet. The furnace is shut down with the first foreign object trap, the condenser trap, and the temporary piping installed.

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