WO2022059331A1 - 蒸気タービンプラント、及びそのクリーニング方法 - Google Patents
蒸気タービンプラント、及びそのクリーニング方法 Download PDFInfo
- Publication number
- WO2022059331A1 WO2022059331A1 PCT/JP2021/027024 JP2021027024W WO2022059331A1 WO 2022059331 A1 WO2022059331 A1 WO 2022059331A1 JP 2021027024 W JP2021027024 W JP 2021027024W WO 2022059331 A1 WO2022059331 A1 WO 2022059331A1
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- WIPO (PCT)
- Prior art keywords
- water
- line
- steam
- condenser
- steam turbine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/32—Collecting of condensation water; Drainage ; Removing solid particles
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
- F01D17/12—Final actuators arranged in stator parts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
- F01D25/002—Cleaning of turbomachines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2220/00—Application
- F05D2220/30—Application in turbines
- F05D2220/31—Application in turbines in steam turbines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/60—Fluid transfer
- F05D2260/606—Bypassing the fluid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2260/00—Function
- F05D2260/60—Fluid transfer
- F05D2260/607—Preventing clogging or obstruction of flow paths by dirt, dust, or foreign particles
Definitions
- the present disclosure relates to a steam turbine plant including a boiler and a steam turbine, and a cleaning method thereof.
- a steam turbine plant generally includes a boiler, a steam turbine driven by steam from the boiler, a condenser that returns the steam exhausted from the steam turbine to water, and various pumps such as a condenser pump and a water supply pump.
- the main steam line that guides the steam generated in the boiler to the steam turbine, the steam stop valve installed in the main steam line, and the water that guides the water in the condenser to the boiler via the condenser pump, water supply pump, etc. It is provided with a line, a bypass line branched from a position on the boiler side of the steam stop valve in the main steam line and connected to the condenser, and a bypass valve provided in the bypass line.
- blow-out or flushing is performed in order to remove foreign matter after its construction or repair.
- Patent Document 1 A method for cleaning a steam turbine plant is disclosed in, for example, Patent Document 1 below.
- a temporary pipe is installed prior to the execution of blowing out.
- One end of this hypothetical pipe is connected to a bypass valve, and the other end of the temporary pipe is connected to a discharge pipe via various lines.
- steam is generated in the boiler, and this steam is discharged from the discharge pipe to the atmosphere via the main steam line, the bypass line, the bypass valve, the temporary piping, and various lines. That is, in this blowing out, the steam generated in the boiler is released to the atmosphere through a temporary pipe or the like without flowing into the steam turbine, so that the foreign matter remaining in the pipe is released to the atmosphere together with the steam.
- Patent Document 1 has a problem that foreign matter remaining in the pipe is released into the atmosphere together with steam, which contaminates the surroundings of the plant and is accompanied by noise when the steam is released into the atmosphere.
- the steam turbine plant as one aspect for achieving the above object is A boiler that can generate steam, a steam turbine that can be driven by steam from the boiler, a water recovery device that can return the steam exhausted from the steam turbine to water, and boosting the water from the water recovery device.
- a possible condensate pump a main steam line that can guide the steam generated in the boiler to the steam turbine, and a steam stop valve that is provided in the main steam line and can stop the inflow of steam to the steam turbine.
- the bypass line branched from the position on the boiler side of the steam stop valve in the main steam line and connected to the water recovery device, the bypass valve provided in the bypass line, and the above.
- the pure water supply device includes a pure water tank capable of storing pure water, a pure water line for guiding the pure water in the pure water tank to the water recovery device, and pure water provided in the pure water line. It has a pump and a pure water control valve provided on the side of the water condensing device with respect to the pure water pump in the pure water line.
- the steam turbine plant further has a first connection branching from a position closer to the condenser than the condenser outlet valve in the condenser line, and the condenser in the condenser line.
- the second connection portion branched from the position on the side of the condensate pump with respect to the water outlet valve, and the deionizer on the side of the condensate with respect to the pure water pump in the pure water line and the pure water adjustment. It is provided with a third connection portion branching from a position on the side of the pure water tank with respect to the valve.
- the first connection portion has a first connection seat that can be connected to the first line.
- the second connecting portion has a second connecting seat that can be connected to the second line.
- the third connection portion has a third connection seat that can be connected to the second line.
- the condensate pump when the blow-out is performed, the condensate pump is driven with the steam stop valve, the bypass valve, and the condensate outlet valve closed, and the condensate pump is purely connected to the condensate pump from the second connection portion.
- Supply water As a result, this pure water flows into the boiler via the water supply line.
- the steam that has flowed into the boiler flows into the condenser through a part of the main steam line and the bypass line.
- This steam returns to the water in the condenser and collects in the condenser.
- the water collected in the condenser is discharged from the condenser line and the first connection portion, and is collected in a container such as a tank.
- steam containing foreign substances can be returned to water and then recovered in a container, so that pollution and noise around the plant can be suppressed.
- the pure water in the pure water tank can be supplied to the condensate pump.
- a line can be easily connected to these connection portions.
- This steam turbine plant includes a boiler capable of generating steam, a steam turbine driven by steam from the boiler, a water recovery device capable of returning steam exhausted from the steam turbine to water, and the water recovery device.
- a condensate pump capable of boosting water from the steam, a main steam line that can guide steam generated in the boiler to the steam turbine, and a main steam line that can stop the inflow of steam to the steam turbine.
- the steam stop valve, the bypass line branched from the position on the boiler side of the steam stop valve in the main steam line, and connected to the water condenser, and the bypass line are provided.
- the bypass valve, the condensate line that can guide the water in the condensate to the condensate pump, the confluence outlet valve provided in the condensate line, and the steam boosted by the confluence pump are used in the boiler. It is provided with a water supply line that can lead to a water supply line and a pure water supply device that has a pure water tank capable of storing pure water and can supply the pure water in the pure water tank to the water recovery device.
- a preparation step and a blowing-out step are performed.
- the preparatory step has a blowing water tank capable of temporarily storing water from the condenser at a position closer to the condenser than the condenser outlet valve in the condenser line.
- the water in the pure water tank can be sent to a position closer to the condensate pump than the condensate outlet valve.
- the blowing out step is performed via a blowing outline setting step of closing the steam stop valve and the condensate outlet valve and opening the bypass valve, and the provisional pure water line, the condensate pump, and the water supply line.
- the pure water supply step of supplying the pure water in the pure water tank to the boiler and the pure water supplied to the boiler in the pure water supply step are heated in the boiler to generate steam, and the main steam is generated.
- a steam supply step of guiding the steam generated in the boiler to the water recovery device via the line and the bypass line, and returning the steam guided to the water recovery device to water in the water recovery device, and the steam supply step. Includes a blowing water recovery step of sending the water accumulated in the water recovery device to the blowing water tank.
- the pure water in the pure water tank is supplied to the boiler via the temporary pure water line, the condensate pump, and the water supply line.
- pure water is heated in the boiler to generate steam, and this steam is guided to the condenser via the main steam line and the bypass line, and is guided to the condenser. Return the steam to water in the condenser.
- the water accumulated in the condenser is sent to the blowing water tank. As described above, in this embodiment, the steam containing foreign matter is returned to water and then collected in the blowing water tank, so that pollution and noise around the plant can be suppressed.
- steam containing foreign matter can be returned to water during the blowing out, and then recovered in a container or the like, so that contamination and noise around the plant can be suppressed.
- the steam turbine plant of the present embodiment will be described with reference to FIGS. 1 to 3.
- the steam turbine plant of the present embodiment includes a permanent part and a temporary part.
- the permanent part A of the steam turbine plant includes a boiler 10, a steam turbine 11, a condenser 13, a pure water supply device 15, a wastewater treatment device 20, and a condenser pump 21.
- a condensate line 32, a condensate outlet valve 33, a water supply line 34, a water supply control valve 35, a water quality detector 36, a water supply blow line 37, and a water supply blow valve 38 are provided.
- the boiler 10 can heat water to generate steam.
- the steam turbine 11 has 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.
- the rotor of the generator 12 is connected to the turbine rotor 11r.
- the condenser 13 has a condenser casing 13c and a heat transfer tube group 13t arranged in the condenser casing 13c and composed of a plurality of heat transfer tubes.
- the condenser casing 13c has a steam inflow opening 13ci that guides the steam exhausted from the steam turbine 11 to the inside of the condenser casing 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, river water, or the like.
- the steam exhausted from the steam turbine 11 is cooled by the cooling medium CM flowing in the heat transfer tube to become water.
- this water may be referred to as condensate.
- the portion of the condenser casing 13c below the heat transfer tube group 13t forms a hot well 13ch. Condensate collects in this hot well 13ch.
- the pure water supply device 15 is provided in 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 into the water recovery device casing 13c, and a pure water line 17. It has a pure water pump 18 and a pure water control valve 19 arranged on the water recovery device 13 side of the pure water pump 18 in the pure water line 17.
- the pure water control valve 19 opens when the amount of condensate in the condenser casing 13c decreases, and the pure water in the pure water tank 16 is replenished in the condenser casing 13c as condensate.
- the main steam line 23 connects the steam outlet of the boiler 10 and the steam inlet of the turbine casing 11c.
- the main steam line 23 is provided with a steam stop valve 24 for stopping the inflow of steam into the steam turbine 11 and a steam control valve 25 for adjusting the flow rate of the steam flowing into the steam turbine 11.
- the bypass line 26 branches from the position on the boiler 10 side of the steam stop valve 24 in the main steam line 23.
- the bypass line 26 is connected to the condenser casing 13c.
- the bypass line 26 is provided with a bypass valve 28 and an inertial filter 29.
- the bypass line 26 has an upstream side straight pipe portion 26u, a bent portion 26c, and a downstream side straight pipe portion 26d.
- a portion from the bent portion 26c to the boiler 10 side at a certain distance forms the upstream straight pipe portion 26u.
- a portion from the bent portion 26c to the condenser 13 side at a certain distance forms a downstream straight pipe portion 26d.
- the downstream straight pipe portion 26d forms a predetermined angle (for example, 90 °) with respect to the upstream straight pipe portion 26u.
- the inertial filter 29 has a straight pipe 29p connected to the side opposite to the upstream straight pipe portion 26u with reference to the bent portion 26c, and a blind flange 29bf that closes the end of the straight pipe 29p.
- the direction in which the straight pipe 29p of the inertial filter 29 extends is the same as the direction in which the upstream straight pipe portion 26u of the bypass line 26 extends. Therefore, the straight pipe 29p of the inertial filter 29 and the upstream straight pipe portion 26u of the bypass line 26 are located on the same straight line.
- the bypass valve 28 is connected to the tip of the straight pipe portion 26d on the downstream side of the bypass line 26.
- the foreign matter F having a large mass in the steam flowing through the bypass line 26 goes straight from the upstream straight pipe portion 26u, passes through the bent portion 26c, and flows into the inertial filter 29. As a result, the foreign matter F having a large mass in the steam is captured by the inertial filter 29. Therefore, the amount of foreign matter F in the steam that has passed through the bent portion 26c and has flowed into the downstream straight pipe portion 26d is reduced, and is contained in the steam passing through the bypass valve 28 and the steam flowing into the condenser 13. It is possible to reduce the amount of foreign matter F.
- a bypass steam blow line 30 is connected to the straight pipe 29p of the inertial filter 29.
- the bypass steam blow line 30 is also connected to the condenser casing 13c like the bypass line 26.
- the bypass steam blow line 30 is provided with a bypass steam blow valve 31.
- a target insertion portion 27 is provided at a position on the condenser 13 side of the bypass valve 28 in the bypass line 26.
- the target insertion portion 27 is a portion capable of inserting the target 62 that blocks a part of the bypass line 26 into the bypass line 26.
- the target 62 is, for example, an iron plate.
- connection position between the bypass line 26 and the condenser casing 13c and the connection position between the bypass steam blow line 30 and the condenser casing 13c are both in the condenser casing 13c. It is a position on the steam turbine 11 side of the position where the heat transfer tube group 13t is arranged.
- the condensate line 32 connects the hot well 13ch of the condensate casing 13c and the suction port of the condensate pump 21.
- the condensate line 32 is provided with a condensate outlet valve 33.
- the water supply line 34 connects the discharge port of the condensate pump 21 and the water inlet of the boiler 10.
- the water supply line 34 is provided with a water supply pump 22 that boosts the water from the condensate pump 21 and sends it to the boiler 10.
- a water supply control valve 35 for adjusting the flow rate of water sent to the boiler 10 is provided at a position on the boiler 10 side of the water supply pump 22 in the water supply line 34.
- the water quality detector 36 is connected to the position on the condensate pump 21 side of the water supply pump 22. The water quality detector 36 detects the degree of pollution of water flowing through the water supply line 34.
- the water supply blow line 37 is connected to the position on the condensate pump 21 side of the connection position of the water quality detector 36.
- a wastewater treatment device 20 is connected to the tip of the water supply blow line 37.
- the wastewater treatment device 20 purifies the water flowing through the water supply line 34.
- the water supply blow line 37 is connected to the wastewater treatment device 20 so as to communicate with the treated water receiving space that receives the water to be purified in the wastewater treatment device 20.
- the water supply blow line 37 is provided with a water supply blow valve 38.
- the water supply blow valve 38 opens when the degree of pollution detected by the water quality detector 36 is equal to or higher than a predetermined degree of pollution.
- the permanent unit A of the steam turbine 11 plant further includes a first connection unit 41, a second connection unit 42, a third connection unit 43, and a fourth connection unit 44.
- the first connection portion 41 is a first connection seat 41s that can be connected to the first line, and a first branch pipe that branches from the position on the condenser 13 side of the condenser outlet valve 33 in the condenser line 32. It has 41p and.
- the first connecting seat 41s is a connecting flange and is provided at the end of the first branch pipe 41p.
- the second connection portion 42 is a second connection seat 42s that can be connected to the second line, and a second branch pipe that branches from the position on the condensate pump 21 side of the condensate outlet valve 33 in the condensate line 32. It has 42p and.
- the second connecting seat 42s is a connecting flange and is provided at the end of the second branch pipe 42p.
- the third connection portion 43 is a third connection seat 43s that can be connected to the second line, and in the pure water line 17, the condenser 13 side is closer to the condenser 13 than the pure water pump 18, and the pure water is higher than the pure water control valve 19. It has a third branch pipe 43p, which is branched from the position on the tank 16 side.
- the third connecting seat 43s is a connecting flange, and is provided at the end of the third branch pipe 43p.
- the fourth connecting portion 44 has a fourth connecting seat 44s that can be connected to the third line, and a communication pipe 44p that communicates with the treated water receiving space of the wastewater treatment device 20.
- the fourth connecting seat 44s is a connecting flange and is provided at the end of the communication pipe 44p. Blind flanges 41bf, 42bf, 43bf, 44bf are connected to the connection seats 41s, 42s, 43s, 44s.
- the steam turbine plant can operate the steam turbine 11 from the start of the steam turbine 11 only in the permanent part A described above.
- the condensate outlet valve 33, the water supply control valve 35 and the bypass valve 28 are open, and the bypass steam blow valve 31 and the water supply blow valve 38 are closed.
- the condensate pump 21 and the water supply pump 22 are driven in the above state to supply the water in 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. This steam is cooled in the condenser 13 and returns to water.
- the steam condition is a condition of steam that can be supplied to the steam turbine 11.
- the steam condition is, for example, that the temperature of the steam becomes a predetermined temperature or higher, and the amount of the steam generated becomes a predetermined amount or higher.
- the opening degree of the steam control valve 25 is controlled, for example, based on a request output signal from the outside.
- the water supply blow valve 38 opens. As a result, a part of the water flowing through the water supply line 34 flows into the wastewater treatment device 20. The wastewater treatment device 20 purifies this water and then discharges it to the outside.
- the pure water control valve 19 opens and the pure water pump 18 is driven. As a result, the water in the pure water tank 16 is replenished in the condenser casing 13c as condensate.
- the temporary portion B of the steam turbine plant includes a temporary pure water line 50, a temporary pure water control valve 51, a blowing water recovery device 52, a turbine protection plate 60, and a heat transfer tube protection net 61. , Target 62, and.
- the temporary pure water line 50 can be connected to the second connecting seat 42s and the third connecting seat 43s as the above-mentioned second line.
- the temporary pure water line 50 has a connection flange that can be connected to the second connection seat 42s, which is a connection flange, and a connection flange that can be connected to the third connection seat 43s, which is a connection flange.
- the temporary pure water control valve 51 is provided in the temporary pure water line 50.
- the blowing water recovery device 52 includes a blowing water tank 53, a blowing water line 54, a blowing water pump 55, a blowing water valve 56, a sampling nozzle 57, a blowing water discharge line 58, a blowing water discharge pump 59, and the like.
- the blowing water tank 53 is a tank capable of temporarily storing water from the condenser 13.
- the blowing water line 54 is a line that connects the first connecting seat 41s and the blowing water tank 53 and guides the water from the condenser 13 to the blowing water tank 53.
- the blowing water line 54 has a connection flange that can be connected to the first connection seat 41s, which is a connection flange.
- the blowing water line 54 is the first line described above.
- the blowing water line 54 is provided with a blowing water valve 56, a blowing water pump 55, and a sampling nozzle 57.
- the blowing water pump 55 is provided on the blowing water tank 53 side of the blowing water valve 56.
- the sampling nozzle 57 is provided on the blowing water tank 53 side of the blowing water pump 55.
- the blowing water discharge line 58 is a line that connects the blowing water tank 53 and the fourth connecting seat 44s and guides the water in the blowing water tank 53 to the wastewater treatment device 20.
- the blowing water discharge line 58 has a connection flange that can be connected to the fourth connection seat 44s, which is a connection flange.
- the blowing water discharge pump 59 is provided in the blowing water discharge line 58.
- the turbine protection plate 60 is located on the steam turbine 11 side in the condenser casing 13c from the connection position between the condenser casing 13c and the bypass line 26 and the connection position between the condenser casing 13c and the bypass steam blow line 30. It is a partition plate provided to partition the space inside the condenser casing 13c into the heat transfer tube group 13t side and the steam turbine 11 side.
- the heat transfer tube protection net 61 is a net capable of at least covering the side in which the steam from the bypass line 26 flows in in the heat transfer tube group 13t.
- the heat transfer tube protection net 61 is a net capable of at least covering the steam turbine 11 side in the heat transfer tube group 13t.
- the heat transfer tube protection net 61 is, for example, a wire mesh.
- the heat transfer tube protection net 61 is, for example, a net having 40 meshes per inch (25.4 mm).
- This preparation step (S10) includes a blowing water recovery device installation step (S11), a temporary pure water line connection step (S12), a protective plate installation step (S13), and a protective net installation step (S14).
- the blowing water recovery device 52 which is a part of the temporary section B, is connected to the permanent section A.
- the blowing water line 54 of the blowing water recovery device 52 is branded connected to the first connecting seat 41s connected to the condensate line 32.
- the blowing water discharge line 58 of the blowing water recovery device 52 is branded connected to the fourth connecting seat 44s connected to the wastewater treatment device 20.
- the temporary pure water line 50 provided with the temporary pure water control valve 51 is connected to the permanent portion A.
- the temporary pure water line 50 is flange-connected to the second connecting seat 42s connected to the condensate line 32, and the third connecting seat 43s connected to the pure water line 17 of the pure water supply device 15 is connected.
- the temporary pure water line 50 is flange-connected.
- the steam turbine is located in the condenser casing 13c from the connection position between the condenser casing 13c and the bypass line 26 and the connection position between the condenser casing 13c and the bypass steam blow line 30.
- a turbine protection plate 60 is provided on the 11 side.
- the space inside the condenser casing 13c is partitioned between the heat transfer tube group 13t side and the steam turbine 11 side by the turbine protection plate 60.
- the protection net installation step (S14) in the heat transfer tube group 13t of the condenser 13, the side where the steam from the bypass line 26 flows in is covered with the heat transfer tube protection net 61.
- this preparation step (S10) is a step of providing the temporary portion B in the permanent portion A.
- this line when connecting a part of the line of the temporary portion B to the permanent portion A, this line can be flanged to the permanent portion A, so that this line can be easily connected to the permanent portion A. can do.
- the blowing water recovery device installation process (S11), the temporary pure water line connection process (S12), the protective plate installation process (S13), and the protective net installation process (S14) are performed in any order in the preparation process (S10). You may execute it with.
- This blowing out step (S20) includes a blowing outline setting step (S21), a pure water supply step (S22), a steam supply step (S23), a blowing water recovery step (S24), a foreign matter detection step (S25), and a foreign matter amount.
- the determination step (S26) is included.
- the steam stop valve 24, the condensate outlet valve 33, the pure water control valve 19, and the water supply blow valve 38 are closed. Further, in this blow-out step (S20), the water supply control valve 35, the bypass valve 28, and the bypass steam blow valve 31 are opened.
- the pure water pump 18, the condensate pump 21, and the water supply pump 22 are driven.
- 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 control valve 35.
- the water supplied to the boiler 10 in the pure water supply step (S22) is heated in the boiler 10 to turn this water into steam.
- This steam flows into the condenser casing 13c via the main steam line 23, the bypass line 26, and the bypass steam blow line 30.
- the steam flowing into the condenser casing 13c is cooled by heat exchange with the cooling medium CM flowing in the plurality of heat transfer tubes in the condenser casing 13c to become water. This water collects in the hot well 13ch of the condenser casing 13c.
- the blowing water valve 56 is opened and the blowing water pump 55 is driven.
- the water collected in the hot well 13ch of the condenser 13 is sent to the blowing water tank 53 via the blowing water line 54 and the blowing water pump 55.
- the water supply line 34, the boiler 10, a part of the main steam line 23, the bypass line 26, and the condenser are restored.
- Foreign matter in the water vessel 13 can be collected in the blowing water tank 53.
- the steam containing foreign matter is returned to water and then collected in the blowing water tank 53, so that pollution and noise around the plant can be suppressed.
- the inertial filter 29 is connected to the position on the boiler 10 side of the bypass valve 28 in the bypass line 26. Therefore, a part of the foreign matter flowing through the bypass line 26 together with the steam can be recovered by the inertial filter 29 before reaching the bypass valve 28.
- the foreign matter that can be recovered by the inertial filter 29 is a foreign matter having a relatively large inertial force, in other words, a foreign matter having a relatively large mass. Therefore, in the present embodiment, it is possible to avoid blockage of the bypass valve 28 in the steam supply step (S23).
- the turbine protective plate 60 is provided in the condenser casing 13c, it is possible to suppress the inflow of steam containing foreign matter into the turbine casing 11c. Further, in the present embodiment, the side of the heat transfer tube group 13t into which the steam from the bypass line 26 and the bypass steam blow line 30 flows in is covered with the heat transfer tube protection net 61, so that a plurality of heat transfer tube groups 13t are formed. It is possible to prevent foreign matter from adhering to the heat transfer tube.
- the foreign matter detection step (S25) and the foreign matter amount determination step (S26) are executed during the execution of the pure water supply step (S22), the steam supply step (S23), and the blowing water recovery step (S24).
- the foreign matter detection step (S25) the amount of foreign matter contained in water or steam flowing through various lines is detected during the pure water supply step (S22), the steam supply step (S23), and the blowing water recovery step (S24). ..
- the target 62 is inserted into the target insertion portion 27 provided on the bypass line 26 for a predetermined time, and then the amount of foreign matter within a predetermined time is detected from the foreign matter collision trace remaining on the target 62.
- the water flowing through the blowing water line 54 is collected from the sampling nozzle 57 connected to the blowing water line 54, and the amount of foreign matter contained in the water is detected.
- the foreign matter amount determination step (S26) it is determined whether or not the foreign matter amount detected in the foreign matter detection step (S25) is less than a predetermined amount S.
- the predetermined amount S for the amount of foreign matter detected by using the target 62 and the predetermined amount S for the amount of foreign matter in the sampled water are different.
- the pure water pump 18, the condensate pump 21, and the water supply pump 22 are stopped, and the blowing-out step (blow-out step).
- the foreign matter amount determination step (S26) determines whether the foreign matter amount is not less than the predetermined amount S, in other words, the foreign matter amount is equal to or more than the predetermined amount S.
- the pure water supply step (S22), the steam supply step (S23), and the blowing water recovery step (S24) are continued until the amount becomes less than the specified amount S.
- 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 only by either one or both. When both are performed, blowing is performed when the amount of foreign matter detected by 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.
- the out process (S20) is completed.
- blowing-out post-processing step (S31) is executed.
- This blowing-out post-treatment step (S31) is a step of removing the temporary portion B from the permanent portion A. Specifically, in this blow-out post-treatment step (S31), the turbine protection plate 60 and the heat transfer tube protection net 61 in the condenser casing 13c are recovered from the condenser casing 13c. Further, the blowing water recovery device 52 and the temporary pure water line 50 are removed from the permanent portion A.
- the blind flange 41bf was connected to the first connecting seat 41s to which the blowing water line 54 of the blowing water recovery device 52 was connected, and the fourth connection to which the blowing water discharge line 58 of the blowing water recovery device 52 was connected.
- the blind flange 44bf is connected to the seat 44s.
- the blind flanges 42bf and 43bf are connected to the second connecting seat 42s and the third connecting seat 43s to which the temporary pure water line 50 is connected, respectively.
- blowing water recovery device 52 and the temporary pure water line 50 which are a part of the temporary portion B, are removed from the permanent portion A.
- the blowing water recovery device 52 and the temporary pure water line 50 may be permanently installed. In this case, the blowing water valve 56 and the temporary pure water control valve 51 are kept closed while the blowing out step (S20) is not being executed.
- the circulation line setting step (S32) is executed.
- the steam stop valve 24 is continuously closed and the bypass valve 28 is continuously opened. Further, the condensate outlet valve 33 and the water supply control valve 35 are opened.
- the circulation process (S33) is executed.
- the condensate pump 21 and the water supply pump 22 are driven.
- the water in the condenser 13 is supplied to the boiler 10 via the condenser line 32, the condenser pump 21, the water supply line 34, and the water supply pump 22.
- water is heated to steam.
- This steam flows into the condenser casing 13c via the main steam line 23 and the bypass line 26.
- the steam flowing into the condenser casing 13c is cooled by heat exchange with the cooling medium CM flowing in the plurality of heat transfer tubes in the condenser casing 13c to become water.
- This water collects in the hot well 13ch of the condenser casing 13c.
- the water collected in the hot well 13ch is supplied to the boiler 10 via the condensate pump 21, the water supply pump 22, and the like. That is, in this circulation step (S33), the condenser 13, the condenser line 32, the condenser pump 21, the water supply line 34, the water supply pump 22, the boiler 10, a part of the main steam line 23, the bypass line 26, and the bypass valve.
- Water (including liquid water and gas vapor) circulates in the circulation line composed of 28.
- the water quality detection step (S34) is executed.
- the water quality detector 36 connected to the water supply line 34 detects the water quality of the water flowing through the water supply line 34.
- the water supply blow step (S35) is executed.
- the water supply blow valve 38 provided in the water supply blow line 37 is opened.
- a part of the water flowing through the water supply line 34 flows into the wastewater treatment device 20 via the water supply blow line 37.
- the wastewater treatment device 20 purifies this water. Therefore, the amount of foreign matter contained in the water flowing through the water supply line 34 is reduced.
- the circulation step (S33) is also executed during this water supply blow step (S35).
- the pure water control valve 19 opens and the pure water pump 18 is driven.
- the water in the pure water tank 16 is replenished in the condenser casing 13c as condensate.
- the condensate pump 21 and the water supply pump 22 are continued to be driven, and steam from the boiler 10 is allowed to flow into the steam turbine 11 via the main steam line 23, and is usually used. You may shift to the operation of. Further, after the cleaning method is completed, the drive of the condensate pump 21 and the water supply pump 22 is stopped, and then, as described above, the condensate pump 21 and the water supply pump 22 are driven again to drive the steam turbine 11. You may start it.
- the circulation step (S33) is performed, and the foreign matter is also removed in this circulation step (S33). Therefore, only the blowing out is performed and the circulation step (S33) is performed.
- the amount of pure water used during the execution of the cleaning method of the present embodiment can be suppressed as compared with the case where the cleaning method is not performed.
- the degree of contamination of the steam to be supplied to the steam turbine 11 can be reduced to the degree of contamination that can be supplied to the steam turbine 11 before the operation of the steam turbine plant is started.
- the degree of contamination that can be supplied to the steam turbine 11 is a predetermined degree of contamination that can suppress damage to the steam turbine 11 even if steam is supplied to the steam turbine 11.
- the protective plate installation step (S13) and the protective net installation step (S14) are executed.
- the protective plate installation step (S13) and the protective net installation step (S14) may be omitted.
- the condenser 13 of the above embodiment is a water-cooled condenser, but may be an air-cooled condenser.
- steam flows through a plurality of heat transfer tubes in the condenser casing, and air from a fan or the like is sent to the plurality of heat transfer tubes to exchange heat with the air and steam.
- the turbine protection plate 60 is installed in the condenser casing, it is not possible to suppress the inflow of steam from the bypass line 26 into the steam turbine 11.
- 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 periphery of the heat transfer tube. Therefore, when the condenser 13 is an air-cooled condenser, the protective plate installation step (S13) and the protective net installation step (S14) are not executed.
- the condensate pump 21 and the water supply pump 22 are not stopped at the end of the blow-out step (S20).
- the circulation line setting step (S32) may be executed.
- the water collected in the blowing water tank 53 is sent to the wastewater treatment device 20.
- the clean water having a small amount of foreign matter may be drained to a river or the like.
- the steam turbine plant in the first aspect is A boiler 10 capable of generating steam, a steam turbine 11 driven by steam from the boiler 10, a water recovery device 13 capable of returning steam exhausted from the steam turbine 11 to water, and the water recovery device.
- a condensate pump 21 capable of boosting water from 13; a main steam line 23 for guiding steam generated in the boiler 10 to the steam turbine 11, and steam provided in the main steam line 23 to the steam turbine 11.
- a steam stop valve 24 capable of stopping the inflow of steam is branched from a position on the boiler 10 side of the steam stop valve 24 in the main steam line 23 and connected to the water recovery device 13.
- the bypass line 26, the bypass valve 28 provided in the bypass line 26, the condensate line 32 that can guide the steam in the reconstituter 13 to the condensate pump 21, and the confluence line 32 are provided. It is provided with a return water outlet valve 33, a water supply line 34 that can guide the steam boosted by the return water 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 that can guide the pure water in the pure water tank 16 to the water condensing device 13, and the pure water line 17. It has a pure water pump 18 provided and a pure water control valve 19 provided on the side of the water recovery device 13 with respect to the pure water pump 18 in the pure water line 17.
- the steam turbine plant further includes a first connecting portion 41 branched from the position of the condenser 13 with respect to the condenser outlet valve 33 in the condenser line 32, and the condenser line 32.
- the condensate is more than the pure water pump 18.
- It is provided with a third connection portion 43 that is branched from the position on the side of the condenser 13 and on the side of the pure water tank 16 with respect to the pure water control valve 19.
- the first connecting portion 41 has a first connecting seat 41s that can be connected to the first line.
- the second connecting portion 42 has a second connecting seat 42s that can be connected to the second line.
- the third connecting portion 43 has a third connecting seat 43s that can be connected to the second line.
- the condensate pump 21 when the blow-out is executed, the condensate pump 21 is driven with the steam stop valve 24, the bypass valve 28, and the condensate outlet valve 33 closed, and the condensate pump 21 is driven from the second connection portion 42. Pure water is supplied to the condensate pump 21. As a result, this pure water flows into the boiler 10 via the water supply line 34. The steam that has flowed into the boiler 10 flows into the condenser 13 via a part of the main steam line 23 and the bypass line 26. This steam returns to water in the condenser 13 and accumulates in the condenser 13.
- the water collected in the condenser 13 is discharged from the condenser line 32 and the first connection portion 41, and is collected in a container such as a tank.
- a container such as a tank.
- the pure water in the pure water tank 16 can be supplied to the condensate pump 21. can.
- the first connecting portion 41, the second connecting portion 42, and the third connecting portion 43 since each of the first connecting portion 41, the second connecting portion 42, and the third connecting portion 43 has the connecting seats 41s, 42s, 43s, these connecting portions 41, 42. A line can be easily connected to the 43.
- the steam turbine plant in the second aspect is In the steam turbine plant of the first aspect, the first connecting seat 41s, the second connecting seat 42s, and the third connecting seat 43s are all connecting flanges.
- the line can be flange-connected to each of the first connecting seat 41s, the second connecting seat 42s, and the third connecting seat 43s.
- the steam turbine plant in the third aspect is In the steam turbine plant of the first aspect or the second aspect, further, in the bypass line 26, in the steam installed on the boiler 10 side of the bypass valve 28 and flowing through the bypass line 26.
- the inertia filter 29 capable of removing the contained foreign matter is provided.
- the amount of foreign matter flowing into the bypass valve 28 can be reduced during the blowing out.
- the steam turbine plant in the fourth aspect is in any of the steam turbine plants according to the first aspect to the third aspect, the wastewater treatment device 20 capable of purifying the water from the water supply line 34 and the water supply line 34 branched from the water supply line 34 are further provided.
- the water supply blow line 37 that can guide the flowing water to the wastewater treatment device 20, the water supply blow valve 38 provided in the water supply blow line 37, and the water quality of the water that is connected to the water supply line 34 and flows through the water supply line 34.
- a water quality detector 36 that can detect the water quality detector 36 is provided.
- the steam turbine plant in the fifth aspect is The steam turbine plant according to any one of the first to fourth aspects is further provided with a blowing water recovery device 52.
- the blowing water recovery device 52 connects the blowing water tank 53 capable of temporarily storing the water from the condenser 13, the first connecting seat 41s, and the blowing water tank 53, and restores the water. It has a blowing water line 54 that can guide water from the condenser 13 to the blowing water tank 53, and a blowing water valve 56 provided in the blowing water line 54.
- the first line is the blowing water line 54.
- the water accumulated in the condenser 13 is transferred to the blowing water tank 53 via the condensate line 32, the first connection portion 41, and the blowing water line 54. Can be recovered.
- the steam turbine plant in the sixth aspect is The steam turbine plant of the fourth aspect is further provided with a blowing water recovery device 52.
- the blowing water recovery device 52 connects the blowing water tank 53 capable of temporarily storing the water from the water recovery device 13, the first connecting seat 41s, and the blowing water tank 53, and returns the water.
- the blowing water line 54 that can guide the water from the water device 13 to the blowing water tank 53, the blowing water valve 56 provided in the blowing water line 54, the blowing water tank 53, and the wastewater treatment device 20 are connected to each other. It also has a blowing water discharge line 58 that can guide the water in the blowing water tank 53 to the wastewater treatment device 20.
- the first line is the blowing water line 54.
- the water accumulated in the condenser 13 is transferred to the blowing water tank 53 via the condensate line 32, the first connection portion 41, and the blowing water line 54. Can be recovered. Further, in the steam turbine plant of this embodiment, the water accumulated in the blowing water tank 53 can be sent to the wastewater treatment device 20.
- the steam turbine plant in the seventh aspect is The steam turbine plant according to any one of the first aspect to the seventh aspect is further provided with a temporary pure water line 50.
- the temporary pure water line 50 can be connected to the second connecting seat 42s and the third connecting seat 43s as the second line.
- the pure water in the pure water tank 16 is condensate pump 21 by connecting the second connecting seat 42s and the third connecting seat 43s by the temporary pure water line 50 as the second line. Can be supplied to.
- the steam turbine plant in the eighth aspect is The steam turbine plant according to any one of the first aspect to the seventh aspect is further provided with a turbine protection plate 60.
- the condenser 13 is arranged in the condenser casing 13c into which steam from the steam turbine 11 and steam from the bypass line 26 can flow in, and is composed of a plurality of heat transfer tubes. It has a heat transfer tube group 13t and the like.
- the turbine protection plate 60 is provided in the condenser casing 13c on the steam turbine 11 side of the connection position between the condenser casing 13c and the bypass line 26, and steam from the bypass line 26. Can be suppressed from flowing into the steam turbine 11.
- the steam from the bypass line 26 flows into the steam turbine 11 during the blowing out by providing the turbine protective plate in the condenser casing before the blowing out. Can be suppressed.
- the steam turbine plant in the ninth aspect is The steam turbine plant according to any one of the first aspect to the seventh aspect is further provided with a heat transfer tube protection net 61.
- the condenser 13 is arranged in the condenser casing 13c into which steam from the steam turbine 11 and steam from the bypass line 26 can flow in, and is composed of a plurality of heat transfer tubes. It has a heat transfer tube group 13t and the like.
- the heat transfer tube protection net 61 can at least cover the side in which the steam from the bypass line 26 flows into the heat transfer tube group 13t.
- the method for cleaning a steam turbine plant according to the tenth aspect is applied to the following steam turbine plant.
- This steam turbine plant includes a boiler 10 capable of generating steam, a steam turbine 11 driven by steam from the boiler 10, and a water recovery device 13 capable of returning steam exhausted from the steam turbine 11 to water.
- a condensate pump 21 capable of boosting 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, and the steam provided in the main steam line 23.
- a steam stop valve 24 capable of stopping the inflow of steam into the turbine 11 and a water return device 13 branching from a position on the boiler 10 side of the steam stop valve 24 in the main steam line 23.
- a pure water supply device 15 capable of supplying pure water in the pure water tank 16 to the water recovery device 13 is provided. In this cleaning method, a preparation step (S10) and a blowing-out step (S20) are executed.
- water from the condenser 13 may be temporarily stored at a position on the condenser 13 side of the condenser outlet valve 33 in the condenser line 32.
- a temporary pure water line connecting step (S12) for connecting the temporary pure water line 50 so that the water in the pure water tank 16 can be sent to the position of.
- the blowing out step (S20) includes a blowing outline setting step (S21) for closing the steam stop valve 24 and the condensate outlet valve 33 and opening the bypass valve 28, the provisional pure water line 50, and the condensate pump.
- the pure water is heated in the boiler 10 to generate steam, and the steam generated in the boiler 10 is guided to the water condensing device 13 via the main steam line 23 and the bypass line 26 to restore the steam.
- the blowing water tank is a steam supply step (S23) in which the steam guided to the water device 13 is returned to water in the water recovery device 13 and water collected in the water recovery device 13 in the steam supply step (S23).
- the blowing water recovery step (S24) to be sent to 53 is included.
- the pure water in the pure water tank 16 is boiler 10 via the temporary pure water line 50, the condensate pump 21, and the water supply line 34.
- pure water is heated in the boiler 10 to generate steam, and this steam is transferred to the condenser 13 via the main steam line 23 and the bypass line 26.
- the steam guided to the condenser 13 is returned to water in the condenser 13.
- the blowing water recovery step (S24) in the blowing out step (S20) the water collected in the condenser 13 is sent to the blowing water tank 53.
- the steam containing foreign matter is returned to water and then collected in the blowing water tank 53, so that pollution and noise around the plant can be suppressed.
- the method for cleaning the steam turbine plant according to the eleventh aspect is as follows.
- the preparation step (S10) is performed in the water condensing device 13 on the side of the steam turbine 11 with respect to the position where the steam from the bypass line 26 flows in.
- the position includes a protection plate installation step (S13) in which a turbine protection plate 60 for suppressing the inflow of steam from the bypass line 26 into the steam turbine 11 is provided.
- the condenser 13 is a condenser casing 13c into which steam from the steam turbine 11 and steam from the bypass line 26 can flow in.
- a heat transfer tube composed of a plurality of heat transfer tubes arranged in the condenser casing 13c and capable of exchanging heat between the steam flowing into the condenser casing 13c and the cooling medium CM to condense the steam. It has a group of 13t and.
- the preparation step (S10) includes a protection net installation step (S14) in which at least the side where steam from the bypass line 26 flows into is covered with the heat transfer tube protection net 61 in the heat transfer tube group 13t.
- the method for cleaning the steam turbine plant in the thirteenth aspect is as follows.
- the blowing-out step (S20) is further included in the steam flowing into the condenser 13 from the bypass line 26.
- the foreign matter detection step (S25) for detecting the amount of foreign matter or the amount of foreign matter contained in the water flowing into the blowing water tank 53 from the condenser 13, and whether or not the amount of foreign matter is less than a predetermined amount. It includes a foreign matter amount determination step (S26) for determining whether or not.
- the blowing-out step (S20) is terminated on condition that the foreign matter amount determination step (S26) determines that the foreign matter amount is less than a predetermined amount.
- the blowing out step (S20) can be completed.
- the method for cleaning the steam turbine plant in the fourteenth aspect is as follows.
- a circulation line setting step (S32), a circulation step (S33), and a water quality detection step (S34) are performed.
- 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.
- the circulation step (S33) the water in the condenser 13 is supplied to the boiler 10 via the condenser line 32, the condenser outlet valve 33, the condenser pump 21, and the condenser line 34.
- the water is heated by the boiler 10 to generate steam, and the steam generated by the boiler 10 is guided to the condenser 13 via the main steam line 23 and the bypass line 26, and the condenser is used.
- the steam guided to 13 is returned to water in the condenser 13.
- the water quality detection step (S34) the water quality of the water from the condenser 13 is detected.
- the circulation step (S33) is executed in the condenser 13 via the condensate line 32, the condensate outlet valve 33, the condensate pump 21, and the water supply line 34.
- Water is supplied to the boiler 10.
- the water is heated by the boiler 10 to generate steam
- the steam is guided to the condenser 13 via the main steam line 23 and the bypass line 26, and the steam is returned to the water in the condenser 13.
- the water quality detection step (S34) is executed during the circulation step (S33) to detect the water quality of the water from the condenser 13. Therefore, in this embodiment, the steam from the boiler 10 is supplied to the steam turbine 11, and the degree of contamination of the steam to be supplied to the steam turbine 11 can be confirmed before starting the operation of the steam turbine plant. ..
- the method for cleaning the steam turbine plant in the fifteenth aspect is as follows.
- the water quality detected in the water quality detection step (S34) is equal to or higher than a predetermined degree of pollution
- the water flowing through the water supply line 34 is purified.
- a water supply blow step (S35) for blowing to a possible wastewater treatment device 20 is performed.
- the circulation step (S33) and the water supply blow step (S35) are terminated.
- the degree of contamination of the steam to be supplied to the steam turbine 11 can be reduced to the degree of contamination that can be supplied to the steam turbine 11 before the operation of the steam turbine plant is started.
- the degree of contamination that can be supplied to the steam turbine 11 is a predetermined degree of contamination that can suppress damage to the steam turbine 11 even if steam is supplied to the steam turbine 11.
- steam containing foreign matter can be returned to water during the blowing out, and then recovered in a container or the like, so that contamination and noise around the plant can be suppressed.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Turbines (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Engine Equipment That Uses Special Cycles (AREA)
- Cleaning By Liquid Or Steam (AREA)
- Cleaning In General (AREA)
Abstract
Description
本願は、2020年9月18日に、日本国に出願された特願2020-157199号に基づき優先権を主張し、この内容をここに援用する。
蒸気を発生可能なボイラと、前記ボイラからの蒸気で駆動可能な蒸気タービンと、前記蒸気タービンから排気された蒸気を水に戻すことができる復水器と、前記復水器からの水を昇圧可能な復水ポンプと、前記ボイラで発生した蒸気を前記蒸気タービンに導ける主蒸気ラインと、前記主蒸気ラインに設けられ、前記蒸気タービンへの蒸気の流入を止めることが可能な蒸気止め弁と、前記主蒸気ライン中で前記蒸気止め弁よりも前記ボイラの側の位置から分岐して、前記復水器に接続されているバイパスラインと、前記バイパスラインに設けられているバイパス弁と、前記復水器内の水を前記復水ポンプに導ける復水ラインと、前記復水ラインに設けられている復水出口弁と、前記復水ポンプで昇圧された水を前記ボイラに導ける給水ラインと、純水供給装置と、を備える。純水供給装置は、純水を蓄えることが可能な純水タンクと、前記純水タンク内の純水を前記復水器に導ける純水ラインと、前記純水ラインに設けられている純水ポンプと、前記純水ライン中で前記純水ポンプよりも前記復水器の側に設けられている純水調節弁と、を有する。この蒸気タービンプラントは、さらに、前記復水ライン中で、前記復水出口弁よりも前記復水器の側の位置から分岐している第一接続部と、前記復水ライン中で、前記復水出口弁よりも前記復水ポンプの側の位置からの分岐している第二接続部と、前記純水ライン中で、前記純水ポンプよりも前記復水器の側で且つ前記純水調節弁よりも前記純水タンクの側の位置から分岐している第三接続部と、を備える。前記第一接続部は、第一ラインと接続可能な第一接続座を有する。前記第二接続部は、第二ラインと接続可能な第二接続座を有する。前記第三接続部は、前記第二ラインと接続可能な第三接続座を有する。
この蒸気タービンプラントは、蒸気を発生可能なボイラと、前記ボイラからの蒸気で駆動可能な蒸気タービンと、前記蒸気タービンから排気された蒸気を水に戻すことできる復水器と、前記復水器からの水を昇圧可能な復水ポンプと、前記ボイラで発生した蒸気を前記蒸気タービンに導ける主蒸気ラインと、前記主蒸気ラインに設けられ、前記蒸気タービンへの蒸気の流入を止めることが可能な蒸気止め弁と、前記主蒸気ライン中で前記蒸気止め弁よりも前記ボイラの側の位置から分岐して、前記復水器に接続されているバイパスラインと、前記バイパスラインに設けられているバイパス弁と、前記復水器内の水を前記復水ポンプに導ける復水ラインと、前記復水ラインに設けられている復水出口弁と、前記復水ポンプで昇圧された水を前記ボイラに導ける給水ラインと、純水を蓄えることが可能な純水タンクを有し、前記純水タンク内の純水を前記復水器内に供給可能な純水供給装置と、を備える。
このクリーニング方法では、準備工程と、ブローイングアウト工程と、を実行する。前記準備工程は、前記復水ライン中で、前記復水出口弁よりも前記復水器の側の位置に、前記復水器からの水を一時的に蓄えることが可能なブローイング水タンクを有するブローイング水回収装置を接続するブローイング水回収装置設置工程と、前記復水ライン中で、前記復水出口弁よりも前記復水ポンプの側の位置に、前記純水タンク内の水を送れるよう、仮純水ラインを接続する仮純水ライン接続工程と、を含む。前記ブローイングアウト工程は、前記蒸気止め弁及び前記復水出口弁を閉じ、前記バイパス弁を開けるブローイングアウトライン設定工程と、前記仮純水ライン、前記復水ポンプ、及び前記給水ラインを介して、前記純水タンク内の純水を前記ボイラに供給する純水供給工程と、前記純水供給工程で前記ボイラに供給された純水を、前記ボイラ内で加熱して蒸気を発生させ、前記主蒸気ライン及び前記バイパスラインを介して、前記ボイラで発生した蒸気を復水器に導き、前記復水器に導かれた蒸気を前記復水器内で水に戻す蒸気供給工程と、前記蒸気供給工程で前記復水器内に溜まった水を前記ブローイング水タンクに送るブローイング水回収工程と、を含む。
本実施形態の蒸気タービンプラントについて、図1~図3を参照して説明する。本実施形態の蒸気タービンプラントは、常設部と仮設部とを備える。
本実施形態の蒸気タービンプラントのクリーニング方法について、図4に示すフローチャートに従って説明する。
この結果、給水ライン34を流れている水の一部が給水ブローライン37を介して、排水処理装置20に流入する。排水処理装置20は、この水を浄化処理する。よって、給水ライン34を流れる水中に含まれる異物が少なくなる。この給水ブロー工程(S35)中も、循環工程(S33)は実行される。この給水ブロー工程(S35)の実行で、復水器ケーシング13cのホットウェル13chに溜まっている復水の量が少なくなると、純水調節弁19が開くと共に、純水ポンプ18が駆動する。この結果、純水タンク16内の水が復水として復水器ケーシング13c内に補充される。
以上の実施形態では、保護板設置工程(S13)及び保護ネット設置工程(S14)を実行する。しかしながら、保護板設置工程(S13)及び保護ネット設置工程(S14)を省略してもよい。
このため、復水器ケーシング内にタービン保護板60を設置しても、蒸気タービン11内にバイパスライン26からの蒸気が流入することを抑制できない。また、伝熱管群を伝熱管保護ネット61で覆っても、伝熱管の外周に異物が付着することを抑制できない。よって、復水器13が空冷式復水器である場合には、保護板設置工程(S13)及び保護ネット設置工程(S14)を実行しない。
以上の実施形態における蒸気タービンプラントは、例えば、以下のように把握される。
蒸気を発生可能なボイラ10と、前記ボイラ10からの蒸気で駆動可能な蒸気タービン11と、前記蒸気タービン11から排気された蒸気を水に戻すことができる復水器13と、前記復水器13からの水を昇圧可能な復水ポンプ21と、前記ボイラ10で発生した蒸気を前記蒸気タービン11に導ける主蒸気ライン23と、前記主蒸気ライン23に設けられ、前記蒸気タービン11への蒸気の流入を止めることが可能な蒸気止め弁24と、前記主蒸気ライン23中で前記蒸気止め弁24よりも前記ボイラ10の側の位置から分岐して、前記復水器13に接続されているバイパスライン26と、前記バイパスライン26に設けられているバイパス弁28と、前記復水器13内の水を前記復水ポンプ21に導ける復水ライン32と、前記復水ライン32に設けられている復水出口弁33と、前記復水ポンプ21で昇圧された水を前記ボイラ10に導ける給水ライン34と、純水供給装置15と、を備える。純水供給装置15は、純水を蓄えることが可能な純水タンク16と、前記純水タンク16内の純水を前記復水器13に導ける純水ライン17と、前記純水ライン17に設けられている純水ポンプ18と、前記純水ライン17中で前記純水ポンプ18よりも前記復水器13の側に設けられている純水調節弁19と、を有する。この蒸気タービンプラントは、さらに、前記復水ライン32中で、前記復水出口弁33よりも前記復水器13の側の位置から分岐している第一接続部41と、前記復水ライン32中で、前記復水出口弁33よりも前記復水ポンプ21の側の位置からの分岐している第二接続部42と、前記純水ライン17中で、前記純水ポンプ18よりも前記復水器13の側で且つ前記純水調節弁19よりも前記純水タンク16の側の位置から分岐している第三接続部43と、を備える。前記第一接続部41は、第一ラインと接続可能な第一接続座41sを有する。前記第二接続部42は、第二ラインと接続可能な第二接続座42sを有する。前記第三接続部43は、前記第二ラインと接続可能な第三接続座43sを有する。
前記第一態様の蒸気タービンプラントにおいて、前記第一接続座41s、前記第二接続座42s及び前記第三接続座43sは、いずれも、接続フランジである。
前記第一態様又は前記第二態様の蒸気タービンプラントにおいて、さらに、前記バイパスライン26中で、前記バイパス弁28よりも前記ボイラ10の側に設置され、前記バイパスライン26を流れてきた蒸気中に含まれる異物を除去可能な慣性フィルタ29を備える。
前記第一態様から前記第三態様のいずれかの蒸気タービンプラントにおいて、さらに、前記給水ライン34からの水を浄化可能な排水処理装置20と、前記給水ライン34から分岐し、前記給水ライン34を流れる水を前記排水処理装置20に導ける給水ブローライン37と、前記給水ブローライン37に設けられている給水ブロー弁38と、前記給水ライン34に接続され、前記給水ライン34を流れる水の水質を検知できる水質検知器36と、を備える。
前記第一態様から前記第四態様のいずれかの蒸気タービンプラントにおいて、さらに、ブローイング水回収装置52を備える。前記ブローイング水回収装置52は、前記復水器13からの水を一時的に蓄えることが可能なブローイング水タンク53と、前記第一接続座41sと前記ブローイング水タンク53とを接続し、前記復水器13からの水を前記ブローイング水タンク53に導けるブローイング水ライン54と、前記ブローイング水ライン54に設けられているブローイング水弁56と、を有する。前記第一ラインは、前記ブローイング水ライン54である。
前記第四態様の蒸気タービンプラントにおいて、さらに、ブローイング水回収装置52を備える。前記ブローイング水回収装置52は、前記復水器13からの水を一時的に蓄えることが可能なブローイング水タンク53と、前記第一接続座41sと前記ブローイング水タンク53とを接続し、前記復水器13からの水を前記ブローイング水タンク53に導けるブローイング水ライン54と、前記ブローイング水ライン54に設けられているブローイング水弁56と、前記ブローイング水タンク53と前記排水処理装置20とを接続し、前記ブローイング水タンク53内の水を前記排水処理装置20に導けるブローイング水排出ライン58と、を有する。前記第一ラインは、前記ブローイング水ライン54である。
前記第一態様から前記第七態様のいずれかの蒸気タービンプラントにおいて、さらに、仮純水ライン50を備える。前記仮純水ライン50は、前記第二ラインとして、前記第二接続座42s及び前記第三接続座43sに接続可能である。
前記第一態様から前記第七態様のいずれかの蒸気タービンプラントにおいて、さらに、タービン保護板60を備える。前記復水器13は、前記蒸気タービン11からの蒸気及び前記バイパスライン26からの蒸気が流入可能な復水器ケーシング13cと、前記復水器ケーシング13c内に配置され、複数の伝熱管で構成される伝熱管群13tと、を有する。前記タービン保護板60は、前記復水器ケーシング13c内で、前記復水器ケーシング13cと前記バイパスライン26との接続位置よりも前記蒸気タービン11の側に設けられ、前記バイパスライン26からの蒸気が前記蒸気タービン11に流入するのを抑制可能である。
前記第一態様から前記第七態様のいずれかの蒸気タービンプラントにおいて、さらに、伝熱管保護ネット61を備える。前記復水器13は、前記蒸気タービン11からの蒸気及び前記バイパスライン26からの蒸気が流入可能な復水器ケーシング13cと、前記復水器ケーシング13c内に配置され、複数の伝熱管で構成される伝熱管群13tと、を有する。前記伝熱管保護ネット61は、前記伝熱管群13t中で、前記バイパスライン26からの蒸気が流入する側を少なくとも覆うことが可能である。
この蒸気タービンプラントは、蒸気を発生可能なボイラ10と、前記ボイラ10からの蒸気で駆動可能な蒸気タービン11と、前記蒸気タービン11から排気された蒸気を水に戻すことできる復水器13と、前記復水器13からの水を昇圧可能な復水ポンプ21と、前記ボイラ10で発生した蒸気を前記蒸気タービン11に導ける主蒸気ライン23と、前記主蒸気ライン23に設けられ、前記蒸気タービン11への蒸気の流入を止めることが可能な蒸気止め弁24と、前記主蒸気ライン23中で前記蒸気止め弁24よりも前記ボイラ10の側の位置から分岐して、前記復水器13に接続されているバイパスライン26と、前記バイパスライン26に設けられているバイパス弁28と、前記復水器13内の水を前記復水ポンプ21に導ける復水ライン32と、前記復水ライン32に設けられている復水出口弁33と、前記復水ポンプ21で昇圧された水を前記ボイラ10に導ける給水ライン34と、純水を蓄えることが可能な純水タンク16を有し、前記純水タンク16内の純水を前記復水器13内に供給可能な純水供給装置15と、を備える。
このクリーニング方法では、準備工程(S10)と、ブローイングアウト工程(S20)と、を実行する。前記準備工程(S10)は、前記復水ライン32中で、前記復水出口弁33よりも前記復水器13の側の位置に、前記復水器13からの水を一時的に蓄えることが可能なブローイング水タンク53を有するブローイング水回収装置52を接続するブローイング水回収装置設置工程(S11)と、前記復水ライン32中で、前記復水出口弁33よりも前記復水ポンプ21の側の位置に、前記純水タンク16内の水を送れるよう、仮純水ライン50を接続する仮純水ライン接続工程(S12)と、を含む。前記ブローイングアウト工程(S20)は、前記蒸気止め弁24及び前記復水出口弁33を閉じ、前記バイパス弁28を開けるブローイングアウトライン設定工程(S21)と、前記仮純水ライン50、前記復水ポンプ21、及び前記給水ライン34を介して、前記純水タンク16内の純水を前記ボイラ10に供給する純水供給工程(S22)と、前記純水供給工程(S22)で前記ボイラ10に供給された純水を、前記ボイラ10内で加熱して蒸気を発生させ、前記主蒸気ライン23及び前記バイパスライン26を介して、前記ボイラ10で発生した蒸気を復水器13に導き、前記復水器13に導かれた蒸気を前記復水器13内で水に戻す蒸気供給工程(S23)と、前記蒸気供給工程(S23)で前記復水器13内に溜まった水を前記ブローイング水タンク53に送るブローイング水回収工程(S24)と、を含む。
このように、本態様では、異物を含む蒸気を水に戻してから、これをブローイング水タンク53に回収するので、プラント周りの汚染及び騒音を抑えることができる。
前記第十態様の蒸気タービンプラントのクリーニング方法において、前記準備工程(S10)は、前記復水器13内で、前記バイパスライン26からの蒸気が流入する位置よりも、前記蒸気タービン11の側の位置に、前記バイパスライン26からの蒸気が前記蒸気タービン11に流入するのを抑制するタービン保護板60を設ける保護板設置工程(S13)を含む。
前記第十態様又は前記第十一態様の蒸気タービンプラントのクリーニング方法において、前記復水器13は、前記蒸気タービン11からの蒸気及び前記バイパスライン26からの蒸気が流入可能な復水器ケーシング13cと、前記復水器ケーシング13c内に配置され、前記復水器ケーシング13c内に流入した蒸気と冷却媒体CMとを熱交換させて、蒸気を凝縮可能な複数の伝熱管で構成される伝熱管群13tと、を有する。前記準備工程(S10)は、前記伝熱管群13t中で、少なくとも前記バイパスライン26からの蒸気が流入する側を伝熱管保護ネット61で覆う保護ネット設置工程(S14)を含む。
前記第十態様から前記第十二態様のいずれかの蒸気タービンプラントのクリーニング方法において、前記ブローイングアウト工程(S20)は、さらに、前記バイパスライン26から前記復水器13に流入する蒸気中に含まれる異物量、又は前記復水器13から前記ブローイング水タンク53に流入する水中に含まれる異物量を検知する異物検知工程(S25)と、前記異物量が予め定められた量未満であるか否かを判断する異物量判断工程(S26)と、を含む。前記異物量判断工程(S26)で、前記異物量が予め定められた量未満であると判断さることを条件として、前記ブローイングアウト工程(S20)を終了する。
前記第十三態様の蒸気タービンプラントのクリーニング方法において、さらに、前記ブローイングアウト工程(S20)後に、循環ライン設定工程(S32)と、循環工程(S33)と、水質検知工程(S34)と、を実行する。前記循環ライン設定工程(S32)では、前記蒸気止め弁24を閉じ、前記バイパス弁28及び前記復水出口弁33を開ける。前記循環工程(S33)では、前記復水ライン32、前記復水出口弁33、前記復水ポンプ21及び前記給水ライン34を介して、前記復水器13内の水を前記ボイラ10に供給して、前記ボイラ10で前記水を加熱して蒸気を発生させ、前記主蒸気ライン23及び前記バイパスライン26を介して、前記ボイラ10で発生した蒸気を復水器13に導き、前記復水器13に導かれた蒸気を前記復水器13内で水に戻す。前記水質検知工程(S34)では、前記復水器13からの水の水質を検知する。
前記第十四態様の蒸気タービンプラントのクリーニング方法において、さらに、前記水質検知工程(S34)で検知された水質が予め定められた汚染度以上である場合に、前記給水ライン34を流れる水を浄化可能な排水処理装置20にブローする給水ブロー工程(S35)を実行する。前記循環工程(S33)中に、前記水質検知工程(S34)で検知された水質が予め定められた汚染度未満になると、前記循環工程(S33)及び前記給水ブロー工程(S35)を終了する。
10:ボイラ
11:蒸気タービン
11r:タービンロータ
11c:タービンケーシング
12:発電機
13:復水器
13c:復水器ケーシング
13ci:蒸気流入開口
13ch:ホットウェル
13t:伝熱管群
15:純水供給装置
16:純水タンク
17:純水ライン
18:純水ポンプ
19:純水調節弁
20:排水処理装置
21:復水ポンプ
22:給水ポンプ
23:主蒸気ライン
24:蒸気止め弁
25:蒸気加減弁
26:バイパスライン
26u:上流側直管部
26c:折れ曲がり部
26d:下流側直管部
27:ターゲット挿入部
28:バイパス弁
29:慣性フィルタ
29p:直管
29bf:盲フランジ
30:バイパス蒸気ブローライン
31:バイパス蒸気ブロー弁
32:復水ライン
33:復水出口弁
34:給水ライン
35:給水調節弁
36:水質検知器
37:給水ブローライン
38:給水ブロー弁
41:第一接続部
41p:第一分岐管
41s:第一接続座
41bf:盲フランジ
42:第二接続部
42p:第二分岐管
42s:第二接続座
42bf:盲フランジ
43:第三接続部
43p:第三分岐管
43s:第三接続座
43bf:盲フランジ
44:第四接続部
44p:連通管
44s:第四接続座
44bf:盲フランジ
B:仮設部
50:仮純水ライン
51:仮純水調節弁
52:ブローイング水回収装置
53:ブローイング水タンク
54:ブローイング水ライン
55:ブローイング水ポンプ
56:ブローイング水弁
57:サンプリングノズル
58:ブローイング水排出ライン
59:ブローイング水排出ポンプ
60:タービン保護板
61:伝熱管保護ネット
62:ターゲット
Claims (15)
- 蒸気を発生可能なボイラと、
前記ボイラからの蒸気で駆動可能な蒸気タービンと、
前記蒸気タービンから排気された蒸気を水に戻すことができる復水器と、
前記復水器からの水を昇圧可能な復水ポンプと、
前記ボイラで発生した蒸気を前記蒸気タービンに導ける主蒸気ラインと、
前記主蒸気ラインに設けられ、前記蒸気タービンへの蒸気の流入を止めることが可能な蒸気止め弁と、
前記主蒸気ライン中で前記蒸気止め弁よりも前記ボイラの側の位置から分岐して、前記復水器に接続されているバイパスラインと、
前記バイパスラインに設けられているバイパス弁と、
前記復水器内の水を前記復水ポンプに導ける復水ラインと、
前記復水ラインに設けられている復水出口弁と、
前記復水ポンプで昇圧された水を前記ボイラに導ける給水ラインと、
純水を蓄えることが可能な純水タンクと、前記純水タンク内の純水を前記復水器に導ける純水ラインと、前記純水ラインに設けられている純水ポンプと、前記純水ライン中で前記純水ポンプよりも前記復水器の側に設けられている純水調節弁と、を有する純水供給装置と、
前記復水ライン中で、前記復水出口弁よりも前記復水器の側の位置から分岐している第一接続部と、
前記復水ライン中で、前記復水出口弁よりも前記復水ポンプの側の位置からの分岐している第二接続部と、
前記純水ライン中で、前記純水ポンプよりも前記復水器の側で且つ前記純水調節弁よりも前記純水タンクの側の位置から分岐している第三接続部と、
を備え、
前記第一接続部は、第一ラインと接続可能な第一接続座を有し、
前記第二接続部は、第二ラインと接続可能な第二接続座を有し、
前記第三接続部は、前記第二ラインと接続可能な第三接続座を有する、
蒸気タービンプラント。 - 請求項1に記載の蒸気タービンプラントにおいて、
前記第一接続座、前記第二接続座及び前記第三接続座は、いずれも、接続フランジである、
蒸気タービンプラント。 - 請求項1又は2に記載の蒸気タービンプラントにおいて、
さらに、前記バイパスライン中で、前記バイパス弁よりも前記ボイラの側に設置され、前記バイパスラインを流れてきた蒸気中に含まれる異物を除去可能な慣性フィルタを備える、
蒸気タービンプラント。 - 請求項1から3のいずれか一項に記載の蒸気タービンプラントにおいて、
さらに、前記給水ラインからの水を浄化可能な排水処理装置と、
前記給水ラインから分岐し、前記給水ラインを流れる水を前記排水処理装置に導ける給水ブローラインと、
前記給水ブローラインに設けられている給水ブロー弁と、
前記給水ラインに接続され、前記給水ラインを流れる水の水質を検知できる水質検知器と、
を備える、
蒸気タービンプラント。 - 請求項1から4のいずれか一項に記載の蒸気タービンプラントにおいて、
さらに、ブローイング水回収装置を備え、
前記ブローイング水回収装置は、
前記復水器からの水を一時的に蓄えることが可能なブローイング水タンクと、
前記第一接続座と前記ブローイング水タンクとを接続し、前記復水器からの水を前記ブローイング水タンクに導けるブローイング水ラインと、
前記ブローイング水ラインに設けられているブローイング水弁と、
を有し、
前記第一ラインは、前記ブローイング水ラインである、
蒸気タービンプラント。 - 請求項4に記載の蒸気タービンプラントにおいて、
さらに、ブローイング水回収装置を備え、
前記ブローイング水回収装置は、
前記復水器からの水を一時的に蓄えることが可能なブローイング水タンクと、
前記第一接続座と前記ブローイング水タンクとを接続し、前記復水器からの水を前記ブローイング水タンクに導けるブローイング水ラインと、
前記ブローイング水ラインに設けられているブローイング水弁と、
前記ブローイング水タンクと前記排水処理装置とを接続し、前記ブローイング水タンク内の水を前記排水処理装置に導けるブローイング水排出ラインと、
を有し、
前記第一ラインは、前記ブローイング水ラインである、
蒸気タービンプラント。 - 請求項1から6のいずれか一項に記載の蒸気タービンプラントにおいて、
さらに、仮純水ラインを備え、
前記仮純水ラインは、前記第二ラインとして、前記第二接続座及び前記第三接続座に接続可能である、
蒸気タービンプラント。 - 請求項1から7のいずれか一項に記載の蒸気タービンプラントにおいて、
さらに、タービン保護板を備え、
前記復水器は、前記蒸気タービンからの蒸気及び前記バイパスラインからの蒸気が流入可能な復水器ケーシングと、前記復水器ケーシング内に配置され、複数の伝熱管で構成される伝熱管群と、を有し、
前記タービン保護板は、前記復水器ケーシング内で、前記復水器ケーシングと前記バイパスラインとの接続位置よりも前記蒸気タービンの側に設けられ、前記バイパスラインからの蒸気が前記蒸気タービンに流入するのを抑制可能である、
蒸気タービンプラント。 - 請求項1から7のいずれか一項に記載の蒸気タービンプラントにおいて、
さらに、伝熱管保護ネットを備え、
前記復水器は、前記蒸気タービンからの蒸気及び前記バイパスラインからの蒸気が流入可能な復水器ケーシングと、前記復水器ケーシング内に配置され、複数の伝熱管で構成される伝熱管群と、を有し、
前記伝熱管保護ネットは、前記伝熱管群中で、前記バイパスラインからの蒸気が流入する側を少なくとも覆うことが可能である、
蒸気タービンプラント。 - 蒸気を発生可能なボイラと、
前記ボイラからの蒸気で駆動可能な蒸気タービンと、
前記蒸気タービンから排気された蒸気を水に戻すことできる復水器と、
前記復水器からの水を昇圧可能な復水ポンプと、
前記ボイラで発生した蒸気を前記蒸気タービンに導ける主蒸気ラインと、
前記主蒸気ラインに設けられ、前記蒸気タービンへの蒸気の流入を止めることが可能な蒸気止め弁と、
前記主蒸気ライン中で前記蒸気止め弁よりも前記ボイラの側の位置から分岐して、前記復水器に接続されているバイパスラインと、
前記バイパスラインに設けられているバイパス弁と、
前記復水器内の水を前記復水ポンプに導ける復水ラインと、
前記復水ラインに設けられている復水出口弁と、
前記復水ポンプで昇圧された水を前記ボイラに導ける給水ラインと、
純水を蓄えることが可能な純水タンクを有し、前記純水タンク内の純水を前記復水器内に供給可能な純水供給装置と、
を備える蒸気タービンプラントのクリーニング方法において、
準備工程と、ブローイングアウト工程と、を実行し、
前記準備工程は、
前記復水ライン中で、前記復水出口弁よりも前記復水器の側の位置に、前記復水器からの水を一時的に蓄えることが可能なブローイング水タンクを有するブローイング水回収装置を接続するブローイング水回収装置設置工程と、
前記復水ライン中で、前記復水出口弁よりも前記復水ポンプの側の位置に、前記純水タンク内の水を送れるよう、仮純水ラインを接続する仮純水ライン接続工程と、
を含み、
前記ブローイングアウト工程は、
前記蒸気止め弁及び前記復水出口弁を閉じ、前記バイパス弁を開けるブローイングアウトライン設定工程と、
前記仮純水ライン、前記復水ポンプ、及び前記給水ラインを介して、前記純水タンク内の純水を前記ボイラに供給する純水供給工程と、
前記純水供給工程で前記ボイラに供給された純水を、前記ボイラ内で加熱して蒸気を発生させ、前記主蒸気ライン及び前記バイパスラインを介して、前記ボイラで発生した蒸気を復水器に導き、前記復水器に導かれた蒸気を前記復水器内で水に戻す蒸気供給工程と、
前記蒸気供給工程で前記復水器内に溜まった水を前記ブローイング水タンクに送るブローイング水回収工程と、
を含む、
蒸気タービンプラントのクリーニング方法。 - 請求項10に記載の蒸気タービンプラントのクリーニング方法において、
前記準備工程は、前記復水器内で、前記バイパスラインからの蒸気が流入する位置よりも、前記蒸気タービンの側の位置に、前記バイパスラインからの蒸気が前記蒸気タービンに流入するのを抑制するタービン保護板を設ける保護板設置工程を含む、
蒸気タービンプラントのクリーニング方法。 - 請求項10又は11に記載の蒸気タービンプラントのクリーニング方法において、
前記復水器は、前記蒸気タービンからの蒸気及び前記バイパスラインからの蒸気が流入可能な復水器ケーシングと、前記復水器ケーシング内に配置され、前記復水器ケーシング内に流入した蒸気と冷却媒体とを熱交換させて、蒸気を凝縮可能な複数の伝熱管で構成される伝熱管群と、を有し、
前記準備工程は、前記伝熱管群中で、少なくとも前記バイパスラインからの蒸気が流入する側を伝熱管保護ネットで覆う保護ネット設置工程を含む、
蒸気タービンプラントのクリーニング方法。 - 請求項10から12のいずれか一項に記載の蒸気タービンプラントのクリーニング方法において、
前記ブローイングアウト工程は、さらに、
前記バイパスラインから前記復水器に流入する蒸気中に含まれる異物量、又は前記復水器から前記ブローイング水タンクに流入する水中に含まれる異物量を検知する異物検知工程と、
前記異物量が予め定められた量未満であるか否かを判断する異物量判断工程と、
を含み、
前記異物量判断工程で、前記異物量が予め定められた量未満であると判断さることを条件として、前記ブローイングアウト工程を終了する、
蒸気タービンプラントのクリーニング方法。 - 請求項13に記載の蒸気タービンプラントのクリーニング方法において、
さらに、前記ブローイングアウト工程後に、循環ライン設定工程と、循環工程と、水質検知工程と、を実行し、
前記循環ライン設定工程では、前記蒸気止め弁を閉じ、前記バイパス弁及び前記復水出口弁を開け、
前記循環工程では、前記復水ライン、前記復水出口弁、前記復水ポンプ及び前記給水ラインを介して、前記復水器内の水を前記ボイラに供給して、前記ボイラで前記水を加熱して蒸気を発生させ、前記主蒸気ライン及び前記バイパスラインを介して、前記ボイラで発生した蒸気を復水器に導き、前記復水器に導かれた蒸気を前記復水器内で水に戻し、
前記水質検知工程では、前記復水器からの水の水質を検知する、
蒸気タービンプラントのクリーニング方法。 - 請求項14に記載の蒸気タービンプラントのクリーニング方法において、
さらに、前記水質検知工程で検知された水質が予め定められた汚染度以上である場合に、前記給水ラインを流れる水を浄化可能な排水処理装置にブローする給水ブロー工程を実行し、
前記循環工程中に、前記水質検知工程で検知された水質が予め定められた汚染度未満になると、前記循環工程及び前記給水ブロー工程を終了する、
蒸気タービンプラントのクリーニング方法。
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