Method for starting a power generating unit, method for controlling condenser vacuum of a power generating unit, and device for controlling condenser vacuum of a power generating unit

Abstract

The start-up time of a power generation unit having a steam generator, a steam turbine rotated by steam generated by the steam generator, a condenser that cools and condenses exhaust steam from the steam turbine to produce condensed water, and a vacuum pump that sucks and discharges non-condensable gases in the condenser is shortened. [Solution] The system comprises a start-up preparation step for preparing to start up the power generation unit 1, a water quality improvement execution step for gradually executing each process of the water quality improvement process for improving the water quality within the equipment to be improved, including the condenser 4 and the once-through boiler 7 as a steam generating device, and an ignition step for preparing the once-through boiler 7 for ignition and then igniting the boiler, and the operation of increasing the vacuum of the condenser 4 is reserved in the water quality improvement execution step and is performed in the ignition preparation step of the ignition step.

Description

[Technical Field]

[0001] The present invention relates to a method for starting a power generation unit, a method for controlling the condenser vacuum of a power generation unit, and a device for controlling the condenser vacuum of a power generation unit, and more specifically to a start-up method, control method, and device that adjust the timing of vacuum rise in the condenser.

[0002] During regular inspections of thermal power plants, the steam turbine lubrication oil system is usually flushed with lubricating oil (oil flushing), and the subsequent unit startup process involves adjusting the steam turbine's main valves to achieve the specified characteristics (valve adjustment) and performing a series of operations to clean up various parts of the power generation unit. Furthermore, in a thermal power plant (power generation unit), in order to reduce the back pressure of the steam turbine as much as possible to provide the steam turbine with maximum thermal energy, and particularly when a once-through boiler is used, in order to reduce the dissolved oxygen in the water as much as possible because water quality is strictly controlled, it is necessary to start increasing the vacuum inside the condenser from atmospheric pressure (increasing the degree of vacuum inside the condenser) and make the pressure in the condenser negative, i.e., to create a vacuum (see Patent Document 1, etc.). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 61-59187 Summary of the Invention [Problem to be solved by the invention]

[0004] However, since the vacuum increase in the condenser cannot be performed during oil flushing or valve adjustment, conventionally, the valve adjustment is performed after oil flushing is completed, and then the vacuum increase in the condenser (S100) is performed during the condenser cleanup (S20), as shown in Figure 7. Then, once the vacuum increase is completed, the process moves on to cleanup of the feedwater system (low-pressure cleanup S30 or high-pressure cleanup S40). The oil flushing process takes several days, and the subsequent valve adjustment and vacuum buildup require a considerable amount of time before cleanup of the water supply system can begin. As a result, cleanup of the water supply system had to be postponed until vacuum buildup was complete, which caused inconvenience by delaying the start-up of the power generation unit.

[0005] The present invention has been made in consideration of the above circumstances, and its main objective is to provide a method for starting up a power generation unit that can shorten the start-up time of the power generation unit, a method for controlling the condenser vacuum of a power generation unit, and a condenser vacuum control device for a power generation unit. [Means for solving the problem]

[0006] The present inventors (1) The operation of reducing the back pressure of the steam turbine as much as possible to give the maximum thermal energy to the steam turbine can be performed in time during the preparation process for boiler ignition of the fuel unit. (2) Furthermore, it is preferable to carry out cleanup of the water supply system (low-pressure cleanup or high-pressure cleanup) after removing dissolved oxygen by increasing the vacuum in the condenser and vacuum deaeration using a deaerator, from the viewpoint of preventing corrosion of the thin tubes due to dissolved oxygen. However, it has been confirmed that the impact of dissolved oxygen on the equipment occurs particularly when the condensate temperature is 100°C or higher, and is almost nonexistent when the condensate temperature is below 100°C. (3) Furthermore, it is possible to prevent corrosion of the thin tubes by controlling the pH level through the injection of chemicals such as hydrazine. This led to the discovery that there is no problem with suspending the vacuum increase in the condenser until the boiler is ready to be ignited, and this led to the completion of the present invention.

[0007] That is, a start-up method for a power generation unit according to the present invention is a start-up method for a power generation unit having a steam generator, a steam turbine rotated by steam generated by the steam generator, a condenser that cools and condenses exhaust steam from the steam turbine to produce condensed water, and a vacuum pump that sucks and discharges non-condensable gas within the condenser, a start-up preparation step of preparing to start the power generation unit; a water quality improvement execution step for executing each process of a water quality improvement process in stages to improve the water quality in the water quality improvement target equipment including the condenser and the steam generator; an ignition step of preparing the boiler for ignition and igniting the boiler, The vacuum raising operation of the condenser is reserved in the water quality improvement execution step, and is executed in the ignition preparation step of the ignition step.

[0008] Conventionally, the conditions for proceeding to the cleanup process of the water supply system included the condition that the condenser had reached a predetermined vacuum level (the condenser's vacuum rise had been completed). However, after boiler cooling has been stopped and before the boiler has been ignited, the condensate temperature will not reach 100°C even if dissolved oxygen is present. Therefore, in the present invention, the step of raising the vacuum in the condenser during the water quality improvement execution step is omitted, and the requirement that the condenser's vacuum rise be completed as a condition for starting cleanup of the water supply system is eliminated.

[0009] In other words, in the past, the condenser was vacuumed up during the condensate cleanup stage of the water quality improvement execution step, and the completion of this vacuum increase was one of the conditions for cleaning up the water supply system.Therefore, if there was a delay in valve adjustment, etc., and the timing of vacuum increase was delayed, the cleanup of the water supply system would be delayed, and the start-up process of the power generation unit would be lengthened, which was an inconvenience. However, even if dissolved oxygen is present, the condensate temperature will not reach 100°C before boiler ignition after boiler cooling is stopped. Therefore, increasing the condenser vacuum is not a prerequisite for feedwater cleanup. Instead, the vacuum increase is performed during the water improvement process and is instead performed during the boiler ignition preparation stage after the water improvement process is completed, just before the condensate temperature exceeds 100°C. This eliminates the impact of dissolved oxygen on pipe corrosion and enables feedwater system cleanup to be performed simultaneously with turbine main valve adjustment during power generation unit startup preparation (feedwater system cleanup can be performed ahead of schedule, allowing it to be performed in parallel with steam turbine lubrication oil system oil flushing and valve adjustment). This shortens the time until boiler ignition preparation is complete.

[0010] In addition, in order to adjust the amount of dissolved oxygen in the condensate and prevent tube corrosion by controlling the pH, it is advisable to inject hydrazine, an alkaline deoxidizer, into the condensate to remove dissolved oxygen and make the condensate alkaline.

[0011] Furthermore, a method for controlling a vacuum degree of a condenser of a power generation unit according to the present invention is a method for controlling a vacuum degree of the condenser of a power generation unit at the start-up of the power generation unit, the power generation unit having a steam generator, a steam turbine rotated by steam generated by the steam generator, a condenser that cools and condenses exhaust steam of the steam turbine to produce condensed water, and a vacuum pump that sucks and discharges non-condensable gas in the condenser, In preparation for boiler ignition, the vacuum pump is operated to start increasing the vacuum in the condenser. Therefore, since the condenser vacuum is increased while preparing to ignite the boiler, it is possible to adjust the main turbine valves while simultaneously cleaning up the water supply system in preparation for starting up the power generation unit.

[0012] Furthermore, a condenser vacuum control device for a power generation unit is a condenser vacuum control device for a power generation unit that controls the vacuum of the condenser at the start of a power generation unit having a steam generator, a steam turbine that rotates using steam generated by the steam generator, a condenser that cools and condenses exhaust steam from the steam turbine to produce condensed water, and a vacuum pump that sucks and discharges non-condensable gases in the condenser, an ignition preparation start determination means for determining the start of ignition preparation of the boiler; a vacuum increase starting means for starting a vacuum increase in the condenser by operating the vacuum pump when the ignition preparation start determining means determines that the boiler has started preparing for ignition; It is characterized by having: Therefore, since the condenser vacuum is increased after the boiler ignition preparation has begun, it is possible to adjust the turbine's main valves while simultaneously cleaning up the water supply system in preparation for starting up the power generation unit. [Effects of the Invention]

[0013] As described above, according to the present invention, in the water quality improvement execution step in which each process of the water quality improvement execution process for improving the water quality in the equipment to be improved, including the condenser and steam generator, is executed in stages, the condenser is not vacuumed up, but is vacuumed up at the stage of preparing to ignite the boiler. This makes it possible to clean up the water supply system simultaneously with oil flushing and valve adjustment of the steam turbine lubrication oil system, thereby shortening the start-up time of the power generation unit. [Brief explanation of the drawings]

[0014] [Figure 1]FIG. 1 is a schematic system diagram illustrating an example of a power generation unit to which a unit startup method according to an embodiment of the present invention is applied. [Figure 2] FIG. 2 is a schematic system diagram illustrating the condensate clean-up process in the power generation unit of FIG. 1. [Figure 3] FIG. 2 is a schematic system diagram illustrating the low-pressure clean-up process in the power generation unit of FIG. 1. [Figure 4] FIG. 2 is a schematic system diagram illustrating the high-pressure clean-up process in the power generation unit of FIG. 1. [Figure 5] FIG. 2 is a schematic system diagram illustrating the boiler cleanup process in the power generation unit of FIG. 1. [Figure 6] FIG. 3 is a flowchart showing the steps of a method for starting up a power generation unit according to the present embodiment. [Figure 7] FIG. 1 is a flowchart showing the steps of a conventional method for starting up a power generating unit. BEST MODE FOR CARRYING OUT THE INVENTION

[0015] Hereinafter, a method for starting up a power generating unit, a method for controlling the vacuum degree of a condenser of a power generating unit, and an apparatus for controlling the vacuum degree of a condenser of a power generating unit according to embodiments of the present invention will be described.

[0016] FIG. 1 shows an example of a system diagram of a power generation unit according to this embodiment.

[0017] The power generation unit 1 has a steam turbine 2, a generator 3, a condenser 4, a condensation system 5, a feedwater system 6, a once-through boiler 7 as a steam generating device, and a vacuum control device 8 that controls the vacuum level of the condenser 4. The steam turbine 2 has a high-pressure turbine 2a and a low-pressure turbine 2b.

[0018] The generator 3 is mounted on the same shaft as the steam turbine 2, is rotationally driven by the steam turbine 2, and converts rotational energy into electrical energy. Note that this example shows a tandem compound system in which the generator 3 is mounted on the same shaft as the steam turbine 2, but a cross compound system in which the high-pressure turbine 2a and the low-pressure turbine 2b are mounted on the same shaft, with the low-pressure turbine 2b on a separate shaft and a generator mounted on each shaft, may also be used.

[0019] The condenser 4 is provided with heat transfer tubes (not shown) through which cooling water flows, and cools and condenses the exhaust steam from the steam turbine 2 to generate condensate. The condenser 4 is also provided with an exhaust pipe 11 for discharging non-condensable gas remaining in the condenser to the outside, and by controlling the operation of a vacuum pump 12 provided in this exhaust pipe 11, the degree of vacuum in the condenser 4 is increased (the back pressure of the condenser 4 is kept at a vacuum) to increase turbine efficiency. The condenser 4 is provided with a pressure gauge (not shown) that measures the pressure inside the condenser, and the vacuum control device 8 inputs a pressure signal from the pressure gauge to drive and control the vacuum pump 12.

[0020] The condensate system 5 includes a condensate pipe 13 connected to the condenser 4, a condensate pump (not shown) provided in the condensate pipe 13, a demineralizer 14 provided downstream of the condensate pump, a low-pressure feedwater heater 15, and a deaerator 16.

[0021] The demineralizer 14 removes foreign matter, ions, etc. from the condensate, and supplies the condensate from which the foreign matter, ions, etc. have been removed to a low-pressure feedwater heater 15. The condensate discharged from the outlet side of the demineralizer 14 can be recirculated between the condenser 4 and the demineralizer 14 via a condensate recirculation pipe 9. The condensate recirculation pipe 9 is provided with a cleanup valve (not shown) for starting the condensate cleanup operation.

[0022] The low-pressure feedwater heater 15 heats the condensate from which foreign matter, ions, etc. have been removed by the demineralizer 14, and uses, as its heat source, for example, extracted steam from the low-pressure turbine 2b.

[0023] The deaerator 16 brings the condensate into contact with steam to heat and deaerate the condensate, and temporarily stores the deaerated condensate. For example, steam extracted from a low-pressure turbine is used as the steam to heat the condensate.

[0024] The condensate system 5 is provided with a low-pressure clean-up pipe 17 that circulates the condensate heated and deaerated by the deaerator 16 from the outlet side of the deaerator 16 to the condenser 4. This low-pressure clean-up pipe 17 is provided with a clean-up valve (not shown) for starting the low-pressure clean-up operation.

[0025] The feedwater system 6 includes a feedwater pipe 18 leading to the deaerator 16, a feedwater pump (not shown) provided on the feedwater pipe 18, and a high-pressure feedwater heater 19. The feedwater pipe 18 connects the feedwater pump to the once-through boiler 7 via the high-pressure feedwater heater 19. The steam source for the high-pressure feedwater heater 19 is extracted steam from the high-pressure turbine 2a. The feedwater system 6 also includes a high-pressure cleanup pipe 29 that circulates condensate heated by the high-pressure feedwater heater 19 from the outlet side of the high-pressure feedwater heater 19 to the condenser 4. While the high-pressure cleanup pipe 29 may be directly connected to the condenser 4, in this example, it is connected to the middle of the low-pressure cleanup pipe 17, and the condensate heated by the high-pressure feedwater heater 19 is circulated to the condenser 4 via both cleanup pipes. The high-pressure cleanup pipe 29 is provided with a cleanup valve (not shown) for starting the high-pressure cleanup operation.

[0026] The once-through boiler 7 has an economizer 20, an evaporator 21, a steam separator 22, a drain tank 23, a primary superheater 24, and a secondary superheater 25. It also has a reheater 26, which will be described later. Note that in Fig. 1, the economizer 20, the evaporator 21, the primary superheater 24, the secondary superheater 25, and the reheater 26 are shown as different heat exchangers, but the fluid flowing outside each heat transfer tube is combustion gas flowing within the same furnace. The once-through boiler 7 further has a return pipe 27 for returning drain from the drain tank 23 to the condenser 4, and a circulation pipe 28 for circulating the drain to the economizer 20. The return pipe 27 is provided with a return valve (not shown) for adjusting the flow rate therethrough, and the circulation pipe 28 is provided with a circulation valve (not shown) for adjusting the flow rate therethrough.

[0027] The flows of main steam, condensate, and feedwater during output operation of the power generation unit 1 are as follows. The evaporator 21 absorbs the thermal energy of the once-through boiler 7 into water, vaporizing the water to generate steam. The steam is then dehydrated in the steam separator 22 and superheated in the primary superheater 24 and secondary superheater 25. This superheated steam flows into the high-pressure turbine 2a to rotate its blades, and the steam that performs work there is sent to the reheater 26 to be reheated. The reheated steam then flows into the low-pressure turbine 2b to rotate its blades, and the exhaust steam that performs work there is cooled and condensed in the condenser 4 to become condensed water. Uncondensed gases that were not condensed are discharged via the exhaust pipe 11 by the vacuum pump 12. The condensate is then degassed in the condenser, which maintains a predetermined vacuum. The condensate then passes through the demineralizer 14, low-pressure feedwater heater 15, and deaerator 16 by the condensate pump in the condensing system 5. As a result, the condensate has foreign matter, ions, etc. removed in the demineralizer 14, and is heated and deaerated in the deaerator 16 by contacting with steam.

[0028] The condensate that has been heated and deaerated in the deaerator 16 flows through the feedwater pipe 18 of the feedwater system 6 as the feedwater pump operates, passes through the high-pressure feedwater heater 19, and is supplied to the once-through boiler 7 as feedwater. The feedwater supplied to the once-through boiler 7 is heated in the economizer 20 and becomes steam again in the evaporator 21. The steam leaving the evaporator 21 has moisture separated from it in the steam separator 22 and flows into the primary superheater 24 and secondary superheater 25, where it is superheated to become superheated steam with a predetermined degree of superheat, and is sent to the steam turbine 2 again.

[0029] In the flow of the turbine working fluid during the above-mentioned output operation, as described above, in order to increase the thermal efficiency by making as large as possible the difference between the maximum temperature / pressure of the steam flowing into the steam turbine 2 and the minimum temperature / pressure of the steam that has done work in the steam turbine 2, it is common to make the pressure in the condenser 4 negative, i.e., a vacuum. After the steam turbine 2 starts up, it is possible to maintain a high degree of vacuum in the condenser by condensing the turbine exhaust steam, which is a gas, into water. However, before the steam turbine 2 starts up, there is no exhaust steam to condense, so it is necessary to use the vacuum pump 12 to increase the degree of vacuum in the condenser (to increase the vacuum).

[0030] When starting up the power generation unit 1 that is currently shut down, the above-mentioned working fluid flow paths are cleaned up sequentially starting from the condenser side, and the flow path range of the working fluid is expanded while maintaining water quality. The cleanup required in this procedure for maintaining water quality (water quality improvement process) is roughly divided into condensate cleanup, low-pressure cleanup, high-pressure cleanup, and boiler cleanup modes, and the water quality improvement process is carried out by switching between the cleanup modes in this order.

[0031] Each cleanup mode will be explained below. First, the condensate clean-up mode will be described. As shown in Fig. 2, this condensate clean-up mode is a mode in which the condensate is circulated through the demineralizer 14. In this mode, a condensate pump (not shown) is driven to form a flow path in which the condensate flows from the condenser 4 through the condensate pipe 13, the demineralizer 14, the condensate recirculation piping 9, and then returns to the condenser 4. Through this recirculation, the condensate is filtered and demineralized by the demineralizer 14.

[0032] Next, the low-pressure clean-up mode will be described. As shown in Fig. 3, this low-pressure clean-up mode is a mode in which the condensate is circulated through the deaerator 16. In this mode, a condensate pump (not shown) drives a flow path in which the condensate flows from the condenser 4 through the condensate pipe 13, the demineralizer 14, the low-pressure feedwater heater 15, the deaerator 16, the low-pressure clean-up piping 17, and then returns to the condenser 4. This circulation of the condensate causes the condensate to be heated and deaerated by the deaerator 16, and then cleaned by the demineralizer 14 until it meets predetermined conditions.

[0033] Next, in the high-pressure clean-up mode, the feedwater pump is also operated in addition to the condensate pump, and as a result, the condensate is transferred by the condensate pump from the condenser 4 to the condensate pipe 13, the demineralizer 14, the low-pressure feedwater heater 15, and the deaerator 16, as shown in Figure 4. In addition, the condensate temporarily stored in the deaerator is returned by the feedwater pump to the condenser 4 via the high-pressure feedwater heater 19, the high-pressure clean-up piping 29, and the low-pressure clean-up piping 17.

[0034] Next, in boiler cleanup mode, the feedwater pump is operated in addition to the condensate pump, and the condensate is transferred by the condensate pump from the condenser 4 to the condensate pipe 13, demineralizer 14, low-pressure feedwater heater 15, and deaerator 16, as shown in Figure 5. In addition, the condensate temporarily stored in the deaerator is supplied by the feedwater pump to the high-pressure feedwater heater 19, economizer 20, and evaporator 21, and then passes through the steam separator 22 and drain tank 23 before being returned to the condenser 4 via return pipe 27.

[0035] Conventionally, as shown in FIG. 7, after the start-up preparation (S10) of the power generation unit is performed, the above-mentioned clean-ups (condensate clean-up (S20), low-pressure clean-up (S30), high-pressure clean-up (S40), boiler clean-up (S50)) are performed, and then the boiler is prepared for ignition (S60), and the boiler is ignited (S70). However, in order to ensure the water quality in the low-pressure clean-up (S30), the vacuum increase in the condenser 4 is performed (S100) during the condensate clean-up (S20), and the transition to the low-pressure clean-up (S30) is one of the conditions that must be met before proceeding. During the periodic inspection of power generating unit 1, work to flush the bearings and other components with oil or to adjust the turbine's main valves was required, but in order to raise the vacuum, it was necessary to complete at least the oil flushing and valve adjustment work. As the oil flushing work took several days and the valve adjustment also required a considerable number of days, raising the vacuum was not possible during that time, and so cleaning up the condensate system and feedwater system could not be carried out.

[0036] In the first place, the purpose of vacuum raising is to increase the thermal efficiency of the steam turbine, as well as to remove as much dissolved oxygen as possible from the condensate, thereby preventing corrosion of the thin tubes caused by dissolved oxygen. However, it was confirmed that the effect of dissolved oxygen on piping occurs when the condensate temperature is 100°C or higher, and that there is almost no effect on piping at temperatures below 100°C. In the initial stage of preparation for start-up after a boiler is shut down due to strong cooling, the temperature of the condensate is about 30 to 40°C and does not reach 100°C. If the condensate temperature exceeds 100°C, it must be after the boiler has ignited and started to heat up. This led to the realization that there is no need to deliberately increase the vacuum when preparing to start up the power generation unit.

[0037] While oil flushing and valve adjustment are performed in the steam turbine ventilation system, condensate and feedwater cleanup is a cleaning operation in the condensate system and feedwater system, so if there are no restrictions on vacuum rise operations, they can be performed independently in the first place. Therefore, the condition of completing the vacuum buildup in the condenser 4, which was a prerequisite for performing low-pressure cleanup, was abolished, and the vacuum buildup operation was omitted from the stage of preparation for starting up the power generation unit (it was put on hold in the water quality improvement execution step, which executes each process in stages to improve the water quality in the equipment to be improved, including the condenser and steam generator).In this way, low-pressure cleanup and high-pressure cleanup were carried out ahead of schedule, and they could be carried out simultaneously with oil flushing and valve adjustment.This made it possible to significantly shorten the start-up time of the power generation unit.

[0038] As mentioned above, the vacuum raising operation is intended to increase the thermal efficiency of the steam turbine and to remove as much dissolved oxygen as possible from the condensate to prevent corrosion of the thin tubes caused by the dissolved oxygen, and is therefore eventually required to complete the start-up of the power generating unit. For this reason, as shown in Figure 6, it is best to perform the vacuum raising operation after the boiler cleanup is complete and preparations for boiler ignition have begun, but before ignition. In particular, from the perspective of shortening the start-up time of the power generating unit, it is best to perform the vacuum raising operation simultaneously with the start of preparations for boiler ignition.

[0039] Here, as a condenser vacuum control device for the power generation unit 1, in order to automate the increase in vacuum in the condenser 4, the start of boiler ignition preparation may be determined, for example, by outputting a signal to start an ignition diesel pump, etc., and when it is determined that the boiler ignition preparation has started, the vacuum pump 12 may be automatically started to increase the vacuum in the condenser (increase the vacuum).

[0040] Furthermore, although the vacuum is not increased until the power generation unit 1 is ready to be ignited, even if the condensate is below 100°C, the effect of dissolved oxygen is not completely eliminated. Therefore, in order to adjust the amount of dissolved oxygen in the condensate and to prevent corrosion of the thin tubes by pH control, it is effective to make the condensate alkaline (for example, pH 9.5 or higher) by injecting hydrazine into the outlet of the deaerator 16, for example. In this way, by injecting hydrazine into the condensate to adjust the amount of dissolved oxygen and the pH value, it is possible to further prevent corrosion of the thin tubes due to dissolved oxygen, and it is possible to further reduce the risk of thin tube corrosion caused by omitting to increase the vacuum in the condenser 4 before cleaning up the condensate system 5 and the feedwater system 6.

Claims

1. A method for starting up a power generation unit having a steam generator, a steam turbine that rotates using steam generated by the steam generator, a condenser that cools and condenses exhaust steam from the steam turbine to produce condensed water, and a vacuum pump that sucks and discharges non-condensable gases in the condenser, a start-up preparation step of preparing to start the power generation unit; a water quality improvement execution step for executing each process of a water quality improvement process in stages to improve the water quality in the water quality improvement target equipment including the condenser and the steam generator; an ignition step of preparing the boiler for ignition and igniting the boiler, A method for starting a power generating unit, characterized in that the operation of increasing the vacuum of the condenser is reserved in the water quality improvement execution step and is executed in the ignition preparation step of the ignition step.

2. 2. The method for starting a power generating unit according to claim 1, wherein hydrazine is injected into the condensate to make the condensate alkaline.

3. A method for controlling a condenser vacuum degree of a power generating unit, the power generating unit having a steam generator, a steam turbine rotated by steam generated by the steam generator, a condenser that cools and condenses exhaust steam from the steam turbine to produce condensed water, and a vacuum pump that sucks and discharges non-condensable gases in the condenser, comprising: A method for controlling the vacuum degree of a condenser of a power generating unit, comprising the steps of: operating the vacuum pump to start increasing the vacuum in the condenser in preparation for ignition of the boiler.

4. A condenser vacuum control device for a power generation unit that controls the degree of vacuum in the condenser at the start of startup of the power generation unit, the power generation unit having a steam generator, a steam turbine that rotates using steam generated by the steam generator, a condenser that cools and condenses exhaust steam from the steam turbine to produce condensed water, and a vacuum pump that sucks and discharges non-condensable gases in the condenser, an ignition preparation start determination means for determining the start of ignition preparation for the boiler; a vacuum increase starting means for starting a vacuum increase in the condenser by operating the vacuum pump after the ignition preparation start determining means determines that the boiler has started ignition preparation; A condenser vacuum control device for a power generation unit, comprising:

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