JP2737884B2 - Steam turbine generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steam turbine power generator having a steam turbine driven by steam from a boiler, and a generator driven by the steam turbine, and more particularly, to a sudden increase and decrease of an electric load. The present invention relates to a steam turbine power generation device capable of appropriately operating with respect to a steam turbine power generation device.

[0002]

2. Description of the Related Art A steam turbine power generator comprising a steam turbine supplied with steam from a boiler via a main steam system, and a generator for converting power generated by the steam turbine into electric power and supplying the electric power to an electric power load. Is well known in the art.

[0003] When a bleed condensing turbine is used as the steam turbine, the exhaust gas from the steam turbine is cooled and condensed into a steam turbine provided with a high-pressure turbine section and a low-pressure turbine section to form condensate, thereby achieving atmospheric pressure. A condenser for maintaining the following predetermined pressure is provided, and a high-pressure steam control valve (a so-called main steam control valve) is provided at an inlet of the high-pressure turbine unit.
However, a low-pressure steam control valve (so-called,
A bleed control valve) is provided.

[0004] In the steam turbine having the above structure, an amount of steam corresponding to the turbine load is supplied from the boiler to the high-pressure turbine section via the high-pressure steam control valve, and the extracted steam obtained by extracting a part of the exhaust gas of the high-pressure turbine section is It is supposed to be supplied to the extraction system, and the power of the extraction steam is controlled to a predetermined pressure by controlling the pressure of the extraction steam by a low-pressure steam control valve, so that the power is supplied from the generator to the power load. Has been.

[0005] In the case of the steam turbine power generator having the above configuration, when the power load fluctuates, it is necessary to control the power output from the generator in accordance with the power load fluctuation. As disclosed in JP-A-149703, a technique for controlling the high-pressure steam control valve at the inlet of the high-pressure turbine section to adjust the amount of steam supplied to the high-pressure turbine section, thereby responding to power load fluctuations. Has been proposed.

[0006]

As described above, in the case of controlling the amount of steam supplied to the steam turbine by controlling the high-pressure steam control valve, for example, when the power load is suddenly reduced, the high-pressure steam control valve is used. Must be sharply reduced to drastically reduce the amount of steam flowing into the high pressure turbine section at a load change speed that the high pressure turbine section cannot normally tolerate. Then, the temperature change in the high-pressure turbine section increases following the rapidly decreasing steam amount, the thermal stress of the casing and the rotor increases, and the life of the high-pressure turbine section may be shortened. On the other hand, also in the boiler, it is necessary to reduce the amount of generated steam in response to the sudden decrease in the load, and there is a possibility that a problem may occur in which the operation of the boiler exceeds the allowable load reduction speed.

Further, when the power load suddenly increases, the opening of the high-pressure steam control valve must be sharply increased to rapidly increase the amount of steam flowing into the high-pressure turbine at a load change speed which the high-pressure turbine cannot normally tolerate. Must. Then, the temperature change in the high-pressure turbine section increases following the sudden increase in the amount of steam, the thermal stress of the casing and the rotor increases, and the life of the high-pressure turbine section may be shortened. On the other hand, even in boilers, it is necessary to increase the amount of generated steam in response to a sudden increase in load, and not only is it necessary to operate beyond the allowable load increase speed of the boiler, but it is not possible to follow the sudden increase in turbine load. There may be a problem that there is.

[0008] The present invention has been made in view of the above, and when the power load suddenly increases and decreases, without changing the load of the boiler (ie, without changing the amount of steam flowing into the high pressure turbine section), It is an object of the present invention to enable a turbine to be operated at an appropriate load change speed and to make effective use of surplus steam generated when the load suddenly increases or decreases.

[0009]

According to the present invention, as a means for solving the above-mentioned problems, a high-pressure turbine section supplied with steam from a boiler and a low-pressure turbine section supplied with steam via the high-pressure turbine section are provided. , A generator driven by the steam turbine, a medium-pressure extraction system through which extracted steam extracted from the exhaust of the high-pressure turbine section flows, and a high-pressure turbine section provided at an inlet of the high-pressure turbine section. A high-pressure steam control valve for controlling the amount of steam flowing to the high-pressure turbine section, and exhaust gas other than the extracted steam from the high-pressure turbine section for controlling the pressure of the extracted steam supplied from the exhaust of the high-pressure turbine section and supplied to the medium-pressure extraction system. A low-pressure steam control valve provided at the inlet of the flowing low-pressure boiler section; a water supply system for supplying water to the boiler; and a water supply system provided in the water supply system and supplied through the medium-pressure bleeding system. Required for the generator in a steam turbine power generating apparatus including a deaerator for recovering heat of surplus steam to be supplied and a feedwater flow rate regulating valve for controlling a feedwater amount supplied to the deaerator. Power control means for opening and closing the feedwater flow regulating valve and the low-pressure steam control valve at a predetermined speed in accordance with a change in the power load; and the feedwater flow regulating valve and the low pressure when the power load required for the generator suddenly increases or decreases. Open / close speed control means for increasing the open / close speed of the steam control valve is additionally provided.

[0010]

According to the present invention, the following effects can be obtained by the above means: when the power load required for the generator shows a normal change, the high pressure steam control valve and the low pressure steam control by the power control means. The valve is controlled to open and close at a normal speed, but if the power load required by the generator suddenly increases or decreases, the water supply flow control valve is rapidly closed or suddenly controlled by the power control means that receives a command from the opening and closing speed control means. After opening and rapidly decreasing or rapidly increasing the amount of water supplied to the deaerator, the low-pressure steam control valve is rapidly opened or closed to rapidly increase or decrease the amount of steam flowing to the low-pressure turbine section (that is, from the high-pressure turbine section). By rapidly decreasing or rapidly increasing the amount of steam extracted), the power generation capacity of the generator can be made to correspond to the suddenly increased or decreased power load. At this time, even if the amount of steam flowing through the low-pressure turbine section is suddenly increased or decreased, the temperature change is small because the low-pressure turbine section has a lower temperature than the high-pressure turbine section.

In the above control, the amount of water supplied to the deaerator is rapidly reduced or rapidly increased. In response to this, the amount of steam extracted from the high-pressure turbine and supplied to the deaerator is also rapidly reduced or increased. Is supposed to be
The deaerator will work effectively.

[0012]

According to the present invention, a steam turbine comprising a high-pressure turbine section to which steam from a boiler is supplied, a low-pressure turbine section to which steam is supplied via the high-pressure turbine section, and a steam turbine driven by the steam turbine A generator, a medium-pressure bleeding system through which bleed steam extracted from the exhaust of the high-pressure turbine section flows, and provided at an inlet of the high-pressure turbine section,
A high-pressure steam control valve for controlling the amount of steam flowing to the high-pressure turbine section, and other than the extracted steam from the high-pressure turbine section for controlling the pressure of extracted steam supplied from the exhaust of the high-pressure turbine section and supplied to the medium-pressure extraction system. A low-pressure steam control valve provided at the inlet of the low-pressure boiler section through which exhaust gas flows, a water supply system for supplying water to the boiler, and excess steam provided in the water supply system and supplied through the medium-pressure bleeding system In a steam turbine power generating apparatus provided with a deaerator for recovering heat of the air and a water supply flow rate regulating valve for controlling a water supply amount supplied to the deaerator, a change in power load required for the power generator Power control means for opening and closing the feedwater flow control valve and the low-pressure steam control valve at a predetermined speed in response to the control of the feedwater flow control valve and the low-pressure steam control valve when the power load required for the generator suddenly increases or decreases. An opening / closing speed control means for increasing the closing speed is provided, and when the power load required for the generator shows a normal change, the power control means opens and closes the high-pressure steam control valve and the low-pressure steam control valve at a normal speed. However, if the power load required for the generator suddenly increases or decreases, the water supply flow control valve is rapidly closed or rapidly opened by the power control means that receives a command from the opening / closing speed control means, and the deaerator is opened. After rapidly reducing or increasing the amount of water supplied to the low pressure steam control valve, the amount of steam flowing to the low pressure turbine section is rapidly increased or decreased (i.e., the amount of steam extracted from the high pressure turbine section is By suddenly increasing or decreasing)
The power generation capacity of the generator is adapted to the sudden increase or decrease in power load by controlling the amount of steam flowing through the low-pressure turbine section, so even if the amount of steam flowing through the low-pressure turbine section is rapidly increased or decreased, the low-pressure turbine section is Since the temperature is lower than that of the turbine section, the temperature change can be kept small, and there is an excellent effect that it is possible to cope with a sudden change in the power load while ensuring the durability of the steam turbine.

In the above control, the amount of water supplied to the deaerator suddenly increases or decreases. In response, the amount of steam extracted from the high-pressure turbine and supplied to the deaerator also increases or decreases. Therefore, the deaerator works effectively, and there is also an effect that the surplus steam generated at the time of a sudden change in the power load can be effectively used.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a system diagram of a steam turbine power generator according to an embodiment of the present invention.

The steam turbine power generator of this embodiment comprises a boiler 1, a high-pressure turbine section 2a to which steam from the boiler 1 is supplied, and a low-pressure turbine section 2b to which steam is supplied via the high-pressure turbine section 2a. Steam turbine 2
The generator 3 driven by the steam turbine 2 and the exhaust gas of the steam turbine 2 are cooled and condensed by using an appropriate cooling means (not shown) to form condensate water, and the condensate is maintained at a predetermined pressure lower than the atmospheric pressure. A water dispenser 4 is provided.

The boiler 1 is connected to a water supply system 5 for supplying the condensate and make-up water from the condenser 4. The water supply system 5 includes a condensate pump 6, a condensate tank 7, Deaerator water supply pump 8, water supply flow rate regulating valve 9, low pressure water supply heater 10, deaerator 11, deaeration water pump 12, deaeration water tank 1
3 and a boiler feed pump 14 are sequentially provided.

The steam from the boiler 1 is supplied to the main steam system 1
The main steam system 15 is provided with a high-pressure steam control valve 16. The high-pressure steam control valve 16 controls the flow rate of the main steam flowing into the high-pressure turbine unit 2a via the main steam system 15.

A part of the exhaust gas from the high-pressure turbine unit 2a is extracted into the high-pressure turbine unit 2a,
Pressure steam process 18 acting as a heat recovery device
The medium pressure bleeding system 17 for supplying to the air is connected. The high-pressure turbine section 2a is connected to a steam passage 19 that supplies the remaining exhaust gas extracted to the medium-pressure extraction system 17 to the low-pressure turbine section 2b. The steam passage 19 has a low-pressure steam control valve. 20 are interposed. The low-pressure steam control valve 20
Controls the pressure of the extracted steam supplied to the medium-pressure extraction system 17. Reference numeral 21 denotes a pressure relief valve that acts to release steam to the atmosphere in an emergency.

The low-pressure turbine section 2b supplies a low-pressure bleed system 22 that extracts air from the low-pressure turbine section 2b and supplies the low-pressure feedwater heater 10 to the low-pressure turbine section 2b, and supplies exhaust gas from the low-pressure turbine section 2b to the condenser 4. Exhaust system 23 is connected.

A high-pressure bypass system 24 for bypassing the high-pressure turbine unit 2a is connected between the main steam system 15 and the medium-pressure bleeding system 17, and the high-pressure bypass system 24 is connected to the main steam system 15a. A high-pressure regulating valve 25 that is opened when the vapor pressure of the gas becomes equal to or higher than a predetermined pressure is provided.

A low-pressure bypass system 26 for bypassing the low-pressure turbine section 2b is connected between the intermediate-pressure bleed system 17 and the condenser 4, and the low-pressure bypass system 26 is connected to the medium-pressure bleed system. An intermediate pressure regulating valve 27 which is opened when the pressure of the extracted steam of the system 17 becomes equal to or higher than a predetermined pressure is provided.

In the low-pressure feed water heater 10, feed water including condensate from the condenser 4 is heated by bleed steam supplied via the medium-pressure bleed system 17. The drain generated in 10 is returned to the condenser 4 via the drain system 28.

The generator 3 generates electric power corresponding to the amount of work performed by the steam from the boiler 1 flowing to the steam turbine 2, and generates a plant load 30 connected to a plant power system 29.
Is to be supplied with power. Note that a power purchase system 31 for purchasing power is connected to the factory power system 29.

In this embodiment, the set pressure is reduced in the order of the intermediate pressure control valve 27, the pressure relief valve 21, the high pressure steam control valve 16, and the high pressure control valve 25.

In FIG. 1, reference numeral 32 denotes a pressure detector for detecting the steam pressure of the main steam system 15; 33, a pressure detector for detecting the extracted steam pressure of the medium-pressure bleeding system 17;
Reference numeral 4 denotes a rotation speed detector for detecting the rotation speed of the steam turbine 2, and reference numeral 35 denotes a power detector for detecting the purchased power of the power purchase system 31.

The steam turbine power generator having the above configuration receives various information from the pressure detectors 32 and 33, the rotation speed detector 34 and the power detector 35,
A control unit 40 for controlling the opening and closing of the high-pressure steam control valve 16, the low-pressure steam control valve 20, and the high-pressure control valve 25 is provided.

As shown in FIG. 2, the control unit 40 controls the power so as to purchase a predetermined amount of power from the power purchase system 31 in response to a change in the power load required for the generator 3 (ie, APC). Power control means 41 for controlling the opening and closing of the feedwater flow regulating valve 9 and the low-pressure steam control valve 20 to control
Opening / closing speed control means 42 for increasing the opening / closing speed of the feedwater flow regulating valve 9 and the low-pressure steam control valve 20 when the power load required for the generator 3 suddenly increases and decreases, and information from the rotational speed detector 34 (that is, , The high-pressure steam control valve 16 and the low-pressure steam control valve 20.
Control means 43 for controlling the speed of steam turbine 2 by controlling
A load setting unit 44 for setting an electric load, and a high-pressure control unit 45 for opening the high-pressure regulating valve 25 when the steam pressure of the main steam system 15 detected by the pressure detector 32 becomes equal to or higher than a predetermined pressure. Based on the medium pressure control means 46 for opening the medium pressure regulating valve 27 when the bleed steam pressure detected by the pressure detector 33 becomes equal to or higher than a predetermined pressure, and the bleed steam pressure detected by the pressure detector 33. Extraction pressure control means 47 for controlling the low pressure steam control valve 20 to control the pressure of the extraction steam sent to the medium pressure extraction system 17 to a predetermined pressure.
And

The steam turbine generator constructed as described above operates as follows.

First, the steady operation of the power generator will be described.

When steam is supplied from the boiler 1 to the steam turbine 2 via the main steam system 15, a high-pressure steam control valve 16
And a part of the exhaust gas is taken out and supplied to the medium-pressure bleeding system 17.
The remaining exhaust gas flows through the low-pressure steam control valve 20 to the low-pressure turbine unit 2b to perform work.
And is condensed by the condenser 4 and is maintained at a predetermined pressure equal to or lower than the atmospheric pressure. At this time, the non-condensable gas in the condenser 4 is discharged outside by an ejector (not shown).

The generator 3 generates steam from the high-pressure turbine section 2a,
Electric power corresponding to the amount of work that has flowed through the low-pressure turbine section 2b is generated and supplied to the factory load 30, which is an electric power load. At this time, a predetermined amount of power is purchased from the power purchase system 31.

The condensed water condensed in the condenser 4 is condensed in the condenser pump 6 by controlling the hot well water level of the condenser 4 (not shown).
To the condensate tank 7. The condensate tank 7
Is supplied with make-up water corresponding to the steam sent to the medium-pressure steam process 18.

The water supply in which the condensed water and the makeup water are mixed in the condensate tank 7 is boosted in pressure by a deaerator water supply pump 8, sent to a low-pressure water heater 10, and supplied through a low-pressure bleed air system 22. After being heated and heated by the extracted steam, it is sent to the deaerator 11.

In the deaerator 11, a medium pressure bleeding system 17
The supply water is heated and degassed by the extracted steam supplied through the dewatering unit to be deaerated water, and is supplied to the deaerated water tank 13 by the deaerated water pump 12. At this time, when the water level of the deaeration water tank 13 is equal to or higher than a predetermined water level, the water supply amount supplied to the deaerator 11 is set to the minimum flow rate so that the water supply flow rate adjustment valve 9
Is controlled by

The degassed water stored in the degassed water tank 13 is
The pressure is increased by the boiler feed pump 14 and the water is supplied by an amount of water that maintains the drum water level of the boiler 1. Boiler 1
Is turned into steam in the boiler 1 and supplied to the steam turbine 2 as described above.

When the steam pressure of the medium-pressure bleed system 17 changes due to a change in the steam consumption of the medium-pressure steam process 18 or the deaerator 11, the control unit 40 to which the pressure detected by the pressure detector 33 is input. The low pressure steam control valve 20 is controlled to open and close by the operation of the bleed pressure control means 47, and the bleed pressure is maintained at a predetermined pressure.

Further, when the power load of the factory load 30 changes, the power supply control means 41 of the control unit 40 to which the purchased power detected by the power detector 35 is inputted acts on the feed water flow regulating valve 9 and the low pressure steam control. The valve 20 is controlled to open and close, the purchased power is controlled to a predetermined amount (that is, set by the load setting unit 44), and the required power is supplied from the generator 3 to the factory load 30.

In the above case, the steam pressure of the main steam system 15 is
The boiler 1 is operated to a predetermined operating pressure by combustion. At this time, when the steam pressure of the main steam system 15 detected by the high-pressure pressure detector 32 exceeds a predetermined pressure, the high-pressure control valve 25 of the control unit 40 operates to open the high-pressure regulating valve 25, and the high-pressure bypass system Excess steam is released to the medium pressure extraction system 17 via 24.

Next, a case where the power load is sharply reduced will be described.

In this case, the feed water flow control valve 9 and the low-pressure steam control valve are controlled by the power control means 41 according to a command from the opening / closing speed control means 42 of the control unit 40 to which the purchased power detected by the power detector 35 is input. The opening and closing speed of 20 is increased.

That is, when the feedwater flow regulating valve 9 is suddenly opened and the amount of feedwater flowing into the deaerator 11 is rapidly increased, and the amount of extracted steam consumed in the deaerator 11 is increased, the medium pressure extraction system 17 , The steam pressure is lowered. Then, the low-pressure steam control valve 20 is rapidly closed to maintain the bleed pressure,
APC control is performed so that the power purchase amount becomes a predetermined amount (that is,
The power generation capacity of the generator 3 is controlled in a decreasing direction). At this time, if the amount of power purchase becomes equal to or less than the predetermined amount, the low-pressure steam control valve 20 is further narrowed down, and the AP is adjusted so that the amount of power purchase becomes the predetermined amount.
C is controlled.

At this time, when the extraction pressure of the intermediate pressure extraction system 17 rises and exceeds a predetermined pressure, the operation of the intermediate pressure control means 46 of the control unit 40 to which the extraction pressure detected by the pressure detector 33 is inputted. Then, the intermediate pressure adjusting valve 27 is opened, excess steam is released to the condenser 4 via the low pressure bypass system 26, and the extraction pressure of the intermediate pressure extraction system 17 is controlled to a predetermined pressure. Then, the reduction of the electric power load is stopped, and when the load becomes constant, the low-pressure steam control valve 20 is closed and the medium-pressure control valve 27 is closed to control the bleed pressure to a predetermined pressure.

Next, a case where the power load has increased sharply will be described.

Also in this case, the feed water flow control valve 9 and the low-pressure steam control valve are controlled by the power control means 41 according to a command from the opening / closing speed control means 42 of the control unit 40 to which the purchased power detected by the power detector 35 is input. The opening and closing speed of 20 is increased.

That is, when the feedwater flow regulating valve 9 is rapidly closed to reduce the amount of water flowing into the deaerator 11 and the amount of extracted steam consumed in the deaerator 11 is reduced, the medium pressure bleed system 17 Is increased. Therefore, the low-pressure steam control valve 20 is rapidly opened to maintain the bleed pressure,
APC control is performed so that the power purchase amount becomes a predetermined amount (that is,
The power generation capacity of the generator 3 is controlled in the upward direction). At this time, if the amount of purchased electricity is equal to or more than a predetermined amount, the low-pressure steam control valve 20 is further opened, and the AP is controlled so that the amount of purchased electricity becomes the predetermined amount.
C is controlled.

As described above, when the power load required for the generator 3 suddenly increases or decreases, the water supply flow rate regulating valve 9 is rapidly closed or suddenly controlled by the power control means 41 which receives a command from the opening / closing speed control means 42. Opening and suddenly increasing the amount of water supplied to the deaerator 11 and rapidly opening or rapidly closing the low-pressure steam control valve 20 to rapidly increase or decrease the amount of steam flowing to the low-pressure turbine unit 2b (that is, the high-pressure turbine The amount of steam extracted from the section 2a is suddenly decreased or increased), so that the power generation capacity of the generator 3 is made to correspond to the suddenly increased or decreased power load by controlling the amount of steam flowing through the low-pressure turbine section 2b. Even if the amount of steam flowing through the turbine section 2b is rapidly increased or decreased, the low-pressure turbine section 2b has a lower temperature than the high-pressure turbine section 2a, so that the temperature change is kept small. It and will be, while ensuring the durability of the steam turbine 2 can cope with sudden change of the power load.

In the above control, the amount of water supplied to the deaerator 11 suddenly increases and decreases. In response, the amount of steam extracted from the high-pressure turbine unit 2a and supplied to the deaerator 11 also increases and decreases. Deaerator 1
1 effectively acts, and the surplus steam generated at the time of a sudden change in the power load can be effectively used.

If the power load is to be reduced for a long period of time, the water supply flow control valve 9 is rapidly opened to increase the amount of water supplied to the deaerator 11 and the extracted steam consumed in the deaerator 11 is increased. As the amount is increased, the steam pressure of the medium pressure bleed system 17 is decreased. Therefore, the low pressure steam control valve 2
0 is rapidly closed to maintain the bleed pressure, and APC control is performed so that the purchased amount becomes a predetermined amount (that is, the power generation capacity of the generator 3 is controlled in the upward direction). At the same time, the high-pressure steam control valve 16 is closed at a valve closing speed corresponding to the permissible descent speed of the boiler 1, and the boiler evaporation amount is reduced to the boiler equivalent evaporation amount corresponding to the planned power load.

At this time, when the extraction pressure of the intermediate pressure extraction system 17 rises and exceeds a predetermined pressure, the operation of the intermediate pressure control means 46 of the control unit 40 to which the extraction pressure detected by the pressure detector 33 is inputted. Then, the intermediate pressure adjusting valve 27 is opened, excess steam is released to the condenser 4 via the low pressure bypass system 26, and the extraction pressure of the intermediate pressure extraction system 17 is controlled to a predetermined pressure. Then, the reduction of the electric power load is stopped, and when the load becomes constant, the low-pressure steam control valve 20 is closed and the medium-pressure control valve 27 is closed to control the bleed pressure to a predetermined pressure.

Further, a description will be given of a heat storage operation in which the amount of steam generated by the boiler 1 is increased in advance when the load is to be increased from a long-term low-load operation.

In this case, the high-pressure steam control valve 16 is opened at a speed corresponding to the allowable load increase of the boiler 1. At this time, the amount of steam supply to the steam turbine 2 increases and the AP
The C control is activated, the feed water flow control valve 9 is operated in the opening direction, and the low pressure steam control valve 20 is operated in the closing direction. Volume). At this time, if the steam pressure of the medium pressure extraction system 17 exceeds a predetermined pressure, the medium pressure regulating valve 27 is opened, and excess steam is released to the condenser 4. When the steam generation amount of the boiler 1 reaches a predetermined amount, the high-pressure steam control valve 16 is controlled by a normal control method.

Thereafter, when the power load rises, the feedwater flow regulating valve 9 is operated in the closing direction by the APC control, so that the low-pressure steam control valve 20 is operated in the opening direction, and the steam flowing into the low-pressure turbine section 2b is operated. The amount is increased, and the operation is performed in which the purchased amount is a predetermined amount.

By causing the boiler 1 to generate an evaporation amount corresponding to the load amount that is to be increased in advance as described above, the turbine load can be quickly taken when the load increases. Become.

If the power load and the steam load can be rapidly reduced without lowering the load on the boiler 1, the turbine load must be rapidly increased by the same control as described above for the rapid load increase. Becomes possible.

[Brief description of the drawings]

FIG. 1 is a system diagram of a steam turbine power generator according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a control unit in the steam turbine power generator of FIG.

[Explanation of symbols]

1 is a boiler, 2 is a steam turbine, 2a is a high pressure turbine section, 2b is a low pressure turbine section, 3 is a generator, 4 is a condenser,
11 is a deaerator, 15 is a main steam system, 16 is a high-pressure steam control valve, 17 is a medium-pressure bleeding system, 18 is a medium-pressure steam process, 20
Is a low-pressure steam control valve, 30 is a factory load, 31 is a power purchase system,
40 is a control unit, 41 is power control means, 42 is opening / closing speed control means.

Continuation of the front page (72) Inventor Yoshiyuki Fujii 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Inside Mazda Corporation (56) References JP-A-56-27006 (JP, A) JP-A-63-314302 ( JP, A)

Claims (1)

(57) [Claims] A steam turbine comprising: a high-pressure turbine section to which steam from a boiler is supplied; a low-pressure turbine section to which steam is supplied via the high-pressure turbine section; a generator driven by the steam turbine; A medium-pressure extraction system through which extracted steam extracted from the exhaust of the high-pressure turbine section flows; a high-pressure steam control valve provided at an inlet of the high-pressure turbine section to control an amount of steam flowing to the high-pressure turbine section; A low-pressure steam control valve provided at an inlet of a low-pressure boiler section through which exhaust other than the extracted steam from the high-pressure turbine section flows to control the pressure of the extracted steam supplied from the exhaust gas to the medium-pressure extraction system; A water supply system for supplying water to the water supply system, a deaerator for recovering heat of surplus steam supplied through the medium-pressure bleeding system, and supplied to the deaerator. A steam turbine power generator comprising a feedwater flow control valve for controlling a feedwater quantity, wherein the feedwater flow control valve and the low-pressure steam control valve are opened and closed at a predetermined speed in accordance with a change in a power load required for the generator. Power control means for controlling, and opening and closing speed control means for increasing the opening and closing speed of the feedwater flow regulating valve and the low-pressure steam control valve when the power load required for the generator suddenly increases or decreases is provided. Steam turbine generator.