JP3769836B2 - Humidification tower switching device for humid air gas turbine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a humidifying tower switching device for a humid air gas turbine.
[0002]
[Prior art]
FIG. 4 shows an example of a conventional humid air gas turbine. On the same shaft 1, a low pressure air compressor 2, a high pressure air compressor 3, a high pressure gas turbine 4, and a low pressure gas turbine 5 are shown. And a generator 6 is connected to the end of the shaft 1.
[0003]
Air is sucked into the low-pressure air compressor 2 and compressed, and the compressed air 7 compressed by the low-pressure air compressor 2 is guided to the high-pressure air compressor 3 and further compressed. It is connected to the outlet of the high-pressure air compressor 3 and is introduced into the humidification tower 10 via a compressor outlet-side passage 9 provided with an outlet-side switching control valve 8 in the middle.
[0004]
The humidification tower 10 supplies the steam 11a to the compressed air 7 so as to wet the compressed air 7 and increase its volume. A cooler 11 is provided between the low-pressure air compressor 2 and the high-pressure air compressor 3 and exchanges heat between the compressed air 7 and water. The cooler 11 cools the compressed air 7 to cool the high-pressure air compressor 3. At the same time, the vaporized vapor 11a is supplied to the humidifying tower 10.
[0005]
Compressed air 7 ′, which has been mixed with steam 11 a in the humidification tower 10 and becomes humid air, is combusted via the inlet-side switching control valve 12 by the turbine inlet-side flow path 13 connected to the outlet of the humidification tower 10. 14 is combusted with fuel 15 such as gas or oil supplied to the combustor 14, and becomes high-temperature / high-pressure gas 16, which is led to the high-pressure gas turbine 4 to perform work. Yes.
[0006]
The gas 16 exiting the high-pressure gas turbine 4 is guided to the low-pressure gas turbine 5 for further work, and if necessary, is subjected to heat recovery with a heat recovery device (not shown) or the like and then discharged as exhaust gas. It is like that.
[0007]
Further, when the humid air gas turbine is started, the steam 11a is not obtained, so that the humidifying tower 10 cannot be used. Therefore, the operation of the simple cycle C ₁ can be performed.
[0008]
That is, an intermediate flow path 18 that communicates the outlet of the high-pressure air compressor 3 between the inlet-side switching control valve 12 of the turbine inlet-side flow path 13 and the combustor 14 is provided, and intermediate switching control is performed in the intermediate flow path 18. A valve 17 is provided. In the figure, 19 is provided at the outlet of the inlet side switching control valve 12 of the turbine inlet side channel 13 so that the compressed air 7 of the intermediate channel 18 does not flow backward toward the humidifying tower 10 when the inlet side switching control valve 12 is opened. Check valve.
[0009]
When the humid air gas turbine shown in FIG. 4 is started, the operation of the simple cycle C ₁ without using the humidifying tower 10 is performed. During the operation of the simple cycle C ₁ , the outlet side switching control valve 8 and the input switch The side switching control valve 12 is fully closed, and the intermediate switching control valve 17 is fully opened.
[0010]
As a result, the compressed air 7 that has been compressed by taking in the atmosphere in the low-pressure air compressor 2 is further compressed by the high-pressure air compressor 3 to be increased in pressure, and then introduced into the combustor 14 via the intermediate flow path 18. The gas 16, which is burned together with the fuel 15 and becomes high temperature and high pressure by the combustion, is sequentially guided to the high pressure gas turbine 4 and the low pressure gas turbine 5 for driving.
[0011]
When switching from the operation of the simple cycle C ₁ not using the humidifying tower 10 to the operation of the humid air cycle C ₂ using the humidifying tower 10, the outlet side switching control valve 8 and the inlet side switching control valve 12 are used. At the same time, the intermediate switching control valve 17 is gradually closed. Thereby, the volume of the compressed air 7 from the high pressure air compressor 3 is increased by being guided to the humidification tower 10 and mixing the steam 11a. The compressed air 7 ′ (humid air) whose volume is increased by mixing the steam 11 a in this way becomes a gas 16 whose pressure is further increased by being burned in the combustor 14, and the high pressure gas turbine 4 and By being guided to the low-pressure gas turbine 5, the high-pressure gas turbine 4 and the low-pressure gas turbine 5 are driven with high efficiency.
[0012]
[Problems to be solved by the invention]
However, as described above, in the humid air gas turbine of FIG. 4, when switching from the operation of the simple cycle C ₁ not using the humidifying tower 10 to the operation of the humid air cycle C ₂ using the humidifying tower 10, The switching control valve 8 and the inlet side switching control valve 12 are gradually opened and the intermediate switching control valve 17 is gradually closed. The inside of the humidifying tower 10 is at substantially atmospheric pressure and the temperature is low. Further, since the humidifying tower 10 has a considerably large capacity, a large amount of compressed air 7 from the high pressure air compressor 3 flows to the humidifying tower 10 simultaneously with the start of the opening operation of the outlet side switching control valve 8. For this reason, the pressure of the compressed air 7 supplied to the combustor 14 via the intermediate flow path 18 rapidly decreases, and thereby the pressure of the gas 16 after being combusted by the combustor 14 also decreases. So high pressure gas The turbine outputs of the turbine 4 and the low-pressure gas turbine 5 are abruptly reduced, which causes a problem that the output of the generator 6 fluctuates.
[0013]
When the operation of the humid air cycle C ₂ using the humidifying tower 10 is switched to the operation of the simple cycle C ₁ not using the humidifying tower 10, it is supplied to the combustor 14 as described above. There is no problem that the pressure of the compressed air 7 is rapidly reduced.
[0014]
The present invention prevents the pressure of the compressed air at the combustor inlet from being lowered and the gas turbine output from being lowered when switching from the operation not using the humidification tower to the operation using the humidification tower. It is an object of the present invention to provide a humidifying tower switching device for a humid air gas turbine.
[0015]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a compressor outlet side passage for communicating the outlet of the high-pressure air compressor to the inlet of the humidifying tower via the outlet side switching control valve, and the inlet side switching control of the outlet of the humidifying tower. Turbine inlet side flow path connected to the inlet of the high pressure gas turbine through the valve and the combustor in sequence, and the outlet side of the high pressure air compressor through the intermediate switching control valve and the inlet side switching control valve of the turbine inlet side flow path and combustion A humidifying tower switching device for a humid air gas turbine having an intermediate flow path communicating with the compressor, comprising a bypass flow path that bypasses the outlet switching control valve in the compressor outlet flow path, and A humidifying tower switching device for a humidified air gas turbine, characterized in that the bypass passage is provided with a small flow rate valve for increasing the pressure of the humidifying tower capable of supplying a part of the compressed air at the outlet of the high pressure air compressor to the humidifying tower. , Related to
[0016]
According to a second aspect of the present invention, there is provided a valve opening / closing detector that detects opening / closing of a small flow rate valve for boosting the humidifying tower, a humidifying tower pressure detector that detects the pressure of the humidifying tower, and a turbine inlet-side flow path. An inlet side pressure detector that detects the outlet pressure of the inlet side switching control valve and a small flow rate valve opening signal from the valve opening / closing detector while opening the small flow rate valve for increasing the pressure in the humidifying column in response to a command to start increasing the pressure in the humidifying column Is input and the outlet side switching control valve and the inlet side switching control valve are opened when the humidifying tower detected pressure from the humidifying tower pressure detector becomes higher than the combustor inlet detected pressure of the inlet pressure detector. And a controller that closes the intermediate switching control valve and closes the small-flow valve for boosting the humidification tower after a set time has elapsed. The present invention relates to a humidifying tower switching device.
[0017]
In the first aspect of the present invention, when switching from the operation not using the humidification tower to the operation using the humidification tower, the small flow valve for increasing the pressure in the humidification tower is opened and the high pressure is passed through the bypass passage. A portion of the compressed air from the air compressor is supplied to the humidification tower little by little so that the internal pressure of the humidification tower can be gradually increased. If the switching is performed when the internal pressure becomes high, the pressure of the compressed air at the combustor inlet does not decrease during the switching, and therefore the outputs of the high-pressure gas turbine and the low-pressure gas turbine decrease during the switching. Can prevent problems.
[0018]
According to the second aspect of the present invention, the humidifying tower boosting small flow valve is opened by the humidifying tower boosting start command, the small flow valve opening signal from the valve opening / closing detector is input, and the humidification is increased. When the humidifying tower detection pressure from the tower pressure detector becomes higher than the combustor inlet detection pressure of the inlet pressure detector, the outlet switching control valve and the inlet switching control valve are opened and the intermediate switching control valve is opened. Is closed, and after the set time has elapsed, the controller that closes the small flow valve for boosting the humidification tower is equipped, so the operation to switch between the operation without using the humidification tower and the operation using the humidification tower is automatic. And stable.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0020]
FIG. 1 shows an example of an embodiment of the present invention applied to the conventional humid air gas turbine shown in FIG. 4, in which the same reference numerals as those in FIG. 4 denote the same components. .
[0021]
As shown in FIG. 1, in the humid air gas turbine similar to the configuration shown in FIG. 4, the compressor outlet side passage 9 includes a bypass passage 20 for bypassing the outlet side switching control valve 8, and the bypass Prior to the use of the humidifying tower 10, a part of the compressed air 7 at the outlet of the high pressure air compressor 3 is supplied to the humidifying tower 10 to increase the pressure of the humidifying tower 10. A small-flow valve 21 for boosting the wet tower is provided.
[0022]
The humidifying tower pressurizing small flow rate valve 21 is 1/100 to 1/1000 of the flow rate of the compressed air 7 flowing through the compressor outlet side passage 9 when the outlet side switching control valve 8 is fully opened when it is fully opened. It is a small-capacity valve that allows a flow rate of a certain level to flow.
[0023]
In FIG. 1, reference numeral 24 denotes a controller that controls opening and closing of the outlet side switching control valve 8, the inlet side switching control valve 12, the intermediate switching control valve 17, and the humidifying tower boosting small flow valve 21.
[0024]
The controller 24 includes a small flow valve opening signal 26 from a valve opening / closing detector 25 that detects the opening / closing of the small flow valve 21 for boosting the humidifying tower by a limit switch and the pressure inside the humidifying tower 10. Humidification tower detection pressure P ₁ from the humidification tower pressure detector 27 to be detected, and combustion from the inlet side pressure detector 28 provided at the outlet of the inlet side switching control valve 12 in the turbine inlet side flow path 13. The apparatus inlet detection pressure P ₀ is input, and the humidification tower pressure increase start command 29 and the plant stop command 30 are further input.
[0025]
FIG. 2 is a logic circuit diagram showing an example of the circuit of the controller 24. The controller 24 includes a hold circuit 31 having a set S side and a reset R side, a 100% signal on the a side, and b. When the humidifying tower boost start command 29 is issued to the controller 24, the switch 32 is turned on by the set S side of the hold circuit 31. The signal 33 continues to be output, whereby the switch 32 is switched to output the 100% signal on the a side, and the humidification tower boosting small flow valve 21 is fully opened. When the signal 45 is input to the reset R side of the hold circuit 31, the ON signal 33 disappears due to the reset, and the switch 32 is switched so as to output the 0% signal on the b side. Thus, the humidification tower pressurizing small flow valve 21 is fully closed.
[0026]
The controller 24 is supplied with the humidifying tower detection pressure P ₁ from the humidifying tower pressure detector 27 and the combustor inlet detection pressure P ₀ from the inlet pressure detector 28, and detects the humidifying tower. A comparator 35 that compares the pressure P ₁ with the combustor inlet detection pressure P ₀ and outputs an ON signal 34 when P ₁ > P ₂ is provided, and further includes an ON signal 34 from the comparator 35. As described above, when the small flow valve 21 for boosting the humidifying tower is fully opened, when the small flow valve opening signal 26 from the valve opening / closing detector 25 is input, the ON signal 36 is output. An AND circuit 37 is provided.
[0027]
2, 38 is a hold circuit having a set S side and a reset R side. When the ON signal 36 from the AND circuit 37 is input to the set S side of the hold circuit 38, the hold circuit 38 is An ON signal 39 is continuously output.
[0028]
Reference numeral 40 denotes a switch to which a 100% signal on the a side and a 0% signal on the b side are input. When the ON signal 39 from the hold circuit 38 is input to the switch 40, a 100% signal is input. Is switched to output a 0% signal when the ON signal 39 from the hold circuit 38 disappears. The 100% signal or the 0% signal switched by the switcher 40 is simultaneously output to the outlet side switching control valve 8 and the inlet side switching control valve 12 via the change rate limiter 41. The side switching control valve 8 and the inlet switching control valve 12 are controlled to be opened and closed simultaneously at a required change rate set in the change rate limiter 41.
[0029]
Reference numeral 42 denotes a switch to which a 0% signal on the a side and a 100% signal on the b side are input. When the ON signal 39 from the hold circuit 38 is input to the switch 42, the 0% signal is input. Is switched to output a 100% signal when the ON signal 39 from the hold circuit 38 disappears. The 0% signal or 100% signal switched by the switcher 42 is output to the intermediate switching control valve 17 via the change rate limiter 43, and the intermediate switch control valve 17 receives the change rate limiter. Opening and closing is controlled at a required rate of change set in the container 43.
[0030]
Further, a timer 44 to which the ON signal 39 from the hold circuit 38 is input is provided. The timer 44 outputs the signal 45 after a predetermined time has elapsed after the ON signal 39 is input. Is output to the reset R side to reset the hold circuit 31. As a result, the ON signal 33 from the hold circuit 31 disappears, so the switcher 32 switches to output a 0% signal. Accordingly, the humidification tower pressurizing small flow valve 21 is fully closed.
[0031]
The plant stop command 30 is input to the reset R side of the hold circuit 38. When the plant stop command 30 is input to the reset R side of the hold circuit 38 when the plant is stopped, the hold circuit 38 As a result, the ON signal 39 from the hold circuit 38 disappears, whereby the switcher 40 is switched to output a 0% signal, and the output side switching control valve 8 and the input side switching control valve 12 are switched. At the same time, it is fully closed, and at the same time, the switch 42 is switched to output a 100% signal, and the intermediate switching control valve 17 is fully opened.
[0032]
Next, the operation of the above embodiment will be described.
[0033]
FIG. 3 is a diagram showing the operation of the embodiment. In the humid air gas turbine of FIG. 1, the outlet side switching control valve 8 and the inlet side switching control valve 12 are fully closed, and the intermediate switching control valve. As described above, the outlet side switching control valve 8 and the inlet side switching control valve 12 are turned on while the motor 17 is fully opened and the operation of the simple cycle C ₁ not using the humidifying tower 10 is performed (for example, at the time of startup). By being fully closed, the inside of the humidification tower 10 is substantially at atmospheric pressure. Therefore, as shown by the broken line in FIG. 3, the humidifying tower detection pressure P ₁ of the humidifying tower pressure detector 27 is low, and the combustor inlet detection pressure P ₀ of the inlet pressure detector 28 is high as shown by the solid line. High pressure is obtained by the compressed air 7 from the air compressor 3.
[0034]
When the turbine output is increased from the above state by switching to the humid air cycle C ₂ using the humidifying tower 10, the humidifying tower pressure increase start command 29 is input to the controller 24.
[0035]
Then, as shown in FIG. 2, the hold circuit 31 outputs an ON signal 33 to the switch 32 in response to the humidification tower boost start command 29, whereby the switch 32 outputs the 100% signal on the a side to the boost tower boost. Is output to the small flow rate valve 21 and the humidification tower pressurizing small flow rate valve 21 is opened as shown in FIG. When the humidifying tower boosting small flow valve 21 is fully opened, the valve opening / closing detector 25 outputs a small flow valve opening signal 26 to the AND circuit 37 of the controller 24 as shown in FIG.
[0036]
When the small flow valve 21 for pressurizing the humidifying tower is opened, a part of the compressed air 7 from the high-pressure air compressor 3 is supplied to the humidifying tower 10 little by little through the bypass passage 20 as shown in FIG. As a result, the internal pressure of the humidification tower 10 gradually increases.
[0037]
At this time, since the flow rate of the compressed air 7 flowing through the bypass passage 20 is very small even if the humidifying tower pressurizing small flow valve 21 is opened, the pressure of the compressed air 7 supplied to the combustor 14 decreases. Therefore, the outputs of the high-pressure gas turbine 4 and the low-pressure gas turbine 5 are not reduced.
[0038]
The pressure in the humidifying tower 10 is increased by opening the small flow valve 21 for increasing the pressure in the humidifying tower, and the pressure in the humidifying tower 10 is further increased by supplying the steam 11a. A reverse phenomenon occurs in which the tower detection pressure P ₁ becomes higher than the combustor inlet detection pressure P ₀ .
[0039]
In this way, when the humidification tower detection pressure P ₁ becomes higher than the combustor inlet detection pressure P ₀ , the comparator 35 in FIG. 2 outputs an ON signal 34 to the AND circuit 37 due to P ₁ > P ₀ . At this time, since the small flow rate valve opening signal 26 from the valve opening / closing detector 25 is input to the AND circuit 37 as described above, the ON signal 36 is output from the AND circuit 37 to the hold circuit 38. As a result, the hold circuit 38 continues to output the ON signal 39.
[0040]
When the ON signal 39 is generated from the hold circuit 38, the switch 40 is switched to output the 100% signal on the a side, and the change rate limiter 41 receiving this 100% signal receives the required change rate L. ₁ (FIG. 3), the outlet side switching control valve 8 and the inlet side switching control valve 12 are simultaneously opened to be fully opened.
[0041]
At the same time, the switching circuit 42 is switched to output a 0% signal on the a side by the ON signal 39 from the hold circuit 38, and the change rate limiter 43 receiving this 0% signal receives the required change rate L _2. In FIG. 3, the intermediate switching control valve 17 is closed and fully closed.
[0042]
Further, an ON signal 39 from the hold circuit 38 is input to the timer 44, and the timer 44 outputs a signal 45 to the reset R side of the hold circuit 31 after a predetermined time has elapsed since the ON signal 39 was input. The hold circuit 31 is reset. By this reset, the ON signal 33 from the hold circuit 31 disappears, so that the switcher 32 is switched to output the 0% signal on the b side to the humidifying tower boosting small flow valve 21, The small flow valve 21 is fully closed.
[0043]
At this time, as shown in FIG. 3, the timer 44 fully opens the outlet side switching control valve 8 and the inlet side switching control valve 12 after the ON signal 39 is output from the hold circuit 38, and the intermediate switching control valve 17 is turned on. The set time T is set so that the small flow valve 21 for pressurization of the humidifying tower is fully closed after the fully closed is completed.
[0044]
Further, when the plant is stopped, the plant stop command 30 is input to the reset R side of the hold circuit 38, so that the hold circuit 38 is reset, so that the ON signal 39 from the hold circuit 38 disappears. Accordingly, the switching device 40 is switched so as to output a 0% signal so that the output side switching control valve 8 and the input side switching control valve 12 are fully closed simultaneously, and at the same time, the switching device 42 outputs a 100% signal. Thus, the intermediate switching control valve 17 is fully opened. As described above, when the plant is stopped, the state is automatically switched to the state of the simple cycle C ₁ in which the humidification tower 10 is not used.
[0045]
【The invention's effect】
According to the first aspect of the present invention, when switching from the operation not using the humidification tower to the operation using the humidification tower, the small flow valve for increasing the pressure in the humidity tower is opened, and the operation is performed via the bypass channel. Therefore, a part of the compressed air from the high-pressure air compressor is supplied to the humidification tower little by little so that the internal pressure of the humidification tower can be gradually increased. If the switching is performed when the pressure inside the humidifier becomes high, the pressure of the compressed air supplied to the combustor at the time of switching can be prevented from decreasing. The effect which can prevent the problem that the output of a turbine and a low-pressure gas turbine falls is produced.
[0046]
According to the second aspect of the present invention, the humidifying tower boosting small flow valve is opened by the humidifying tower boosting start command, the small flow valve opening signal from the valve opening / closing detector is input, and the humidification is increased. When the humidifying tower detection pressure from the tower pressure detector becomes higher than the combustor inlet detection pressure of the inlet pressure detector, the outlet switching control valve and the inlet switching control valve are opened and the intermediate switching control valve is opened. Is closed, and after the set time has elapsed, the controller that closes the small flow valve for boosting the humidification tower is equipped, so the operation to switch between the operation without using the humidification tower and the operation using the humidification tower is automatic. The effect that can be performed in a stable and stable manner.
[Brief description of the drawings]
FIG. 1 is an overall block diagram showing an example of an embodiment for carrying out the present invention.
FIG. 2 is a logic circuit diagram of the controller of FIG. 1;
FIG. 3 shows the relationship between the combustor inlet detection pressure and the humidification tower detection pressure in the embodiment of the present invention, and the humidification tower boosting small flow valve, the outlet side switching control valve, the inlet side switching control valve, and the intermediate switching. It is the diagram which showed the relationship with the opening / closing operation | movement of a control valve.
FIG. 4 is an overall block diagram showing an example of a conventional humid air gas turbine.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 3 High pressure air compressor 4 High pressure gas turbine 7 Compressed air 8 Outlet side switching control valve 9 Compressor outlet side channel 10 Humidification tower 12 Inlet side switching control valve 13 Turbine inlet side channel 14 Combustor 17 Intermediate switching control valve 18 Intermediate flow path 20 Bypass flow path 21 Humidification tower boosting small flow valve 24 Controller 25 Valve open / close detector 26 Small flow valve opening signal 27 Humidification tower pressure detector 28 Inlet pressure detector 29 Humidification tower pressure increase start command P ₀ Combustor inlet detection pressure P ₁ Humidification tower detection pressure T Set time

Claims (2)

The outlet of the compressor communicates with the inlet of the humidification tower through the outlet switching control valve at the outlet of the high-pressure air compressor, and the outlet of the humidification tower is pressurized through the inlet switching control valve and the combustor in sequence. A turbine inlet side flow path connected to the inlet of the gas turbine, and an intermediate flow communicating the outlet of the high pressure air compressor between the inlet side switching control valve of the turbine inlet side flow path and the combustor via the intermediate switching control valve A humidifying tower switching device for a humidified air gas turbine, comprising a bypass channel bypassing the outlet switching control valve in the compressor outlet channel, and high-pressure air compression in the bypass channel A humidifying tower switching device for a humidified air gas turbine, comprising a small flow rate valve for boosting the humidifying tower capable of supplying a part of the compressed air at the machine outlet to the humidifying tower. A valve opening / closing detector for detecting the opening / closing of the small flow valve for increasing the pressure in the humidifying tower, a pressure increasing detector for detecting the pressure in the humidifying tower, and an outlet pressure of the inlet side switching control valve in the turbine inlet side flow path. The inlet side pressure detector to detect and the humidification tower pressure increase start command to open the small flow valve for boosting the humidification tower, the small flow valve opening signal from the valve open / close detector is input, and the humidification tower pressure When the detection pressure from the detector is higher than the detection pressure at the combustor inlet of the inlet pressure detector, the outlet switching control valve and the inlet switching control valve are opened and the intermediate switching control valve is closed. The humidifying tower switching device for a humid air gas turbine according to claim 1, further comprising a controller that operates and closes the small flow valve for increasing the pressure of the humidifying tower after a set time has elapsed.

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