JP2007255389A - Auxiliary steam supply device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an auxiliary steam supply device capable of efficiently supply one series of auxiliary steam to an outdoor facility by attaching a pressure/temperature detection part to the outlet of each temperature reducer to automatically operating the temperature reducer of each series and controlling a temperature-reduced water pump according to the detected results of the pressure or temperature of the auxiliary steam. <P>SOLUTION: The No. 1 series of this auxiliary steam supply device 100 comprises a communication valve 3 for converging a steam supplied from a main steam pipe 23 to a steam supplied from a main steam pipe 24, a pressure regulating valve 2 for reducing the pressure of the steam supplied from the main steam pipe 23, a supply valve 4 for passing or stopping the depressurized steam, the temperature reducer 5 for lowering the temperature of the depressurized steam, the temperature-reduced water pump 7 for supplying a cooling water 26 to the temperature reducer 5, the pressure/temperature detection parts 8 for detecting the pressures and temperatures at the outlets of the temperature reducers 5, and a control part 22 for controlling the communication valve 3, the supply valve 4, and the temperature-reduced water pump 7. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an auxiliary steam supply device, and more particularly to an auxiliary steam supply device that stably supplies auxiliary steam to outdoor facilities from a combined facility of a power plant having a plurality of series.

In recent power plants, combined cycle power generation that combines a gas turbine and a steam turbine has become the mainstream instead of hydroelectric power generation. In this combined cycle power generation, gas is generated by burning fuel in compressed air, and gas turbine power is generated by using the expansion force to rotate the generator. By combining steam power generation that turns, the thermal efficiency can be increased to about 40% or more. Further, combined cycle power generation is characterized in that one large-capacity power generation facility is configured by combining a plurality of relatively small-capacity generators, and each power generation facility is called a shaft. A plurality of shafts constitute one series of combined facilities, and a plurality of these series exist to constitute the entire power plant.
Each series also has a high-pressure steam drum that generates high-pressure steam for rotating the steam turbine, and a main steam pipe for supplying the high-pressure steam generated by the high-pressure steam drum to the steam turbine and the boiler in the power plant is stretched around. ing. Further, a part of the high-pressure steam can be reduced in pressure and reduced in temperature and supplied to outdoor equipment.

  FIG. 4 is a diagram illustrating a configuration example of a conventional outdoor facility auxiliary steam supply apparatus. The outdoor facility auxiliary steam supply device 200 includes a No. 1 series combined facility 30 having a main steam pipe, a pressure adjusting valve 31 for reducing the pressure of the main steam pipe, and a supply valve 32 for passing or blocking the reduced steam. A temperature reducing device 33 for reducing the temperature of the supplied steam, a temperature reducing water pump 35 for supplying cooling water to the temperature reducing device 33, and a supply for passing or blocking the cooling water supplied from the temperature reducing water pump 35. The auxiliary steam of No. 1 series is supplied to the outdoor facility 41. The outdoor equipment 41 includes a pure water device 42 used for a vacuum steam ejector for deaeration, a return gas blower 43 used for humidifying the lubricating oil tank, an ammonia vaporization equipment 44 for vaporizing liquefied ammonia with steam, and an LNG And an LNG sampling vaporizer 45 that vaporizes for sampling at the time of acceptance. In the second series, auxiliary steam is individually supplied to the outdoor facility 46 with the same configuration as the first series.

In addition, as a conventional example related to the auxiliary steam system, in Patent Document 1, the generated steam of its own shaft is used as the first steam source, and the extraction of the steam turbine of each shaft constituting the series is used as the second steam source. Steam is introduced from the steam source to the first auxiliary steam mother pipe provided on each shaft constituting the series via the pressure control device and the auxiliary steam supply source valve, and the auxiliary steam usage destination of each axis is provided from this mother pipe. Steam is supplied to the second auxiliary steam mother pipe provided for the system from the second steam source of each shaft constituting the system through the auxiliary steam stop valve. An auxiliary steam system is disclosed which supplies steam from the mother pipe to a first auxiliary steam mother pipe provided on each shaft via a pressure control device and an auxiliary steam supply source valve.
JP-A-5-312008

Since the conventional outdoor auxiliary steam equipment is configured to supply steam individually from each series, it is necessary to operate a plurality of temperature-reducing water pumps for reducing the temperature of the high-pressure steam. However, since a small amount of high-pressure steam is supplied to the auxiliary steam facility, it is possible to cover it with one line of high-pressure steam, and it is not necessary to operate multiple temperature-reducing water pumps. As a result, power wasted.
Further, the conventional technique disclosed in Patent Document 1 requires various operations to control the auxiliary steam system that supplies steam via the pressure control device and the auxiliary steam supply source valve. There is a risk that it will become complicated and cause incorrect operation.

  In view of such problems, the present invention is provided with a pressure / temperature detection unit at the outlet of each temperature reducer in order to automatically operate each series of temperature reducers, and the detection result of the pressure or temperature of auxiliary steam. It is an object of the present invention to provide an auxiliary steam supply device that efficiently controls a series of auxiliary steam to an outdoor facility so as to control a temperature-reduced water pump.

  In order to solve such a problem, the present invention takes out steam from a main steam pipe provided in each of a plurality of series combined facilities, and generates auxiliary steam by depressurizing and reducing the steam, An auxiliary steam supply device for supplying auxiliary steam to an equipment through an auxiliary steam pipe, at least one communication valve for joining the steam supplied from the main steam pipes of each series, and the main steam pipe of each series Pressure reducing means for individually reducing the pressure of the steam supplied from the above, a supply valve for passing or stopping the reduced pressure steam reduced by the pressure reducing means, and a temperature reduction for reducing the temperature of the reduced pressure steam passing through the supply valve , A temperature reducing water pump for supplying cooling water to the temperature reducer, pressure / temperature detection means for detecting pressure and temperature at the outlet of the temperature reducer, and pressure detected by the pressure / temperature detection means Or on temperature Zui and the contact valve, characterized by comprising a control means for controlling the supply valve and reduced hot water pump.

  A feature of the present invention is that a plurality of main steam pipes communicate with each other, and each system has pressure reducing means for reducing pressure and a temperature reducer for reducing temperature, and the pressure and temperature at the outlet of each temperature reducer are monitored. Based on the above, it determines which series of auxiliary steam pipes are effective. Therefore, for example, when there are two series of auxiliary steam pipes, auxiliary steam is always supplied to the equipment through one series of auxiliary steam pipes, and the other series is stopped. When one of the systems breaks down, a duplex system can be configured that automatically switches to the other system and continues operation.

According to a second aspect of the present invention, the control unit merges the steam supplied from the main steam pipes by opening the communication valve, and generates at least one series of steams from the steam supplied from the main steam pipes. The supply valve and the temperature-reduced water pump are controlled so as to generate auxiliary steam by depressurization and temperature reduction, and supply the auxiliary steam to the facility.
As a normal operation of the present invention, only one of a plurality of sequences is operated, and the other sequences are stopped at that time to minimize wasteful power consumption.

According to a third aspect of the present invention, the control means detects that the pressure at the outlet of the desuperheater is within a predetermined pressure range by the pressure / temperature detection means, and the temperature at the outlet of the desuperheater is When it is detected that the temperature is within a predetermined temperature range, the supply valve and the temperature-decreasing water pump are controlled so as to supply the auxiliary steam output from the current operating temperature reducer to the facility. To do.
The present invention assumes that the operation is normal while the pressure / temperature detection means detects normal pressure and temperature, and supplies auxiliary steam output from the currently operating desuperheater to the facility. Like that.

According to a fourth aspect of the present invention, the control means detects that the pressure at the outlet of the desuperheater exceeds a predetermined pressure range by the pressure / temperature detection means, or the temperature at the outlet of the desuperheater. Is detected to exceed the predetermined temperature range, an alarm is generated, the supply of the auxiliary steam output from the currently operating desuperheater to the facility is stopped, and another series of The temperature reducing water pump is driven, and the supply valve and the temperature reducing water pump are controlled so as to supply the auxiliary steam output from the temperature reducing device reduced in temperature by the temperature reducing water pump to the facility. .
When the pressure / temperature detecting means of the present invention detects that the pressure at the outlet of the desuperheater is abnormal, it is considered that the pressure of the main steam pipe itself has become abnormal or the pressure reducing means has failed. . Further, when it is detected that the temperature at the outlet of the temperature reducer is abnormal, it can be assumed that the temperature reducer has failed or that the temperature reducing water pump has failed. When such a situation occurs, an alarm is generated, the currently operating desuperheater is stopped, the other series of desuperheaters are operated, and the auxiliary steam is supplied to the equipment.

According to a fifth aspect of the present invention, the control means joins the steam supplied from the main steam pipes by opening the communication valve, and depressurizes and reduces the temperature of the steam supplied from the main steam pipes. The supply valve and the temperature-reducing water pump are controlled so as to generate auxiliary steam and supply the auxiliary steam to the facility.
As another configuration of the present invention, the steam in the main steam pipe is joined, and the steam from each series is decompressed and reduced, and the auxiliary steam is supplied to the auxiliary steam pipe in parallel. This configuration supplies steam to all of the main steam pipe and the auxiliary steam pipe, and always supplies auxiliary steam to the equipment in parallel.

According to a sixth aspect of the present invention, the control means diverts the steam supplied from the main steam pipes by closing the communication valve, and depressurizes and reduces the temperature of the steam supplied from the main steam pipes. The supply valve and the temperature-reducing water pump are controlled so as to generate auxiliary steam and supply the auxiliary steam to the facility.
As another configuration of the present invention, the communication valve is closed so that the steam in the main steam pipe is not merged, and the steam from each series is decompressed and reduced, and the auxiliary steam is supplied to the auxiliary steam pipe in parallel. In this configuration, the steam is supplied to all of the main steam pipe and the auxiliary steam pipe, but the auxiliary steam is generated from the independent main steam pipe, and the auxiliary steam is always supplied to the facility in parallel.

A seventh aspect of the present invention is characterized in that the combined facility is configured by a power generation method in which gas turbine power generation and steam turbine power generation are combined.
A combined facility in a power plant uses a combination of a gas turbine and a steam turbine on one shaft as power to rotate the generator. And the residual heat of a gas turbine is used effectively, steam is generated and used as the power of a steam turbine.

In the eighth aspect of the present invention, when the pressure or temperature of the auxiliary steam output from the temperature reducers of all the series does not satisfy a predetermined value, the control means generates an alarm and outputs all of the supply valves. It is characterized by closing.
When the pressure or temperature of the auxiliary steam in all series does not satisfy the predetermined value, it is assumed that a large abnormality has occurred, and an alarm is issued to stop the supply of auxiliary steam to the equipment.

According to a ninth aspect of the present invention, the control means controls the communication valve so as to stop the supply of steam from a main steam pipe provided in the combined facility that has stopped operating.
In the case where there are a plurality of main steam pipes, if the power generation demand decreases, the number of the series may be reduced and one of the main steam pipes may be stopped. In such a case, the auxiliary steam can be supplied to the equipment more efficiently by closing the communication valve so that other series of steam does not flow to the stopped main steam pipe.

  According to the present invention, a plurality of series main steam pipes are communicated, and each series is provided with a decompression means for depressurizing and a temperature reducer for reducing temperature, and the pressure and temperature at the outlet of each temperature reducer are monitored. Therefore, it is possible to configure a duplex system that automatically switches to the other series and continues operation when one series fails. .

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. However, the components, types, combinations, shapes, relative arrangements, and the like described in this embodiment are merely illustrative examples and not intended to limit the scope of the present invention only unless otherwise specified. .
FIG. 1 is a diagram showing a configuration of an auxiliary steam supply apparatus according to an embodiment of the present invention. In this auxiliary steam supply apparatus 100, steam is taken out from main steam pipes 23 and 24 provided in two series of combined facilities, and this steam is decompressed and reduced in temperature to generate auxiliary steam, which is then used as auxiliary steam. An apparatus for supplying the outdoor equipment 17 through the pipe 25 will be described.

  The auxiliary steam supply device 100 includes a communication valve 3 for joining the steam supplied from the main steam pipe 23 of the No. 1 series combined facility 1 and the steam supplied from the main steam pipe 24 of the No. 2 series combined equipment 9, A pressure adjustment valve (decompression means) 2 for reducing the pressure of steam supplied from the main steam pipe 23 of the No. 1 series combined facility 1 and a supply valve 4 for passing or stopping the reduced-pressure steam reduced by the pressure adjustment valve 2 And a temperature reducer 5 that lowers the temperature of the reduced-pressure steam that has passed through the supply valve 4, a temperature-reducing water pump 7 that supplies the cooling water 26 to the temperature reducer 5, and the pressure and temperature at the outlet of the temperature reducer 5. A pressure / temperature detection unit (pressure / temperature detection means) 8 to be detected, and a control for controlling the communication valve 3, the supply valve 4 and the temperature-reducing water pump 7 based on the pressure or temperature detected by the pressure / temperature detection unit 8. Department ( No.1 sequence comprises a control means) 22, a is configured.

The No. 2 series includes a pressure adjusting valve (decompression means) 10 for reducing the pressure of the steam supplied from the main steam pipe 24 of the No. 2 series combined facility 9, and passage of reduced-pressure steam reduced by the pressure adjusting valve 10. A supply valve 12 for stopping, a temperature reducer 14 for reducing the temperature of the reduced-pressure steam that has passed through the supply valve 12, a temperature-reducing water pump 11 for supplying cooling water 27 to the temperature reducer 14, and an outlet of the temperature reducer 14 Based on the pressure or temperature detected by the pressure / temperature detector 15, the communication valve 3, the supply valve 12, and the temperature-reduced water And a control unit (control means) 22 for controlling the pump 11. The No. 1 series and No. 2 series may be controlled by the common control unit 22, and a control unit may be provided for each series. In FIG. 1, the solid line represents a pipe through which steam and cooling water pass, and the broken line represents a control line for the control unit 22 to control the communication valve 3, the supply valve 12, and the temperature-reducing water pump 11.
The outdoor equipment 17 includes a pure water device 18 used for a vacuum steam ejector for deaeration, a return gas blower 19 used for humidifying a lubricating oil tank, an ammonia vaporization equipment 20 for vaporizing liquefied ammonia with steam, and an LNG reception. And an LNG sampling vaporizer 21 that is sometimes vaporized for sampling.

  In FIG. 1, the range from the No. 1 series combined facility 1 to the pressure adjustment valve 2 and the communication valve 3 is called a main steam pipe 23, and the range from the No. 2 series combined facility 9 to the pressure adjustment valve 10 and the communication valve 3 is the main steam pipe Call 24. And the steam which flows through the main steam pipes 23 and 24 is called main steam. The pipe connecting the temperature reducer 5 and the temperature reducer 14 is called an auxiliary steam pipe 25, and the steam flowing through the auxiliary steam pipe 25 is called auxiliary steam. In FIG. 1, there are supply valves 6 and 13 for passing or stopping the cooling water discharged from the temperature-reducing water pumps 7 and 11, but they may be omitted.

FIG. 2 is a flowchart showing a typical operation example of the auxiliary steam supply apparatus according to the embodiment of the present invention. A description will be given with reference to FIG. The vapor pressure of the No. 1 series combined equipment 1 and the vapor pressure of the No. 2 series combined equipment 9 are adjusted in advance to be substantially equal, and the pressure regulating valves 2 and 10 are adjusted to a predetermined pressure (7 kg / cm ² ) in advance. Has been. First, in order to join the main steam flowing through the No. 1 series combined facility 1 and the main steam flowing through the No. 2 series combined facility 9, the control unit 22 opens the connection valve 3 via the control line 56 (S1). Next, the control unit 22 closes the No. 1 series supply valve 4 so that auxiliary steam is not supplied to the temperature reducer 5 (S2). Further, in order to avoid waste of electric power, the control unit 22 stops the No. 1 series temperature-reducing water pump 7 so that the cooling water 26 is not supplied to the temperature-reducing device 5 (S3). Next, the control unit 22 opens the No. 2 series supply valve 12 so that auxiliary steam is supplied to the temperature reducer 14 (S4). Further, the No. 2 series temperature-reduction water pump 11 is driven so that the cooling water 27 is supplied to the temperature reducer 14 (S5). As a result, the auxiliary steam that has been decompressed and reduced in temperature is output from the temperature reducer 14. The auxiliary steam is supplied to the outdoor facility 17 through the auxiliary steam pipe 25. Further, the pressure and temperature of the auxiliary steam are always detected by the pressure / temperature detector 15 (S6, S18), and data is transmitted to the controller 22 via the signal line 55. When the pressure and temperature are normal (YES in both S6 and S18), the process returns to step S5 and continues to drive the No. 2 series water-cooled water pump 11.

  If an abnormality occurs in the pressure or temperature (S6 or S18 is NO route), the control unit 22 generates an alarm (S7), and the control unit 22 closes the No. 2 series supply valve 12. The auxiliary steam is prevented from being supplied to the temperature reducer 14 (S8). Further, in order to avoid waste of electric power, the control unit 22 stops the No. 2 series temperature-reducing water pump 11 so that the cooling water 27 is not supplied to the temperature reducing device 14 (S9). Next, the control unit 22 opens the supply valve 4 of the No. 1 series so that auxiliary steam is supplied to the temperature reducer 5 (S10). Further, the No. 1 series temperature-reduction water pump 7 is driven so that the cooling water 26 is supplied to the temperature reducer 5 (S11). As a result, the auxiliary steam that has been decompressed and reduced in temperature is output from the temperature reducer 5. The auxiliary steam is supplied to the outdoor facility 17 through the auxiliary steam pipe 25. Further, the pressure and temperature of the auxiliary steam are always detected by the pressure / temperature detector 8 (S12, S19), and data is transmitted to the controller 22 via the signal line 52. If the pressure and temperature are normal (S12 and S19 are both YES routes), the process returns to step S11 and continues to drive the No. 1 series dewarmed water pump 7.

If an abnormality occurs in the pressure or temperature (NO route in either S12 or S19), the control unit 22 generates an alarm (S13), and the control unit 22 closes the supply valve 4 of the No. 1 series. The auxiliary steam is prevented from being supplied to the temperature reducer 5 (S14). Further, in order to avoid waste of electric power, the control unit 22 stops the No. 1 series temperature-reducing water pump 7 so that the cooling water 26 is not supplied to the temperature-reducing device 5 (S15). Then, it is checked whether the No. 2 series has been restored (S16). If it has been restored (YES in S16), the process returns to step S4 and is repeated. On the other hand, if not returned in step S16 (NO route in S16), the supply valves 4 and 12 are closed in order to stop the supply of auxiliary steam (S17).
In the present embodiment, the No. 2 series auxiliary steam is supplied to the outdoor equipment as a main and the No. 1 series auxiliary steam is used as a backup. However, the No. 1 series auxiliary steam may be supplied as a main to the outdoor equipment. Absent.

  FIG. 3 is a diagram schematically showing the embodiments of the auxiliary steam supply device of the present invention, in which only main components are shown, and other components are not shown. The same components will be described with the same reference numerals as in FIG. FIG. 3A shows the first embodiment. In this embodiment, the communication valve 3 is opened, the supply valve 4 is closed, the supply valve 12 is opened, and the temperature-reducing water pump 11 is driven. That is, the main steam supplied from the No. 1 series combined equipment 1 and the main steam supplied from the No. 2 series combined equipment 9 are merged by the communication valve 3, and the No. 2 series temperature reducer 14 is supplied via the supply valve 12. And is supplied to the outdoor facility 17 through the auxiliary steam pipe 25.

  FIG. 3B is a diagram showing a modification of the first embodiment. In this embodiment, the communication valve 3 is opened, the supply valve 12 is closed, the supply valve 4 is opened, and the temperature-reducing water pump 7 is driven. That is, the main steam supplied from the No. 1 series combined equipment 1 and the main steam supplied from the No. 2 series combined equipment 9 are merged by the communication valve 3, and the No. 1 series temperature reducer 5 is supplied via the supply valve 4. And is supplied to the outdoor facility 17 through the auxiliary steam pipe 25.

  FIG. 3C is a diagram showing a modification of the second embodiment. In this embodiment, the communication valve 3 is opened, the supply valves 4 and 12 are opened, and the temperature-reducing water pumps 7 and 11 are driven. That is, the main steam supplied from the No. 1 series combined equipment 1 and the main steam supplied from the No. 2 series combined equipment 9 are merged by the communication valve 3, and the No. 1 series temperature reducer 5 is supplied via the supply valve 4. And is supplied to the outdoor facility 17 through the auxiliary steam pipe 25, and the temperature is reduced by the No. 2 series temperature reducer 14 through the supply valve 12, and the outdoor equipment 17 through the auxiliary steam pipe 25. To be supplied.

  FIG. 3D is a diagram showing a modification of the third embodiment. In this embodiment, the communication valve 3 is closed, the supply valves 4 and 12 are opened, and the temperature-reducing water pumps 7 and 11 are driven. That is, the main steam supplied from the No. 1 series combined equipment 1 and the main steam supplied from the No. 2 series combined equipment 9 are diverted because the communication valve 3 is closed, and supplied from the No. 1 series combined equipment 1. The main steam is reduced in temperature by the No. 1 series temperature reducer 5 through the supply valve 4, supplied to the outdoor equipment 17 through the auxiliary steam pipe 25, and supplied from the No. 2 series combined equipment 9. The main steam is reduced in temperature by the No. 2 series temperature reducer 14 via the supply valve 12 and supplied to the outdoor facility 17 via the auxiliary steam pipe 25.

As described above, according to the present invention, the main steam flowing through the two main steam pipes 23 and 24 are merged by the communication valve 3, and the pressure adjustment valves 2 and 10 for reducing the pressure in each series and the temperature reducing to reduce the temperature. 5 and 14, the pressure and temperature at the outlet of each desuperheater 5 and 14 are monitored, and based on the result, it is determined which series of auxiliary steam is effective, so that one of the series fails. In this case, it is possible to configure a duplex system that automatically switches to the other system and continues operation.
In addition, since only one of a plurality of trains is operated and the other trains are stopped at that time, useless power can be minimized.

Further, while the pressure / temperature detector 8 or 15 detects normal pressure and temperature, it is assumed that the operation is normal, and auxiliary steam output from the currently operating temperature reducer is used as the outdoor equipment 17. Therefore, the state of the apparatus can be accurately determined from the pressure or temperature of the auxiliary steam output from the temperature reducer.
In addition, when an abnormal situation is detected by the pressure / temperature detector 8 or 15, an alarm is generated, the current decelerator is stopped, the other desuperheaters are operated, and the auxiliary steam is activated. Can be automatically switched to another system, and the auxiliary steam to the outdoor equipment 17 can be prevented from being interrupted.

In addition, the main steam from the main steam pipes is merged, the steam from each series is decompressed and reduced, and the auxiliary steam is supplied to the auxiliary steam pipes in parallel. Can be supplied.
Also, the communication valve is shut off so that the main steam in the main steam pipe does not merge, and the steam from each series is reduced and reduced in temperature, and the auxiliary steam is supplied to the auxiliary steam pipe in parallel. However, auxiliary steam can be supplied from other systems.
Moreover, since the combined facility is configured by a power generation system that combines gas turbine power generation and steam turbine power generation, power generation efficiency can be maximized.

In addition, the control means generates an alarm and shuts off all supply valves when the pressure or temperature of the auxiliary steam output from all series of desuperheaters does not satisfy the predetermined value. It is possible to prevent abnormal steam from being supplied to the facility.
In addition, since the control means controls the communication valve so as to stop the supply of steam from the main steam pipe provided in the combined facility whose operation has been stopped, other series of steam does not flow to the stopped main steam pipe. In this way, the auxiliary steam can be efficiently supplied to the outdoor facility.

It is a figure which shows the structure of the auxiliary steam supply apparatus which concerns on embodiment of this invention. It is a flowchart which shows the typical operation example of the auxiliary steam supply apparatus which concerns on embodiment of this invention. It is the figure which represented each embodiment of the auxiliary steam supply apparatus of this invention typically. It is a figure which shows the structural example of the conventional outdoor equipment auxiliary | assistant steam supply apparatus.

Explanation of symbols

  1 Series 1 combined facility, 2 Pressure adjustment valve, 3 Contact valve, 4 Supply valve, 5 Temperature reducer, 7 Temperature reducing water pump, 8 Pressure / temperature detection unit, 9 Series 2 combined facility, 22 Control unit, 23 Main Steam pipe, 24 main steam pipe, 26 cooling water, 100 auxiliary steam supply device

Claims (9)

An auxiliary steam supply device that extracts steam from main steam pipes provided in each of a plurality of combined facilities, generates auxiliary steam by depressurizing and reducing the steam, and supplies the auxiliary steam to the equipment through the auxiliary steam pipe. There,
At least one communication valve for joining the steam supplied from the main steam pipes of each series, decompression means for individually reducing the pressure of the steam supplied from the main steam pipes of the series, and the decompression means A supply valve for passing or stopping the reduced-pressure steam depressurized by the above, a temperature reducer for reducing the temperature of the reduced-pressure steam that has passed through the supply valve, a temperature-reduction water pump for supplying cooling water to the temperature reducer, and Based on the pressure / temperature detection means for detecting the pressure and temperature at the outlet of the temperature reducer, and the pressure or temperature detected by the pressure / temperature detection means, the communication valve, the supply valve and the temperature-reduction water pump are controlled. And an auxiliary steam supply device.   The control means joins the steam supplied from the main steam pipes by opening the communication valve, and depressurizes and reduces the temperature of at least one series of steams supplied from the main steam pipes. The auxiliary steam supply device according to claim 1, wherein the supply valve and the temperature-reducing water pump are controlled so as to generate auxiliary steam and supply the auxiliary steam to the facility.   The control means detects that the pressure at the outlet of the desuperheater is within a predetermined pressure range by the pressure / temperature detection means, and the temperature at the outlet of the desuperheater is within a predetermined temperature range. 2 or 2, wherein the supply valve and the temperature-decreasing water pump are controlled so as to supply the auxiliary steam output from the temperature-decreasing device currently in operation to the facility. 3. The auxiliary steam supply device according to 2.   The control means detects that the pressure at the outlet of the desuperheater exceeds a predetermined pressure range by the pressure / temperature detecting means, or the temperature at the outlet of the desuperheater is within a predetermined temperature range. Is detected, an alarm is generated, the supply of the auxiliary steam output from the currently operating temperature reducer is stopped, and the temperature-reducing water pumps of other series are turned off. The said supply valve and a temperature-reduction water pump are controlled so that it drives and supplies the said auxiliary | assistant steam output from the temperature-reduction device temperature-reduced by this temperature-reduction water pump to the said installation. Or the auxiliary steam supply device according to 3.   The control means joins the steam supplied from the main steam pipes by opening the communication valve, and generates auxiliary steam by depressurizing and reducing the temperature of each steam supplied from the main steam pipes. The auxiliary steam supply device according to claim 1, wherein the supply valve and the temperature-reducing water pump are controlled to supply the auxiliary steam to the facility.   The control means diverts the steam supplied from each main steam pipe by closing the communication valve, and generates auxiliary steam by depressurizing and reducing the temperature of each steam supplied from each main steam pipe. The auxiliary steam supply device according to claim 1, wherein the supply valve and the temperature-reducing water pump are controlled to supply the auxiliary steam to the facility.   The auxiliary steam supply device according to any one of claims 1 to 6, wherein the combined facility is configured by a power generation system that combines gas turbine power generation and steam turbine power generation.   The control means generates an alarm and closes all the supply valves when the pressure or temperature of the auxiliary steam output from the temperature reducers of all series does not satisfy a predetermined value. The auxiliary steam supply device according to any one of claims 1 to 7, wherein   The said control means controls the said connection valve so that the supply of the steam from the main steam pipe with which the said combined facility which stopped operation | movement was stopped may be stopped. Auxiliary steam supply device described in 1.

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