CN211314292U - Main steam valve electro-hydraulic control system of steam turbine - Google Patents
Main steam valve electro-hydraulic control system of steam turbine Download PDFInfo
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- CN211314292U CN211314292U CN201922347270.0U CN201922347270U CN211314292U CN 211314292 U CN211314292 U CN 211314292U CN 201922347270 U CN201922347270 U CN 201922347270U CN 211314292 U CN211314292 U CN 211314292U
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Abstract
The utility model discloses a steam turbine main steam valve electro-hydraulic control system, including main steam valve automatic start and stop ware unit, automatic start and stop ware's controller unit, manual interruption and resetting means unit, emergency interruption throttle unit, its characterized in that, the controller unit of automatic start and stop ware is a valves, and the valves include the valve body and arrange first solenoid valve, second solenoid valve, the liquid accuse slide valve on the valve body, still be equipped with orifice, pressure measurement interface and a plurality of oil circuit interface that are used for with other unit connections on the valve body; the valve body is provided with six mounting surfaces, and the first electromagnetic valve and the second electromagnetic valve are arranged on the top surface mounting surface; the hydraulic control slide valve is arranged on the front mounting surface; the throttle hole is arranged on the bottom surface mounting surface; the pressure measuring interface is arranged on the left mounting surface; other oil circuit interfaces are respectively arranged on the front mounting surface, the right side mounting surface and the bottom surface mounting surface; the back is a plane as the mounting surface for fixing the valve group and the bracket.
Description
Technical Field
The utility model belongs to the technical field of hydraulic control, a steam turbine main steam valve electricity liquid control system is related to.
Background
At present, in the waste heat or biomass fuel steam turbine generator units operated in China, the steam turbine generator unit controlled by low-pressure turbine oil has a large proportion, each main engine plant mostly has a self-regulating security system, and the opening and closing control of a main steam valve of the steam turbine generator mostly adopts an electro-hydraulic control system, as shown in figure 1, the system comprises a main steam valve automatic opening and closing device unit, a controller unit of an automatic opening and closing device, a manual interruption and reset device unit and a critical interruption accelerator unit, wherein the controller unit of the automatic opening and closing device adopts a starting valve and a synchronizer as control elements, an integrated block has a single function and needs to be installed at a specific position, all functional devices are dispersed, oil circuit control of each link cannot be efficiently coordinated, the system stability is reduced, the universality is avoided, and the steam turbine generator unit regulated by pure hydraulic pressure or a synchronizer with long part of operation time needs to be modified, when in reconstruction, the corresponding regulating security system needs to be reconstructed. It is necessary to find a control device which has good control stability, high safety and is easy to install and integrate into a regulation security system to realize the control of the security system.
SUMMERY OF THE UTILITY MODEL
The utility model provides a steam turbine main steam valve electricity liquid control system can compensate above-mentioned prior art not enough, and its technical solution is:
the utility model provides a steam turbine main steam valve electricity liquid control system, includes main steam valve automatic start and stop ware unit, automatic start and stop's controller unit, manual interruption and resetting means unit, emergency interruption throttle unit, its characterized in that, the controller unit of automatic start and stop ware is a valves, and this valves includes the valve body and arranges first solenoid valve, second solenoid valve, the liquid accuse slide valve on the valve body, still is equipped with orifice, pressure measurement interface and a plurality of oil circuit interface on the valve body.
The valve body is provided with six mounting surfaces, and the first electromagnetic valve and the second electromagnetic valve are arranged on the top surface mounting surface; the hydraulic control slide valve is arranged on the front mounting surface; the throttle hole is arranged on the bottom surface mounting surface; the pressure measuring interface is arranged on the left mounting surface; the oil circuit interfaces are respectively arranged on the front mounting surface, the right side mounting surface and the bottom surface mounting surface; the back is a plane as the mounting surface for fixing the valve group and the bracket.
The oil way interface on the valve body comprises a reset oil interface, a safety oil interface, a control oil interface, a pressure oil interface and an oil return interface; the reset oil interface, the safety oil interface and the control oil interface are arranged on the front mounting surface, the pressure oil interface is arranged on the right mounting surface, and the oil return interface is arranged on the bottom mounting surface.
The utility model has the advantages that:
the utility model discloses strong adaptability, comprehensive, the safe and reliable's of function hydraulic control device principle has been designed according to main steam valve automatic start/stop ware hydraulic actuator's characteristics. The controller unit structurally considers measures such as centralized interfaces, unified equipment installation surfaces, fixed throttling holes for limiting flow loss and the like, and therefore universality, environmental adaptability, efficiency and the like of use places are greatly improved. The controller has higher universality and strong environmental adaptability, the whole device has compact structure, is convenient to be externally arranged in the main steam valves of various turbines and the hydraulic actuating mechanisms of security systems, is convenient for the integration and embedding of the systems, and the convenience of overhauling and replacing the controller is more favorable for the online maintenance of the systems; the hydraulic actuator of the main steam valve can be stably controlled, oil can be quickly drained in case of emergency or oil source disappearance, and the hydraulic actuator of the main steam valve can be quickly controlled to be restored to a closed state or an initial position.
The utility model has the characteristics of centralized equipment and control function, stable and reliable control, high safety, few external interfaces, convenient troubleshooting, certain universality and strong environmental adaptability; meanwhile, the problem that remote control cannot be realized through control of a main steam valve and control of a reset hanging brake of a pure liquid regulation and transformation unit is solved.
Drawings
FIG. 1 is a block diagram of a prior art steam turbine main steam valve electro-hydraulic control system
FIG. 2 is a structural diagram of the main steam valve electrohydraulic control system of the steam turbine
Fig. 3 is a structural view of a controller unit of the automatic opening and closing device of fig. 2
FIG. 4 is a perspective view of the controller of the automatic opening and closing device
FIG. 5 is a second schematic perspective view of the controller of the automatic opening/closing device
FIG. 6 is a third schematic perspective view of the controller of the automatic opening and closing device
FIG. 7 is a fourth schematic drawing showing the controller of the automatic opening/closing device
The reference numbers in the figures mean:
a-an automatic opening and closing device unit; b-a controller unit of the automatic start-stop device;
c-a manual interrupt and reset device unit; d-emergency trip throttle unit;
1-a valve body; 2-a first solenoid valve; 3-a second solenoid valve; 4-a pilot operated slide valve; 5-orifice;
6-resetting the oil interface; 7-safety oil interface; 8-control the oil interface; 9-pressure oil interface; 10-oil return interface;
11-pressure measuring interface; 101-back of controller B; 201-flushing plate of first solenoid valve;
202-flushing plate of second solenoid valve.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in fig. 2, the main steam valve electro-hydraulic control system of the steam turbine comprises a main steam valve automatic open/close device unit A, an automatic open/close controller unit B, a manual obstruction and reset device unit C and a critical obstruction accelerator unit D,
the utility model discloses a characteristics are improved the controller unit B of automatic start and stop ware, refer to fig. 3 to fig. 7, the controller unit B of automatic start and stop ware is a valves, and this valves includes valve body 1 and arranges first solenoid valve 2, second solenoid valve 3, the liquid accuse sliding valve 4 on valve body 1, still is equipped with orifice 5 on the valve body 1, the oil that resets connects 6, safe oil interface 7, control oil interface 8, pressure oil interface 9, oil return interface 10, pressure measurement interface 11.
The valve body 1 is provided with six mounting surfaces, and the first electromagnetic valve 2 and the second electromagnetic valve 3 are arranged on the top mounting surface; the hydraulic control slide valve 4 is arranged on the front mounting surface; the orifice 5 is arranged on the bottom surface mounting surface; the pressure measuring interface 11 is arranged on the left mounting surface; the reset oil interface 6, the safety oil interface 7 and the control oil interface 8 are arranged on the front mounting surface, the pressure oil interface 9 is arranged on the right mounting surface, and the oil return interface 10 is arranged on the bottom mounting surface; the back is a plane as the mounting surface for fixing the valve group and the bracket.
As shown in fig. 3, the first solenoid valve 2 mainly functions to generate safety oil and rapidly discharge the safety oil in an emergency; the second electromagnetic valve 3 is used for generating reset oil for the emergency trip slide valve, and the safety oil generated by the first electromagnetic valve 2 can maintain pressure only after the emergency trip slide valve is reset by the reset oil, and is used at other positions of the system where the safety oil is needed.
The hydraulic control slide valve 4 is an embedded slide valve, pressure oil entering a main valve is controlled by the first electromagnetic valve 2, and when the force formed by the pressure of the safety oil is larger than the pre-opening force of the hydraulic control slide valve, the hydraulic control slide valve moves forwards to connect a passage of the pressure oil and the control oil of the main valve, so that the pressure oil enters the lower part of the automatic main valve closer to form an oil path for opening the automatic main valve closer. When the safety oil disappears in the system or the first electromagnetic valve 2 acts to communicate the safety oil with the oil return passage, the pressure of the safety oil drops rapidly, the hydraulic control slide valve 4 moves backwards rapidly under the action of pre-opening force to connect the passage of the main valve control oil and the oil return, the oil on the lower part of the main valve automatic closer returns from the oil return port rapidly, the pressure drops rapidly, and the main valve automatic closer recovers to a closed state rapidly.
The throttling hole 5 is a throttling hole embedded in the valve body and mainly used for achieving a throttling effect from a pressure oil inlet of the first electromagnetic valve 2, limiting the flow of the safety oil way, preventing the pressure reduction speed of the safety oil way from being too low in emergency action, and preventing the pressure oil from being pulled too low to enable the system to work normally. The throttling hole 5 can be used as a key point for adjusting the stability and the rapidity of the safety oil of the system, leakage points with different degrees exist in part of oil system structures, the leakage amount can be properly enlarged according to the size of the leakage amount of the actual system, and the rapidity of the reduction of the safety oil way during pressure relief must be guaranteed.
The controller B of the main steam valve automatic start-stop device has no other easily-contacted equipment except for the control oil output interface and the oil supply pressure measuring interface, and has a certain effect on the protection of the equipment. The back mounting surface 101 of the main steam valve automatic closer controller unit with the resetting and brake hanging functions is a plane without any shielding, and the connection pipe direction of the oil way interface has no tendency of interfering with the mounting surface, so that the mounting of the integrated device is not limited by the space of the mounting surface. The main steam valve automatic closing controller unit with the resetting and brake hanging functions can be replaced as long as the installation surface is ensured to be a flat surface and enough operation space is reserved on other installation surfaces. During installation, only the space for operating the manual test port is required to be considered so as to ensure that the two sides of the electromagnetic valve are left, and whether the hydraulic circuit acts normally or not can be tested under the condition of no electric signal when the function test is carried out. During the normal work of the system, the manual test port is forbidden to be operated, and the automatic main steam valve closer is prevented from being closed accidentally.
The controller B is also provided with an oil path cleaning accessory (a flushing plate), and the oil port of each valve is correspondingly provided with a flushing plate which comprises an electromagnetic valve flushing plate 201 and an electromagnetic valve flushing plate 202. The flushing plate is used for communicating oil passages of all valve ports, so that high-pressure oil entering the device from the oil supply port forms strong turbulence at the bend when passing through the flushing plate, and an effective flushing effect is formed on the oil passage. The oil circuit washing plate plays a role in connecting an oil circuit and sealing oil ports of each valve body when the electro-hydraulic servo integrated device is washed, and a closed circulating oil circuit is formed. The valve body of the main steam valve automatic closing controller unit with the reset hanging brake function provides clean internal working environment creating conditions, and the conditions are prerequisites for ensuring the control stability and safety of the whole main steam valve automatic closing controller unit with the reset hanging brake function.
The principle of the controller B is shown in fig. 3: the oil supply is performed by supplying the pressure oil to the orifice 5, the second solenoid valve 3 having the return function, and the pilot operated spool 4 through the oil passage of the pressure oil port 9. The orifice 5 converts the supplied pressure oil into safe oil path control oil, the formed safe oil path control oil enters a safe oil loop under the control of the first electromagnetic valve 2, one path is sent to other equipment through a safe oil interface 7, the other path pushes the hydraulic control slide valve 4 forwards, and after the hydraulic control slide valve 4 is in position, the pressure oil and the main throttle automatic closer control oil channel are communicated with a main throttle control oil interface 8, so that the main throttle automatic closer can be ensured to be opened smoothly. In addition, one path of oil supply passes through an oil inlet of a reset solenoid valve, when the emergency shut-off slide valve needs to be reset, a reset solenoid valve controls a path for connecting pressure oil and reset oil to reset an oil interface 6, after the reset is completed, the solenoid valve returns to the original position, the paths of the oil supply and other loops are blocked, and the reset oil is communicated to an oil return path oil return interface 10, so that a brake hanging state is formed, the emergency shut-off slide valve can be triggered by an emergency breaker under the emergency condition, the safety oil is discharged, and the safety of the system is guaranteed. When an emergency occurs, such as the electromagnetic valve receives a closing instruction, the oil pressure of oil supply disappears and the like, the electromagnetic valve cuts off a loop of control oil of a safety oil path generated by the throttling regulating valve, and introduces the generated safety control oil into return oil, so that the hydraulic control slide valve forms a state of rapidly introducing the control oil of the main throttle automatic closer into the return oil, and the main throttle automatic closer rapidly restores the main throttle to an initial position under the action of a spring. When the oil supply pressure disappears, the hydraulic control slide valve 4 forms a position for quickly introducing the control oil of the main valve automatic closer into the return oil under the action of the spring, and the main valve automatic closer quickly restores the main valve to the initial position under the action of the spring. When the demand exists, the electromagnetic control valve with the corresponding function is replaced to realize the intellectualization and the digitization of the control, and the electromagnetic control valve with the field bus function can be adopted to achieve the field bus control of each valve. The intelligent network level of the controlled equipment is improved, the information sharing of the whole control is realized, and the modernization of the decentralized field bus control is realized.
The working principle of the safety part of the steam turbine regulating safety system is described in fig. 1, the original system of the regulating safety system is a safety system with a manual starting valve, a manual interruption and a reset valve, and the system needs to be operated for many times in the process of establishing a safety oil path so as to realize the interlocking relationship of a hydraulic system, thereby establishing the safety oil path and the emergency interruption condition. From the description of the principle part of fig. 3 in the preceding paragraph, it is understood that the system can be operated remotely by means of the first solenoid valve 2 and the second solenoid valve 3, and the original combination control of the starting valve group, the interruption valve group and the reset valve group can be realized only by reserving the controller unit of the automatic main steam valve closer, if the manual interruption function is required to be reserved, can keep the equipment of the cloud line part in figure 2, realizes the purposes of non-interference and independent control of the interdiction and reset valve group and the main steam valve automatic closer controller unit, the method and the device have the advantages that the reconstruction of the original steam turbine adjusting safety system with flying ring emergency shut-off slide valve and main valve automatic shutoff combined control is realized, the functions of centralized control, remote automatic control and the like of the automatic shutoff and emergency breaker slide valve are realized, the original shut-off and reset valve group oil circuit is reduced, the influence of multiple control links on the safety of the safety system is reduced, and the reliability and the stability of the safety oil circuit are enhanced.
The utility model discloses structurally considered and concentrated interface, unified equipment installation face, fixed throttle orifice restriction flow loss's measures, made this device have very big improvement to commonality, environmental suitability, efficiency etc. of using the place. The hydraulic control device principle with strong adaptability, comprehensive functions, safety and reliability is designed according to the characteristics of the hydraulic actuating mechanism of the automatic main steam valve closer.
The valve body 1 is used for realizing communication of oil ducts of valve elements, is provided with oil ports corresponding to the electromagnetic valves and valve mounting holes, and can accurately control the flow direction of hydraulic oil and quickly drain oil in an emergency state. In the device, the valve body realizes that pressure oil is introduced into a safety oil control channel and a reset brake-hanging oil control channel, oil circuit switching is realized through an electromagnetic valve, and an electric signal of a control system is converted into an oil circuit switching channel, so that firstly, the reset function and the brake-hanging preparation of an emergency shut-off accelerator or a slide valve are realized, and secondly, the safety oil establishment is realized. The hydraulic control slide valve is additionally arranged in the valve body, the designed hydraulic control slide valve is flexible in action and has pre-opening pressure setting, when the security oil pressure reaches a set value, the slide valve acts to introduce pressure oil into an opening oil channel of the automatic main steam valve closer to establish opening oil pressure of the automatic closer, when the security oil pressure is reduced to the set value, the slide valve rapidly moves under the action of a pre-opening spring, the main steam valve automatic closer is rapidly connected with the channel for opening oil and returning oil, the closing function of the automatic closer can be rapidly realized, and therefore the main steam valve is rapidly restored to a closing state or an initial position under an emergency condition. The valve body realizes the functions of resetting and hanging the brake, the opening and closing control of the main valve, the establishment of safety oil pressure and the like to be integrated into one pressure oil loop, and a proper throttling device is arranged, so that the one-stop control of all the functions can be realized, and the misoperation of all the oil ports caused by oil pressure impact can be avoided.
When the controller B works normally, all the electromagnetic valves are not electrified, all the electromagnetic valves adopt the electromagnetic valves with self-locking performance, and under the condition that the oil system controls the automatic main steam valve closer to normally enter steam, the electromagnetic valves are respectively positioned at a hanging brake control position and a main steam valve opening control position. In emergency, the controller unit receives unloading command to electrify the solenoid valve to the main valve and lock the solenoid valve in the closed position, the oil path of the solenoid valve is communicated with the oil path for maintaining oil and returning oil, the oil path is drained quickly, the pilot operated slide valve moves quickly under the action of the pre-starting spring, the automatic main valve closer opens the oil path for quickly communicating with the oil path under the action of the pilot operated slide valve, the main valve returns to the initial closed state or the safe position, and the steam inlet path of the main valve is cut off quickly to protect the controlled equipment.
The installation size of each electromagnetic valve for control of the controller B has an interface completely conforming to ISO4401 related standards, a control electromagnetic valve with a bus communication or position feedback function can be replaced according to needs, the intellectualization and the digitization of the control of the hydraulic actuating mechanism are realized, the intelligent network level of controlled equipment is improved, the information sharing of the whole control is realized, and the modernization of the decentralized field bus control is realized.
Besides the normal control function and safety, a pressure measuring device is added on a process interface of the oil supply loop, and the oil pressure state can be monitored on line. When the oil pressure state needs to be monitored and controlled on line, the pressure gauge is connected with the pressure measuring connector through the additional connecting hose, the pressure gauge and the hose are fixed and then connected with threads of the pressure measuring connector, the thimble in the hose opens the sealing cone in the pressure measuring connector, pressure oil in the device is sent to the external pressure gauge, and the online monitoring of the oil pressure state is controlled through the pressure gauge.
The oil path cleaning accessories 201 and 202 are necessary equipment for cleaning the internal pipeline of the integrated valve group. The integrated valve group shell is a carrier of a system oil circuit, an oil circuit channel in the shell is firstly cleaned by using hydraulic oil to remove impurities in the oil circuit channel, in order to clean the oil circuit channel completely, a corresponding oil circuit cleaning accessory, namely a cleaning plate, is matched at an oil port of each valve, so that the hydraulic oil in a high-pressure state can circulate in the shell, a high-speed liquid bundle is formed in an inner pipeline, the high-speed liquid bundle forms strong turbulence at a bend, and an effective cleaning effect is formed on the oil circuit channel. After the oil way is cleaned, each control valve is installed on the integrated block shell, so that the control valves work in a clean hydraulic oil environment, the stability and the reliability of control are ensured, and if a precise oil filtering device is added in an oil supply loop of the integrated device, the service life and the control precision of the hydraulic valve can be greatly improved.
Claims (3)
1. The utility model provides a steam turbine main steam valve electricity liquid control system, includes main steam valve automatic start and stop ware unit, automatic start and stop's controller unit, manual interruption and resetting means unit, emergency interruption throttle unit, its characterized in that, the controller unit of automatic start and stop ware is a valves, and this valves includes the valve body and arranges first solenoid valve, second solenoid valve, the liquid accuse slide valve on the valve body, still is equipped with orifice, pressure measurement interface and a plurality of oil circuit interface on the valve body.
2. The steam turbine main steam valve electrohydraulic control system of claim 1, wherein said valve body has six mounting faces, a first solenoid valve, a second solenoid valve being disposed on a top mounting face; the hydraulic control slide valve is arranged on the front mounting surface; the throttle hole is arranged on the bottom surface mounting surface; the pressure measuring interface is arranged on the left mounting surface; the oil circuit interfaces are respectively arranged on the front mounting surface, the right side mounting surface and the bottom surface mounting surface; the back is a plane as the mounting surface for fixing the valve group and the bracket.
3. The steam turbine main steam valve electrohydraulic control system of claim 2, wherein said oil path ports on said valve body include a reset oil port, a safety oil port, a control oil port, a pressure oil port and an oil return port; the reset oil interface, the safety oil interface and the control oil interface are arranged on the front mounting surface, the pressure oil interface is arranged on the right mounting surface, and the oil return interface is arranged on the bottom mounting surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922347270.0U CN211314292U (en) | 2019-12-24 | 2019-12-24 | Main steam valve electro-hydraulic control system of steam turbine |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922347270.0U CN211314292U (en) | 2019-12-24 | 2019-12-24 | Main steam valve electro-hydraulic control system of steam turbine |
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| CN211314292U true CN211314292U (en) | 2020-08-21 |
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| CN201922347270.0U Active CN211314292U (en) | 2019-12-24 | 2019-12-24 | Main steam valve electro-hydraulic control system of steam turbine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114658498A (en) * | 2020-12-23 | 2022-06-24 | 上海电气电站设备有限公司 | Steam turbine combined valve and design method thereof |
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2019
- 2019-12-24 CN CN201922347270.0U patent/CN211314292U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114658498A (en) * | 2020-12-23 | 2022-06-24 | 上海电气电站设备有限公司 | Steam turbine combined valve and design method thereof |
| CN114658498B (en) * | 2020-12-23 | 2024-03-19 | 上海电气电站设备有限公司 | Combined valve of steam turbine and design method thereof |
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