JP2001289009A - Single-shaft combined turbine equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To optimally adjust the metal temperature of a high-pressure turbine 6. SOLUTION: The starting steam from a second steam lead-in passage 31 is led into a high-pressure turbine 6 and a middle-pressure turbine 7 so as to start the operation. Temperature rise of a low-pressure turbine 8 is restricted, and the motive power is mainly generated by the middle-pressure turbine 7, and while the high-pressure turbine 6 is cooled, and a temperature difference when the boiler steam is led after starting the operation is reduced so as to optimally adjust the metal temperature of the high-pressure turbine 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single-shaft combined turbine system constructed by connecting a gas turbine, a high-pressure steam turbine and a low-pressure steam turbine on a single shaft. It is intended.

[0002]

2. Description of the Related Art From the viewpoints of effective utilization of energy resources and economic efficiency, various high efficiencies have been achieved in power generation plants. One of them is a single-shaft combined turbine facility that connects a gas turbine and a steam turbine composed of a high-pressure steam turbine and a low-pressure steam turbine uniaxially and drives a coaxially arranged generator.

[0003] In a single-shaft combined turbine facility, exhaust gas from a gas turbine is sent to an exhaust heat recovery device (exhaust gas boiler), and steam is generated in the exhaust gas boiler via a heating unit. They are sent to work on steam turbines. The steam discharged from the high-pressure side steam turbine is heated by the exhaust gas boiler and then sent to the low-pressure side steam turbine for work.

When driving a single-shaft combined turbine facility, the gas turbine is rotated to some extent by an electric motor, an internal combustion engine, or the like, and required compressed air is supplied to the gas turbine from a compressor attached to the gas turbine. To ignite the combustor of the gas turbine. In this case, an electric motor for starting and an internal combustion engine are required, and the equipment becomes large. Therefore, conventionally, when driving a single-shaft combined turbine facility, the starting steam is introduced into the steam turbine at the time of startup, whereby the steam turbine is rotated to rotate the gas turbine, thereby starting up the facility.

[0005]

When a single-shaft combined turbine facility is started, the temperature matched to the rotor metal temperature so that excessive thermal stress does not act on the high-pressure steam turbine rotor and the low-pressure steam turbine rotor. It is important to introduce the starting steam. However, since the steam turbine of the single-shaft combined turbine facility is a reheat type in which the high-pressure steam turbine and the low-pressure steam turbine (reheat side) are provided on a single shaft, the The rotor metal temperature is different. For this reason, it was difficult to appropriately introduce the starting steam.

[0006] The present invention has been made in view of the above circumstances, and has as its object to provide a single-shaft combined turbine facility that can appropriately introduce starting steam.

[0007]

According to the present invention, there is provided a gas turbine, comprising: a gas turbine, a high-pressure steam turbine, and a low-pressure steam turbine, which are connected on a single axis to recover exhaust heat of the gas turbine; An exhaust heat recovery device that generates steam through the exhaust heat recovery device; and a high pressure side path that introduces steam from the exhaust heat recovery device to the high pressure side steam turbine. The exhaust steam from the high pressure side steam turbine and the exhaust heat recovery device In the single-shaft combined turbine facility provided with a low-pressure side passage for introducing steam from the steam turbine to the low-pressure side steam turbine, a second steam for introducing the second steam to the high-pressure side steam turbine at startup is provided.
A steam introduction path is provided.

According to another aspect of the present invention, a gas turbine, a high-pressure steam turbine and a low-pressure steam turbine are connected uniaxially, and the exhaust heat of the gas turbine is recovered to generate steam. Equipped with an exhaust heat recovery device
A high-pressure path for introducing steam from the exhaust heat recovery device to the high-pressure steam turbine; and introducing steam discharged from the high-pressure steam turbine and steam from the exhaust heat recovery device to the low-pressure steam turbine. In a single-shaft combined turbine facility provided with a low-pressure side path, a second steam introduction path for introducing a second steam into the high-pressure side steam turbine and the low-pressure side steam turbine at the time of startup is provided.

In the second steam introduction path, a flow rate adjustment path and a temperature adjustment path are provided independently, and the flow rate adjustment path and the temperature adjustment path are respectively connected to the introduction side. . Further, the second steam introduction path is provided with a flow adjustment introduction path and a temperature adjustment introduction path, and a plurality of parallel paths are provided in each of the flow adjustment introduction path and the temperature adjustment introduction path, and each of the parallel paths is provided. Orifices having different flow passage areas are provided, and on / off valves are provided in each of the parallel paths.

[0010] A condenser is provided on the discharge side of the low-pressure steam turbine, and the steam that has been introduced into the high-pressure steam turbine from the second steam introduction path and worked has been introduced into the condenser. It is characterized by having a condensate path. Further, a recovery path is provided for introducing the steam introduced from the second steam introduction path to the high-pressure side steam turbine and performing work to the low-pressure side steam turbine side.

[0011] Further, a plurality of single-shaft combined turbine equipment is provided, and an introduction other can path for introducing steam from another equipment as the second steam into the second steam introduction path is provided. In addition, a plurality of single-shaft combined turbine facilities are provided, and a discharge / canister path is provided for discharging the steam introduced from the second steam introduction path to the high-pressure side steam turbine and performing work to an exhaust heat recovery device in another facility. It is characterized by having. In addition, a plurality of single-shaft combined turbine equipment is provided, an introduction other can path for introducing steam from another equipment as the second steam into the second steam introduction path, and the high pressure side from the second steam introduction path. The steam turbine is characterized in that the steam turbine is provided with another discharge can route for discharging the steam introduced into the steam turbine and performing work to a waste heat recovery device in another facility.

According to another aspect of the present invention, a gas turbine, a high-pressure steam turbine, an intermediate-pressure steam turbine, and a low-pressure steam turbine are connected uniaxially, and exhaust heat of the gas turbine is recovered. An exhaust heat recovery device for generating steam; a high-pressure side path for introducing steam from the exhaust heat recovery device to the high-pressure steam turbine; and an exhaust steam from the high-pressure steam turbine and a steam from the exhaust heat recovery device. In the single-shaft combined turbine facility having a low-pressure side path for introducing the second steam into the medium-pressure steam turbine, a second steam introduction path for introducing the second steam into the high-pressure steam turbine at the time of startup is provided.

According to another aspect of the present invention, a gas turbine, a high-pressure steam turbine, an intermediate-pressure steam turbine, and a low-pressure steam turbine are connected uniaxially to recover exhaust heat of the gas turbine. An exhaust heat recovery device for generating steam; a high-pressure side path for introducing steam from the exhaust heat recovery device to the high-pressure steam turbine; and an exhaust steam from the high-pressure steam turbine and a steam from the exhaust heat recovery device. In the single-shaft combined turbine facility provided with a low-pressure side path for introducing the second steam into the medium-pressure steam turbine, a second steam introduction path for introducing the second steam into the high-pressure steam turbine and the medium-pressure steam turbine at startup is provided. It is characterized by the following.

[0014]

FIG. 1 shows a schematic system configuration of a single-shaft combined turbine facility according to a first embodiment of the present invention. FIG. 2 shows a change with time of the turbine shaft rotation speed and the amount of steam for startup at the time of startup.
Fig. 2 (a) shows the change over time in the turbine shaft rotation speed, and Fig. 2 (b)
Changes in the starting steam introduced into the medium pressure turbine over time,
FIG. 2 (c) shows the change over time of the starting steam introduced into the high-pressure turbine.

As shown in FIG. 1, a compressor 1 and a combustor 2
And a gas turbine 4 having a turbine 3. A steam turbine 5 is connected coaxially with the gas turbine 4. The steam turbine 5 is configured such that a high-pressure turbine 6 as a high-pressure steam turbine, a medium-pressure turbine 7 as a low-pressure steam turbine, and a low-pressure turbine 8 are connected to one shaft. Exhaust gas from the gas turbine 4 is sent to an exhaust gas boiler 9 as an exhaust heat recovery device. The exhaust gas boiler 9 includes a high-pressure superheater 10, an intermediate-pressure superheater 11, and a low-pressure heater 12. I have. A reheater 13 is provided downstream of the high-pressure superheater 10 of the exhaust gas boiler 9.
Is provided. Although not shown, the exhaust gas boiler 9 is provided with respective drums, evaporators, and the like for high, medium, and low pressures.

The high-pressure steam generated in the high-pressure superheater 10 of the exhaust gas boiler 9 is supplied to a high-pressure steam line 15 as a high-pressure side passage.
Is sent to the high-pressure turbine 6, and the steam discharged from the high-pressure turbine 6 is sent to the reheater 13 by the reheating line 16. The steam superheated by the reheater 13 is sent to the medium pressure turbine 7 through the medium pressure steam line 17 as a low pressure side path,
It is sent to the condenser 18 via the low-pressure turbine 8. The medium-pressure steam generated in the medium-pressure superheater 11 of the exhaust gas boiler 9 is sent from the medium-pressure line 19 to the reheater 13, and is sent to the medium-pressure turbine 7 by the medium-pressure steam line 17. Further, the low-pressure steam generated in the low-pressure superheater 12 of the exhaust gas boiler 9 is sent to the low-pressure turbine 8 through the low-pressure steam line 20.

Therefore, the exhaust heat of the gas turbine 4 is recovered by the exhaust gas boiler 9 to generate steam, and the steam generated by the exhaust gas boiler 9 is sent to the steam turbine 5 to perform work in the steam turbine 5. ing.

A high pressure bypass line 21 is provided branching from the high pressure steam line 15, and the high pressure bypass line 21 is connected to the reheating line 16. The high-pressure bypass line 21 controls the flow of steam by opening and closing the HP-TB valve 22. Further, a medium pressure bypass line 23 is provided, which branches off from the medium pressure steam line 17.
3 Condenser 18 is connected to the medium pressure part. The flow of steam in the intermediate pressure bypass line 23 is controlled by opening and closing the IP-TB valve 24. Further, a low-pressure bypass line 25 is provided branching from the low-pressure steam line 20, and the low-pressure bypass line 25 is connected to a low-pressure portion of the condenser 18.
In the low-pressure bypass line 25, the flow of steam is controlled by opening and closing the LP-TB valve 26. The HP-TB valve 22, the IP-TB valve 24, and the LP-TB valve 26 are controlled to open and close according to commands from a control device (not shown), and the flow of steam and the water level of the drum (not shown) are adjusted.

In the figure, reference numeral 27 denotes a generator, and 28 denotes a fuel compressor. Fuel is pressurized by the fuel compressor 28 and sent to the combustor 2 of the gas turbine 4. The high-pressure steam line 15 on the inlet side of the high-pressure turbine 6 is provided with a high-pressure flow control valve 29, and the medium-pressure steam line 17 on the inlet side of the intermediate-pressure turbine 7 is provided with a medium-pressure flow control valve 30. . The high-pressure flow control valve 29 and the medium-pressure flow control valve 30 are appropriately opened and closed according to the operation state of the equipment.

On the other hand, a second steam introduction path 31 is provided for introducing the starting steam, which is the second steam, to the high-pressure turbine 6 and the medium-pressure turbine 7 when the single-shaft combined turbine equipment is started. The second steam introduction path 31 includes a high-temperature steam line 32 as a temperature adjustment path and a low-temperature steam line 33 as a flow rate adjustment path, and the high-temperature steam line 32 and the low-temperature steam line 33 join to form a second steam line 34. Is formed. The high temperature steam line 32 is provided with a high temperature flow control valve 35, and the low temperature steam line 33 is provided with a low temperature flow control valve 36.

The second steam line 34 has a temperature detecting means 37
Is provided, and the high temperature flow control valve 35 is controlled to open and close according to the detection information of the temperature detecting means 37. Thus, the flow rate of the high-temperature steam is controlled, and the temperature of the starting steam in the second steam line 34 is appropriately controlled. The second steam line 34 is provided with a pressure detecting means 38, and the low temperature flow control valve 36 is controlled to open and close according to the detection information of the pressure detecting means 38. Thereby, the flow rate of the low-temperature steam is controlled and the second steam line 3
The amount of the starting steam of No. 4 is appropriately controlled.

The second steam line 34 is provided with the medium pressure flow control valve 3
The medium pressure second steam line 41 communicating with the medium pressure steam line 17 on the upstream side of the high pressure flow control valve 29 and the high pressure second steam line 42 communicating with the high pressure steam line 15 on the downstream side of the high pressure flow control valve 29. . An intermediate-pressure electric on-off valve 43 is provided on the intermediate-pressure steam line 17 on the upstream side of the communication part of the intermediate-pressure second steam line 41, and a high-pressure electric on-off valve 44 is provided on the high-pressure second steam line 42. Further, the bypass line 45 branches off from the reheating line 16 and serves as a condensate path.
The bypass line 45 is provided with an on-off valve 46. The bypass line 45 communicates with the condenser 18. When the starting steam is sent from the second steam introduction path 31 to the high-pressure turbine 6, the steam discharged from the high-pressure turbine 6 is sent from the bypass line 45 to the condenser 18.

In the single-shaft combined turbine facility having the above structure, the exhaust gas of the gas turbine 4 is supplied to the exhaust gas boiler 9.
The exhaust heat of the gas turbine 4 is recovered by the exhaust gas boiler 9 to generate steam, and the steam generated by the exhaust gas boiler 9 is sent to the steam turbine 5 to perform work in the steam turbine 5.

That is, the high-pressure superheater 10 of the exhaust gas boiler 9
Steam is introduced into the high-pressure turbine 6 from the
The steam that has been worked at is sent from the reheat line 16 to the reheater 13 where it is superheated, and is introduced into the medium pressure turbine 7 from the medium pressure steam line 17. The steam introduced into the intermediate pressure turbine 7 works in the intermediate pressure turbine 7 and is sent to the low pressure turbine 8, while steam is introduced into the low pressure turbine 8 from the low pressure superheater 12. The steam that worked in the low-pressure turbine 8 is supplied to the condenser 18
Sent to

At this time, the intermediate-pressure electric on-off valve 43 is opened, the high-temperature flow control valve 35, the low-temperature flow control valve 36, the high-pressure electric on-off valve 44 and the on-off valve are closed, and the HP-TB valve 2 is closed.
2. IP-TB valve 24, LP-TB valve 26, high-pressure flow control valve 29
And the opening degree of the intermediate pressure flow control valve 30 is appropriately adjusted.

When the single-shaft combined turbine equipment is started, after starting steam is introduced from the second steam introduction line 31 to increase the turbine rotation speed, the combustor 2 is ignited in a state where misfire does not occur and gas is emitted. The turbine 4 is driven.
After the turbine rotation speed reaches a predetermined speed, the introduction of the startup steam from the second steam introduction line 31 is stopped, and the steam (self-canned steam) from the exhaust gas boiler 9 causes the steam turbine 5 to rotate.
Drive.

That is, at the time of start-up, the medium-pressure electric on-off valve 43 and the high-pressure flow control valve 29 are closed and the high-pressure electric on-off valve 4
4, the starting steam is introduced from the second steam introduction path 31. The introduction temperature and the introduction amount of the starting steam are adjusted by adjusting the high-temperature flow control valve 35 of the high-temperature steam line 32 by the temperature detection means 37 and adjusting the low-temperature flow adjustment valve 36 of the low-temperature steam line 33 by the pressure detection means 38. Controlled.

Medium pressure flow control valve 30 and high pressure electric open / close valve 4
By controlling the opening and closing of 4, the amount of steam introduced from the intermediate-pressure second steam line 41 to the intermediate-pressure turbine 7 and the amount of steam introduced from the high-pressure second steam line 42 to the high-pressure turbine 6 are adjusted. For example, as shown in the state shown in FIG. 2, the starting steam of Ston is introduced into the high-pressure turbine 6 and the intermediate-pressure turbine 7 at the time of starting before rotation, and the medium-pressure turbine 7 is started at the time of starting rotation until ignition starts. Is temporarily increased to Tton (for example, T = 5S), and after the combustor 2 is ignited, the high-pressure turbine 6 and the intermediate-pressure turbine 7 supply the starting steam to the Ton until the rotation is stabilized. Is introduced. The amount of the starting steam is appropriately set according to the scale of the steam turbine 5 and the power ratio of the high-pressure turbine 6 and the medium-pressure turbine 7.

When the combustor 2 is ignited and the rotation speed of the turbine shaft is sufficiently increased to reach a predetermined rotation speed, the intermediate pressure electric open / close valve 43 and the high pressure flow regulating valve 29 are opened and the high pressure electric open / close valve 44 is closed. The introduction of the starting steam is completed, and the steam from the exhaust gas boiler 9 is introduced into the steam turbine 5.

The high-temperature steam line 32 and the low-temperature steam line 33 can be provided with dedicated steam lines. If the plant is equipped with a plurality of single-shaft combined turbine equipment, the steam of other equipment (steam of other cans)
The high-temperature steam line 32 and the low-temperature steam line 33 are provided with an introduction other can route for introducing
It is possible to provide a discharge other-can passage for discharging the starting steam recovered to the exhaust heat recovery device in another facility.

In the single-shaft combined turbine facility described above, the starting steam is supplied to the high-pressure turbine 6 and the medium-pressure turbine 7.
So that the low-pressure turbine 8
The work for starting can be performed mainly by the medium pressure turbine 7 while suppressing the temperature rise of the intermediate pressure turbine. For this reason, an electric motor for starting, an internal combustion engine, and the like are not required, and it is possible to avoid an increase in size of equipment.
At the same time, since the starting steam is introduced into the high-pressure turbine 6, the high-pressure turbine 6 can be cooled, and the temperature difference when the self-canister steam is introduced after the starting operation can be reduced. The metal temperature can be made appropriate.

A second embodiment of the present invention will be described with reference to FIGS. FIG. 3 shows a schematic system configuration of a single-shaft combined turbine facility according to a second embodiment of the present invention. FIG. 4 shows the change over time of the turbine shaft rotation speed and the amount of steam for startup at the time of startup.
4 (a) shows the change over time in the turbine shaft rotation speed, and FIG. 4 (b) shows the change over time in the amount of startup steam introduced. FIG.
The same reference numerals are given to the same members as those shown in FIG.

In the single-shaft combined turbine system shown in FIG. 3, the second steam line 34 is connected to the high-pressure steam line 15 on the upstream side of the branch of the high-pressure bypass line 21. The high-pressure electric on-off valve 44 is provided in the high-pressure steam line 15 on the upstream side of the communication part of the second steam line 34. That is, the starting steam is supplied to the second steam line 34.
Is sent to the high-pressure steam line 15 and is introduced only to the high-pressure turbine 6. Further, a recovery line 51 is provided as a recovery path branched from the reheating line 16.
1 communicates with a medium-pressure steam line 17 on the inlet side of the low-pressure turbine 7. In other words, the starting steam introduced into the high-pressure turbine 6 performs work in the high-pressure turbine 6 and then returns to the recovery line 51.
And from the intermediate-pressure steam line 17 to the intermediate-pressure turbine 7.

In the single-shaft combined turbine facility having the above structure, the exhaust gas of the gas turbine 4 is sent to the exhaust gas boiler 9 and the exhaust gas boiler 9
The exhaust heat of the gas turbine 4 is recovered to generate steam,
The steam generated in the exhaust gas boiler 9 is sent to the steam turbine 5 where the work is performed. At this time, the high-pressure electric on-off valve 44 is opened, the high-temperature flow control valve 35 and the low-temperature flow control valve 36 are closed, and the HP-TB valve 22,
The opening degrees of the IP-TB valve 24, the LP-TB valve 26, the high-pressure flow control valve 29, and the medium-pressure flow control valve 30 are appropriately adjusted.

At the time of startup, the high-pressure electric opening / closing valve 44 and the medium-pressure electric opening / closing valve 43 are closed, and starting steam whose introduction temperature and amount are controlled is introduced from the second steam introduction passage 31.
After the turbine rotation speed is increased, a misfire does not occur, the combustor 2 is ignited, and the gas turbine 4 is driven. After the turbine rotation speed reaches a predetermined speed, the gas turbine 4 is started from the second steam introduction line 31. The introduction of the steam is stopped, and the steam turbine 5 is driven by the steam (own steam) from the exhaust gas boiler 9.

The amount of steam introduced from the second steam line 34 to the high-pressure turbine 6 is adjusted by controlling the opening and closing of the high-pressure flow control valve 29. For example, as shown in the state shown in FIG. 4, the starting steam of Ston is introduced into the high-pressure turbine 6 at the time of startup before rotation, and Tton (for example, T = In 5S), the starting steam is increased, and the starting steam for Ston is introduced into the high-pressure turbine 6 until the rotation of the combustor 2 is stabilized after ignition. Also, at the time of ignition, the starting steam is temporarily increased. The amount of the starting steam is appropriately set according to the scale of the steam turbine 5 and the like.

When the combustor 2 is ignited and the rotation speed of the turbine shaft is sufficiently increased to reach a predetermined rotation speed, the high-pressure electric switching valve 44 and the medium-pressure electric switching valve 43 are opened to terminate the introduction of the starting steam, The steam from the exhaust gas boiler 9 is introduced into the steam turbine 5.

In the above-described single-shaft combined turbine facility, the starting steam is introduced into the high-pressure turbine 6 and the steam discharged from the high-pressure turbine 6 is introduced into the medium-pressure turbine 7 for starting. The start-up work can be performed by the high-pressure turbine 6 and the intermediate-pressure turbine 7 while suppressing the temperature rise. For this reason, an electric motor for starting and an internal combustion engine, etc. become unnecessary, and it becomes possible to avoid upsizing of equipment,
In addition, since the start-up steam flows through all stages, the temperature difference when the self-canister steam is introduced after the start-up operation can be extremely reduced, and the metal temperature of the steam turbine 5 can be made appropriate.

The high-temperature steam line 32 and the low-temperature steam line 33 can be provided with dedicated steam lines. If the plant is equipped with a plurality of single-shaft combined turbine equipment, the steam of other equipment (steam of other cans)
It is possible to provide a high-temperature steam line 32 and a low-temperature steam line 33 by providing an introduction other can route for introducing the steam.

A third embodiment of the present invention will be described with reference to FIG. FIG. 5 shows a schematic system configuration of a single-shaft combined turbine facility according to a third embodiment of the present invention. The same members as those shown in FIG. 1 are denoted by the same reference numerals, and duplicate description is omitted.

In the single-shaft combined turbine facility shown in FIG. 5, the second steam line 34 is connected to the high-pressure steam line 15 on the upstream side of the branch of the high-pressure bypass line 21. The high-pressure electric on-off valve 44 is provided in the high-pressure steam line 15 on the upstream side of the communication part of the second steam line 34. The second steam line 34 is constituted only by the high-pressure steam line 32, and the amount of the starting steam introduced is controlled by opening and closing the high-temperature flow control valve 35 based on information detected by the pressure detecting means 38. That is, the starting steam is sent from the second steam line 34 to the high-pressure steam line 15 and
Only introduced to. The starting steam introduced into the high-pressure turbine 6 is sent to the condenser 18 from the bypass line 45 after working in the high-pressure turbine 6.

In the single-shaft combined turbine facility having the above configuration, during normal operation, the exhaust gas of the gas turbine 4 is sent to the exhaust gas boiler 9 and the exhaust gas of the gas turbine 4 is exhausted by the exhaust gas boiler 9 as in the first embodiment. The heat is recovered to generate steam, and the steam generated by the exhaust gas boiler 9 is sent to the steam turbine 5 to perform work.

At the time of startup, the high-pressure electric open / close valve 44 is closed,
The startup steam whose introduction amount is controlled is supplied to the second steam introduction path 31.
Introduced from. After the turbine rotation speed is increased, a misfire does not occur, the combustor 2 is ignited, and the gas turbine 4 is driven. After the turbine rotation speed reaches a predetermined speed, the gas turbine 4 is started from the second steam introduction line 31. The introduction of the steam is stopped, and the steam turbine 5 is driven by the steam (own steam) from the exhaust gas boiler 9. At this time, the change over time of the turbine rotation speed and the introduced steam for startup is, for example, as shown in FIG. When the combustor 2 is ignited and the rotation speed of the turbine shaft increases sufficiently to reach a predetermined rotation speed,
Open the high-pressure electric on-off valve 44 and end the introduction of the starting steam,
The steam from the exhaust gas boiler 9 is introduced into the steam turbine 5.

At the time of startup, the metal temperature of the steam turbine 5 changes depending on the stop time, and the inlet temperatures of the high-pressure turbine 6, the medium-pressure turbine 7, and the low-pressure turbine 8 change accordingly. In the single-shaft combined turbine facility described above, since the starting steam is introduced only into the high-pressure turbine 6, temperature control of the starting steam is not necessary, and only the starting steam from the high-pressure steam line 32 is flow-controlled and introduced. can do. For this reason, the second steam introduction path 31 can be constituted only by the high-pressure steam line 32, and the equipment and control can be further simplified.

Incidentally, the high-temperature steam line 32 can be provided with a dedicated steam line. Also, if the plant is equipped with multiple single-shaft combined turbine equipment,
A high-temperature steam line 32 is provided with an introduction other-can passage for introducing steam (other-can steam) of another facility, or startup steam collected by the condenser 18 after work is recovered as waste heat in another facility. It is possible to provide a discharge can path to discharge to the device.

A fourth embodiment of the present invention will be described with reference to FIG. FIG. 6 shows a schematic system configuration of a single-shaft combined turbine facility according to a fourth embodiment of the present invention. The same members as those shown in FIG. 1 are denoted by the same reference numerals, and duplicate description is omitted.

In the single-shaft combined turbine system shown in FIG. 6, a high-pressure steam line 32 and a low-pressure steam line 33 are independently provided as a second steam introduction path 31, and each constitutes a second steam line 34. . The high-pressure steam line 32 is provided with a high-temperature flow control valve 35 and a temperature detection means 37, and the low-pressure steam line 33 is provided with a low-temperature flow control valve 36 and a pressure detection means 38. The second steam line 34 constituted by the high-pressure steam line 32 and the second steam line 34 constituted by the low-pressure steam line 33 respectively communicate with the high-pressure steam line 15 on the upstream side of the branch of the high-pressure bypass line 21. . The second steam line 3
A high-pressure electric on-off valve 44 is provided in the high-pressure steam line 15 on the upstream side of the communication section 4.

The temperature of the starting steam is controlled on the high-pressure steam line 32 side by opening and closing the high-temperature flow control valve 35 based on the detection information of the temperature detecting means 37, and the amount of the starting steam introduced is detected by the pressure detecting means 38. Opening and closing of the low temperature flow control valve 36 based on the information is controlled on the low pressure steam line 33 side. That is, the starting steam is sent from the independent second steam lines 34 to the high-pressure steam lines 15 respectively, and is introduced only into the high-pressure turbine 6. Further, the starting steam introduced into the high-pressure turbine 6 performs work in the high-pressure turbine 6 and then passes through the bypass line 4.
5 is sent to the condenser 18.

In the single-shaft combined turbine facility having the above configuration, during normal operation, the exhaust gas of the gas turbine 4 is sent to the exhaust gas boiler 9 and the exhaust gas of the gas turbine 4 is exhausted by the exhaust gas boiler 9 as in the first embodiment. The heat is recovered to generate steam, and the steam generated by the exhaust gas boiler 9 is sent to the steam turbine 5 to perform work.

At the time of startup, the high-pressure electric open / close valve 44 is closed,
The startup steam whose temperature is controlled is introduced from the second steam line 34 on the high-pressure steam line 32 side to the high-pressure turbine 6 through the high-pressure steam line 15. At the same time, the startup steam whose introduction amount is controlled is introduced from the second steam line 34 on the low-pressure steam line 33 side to the high-pressure turbine 6 through the high-pressure steam line 15. After the turbine rotation speed is increased, a misfire does not occur, the combustor 2 is ignited, and the gas turbine 4 is driven. After the turbine rotation speed reaches a predetermined speed, the gas turbine 4 is started from the second steam introduction line 31. The introduction of the steam is stopped, and the steam turbine 5 is driven by the steam (own steam) from the exhaust gas boiler 9. At this time, the change over time of the turbine rotation speed and the introduced steam for startup is, for example, as shown in FIG. When the combustor 2 is ignited and the rotation speed of the turbine shaft is sufficiently increased to reach a predetermined rotation speed, the high-pressure electric shut-off valve 44 is opened to terminate the introduction of the starting steam, and the self-canister steam from the exhaust gas boiler 9 is steamed. It is introduced into the turbine 5.

In the single-shaft combined turbine facility described above, the starting steam is separately introduced into the high-pressure turbine 6 from the high-pressure steam line 32 and the low-pressure steam line 33. Therefore, the temperature of the starting steam is adjusted independently. Can be
Even after startup, by adjusting the high-temperature flow control valve 35 and the high-pressure electric on-off valve 44, the temperature of the steam introduced into the high-pressure turbine 6 can be optimally controlled in accordance with the state of the self-steam.

In the above-described embodiment, the starting steam is separately introduced into the high-pressure turbine 6 from the high-pressure steam line 32 and the low-pressure steam line 33. It is also possible to introduce it into the turbine 7. Further, the starting steam introduced into the high-pressure turbine 6 performs work in the high-pressure turbine 6 and then passes through the bypass line 4.
5, the steam discharged from the high-pressure turbine 6 may be introduced into the medium-pressure turbine 7.

The high-temperature steam line 32 and the low-temperature steam line 33 can be provided with dedicated steam lines. If the plant is equipped with a plurality of single-shaft combined turbine equipment, the steam of other equipment (steam of other cans)
The high-temperature steam line 32 and the low-temperature steam line 33 are provided with an introduction other can route for introducing
It is possible to provide a discharge other-can passage for discharging the starting steam recovered to the exhaust heat recovery device in another facility.

A fifth embodiment of the present invention will be described with reference to FIG. FIG. 7 shows a schematic system configuration of a single-shaft combined turbine facility according to a fifth embodiment of the present invention. The same members as those shown in FIG. 1 are denoted by the same reference numerals, and duplicate description is omitted.

The single-shaft combined turbine equipment shown in FIG. 7 is different from the equipment of the first embodiment shown in FIG. 1 only in the second steam introduction path 31. Other configurations and operations are the same. Second steam introduction path 55 in the single-shaft combined turbine facility according to the fifth embodiment.
Has a high-temperature steam line 56 and a low-temperature steam line 57. The hot steam line 56 has three (plural)
Parallel paths 56a, 56b, 56c are provided and a low-temperature steam line 57
Is provided with three (plural) parallel paths 57a, 57b, 57c. The parallel paths 56a, 56b, 56c are provided with orifices 58a, 58b, 58c and on / off control opening / closing valves 59a, 59b, 59c having different flow path areas, respectively.The parallel paths 57a, 57b, 57c have respective flow path areas. Are provided with orifices 60a, 60b, 60c and on / off control on-off valves 61a, 61b, 61c.
On the downstream side of the parallel path, the high-temperature steam line 56 and the low-temperature steam line 57 join to form the second steam line 34.

The parallel paths 56a, 56b, 56 of the high-temperature steam line 56
By individually opening and closing the on / off control opening / closing valves 59a, 59b, 59c of c, the orifices 58a, 58b,
The amount of hot steam flowing through the hot steam line 56 is set according to 58c (according to the open passage), and the steam temperature is adjusted to appropriately control the temperature of the starting steam in the second steam line 34. . In addition, the parallel paths 57a of the low-temperature steam line 57,
By individually opening and closing the on / off control on / off valves 61a, 61b, 61c of the 57b, 57c, the orifice 60 through which steam passes
The amount of low-temperature steam flowing through the low-temperature steam line 57 is set according to a, 60b, and 60c (according to the open passage), and the steam flow rate is adjusted so that the flow rate of the starting steam in the second steam line 34 is appropriate. Is controlled.

In the single-shaft combined turbine equipment described above, the on-off of the on-off valves 59a, 59b, 59c and the on-off valves 61a, 61b, 61c sets the temperature and flow rate of the starting steam without using an expensive control valve. It is possible to manage the starting steam with a simple control.

The high-temperature steam line 56 and the low-temperature steam line 57 are not merged, and the starting steam is individually supplied to the high-pressure turbine 6.
And into the intermediate pressure turbine 7. It is also possible to introduce the starting steam only into the high-pressure turbine 6. Further, the starting steam introduced into the high-pressure turbine 6 performs work in the high-pressure turbine 6 and then passes through the bypass line 4.
The steam discharged from the high pressure turbine 6 may be introduced into the medium pressure turbine 7 side.

Further, the high-temperature steam line 56 and the low-temperature steam line 57 can be provided with dedicated steam lines. If the plant is equipped with a plurality of single-shaft combined turbine equipment, the steam of other equipment (steam of other cans)
A high-temperature steam line 56 and a low-temperature steam line 57 are provided with an introduction can route for introducing
It is possible to provide a discharge other-can passage for discharging the starting steam recovered to the exhaust heat recovery device in another facility.

[0060]

According to the single-shaft combined turbine equipment of the present invention, a gas turbine, a high-pressure steam turbine and a low-pressure steam turbine are connected on a single shaft, and the exhaust heat of the gas turbine is recovered to generate steam. A high-pressure side path for introducing steam from the exhaust heat recovery device to the high-pressure side steam turbine, wherein the low-pressure steam is discharged from the high-pressure side steam turbine and the steam from the exhaust heat recovery device. In the single-shaft combined turbine facility provided with the low-pressure side passage for introducing into the side steam turbine, the second steam introduction passage for introducing the second steam into the high-pressure side steam turbine at the time of starting is provided, so that the starting steam is appropriately introduced. It becomes possible to do.

Further, the single-shaft combined turbine equipment according to the present invention is configured such that the gas turbine, the high-pressure steam turbine and the low-pressure steam turbine are connected on a single shaft, and the exhaust heat of the gas turbine is recovered to generate steam. A high-pressure side path for introducing steam from the exhaust heat recovery device to the high-pressure side steam turbine, wherein the low-pressure steam is discharged from the high-pressure side steam turbine and the steam from the exhaust heat recovery device. In the single-shaft combined turbine facility provided with the low-pressure side path for introducing into the side steam turbine, the second steam introduction path for introducing the second steam into the high-pressure side steam turbine and the low-pressure side steam turbine at the time of startup is provided. It is possible to appropriately introduce steam for use.

In the second steam introduction path, a flow rate adjustment path and a temperature adjustment path are provided independently, and the flow rate adjustment path and the temperature adjustment path communicate with the introduction side, respectively. Can be adjusted independently, and even after the start-up, the temperature of the steam introduced to the introduction side can be optimally controlled according to the state of the steam in the can.

The second steam introduction path is provided with a flow adjustment introduction path and a temperature adjustment introduction path, and a plurality of parallel paths are provided in each of the flow adjustment introduction path and the temperature adjustment introduction path. Since an orifice having a different flow path area is provided in each of the paths, and an on-off valve is provided in each of the parallel paths, the temperature and flow rate of the starting steam can be set without using an expensive control valve, which is simple. The control makes it possible to manage the starting steam.

Further, the single-shaft combined turbine equipment of the present invention connects the gas turbine, the high-pressure steam turbine, the medium-pressure steam turbine, and the low-pressure steam turbine on one shaft,
An exhaust heat recovery device that recovers exhaust heat of the gas turbine to generate steam; a high-pressure side path that introduces steam from the exhaust heat recovery device into the high-pressure steam turbine; In a single-shaft combined turbine facility having a low-pressure side path for introducing steam and steam from the exhaust heat recovery device to the medium-pressure steam turbine, a second steam for introducing the second steam to the high-pressure steam turbine at startup is provided.
Since the steam introduction path is provided, it is possible to appropriately introduce the starting steam.

Further, the single-shaft combined turbine equipment of the present invention connects the gas turbine, the high-pressure steam turbine, the medium-pressure steam turbine, and the low-pressure steam turbine on one shaft,
An exhaust heat recovery device that recovers exhaust heat of the gas turbine to generate steam; a high-pressure side path that introduces steam from the exhaust heat recovery device into the high-pressure steam turbine; In a single-shaft combined turbine facility having a low-pressure side path for introducing steam and steam from the exhaust heat recovery device to the medium-pressure steam turbine, a second steam is supplied to the high-pressure steam turbine and the medium-pressure steam turbine at startup. Since the second steam introduction path to be introduced is provided,
It is possible to appropriately introduce the starting steam.

[Brief description of the drawings]

FIG. 1 is a schematic system configuration diagram of a single-shaft combined turbine facility according to a first embodiment of the present invention.

FIG. 2 is a graph showing a temporal change in a turbine shaft rotation speed and a startup steam amount at startup.

FIG. 3 is a schematic system configuration diagram of a single-shaft combined turbine facility according to a second embodiment of the present invention.

FIG. 4 is a graph showing a change with time of a turbine shaft rotation speed and a startup steam amount at startup.

FIG. 5 is a schematic system configuration diagram of a single-shaft combined turbine facility according to a third embodiment of the present invention.

FIG. 6 is a schematic system configuration diagram of a single-shaft combined turbine facility according to a fourth embodiment of the present invention.

FIG. 7 is a schematic system configuration diagram of a single-shaft combined turbine facility according to a fifth embodiment of the present invention.

[Explanation of symbols]

 4 Gas Turbine 5 Steam Turbine 6 High Pressure Turbine 7 Medium Pressure Turbine 8 Low Pressure Turbine 9 Exhaust Gas Boiler 10 High Pressure Superheater 11 Medium Pressure Superheater 13 Reheater 15 High Pressure Steam Line 16 Reheat Line 17 Medium Pressure Steam Line 18 Condenser 29 High pressure flow control valve 30 Medium pressure flow control valve 31 Second steam introduction path 32,56 High temperature steam line 33,57 Low temperature steam line 34 Second steam line 35 High temperature flow control valve 36 Low temperature flow control valve 37 Temperature detecting means 38 Pressure detection Means 41 Medium-pressure second steam line 42 High-pressure second steam line 43 Medium-pressure electric on-off valve 44 High-pressure electric on-off valve 45 Bypass line 46 On-off valve 51 Recovery line 58, 60 Orifice 59, 61 On-off control on-off valve

Claims (11)

[Claims] An exhaust heat recovery device that connects a gas turbine, a high-pressure side steam turbine, and a low-pressure side steam turbine on a single shaft, recovers exhaust heat of the gas turbine, and generates steam; A high-pressure side path for introducing steam from the high-pressure side steam turbine to the high-pressure side steam turbine, and a low-pressure side path for introducing exhaust steam from the high-pressure side steam turbine and steam from the exhaust heat recovery device to the low-pressure side steam turbine. The single-shaft combined turbine facility according to claim 1, further comprising a second steam introduction path for introducing the second steam into the high-pressure side steam turbine at startup. 2. An exhaust heat recovery device that connects a gas turbine, a high-pressure side steam turbine, and a low-pressure side steam turbine uniaxially, recovers exhaust heat of the gas turbine, and generates steam. A high-pressure side path for introducing steam from the high-pressure side steam turbine to the high-pressure side steam turbine, and a low-pressure side path for introducing exhaust steam from the high-pressure side steam turbine and steam from the exhaust heat recovery device to the low-pressure side steam turbine. A single-shaft combined turbine facility comprising a single-shaft combined turbine facility provided with a second steam introduction path for introducing a second steam into the high-pressure steam turbine and the low-pressure steam turbine at startup. 3. The flow path according to claim 1, wherein the second steam introduction path is provided with a flow rate adjustment path and a temperature adjustment path independently, and the flow rate adjustment path and the temperature adjustment path are provided. Are connected to the introduction side, respectively. 4. The flow path according to claim 1, wherein the second steam introduction path includes a flow rate adjustment introduction path and a temperature adjustment introduction path, and the flow rate adjustment introduction path and the temperature adjustment introduction path. A single-shaft combined turbine facility, characterized in that a plurality of parallel paths are provided for each of the paths, an orifice having a different flow path area is provided for each of the parallel paths, and an on-off valve is provided for each of the parallel paths. 5. The high-pressure side steam turbine according to claim 1, further comprising a condenser provided on a discharge side of the low-pressure side steam turbine, the condenser being introduced from the second steam introduction path to the high-pressure side steam turbine. A single-shaft combined turbine facility comprising a condensing path for introducing the worked steam into the condenser. 6. The recovery method according to claim 1, wherein the steam introduced from the second steam introduction path to the high-pressure side steam turbine and worked is introduced to the low-pressure side steam turbine side. A single-shaft combined turbine facility comprising a path. 7. The introduction according to any one of claims 1 to 6, wherein a plurality of single-shaft combined turbine facilities are provided, and steam from another facility is introduced into the second steam introduction path as second steam. Single-shaft combined turbine equipment characterized by having another can path. 8. The steam turbine according to any one of claims 1 to 6, further comprising a plurality of single-shaft combined turbine equipment, the steam introduced from the second steam introduction path to the high-pressure side steam turbine to perform work. A single-shaft combined turbine facility comprising a discharge other can passage for discharging to a waste heat recovery device in another facility. 9. The introduction according to claim 1, wherein a plurality of single-shaft combined turbine facilities are provided, and steam from another facility is introduced into the second steam introduction path as second steam. And a discharge other can path for discharging the steam introduced from the second steam introduction path to the high-pressure side steam turbine and performing work to an exhaust heat recovery device in another facility. Single-shaft combined turbine equipment. 10. An exhaust heat recovery device that connects a gas turbine, a high-pressure steam turbine, an intermediate-pressure steam turbine, and a low-pressure steam turbine uniaxially, and recovers exhaust heat of the gas turbine to generate steam. A low-pressure side for introducing steam from the heat recovery device to the high-pressure steam turbine, and introducing exhaust steam from the high-pressure steam turbine and steam from the exhaust heat recovery device to the medium-pressure steam turbine; A single-shaft combined turbine equipment comprising a single-shaft combined turbine equipment having a path, wherein a second steam introduction path for introducing a second steam into the high-pressure steam turbine at startup is provided. 11. An exhaust heat recovery device that connects a gas turbine, a high-pressure steam turbine, an intermediate-pressure steam turbine, and a low-pressure steam turbine uniaxially, recovers exhaust heat of the gas turbine, and generates steam, and A high-pressure side path for introducing steam from the heat recovery device to the high-pressure steam turbine,
In a single-shaft combined turbine facility having a low-pressure side path for introducing exhaust steam from the high-pressure steam turbine and steam from the exhaust heat recovery device to the intermediate-pressure steam turbine, the second steam is supplied to the high-pressure steam turbine at startup. And a second steam introduction path for introducing the steam into the medium-pressure steam turbine.