CN218542331U - Control system for bypass regulating valve of steam turbine - Google Patents
Control system for bypass regulating valve of steam turbine Download PDFInfo
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- CN218542331U CN218542331U CN202222085873.XU CN202222085873U CN218542331U CN 218542331 U CN218542331 U CN 218542331U CN 202222085873 U CN202222085873 U CN 202222085873U CN 218542331 U CN218542331 U CN 218542331U
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Abstract
The utility model provides a steam turbine bypass control valve control system, including being used for providing the main gas circuit of driving gas for the bypass governing valve, be provided with the first gas accuse valve and the second gas accuse valve that are used for switching main gas circuit feed through state on the main gas circuit, steam turbine bypass control valve control system still including the supplementary gas circuit that is used for controlling first gas accuse valve and second gas accuse valve operating condition, is provided with solenoid valve and quick vent valve on the supplementary gas circuit. In operating condition, the pipeline between solenoid valve and the first gas accuse valve on the supplementary gas circuit, the second gas accuse valve is longer, when the solenoid valve is closed, gas in the supplementary gas circuit will lead to first gas accuse valve and the action of second gas accuse valve postpone, quick discharge valve's setting can realize the quick exhaust of pipeline between solenoid valve and the first gas accuse valve (or the second gas accuse valve), so that first gas accuse valve or the quick action of second gas accuse valve, and then realize the fast switch-over of bypass control valve state, it leads to the bypass control valve to take place the vibration to have avoided the unstability air feed.
Description
Technical Field
The utility model belongs to the technical field of steam turbine control, especially, relate to a steam turbine bypass governing valve control system.
Background
At present, with the continuous improvement of the national requirement on clean energy, the development of a distributed energy heat supply unit is rapid, a gas combined cycle heat supply unit is often only used as an auxiliary heat supply workshop for industrial production, and a conventional steam turbine bypass system mainly controls the pressure of gas before a high bypass valve so as to realize the normal running and stable operation of the unit, or controls the pressure behind the high bypass valve so as to maintain stable heat supply pressure.
At present, when a bypass adjusting valve of a steam turbine (short for a steam turbine) is controlled, the problems of slow state switching speed of the bypass adjusting valve of the steam turbine and the like exist.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a steam turbine bypass regulating valve control system to realize fast switching of the states of the steam turbine bypass regulating valve.
In order to realize above-mentioned purpose and other relevant purposes, the utility model provides a steam turbine bypass control valve control system, including being used for providing the main gas circuit of driving gas for the bypass control valve, be provided with the first gas accuse valve and the second gas accuse valve that are used for switching main gas circuit connected state on the main gas circuit, steam turbine bypass control valve control system is still including the supplementary gas circuit that is used for controlling first gas accuse valve and second gas accuse valve operating condition, be provided with solenoid valve and quick vent valve on the supplementary gas circuit.
Optionally, the steam turbine bypass regulating valve control system further comprises an air source and an air storage tank connected with the air source, the input ends of the main air path and the auxiliary air path are connected with the output end of the air storage tank, the output end of the auxiliary air path is respectively connected with the first air control valve and the second air control valve, and the output end of the main air path is connected with a driving air cylinder for controlling the bypass regulating valve to work.
Optionally, the auxiliary gas circuit includes an auxiliary main pipe, and a first branch and a second branch connected to an output end of the auxiliary main pipe, an output end of the first branch is connected to the first pneumatic control valve, and an output end of the second branch is connected to the second pneumatic control valve.
Optionally, the solenoid valve includes a first solenoid valve disposed on the first branch, and a second solenoid valve and a third solenoid valve disposed in series on the second branch, and the third solenoid valve is disposed between the second solenoid valve and the second pneumatic control valve.
Optionally, the quick exhaust valve includes a first exhaust valve and a second exhaust valve, the first exhaust valve is disposed between the first solenoid valve and the first pneumatic control valve, and the second exhaust valve is disposed between the third solenoid valve and the second pneumatic control valve.
Optionally, a pneumatic reversing valve which is automatically stopped when the flow rate of the passing gas is lower than a preset value is arranged on the auxiliary main pipe, and an output end of the pneumatic reversing valve is connected with an input end of the first branch and an input end of the second branch.
Optionally, the input ends of the main air path and the auxiliary air path are provided with air filtering pressure reducing valves.
Optionally, the steam turbine bypass regulating valve control system further includes a pneumatic accelerator, a gas input end of the pneumatic accelerator is communicated with the main gas path, and a gas output end of the pneumatic accelerator is connected with the evacuation port of the first exhaust valve.
Optionally, a feedback device is arranged between the driving cylinder and the bypass regulating valve, a valve positioner is connected to the feedback device, and an output end of the valve positioner is connected to the pneumatic accelerator.
As described above, the utility model discloses a steam turbine bypass governing valve control system has following beneficial effect:
in operating condition, the pipeline between solenoid valve and the first gas accuse valve on the supplementary gas circuit, the second gas accuse valve is longer, when the solenoid valve is closed, gas in the supplementary gas circuit will lead to first gas accuse valve and the action of second gas accuse valve postpone, quick discharge valve's setting can realize the quick exhaust of pipeline between solenoid valve and the first gas accuse valve (or the second gas accuse valve), so that first gas accuse valve or the quick action of second gas accuse valve, and then realize the fast switch-over of bypass control valve state, it leads to the bypass control valve to take place the vibration to have avoided the unstability air feed.
Drawings
Fig. 1 is a schematic structural diagram of a control system of a bypass regulating valve of a steam turbine in an embodiment of the present invention.
Fig. 2 is a schematic diagram of a state of the steam turbine bypass control system in an embodiment of the present invention when the bypass control valve is in a fully open state.
Fig. 3 is a schematic state diagram of a control system of a bypass regulating valve of a steam turbine in a fully closed state of the bypass regulating valve according to an embodiment of the present invention.
Fig. 4 is the schematic diagram of the state of the steam turbine bypass regulating valve control system when the air pressure in the auxiliary air path is lower than the preset value in the embodiment of the present invention.
Fig. 5 is a schematic state diagram of a steam turbine bypass regulating valve control system when the bypass regulating valve adjusts any opening degree in the embodiment of the present invention.
Detailed Description
Reference numerals in the drawings of the specification include: the pneumatic control system comprises an air storage tank 1, a main air path 2, an auxiliary air path 3, a pneumatic reversing valve 4, a first electromagnetic valve 5, a second electromagnetic valve 6, a third electromagnetic valve 7, a first exhaust valve 8, a second exhaust valve 9, a first pneumatic control valve 10, a second pneumatic control valve 11, a driving air cylinder 12, a bypass adjusting valve 13, a feedback device 14, a pneumatic accelerator 15, a valve positioner 16 and an air filtering pressure reducing valve 17.
The following description is given for illustrative embodiments of the present invention, and other advantages and effects of the present invention will be apparent to those skilled in the art from the disclosure of the present invention.
The application provides a steam turbine bypass regulating valve control system, refer to fig. 1-5. The arrows in the figure point in the direction of the air flow.
In an exemplary embodiment, a steam turbine bypass regulating valve control system is provided, which includes a main gas path 2 for providing driving gas for a bypass regulating valve 13, a first pneumatic control valve 10 and a second pneumatic control valve 11 for switching the communication state of the main gas path 2 are disposed on the main gas path 2, an auxiliary gas path 3 for controlling the working state of the first pneumatic control valve 10 and the second pneumatic control valve 11, and an electromagnetic valve and a quick exhaust valve are disposed on the auxiliary gas path 3.
It is worth mentioning that, in an actual working condition, the pipeline between the electromagnetic valve on the auxiliary air path 3 and the first air control valve 10 and the second air control valve 11 is long, when the electromagnetic valve is closed, the gas in the auxiliary air path 3 will cause the first air control valve 10 and the second air control valve 11 to act in a delayed manner, and the arrangement of the quick exhaust valve can realize quick exhaust of the pipeline between the electromagnetic valve and the first air control valve 10 (or the second air control valve 11), so that the first air control valve 10 or the second air control valve 11 acts quickly, and further realize quick switching of the state of the bypass regulating valve 13, and avoid the situation that the bypass regulating valve 13 vibrates due to unstable gas supply.
In an exemplary embodiment, the control system of the bypass regulating valve 13 of the steam turbine further includes an air source and an air storage tank 1 connected with the air source, input ends of a main air path 2 and an auxiliary air path 3 are connected with output ends of the air storage tank 1, an output end of the auxiliary air path 3 is respectively connected with a first air control valve 10 and a second air control valve 11, and an output end of the main air path 2 is connected with a driving cylinder 12 for controlling the operation of the bypass regulating valve 13.
Illustratively, the air storage tank 1 is arranged to avoid the vibration phenomenon of the first pneumatic control valve 10, the second pneumatic control valve 11 and the bypass regulating valve 13 when the air supply of the air source is unstable.
Illustratively, an input end A of the air storage tank 1 is connected with an air source, and an output end B of the air storage tank 1 is connected with the main air path 2 and the auxiliary air path 3.
In an exemplary embodiment, the auxiliary air path 3 includes an auxiliary main pipe, and a first branch and a second branch connected to an output end of the auxiliary main pipe, an output end of the first branch is connected to the first pneumatic control valve 10, and an output end of the second branch is connected to the second pneumatic control valve 11.
It is worth to be noted that, in the present application, the first pneumatic control valve 10 and the second pneumatic control valve 11 are controlled by different branches, so as to control the first pneumatic control valve 10 and the second pneumatic control valve 11 to act respectively according to the control requirement.
Illustratively, the output end of the first branch is communicated with the cylinder cavity of the first pneumatic control valve 10, and the output end of the second branch is communicated with the cylinder cavity of the second pneumatic control valve 11.
In an exemplary embodiment, the solenoid valves include a first solenoid valve 5 disposed on the first branch and a second solenoid valve 6 and a third solenoid valve 7 disposed in series on the second branch, the third solenoid valve 7 being disposed between the second solenoid valve 6 and the second pneumatic control valve 11.
It is worth mentioning that the first solenoid valve 5, the second solenoid valve 6 and the third solenoid valve 7 are operated according to different control conditions. For example, when the bypass regulating valve 13 needs to be controlled to be fully opened, the first solenoid valve 5, the second solenoid valve 6 and the third solenoid valve 7 are controlled to be opened, and when the bypass regulating valve 13 needs to be controlled to be fully closed, the second solenoid valve 6 or the third solenoid valve 7 is controlled to be closed.
For example, as shown in fig. 2, when the bypass regulating valve 13 is controlled to be fully opened, the first solenoid valve 5, the second solenoid valve 6 and the third solenoid valve 7 are controlled to be opened, and the air flow reaches the first pneumatic control valve 10 through the first branch, so that the piston in the first pneumatic control valve 10 acts, and the input end P and the output end a of the first pneumatic control valve 10 are communicated, that is, the main air path 2 is communicated with the second pneumatic control valve 11. Similarly, the air flow reaches the second pneumatic control valve 11 through the second branch, so that the piston in the second pneumatic control valve 11 acts, the input end P and the output end a of the second pneumatic control valve 11 are communicated, that is, the main air path 2 is communicated with the driving cylinder 12 for controlling the action of the bypass regulating valve 13, so that the driving cylinder 12 is used for air intake, and the bypass regulating valve 13 is driven to be fully opened.
For example, as shown in fig. 3, when the bypass regulating valve 13 is controlled to be fully closed (or one of the second solenoid valve 6 and the third solenoid valve 7 is damaged), the second solenoid valve 6 or the third solenoid valve 7 is controlled to be closed, the first solenoid valve 5 is opened, the input end P and the output end a of the first pneumatic control valve 10 are communicated, and the second solenoid valve 6 is closed due to the lack of power for pushing the internal piston of the second solenoid valve 6, at which time, the gas in the main gas path 2 cannot reach the driving cylinder 12 through the second solenoid valve 6. At this time, the output end a of the second pneumatic control valve 11 is controlled to be communicated with the evacuation port R, so that the gas in the driving cylinder 12 is discharged, and the bypass electromagnetic valve can be fully closed.
In an exemplary embodiment, the quick exhaust valves include a first exhaust valve 8 and a second exhaust valve 9, the first exhaust valve 8 being disposed between the first solenoid valve 5 and a first pneumatic valve 10, the second exhaust valve 9 being disposed between the third solenoid valve 7 and a second pneumatic valve 11.
It should be noted that the first exhaust valve 8 is arranged so that the first pneumatic control valve 10 is switched to the cut-off state quickly to prevent the first pneumatic control valve 10 from vibrating. The second exhaust valve 9 is arranged so that the second pneumatic control valve 11 can be switched to a cut-off state quickly to avoid the second pneumatic control valve 11 from shaking. Thereby avoiding the bypass adjusting valve 13 from shaking.
In an exemplary embodiment, the auxiliary manifold is provided with a pneumatic directional valve 4 which automatically closes when the flow rate of the passing gas is lower than a preset value, and the output end of the pneumatic directional valve 4 is connected with the input end of the first branch and the input end of the second branch.
It should be noted that the pneumatic directional valve 4 is configured to automatically close when the passing air pressure is lower than a preset value, so as to avoid the vibrations of the first pneumatic control valve 10 and the second pneumatic control valve 11 caused by unstable air flow.
Illustratively, when the gas source fails to output gas, the amount of gas in the gas storage tank 1 is continuously reduced, so that the gas pressure flowing through the reversing valve is lower than a preset value, and the pneumatic reversing valve 4 is closed.
For example, as shown in fig. 4, under normal conditions, the air pressure in the auxiliary air path 3 is 500KPa, when the air pressure in the auxiliary air path 3 drops to 250KPa, the pneumatic directional valve 4 is closed and exhausts air to the outside, the first pneumatic control valve 10 and the second pneumatic control valve 11 are closed, and the exhaust port R of the first pneumatic control valve 10 exhausts air, so that the main air path 2 cannot be communicated with the driving cylinder 12, and the bypass regulating valve 13 is closed.
In an exemplary embodiment, the input ends of the primary and secondary air circuits 2, 3 are provided with air filter pressure relief valves 17.
It is worth noting that the air filter pressure reducing valve 17 is arranged to control the amount of air flowing through the solenoid valve to meet the control demand.
In an exemplary embodiment, the control system of the turbine bypass regulating valve 13 further includes a pneumatic accelerator 15, a gas input end of the pneumatic accelerator 15 is communicated with the main gas path 2, and a gas output end of the pneumatic accelerator 15 is connected with the evacuation port of the first exhaust valve 8.
For example, as shown in fig. 5, when it is required to realize the control of any opening degree of the bypass regulating valve 13, the first electromagnetic valve 5 is controlled to be closed, and the second electromagnetic valve 6 and the third electromagnetic valve 7 are controlled to be opened, so that the input end P of the first pneumatic control valve 10 cannot be communicated with the output end a, and the input end P of the second pneumatic control valve 11 is communicated with the output end a. At this time, the output end a of the first pneumatic control valve 10 is controlled to be connected with the evacuation port R, so that the gas in the driving cylinder 12 enters the pneumatic control accelerator after passing through the second pneumatic control valve 11 and the first pneumatic control valve 10, and the amount of gas reaching the driving cylinder 12 is controlled according to the discharge amount of the gas in the pneumatic control accelerator, thereby achieving the purpose of adjusting the opening degree of the bypass adjusting valve 13.
In an exemplary embodiment, a feedback device 14 is disposed between the driving cylinder 12 and the bypass regulating valve 13, a valve positioner 16 is connected to the feedback device 14, and an output end of the valve positioner 16 is connected to a pneumatic accelerator 15.
Illustratively, the valve positioner 16 is triggered to output a signal according to the feedback result of the feedback device 14, and the gas discharge amount of the pneumatically-controlled accelerator is controlled according to the output signal of the valve positioner 16.
Illustratively, the output end OUT of the valve positioner 16 is connected to the SIC end of the pneumatic accelerator 15, the input end IN of the valve positioner 16 is communicated with the input end IN of the pneumatic accelerator 15 and the main air passage 1, and the output end OUT of the pneumatic accelerator is communicated with the evacuation port R of the first pneumatic valve 10. The input end P and the output end A of the first pneumatic control valve 10 and the second pneumatic control valve 11 are connected to the main gas circuit 2.
Illustratively, the solenoid valve and the valve positioner 16 are both connected to a controller for controlling the operation thereof, the controller outputs digital quantity to control the operation of the solenoid valve, and the controller outputs analog quantity to control the operation of the valve positioner 16. The valve positioner 16 compares the controller output with the value output by the feedback 14 and outputs a signal to control the operation of the pneumatic accelerator 15 when the value falls below a preset value.
Illustratively, the controller may be a PLC.
The above embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. It will be apparent to those skilled in the art that modifications and variations can be made to the above-described embodiments without departing from the spirit and scope of the invention, and it is intended that all equivalent modifications and variations be covered by the appended claims without departing from the spirit and scope of the invention.
Claims (9)
1. The steam turbine bypass regulating valve control system is characterized by comprising a main air path for providing driving air for a bypass regulating valve, wherein a first air control valve and a second air control valve which are used for switching the communication state of the main air path are arranged on the main air path, the steam turbine bypass regulating valve control system further comprises an auxiliary air path for controlling the working states of the first air control valve and the second air control valve, and an electromagnetic valve and a quick exhaust valve are arranged on the auxiliary air path.
2. The steam turbine bypass regulating valve control system according to claim 1, further comprising a gas source and a gas storage tank connected to the gas source, wherein input ends of the main gas circuit and the auxiliary gas circuit are connected to an output end of the gas storage tank, an output end of the auxiliary gas circuit is connected to the first pneumatic control valve and the second pneumatic control valve, and an output end of the main gas circuit is connected to a driving cylinder for controlling the bypass regulating valve to operate.
3. The steam turbine bypass regulating valve control system according to claim 2, wherein the auxiliary gas path comprises an auxiliary main pipe, and a first branch and a second branch which are connected to the output end of the auxiliary main pipe, the output end of the first branch is connected with the first pneumatic control valve, and the output end of the second branch is connected with the second pneumatic control valve.
4. The steam turbine bypass regulator valve control system according to claim 3, wherein the solenoid valve includes a first solenoid valve disposed on a first branch and a second solenoid valve and a third solenoid valve disposed in series on a second branch, the third solenoid valve being disposed between the second solenoid valve and the second pneumatic control valve.
5. The steam turbine bypass modulation valve control system of claim 4, wherein the quick exhaust valve comprises a first exhaust valve disposed between the first solenoid valve and a first pneumatic valve and a second exhaust valve disposed between the third solenoid valve and a second pneumatic valve.
6. The steam turbine bypass regulating valve control system according to claim 3, wherein a pneumatic reversing valve which automatically stops when the flow rate of the passing gas is lower than a preset value is arranged on the auxiliary manifold, and an output end of the pneumatic reversing valve is connected with an input end of the first branch and an input end of the second branch.
7. The steam turbine bypass regulator valve control system of claim 1, wherein the input ends of the main and auxiliary gas circuits are provided with air filter pressure relief valves.
8. The steam turbine bypass regulating valve control system according to claim 5, further comprising a pneumatic accelerator, a gas input end of the pneumatic accelerator being communicated with the main gas path, and a gas output end of the pneumatic accelerator being connected to a drain port of the first exhaust valve; and the gas input end of the pneumatic accelerator is communicated with the main gas path.
9. The steam turbine bypass regulating valve control system according to claim 8, wherein a feedback device is arranged between the driving cylinder and the bypass regulating valve, a valve positioner is connected to the feedback device, and an output end of the valve positioner is connected with the pneumatic accelerator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222085873.XU CN218542331U (en) | 2022-08-09 | 2022-08-09 | Control system for bypass regulating valve of steam turbine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222085873.XU CN218542331U (en) | 2022-08-09 | 2022-08-09 | Control system for bypass regulating valve of steam turbine |
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| Publication Number | Publication Date |
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| CN218542331U true CN218542331U (en) | 2023-02-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222085873.XU Active CN218542331U (en) | 2022-08-09 | 2022-08-09 | Control system for bypass regulating valve of steam turbine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115263445A (en) * | 2022-08-09 | 2022-11-01 | 中广核工程有限公司 | Method for controlling action of bypass regulating valve of steam turbine |
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2022
- 2022-08-09 CN CN202222085873.XU patent/CN218542331U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115263445A (en) * | 2022-08-09 | 2022-11-01 | 中广核工程有限公司 | Method for controlling action of bypass regulating valve of steam turbine |
| CN115263445B (en) * | 2022-08-09 | 2024-10-01 | 中广核工程有限公司 | Action control method for bypass regulating valve of steam turbine |
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