JPH04252807A - Steam turbine power generation plant - Google Patents

Abstract

PURPOSE:To operate a steam turbine with a proper load varying velocity without varying load of a boiler when electric load is abruptly increased or decreased, that is, without varying steam amount which flows into a high pressure turbine. CONSTITUTION:When an electric load required by a generator 3 is abruptly increased, a feed water control valve 9 is abruptly closed or opened by means of an electric control means 41 based on a command of an opening/closing speed control means 42, to abruptly decrease or increase a feed water amount to be fed to a deaerator 11. In addition, a low pressure governing valve 20 is abruptly opened or closed to abruptly increase or decrease steam amount flowing into a low pressure turbine part 2b, that is, steam amount extracted from a high pressure turbine part 2a is abruptly decreased or increased. Generating ability is thereby set correspondently to an electric load abruptly increased or decreased.

Description

[Detailed description of the invention]

0001

[Industrial Field of Application] The present invention relates to a steam turbine power generation device equipped with a steam turbine driven by steam from a boiler and a generator driven by the steam turbine, and more specifically to a rapid reduction in electric power load. This invention relates to a steam turbine power generation system that can be operated appropriately.

0002

[Prior Art] A steam turbine power generation system equipped with a steam turbine to which steam from a boiler is supplied via a main steam system, and a generator that converts the power generated by the steam turbine into electric power and supplies it to an electric load. has been well known for a long time.

[0003] When an extraction condensation turbine is used as the steam turbine, the exhaust gas from the steam turbine is cooled and condensed in a steam turbine equipped with a high-pressure turbine section and a low-pressure turbine section, and is converted into condensate and reduced to atmospheric pressure. A condenser is attached to maintain the pressure at the following predetermined pressure, and a high-pressure steam control valve (so-called main steam control valve) is installed at the inlet of the high-pressure turbine section.
However, there is a low pressure steam control valve (so-called,
A bleed air adjustment valve) is provided.

In the steam turbine configured as described above, steam in an amount 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 from the high-pressure turbine section is The pressure of the extracted steam is controlled by a low-pressure steam regulating valve to control the extracted steam pressure to a predetermined pressure, and power is supplied from the generator to the electric power load. is being used.

[0005] In the case of a steam turbine power generator having the above configuration, when a fluctuation occurs in the power load, it is necessary to control the power output from the generator in response to the power load fluctuation. As disclosed in Japanese Patent Application No. 149703, a technology that adjusts the amount of steam supplied to the high-pressure turbine section by controlling a high-pressure steam control valve at the inlet of the high-pressure turbine section, thereby responding to power load fluctuations. is proposed.

[0006]

[Problems to be Solved by the Invention] As mentioned above, in the case of a system in which the amount of steam supplied to the steam turbine is controlled by controlling the high-pressure steam regulating valve, for example, when the power load suddenly decreases, the high-pressure steam regulating valve The amount of steam flowing into the high-pressure turbine section must be rapidly reduced by rapidly reducing the opening degree of the high-pressure turbine section at a load change rate that the high-pressure turbine section cannot normally tolerate. As a result, the temperature change in the high-pressure turbine section increases as the amount of steam rapidly decreases, increasing thermal stress on the casing and rotor, which may shorten the life of the high-pressure turbine section. On the other hand, in the boiler as well, it becomes necessary to reduce the amount of steam generated in response to a sudden load drop, and there is a risk that the boiler will be forced to operate at a rate exceeding the allowable load drop rate.

[0007] Furthermore, when the power load suddenly increases, the opening degree of the high-pressure steam control valve must be suddenly increased to rapidly increase the amount of steam flowing into the high-pressure turbine section at a load change rate that the high-pressure turbine section cannot normally tolerate. Must be. Then, following the rapidly increasing amount of steam, the temperature change in the high-pressure turbine section increases, increasing thermal stress on the casing and rotor, and there is a risk that the life of the high-pressure turbine section will be shortened. On the other hand, boilers also need to increase the amount of steam generated in response to a sudden increase in load, which not only forces the boiler to operate at a speed that exceeds the allowable load increase rate, but also may not be able to keep up with the sudden increase in turbine load. There is a possibility that a problem may arise.

The present invention has been made in view of the above points, and is capable of generating steam without changing the load on the boiler (that is, without changing the amount of steam flowing into the high-pressure turbine section) when the power load suddenly decreases. The purpose is to enable the turbine to operate at an appropriate load change rate and to effectively utilize surplus steam generated when the load suddenly increases or decreases.

[0009]

[Means for Solving the Problems] In the present invention, as a means for solving the above problems, there is provided a high-pressure turbine section to which steam from a boiler is supplied, and a low-pressure turbine section to which steam is supplied via the high-pressure turbine section. a generator driven by the steam turbine; an intermediate-pressure extraction system through which extracted steam extracted from the exhaust gas of the high-pressure turbine section flows; a high-pressure steam control valve for controlling the amount of steam flowing into the high-pressure turbine section; A low-pressure steam control valve provided at the inlet of the low-pressure boiler section, a water supply system for supplying water to the boiler, and a water supply system installed in the water supply system to absorb the heat of surplus steam supplied via the medium-pressure extraction system. In a steam turbine power generation device equipped with a deaerator for recovery and a water supply flow rate adjustment valve that controls the amount of water supplied to the deaerator, the power generator is configured to A power control means for controlling the opening and closing of the water supply flow rate adjustment valve and the low pressure steam adjustment valve at a predetermined speed; It is equipped with an opening/closing speed control means for increasing the opening/closing speed.

0010

[Function] In the present invention, the following effects are obtained by the above means. That is, when the power load required for the generator shows a normal change, the power control means controls the high-pressure steam control valve and the low-pressure steam control valve. The valve is controlled to open and close at a normal speed, but if the power load required for the generator suddenly decreases, the power control means receives a command from the opening/closing speed control means to close or suddenly close the water supply flow rate regulating valve. After opening the valve to suddenly reduce or increase the amount of water supplied to the deaerator, the low-pressure steam control valve is suddenly opened or closed to suddenly reduce or reduce the amount of steam flowing to the low-pressure turbine section (i.e., the amount of water flowing from the high-pressure turbine section to By rapidly reducing or rapidly increasing the amount of steam extracted, the power generation capacity of the generator can be adapted to the rapidly reduced power load. At this time, even if the amount of steam flowing into the low-pressure turbine section is rapidly reduced, the temperature change will be small because the low-pressure turbine section is lower in temperature than the high-pressure turbine section.

[0011] Furthermore, in the above control, the amount of water supplied to the deaerator suddenly decreases or increases rapidly, but correspondingly, the amount of extracted steam extracted from the high pressure turbine section and supplied to the deaerator also decreases or rapidly increases. Because it is supposed to be
The deaerator will work effectively.

0012

According to the present invention, there is provided a steam turbine including a high-pressure turbine section to which steam from a boiler is supplied and 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. an intermediate-pressure extraction system through which extracted steam extracted from the exhaust gas of the high-pressure turbine section flows, and an inlet of the high-pressure turbine section,
A high-pressure steam control valve that controls the amount of steam flowing to the high-pressure turbine section, and a high-pressure steam control valve that controls the pressure of the extracted steam extracted from the exhaust gas of the high-pressure turbine section and supplied to the intermediate-pressure extraction system, other than the extracted steam from the high-pressure turbine section. a low-pressure steam regulating valve provided at the inlet of the low-pressure boiler section through which the exhaust gas flows; a water supply system for supplying water to the boiler; and surplus steam provided in the water supply system and supplied via the medium-pressure extraction system. In a steam turbine power generation device equipped with a deaerator for recovering the heat of the deaerator and a water supply flow rate adjustment valve that controls the amount of water supplied to the deaerator, a change in the power load required for the generator power control means for controlling the opening and closing of the water supply flow rate adjustment valve and the low pressure steam control valve at a predetermined speed in response to a sudden decrease in the power load required for the generator; The high-pressure steam regulating valve and the low-pressure steam regulating valve are opened and closed at the normal speed by the power control means when the power load required for the generator shows a normal change. However, if the power load required for the generator suddenly decreases, the power control means receives a command from the opening/closing speed control means to quickly close or open the water supply flow rate regulating valve to shut down the deaerator. After suddenly decreasing or rapidly increasing the amount of water supplied to the high-pressure turbine section, the low-pressure steam control valve is suddenly opened or closed to suddenly reduce or suddenly reduce the amount of steam flowing to the low-pressure turbine section (in other words, the amount of steam extracted from the high-pressure turbine section is suddenly reduced or decreased). By causing a sudden decrease or rapid increase in
Since the power generation capacity of the generator is made to respond to the sharply reduced power load by controlling the amount of steam flowing to the low-pressure turbine section, even if the amount of steam flowing to the low-pressure turbine section is suddenly or suddenly reduced, the low-pressure turbine section will still maintain high pressure. Since the temperature is lower than that of the turbine section, temperature changes can be suppressed to a small extent, which has the excellent effect of being able to cope with sudden changes in power load while ensuring the durability of the steam turbine.

[0013] Furthermore, in the above control, the amount of water supplied to the deaerator is rapidly reduced, but correspondingly, the amount of extracted steam extracted from the high-pressure turbine section and supplied to the deaerator is also rapidly reduced. Therefore, the deaerator works effectively, and there is also the effect that surplus steam generated when the power load suddenly changes can be used effectively.

[0014]

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

FIG. 1 shows 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 includes 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. A steam turbine 2, a generator 3 driven by the steam turbine 2, and an exhaust gas from the steam turbine 2 are cooled and condensed to condensate using an appropriate cooling means (not shown), and the It is equipped with a condenser 4 that maintains a predetermined pressure.

A water supply system 5 that supplies condensate from the condenser 4 and make-up water is connected to the boiler 1, and the water supply system 5 includes a condensate pump 6, a condensate tank 7, Deaerator feed water pump 8, feed water flow rate adjustment valve 9, low pressure feed water heater 1
0, deaerator 11, deaerator water pump 12, deaerator water tank 13
and a boiler feed pump 14 are successively installed.

Steam from the boiler 1 is transferred to the main steam system 1
5 to the high-pressure turbine section 2a of the steam turbine 2, and 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 main steam flowing into the high pressure turbine section 2a via the main steam system 15.

A part of the exhaust gas from the high-pressure turbine section 2a is extracted into the high-pressure turbine section 2a, and the deaerator 11
and a medium pressure steam process 18 acting as a heat recovery device.
A medium-pressure extraction system 17 is connected thereto. Furthermore, a steam passage 19 is connected to the high-pressure turbine part 2a, and a steam passage 19 is connected to supply the remaining exhaust gas extracted to the intermediate-pressure extraction system 17 to the low-pressure turbine part 2b. 20 are interposed. The low pressure steam control valve 20
controls the pressure of the extracted steam supplied to the intermediate pressure extraction system 17. Reference numeral 21 is a pressure relief valve which acts to release steam to the atmosphere in an emergency.

The low-pressure turbine section 2b includes a low-pressure extraction system 22 that extracts air from the low-pressure turbine section 2b and supplies it to the low-pressure feed water heater 10, and a low-pressure extraction system 22 that supplies exhaust gas from the low-pressure turbine section 2b to the condenser 4. An exhaust system 23 is connected thereto.

A high-pressure bypass system 24 that bypasses the high-pressure turbine section 2a is connected between the main steam system 15 and the intermediate-pressure extraction system 17. A high-pressure pressure regulating valve 25 is provided which is opened when the steam pressure of the steam reaches a predetermined pressure or higher.

[0022] A low-pressure bypass system 26 that bypasses the low-pressure turbine section 2b is connected between the intermediate-pressure extraction system 17 and the condenser 4, and the low-pressure bypass system 26 includes:
An intermediate pressure regulating valve 27 is provided which is opened when the pressure of the extracted steam in the intermediate pressure extraction system 17 exceeds a predetermined pressure.

In the low-pressure feedwater heater 10, the feedwater containing condensate from the condenser 4 is heated by bleed steam supplied via the medium-pressure bleed system 17, and the low-pressure feedwater heater 10 The condensate produced in 10 is returned to condenser 4 via drain system 28 .

The generator 3 generates electric power corresponding to the amount of work performed when steam from the boiler 1 flows to the steam turbine 2, and generates electric power corresponding to the amount of work done by the steam from the boiler 1, and connects the factory load 30 to the factory power system 29.
It is planned to supply electricity to the Note that a power purchasing system 31 for purchasing power is connected to the factory power system 29.

In this embodiment, the set pressures of the intermediate pressure regulating valve 27, the pressure relief valve 21, the high pressure steam regulating valve 16, and the high pressure regulating valve 25 are made smaller in this order.

In FIG. 1, reference numeral 32 is a pressure detector for detecting the steam pressure of the main steam system 15; 33 is a pressure detector for detecting the extracted steam pressure of the intermediate pressure extraction system 17;
4 is a rotational speed detector for detecting the rotational speed of the steam turbine 2, and 35 is a power detector for detecting the purchased power of the power purchasing system 31.

In the steam turbine power generating apparatus having the above configuration, various information is obtained from the pressure detectors 32, 33, the rotation speed detector 34 and the power detector 35, and the water supply flow rate regulating valve 9,
A control unit 40 is attached that controls the opening and closing of the high-pressure steam regulating valve 16, the low-pressure steam regulating valve 20, and the high-pressure pressure regulating valve 25.

As shown in FIG. 2, the control unit 40 controls the power so as to purchase a predetermined amount of power from the power purchasing system 31 in response to changes in the power load required of the generator 3 (that is, APC power control means 41 for controlling the opening and closing of the water supply flow rate adjustment valve 9 and the low pressure steam control valve 20 in order to an opening/closing speed control means 42 that increases the opening/closing speed of the regulator valve 20; and the high-pressure steam regulator 16 and the low-pressure steam regulator 20 according to information from the rotation speed detector 34 (i.e., the rotation speed of the steam turbine 2).
a speed governor 43 that controls the speed of the steam turbine 2, a load setting device 44 that sets the electric power load, and a pressure detector 3.
2, the high pressure control means 45 opens the high pressure regulating valve 25 when the steam pressure in the main steam system 15 detected by the pressure detector 33 exceeds a predetermined pressure; an intermediate pressure control means 46 that opens the intermediate pressure regulating valve 27 when
3, the bleed pressure control means 47 controls the low pressure steam control valve 20 to control the pressure of the bleed steam sent to the intermediate pressure bleed system 17 to a predetermined pressure based on the bleed steam pressure detected by 3.

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

First, the steady operation of this power generator will be explained.

When steam is supplied from the boiler 1 to the steam turbine 2 via the main steam system 15, the high pressure steam control valve 16
The exhaust gas flows into the high-pressure turbine section 2a to do work, and a portion of the exhaust gas is taken out and supplied to the intermediate-pressure extraction system 17. The remaining exhaust gas passes through the low pressure steam control valve 20 and flows to the low pressure turbine section 2b to do work, and the exhaust gas flows through the exhaust system 23.
The water is led to the condenser 4 through the condenser 4, where it becomes condensate and is maintained at a predetermined pressure below atmospheric pressure. At this time, the non-condensable gas in the condenser 4 is discharged to the outside by an ejector (not shown).

[0032] In the generator 3, steam is supplied to a high pressure turbine section 2a,
Electric power corresponding to the amount of work flowing 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 purchasing system 31.

The condensate condensed in the condenser 4 is pumped to the condensate pump 6 by hot well water level control of the condenser 4 (not shown).
The water is sent to the condensate tank 7 by In addition, condensate tank 7
is supplied with make-up water commensurate with the steam supplied to the medium pressure steam process 18.

The feed water in which condensate and make-up water are mixed in the condensate tank 7 is boosted in pressure by the deaerator feed water pump 8 and sent to the low pressure feed water heater 10, where it is supplied via the low pressure extraction system 22. After being heated and heated by extraction steam, it is sent to a deaerator 11.

In the deaerator 11, a medium pressure extraction system 17
The supplied water is heated and degassed by the bleed steam supplied through the degassed water pump 12 to become degassed water, and the degassed water pump 12 sends the water to the degassed water tank 13 . At this time, the amount of water supplied to the deaerator 11 is controlled by the water supply flow rate adjustment valve 9 so that the water level in the deaerated water tank 13 becomes the minimum flow rate when the water level is higher than the predetermined water level.
Controlled by

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

By the way, when the steam pressure in the intermediate pressure extraction system 17 changes due to changes in the steam consumption of the intermediate pressure steam process 18 or the deaerator 11, the control unit 40 receives the pressure detected by the pressure detector 33. The opening and closing of the low pressure steam control valve 20 is controlled by the action of the bleed pressure control means 47, and the bleed pressure is maintained at a predetermined pressure.

Furthermore, when the power load of the factory load 30 changes, the power control means 41 of the control unit 40 to which the purchased power detected by the power detector 35 is input controls the water supply flow rate 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 device 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 achieve 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 regulating valve 25 is operated to open by the action of the high pressure control means 45 of the control unit 40, and the high pressure bypass system Excess steam is vented to the medium pressure extraction system 17 via 24.

Next, a case where the power load suddenly decreases will be explained.

In this case, the power control means 41 controls the water supply flow rate adjustment valve 9 and the low pressure steam control valve in response 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/closing speed of 20 is increased.

That is, when the water supply flow rate regulating valve 9 is suddenly opened and the amount of water supplied to 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 steam pressure is reduced. Therefore, the low pressure steam control valve 20 is suddenly closed to maintain the bleed pressure.
APC control is performed so that the amount of electricity purchased is a predetermined amount (i.e.,
(The power generation capacity of the generator 3 is controlled to decrease). At this time, if the amount of electricity purchased is less than a predetermined amount, the low pressure steam control valve 20 is further throttled and the APC is adjusted so that the amount of electricity purchased becomes the predetermined amount.
controlled.

At this time, when the bleed pressure in the medium pressure bleed system 17 increases and exceeds a predetermined pressure, the medium pressure control means 46 of the control unit 40 receives the bleed pressure detected by the pressure detector 33. , the intermediate pressure regulating 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, when the electric power load stops decreasing and becomes a constant load, the low pressure steam control valve 20 stops closing, the intermediate pressure control valve 27 is operated to close, and the extraction pressure is controlled to a predetermined pressure.

Next, a case where the power load suddenly increases will be explained.

In this case as well, the power control means 41 controls the water supply flow rate adjustment valve 9 and the low pressure steam control valve in response to commands 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/closing speed of 20 is increased.

That is, when the water supply flow rate regulating valve 9 is suddenly closed and the amount of water supply flowing into the deaerator 11 is suddenly reduced, and the amount of extracted steam consumed in the deaerator 11 is reduced, the medium pressure extraction system 17 steam pressure is increased. Therefore, the low pressure steam control valve 20 is suddenly opened to maintain the bleed pressure.
APC control is performed so that the amount of electricity purchased is a predetermined amount (i.e.,
(The power generation capacity of the generator 3 is controlled in an upward direction). At this time, if the amount of electricity purchased exceeds a predetermined amount, the low pressure steam control valve 20 is further opened and the APC is adjusted so that the amount of electricity purchased becomes the predetermined amount.
controlled.

As described above, when the power load required for the generator 3 suddenly decreases, the power control means 41 receives a command from the opening/closing speed control means 42 to close or suddenly close the water supply flow rate regulating valve 9. The amount of water supplied to the deaerator 11 is suddenly reduced or increased rapidly by opening, and the low-pressure steam control valve 20 is suddenly opened or closed to rapidly reduce or reduce the amount of steam flowing to the low-pressure turbine section 2b (i.e., the amount of water supplied to the high-pressure turbine section 2b is suddenly decreased or decreased). By rapidly decreasing or rapidly increasing the amount of steam extracted from the low pressure turbine section 2a, the generation capacity of the generator 3 can be adjusted to the rapidly reduced power load by controlling the amount of steam flowing to the low pressure turbine section 2b. Even if the amount of steam flowing into the turbine section 2b is suddenly or suddenly reduced, the low pressure turbine section 2b is at a lower temperature than the high pressure turbine section 2a, so the temperature change is kept small, and the durability of the steam turbine 2 is ensured. It is possible to cope with sudden changes in power load while

Further, in the above control, the amount of water supplied to the deaerator 11 decreases rapidly, but correspondingly, the amount of extracted steam extracted from the high-pressure turbine section 2a and supplied to the deaerator 11 also decreases rapidly. Deaerator 1
1 will work effectively, and the surplus steam generated when the power load suddenly changes can be used effectively.

When power load reduction is planned for a long period of time, the water supply flow rate adjustment valve 9 is suddenly opened, and the amount of water supply flowing into the deaerator 11 is rapidly increased, and the extracted steam consumed in the deaerator 11 is increased. When the amount is increased, the steam pressure in the medium pressure extraction system 17 is reduced. Therefore, the low pressure steam control valve 2
0 is suddenly closed to maintain the bleed pressure, and APC control is performed so that the amount of electricity purchased becomes a predetermined amount (that is, the power generation capacity of the generator 3 is controlled in an upward direction). At the same time, the high-pressure steam control valve 16 is closed at a valve closing speed corresponding to the allowable lowering speed of the boiler 1, and the boiler evaporation amount is reduced to the boiler-equivalent evaporation amount that matches the planned power load.

At this time, when the bleed pressure in the medium pressure bleed system 17 increases and exceeds a predetermined pressure, the medium pressure control means 46 of the control unit 40 to which the bleed pressure detected by the pressure detector 33 is input is activated. , the intermediate pressure regulating 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, when the electric power load stops decreasing and becomes a constant load, the low pressure steam control valve 20 stops closing, the intermediate pressure control valve 27 is operated to close, and the extraction pressure is controlled to a predetermined pressure.

Furthermore, a heat storage operation in which the amount of steam generated by the boiler 1 is increased in advance when an increase in load is scheduled from a long-term low-load operation will be explained.

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 supplied to the steam turbine 2 increases, and the AP
C control operates, the water supply flow rate adjustment valve 9 operates in the opening direction, and the low pressure steam control valve 20 operates in the closing direction, keeping the amount of electricity purchased constant while increasing the amount of steam supplied to the steam turbine 2 (i.e., the amount of steam generated by the boiler 1). amount). At this time, if the steam pressure in the intermediate pressure extraction system 17 exceeds a predetermined pressure, the intermediate pressure regulating valve 27 is opened and excess steam is released to the condenser 4. When the amount of steam generated by 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 increases, the feed water flow rate regulating valve 9 is operated in the closing direction by APC control, and the low pressure steam regulating valve 20 is operated in the opening direction, thereby reducing the amount of steam flowing into the low pressure turbine section 2b. The amount of electricity will be increased, and the operation will be performed with the amount of electricity purchased at a predetermined amount.

[0054] By causing the boiler 1 to generate in advance the amount of evaporation corresponding to the amount of load that is scheduled to increase as described above, it is possible to rapidly increase the turbine load when the load increases. Become.

[0055] Furthermore, if it is possible to cope with a sudden decrease in the electric power load and steam load without reducing the load on the boiler 1, the turbine load can be rapidly reduced using the same control as described above in response to a sudden increase in load. becomes possible.

[Brief explanation of the drawing]

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

FIG. 2 is a block diagram showing the configuration of a control unit in the steam turbine power generator of FIG. 1.

[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 an intermediate pressure extraction system, 18 is an intermediate pressure steam process, 20 is a low pressure steam control valve, 30 is a factory load, 31 is a power purchase system ,4
0 is a control unit, 41 is a power control means, and 42 is an opening/closing speed control means.

Claims (1)

[Claims] 1. A steam turbine comprising a high-pressure turbine section to which steam from a boiler is supplied and a low-pressure turbine section to which steam is supplied via the high-pressure turbine section; a generator driven by the steam turbine; an intermediate-pressure extraction system through which extracted steam extracted from the exhaust gas of the high-pressure turbine section flows; a high-pressure steam control valve provided at the inlet of the high-pressure turbine section to control the amount of steam flowing to the high-pressure turbine section; a low-pressure steam regulating valve provided at an inlet of a low-pressure boiler section through which exhaust gas other than the extracted steam from the high-pressure turbine section flows in order to control the pressure of extracted steam extracted from the exhaust gas and supplied to the intermediate-pressure extraction system; a water supply system for supplying water to the water supply system; a deaerator provided in the water supply system for recovering heat of excess steam supplied via the medium pressure extraction system;
A steam turbine power generation device equipped with a water supply flow rate adjustment valve that controls the amount of water supplied to the deaerator, the supply water flow rate adjustment valve and the low pressure being adjusted according to changes in the power load required of the generator. A power control means for controlling the opening and closing of the steam regulating valve at a predetermined speed, and an opening/closing speed control means for increasing the opening and closing speed of the water supply flow rate regulating valve and the low pressure steam regulating valve when the electric power load required for the generator is suddenly reduced. A steam turbine power generation device characterized by being attached.