Condenser system, steam power plant, and method for operating condenser system

Abstract

To provide a condenser system capable of suppressing waste of makeup water and reducing the amount of makeup water, and an operation method thereof.SOLUTION: The condenser system 100A includes the condenser 112 that cools and condenses the vapor exhausted from the vapor turbine, the vacuum pumps 51 that extract the gas in the condenser 112, the storage tank 52 that separates and stores the moisture in the gas extracted by the vacuum pumps 51 and fed from the vacuum pumps 51, and the overflow water return line L8 that returns the overflow water from the storage tank 52 to the condenser 112 side.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a condenser system, a steam power plant, and a method of operating a condenser system. [Background technology]

[0002] Steam power plants, such as thermal power plants, generate electricity by driving steam turbines with steam generated in steam generators such as boilers. After driving the steam turbine, the steam is cooled and condensed in a condenser to return it to its liquid state, and then supplied to the steam generator again for reuse.

[0003] To ensure a high degree of vacuum within the condenser, a vacuum pump is provided to discharge non-condensable gases (air, etc.) from the condenser to the outside of the system. A water-sealed rotary vacuum pump is used as the vacuum pump (Patent Documents 1 and 2). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 10-299418 [Patent Document 2] Japanese Patent Application Publication No. 1-178708 Summary of the Invention [Problem to be solved by the invention]

[0005] Here, a condenser system 500 as a reference example will be described with reference to Fig. 4. As shown in Fig. 4, a water supply line L51 provided with a condensate pump (CP) 521 is connected to the condenser 512, and the condensate produced by cooling in the condenser 512 is sent again to a coal economizer (not shown) via the water supply line L51.

[0006] The condenser 512 is also connected to an open-to-atmosphere tank 554 via a condenser line L59. The open-to-atmosphere tank 554 is capable of storing water supplied from a drain water line (not shown) or the like. The condenser line L59 is provided with a differential pressure adjustment valve (water level control valve) 555 for the open-to-atmosphere tank 554, which maintains a differential pressure between the condenser 512 side and the open-to-atmosphere tank 554 side and adjusts the water level.

[0007] A vacuum pump 551 is connected to the condenser 512 in order to create a vacuum inside the condenser 512. Specifically, one end of a non-condensable gas extraction line (gas extraction line) L57 is connected to the condenser 512, and the gas extraction line L57 is provided with the vacuum pump 551. The other end of the gas extraction line L57 is connected to a storage tank 552, and is configured so that the non-condensable gas (hereinafter also simply referred to as "gas") extracted from the condenser 512 by the vacuum pump 551 is supplied.

[0008] The storage tank 552 is connected to a pit (not shown) so that moisture separated from the gas can be drained. However, since the internal pressure of the storage tank 552 is higher than atmospheric pressure by the amount of pressure loss ΔP1 ((atmospheric pressure + ΔP1) MPa(a)), a U-seal 553 is provided to seal the storage tank 552. Moisture is separated from the gas supplied from the vacuum pump 551 in the storage tank 552, and the gas from which moisture has been separated is released into the atmosphere. Meanwhile, the moisture separated from the gas is discharged outside the system via a nearby pit. This has led to the problem of wasting makeup water.

[0009] The present disclosure has been made in consideration of the above circumstances, and aims to provide a condenser system, a steam power plant, and a method for operating a condenser system that can suppress waste of makeup water and reduce the amount of makeup water. [Means for solving the problem]

[0010] In order to solve the above problems, the condenser system of the present disclosure includes a condenser that cools and condenses steam exhausted from a steam turbine, a vacuum pump that extracts gas within the condenser, a storage tank that separates and stores moisture in the gas extracted by the vacuum pump and delivered from the vacuum pump, and an overflow water return line that returns overflow water from the storage tank to the condenser side.

[0011] A method for operating a condenser system according to the present disclosure includes a condenser that cools and condenses steam exhausted from a steam turbine, a vacuum pump that extracts gas from the condenser, and a storage tank that separates and stores moisture contained in the gas extracted by the vacuum pump and delivered from the vacuum pump, and includes a step of returning overflow water from the storage tank to the condenser side. [Effects of the Invention]

[0012] The condenser system and the method of operating the condenser system disclosed herein can return overflow water from the storage tank to the condenser side without discharging it outside the system, which allows the overflow water to be reused within the system, thereby suppressing waste of makeup water and reducing the amount of makeup water. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a schematic diagram showing a steam, condensate, and feedwater system in a steam power plant according to a first embodiment of the present disclosure. FIG. [Figure 2] 1 is a schematic configuration diagram showing a condenser system according to a first embodiment of the present disclosure. [Figure 3] FIG. 4 is a schematic configuration diagram showing a condenser system according to a second embodiment of the present disclosure. [Figure 4] FIG. 1 is a schematic configuration diagram showing an example of a condenser system as a reference example. DETAILED DESCRIPTION OF THE INVENTION

[0014] An embodiment of the present disclosure will be described below with reference to the drawings. Note that the present disclosure is not limited to this embodiment, and when there are multiple embodiments, it also includes configurations that combine the embodiments. In the following description, "up" and "upper" refer to the upper side in the vertical direction, and "lower" and "lower" refer to the lower side in the vertical direction, and the vertical direction is not precise and may include errors.

[0015] [First embodiment] FIG. 1 is a schematic diagram showing the configuration of a steam power plant equipped with a boiler (a once-through boiler) as a steam generator of this embodiment.

[0016] As shown in FIG. 1 , the steam power plant 1 of this embodiment includes heat exchangers (evaporator 101, superheaters 102A, 102B, 102C, reheaters 103A, 103B, and economizer 104) provided in a boiler 10, a steam turbine 111 that is rotationally driven by steam generated by heat exchange with combustion gas or the like in the boiler 10, and a generator 113 that is connected to the steam turbine 111 and generates electricity by the rotational force of the steam turbine 111. Note that, hereinafter, the superheaters 102A, 102B, and 102C may be collectively referred to as "superheater 102." Also, hereinafter, the reheaters 103A and 103B may be collectively referred to as "reheater 103."

[0017] The steam turbine 111 is composed of, for example, a high-pressure turbine 111A, an intermediate-pressure turbine 111B, and a low-pressure turbine 111C. Steam heated by a superheater 102 of the boiler 10 drives the high-pressure turbine 111A, is reheated by a reheater 103 of the boiler 10, and drives the intermediate-pressure turbine 111B and the low-pressure turbine 111C. A condenser 112 is connected to the low-pressure turbine 111C, and the steam that drives the low-pressure turbine 111C is condensed into condensate by heat exchange with cooling water (e.g., seawater or river water) in the condenser 112. The condenser 112 is connected to the economizer 104 via a feedwater line L1. The feedwater line L1 is provided with, for example, a condensate pump (CP) 121, a low-pressure feedwater heater 122, a boiler feedwater pump (BFP) 123, and a high-pressure feedwater heater 124. A portion of the steam that drives the steam turbine 111 is extracted and supplied to the low-pressure feedwater heater 122 and the high-pressure feedwater heater 124 as a heat source via an extraction line (not shown), and the low-pressure feedwater heater 122 and the high-pressure feedwater heater 124 heat the feedwater that is supplied to the economizer 104. The condenser 112 is one of the components of the condenser system 100A according to this embodiment.

[0018] For example, a case will be described in which the boiler 10 is a once-through boiler. The economizer 104 is connected to the heat transfer tubes that make up the evaporator 101. The feedwater heated by the economizer 104 is heated by radiation from the flame in the furnace as it passes through the heat transfer tubes that make up the evaporator 101, and is then led to the steam separator 125. The steam separated in the steam separator 125 is supplied to the superheater 102, and the drain water separated in the steam separator 125 flows into the steam separator drain tank 126 and is led to the condenser 112 via the drain water line L2.

[0019] Furthermore, during startup or low-load operation of the once-through boiler, the feedwater supplied from the economizer 104 may not all evaporate as it passes through the heat transfer tubes that make up the evaporator 101, resulting in an operating state (wet operating state) in which a water level exists in the steam separator 125. In this wet operating state, the drain water separated in the steam separator 125 and discharged to the steam separator drain tank 126 may be circulated and supplied from the economizer 104 to the heat transfer tubes that make up the evaporator 101 by using a boiler circulation pump (BCP) 127 to join the water supply line L1 via a circulation line L6.

[0020] Feedwater supplied from a boiler feed pump (BFP) 123 is preheated in a coal economizer 104, and then heated to become steam as it passes through the heat transfer tubes that make up the evaporator 101. The steam separated in the steam separator 125 is introduced into the first superheater 102A, the second superheater 102B, and the third superheater 102C and superheated. The superheated steam generated in the superheater 102A is supplied to the high-pressure turbine 111A via a steam line L3 and drives the high-pressure turbine 111A to rotate. The steam discharged from the high-pressure turbine 111A is introduced into the first reheater 103A and the second reheater 103B and is resuperheated. The resuperheated steam is supplied to the low-pressure turbine 111C via a steam line L5 and the intermediate-pressure turbine 111B, and drives the intermediate-pressure turbine 111B and the low-pressure turbine 111C to rotate. The rotating shaft of the steam turbine 111 rotates and drives the generator 113 to generate electricity. The steam discharged from the low-pressure turbine 111C is cooled in the condenser 112 to become condensed water, and is sent again to the economizer 104 via the water supply line L1.

[0021] [Condenser system] Next, details of the condenser system 100A according to the first embodiment of the present disclosure will be described with reference to FIG. The condenser system 100A according to this embodiment includes a condenser 112, a vacuum pump 51, and a storage tank 52. One end of a non-condensable gas extraction line (gas extraction line) L7 is connected to the condenser 112, and the vacuum pump 51 is provided on the gas extraction line L7. The vacuum pump 51 extracts non-condensable gases (hereinafter simply referred to as "gas") such as air from within the condenser 112. This maintains a vacuum within the condenser 112.

[0022] The other end of the gas extraction line L7 is connected to a storage tank 52, which is configured to supply non-condensable gas extracted from the condenser 112 by the vacuum pump 51. The storage tank 52 separates and stores moisture contained in the non-condensable gas extracted by the vacuum pump 51 and supplied from the vacuum pump 51. The storage tank 52 is configured to receive seal water, makeup water, and moisture contained in the non-condensable gas from the condenser 112. The makeup water is supplied primarily for the initial water filling purpose to maintain a constant water level in the storage tank 52. The storage tank 52 is open to the atmosphere, allowing gas from which moisture has been separated to be released into the atmosphere. The vacuum pump 51 is a water-sealed vacuum pump, and the storage tank 52 is a vacuum pump seal water tank. That is, the storage tank 52 stores seal water to be supplied to the vacuum pump 51.

[0023] The storage tank 52 can be drained from the top and bottom. The amount of water stored inside the top of the storage tank 52 is managed at a predetermined liquid level, and any water exceeding the liquid level is discharged to the outside of the storage tank 52 as overflow water (excess water). Note that drainage from the bottom of the storage tank 52 is only carried out during maintenance. Note that the overflow water has a high pH. More specifically, the overflow water has a high pH because it contains ammonia water.

[0024] An open-to-air tank (condensate recovery tank) 54 is connected to the condenser 112 via a condenser line L9. The piping of the condenser line L9 is connected at a height position that is below the hot well level (predetermined liquid level) of the condenser 112. The open-to-air tank 54 is capable of storing water supplied from a drain water line (not shown) that recovers drain water generated at various locations in the steam power plant 1. A differential pressure adjustment valve 55 is provided on the condenser line L9. The differential pressure adjustment valve 55 adjusts the water level in the open-to-air tank 54, thereby maintaining the differential pressure between the condenser 112 side and the open-to-air tank 54 side.

[0025] This embodiment is characterized in that an overflow water return line L8 is connected between the storage tank 52 and the open-to-atmosphere tank 54. This allows overflow water from the storage tank 52 to be collected in the open-to-atmosphere tank 54. Because the open-to-atmosphere tank 54 is connected to the condenser 112 via the condenser line L9, providing the overflow water return line L8 makes it possible to return (supply) the overflow water from the storage tank 52 to the condenser 112 side via the open-to-atmosphere tank 54.

[0026] In addition, the overflow water return line L8 is provided with a U-seal 53. The U-seal 53 is a U-shaped pipe that is folded back at the bottom. The U-seal 53 adjusts the pressure difference between the storage tank 52 and the open-to-atmosphere tank 54.

[0027] In this embodiment, the pressure inside the condenser 112 is a vacuum and is therefore approximately 0 MPa(a). Although the storage tank 52 is open to the atmosphere, a pressure loss ΔP1 occurs due to the exhaust pipe of the storage tank 52. Therefore, the pressure inside the storage tank 52 becomes (atmospheric pressure + ΔP1) MPa(a), which is higher than atmospheric pressure by the amount of the pressure loss ΔP1. Similarly, although the open-to-atmosphere tank 54 is open to the atmosphere, a pressure loss ΔP2 occurs due to the exhaust pipe of the open-to-atmosphere tank 54. Therefore, the pressure inside the open-to-atmosphere tank 54 becomes (atmospheric pressure + ΔP2) MPa(a), which is higher than atmospheric pressure by the amount of the pressure loss ΔP2.

[0028] In addition, a water supply line L1 equipped with a condensate pump 121 is connected to the lower part of the condenser 112, and the condensate produced by cooling in the condenser 112 is sent to the economizer 104 via the water supply line L1.

[0029] Next, an example of a method of operating the above-described condenser system 100A will be described. The method of operating the condenser system 100A according to this embodiment includes a step of returning overflow water from the storage tank 52 to the condenser 112 in the condenser system 100A. Specifically, the overflow water is sent from the storage tank 52 to the open-to-atmosphere tank 54 via the overflow water return line L8. Next, the overflow water is sent from the open-to-atmosphere tank 54 to the condenser 112 via the condenser line L9.

[0030] The actions and effects of the condenser system 100A and the method for operating the condenser system 100A according to the present embodiment described above will be described.

[0031] The condenser system 100A according to this embodiment includes a storage tank 52 that separates and stores moisture from the non-condensable gas extracted by the vacuum pump 51 and delivered from the vacuum pump 51, and an overflow water return line L8 that returns overflow water (excess water) from the storage tank to the condenser 112. In conventional configurations, overflow water from the storage tank 52 is discharged outside the system. This results in makeup water being wasted. In contrast, the condenser system 100A according to this embodiment can return overflow water from the storage tank 52 to the condenser 112 without discharging it outside the system. This allows the overflow water to be reused within the system, thereby reducing the waste of makeup water and the amount of makeup water required. Note that overflow water refers to moisture above a predetermined liquid level in the storage tank 52.

[0032] In recent years, the quality of circulating water in steam power plants has often been controlled by injecting ammonia to achieve a high pH (High-AVT operation). Therefore, the moisture in the non-condensable gas extracted from the condenser 112 by the vacuum pump 51 and separated in the storage tank 52 (the water in the storage tank 52 and the overflow water) contains ammonia and has a high pH. The overflow water is discharged into a pit near the storage tank, which has caused a problem of an ammonia odor near the pit where the water is discharged. Furthermore, the high pH of the overflow water has also caused a problem of a high load on the wastewater treatment equipment at the destination of the wastewater, which must treat the high-pH wastewater. On the other hand, with the condenser system 100A according to this embodiment, the overflow water can be returned to the condenser 112 side without being discharged outside the system, thereby reducing the unpleasant odor caused by ammonia in the vicinity of the pit where the seal water is discharged. Furthermore, since the treatment of high-pH wastewater can be suppressed, the load on the wastewater treatment facility can be reduced. Furthermore, since the overflow water can be reused within the system, the amount of ammonia injected into the system can also be reduced.

[0033] In the operating method of the condenser system 100A according to this embodiment, the condenser system 100A includes a storage tank 52 that separates and stores moisture from non-condensable gas extracted by a vacuum pump 51 and delivered from the vacuum pump 51. The condenser system 100A includes a process of returning overflow water (excess water) from the storage tank 52 to the condenser 112. In conventional operating methods of condenser systems, the overflow water from the storage tank is discharged outside the system. Therefore, makeup water is wasted. In contrast, the operating method of the condenser system 100A according to this embodiment allows the overflow water from the storage tank 52 to be returned to the condenser 112 without being discharged outside the system. This allows the overflow water to be reused within the system, thereby suppressing waste of makeup water and reducing the amount of makeup water.

[0034] Second Embodiment Next, a condenser system 100B according to a second embodiment of the present disclosure will be described with reference to Fig. 3. This embodiment is a modified example of the first embodiment, and is the same as the first embodiment except where specifically described below, and therefore, description thereof will be omitted below.

[0035] As shown in Fig. 3, in the condenser system 100B according to the second embodiment, unlike the first embodiment, an overflow water return line L8 connects the storage tank 52 and the condenser 112 without passing through an atmospheric open tank 54. The piping of the overflow water return line L8 is connected to a position below the hot well level (predetermined liquid level) of the condenser 112. In addition, a differential pressure adjustment valve 56 is provided in the overflow water return line L8 as a differential pressure adjustment mechanism. The differential pressure adjustment valve 56 adjusts the water level in the storage tank 52.

[0036] In this embodiment, the pressure inside the condenser 112 is a vacuum and is therefore approximately 0 MPa(a). Although the storage tank 52 is open to the atmosphere, a pressure loss ΔP1 occurs due to the exhaust pipe of the storage tank 52. Therefore, the pressure inside the storage tank 52 becomes (atmospheric pressure + ΔP1) MPa(a), which is higher than atmospheric pressure by the amount of the pressure loss ΔP1.

[0037] In this embodiment, the overflow water return line L8 does not include the U-seal 53 of the first embodiment. However, the overflow water return line L8 may be provided with a U-seal 53 instead of the differential pressure control valve 56, or both. For example, when an existing plant is modified to have the condenser system 100B of this embodiment by using a U-seal 53 without a differential pressure control valve 56, the water level in the storage tank 52 must be raised by approximately 10 m (a water column equivalent to atmospheric pressure) to ensure a predetermined differential pressure. Therefore, if the installation of a U-seal 53 is difficult due to the installation location, it is preferable to provide a differential pressure control valve 56. A predetermined differential pressure must be maintained between the supply destination of the overflow water (the condenser 112 or the atmospheric open tank 54) and the storage tank 52. This predetermined differential pressure is ensured by a differential pressure control mechanism (the differential pressure control valve 56 or the U-seal 53).

[0038] The actions and effects achieved by the condenser system 100B according to the present embodiment described above will be described. When modifying a conventional condenser system that does not use an atmospherically open tank (condensate recovery tank), the condenser system 100B of this embodiment can be created by connecting an overflow water return line L8 (e.g., a pipe) between the storage tank 52 and the condenser 112.

[0039] Furthermore, although the inside of the condenser 112 is a vacuum, the storage tank 52 side is a pressurized (positive pressure) side, so if they are connected by piping, for example, there is a possibility that overflow water will be sent forcefully to the condenser 112 side. Therefore, by providing a differential pressure adjustment valve 56 as a differential pressure adjustment mechanism to ensure a predetermined differential pressure, it is possible to prevent the overflow water from being sent suddenly to the condenser 112. As the differential pressure adjustment mechanism, a U-seal 53 (U-shaped piping) can also be used instead of the differential pressure adjustment valve 56.

[0040] Plants to which the condenser system of the present disclosure can be applied include, but are not limited to, GTCC (Gas Turbine Combined Cycle) plants equipped with a heat recovery boiler that uses exhaust heat from a gas turbine as a steam generator, and plants equipped with a boiler (a once-through boiler or a drum boiler) that uses the heat of fuel combustion gas generated by a burner as a steam generator. As mentioned above, when considering the problems of odor from overflow water and the treatment of high pH water, even better results can be expected when applied to waste heat recovery boilers, where High-AVT operation is the norm.

[0041] The condenser system, the steam power plant, and the method of operating the condenser system described in the above-described embodiments can be understood, for example, as follows. A condenser system according to a first aspect of the present disclosure includes a condenser that cools and condenses steam exhausted from a steam turbine, a vacuum pump that extracts gas from the condenser, a storage tank that separates and stores moisture in the gas extracted by the vacuum pump and delivered from the vacuum pump, and an overflow water return line that returns overflow water from the storage tank to the condenser side.

[0042] The above-described configuration includes a storage tank that separates and stores moisture from the gas extracted by the vacuum pump and delivered from the vacuum pump, and an overflow water return line that returns overflow water (excess water) from the storage tank to the condenser. In conventional configurations, overflow water from the storage tank is discharged outside the system. Therefore, makeup water is wasted. In contrast, the condenser system disclosed herein can return overflow water from the storage tank to the condenser without discharging it outside the system. This allows the overflow water to be reused within the system, thereby reducing the waste of makeup water and reducing the amount of makeup water. Note that overflow water refers to moisture above a predetermined liquid level, which is maintained in the storage tank.

[0043] A second aspect of the present disclosure provides a condenser system according to the first aspect, wherein the overflow water contains ammonia.

[0044] In recent years, the quality of circulating water at steam power plants has often been controlled by injecting ammonia to achieve a high pH (High-AVT operation). Consequently, the moisture in the non-condensable gases extracted from the condenser by a vacuum pump and separated in the storage tank (the water in the storage tank and the overflow water) contains ammonia and has a high pH. The overflow water is discharged into a pit near the storage tank, but this has caused problems with an ammonia odor near the pit. Furthermore, the high pH of the overflow water has also caused problems with the high-pH wastewater treatment facilities at the destination. On the other hand, the condenser system disclosed herein can return overflow water to the condenser side without discharging it outside the system, thereby reducing the unpleasant odor caused by ammonia near the pit where the seal water is discharged. Furthermore, since the treatment of high-pH wastewater can be suppressed, the load on the wastewater treatment facility can be reduced. Furthermore, since the overflow water can be reused within the system, the amount of ammonia injected into the system can also be reduced.

[0045] A condenser system according to a third aspect of the present disclosure is the condenser system of the first or second aspect, wherein the overflow water return line is connected to the condenser.

[0046] When modifying a conventional condenser system that does not use an atmospherically open tank (condensate recovery tank), the condenser system of the present disclosure can be created by connecting an overflow water return line (e.g., piping) between the storage tank and the condenser.

[0047] A condenser system according to a fourth aspect of the present disclosure is the condenser system of any one of the first to third aspects, wherein the overflow water return line is provided with a differential pressure adjustment mechanism.

[0048] Although the condenser is under vacuum, the tank side is under pressure (positive pressure), so if it is connected by piping, there is a possibility that overflow water will be sent to the condenser side with great force. Therefore, by providing a differential pressure adjustment mechanism to ensure a predetermined differential pressure, it is possible to prevent overflow water from being sent to the condenser too quickly. A differential pressure adjustment valve or a U-seal (U-shaped piping) can be used as the differential pressure adjustment mechanism.

[0049] A condenser system according to a fifth aspect of the present disclosure, in the first or second aspect, comprises an atmospherically open tank that can be opened to the atmosphere and stores water, a condenser line that supplies water in the atmospherically open tank to the condenser, and a differential pressure adjustment mechanism provided in the condenser line, and the overflow water return line is connected to the atmospherically open tank.

[0050] If a conventional condenser system is equipped with an open-to-atmosphere tank (condensate recovery tank) with a differential pressure adjustment mechanism installed in the condenser line, it can be configured to return overflow water to the open-to-atmosphere tank. In this case, since the condenser line is equipped with a differential pressure adjustment mechanism and the open-to-atmosphere tank can be opened to the atmosphere, it is not necessary to install a separate differential pressure adjustment mechanism in the overflow water return line.

[0051] A steam power plant according to a sixth aspect of the present disclosure includes the condenser system of any one of the first to fifth aspects.

[0052] A steam power plant equipped with the condenser system of the present disclosure can reduce the amount of makeup water in the condenser system, making it an efficient steam power plant.

[0053] A seventh aspect of the present disclosure provides a method for operating a condenser system including a condenser that cools and condenses steam exhausted from a steam turbine, a vacuum pump that extracts gas from the condenser, and a storage tank that separates and stores moisture from the gas extracted by the vacuum pump and delivered from the vacuum pump, the method including a step of returning overflow water from the storage tank to the condenser side.

[0054] The method for operating a condenser system disclosed herein uses a condenser system including a storage tank that separates and stores moisture from gas extracted by a vacuum pump and delivered from the vacuum pump, and includes a process of returning overflow water (excess water) from the storage tank to the condenser. In conventional methods for operating a condenser system, overflow water from the storage tank is discharged outside the system. This results in makeup water being wasted. In contrast, the method for operating a condenser system disclosed herein allows overflow water from the storage tank to be returned to the condenser without being discharged outside the system. This allows the overflow water to be reused within the system, thereby suppressing waste of makeup water and reducing the amount of makeup water required. [Explanation of symbols]

[0055] 1 Steam power plant 10. Boiler 51 Vacuum Pump 52 Storage Tank 53 U seal (differential pressure adjustment mechanism) 54 Atmospheric open tank 55 Differential pressure adjustment valve (differential pressure adjustment mechanism) 56 Differential pressure adjustment valve (differential pressure adjustment mechanism) 100A, 100B Condenser System 101 Evaporator 102 Superheater 103 Reheater 104 Economizer 111 Steam turbine 112 Condenser 113 Generator 121 Condensate pump (CP) 122 Low pressure water heater 123 Boiler Feed Pump (BFP) 124 High-pressure water heater 125 Brackish water separator 126 Steam separator drain tank 127 Boiler Circulation Pump (BCP) L1 water supply line L2 drain water line L3~L5 steam lines L6 Circulation Line L7 Non-condensable gas extraction line (gas extraction line) L8 Overflow water return line L9 Condenser Line

Claims

1. a condenser that cools and condenses steam exhausted from the steam turbine; a vacuum pump for extracting gas from the condenser; a storage tank that separates and stores moisture in the gas extracted by the vacuum pump and delivered from the vacuum pump; an overflow water return line that returns overflow water from the storage tank to the condenser side; A condenser system comprising:

2. The condenser system of claim 1 , wherein the overflow water contains ammonia.

3. The condenser system of claim 1 , wherein the overflow water return line is connected to the condenser.

4. The condenser system according to any one of claims 1 to 3, wherein the overflow water return line is provided with a differential pressure adjustment mechanism.

5. an atmospheric open tank that can be opened to the atmosphere and stores moisture; a condenser line that supplies moisture in the open-to-atmosphere tank to the condenser; a differential pressure adjustment mechanism provided in the condenser line; Equipped with The condenser system according to claim 1 , wherein the overflow water return line is connected to the open-to-atmosphere tank.

6. A steam power plant comprising the condenser system according to any one of claims 1 to 3.

7. A method for operating a condenser system including a condenser that cools and condenses steam exhausted from a steam turbine, a vacuum pump that extracts gas from the condenser, and a storage tank that separates and stores moisture in the gas extracted by the vacuum pump and delivered from the vacuum pump, comprising: A method for operating a condenser system, comprising a step of returning overflow water from the storage tank to the condenser side.

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