Steam turbine equipment and cleaning method thereof

Abstract

The steam turbine equipment includes: a boiler; a steam turbine; a condenser; a condensate pump; a main steam line that guides steam generated in the boiler to the steam turbine; a bypass line that branches from the main steam line and connects to the condenser; a condensate line that guides water in the condenser to the condensate pump; a condensate outlet valve provided in the condensate line; a water supply line that guides water pressurized in the condensate pump to the boiler; a first connection portion that branches from a position in the condensate line closer to the condenser than the condensate outlet valve; and a second connection portion that branches from a position in the condensate line closer to the condensate pump than the condensate outlet valve. The first connection portion includes a first connection socket that can be connected to the first line. The second connection portion includes a second connection socket that can be connected to the second line.

Description

Technical Field

[0001] The present invention relates to a steam turbine device including a boiler and a steam turbine and a cleaning method thereof.

[0002] This application claims priority based on Japanese Patent Application No. 2020-157199, filed on September 18, 2020, the contents of which are incorporated herein by reference. Background Art

[0003] Generally speaking, steam turbine equipment includes: a boiler; a steam turbine driven by steam from the boiler; a condenser that converts steam discharged from the steam turbine into water; various pumps such as a condensate pump or a water supply pump; a main steam pipeline that guides the steam generated in the boiler to the steam turbine; a steam stop valve installed in the main steam pipeline; a water pipeline that guides the water in the condenser to the boiler via a condensate pump or a water supply pump; a bypass pipeline that branches off from the main steam pipeline at a position closer to the boiler than the steam stop valve and is connected to the condenser; and a bypass valve installed in the bypass pipeline.

[0004] After construction or maintenance of a steam turbine facility, foreign matter such as welding slag and grinding debris remains in piping and various equipment. Therefore, in such steam turbine facilities, purging (or flushing) is performed to remove the foreign matter after construction or maintenance.

[0005] A method for cleaning steam turbine equipment is disclosed in, for example, Patent Document 1 below.

[0006] In the cleaning method disclosed in Patent Document 1, temporary piping is installed before purging. One end of this temporary piping is connected to a bypass valve, and the other end is connected to an exhaust pipe via various pipelines. Steam is then generated in the boiler and discharged into the atmosphere from the exhaust pipe via the main steam line, bypass line, bypass valve, temporary piping, and various other pipelines. In other words, during this purging process, the steam generated in the boiler is not allowed to flow into the steam turbine, but is instead discharged into the atmosphere via temporary piping, thereby discharging any foreign matter remaining in the piping along with the steam.

[0007] Previous technical literature

[0008] Patent Literature

[0009] Patent Document 1: Japanese Patent Application Laid-Open No. 2016-089656 Summary of the Invention

[0010] Technical issues to be solved by the invention

[0011] The technology described in Patent Document 1 has the following problems: since foreign matter remaining in the pipe is discharged into the atmosphere together with steam, not only the surrounding area of ​​the equipment is polluted, but also noise is generated when steam is discharged into the atmosphere.

[0012] Therefore, an object of the present invention is to provide a steam turbine plant and a cleaning method thereof that can suppress contamination and noise around the plant.

[0013] Means for solving technical problems

[0014] A steam turbine plant as one embodiment for achieving the above-mentioned object includes:

[0015] a boiler capable of generating steam; a steam turbine capable of being driven by the steam from the boiler; a condenser capable of restoring the steam discharged from the steam turbine to water; a condensation pump capable of pressurizing the water from the condenser; a main steam pipeline for guiding the steam generated in the boiler to the steam turbine; a steam stop valve provided in the main steam pipeline and capable of preventing the flow of steam into the steam turbine; a bypass pipeline for branching off from a position on the side of the main steam pipeline closer to the boiler than the steam stop valve and connected to the condenser; a bypass valve provided in the bypass pipeline; a condensate pipeline for guiding the water in the condenser to the condensate pump; a condensate outlet valve provided in the condensate pipeline; a water supply pipeline for guiding the water pressurized in the condensate pump to the boiler; and a pure water supply device. The pure water supply device includes a pure water tank capable of storing pure water; a pure water pipeline for guiding the pure water in the pure water tank to the condenser; a pure water pump disposed in the pure water pipeline; and a pure water regulating valve disposed in the pure water pipeline closer to the condenser than the pure water pump. The steam turbine equipment further includes a first connection portion branching off from a position in the condensed water pipeline closer to the condenser than the condensed water outlet valve; a second connection portion branching off from a position in the condensed water pipeline closer to the condensed water pump than the condensed water outlet valve; and a third connection portion branching off from a position in the pure water pipeline closer to the condenser than the pure water pump and closer to the pure water tank than the pure water regulating valve. The first connection portion includes a first connection socket capable of being connected to the first pipeline. The second connection portion includes a second connection socket capable of being connected to the second pipeline. The third connection portion includes a third connection socket capable of being connected to the second pipeline.

[0016] In this steam turbine system, during purging, the condensate pump is driven with the steam shutoff valve, bypass valve, and condensate outlet valve closed, and pure water is supplied to the condensate pump from the second connection. This pure water then flows into the boiler via the water supply line. Steam entering the boiler then flows into the condenser via a portion of the main steam line and the bypass line. This steam is converted back into water within the condenser and retained within the condenser. The water retained in the condenser is then discharged from the condensate line and the first connection and recovered in a container such as a tank. In this manner, this steam turbine system can convert steam containing foreign matter into water and then recover it in a container, thereby reducing contamination and noise around the equipment.

[0017] Furthermore, in the steam turbine equipment of this embodiment, by connecting the second connection socket and the third connection socket via a second pipe, pure water in the pure water tank can be supplied to the condensate pump. Furthermore, in the steam turbine equipment of this embodiment, the first connection portion, the second connection portion, and the third connection portion each have a connection socket, making it easy to connect the pipes to these connection portions.

[0018] A method for cleaning a steam turbine plant as one embodiment for achieving the above-described object is applied to the following steam turbine plant.

[0019] The steam turbine equipment includes: a boiler capable of generating steam; a steam turbine capable of being driven by the steam from the boiler; a condenser capable of restoring the steam discharged from the steam turbine to water; a condensate pump capable of pressurizing the water from the condenser; a main steam line for guiding the steam generated in the boiler to the steam turbine; a steam stop valve provided in the main steam line and capable of preventing the steam from flowing into the steam turbine; a bypass line branching off from a position on the side of the main steam line closer to the boiler than the steam stop valve and connected to the condenser; a bypass valve provided in the bypass line; a condensate line for guiding the water in the condenser to the condensate pump; a condensate outlet valve provided in the condensate line; a water supply line for guiding the water pressurized in the condensate pump to the boiler; and a pure water supply device having a pure water tank capable of storing pure water and capable of supplying the pure water in the pure water tank to the condenser.

[0020] In this cleaning method, a preparation step and a purge step are performed. The preparation step includes: a water blow-off recovery device installation step, in which a water blow-off recovery device is connected to the condensed water pipeline at a position closer to the condenser than the condensed water outlet valve, the water blow-off recovery device including a water blow-off tank capable of temporarily storing water from the condenser; and a temporary pure water pipeline connection step, in which a temporary pure water pipeline is connected to the condensed water pipeline at a position closer to the condensate pump than the condensed water outlet valve to discharge water in the pure water tank. The purging process includes: a purging pipeline setting process, closing the steam stop valve and the condensate outlet valve, and opening the bypass valve; a pure water supply process, supplying the pure water in the pure water tank to the boiler via the temporary pure water pipeline, the condensate pump and the water supply pipeline; a steam supply process, heating the pure water supplied to the boiler in the pure water supply process in the boiler to generate steam, guiding the steam generated in the boiler to the condenser via the main steam pipeline and the bypass pipeline, and restoring the steam guided to the condenser to water in the condenser; and a blowing water recovery process, sending the water retained in the condenser in the steam supply process to the blowing water tank.

[0021] In this method, during the pure water supply step within the purge process, pure water from the pure water tank is supplied to the boiler via a temporary pure water line, a condensate pump, and a water supply line. During the steam supply step within the purge process, pure water is heated in the boiler to generate steam, which is then directed to the condenser via a main steam line and a bypass line. The steam directed to the condenser is then converted back into water within the condenser. During the water recovery step within the purge process, water remaining in the condenser is sent to the water recovery tank. This method, by converting steam containing foreign matter into water and then recovering it in the water recovery tank, can reduce contamination and noise around the equipment.

[0022] Effects of the Invention

[0023] In one aspect of the present invention, during the execution of the purge, steam containing foreign matter can be converted into water and then recovered in a container or the like, thereby suppressing contamination and noise around the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a system diagram of a permanent portion of a steam turbine plant in one embodiment of the present invention.

[0025] Figure 2 It is an explanatory diagram showing the structure of an inertial filter in one embodiment according to the present invention.

[0026] Figure 3 This is a system diagram of permanent and temporary parts of a steam turbine facility in one embodiment of the present invention.

[0027] Figure 4 This is a flowchart showing the procedure of a cleaning method according to one embodiment of the present invention. DETAILED DESCRIPTION

[0028] Hereinafter, embodiments of the steam turbine equipment and the cleaning method thereof according to the present invention will be described.

[0029] Steam turbine equipment

[0030] refer to Figures 1 to 3 The steam turbine plant of this embodiment will be described. The steam turbine plant of this embodiment includes a permanent section and a temporary section.

[0031] like Figure 1 As shown, the permanent part A of the steam turbine equipment includes a boiler 10, a steam turbine 11, a condenser 13, a pure water supply device 15, a wastewater treatment device 20, a condensate pump 21, a water supply pump 22, a main steam pipeline 23, a steam stop valve 24, a steam regulating valve 25, a bypass pipeline 26, a bypass valve 28, an inertial filter 29, a bypass steam blowing pipeline 30, a bypass steam blowing valve 31, a condensate pipeline 32, a condensate outlet valve 33, a water supply pipeline 34, a water supply regulating valve 35, a water quality detector 36, a water supply blowing pipeline 37 and a water supply blowing valve 38.

[0032] The boiler 10 heats water to generate steam. The steam turbine 11 includes a turbine rotor 11r and a turbine casing 11c that covers the turbine rotor 11r. Steam from the boiler 10 flows into the turbine casing 11c. The turbine rotor 11r is rotated by the steam flowing into the turbine casing 11c. For example, the rotor of the generator 12 is connected to the turbine rotor 11r.

[0033] The condenser 13 includes a condenser shell 13c and a heat transfer tube group 13t disposed within the condenser shell 13c and composed of a plurality of heat transfer tubes. The condenser shell 13c has a steam inlet opening 13ci that guides steam exhausted from the steam turbine 11 into the condenser shell 13c. A cooling medium CM for cooling the steam exhausted from the steam turbine 11 flows through the plurality of heat transfer tubes. The cooling medium CM is, for example, seawater or river water. The steam exhausted from the steam turbine 11 is cooled by the cooling medium CM flowing through the heat transfer tubes and becomes water. This water may be hereinafter referred to as condensed water. A hot well 13ch is formed within the condenser shell 13c below the heat transfer tube group 13t. Condensed water accumulates in the hot well 13ch.

[0034] The pure water supply device 15 includes a pure water tank 16 capable of storing pure water; a pure water pipe 17 for guiding the pure water in the pure water tank 16 into the condenser housing 13c; a pure water pump 18 provided in the pure water pipe 17; and a pure water regulating valve 19 disposed in the pure water pipe 17 on the side of the condenser 13 closer to the pure water pump 18. When the amount of condensed water in the condenser housing 13c decreases, the pure water regulating valve 19 opens, and the pure water in the pure water tank 16 is replenished into the condenser housing 13c as condensed water.

[0035] The main steam line 23 connects the steam outlet of the boiler 10 and the steam inlet of the turbine casing 11c. A steam stop valve 24 that blocks the flow of steam into the steam turbine 11 and a steam regulating valve 25 that regulates the flow of steam into the steam turbine 11 are provided in the main steam line 23.

[0036] The bypass line 26 branches off from the main steam line 23 at a position closer to the boiler 10 than the steam stop valve 24. The bypass line 26 is connected to the condenser shell 13c. The bypass line 26 is provided with a bypass valve 28 and an inertial filter 29.

[0037] like Figure 2 As shown, the bypass line 26 includes an upstream straight pipe portion 26u, a bent portion 26c, and a downstream straight pipe portion 26d. The portion of the bypass line 26 extending from the bent portion 26c toward the boiler 10 for a predetermined distance constitutes the upstream straight pipe portion 26u. Furthermore, the portion of the bypass line 26 extending from the bent portion 26c toward the condenser 13 for a predetermined distance constitutes the downstream straight pipe portion 26d. The downstream straight pipe portion 26d forms a predetermined angle (e.g., 90°) with respect to the upstream straight pipe portion 26u. The inertial filter 29 includes a straight pipe 29p connected to the side opposite the upstream straight pipe portion 26u relative to the bent portion 26c, and a blind flange 29bf closing the end of the straight pipe 29p. The straight pipe 29p of the inertial filter 29 extends in the same direction as the upstream straight pipe portion 26u of the bypass line 26. Therefore, the straight pipe 29p of the inertial filter 29 and the upstream straight pipe section 26u of the bypass line 26 are located on the same straight line. The bypass valve 28 is connected to the front end of the downstream straight pipe section 26d of the bypass line 26. Due to its inertia, large foreign matter F in the steam flowing through the bypass line 26 travels straightly from the upstream straight pipe section 26u, passes through the bend 26c, and flows into the inertial filter 29. As a result, the large foreign matter F in the steam is captured by the inertial filter 29. Therefore, the amount of foreign matter F in the steam flowing through the bend 26c and into the downstream straight pipe section 26d is reduced, and the amount of foreign matter F contained in the steam passing through the bypass valve 28 and the steam flowing into the condenser 13 can be reduced.

[0038] A bypass steam blowing pipe 30 is connected to the straight pipe 29p of the inertial filter 29. This bypass steam blowing pipe 30 is also connected to the condenser case 13c in the same manner as the bypass pipe 26. A bypass steam blowing valve 31 is provided in this bypass steam blowing pipe 30.

[0039] A target insertion portion 27 is provided in the bypass line 26 closer to the condenser 13 than the bypass valve 28. The target insertion portion 27 is a portion that allows a target 62 that blocks a portion of the bypass line 26 to be inserted into the bypass line 26. The target 62 is, for example, an iron plate.

[0040] like Figure 1 As shown, the connection position between the bypass line 26 and the condenser shell 13c and the connection position between the bypass steam blowing line 30 and the condenser shell 13c are both located closer to the steam turbine 11 than the position where the heat transfer tube group 13t is arranged in the condenser shell 13c.

[0041] The condensed water pipe 32 connects the hot well 13ch of the condenser housing 13c and the suction port of the condensate pump 21. The condensed water pipe 32 is provided with a condensed water outlet valve 33.

[0042] The water supply line 34 connects the discharge port of the condensate pump 21 with the water inlet of the boiler 10. The water supply line 34 is provided with a water supply pump 22, which raises the pressure of water from the condensate pump 21 and delivers it to the boiler 10. A water supply regulating valve 35 is provided in the water supply line 34, closer to the boiler 10 than the water supply pump 22. It regulates the flow rate of water delivered to the boiler 10. Furthermore, a water quality detector 36 is connected to the water supply line 34, closer to the condensate pump 21 than the water supply pump 22. This water quality detector 36 detects the contamination level of the water flowing through the water supply line 34. A water supply purge line 37 is connected to the water supply line 34, closer to the condensate pump 21 than the water quality detector 36. The wastewater treatment device 20 is connected to the front end of the water supply purge line 37. The wastewater treatment device 20 purifies the water flowing through the water supply line 34. The water supply blow-out pipe 37 is connected to the wastewater treatment device 20 so as to communicate with the treated water receiving space in the wastewater treatment device 20 that receives the water to be purified. A water supply blow-out valve 38 is provided in the water supply blow-out pipe 37. This water supply blow-out valve 38 is opened when the contamination level detected by the water quality detector 36 exceeds a preset contamination level.

[0043] The permanent portion A of the steam turbine equipment further includes a first connection portion 41, a second connection portion 42, a third connection portion 43, and a fourth connection portion 44. The first connection portion 41 includes a first connection seat 41s that can be connected to the first pipeline, and a first branch pipe 41p that branches off from a position in the condensate pipeline 32 that is closer to the condenser 13 than the condensate outlet valve 33. The first connection seat 41s is a connection flange and is provided at the end of the first branch pipe 41p. The second connection portion 42 includes a second connection seat 42s that can be connected to the second pipeline, and a second branch pipe 42p that branches off from a position in the condensate pipeline 32 that is closer to the condensate pump 21 than the condensate outlet valve 33. The second connection seat 42s is a connection flange and is provided at the end of the second branch pipe 42p. The third connection portion 43 includes: a third connection seat 43s, which can be connected to the second pipeline; and a third branch pipe 43p, which branches off from a position in the pure water pipeline 17 that is closer to the condenser 13 than the pure water pump 18 and closer to the pure water tank 16 than the pure water regulating valve 19. The third connection seat 43s is a connection flange and is provided at the end of the third branch pipe 43p. The fourth connection portion 44 includes: a fourth connection seat 44s, which can be connected to the third pipeline; and a connecting pipe 44p, which is connected to the treated water receiving space of the wastewater treatment device 20. The fourth connection seat 44s is a connection flange and is provided at the end of the connecting pipe 44p. Blind flanges 41bf, 42bf, 43bf, and 44bf are connected to each of the connection seats 41s, 42s, 43s, and 44s.

[0044] The steam turbine plant can operate the steam turbine 11 from the start of the steam turbine 11 only by the permanent portion A described above.

[0045] When the steam turbine 11 starts up, the condensate outlet valve 33, the feedwater regulating valve 35, and the bypass valve 28 are opened, and the bypass steam blow-off valve 31 and the feedwater blow-off valve 38 are closed. During the steam turbine 11 startup, under these conditions, the condensate pump 21 and the feedwater pump 22 are driven, supplying water from the condenser 13 to the boiler 10. In the boiler 10, this water is heated to steam. The steam generated in the boiler 10 flows into the condenser 13 via the main steam line 23, the bypass line 26, and the bypass valve 28. Within the condenser 13, this steam is cooled and converted back into water.

[0046] When the steam from the boiler 10 satisfies the steam conditions, the bypass valve 28 is closed, while the steam stop valve 24 and the steam regulating valve 25 are opened, and steam from the boiler 10 is supplied to the steam turbine 11. The steam conditions refer to the conditions under which steam can be supplied to the steam turbine 11. Specifically, the steam conditions include, for example, that the steam temperature is above a predetermined temperature and that the steam generation amount is above a predetermined amount.

[0047] When steam is supplied to the steam turbine 11, the turbine rotor 11r is rotated by this steam. The steam that rotates the turbine rotor 11r is discharged from the steam turbine 11 and flows into the condenser 13. The steam flowing into the condenser 13 is cooled by the coolant CM flowing through the multiple heat transfer tubes within the condenser housing 13c, and is converted back into water. This water is supplied to the boiler 10 via the condensed water pipe 32 and the water supply pipe 34.

[0048] The opening degree of the steam regulating valve 25 is controlled based on, for example, an external request output signal.

[0049] If the contamination level detected by the water quality detector 36 exceeds a predetermined level, the water supply blow-off valve 38 is opened. As a result, part of the water flowing through the water supply pipe 34 flows into the wastewater treatment device 20. The wastewater treatment device 20 purifies the water and then discharges it to the outside.

[0050] When the amount of condensed water accumulated in the hot well 13ch of the condenser case 13c decreases, the pure water regulating valve 19 is opened and the pure water pump 18 is driven. As a result, the water in the pure water tank 16 is replenished into the condenser case 13c as condensed water.

[0051] like Figure 3 As shown, the temporary section B of the steam turbine equipment includes a temporary pure water pipeline 50 , a temporary pure water regulating valve 51 , a blow-off water recovery device 52 , a turbine protection plate 60 , a heat transfer tube protection net 61 , and a target 62 .

[0052] The temporary pure water line 50, serving as the aforementioned second line, is connectable to the second connection socket 42s and the third connection socket 43s. The temporary pure water line 50 includes a connecting flange that can be connected to the second connection socket 42s and a connecting flange that can be connected to the third connection socket 43s. A temporary pure water regulating valve 51 is disposed within the temporary pure water line 50.

[0053] The blow-off water recovery device 52 includes a blow-off water tank 53, a blow-off water pipe 54, a blow-off water pump 55, a blow-off water valve 56, a sampling nozzle 57, a blow-off water discharge pipe 58, and a blow-off water discharge pump 59. The blow-off water tank 53 is a tank that can temporarily store water from the condenser 13. The blow-off water pipe 54 connects the first connection socket 41s to the blow-off water tank 53 and guides the water from the condenser 13 to the blow-off water tank 53. The blow-off water pipe 54 has a connecting flange that can be connected to the first connection socket 41s, which serves as a connecting flange. This blow-off water pipe 54 is the aforementioned first pipe. The blow-off water pipe 54 is provided with a blow-off water valve 56, a blow-off water pump 55, and a sampling nozzle 57. The blow-off water pump 55 is located closer to the blow-off water tank 53 than the blow-off water valve 56. The sampling nozzle 57 is located closer to the blow-off water tank 53 than the blow-off water pump 55. The blow water discharge line 58 connects the blow water tank 53 to the fourth connection socket 44s and directs the water in the blow water tank 53 to the wastewater treatment device 20. The blow water discharge line 58 includes a connecting flange that can be connected to the fourth connection socket 44s, which serves as a connecting flange. A blow water discharge pump 59 is provided in the blow water discharge line 58.

[0054] The turbine protection plate 60 is a partition plate arranged in the condenser shell 13c, which is closer to the steam turbine 11 side than the connection position between the condenser shell 13c and the bypass pipe 26 and the connection position between the condenser shell 13c and the bypass steam blowing pipe 30, and divides the space in the condenser shell 13c into the heat transfer tube group 13t side and the steam turbine 11 side.

[0055] The heat transfer tube protection net 61 is a net capable of covering at least the side of the heat transfer tube group 13t where steam from the bypass line 26 flows in. In other words, the heat transfer tube protection net 61 is a net capable of covering at least the steam turbine 11 side of the heat transfer tube group 13t. The heat transfer tube protection net 61 is, for example, a wire mesh. For example, the heat transfer tube protection net 61 has 40 meshes per inch (25.4 mm).

[0056] "Cleaning Methods for Steam Turbine Equipment"

[0057] according to Figure 4 The cleaning method of the steam turbine equipment according to the present embodiment will be described with reference to the flowchart shown in FIG.

[0058] After the construction or maintenance of the permanent section A of a steam turbine plant, foreign matter such as welding slag and grinding chips remains in the pipes and various devices. In this embodiment, the cleaning method described below is performed to remove the foreign matter.

[0059] In the cleaning method of this embodiment, first, a preparation step (S10) is performed. The preparation step (S10) includes a blow-off water recovery device installation step (S11), a temporary pure water pipeline connection step (S12), a protection plate installation step (S13), and a protection net installation step (S14).

[0060] In the blown water recovery device installation step ( S11 ), the blown water recovery device 52, which is part of the temporary unit B, is connected to the permanent unit A. At this time, the blown water pipe 54 of the blown water recovery device 52 is flange-connected to the first connection socket 41s connected to the condensed water pipe 32. Furthermore, the blown water discharge pipe 58 of the blown water recovery device 52 is flange-connected to the fourth connection socket 44s connected to the wastewater treatment device 20.

[0061] In the temporary pure water pipeline connection step ( S12 ), the temporary pure water pipeline 50 provided with a temporary pure water regulating valve 51 is connected to the permanent portion A. At this time, the temporary pure water pipeline 50 is flange-connected to the second connection socket 42 s connected to the condensed water pipeline 32 , and the temporary pure water pipeline 50 is flange-connected to the third connection socket 43 s connected to the pure water pipeline 17 of the pure water supply device 15 .

[0062] In the protective plate installation step (S13), a turbine protective plate 60 is installed within the condenser casing 13c, closer to the steam turbine 11 than the connection points between the condenser casing 13c and the bypass pipe 26, and the connection points between the condenser casing 13c and the bypass steam blowing pipe 30. As a result, the turbine protective plate 60 partitions the space within the condenser casing 13c into the heat transfer tube group 13t side and the steam turbine 11 side. In the protective net installation step (S14), the heat transfer tube protective net 61 is used to cover the side of the heat transfer tube group 13t of the condenser 13 where steam from the bypass pipe 26 flows in.

[0063] The above concludes the preparation step (S10). As described above, the preparation step (S10) is a step of installing the temporary section B in the permanent section A. In the preparation step (S10), when a portion of the pipeline of the temporary section B is installed in the permanent section A, the pipeline flange can be connected to the permanent section A, thereby making it easy to connect the pipeline to the permanent section A. In addition, the blow-off recovery device installation step (S11), the temporary pure water pipeline connection step (S12), the protection plate installation step (S13), and the protection net installation step (S14) can be performed in any order in the preparation step (S10).

[0064] After the preparation step (S10) is completed, the purge step (S20) is executed. The purge step (S20) includes a purge line setting step (S21), a pure water supply step (S22), a steam supply step (S23), a blown water recovery step (S24), a foreign matter detection step (S25), and a foreign matter amount determination step (S26).

[0065] In the purge line setting step (S21), the steam shutoff valve 24, condensate outlet valve 33, pure water regulating valve 19, and water supply blow-off valve 38 are closed. Furthermore, in the purge step (S20), the water supply regulating valve 35, bypass valve 28, and bypass steam blow-off valve 31 are opened.

[0066] In the pure water supply step ( S22 ), the pure water pump 18 , the condensate pump 21 , and the water supply pump 22 are driven. As a result, the water in the pure water tank 16 is supplied to the boiler 10 via the temporary pure water line 50 , the condensate pump 21 , the water supply line 34 , the water supply pump 22 , and the water supply regulating valve 35 .

[0067] In the steam supply step (S23), the water supplied to the boiler 10 in the pure water supply step (S22) is heated within the boiler 10, converting the water into steam. This steam flows into the condenser shell 13c via the main steam line 23, the bypass line 26, and the bypass steam blowing line 30. The steam flowing into the condenser shell 13c is cooled by heat exchange with the cooling medium CM flowing through the multiple heat transfer tubes within the condenser shell 13c, and becomes water. This water is retained in the hot well 13ch of the condenser shell 13c.

[0068] In the blow water recovery step ( S24 ), the blow water valve 56 is opened and the blow water pump 55 is driven. As a result, the water accumulated in the hot well 13 ch of the condenser 13 is sent to the blow water tank 53 via the blow water pipe 54 and the blow water pump 55 .

[0069] By executing the above-described pure water supply step (S22), steam supply step (S23), and blow-off water recovery step (S24), foreign matter within the water supply line 34, boiler 10, a portion of the main steam line 23, bypass line 26, and condenser 13 can be recovered in the blow-off water tank 53. Thus, in this embodiment, steam containing foreign matter is converted back into water and then recovered in the blow-off water tank 53, thereby suppressing pollution and noise around the equipment.

[0070] In this embodiment, an inertial filter 29 is connected to the bypass line 26, closer to the boiler 10 than the bypass valve 28. Therefore, a portion of foreign matter flowing through the bypass line 26 along with the steam can be recovered by the inertial filter 29 before reaching the bypass valve 28. Furthermore, the foreign matter that can be recovered by the inertial filter 29 is that which has a relatively large inertial force, or in other words, a relatively large mass. Therefore, in this embodiment, clogging of the bypass valve 28 during the steam supply step (S23) can be avoided.

[0071] In this embodiment, the turbine protection plate 60 is installed within the condenser housing 13c, thereby preventing steam containing foreign matter from flowing into the turbine housing 11c. Furthermore, in this embodiment, the heat transfer tube group 13t, where steam from the bypass line 26 and the bypass steam blowing line 30 flows, is covered with a heat transfer tube protection net 61. This prevents foreign matter from adhering to the multiple heat transfer tubes comprising the heat transfer tube group 13t.

[0072] Foreign matter F settles in the water blow tank 53. As the amount of water in the water blow tank 53 increases, the water blow discharge pump 59 is activated. As a result, a portion of the water in the water blow tank 53 flows into the wastewater treatment device 20, where it undergoes purification. In this embodiment, water from the condenser 13 is delivered to the wastewater treatment device 20 via the water blow tank 53. Therefore, the entire amount of foreign matter contained in the water from the condenser 13 is not delivered to the wastewater treatment device 20. This reduces the processing load on the wastewater treatment device 20.

[0073] The foreign matter detection step (S25) and the foreign matter amount determination step (S26) are performed during the execution of the pure water supply step (S22), the steam supply step (S23), and the water blowback recovery step (S24). In the foreign matter detection step (S25), the amount of foreign matter contained in the water or steam flowing through the various pipelines in the pure water supply step (S22), the steam supply step (S23), and the water blowback recovery step (S24) is detected. Specifically, the target 62 is inserted into the target insertion portion 27 provided in the bypass pipeline 26 for a predetermined time. Thereafter, the amount of foreign matter detected within the predetermined time is detected from the foreign matter collision marks remaining on the target 62. Alternatively, water flowing through the water blowback pipeline 54 is recovered from the sampling nozzle 57 connected to the water blowback pipeline 54, and the amount of foreign matter contained in the water is detected. In the foreign matter amount determination step (S26), it is determined whether the amount of foreign matter detected in the foreign matter detection step (S25) is less than a predetermined amount S. Furthermore, the predetermined amount S for the amount of foreign matter detected using target 62 is different from the predetermined amount S for the amount of foreign matter in the sampled water. In the foreign matter amount determination step (S26), if the amount of foreign matter is determined to be less than the predetermined amount S, the pure water pump 18, condensation pump 21, and water supply pump 22 are stopped, and the purge step (S20) is terminated. On the other hand, in the foreign matter amount determination step (S26), if the amount of foreign matter is determined to be not less than the predetermined amount S, in other words, if the amount of foreign matter is greater than the predetermined amount S, the pure water supply step (S22), steam supply step (S23), and blow-off water recovery step (S24) are continued until the amount of foreign matter is less than the predetermined amount S.

[0074] In addition, the detection of the amount of foreign matter using the target 62 and the detection of the amount of foreign matter in the sampled water may be performed alone or in combination. In the case where both are performed, the purging step (S20) is terminated when the amount of foreign matter detected using the target 62 is less than the predetermined amount S and the amount of foreign matter in the sampled water is less than the predetermined amount S.

[0075] If the purging process (S20) is completed, the purging post-processing process (S31) is performed. The purging post-processing process (S31) is a process for removing the temporary part B from the permanent part A. Specifically, in the purging post-processing process (S31), the turbine protection plate 60 and the heat transfer tube protection net 61 in the condenser shell 13c are recovered from the condenser shell 13c. Moreover, the water blowing recovery device 52 and the temporary pure water pipeline 50 are removed from the permanent part A. At this time, a blind flange 41bf is connected to the first connecting seat 41s of the water blowing pipeline 54 connected to the water blowing recovery device 52, and a blind flange 44bf is connected to the fourth connecting seat 44s of the water blowing discharge pipeline 58 connected to the water blowing recovery device 52. Moreover, blind flanges 42bf and 43bf are respectively connected to the second connecting seat 42s and the third connecting seat 43s to which the temporary pure water pipeline 50 is connected.

[0076] In the post-purge process (S31) described above, the blown water recovery device 52 and the temporary pure water line 50, which are part of the temporary section B, are removed from the permanent section A. However, in the post-purge process (S31), these devices do not need to be removed from the permanent section A. In other words, the blown water recovery device 52 and the temporary pure water line 50 may be permanently installed. In this case, the blown water valve 56 and the temporary pure water regulating valve 51 are closed during the period when the purge process (S20) is not being executed.

[0077] After the purge post-processing step (S31) is completed, the circulation line setting step (S32) is executed. In this circulation line setting step (S32), the steam stop valve 24 is kept closed, and the bypass valve 28 is kept open. In addition, the condensate outlet valve 33 and the water supply regulating valve 35 are opened.

[0078] If the circulation line setting process (S32) is completed, the circulation process (S33) is executed. In the circulation process (S33), the condensate pump 21 and the water supply pump 22 are driven. As a result, the water in the condenser 13 is supplied to the boiler 10 via the condensate line 32, the condensate pump 21, the water supply line 34, and the water supply pump 22. In the boiler 10, the water is heated and becomes steam. This steam flows into the condenser shell 13c via the main steam line 23 and the bypass line 26. The steam flowing into the condenser shell 13c is cooled by heat exchange with the cooling medium CM flowing in the multiple heat transfer tubes in the condenser shell 13c and becomes water. This water is retained in the hot well 13ch of the condenser shell 13c. As described above, the water retained in the hot well 13ch is supplied to the boiler 10 via the condensate pump 21 and the water supply pump 22. That is, in this circulation process (S33), water (including water as liquid and steam as gas) circulates in the circulation pipeline composed of the condenser 13, the condensate pipeline 32, the condensate pump 21, the water supply pipeline 34, the water supply pump 22, the boiler 10, a part of the main steam pipeline 23, the bypass pipeline 26, and the bypass valve 28.

[0079] During the circulation process (S33), a water quality detection process (S34) is performed. In the water quality detection process (S34), a water quality detector 36 connected to the water supply pipe 34 detects the water quality of the water flowing through the water supply pipe 34. If the water quality detected in the water quality detection process (S34) is greater than a predetermined contamination level T, a water supply blowing process (S36) is performed. In the water supply blowing process (S36), a water supply blowing valve 38 provided in the water supply blowing pipe 37 is opened.

[0080] As a result, a portion of the water flowing through the water supply pipe 34 flows into the wastewater treatment device 20 via the water supply blowing pipe 37. The wastewater treatment device 20 purifies the water. Therefore, the amount of foreign matter contained in the water flowing through the water supply pipe 34 decreases. The circulation process (S33) is also executed in this water supply blowing process (S36). During the execution of this water supply blowing process (S36), if the amount of condensed water retained in the hot well 13ch of the condenser shell 13c decreases, the pure water regulating valve 19 is opened and the pure water pump 18 is driven. As a result, the water in the pure water tank 16 is replenished into the condenser shell 13c as condensed water.

[0081] In the circulation process (S33), if the water quality detected in the water quality detection process (S34) is lower than the preset pollution level T, the circulation process (S33) and the water supply and blowing process (S36) are terminated.

[0082] This concludes the cleaning method of this embodiment.

[0083] After the cleaning method described above is completed, the condensate pump 21 and the feed water pump 22 can be continued to operate, allowing steam from the boiler 10 to flow into the steam turbine 11 via the main steam line 23, thereby transitioning to normal operation. Furthermore, after the cleaning method is completed, the condensate pump 21 and the feed water pump 22 can be stopped, and then the condensate pump 21 and the feed water pump 22 can be restarted as described above to start the steam turbine 11.

[0084] In this embodiment, the circulation step (S33) is performed after the purge step (S20), and foreign matter is also removed in this circulation step (S33). Therefore, compared to the case where only purge is performed without the circulation step (S33), the amount of pure water used in executing the cleaning method of this embodiment can be reduced. Furthermore, in this embodiment, before starting operation of the steam turbine plant, the contamination level of the steam scheduled to be supplied to the steam turbine 11 can be reduced to a contamination level that can be supplied to the steam turbine 11. The contamination level that can be supplied to the steam turbine 11 is a contamination level that is predetermined to prevent damage to the steam turbine 11 even when steam is supplied to the steam turbine 11.

[0085] "Variation"

[0086] In the above embodiment, the protection plate setting step ( S13 ) and the protection net setting step ( S14 ) are performed. However, the protection plate setting step ( S13 ) and the protection net setting step ( S14 ) may be omitted.

[0087] The condenser 13 in the above embodiment is a water-cooled condenser, but may also be an air-cooled condenser. In the case of an air-cooled condenser, steam flows through a plurality of heat transfer tubes in the condenser shell, and air from a fan or the like is supplied to the plurality of heat transfer tubes, causing the air to exchange heat with the steam to cool the steam.

[0088] Therefore, even if the turbine protection plate 60 is installed in the condenser housing, it is not possible to prevent steam from the bypass line 26 from flowing into the steam turbine 11. Furthermore, even if the heat transfer tube group is covered with the heat transfer tube protection net 61, it is not possible to prevent foreign matter from adhering to the outer circumference of the heat transfer tubes. Therefore, if the condenser 13 is an air-cooled condenser, the protection plate installation step (S13) and the protection net installation step (S14) are not performed.

[0089] As described above, when the protection plate setting step ( S13 ) and the protection net setting step ( S14 ) are not performed, the circulation line setting step ( S32 ) can be performed without stopping the condensation pump 21 and the water supply pump 22 at the end of the purging step ( S20 ).

[0090] In the above embodiment, the water accumulated in the water blowing tank 53 is sent to the wastewater treatment device 20. However, only the upstream water with less foreign matter accumulated in the water blowing tank 53 may be discharged to a river or the like.

[0091] Postscript

[0092] The steam turbine plant in the above embodiment can be understood as follows, for example.

[0093] (1) A steam turbine plant according to a first aspect includes:

[0094] a boiler 10 capable of generating steam; a steam turbine 11 capable of being driven by the steam from the boiler 10; a condenser 13 capable of restoring the steam discharged from the steam turbine 11 to water; a condensate pump 21 capable of pressurizing the water from the condenser 13; a main steam line 23 for guiding the steam generated in the boiler 10 to the steam turbine 11; a steam stop valve 24 provided in the main steam line 23 and capable of preventing the flow of steam into the steam turbine 11; a bypass line 26 branching from a position in the main steam line 23 closer to the boiler 10 than the steam stop valve 24 and connected to the condenser 13; a bypass valve 28 provided in the bypass line 26; a condensate line 32 for guiding the water in the condenser 13 to the condensate pump 21; a condensate outlet valve 33 provided in the condensate line 32; a water supply line 34 for guiding the water pressurized in the condensate pump 21 to the boiler 10; and a pure water supply device 15. The pure water supply device 15 includes a pure water tank 16 capable of storing pure water; a pure water line 17 for guiding the pure water in the pure water tank 16 to the condenser 13; a pure water pump 18 disposed in the pure water line 17; and a pure water regulating valve 19 disposed in the pure water line 17 on the condenser 13 side relative to the pure water pump 18. The steam turbine plant further includes a first connection portion 41 branching off from a position in the condensed water line 32 closer to the condenser 13 than the condensed water outlet valve 33; a second connection portion 42 branching off from a position in the condensed water line 32 closer to the condensed water pump 21 than the condensed water outlet valve 33; and a third connection portion 43 branching off from a position in the pure water line 17 closer to the condenser 13 than the pure water pump 18 and closer to the pure water tank 16 than the pure water regulating valve 19. The first connection portion 41 has a first connection seat 41s that can be connected to a first pipeline. The second connection portion 42 has a second connection seat 42s that can be connected to a second pipeline. The third connection portion 43 has a third connection seat 43s that can be connected to the second pipeline.

[0095] In the steam turbine equipment of this embodiment, during purging, the condensate pump 21 is driven with the steam shutoff valve 24, bypass valve 28, and condensate outlet valve 33 closed, and pure water is supplied to the condensate pump 21 from the second connection 42. This pure water then flows into the boiler 10 via the water supply line 34. The steam flowing into the boiler 10 flows into the condenser 13 via a portion of the main steam line 23 and the bypass line 26. This steam is converted into water within the condenser 13 and remains there. The water remaining in the condenser 13 is discharged through the condensate line 32 and the first connection 41 and recovered in a container such as a tank. In this manner, the steam turbine equipment of this embodiment can convert steam containing foreign matter into water and then recover it in a container, thereby reducing pollution and noise around the equipment.

[0096] Furthermore, in the steam turbine equipment of this embodiment, by connecting the second connection socket 42s and the third connection socket 43s with the second pipe, the pure water in the pure water tank 16 can be supplied to the condensate pump 21. Furthermore, in the steam turbine equipment of this embodiment, the first connection portion 41, the second connection portion 42, and the third connection portion 43 have connection sockets 41s, 42s, and 43s, respectively, making it possible to easily connect pipes to these connection portions 41, 42, and 43.

[0097] (2) Steam Turbine Equipment in Second Aspect In the steam turbine equipment in the first aspect, the first connection seat 41s, the second connection seat 42s, and the third connection seat 43s are all connection flanges.

[0098] In the steam turbine equipment of this embodiment, pipelines can be flange-connected to the first connection seat 41s, the second connection seat 42s, and the third connection seat 43s.

[0099] (3) The steam turbine equipment in the third embodiment is further provided with, in the steam turbine equipment in the first embodiment or the second embodiment, an inertial filter 29 which is arranged in the bypass line 26 on the side closer to the boiler 10 than the bypass valve 28 and which is capable of removing foreign matter contained in the steam flowing through the bypass line 26.

[0100] In the steam turbine plant of this embodiment, the amount of foreign matter flowing into the bypass valve 28 can be reduced during execution of the purging.

[0101] (4) The steam turbine equipment in the fourth mode is further provided with, in any steam turbine equipment in the first mode to the third mode, a wastewater treatment device 20 capable of purifying water from the water supply pipe 34; a water supply blowing pipe 37 branching from the water supply pipe 34 and guiding the water flowing through the water supply pipe 34 to the wastewater treatment device 20; a water supply blowing valve 38 provided in the water supply blowing pipe 37; and a water quality detector 36 connected to the water supply pipe 34 and capable of detecting the water quality of the water flowing through the water supply pipe 34.

[0102] In the steam turbine plant of this embodiment, if the contamination level of the water flowing through the water supply pipe 34 is high, a portion of the water flowing through the water supply pipe 34 can be sent to the wastewater treatment device 20 via the water supply blowing pipe 37. Therefore, in this embodiment, the contamination level of the water flowing through the water supply pipe 34 can be reduced.

[0103] (5) A steam turbine plant according to a fifth aspect is the steam turbine plant according to any one of the first to fourth aspects, further comprising a blow-off water recovery device 52 .

[0104] The blow-off water recovery device 52 includes a blow-off water tank 53 capable of temporarily storing water from the condenser 13; a blow-off water pipe 54 connecting the first connection socket 41s and the blow-off water tank 53 and guiding the water from the condenser 13 to the blow-off water tank 53; and a blow-off water valve 56 disposed in the blow-off water pipe 54. The first pipe is the blow-off water pipe 54.

[0105] In the steam turbine plant of this embodiment, during the execution of the purging, the water accumulated in the condenser 13 can be recovered in the blow water tank 53 via the condensed water line 32 , the first connection portion 41 , and the blow water line 54 .

[0106] (6) The steam turbine plant according to the sixth aspect further includes the steam turbine plant according to the fourth aspect, and further includes a blow-off water recovery device 52 .

[0107] The blow-off water recovery device 52 includes a blow-off water tank 53 capable of temporarily storing water from the condenser 13; a blow-off water pipe 54 connecting the first connection socket 41s and the blow-off water tank 53 and directing water from the condenser 13 to the blow-off water tank 53; a blow-off water valve 56 disposed in the blow-off water pipe 54; and a blow-off water discharge pipe 58 connecting the blow-off water tank 53 and the wastewater treatment device 20 and directing water in the blow-off water tank 53 to the wastewater treatment device 20. The first pipe is the blow-off water pipe 54.

[0108] In the steam turbine plant of this embodiment, during purging, water retained in the condenser 13 can be recovered in the blow water tank 53 via the condensed water line 32, the first connection portion 41, and the blow water line 54. Furthermore, in the steam turbine plant of this embodiment, the water retained in the blow water tank 53 can be sent to the wastewater treatment device 20.

[0109] (7) The steam turbine plant according to a seventh aspect is the steam turbine plant according to any one of the first to sixth aspects, further comprising a temporary pure water line 50 .

[0110] The temporary pure water pipeline 50 as the second pipeline can be connected to the second connecting seat 42s and the third connecting seat 43s.

[0111] In the steam turbine plant of this embodiment, the second connection block 42 s and the third connection block 43 s are connected by the temporary pure water line 50 serving as the second line, so that the pure water in the pure water tank 16 can be supplied to the condensate pump 21 .

[0112] (8) The steam turbine equipment according to an eighth aspect is the steam turbine equipment according to any one of the first to seventh aspects, further comprising a turbine guard plate 60 .

[0113] The condenser 13 includes a condenser shell 13c, into which steam from the steam turbine 11 and steam from the bypass line 26 can flow, and a heat transfer tube group 13t, disposed within the condenser shell 13c and composed of a plurality of heat transfer tubes. The turbine protection plate 60 is disposed within the condenser shell 13c, closer to the steam turbine 11 than the connection between the condenser shell 13c and the bypass line 26, and is configured to prevent steam from the bypass line 26 from flowing into the steam turbine 11.

[0114] In the steam turbine equipment of this embodiment, by providing the turbine protection plate in the condenser casing before the purging is performed, it is possible to suppress the steam from the bypass line 26 from flowing into the steam turbine 11 during the purging.

[0115] (9) A steam turbine plant according to a ninth aspect is the steam turbine plant according to any one of the first to seventh aspects, further comprising a heat transfer tube protection net 61 .

[0116] The condenser 13 includes a condenser shell 13c into which steam from the steam turbine 11 and steam from the bypass line 26 can flow; and a heat transfer tube group 13t disposed within the condenser shell 13c and composed of a plurality of heat transfer tubes. The heat transfer tube protection net 61 can cover at least the side of the heat transfer tube group 13t into which steam from the bypass line 26 flows.

[0117] In the steam turbine equipment of this embodiment, by covering the heat transfer tube group 13 t with the heat transfer tube protection net 61 before purging, foreign matter contained in the steam from the bypass line 26 can be prevented from adhering to the plurality of heat transfer tubes during purging.

[0118] Furthermore, the method for cleaning the steam turbine equipment in the above embodiment can be understood as follows, for example.

[0119] (10) The steam turbine equipment cleaning method according to the tenth aspect is applicable to the following steam turbine equipment.

[0120] The steam turbine equipment includes: a boiler 10 capable of generating steam; a steam turbine 11 capable of being driven by the steam from the boiler 10; a condenser 13 capable of recovering the steam exhausted from the steam turbine 11 into water; a condensate pump 21 capable of increasing the pressure of the water from the condenser 13; a main steam line 23 for guiding the steam generated in the boiler 10 to the steam turbine 11; a steam stop valve 24 provided in the main steam line 23 and capable of preventing the steam from flowing into the steam turbine 11; and a bypass line 26 provided in the main steam line 23. It branches off from a position closer to the boiler 10 than the steam stop valve 24 and is connected to the condenser 13; a bypass valve 28 is arranged in the bypass pipe 26; a condensate pipe 32 guides the water in the condenser 13 to the condensate pump 21; a condensate outlet valve 33 is arranged in the condensate pipe 32; a water supply pipe 34 guides the water pressurized in the condensate pump 21 to the boiler 10; and a pure water supply device 15, which has a pure water tank 16 capable of storing pure water and can supply the pure water in the pure water tank 16 to the condenser 13.

[0121] In the cleaning method, a preparation step (S10) and a purge step (S20) are performed. The preparation step (S10) includes: a water-blowing recovery device installation step (S11), in which a water-blowing recovery device 52 is connected to the condensed water pipeline 32 at a position closer to the condenser 13 than the condensed water outlet valve 33, and the water-blowing recovery device 52 has a water-blowing tank 53 capable of temporarily storing water from the condenser 13; and a temporary pure water pipeline connection step (S12), in which a temporary pure water pipeline 50 is connected to the condensed water pipeline 32 at a position closer to the condensate pump 21 than the condensed water outlet valve 33 to deliver water in the pure water tank 16. The purging process (S20) includes: a purging pipeline setting process (S21), closing the steam stop valve 24 and the condensate outlet valve 33, and opening the bypass valve 28; a pure water supply process (S22), supplying the pure water in the pure water tank 16 to the boiler 10 via the temporary pure water pipeline 50, the condensate pump 21 and the water supply pipeline 34; a steam supply process (S23), heating the pure water supplied to the boiler 10 in the pure water supply process (S22) in the boiler 10 to generate steam, guiding the steam generated in the boiler 10 to the condenser 13 via the main steam pipeline 23 and the bypass pipeline 26, and restoring the steam guided to the condenser 13 to water in the condenser 13; and a blowing water recovery process (S24), sending the water retained in the condenser 13 in the steam supply process (S23) to the blowing water tank 53.

[0122] In this embodiment, in the pure water supply step (S22) of the purge step (S20), pure water in the pure water tank 16 is supplied to the boiler 10 via the temporary pure water line 50, the condensate pump 21, and the water supply line 34. In the steam supply step (S23) of the purge step (S20), pure water is heated in the boiler 10 to generate steam, which is then guided to the condenser 13 via the main steam line 23 and the bypass line 26. The steam guided to the condenser 13 is then converted into water within the condenser 13. In the blow-off water recovery step (S24) of the purge step (S20), water remaining in the condenser 13 is sent to the blow-off water tank 53.

[0123] As described above, in this embodiment, steam containing foreign matter is converted into water and then recovered in the water blowing tank 53 , thereby suppressing contamination and noise around the equipment.

[0124] (11) The cleaning method of the steam turbine equipment in the eleventh embodiment In the cleaning method of the steam turbine equipment in the tenth embodiment, the preparation process (S10) includes: a protective plate setting process (S13) in which a turbine protective plate 60 for suppressing the steam from the bypass line 26 from flowing into the steam turbine 11 is set at a position closer to the side of the steam turbine 11 than the position where the steam from the bypass line 26 flows into the condenser 13.

[0125] In this embodiment, during execution of the purging step ( S20 ), it is possible to suppress the steam from the bypass line 26 from flowing into the steam turbine 11 .

[0126] (12) The cleaning method of the steam turbine equipment in the twelfth embodiment In the cleaning method of the steam turbine equipment in the tenth embodiment or the eleventh embodiment, the condenser 13 has: a condenser shell 13c, which can flow with steam from the steam turbine 11 and steam from the bypass line 26; and a heat transfer tube group 13t, which is arranged in the condenser shell 13c and is composed of a plurality of heat transfer tubes. The plurality of heat transfer tubes can cause the steam flowing into the condenser shell 13c to exchange heat with the cooling medium CM to condense the steam.

[0127] The preparation step ( S10 ) includes a protection net setting step ( S14 ) of covering at least one side of the heat transfer tube group 13 t into which steam from the bypass line 26 flows with a heat transfer tube protection net 61 .

[0128] In this embodiment, during the execution of the purge step ( S20 ), it is possible to suppress the steam from the bypass line 26 from adhering to the outer periphery of the heat transfer tube.

[0129] (13) The cleaning method for a steam turbine device in the thirteenth embodiment In the cleaning method for a steam turbine device in any one of the tenth to twelfth embodiments, the purging process (S20) further includes: a foreign matter detection process (S25) for detecting the amount of foreign matter contained in the steam flowing from the bypass line 26 into the condenser 13 or the amount of foreign matter contained in the water flowing from the condenser 13 into the water blowing tank 53; and a foreign matter amount judgment process (S26) for judging whether the amount of foreign matter is less than a predetermined amount.

[0130] In the foreign matter amount determination step ( S26 ), the purging step ( S20 ) is terminated on the condition that the foreign matter amount is determined to be less than a preset amount.

[0131] In this embodiment, the purging step ( S20 ) can be ended when the amount of foreign matter contained in the steam flowing from the bypass line 26 into the condenser 13 or the amount of foreign matter contained in the water flowing from the condenser 13 into the water blow tank 53 becomes small.

[0132] (14) The cleaning method of the steam turbine equipment in the fourteenth embodiment In the cleaning method of the steam turbine equipment in the thirteenth embodiment, after the purge process (S20), a circulation pipeline setting process (S32), a circulation process (S33) and a water quality detection process (S34) are further performed.

[0133] In the circulation line setting step ( S32 ), the steam stop valve 24 is closed, and the bypass valve 28 and the condensate outlet valve 33 are opened. In the circulation step ( S33 ), the water in the condenser 13 is supplied to the boiler 10 via the condensate line 32 , the condensate outlet valve 33 , the condensate pump 21 , and the water supply line 34 . The water is heated in the boiler 10 to generate steam. The steam generated in the boiler 10 is guided to the condenser 13 via the main steam line 23 and the bypass line 26 , and the steam guided to the condenser 13 is converted into water in the condenser 13. In the water quality testing step ( S34 ), the quality of the water from the condenser 13 is tested.

[0134] In this embodiment, after the purge step ( S20 ), a circulation step ( S33 ) is executed to supply the water in the condenser 13 to the boiler 10 via the condensate line 32 , the condensate outlet valve 33 , the condensate pump 21 , and the water supply line 34 . Furthermore, the water is heated in the boiler 10 to generate steam, which is then guided to the condenser 13 via the main steam line 23 and the bypass line 26 , where it is converted back into water. In this embodiment, during the circulation step ( S33 ), a water quality testing step ( S34 ) is executed to test the quality of the water from the condenser 13. Therefore, in this embodiment, the contamination level of the steam to be supplied to the steam turbine 11 can be confirmed before supplying steam from the boiler 10 to the steam turbine 11 and commencing operation of the steam turbine facility.

[0135] (15) The cleaning method of the steam turbine equipment in the fifteenth embodiment In the cleaning method of the steam turbine equipment in the fourteenth embodiment, when the water quality detected in the water quality detection process (S34) is above the pre-set contamination level, the water flowing through the water supply pipe 34 is further blown to the water supply blowing process (S36) of the purifiable wastewater treatment device 20.

[0136] In the circulation step (S33), if the water quality detected in the water quality detection step (S34) is lower than a preset pollution level, the circulation step (S33) and the water supply blowing step (S36) are terminated.

[0137] In this method, if the water quality detected in the water quality detection step (S34) is above a predetermined contamination level, the water flowing through the water supply pipe 34 is blown to the wastewater treatment device 20 where it can be purified. Furthermore, in the circulation step (S33), if the water quality detected in the water quality detection step (S34) is below a predetermined contamination level, the circulation step (S33) and the water supply blowing step (S36) are terminated. Therefore, in this method, the contamination level of the steam scheduled to be supplied to the steam turbine 11 can be reduced to a contamination level that can be supplied to the steam turbine 11 before starting operation of the steam turbine plant. The contamination level that can be supplied to the steam turbine 11 is a pre-set contamination level that can suppress damage to the steam turbine 11 even if steam is supplied to the steam turbine 11.

[0138] Industrial applicability

[0139] In one aspect of the present invention, during the execution of the purge, steam containing foreign matter can be converted into water and then recovered in a container or the like, thereby suppressing contamination and noise around the equipment.

[0140] Explanation of symbols

[0141] A-Permanent Unit, 10-Boiler, 11-Steam Turbine, 11k-Turbine Rotor, 11c-Turbine Housing, 12-Generator, 13-Condenser, 13c-Condenser Housing, 13ci-Steam Inlet Opening, 13ch-Hot Well, 13t-Heat Transfer Tube Group, 15-Pure Water Supply Device, 16-Pure Water Tank, 17-Pure Water Pipeline, 18-Pure Water Pump, 19-Pure Water Control Valve, 20-Wastewater Treatment Device, 21-Condensate Pump, 22-Water Supply Pump, 23-main steam pipeline, 24-steam stop valve, 25-steam regulating valve, 26-bypass pipeline, 26u-upstream straight pipe, 26c-bend part, 26d-downstream straight pipe, 27-target insertion part, 28-bypass valve, 29-inertial filter, 29p-straight pipe, 29bf-blind flange, 30-bypass steam blowing pipeline, 31-bypass steam blowing valve, 32-condensate pipeline, 33-condensate outlet valve, 34-supply Water pipe, 35-water supply regulating valve, 36-water quality detector, 37-water supply blowing pipe, 38-water supply blowing valve, 41-first connection part, 41p-first branch pipe, 41s-first connection seat, 41bf-blind flange, 42-second connection part, 42p-second branch pipe, 42s-second connection seat, 42bf-blind flange, 43-third connection part, 43p-third branch pipe, 43s-third connection seat, 43bf-blind flange Edge, 44-fourth connecting part, 44p-through pipe, 44s-fourth connecting seat, 44bf-blind flange, B-temporary part, 50-temporary pure water pipeline, 51-temporary pure water regulating valve, 52-blowing water recovery device, 53-blowing water tank, 54-blowing water pipeline, 55-blowing water pump, 56-blowing water valve, 57-sampling nozzle, 58-blowing water discharge pipeline, 59-blowing water discharge pump, 60-turbine protection plate, 61-heat transfer tube protection net, 62-target.

Claims

1. A steam turbine plant comprising: boiler, capable of generating steam; a steam turbine capable of being driven by steam from the boiler; a condenser capable of recovering steam exhausted from the steam turbine into water; a condensate pump capable of increasing the pressure of water from the condenser; a main steam line for guiding the steam generated in the boiler to the steam turbine; a steam stop valve, disposed in the main steam pipeline and capable of preventing steam from flowing into the steam turbine; a bypass line branching from the main steam line at a position closer to the boiler than the steam stop valve and connected to the condenser; a bypass valve, disposed in the bypass line; a condensate water pipeline, guiding the water in the condenser to the condensate pump; a condensate outlet valve, arranged in the condensate pipeline; a water supply pipeline for guiding the water pressurized in the condensate pump to the boiler; The pure water supply device comprises: a pure water tank capable of storing pure water; a pure water pipeline, guiding the pure water in the pure water tank to the condenser; a pure water pump disposed in the pure water pipeline; and a pure water regulating valve disposed in the pure water pipeline on a side closer to the condenser than the pure water pump; a first connection portion, in the condensed water pipeline, branching from a position closer to the condenser than the condensed water outlet valve; a second connecting portion, in the condensate pipeline, branching from a position closer to the condensate pump than the condensate outlet valve; and The third connection portion branches off from a position in the pure water pipeline that is closer to the condenser than the pure water pump and closer to the pure water tank than the pure water regulating valve. The first connecting portion has a first connecting seat that can be connected to the first pipeline. The second connecting portion has a second connecting seat that can be connected to the second pipeline. The third connecting portion has a third connecting seat that can be connected to the second pipeline.

2. The steam turbine plant according to claim 1, wherein: The first connecting seat, the second connecting seat and the third connecting seat are all connecting flanges.

3. The steam turbine device according to claim 1 or 2, The steam turbine equipment further includes an inertial filter that is provided in the bypass line on a side closer to the boiler than the bypass valve and that can remove foreign matter contained in steam flowing through the bypass line.

4. The steam turbine plant according to claim 1 or 2, further comprising: a wastewater treatment device capable of purifying water from the water supply line; a water supply blowing pipeline branching from the water supply pipeline and guiding the water flowing through the water supply pipeline to the wastewater treatment device; a water supply blowing valve, disposed in the water supply blowing pipeline; and The water quality detector is connected to the water supply pipeline and can detect the water quality of the water flowing through the water supply pipeline.

5. The steam turbine device according to claim 1 or 2, The steam turbine equipment further includes a blow-off water recovery device. The blow-off water recovery device comprises: a blow water tank capable of temporarily storing water from the condenser; a water blowing pipeline, connecting the first connecting seat and the water blowing tank, and guiding the water from the condenser to the water blowing tank; and The water blowing valve is arranged in the water blowing pipeline. The first pipeline is the water blowing pipeline.

6. The steam turbine plant according to claim 4, The steam turbine equipment further includes a blow-off water recovery device. The blow-off water recovery device comprises: a blow water tank capable of temporarily storing water from the condenser; a water blowing pipeline, connecting the first connecting seat and the water blowing tank, and guiding the water from the condenser to the water blowing tank; a water blowing valve, disposed in the water blowing pipeline; and The water blowing discharge pipe connects the water blowing tank and the wastewater treatment device and guides the water in the water blowing tank to the wastewater treatment device. The first pipeline is the water blowing pipeline.

7. The steam turbine plant according to claim 1 or 2, The steam turbine equipment is also equipped with a temporary pure water pipeline. The temporary pure water pipeline as the second pipeline can be connected to the second connecting seat and the third connecting seat.

8. The steam turbine device according to claim 1 or 2, The steam turbine equipment further comprises a turbine protection plate, The condenser includes: a condenser shell, into which the steam from the steam turbine and the steam from the bypass line can flow; and a heat transfer tube group, which is arranged in the condenser shell and consists of a plurality of heat transfer tubes. The turbine protection plate is provided in the condenser housing on a side closer to the steam turbine than a connection position between the condenser housing and the bypass line, and can suppress the steam from the bypass line from flowing into the steam turbine.

9. The steam turbine plant according to claim 1 or 2, The steam turbine equipment is also provided with a heat transfer tube protection net. The condenser includes: a condenser shell, into which the steam from the steam turbine and the steam from the bypass line can flow; and a heat transfer tube group, which is arranged in the condenser shell and consists of a plurality of heat transfer tubes. The heat transfer tube protection net can cover at least one side of the heat transfer tube group into which the steam from the bypass line flows.

10. A method for cleaning a steam turbine device, the steam turbine device comprising: boiler, capable of generating steam; a steam turbine capable of being driven by steam from the boiler; a condenser capable of recovering steam exhausted from the steam turbine into water; a condensate pump capable of increasing the pressure of water from the condenser; a main steam line for guiding the steam generated in the boiler to the steam turbine; a steam stop valve, disposed in the main steam pipeline and capable of preventing steam from flowing into the steam turbine; a bypass line branching from the main steam line at a position closer to the boiler than the steam stop valve and connected to the condenser; a bypass valve, disposed in the bypass line; a condensate water pipeline, guiding the water in the condenser to the condensate pump; a condensate outlet valve, arranged in the condensate pipeline; a water supply pipeline for guiding the water pressurized in the condensate pump to the boiler; and A pure water supply device includes a pure water tank capable of storing pure water and capable of supplying the pure water in the pure water tank to the condenser. In the steam turbine equipment cleaning method, Perform preparation and purging procedures, The preparation process includes: a blow-off water recovery device installation step, connecting a blow-off water recovery device to the condensed water pipeline at a position closer to the condenser than the condensed water outlet valve, the blow-off water recovery device having a blow-off water tank capable of temporarily storing water from the condenser; and A temporary pure water pipeline connecting step is performed, in the condensed water pipeline, at a position closer to the condensate pump than the condensed water outlet valve, to deliver the water in the pure water tank. The purging process includes: A purge pipeline setting process is to close the steam stop valve and the condensate outlet valve, and open the bypass valve; a pure water supply step of supplying the pure water in the pure water tank to the boiler via the temporary pure water pipeline, the condensation pump, and the water supply pipeline; a steam supplying step of heating the pure water supplied to the boiler in the pure water supplying step in the boiler to generate steam, guiding the steam generated in the boiler to a condenser via the main steam line and the bypass line, and converting the steam guided to the condenser into water in the condenser; and The blow water recovery step sends the water retained in the condenser during the steam supply step to the blow water tank.

11. The method for cleaning steam turbine equipment according to claim 10, wherein: The preparation step includes a protection plate installation step of installing a turbine protection plate for suppressing steam from the bypass line from flowing into the steam turbine at a position closer to the steam turbine than a position where steam from the bypass line flows into the condenser.

12. The steam turbine equipment cleaning method according to claim 10 or 11, wherein: The condenser includes: a condenser shell, into which the steam from the steam turbine and the steam from the bypass line can flow; and a heat transfer tube group, arranged in the condenser shell and composed of a plurality of heat transfer tubes, the plurality of heat transfer tubes being capable of exchanging heat between the steam flowing into the condenser shell and a cooling medium to condense the steam. The preparation step includes a protective net setting step of covering at least one side of the heat transfer tube group into which steam from the bypass line flows with a heat transfer tube protective net.

13. The method for cleaning steam turbine equipment according to claim 10 or 11, wherein: The purging process also includes: a foreign matter detecting step of detecting the amount of foreign matter contained in the steam flowing from the bypass line into the condenser or the amount of foreign matter contained in the water flowing from the condenser into the water blowing tank; and The foreign matter amount judging step is to judge whether the foreign matter amount is less than a preset amount. In the foreign matter amount determination step, the purging step is terminated on the condition that it is determined that the foreign matter amount is smaller than a preset amount.

14. The method for cleaning steam turbine equipment according to claim 13, wherein: After the purge process, the circulation pipeline setting process, circulation process and water quality testing process are further performed. In the circulation line setting process, the steam stop valve is closed, and the bypass valve and the condensate outlet valve are opened. In the circulation process, the water in the condenser is supplied to the boiler via the condensed water pipeline, the condensed water outlet valve, the condensate pump, and the water supply pipeline, and the water is heated in the boiler to generate steam. The steam generated in the boiler is guided to the condenser via the main steam pipeline and the bypass pipeline, and the steam guided to the condenser is converted into water in the condenser. In the water quality detection step, the water quality of the water from the condenser is detected.

15. The method for cleaning steam turbine equipment according to claim 14, wherein: If the water quality detected in the water quality detection step is above a preset contamination level, a water supply blowing step is further performed to blow the water flowing through the water supply pipe to a purifiable wastewater treatment device. In the circulation step, if the water quality detected in the water quality detection step is lower than a preset contamination level, the circulation step and the water supply and blowing step are terminated.

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