JP5374270B2 - Condenser vacuum adjustment device, vacuum adjustment method, and steam turbine plant - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device and a method for adjusting the vacuum of a condenser easily configurable without complicating piping, and to provide a steam turbine plant. <P>SOLUTION: The device 20 for adjusting the vacuum of the condenser used for the steam turbine plant 10 includes an air ejector 62 extracting air from the condenser 18 by the use of negative pressure that is produced through a venturi effect by a flow of driving air, and a vacuum pump 60 making the driving air flow inside the air ejector 62. The air ejector 62 includes an outside air port 88 and an air conditioning valve 90 as "extracting ability reducing means" for reducing an extracting ability by mixing air in the atmosphere in the driving air taken inside the air ejector 62. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a condenser vacuum adjusting device and a vacuum adjusting method for adjusting a degree of vacuum in a condenser for cooling and condensing steam discharged from a main turbine, and a steam turbine plant including the vacuum adjusting device.

  Steam-powered ships, power plants, and the like include a “steam turbine plant” for obtaining power from steam. A general “steam turbine plant” has a boiler that generates steam from water, a main turbine that obtains motive power from the steam, and cools and condenses steam discharged from the main turbine (hereinafter referred to as “condensate”). )), A deaerator for removing air dissolved in the condensate, and a feed water pump for supplying the boiler with degassed water (hereinafter referred to as “water supply”). ing. Then, these devices are connected via a pipe so that the “steam system” from the boiler to the condenser, the “condensation system” from the condenser to the deaerator, and the deaerator to the boiler are connected. A “water supply system” is established.

  In general condensers, seawater is used as “cooling water”, and the degree of vacuum in the condenser (hereinafter referred to as “condenser vacuum degree”) depends on the temperature of the seawater. It is desirable that the temperature is stable around the design temperature (for example, 24 ° C. or 27 ° C.). However, the temperature of the seawater actually varies in the range of 10-30 ° C depending on the voyage area and season, so it may deviate significantly from the design temperature, and if the seawater temperature is too low, The condenser vacuum may increase beyond the allowable operating range. When the condenser vacuum level rises significantly, the steam near the rotor blades located at the final stage of the main turbine becomes “wet steam” and drain erosion (erosion by water droplets) occurs on the rotor blades. However, the rotor blade may be damaged. In addition, the exhaust loss near the rotor blade located in the final stage may increase, and the steam consumption rate of the main turbine may be deteriorated.

  Therefore, various techniques for solving these problems have been developed in the past. For example, Patent Document 1 discloses a “vacuum degree control device” that can easily adjust the condenser vacuum degree. It is disclosed. This “vacuum degree control device” includes a vacuum exhaust pipe having one end connected to a condenser and the other end connected to a vacuum pump, and a part upstream of the vacuum pump in the flow path of the vacuum exhaust pipe And a vacuum control valve provided on the vacuum control pipe. When the condenser vacuum level is higher than a predetermined vacuum level, the vacuum control valve is opened. Thus, outside air is taken into the vacuum exhaust pipe, thereby intentionally lowering the exhaust efficiency and reducing the condenser vacuum level to a specified vacuum level or lower.

JP 2006-349314 A (FIG. 1)

  According to the “vacuum degree control device” of Patent Document 1, it is possible to easily adjust the condenser vacuum degree simply by taking air from the outside into the vacuum exhaust pipe. Since there was a branch pipe, and the vacuum control valve was provided in this vacuum control pipe, there was a problem that the piping was complicated. Moreover, since the air taken in from the vacuum control valve is caused to flow into the vacuum exhaust pipe, there is a problem that the burden on the deaerator is increased by the air flowing into the “condensate system”. In other words, the main purpose of installing a deaerator at the end of the “condensate system” is to prevent the equipment that makes up the “steam turbine plant” from corroding with air by removing air from the condensate. However, in the “vacuum degree control device” described in Patent Document 1, there is a possibility that air may flow into the “condensate system”, in which case the burden on the deaerator is increased. Therefore, there has been a problem that the anticorrosion effect is significantly inhibited.

  The present invention has been made to solve the above-described problems, and provides a condenser vacuum adjustment apparatus and vacuum adjustment method, and a steam turbine plant that can be easily configured without complicated piping. The purpose is to do. Also provided are a condenser vacuum adjustment device and method, and a steam turbine plant that can easily adjust the condenser vacuum while preventing air from flowing into the condensate system. The purpose is to do.

  In order to solve the above-mentioned problem, a vacuum regulator for a condenser according to the present invention includes an air ejector that extracts air from a condenser by using a negative pressure generated by a venturi effect caused by a flow of driving air, and A condenser vacuum adjusting device comprising a vacuum pump for allowing the driving air to flow into an air ejector, wherein the air ejector mixes air in the atmosphere with the driving air taken into the air ejector. It has the extraction capability reduction means which reduces extraction capability by doing.

  In this configuration, the air extraction capability of the air ejector can be reduced by mixing the air in the atmosphere with the drive air taken into the air ejector, and the condenser vacuum level can be reduced easily and quickly. Can do. Accordingly, it is possible to reliably prevent the occurrence of drain erosion or the like due to the increase in the condenser vacuum degree with a simple configuration.

  The air ejector includes a diffuser having a throat portion, a suction chamber provided at a base end portion of the diffuser, a nozzle for supplying the driving air to the throat portion, and air in the condenser in the suction chamber. The air extraction capacity reducing means adjusts the flow rate of the atmospheric air that is taken into the outside air port and the outside air port that causes the air in the atmosphere to flow into the suction chamber. You may have a valve.

  In this configuration, since the extraction capability reducing means has the outside air port and the air conditioning valve, the mechanism for reducing the extraction capability of the air ejector can be configured simply and compactly.

  An extraction flow path that communicates the condenser and the air ejector, and an air that is disposed in the extraction flow path and that is taken in from the air conditioning valve flows into the condenser through the extraction flow path. And a check valve for preventing.

  In this configuration, since the check valve can prevent air from flowing into the condenser, the burden on the deaerator disposed at the end point of the “condensation system” is prevented from increasing. Can do.

  You may provide the pressure gauge which measures the vacuum degree in the said condenser, and the control apparatus which controls the opening / closing operation | movement of the said air-conditioning valve based on the output of the said pressure gauge.

  In this configuration, the condenser vacuum degree can be automatically adjusted by the control device.

  In order to solve the above problems, a vacuum adjusting method for a condenser according to the present invention includes an air ejector that extracts air from a condenser using a negative pressure generated by a venturi effect caused by a flow of driving air, and A condenser vacuum adjustment method using a condenser vacuum adjustment device comprising a vacuum pump for allowing the drive air to flow into an air ejector, and measuring the degree of vacuum in the condenser; And, when the degree of vacuum is higher than a predetermined set value, mixing the air in the atmosphere with the driving air taken into the air ejector.

  In this configuration, when the air in the atmosphere is mixed with the driving air taken into the air ejector, the pressure inside the air ejector increases, and the bleed capacity of the air ejector is reduced. Accordingly, when the condenser vacuum degree is higher than a predetermined set value, the amount of air extracted from the condenser is reduced, and the condenser vacuum degree is reduced. The means for mixing the air in the atmosphere with the drive air is not particularly limited, and for example, an automatically controlled air conditioning valve or a manual air conditioning valve may be used. .

  In order to solve the above problems, a steam turbine plant according to the present invention includes a steam system having a boiler that generates steam from feed water, a main engine turbine that is driven by the steam generated by the boiler, and an exhaust gas from the main engine turbine. A condenser having a condenser for condensing the generated steam to generate condensate, a deaerator for removing air from the condensate, and a water supply system having a water supply pump for supplying the water to the boiler; And a bleed system having the above-described vacuum adjusting device (including a check valve).

  In this configuration, air is removed from the condensate by the deaerator that constitutes the “condensation system”, and air flows into the condensate system by the check valve of the vacuum regulator that constitutes the “bleeding system”. Therefore, corrosion of the equipment due to air can be effectively prevented. In addition, since the vacuum adjusting device is used, it is possible to reliably prevent the occurrence of drain erosion or the like due to an increase in the condenser vacuum degree with a simple configuration.

  According to the condenser vacuum adjusting device, vacuum adjusting method, and steam turbine plant of the present invention, it can be easily configured without requiring complicated piping. In particular, according to the configuration including the check valve, it is possible to easily adjust the condenser vacuum degree while preventing the air from flowing into the “condensate system”, so that the equipment is corroded by the air. It is possible to reliably prevent the occurrence of drain erosion and the like while preventing the above.

FIG. 1 is a system diagram showing the configuration of the steam turbine plant according to the first embodiment. FIG. 2 is a cross-sectional view showing a configuration of an air ejector used in the steam turbine plant according to the first embodiment. FIG. 3 is a block diagram showing a control block used in the steam turbine plant according to the first embodiment. FIG. 4 is a graph showing the results of a vacuum adjustment test for the steam turbine plant according to the first embodiment. FIG. 5 is a system diagram showing the configuration of the steam turbine plant according to the second embodiment.

  Hereinafter, a condenser vacuum adjusting device and a vacuum adjusting method according to an embodiment of the present invention, and a steam turbine plant will be described in detail with reference to the drawings. In the following embodiments, the present invention is configured for ships.

(First embodiment)
[Overall configuration of steam turbine plant]
First, the overall configuration of the steam turbine plant 10 according to the first embodiment will be described with reference to FIG. The steam turbine plant 10 is a device for obtaining power for rotating the propeller 12 of the ship from steam. The boiler 14, the main turbine 16, the condenser 18, the vacuum regulator 20, the condensate pump 22, the ground condenser 24, A low-pressure feed water heater 26, a deaerator 28, a feed water pump 30, and a high-pressure feed water heater 32 are provided. And these apparatuses are connected via piping 34a-34d, and the steam system L1, the condensate system L2, the feed water system L3, and the extraction system L4 are comprised.

  The boiler 14 generates heat energy by burning fuel (heavy oil or the like) and transmits the heat energy to water (feed water), and the steam generated by the boiler 14 is piped. It is given to the main turbine 16 through 34a.

  The main engine turbine 16 is a “steam turbine” that extracts power from steam, and includes a high-pressure turbine 40 and a low-pressure turbine 42 in order to efficiently extract power from the steam stepwise. The high-pressure turbine 40 includes a turbine rotor 40a and a plurality of stages of rotor blades (not shown). The high-pressure steam applied from the boiler 14 acts on the rotor blades of each stage, so that the turbine rotor 40a It is rotated. On the other hand, the low-pressure turbine 42 includes a turbine rotor 42a and a plurality of stages of rotor blades (not shown), and low-pressure steam supplied from the high-pressure turbine 40 acts on the rotor blades of each stage to generate a turbine rotor. 42a is rotated. Then, the rotational force of the turbine rotors 40a and 42a is applied to the propeller shaft 12a via the speed reducer 44, and the propeller 12 is rotated.

  The condenser 18 includes a condenser main body 18a communicated with the discharge port of the low-pressure turbine 42, a plurality of cooling pipes (not shown) disposed inside the condenser main body 18a, and inlets of the plurality of cooling pipes. An inlet 18b formed on one side of the condenser main body 18a and an outlet 18c formed on the other side of the condenser main body 18a in communication with the outlets of the plurality of cooling pipes. Have. In addition, a pressure gauge 50 for measuring the degree of vacuum in the condenser 18 (that is, the condenser vacuum degree) is attached to the condenser body 18a, and a plurality of cooling pipes are supplied to the inlet 18b. A thermometer 52 for measuring the temperature of the seawater (that is, cooling water) is attached. The condenser main body 18a is connected to the condensate pump 22 via a pipe 34b, and to the vacuum regulator 20 via a pipe 34d. Note that the pressure gauge 50 is a component of the vacuum adjustment device 20, so its function will be mentioned in the description of the vacuum adjustment device 20.

  In the condenser 18, steam is supplied from the low-pressure turbine 42 into the condenser main body 18 a, and seawater is given to the plurality of cooling pipes from the inlet 18 b, and the steam in the condenser main body 18 a is converted into the cooling pipe. It is cooled and condensed by seawater and returned to the condensate. And the seawater heat-exchanged with the steam is discharged | emitted from the exit part 18c, and the condensate produced | generated from the steam is discharged | emitted from the piping 34b. Further, the air accumulated in the condenser main body 18a is constantly extracted by the vacuum adjusting device 20, and the condenser vacuum degree is kept substantially constant (in this embodiment, about −96.3 KPa (722 mmHgv)). . As a result, a certain heat drop is maintained in the main engine turbine 16, and a decrease in the thermal efficiency of the main engine turbine 16 is prevented.

  The vacuum adjusting device 20 adjusts the condenser vacuum degree as needed while constantly extracting the air in the condenser 18 and has a configuration unique to the present invention. Therefore, the vacuum adjusting device 20 will be described in detail later in [Configuration of vacuum adjusting device].

  The condensate pump 22 sucks the condensate in the condenser 18 and pumps it to the ground condenser 24. The ground condenser 24 heats the condensate using steam leaked from the turbine gland. The low-pressure feed water heater 26 further heats the condensate using steam extracted from the steam flow path of the main turbine 16, and the deaerator 28 removes air and non-condensable gas from the condensate. Is to remove. A water tank is provided in the lower part of the deaerator 28, and the water stored in the water tank is supplied to the boiler 14, so that it is referred to as “water supply”. Since the deaerator 28 generates feed water from the condensate, it is the end point of the condensate system L2 and the start point of the feed water system L3.

  The feed water pump 30 sucks feed water from the deaerator 28 and pumps it to the high pressure feed water heater 32. The high pressure feed water heater 32 uses the steam extracted from the steam flow path of the main turbine 16 to feed water. The high-temperature feed water discharged from the high-pressure feed water heater 32 is given to the boiler 14 by the discharge pressure of the feed water pump 30. Then, steam is generated from the feed water in the boiler 14.

[Configuration of vacuum control device]
Hereinafter, the vacuum adjusting device 20 will be described in detail with reference to FIGS. 1 and 2. The vacuum adjusting device 20 includes a vacuum pump 60, an air ejector 62, a check valve 64, a control device 66, and a pressure gauge 50.

  As shown in FIG. 1, the vacuum pump 60 separates air from water-sealed pump 70, a drive motor 72 that drives the water-sealed pump 70, and water discharged from the discharge port 70 a of the water-sealed pump 70. A sealed water tank 74 and a sealed water cooler 76 that cools the overflow water discharged from the sealed water tank 74, and the upper surface of the sealed water tank 74 is for extracting air separated from the water. The exhaust port 74a is formed. The circulation flow path R is configured so that the water discharged from the sealed water cooler 76 returns to the sealed water cooler 76 through the sealed water pump 70 and the sealed water tank 74, and the sealed water pump 70. The discharge port of the air ejector 62 (that is, the tip of the diffuser 80) 80b is connected to the suction port 70b.

  As shown in FIG. 2, the air ejector 62 includes a diffuser 80, a suction chamber 82, a nozzle 84, an extraction port 86, an outside air port 88, and an air conditioning valve 90.

  The diffuser 80 is a substantially trumpet-shaped member having a throat portion (narrowest portion) 92 in the vicinity of the base end portion 80 a, and a suction chamber 82 is connected to the base end portion 80 a of the diffuser 80. The suction chamber 82 is a hollow member that constitutes a flow path Q that joins air from the nozzle 84, the extraction port 86, and the outside air port 88 to give to the diffuser 80. A hole-shaped nozzle is attached to the side wall of the suction chamber 82. A mouth 82a, a tubular bleed port 86, and a tubular outside air port 88 are provided independently of each other. A nozzle 84 is attached to the nozzle attachment port 82 a and an air conditioning valve 90 is attached to the outside air port 88.

  The nozzle 84 is a cylindrical member in which the inner diameter of the distal end portion 84a is increased in a taper shape, and the distal end portion 84a of the nozzle 84 faces the proximal end portion 80a of the diffuser 80 inside the suction chamber 82, The base end portion 84b of the nozzle 84 is open to the atmosphere. In a state where the nozzle 84 is attached to the nozzle attachment port 82 a, the axis of the nozzle 84 and the axis of the diffuser 80 coincide with each other, and the outside air (that is, driving air) flowing into the suction chamber 82 from the nozzle 84 is the throat portion of the diffuser 80. It is going straight to 92.

  The air conditioning valve 90 takes in atmospheric air (that is, outside air) from the outside air port 88 while adjusting the flow rate, and can be opened and closed inside the valve housing 90a attached to the outside air port 88 and the valve housing 90a. It has a disposed valve body (not shown) and a valve opening / closing device 90b for driving the valve body. The valve opening / closing device 90b is driven based on a control signal given from the control device 66 (FIG. 1), and is configured so that the valve opening degree corresponding to the control signal can be arbitrarily selected steplessly. . In the present embodiment, as will be described later, since the outside air taken into the suction chamber 82 through the air conditioning valve 90 and the outside air port 88 is mixed with the driving air, the bleeding ability of the air ejector 62 is reduced. 88 and the air-conditioning valve 90 are “bleeding capacity reducing means”.

  As shown in FIG. 1, the check valve 64 is an air flow path (hereinafter referred to as “extraction flow path”) in which the air in the suction chamber 82 of the air ejector 62 communicates with the condenser 18 and the air ejector 62. In this embodiment, a check valve 64 is attached to the upstream end portion of the bleed port 86 to prevent the gas from flowing into the condenser 18 through G. The position of the check valve 64 is not particularly limited as long as it is in the “bleeding flow path G”. For example, the check valve 64 is arranged in the middle of the pipe 34 d constituting the “bleeding flow path G”. It may be provided.

  The control device 66 (FIG. 1) controls the opening / closing operation of the air conditioning valve 90, and includes a central processing unit (CPU) that executes various arithmetic processes, and a storage device (ROM) that stores control programs and various data. , RAM), and a pressure gauge 50 and a valve opening / closing device 90b are electrically connected to the control device 66 via signal lines. When the pressure signal output from the pressure gauge 50 is given to the control device 66, the central processing unit (CPU) generates a control signal based on the pressure signal and the data stored in the storage device (ROM, RAM). This control signal is given to the valve opening / closing device 90b of the air conditioning valve 90.

  Here, the condenser vacuum degree determined by the pressure signal output from the pressure gauge 50 is “PV”, the set value stored in the storage device (ROM, RAM) is “SP”, and the air conditioning valve 90 ( When the output value of the valve opening / closing device 90b) is "OUT", the proportional gain is "K", the integration time is "Ti", and the Laplace operator is "s", the control of the air conditioning valve 90 by the controller 66 is as shown in FIG. This is performed according to the control block shown in FIG. The specific control of the air conditioning valve 90 will be described later.

[Operation of steam turbine plant]
Next, the operation of the steam turbine plant 10 will be described with reference to FIGS. 1 and 2. When the operation of the steam turbine plant 10 is started, as shown in FIG. 1, steam is generated by the boiler 14 located at the start point of the steam system L1, and this steam is given to the main turbine 16 to rotate the propeller 12 and the like. . The steam that has finished its work in the main turbine 16 is cooled and condensed by the condenser 18 and returned to the condensate, and supplied to the boiler 14 through the condensate system L2 and the water supply system L3.

  In the extraction system L4, the water ring pump 70 is driven by the drive motor 72 being rotated at a predetermined rotational speed. Then, as shown in FIG. 2, in the air ejector 62, air in the atmosphere drawn by the water-sealed pump 70 is taken into the suction chamber 82 from the nozzle 84, and this air (that is, driving air) is supplied to the diffuser 80. It is discharged from the tip 80b through the throat portion 92. At this time, since the flow of the driving air is accelerated by the venturi effect of the throat portion 92, the pressure of the throat portion 92 decreases according to Bernoulli's theorem, and the inside of the suction chamber 82 has the pressure of the throat portion 92 (negative Pressure). Therefore, the air in the condenser 18 is drawn to the negative pressure and taken into the suction chamber 82 through the pipe 34d, the check valve 64 and the extraction port 86, and the temperature of the seawater (that is, cooling water) is constant. If there is, the condenser vacuum is kept almost constant.

[Vacuum adjustment method with vacuum adjustment device]
Next, a vacuum adjustment method using the vacuum adjustment device 20 will be described with reference to FIGS. 1 and 2. When the temperature of the seawater used as “cooling water” is stable near the design temperature, it is possible to keep the condenser vacuum level within the allowable operating range even in normal operation without operating the air conditioning valve 90. . However, when the temperature of the seawater drops significantly due to the sea area, season, etc., and the condenser vacuum rises beyond the allowable operating range, as described above, drain erosion occurs on the rotor blades located at the final stage of the main turbine 16. Etc. may occur. Therefore, in this embodiment, the condenser vacuum degree (PV) is constantly measured by the pressure gauge 50, and the output value (OUT) of the air conditioning valve 90 is controlled according to the control block of FIG. That is, when the condenser vacuum degree (PV) is higher than the set value (SP), the output value (OUT) is controlled so that the valve body is opened by the valve opening / closing device 90b, and the condenser vacuum degree (PV) ) Is lower than the set value (SP), the output value (OUT) is controlled so that the valve element is closed by the valve opening / closing device 90b.

  When the air conditioning valve 90 is opened, outside air having a flow rate corresponding to the opening degree flows into the suction chamber 82 from the air conditioning valve 90 through the outside air port 88, and this outside air is taken into the air ejector 62 (that is, the suction chamber 82). By mixing with the driven air, the pressure in the suction chamber 82 is increased. Therefore, the extraction capability of the air ejector 62 is reduced according to the amount of outside air flowing into the suction chamber 82, and the condenser vacuum level is increased according to the degree of reduction of the extraction capability. The outside air flowing into the suction chamber 82 from the outside air port 88 is at a higher pressure than the air flowing into the suction chamber 82 from the bleed port 86 (that is, bleed air), but at the upstream end of the bleed port 86, there is a check valve 64. Therefore, it is possible to prevent the outside air from flowing back into the condenser 18 by flowing backward through the “bleeding flow path G”.

  In the present embodiment, the bleed capacity of the vacuum adjustment device 20 can be quickly reduced simply by taking outside air from the air conditioning valve 90, and therefore, highly responsive and accurate vacuum adjustment (reduction of the condenser vacuum degree) is possible. Thus, drain erosion or the like due to an increase in the condenser vacuum can be effectively prevented.

[Vacuum adjustment test with vacuum adjustment device]
As shown in the graph of FIG. 4, the inventor confirmed the practicality of the vacuum adjustment device 20 by the “vacuum adjustment test”. In this “vacuum adjustment test”, first, the air conditioning valve 90 of the vacuum adjustment device 20 is fully closed to maximize the extraction capability of the vacuum adjustment device 20, and the condenser vacuum is set to the upper limit value (−98. 0 KPa). Specifically, seawater at 15.3 ° C. was supplied as “cooling water” to the condenser 18 to increase the condenser vacuum level to −99.2 KPa. Subsequently, the air conditioning valve 90 was fully opened to minimize the bleed capacity of the vacuum adjusting device 20, and the change in the condenser vacuum degree with the passage of time from the time when the air conditioning valve 90 was fully opened was observed. The graph of FIG. 4 shows the relationship between the elapsed time at this time and the condenser vacuum degree.

  From the graph of FIG. 4, it can be seen that the condenser vacuum level suddenly decreased in the time zone of 6 to 9 minutes and then stabilized within the allowable operation range. That is, it can be seen that the vacuum regulator 20 can maintain the condenser vacuum level within the allowable operating range even when the temperature of the seawater is reduced to about 15.3 ° C.

(Second Embodiment)
The steam turbine plant 100 according to the second embodiment shown in FIG. 5 is configured to manually operate the air conditioning valve 112 of the air ejector 62 based on the outputs of the pressure gauge 50 and the thermometer 52. This steam turbine plant 100 is not provided with a configuration (control device 66, valve opening / closing device 90b, etc.) for automatically controlling the condenser vacuum degree, and the steam turbine plant according to the first embodiment. 10 (FIG. 1). Therefore, parts corresponding to the constituent parts of the steam turbine plant 10 (FIG. 1) are denoted by the same reference numerals as those of the constituent parts, and description of the corresponding parts is omitted.

  When adjusting the condenser vacuum degree in the steam turbine plant 100, first, the condenser vacuum degree is measured by the pressure gauge 50. If the condenser vacuum level is higher than a predetermined set value, the outside air is taken into the suction chamber 82 by manually opening the air conditioning valve 112 and taken into the air ejector 62 (ie, the suction chamber 82). The outside air is mixed with the driven air, and the bleed capacity of the vacuum adjusting device 20 is reduced. Then, since the amount of extraction from the condenser 18 is reduced, the degree of condenser vacuum is reduced according to the degree of reduction. In the second embodiment, since the outside air taken in from the air conditioning valve 112 flows into the suction chamber 82 from the outside air port 88, and the outside air is mixed with the driving air, the extraction ability of the air ejector 62 is reduced. The outside air port 88 and the air conditioning valve 112 are “extraction ability reducing means”.

  The present invention is widely applicable to applications using steam turbine plants such as ships and power plants.

L1 ... Steam system L2 ... Condensate system L3 ... Water supply system L4 ... Extraction system 10 ... Steam turbine plant 12 ... Propeller 14 ... Boiler 16 ... Main turbine 18 ... Condenser 20 ... Condenser vacuum regulator 22 ... Condensate Pump 24 ... Grand condenser 28 ... Deaerator 40 ... High-pressure turbine 42 ... Low-pressure turbine 50 ... Pressure gauge 52 ... Thermometer 60 ... Vacuum pump 62 ... Air ejector 64 ... Check valve 66 ... Control device 70 ... Water-sealed pump 80 ... Diffuser 82 ... Suction chamber 84 ... Nozzle 86 ... Bleed port 88 ... Open air port (bleeding capacity reducing means)
90 ... Air-conditioning valve (bleeding capacity reduction means)
90a ... Valve body 90b ... Valve opening / closing device 92 ... Throat section 100 ... Steam turbine plant 112 ... Air conditioning valve (extraction capability reducing means)

Claims (6)

A condenser comprising: an air ejector that extracts air from a condenser using a negative pressure generated by a venturi effect caused by a flow of driving air; and a vacuum pump that causes the driving air to flow into the air ejector. In the vacuum regulator,
The air ejector has a bleed capacity reducing means for reducing the bleed capacity by mixing air in the atmosphere with the driving air taken into the air ejector. Vacuum adjustment device. The air ejector includes a diffuser having a throat portion, a suction chamber provided at a base end portion of the diffuser, a nozzle for supplying the driving air to the throat portion, and air in the condenser in the suction chamber. And a bleed port for inflow,
2. The bleed capacity reducing means includes an outside air port through which air in the atmosphere flows into the suction chamber, and an air conditioning valve that adjusts the flow rate of the air in the atmosphere taken into the outside air port. The condenser vacuum regulator described in 1. A bleed passage for communicating the condenser and the air ejector;
The return valve according to claim 2 , further comprising: a check valve disposed in the extraction channel and preventing air taken in from the air conditioning valve from flowing into the condenser through the extraction channel. Water device vacuum regulator. A pressure gauge for measuring the degree of vacuum in the condenser;
The condenser vacuum adjusting device according to claim 3, further comprising: a control device that controls an opening / closing operation of the air conditioning valve based on an output of the pressure gauge. A condenser vacuum comprising: an air ejector that extracts air from a condenser using negative pressure generated by a venturi effect due to a flow of driving air; and a vacuum pump that causes the driving air to flow into the air ejector. A condenser vacuum adjustment method using an adjustment device,
Measuring the degree of vacuum in the condenser;
And a step of mixing air in the atmosphere with the driving air taken into the air ejector when the degree of vacuum is higher than a predetermined set value. A steam system having a boiler that generates steam from feed water and a main turbine driven by the steam generated by the boiler;
A condensate system having a condenser for condensing steam discharged from the main engine turbine to generate condensate and a deaerator for removing air from the condensate;
A water supply system having a water supply pump for supplying the water to the boiler;
A steam turbine plant comprising: a bleed system having the condenser vacuum adjusting device according to claim 3.

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