CN215057605U - Redundancy control system for regulating steam valve of steam turbine of water supply pump - Google Patents
Redundancy control system for regulating steam valve of steam turbine of water supply pump Download PDFInfo
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- CN215057605U CN215057605U CN202121035573.XU CN202121035573U CN215057605U CN 215057605 U CN215057605 U CN 215057605U CN 202121035573 U CN202121035573 U CN 202121035573U CN 215057605 U CN215057605 U CN 215057605U
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Abstract
The utility model provides a redundant control system of a steam regulating valve of a water supply pump steam turbine, which comprises a hydraulic module and a steam regulating valve servomotor, wherein the hydraulic module is integrated with a double-path direct-drive servo valve consisting of a first servo valve and a second servo valve, oil return pipelines of the first servo valve and the second servo valve are both provided with electromagnetic valves for automatically cutting off two oil paths, outlet sides of the first servo valve and the second servo valve are respectively connected with oil inlet ends corresponding to corresponding isolating electromagnetic valves after being communicated with oil inlet ends corresponding to the isolating electromagnetic valves, and then are respectively connected with oil pipelines for regulating corresponding oil ports of the steam regulating valve servomotor, the utility model discloses a steam regulating valve servomotor adopts independent double-path hydraulic control, two hydraulic control channels are mutually independent and mutually noninterfere, each servo valve is provided with an isolating electromagnetic valve, when in fault, the control oil path can be rapidly cut off through the action of the isolating electromagnetic valve without influencing another normal oil path, when the fault oil way is cut off, the current opening degree of the throttle is not disturbed, and the control function of the throttle is not influenced.
Description
Technical Field
The utility model relates to a steam turbine control technology field, concretely relates to redundant control system of feed pump steam turbine governing steam valve.
Background
When the existing power plant unit is built, a water supply pump turbine is designed to be single 100% capacity configuration due to cost consideration, and high and low pressure valves for controlling a steam-driven water supply pump turbine are both single servo valve fuel-resistant oil control and regulation systems. Because the steam-driven water supply pump set is arranged singly, a standby electric pump is not started, the water supply flow cannot be adjusted due to the fact that a servo valve of a steam turbine of the water supply pump is jammed or damaged in actual operation, and finally the unit is shut down unplanned, so that great potential safety hazards and economic losses are brought to safe and stable operation of the unit. In order to eliminate hidden dangers, the safety and reliability of the water supply pump steam turbine are improved, and the safe and stable operation of the whole unit is guaranteed. Those skilled in the art have provided a redundant control system for a feedwater pump turbine throttle valve to address the problems set forth in the background above.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a redundant control system of steam valve is adjusted to water-feeding pump steam turbine aims at solving how to improve water-feeding pump steam turbine fail safe nature, guarantees the problem of the safety and stability operation of whole unit.
In order to achieve the above object, the utility model provides a following technical scheme: a redundant control system for an adjusting steam valve of a steam turbine of a feed pump comprises a hydraulic module and an oil-operated machine for the adjusting steam valve, the hydraulic module is integrated with a two-way direct drive type servo valve consisting of a first servo valve and a second servo valve, oil return pipelines of the first servo valve and the second servo valve are both provided with electromagnetic valves with the functions of automatically cutting off two oil ways, the oil return pipelines of the first servo valve and the second servo valve are both provided with two manual stop valves, the high-pressure oil inlet end and the pressure oil return end on the inlet sides of the first servo valve and the second servo valve are respectively connected in parallel and then are connected into corresponding pipelines of a high-pressure fuel-resistant station, after the outlet sides of the first servo valve and the second servo valve are communicated with the oil inlet ends corresponding to the isolation solenoid valves, and then respectively connected with oil pipelines for adjusting corresponding oil ports of the gasoline valve oil-operated machine, and the first servo valve and the second servo valve are in signal connection with an MEH control system.
In order to make output servo instruction, accept on-the-spot valve stroke feedback signal and receive fast signal of closing etc. as the utility model relates to an it is preferred: the first servo valve and the second servo valve are both provided with corresponding redundant servo card modules.
In order to make and send valve position control command signal to electro-hydraulic servo valve through the servo card, do the utility model relates to an it is preferred: the two servo card modules are respectively connected with two LVDT stroke feedbacks, the redundant servo cards of the servo card modules are connected by a special redundant line and are respectively connected with the first servo valve and the second servo valve, and the two servo cards are mutually standby.
In order to make and choose suitable servo card for use, as the utility model relates to an it is preferred: the servo card is in a type of K-SV01 and has the characteristic of a redundant working mode, two paths of servo cards work in a hot standby mode, and the switching time of a servo card module is less than or equal to 10 ms.
In order to make the oil to the oil circuit in play the filtering action, conduct the utility model relates to an it is preferred: and oil filters with filter element filtering holes smaller than 5 micrometers are arranged on the oil inlet passages of the first servo valve and the second servo valve.
In order to select a suitable servo valve, it is preferable as a preferred aspect of the present invention that: the first servo valve and the second servo valve are both direct-drive electro-hydraulic servo valves with the model number of D633.
Compared with the prior art, the beneficial effects of the utility model are that:
1) the regulating gasoline valve oil motor adopts independent double-channel hydraulic control, the two hydraulic control channels are mutually independent and do not interfere with each other, each servo valve is provided with an isolating electromagnetic valve, the control oil circuit can be quickly cut off through the action of the isolating electromagnetic valve during fault, the other normal oil circuit is not influenced, and when the fault oil circuit is cut off, the current opening degree of the throttle is not interfered, and the control function of the throttle is not influenced;
2) each servo valve is provided with two manual stop valves, and when a single servo valve fails, an oil way can be isolated for inspection and replacement, and the control function of the adjusting valve is not influenced.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of the redundant design of the hydraulic circuit control part of the present invention;
FIG. 3 is a schematic diagram of the redundant design of the servo valve of the present invention;
fig. 4 is a schematic diagram of the logic configuration design of the controller of the present invention.
In the figure: 1. a hydraulic module; 11. a first servo valve; 12. a second servo valve; 13. an electromagnetic valve; 14. a manual stop valve; 2. adjusting the gasoline valve servomotor; 3. and a servo card module.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Example 1
Referring to fig. 1-4, the present invention provides the following technical solutions: a redundant control system for an adjusting steam valve of a water supply pump steam turbine comprises a hydraulic module 1 and an adjusting steam valve servomotor 2, wherein the hydraulic module 1 is integrated with a two-way direct drive type servo valve consisting of a first servo valve 11 and a second servo valve 12, oil return pipelines of the first servo valve 11 and the second servo valve 12 are respectively provided with an electromagnetic valve 13 with the function of automatically cutting off two oil ways, the oil return pipelines of the first servo valve 11 and the second servo valve 12 are respectively provided with two manual stop valves 14, high-pressure oil inlet ends and pressure oil return ends on inlet sides of the first servo valve 11 and the second servo valve 12 are respectively connected in parallel and then connected into corresponding pipelines of a high-pressure fuel-resistant station, after the outlet sides of the first servo valve 11 and the second servo valve 12 are communicated with the corresponding oil inlet ends of the corresponding isolating electromagnetic valves 13, the outlet sides of the first servo valve 11 and the second servo valve 12 are respectively connected with an oil pipeline corresponding to the adjusting steam valve servomotor 2, the first servo valve 11 and the second servo valve 12 are in signal connection with an MEH control system, the first servo valve 11 and the second servo valve 12 are both provided with corresponding redundant servo card modules 3, the two servo card modules 3 are respectively connected with two LVDT stroke feedback paths, redundant servo cards of the servo card modules 3 are connected by using a special redundant line and are respectively connected with the first servo valve 11 and the second servo valve 12, the two paths are mutually standby, the servo cards are freely switched to achieve the redundant configuration of the servo valves and the LVDT stroke feedback, logic configuration is carried out in an MEH system controller to realize the functions of logic judgment of control faults of the servo cards and periodic switching of control loops, the servo card model is K-SV01 and has the characteristic of a redundant working mode, the two paths are mutually hot standby working, the switching time of the servo card modules 3 is less than or equal to 10ms, oil inlet channels of the first servo valve 11 and the second servo valve 12 are both provided with an oil filter with filter element filtering holes smaller than 5 mu m, the first servo valve 11 and the second servo valve 12 are both direct-drive electro-hydraulic servo valves with the model number "D633".
Specifically, in the redundant control system for the regulating steam valve of the water supply pump steam turbine, one servo card corresponds to one servo valve, the redundant servo cards are connected by a special redundant cable in a redundant working mode, the two cards work in a mutually hot standby mode, and the switching time of the servo cards is less than or equal to 10 ms. The original regulating gasoline valve oil-operated machine 2 is provided with two LVDTs, and the two LVDTs are connected with the same servo card in stroke feedback, so that the main and standby redundancy of the LVDTs is realized. After the servo card redundancy configuration, in order to realize the LVDT redundancy of each servo card, two LVDT are required to be added, so that each servo card is connected with two LVDT signals. In the redundant control system, each servo valve is provided with an isolation electromagnetic valve 13, when the control system judges that the servo control loop fails, the system automatically sends a closing instruction of the isolation electromagnetic valve 13, meanwhile, the servo card performs main-standby switching, and the system is switched to another set of servo valves for control.
The regulating gasoline valve servomotor 2 adopts independent double-channel hydraulic control, and the two hydraulic control channels are mutually independent and do not interfere with each other. Each channel is provided with an electro-hydraulic servo valve, an isolation electromagnetic valve 13 and a manual stop valve 14, and a high-pressure precise filter element (5 mu m) is arranged on an oil inlet passage of the servo valve. The electro-hydraulic servo valve of each channel is provided with an isolation electromagnetic valve 13, when the servo valve or a servo card has a fault, the control oil way can be quickly cut off through the action of the isolation electromagnetic valve 13 without influencing the other normal oil way, and when the fault oil way is cut off, the current opening of the adjusting valve is not disturbed, and the control function of the adjusting valve is not influenced. And each hydraulic control channel is provided with four manual stop valves 14, and when a single servo valve or an isolation electromagnetic valve 13 has a fault, an oil way can be isolated for inspection and replacement, and the control function of the steam regulating valve is not influenced.
When the deviation between the opening instruction of the steam valve of the steam turbine of the feed water pump and the stroke feedback is larger than 5 percent or other faults are switched, the instantaneous disturbance of about 5 percent of the valve is allowed to exist, and the opening of the regulating valve controlled in a closed loop mode can be quickly recovered to be normal.
Wherein the utility model discloses carry out the on-line test under unit 150MW load after the complete redundancy configuration design of the little machine of the power plant of Hua Liuzhou is implemented. The method comprises the following steps of interruption of DP communication of the servo card, failure of an instruction output channel of the servo card, failure of feedback of a double-channel LVDT (linear variable differential transformer), manual and regular switching test of an operator, no disturbance of the feedback deviation of a valve at 0.4 percent, and no disturbance of the rotating speed and the water supply flow of a small engine.
When field equipment faults such as large servo valve output instruction and servo valve core feedback deviation (servo valve fault, field plugging and unplugging of a main servo valve joint), large given feedback deviation 5% (disconnection of a servo card instruction line) and the like exist in a switching test, instantaneous disturbance of which the maximum valve feedback disturbance is 4.8% can be rapidly recovered to be normal along with adjustment of closed-loop control, the rotating speed deviation of a small water supply pump is 10 revolutions per minute, the maximum water supply flow deviation is 4.8 tons per hour, and the unit operates normally. The double servo valves operate simultaneously, the normal operation of the turbonator unit is not influenced in the adjusting process, and the adjusting precision is less than or equal to 1 percent; in any functional action process of the double servo valves, the EH main oil pump of the fire-resistant oil station operates normally without influence.
In addition, after the redundant control system is adopted, the reliability of the operation of the single-row auxiliary machine is increased, the economic loss caused by the non-stop of the unit is reduced, the maintenance workload is reduced, spare parts and materials for replacing the servo valve are saved, the effect is obvious, and the redundant control system is suitable for the adjustment and the transformation of the single-row auxiliary machine, in particular for the adjustment of the hydraulic servomotor in the severe hydraulic control environment, such as the adjustment of a rotary partition door of a heat supply unit and the adjustment of a hydraulic servo control valve of a heat supply pipeline.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The utility model provides a redundant control system of feed pump steam turbine governing steam valve, includes hydraulic module (1) and regulation steam valve servomotor (2), its characterized in that: the hydraulic module (1) is integrated with a two-way direct drive type servo valve consisting of a first servo valve (11) and a second servo valve (12), oil return pipelines of the first servo valve (11) and the second servo valve (12) are both provided with electromagnetic valves (13) with functions of automatically cutting off two oil ways, two manual stop valves (14) are respectively arranged on oil return pipelines of the first servo valve (11) and the second servo valve (12), the high-pressure oil inlet end and the pressure oil return end on the inlet sides of the first servo valve (11) and the second servo valve (12) are respectively connected in parallel and then are connected into corresponding pipelines of a high-pressure fuel-resistant station, the outlet sides of the first servo valve (11) and the second servo valve (12) are communicated with the oil inlet ends corresponding to the isolation solenoid valves (13), and then are respectively connected with oil pipelines for adjusting corresponding oil ports of the gasoline valve oil motor (2), the first servo valve (11) and the second servo valve (12) are in signal connection with the MEH control system.
2. The system of claim 1, wherein the system further comprises: the first servo valve (11) and the second servo valve (12) are both provided with corresponding redundant servo card modules (3).
3. The system of claim 2, wherein the system further comprises: the two servo card modules (3) are respectively connected with two LVDT stroke feedbacks, and the redundant servo cards of the servo card modules (3) are connected by a special redundant line and are respectively connected with the first servo valve (11) and the second servo valve (12), and the two servo cards are mutually standby.
4. A feedwater pump turbine modulating steam valve redundancy control system as claimed in claim 3 wherein: the type of the servo card is K-SV01, and the switching time of the servo card module is less than or equal to 10 ms.
5. The system of claim 1, wherein the system further comprises: oil filters with filter element filtering holes smaller than 5 mu m are arranged on the oil inlet passages of the first servo valve (11) and the second servo valve (12).
6. The system of claim 1, wherein the system further comprises: the first servo valve (11) and the second servo valve (12) are both direct-drive electro-hydraulic servo valves with the model number of D633.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121035573.XU CN215057605U (en) | 2021-05-14 | 2021-05-14 | Redundancy control system for regulating steam valve of steam turbine of water supply pump |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121035573.XU CN215057605U (en) | 2021-05-14 | 2021-05-14 | Redundancy control system for regulating steam valve of steam turbine of water supply pump |
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| CN215057605U true CN215057605U (en) | 2021-12-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113236378A (en) * | 2021-05-14 | 2021-08-10 | 神华国华广投（柳州）发电有限责任公司 | Redundancy control system for regulating steam valve of steam turbine of water supply pump |
| CN114151144A (en) * | 2022-01-04 | 2022-03-08 | 中国船舶重工集团公司第七0四研究所 | Speed regulation control system based on marine double-power output unit |
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2021
- 2021-05-14 CN CN202121035573.XU patent/CN215057605U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113236378A (en) * | 2021-05-14 | 2021-08-10 | 神华国华广投（柳州）发电有限责任公司 | Redundancy control system for regulating steam valve of steam turbine of water supply pump |
| CN114151144A (en) * | 2022-01-04 | 2022-03-08 | 中国船舶重工集团公司第七0四研究所 | Speed regulation control system based on marine double-power output unit |
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