CN213574253U - Online replacement and setting steam turbine high-pressure speed regulation valve feedback device - Google Patents
Online replacement and setting steam turbine high-pressure speed regulation valve feedback device Download PDFInfo
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- CN213574253U CN213574253U CN202021526553.8U CN202021526553U CN213574253U CN 213574253 U CN213574253 U CN 213574253U CN 202021526553 U CN202021526553 U CN 202021526553U CN 213574253 U CN213574253 U CN 213574253U
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- 238000000605 extraction Methods 0.000 claims description 4
- 230000010354 integration Effects 0.000 claims description 4
- 230000002457 bidirectional effect Effects 0.000 claims description 3
- 240000004282 Grewia occidentalis Species 0.000 claims description 2
- 238000002485 combustion reaction Methods 0.000 claims description 2
- 238000010298 pulverizing process Methods 0.000 claims description 2
- 238000003303 reheating Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 6
- 239000000843 powder Substances 0.000 abstract description 3
- 238000010304 firing Methods 0.000 abstract description 2
- 238000012546 transfer Methods 0.000 abstract description 2
- 238000004891 communication Methods 0.000 abstract 1
- 239000007788 liquid Substances 0.000 abstract 1
- 230000001105 regulatory effect Effects 0.000 description 14
- 241000196324 Embryophyta Species 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The utility model discloses a steam turbine high pressure speed governing valve feedback device of setting is changed on line, including natural circulation boiler, reheat in the middle of once, four corners tangential firing, malleation direct-fired formula powder process system, a serial communication port, the steam turbine is equipped with high pressure speed governing valve, and high pressure speed governing valve is four, the steam turbine is equipped with middling pressure speed governing valve, and middling pressure speed governing valve is two, high pressure speed governing valve, middling pressure speed governing valve all adopt electric liquid servo valve control. The utility model discloses in, the relevant position of merit amplifier board and servo board is received to the output signal of feedback board in addition configuration wire, when the power wiring, pull down the power of former feedback board respectively earlier, every tears a apart, insert the wire on the independent terminal row, then through the terminal row with the power on delivering to new feedback board again, the risk that wiring short circuit power lost has been avoided, through isolated high transfer oily motive power EH oil inlet valve, the power of the disconnected servomotor, guarantee that the servomotor is in the complete shut state.
Description
Technical Field
The utility model relates to a steam turbine equipment technical field especially relates to change the steam turbine high pressure speed governing valve feedback device who sets on line.
Background
A steam turbine is also called as a steam turbine engine and is a rotary steam power device.A high-temperature and high-pressure steam passes through a fixed nozzle to become an accelerated airflow and then is sprayed onto blades, so that a rotor provided with a blade row rotates and does work outwards, an operator monitors that a CRT picture No. 4 high regulating valve opening is 48 percent and is in a full-closed position on the spot, a regulating valve control instruction is forced to be 0 by a thermal operator, but the actual power of a unit fluctuates abnormally, the pressure and the temperature of a regulating stage rock along with the pressure and the temperature of the regulating stage, AGC is released, the situation that the 4 high regulating valve is frequently opened and closed after being forced to be detected on the spot and cannot be controlled is adopted, an EH oil isolation mode is adopted, the regulating valve is controlled in the full-closed position.
When the existing steam turbine high-pressure speed regulation valve feedback device which is replaced and set on line is used, the speed regulation valve cannot be ensured to be closed completely, the problem of short circuit of a wire can occur in the replacement process, and the valve position is not easy to set after the LVDT is replaced.
SUMMERY OF THE UTILITY MODEL
The utility model aims at solving current online steam turbine high pressure speed governing valve feedback device who sets of changing, can not ensure that the speed governing valve is in the complete shut, change the problem that the short circuit can appear in the in-process electric wire, and change the shortcoming that the valve position is difficult for setting behind the LVDT, and the steam turbine high pressure speed governing valve feedback device who sets of online change that proposes.
In order to achieve the above purpose, the utility model adopts the following technical scheme: on-line replacement and setting steam turbine high-pressure speed regulation steam valve feedback device comprises a natural circulation boiler, a single intermediate reheating, four-corner tangential combustion and positive pressure direct-fired pulverizing system, and is characterized in that the steam turbine is provided with a high-pressure speed regulation steam valve, the high-pressure speed regulation steam valve is four, the steam turbine is provided with a medium-pressure speed regulation steam valve, the medium-pressure speed regulation steam valve is two, the high-pressure speed regulation steam valve and the medium-pressure speed regulation steam valve are controlled by an electro-hydraulic servo valve, a unit adopts a DCS control system, and DEH is integrated in the DCS system.
As a further description of the above technical solution:
the DEH integration comprises a servo plate, a power amplifier plate, an electro-hydraulic servo valve, an LVDT feedback plate, an oil-driven machine and an LVDT.
As a further description of the above technical solution:
the servo board is electrically connected with the power amplifier board in a one-way mode, and the power amplifier board is electrically connected with the electro-hydraulic servo valve in a one-way mode.
As a further description of the above technical solution:
the electro-hydraulic servo valve is electrically connected with the servomotor in a bidirectional mode, and the servomotor is electrically connected with the LVDT feedback plate in a unidirectional mode.
As a further description of the above technical solution:
the LVDT feedback plate is electrically connected with the power amplifier plate in a unidirectional mode, and the LVDT feedback plate is electrically connected with the servo plate in a unidirectional mode.
As a further description of the above technical solution:
the steam turbine is a double-cylinder double-exhaust steam and extraction steam heat supply unit.
To sum up, owing to adopted above-mentioned technical scheme, the beneficial effects of the utility model are that: the utility model discloses in, the relevant position of merit amplifier board and servo board is received to the output signal of feedback board in addition configuration wire, when the power wiring, pull down the power of former feedback board respectively earlier, every tears a apart, insert the wire on the independent terminal row, then through the terminal row with the power on delivering to new feedback board again, the risk that wiring short circuit power lost has been avoided, through isolated high transfer oily motive power EH oil inlet valve, the power of the disconnected servomotor, guarantee that the servomotor is in the complete shut state.
Drawings
Fig. 1 is the control schematic diagram of the high-pressure speed-regulating valve of the utility model.
Wherein: 1. a servo board; 2. a power amplifier board; 3. an electro-hydraulic servo valve;
4. an oil-operated machine; 5. an LVDT feedback plate;
6、LVDT。
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 of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1, change the steam turbine high pressure speed governing valve feedback device of setting on line, including natural circulation boiler, once middle reheat, four corners tangential firing, malleation direct-fired formula powder process system, its characterized in that, the steam turbine is equipped with high pressure speed governing valve, and high pressure speed governing valve is four, the steam turbine is equipped with medium pressure speed governing valve, and medium pressure speed governing valve is two, high pressure speed governing valve, medium pressure speed governing valve all adopt electro-hydraulic servo valve 3 control, and the unit adopts DCS control system, and the DEH integration is in the DCS system, integrated design.
Example (b): a power plant 2 x 300MW unit is a subcritical natural circulation boiler of SG-1025-17.6 type produced by a Shanghai boiler plant, is reheated once, is tangentially fired at four corners, and is a positive pressure direct blowing powder making system, a steam turbine is an NC300/220-16.7-535/535 type double-cylinder double-steam-exhaust produced by an Orient steam turbine plant, the steam extraction heat supply unit is provided with 4 high-pressure speed regulation steam valves and 2 medium-pressure speed regulation steam valves which are all controlled by an electro-hydraulic servo valve 3, the unit is controlled by a 5000M type DCS control system of Beijing Hitachi company, and DEH is integrated in the DCS system.
The fault phenomenon is as follows: the operator monitoring panel finds that the opening of the CRT picture No. 4 high-speed adjusting valve is 48%, the CRT picture No. 4 high-speed adjusting valve is in a full-closing position on the spot, a thermotechnical worker forces a regulating valve control instruction to be 0, but the actual power of a unit abnormally fluctuates, the pressure and the temperature of a regulating stage rock along with the fluctuation, AGC is removed, the operator checks on the spot to find that the No. 4 high-speed adjusting valve is frequently opened and closed after being forcibly closed and cannot be controlled, the regulating valve is controlled in the full-closing position in an EH oil isolation mode, and the regulating valve is.
Reason analysis: according to the control principle of the high-pressure speed-regulating valve, after the opening command of the high-pressure speed-regulating valve of the DEH system is forced to be 0, the high-pressure speed-regulating valve still frequently opens and closes, and the fault of the LVDT 6 or the LVDT 6 front-mounted plate is analyzed to cause the sudden change of the feedback of the valve regulation and cause the misoperation of the valve regulation. After the valve is replaced and reset, the speed regulating valve can be normally put into operation.
The method comprises the following steps: the power of the servomotor 4 is cut off by isolating an EH oil inlet valve of the high-speed-regulating servomotor, the servomotor 4 is ensured to be in a fully closed state, the replaced LVDT feedback plate 5 is not replaced in situ any more, but is placed in a relatively wide area, an output signal of the feedback plate 5 is additionally provided with a lead to be connected to corresponding positions of the power amplifier plate 2 and the servo plate 1, when a power supply is connected, the power supply of the original LVDT feedback plate 5 is detached respectively, each wire is connected to an independent terminal row, then the power supply is sent to the new LVDT feedback plate 5 through the terminal row, the risk of losing a wiring short-circuit power supply is avoided, aiming at the principle of feedback setting of a high-pressure speed-regulating throttle valve, the valve positioning is determined by analyzing the connection mode of the servomotor 4 and a feedback device, and the online setting is carried out: after the new LVDT 6 is replaced, the yellow and brown resistances of a primary coil of the LVDT 6 are measured to be 174 ohms, the resistances of a secondary coil are measured to be 1 red and blue 285 ohms, the resistances of a secondary coil 2 are measured to be light green and black 285 ohms, all parameters are normal, the wiring is checked to be correct, the current feedback signal is normal, the current feedback signal is communicated with the engineering in advance, after the accurate travel distance of the speed regulating valve servomotor 4 is obtained, a connecting piece between the LVDT 6 and the servomotor 4 is disconnected, the LVDT 6 is moved up and down according to the high regulating valve travel, and two potentiometers of a zero point and a measuring range on a front position device are regulated to carry out analog setting.
Furthermore, the DEH integration comprises a servo plate 1, a power amplifier plate 2, an electro-hydraulic servo valve 3, an LVDT feedback plate 5, an oil motor 4 and an LVDT 6.
Further, the servo board 1 is electrically connected to the power amplifier board 2 in a single direction, and the power amplifier board 2 is electrically connected to the electro-hydraulic servo valve 3 in a single direction.
Further, the electro-hydraulic servo valve 3 is electrically connected with the servomotor 4 in a bidirectional manner, and the servomotor 4 is electrically connected with the LVDT feedback plate 5 in a unidirectional manner.
Furthermore, the LVDT feedback plate 5 is electrically connected with the power amplifier plate 2 in a unidirectional manner, and the LVDT feedback plate 5 is electrically connected with the servo plate 1 in a unidirectional manner.
Furthermore, the steam turbine is a double-cylinder double-exhaust steam and steam extraction heat supply unit.
The utility model discloses the theory of operation:
firstly, the stroke of the servomotor 4 is measured by the LVDT 6 and sent to the LVDT feedback plate 5, the voltage signal is converted into a 1-5V voltage signal, one path of the voltage signal is sent to a DEH system through the servo plate 1 for display and logic operation, the other path of the voltage signal is sent to the power amplifier plate 2 through a hard wire, the power amplifier plate 2 simultaneously receives an opening command of the servo plate 1 and compares the opening command with a feedback signal for operation, an instruction is output to the electrohydraulic servo valve 3 to control the servomotor 4 to operate, when the opening command is equal to the feedback signal, the servomotor 4 stops operating, the high-speed governor is fixed at a new position to finish valve control, after the new LVDT 6 is replaced, the resistance of a primary coil of the LVDT 6 is measured to 174 ohms, the resistance of a secondary coil is 1285 ohms, the resistance of the secondary coil 2 is 285 ohms, all parameters are normal, the wiring is checked to be correct, the current feedback signal is normal and is communicated with, after the accurate stroke distance of the servomotor 4 is obtained, the connecting piece between the LVDT 6 and the servomotor 4 is unfastened, the LVDT 6 is moved up and down according to the stroke of the high-regulating valve, the zero point and the range two potentiometers on the front-end device are adjusted to simulate and set the zero point and the range two potentiometers, after the valve position setting is finished, the measured stroke data is correct, the feedback device is reliably connected with the servomotor 4 again, the EH oil valve of the servomotor 4 is slowly opened, the state of the servomotor 4 is normal, a forced method is adopted, the valve opening degree of the valve is gradually increased, the servomotor 4 acts normally, the valve position and the actual opening degree are accurate, after the test is finished, the speed-regulating valve is put into automatic control, and the replacement and setting work is finished, so the working principle of the utility.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (6)
1. On-line replacement and setting steam turbine high-pressure speed regulation steam valve feedback device comprises a natural circulation boiler, a single intermediate reheating, four-corner tangential combustion and positive pressure direct-fired pulverizing system, and is characterized in that the steam turbine is provided with a high-pressure speed regulation steam valve, the high-pressure speed regulation steam valve is four, the steam turbine is provided with a medium-pressure speed regulation steam valve, the medium-pressure speed regulation steam valve is two, the high-pressure speed regulation steam valve and the medium-pressure speed regulation steam valve are controlled by an electro-hydraulic servo valve, a unit adopts a DCS control system, and DEH is integrated in the DCS system.
2. The steam turbine high-pressure speed regulation valve feedback device for on-line replacement and setting according to claim 1, wherein the DEH integration comprises a servo plate, a power amplifier plate, an electrohydraulic servo valve, an LVDT feedback plate, a servomotor and an LVDT.
3. The steam turbine high-pressure speed regulation valve feedback device for on-line replacement and setting according to claim 2, wherein the servo board is electrically connected with the power amplifier board in a one-way manner, and the power amplifier board is electrically connected with the electrohydraulic servo valve in a one-way manner.
4. The steam turbine high-pressure speed regulation valve feedback device for on-line replacement and setting according to claim 2, wherein the electrohydraulic servo valve is electrically connected with the servomotor in a bidirectional way, and the servomotor is electrically connected with the LVDT feedback plate in a unidirectional way.
5. The steam turbine high-pressure speed regulation valve feedback device for on-line replacement and setting according to claim 2, wherein the LVDT feedback plate is in one-way electrical connection with the power amplifier plate, and the LVDT feedback plate is in one-way electrical connection with the servo plate.
6. The steam turbine high-pressure speed regulation valve feedback device for on-line replacement and setting according to claim 2, wherein the steam turbine is a double-cylinder double-exhaust steam extraction heat supply unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021526553.8U CN213574253U (en) | 2020-07-29 | 2020-07-29 | Online replacement and setting steam turbine high-pressure speed regulation valve feedback device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021526553.8U CN213574253U (en) | 2020-07-29 | 2020-07-29 | Online replacement and setting steam turbine high-pressure speed regulation valve feedback device |
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| CN213574253U true CN213574253U (en) | 2021-06-29 |
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| CN202021526553.8U Expired - Fee Related CN213574253U (en) | 2020-07-29 | 2020-07-29 | Online replacement and setting steam turbine high-pressure speed regulation valve feedback device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114049030A (en) * | 2021-11-22 | 2022-02-15 | 中广核工程有限公司 | Nuclear power station steam turbine control valve performance diagnosis method, storage medium and computer |
| CN115938185A (en) * | 2023-02-03 | 2023-04-07 | 华能济南黄台发电有限公司 | State overhaul training device for EH control system of power plant |
-
2020
- 2020-07-29 CN CN202021526553.8U patent/CN213574253U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114049030A (en) * | 2021-11-22 | 2022-02-15 | 中广核工程有限公司 | Nuclear power station steam turbine control valve performance diagnosis method, storage medium and computer |
| CN115938185A (en) * | 2023-02-03 | 2023-04-07 | 华能济南黄台发电有限公司 | State overhaul training device for EH control system of power plant |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210629 |