CN109404065A - Prevent host porthole blocking solenoid valve failure from causing the control method of unit tripping - Google Patents
Prevent host porthole blocking solenoid valve failure from causing the control method of unit tripping Download PDFInfo
- Publication number
- CN109404065A CN109404065A CN201811188733.7A CN201811188733A CN109404065A CN 109404065 A CN109404065 A CN 109404065A CN 201811188733 A CN201811188733 A CN 201811188733A CN 109404065 A CN109404065 A CN 109404065A
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- Prior art keywords
- valve
- solenoid valve
- oil
- pressure
- unit
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/20—Devices dealing with sensing elements or final actuators or transmitting means between them, e.g. power-assisted
- F01D17/22—Devices dealing with sensing elements or final actuators or transmitting means between them, e.g. power-assisted the operation or power assistance being predominantly non-mechanical
- F01D17/26—Devices dealing with sensing elements or final actuators or transmitting means between them, e.g. power-assisted the operation or power assistance being predominantly non-mechanical fluid, e.g. hydraulic
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Prevent host porthole blocking solenoid valve failure from causing the control method of unit tripping the invention discloses a kind of, if wiring loosening or when short circuit in blocking solenoid valve control circuit, triggers the fast OFF signal of pressure of corresponding pitch, EH oil is blocked to enter oil motor；When high, each quick closing valve solenoid valve of intermediate pressure main stop valve issues disconnection signal, which operates corresponding main inlet throttle-stop valve direction valve linkage function block, closes corresponding direction valve；If interdict solenoid valve internal transmission part bite, when unit operates normally, corresponding valve the first quick closing valve solenoid valve and the second quick closing valve solenoid valve electriferous state, valve command be greater than 8%, valve position feedback in off position, EH oil main-piping pressure be less than delay certain time after 150bar meets simultaneously and trigger failsafe valve, block EH oil to enter oil motor.This method can close in time the instruction of corresponding direction valve and pitch, so that the stabilization of EH oil pressure be maintained to ensure unit normal operation, improve the economy of unit operation.
Description
Technical field
The invention belongs to power plant electrical equipment technical fields, prevent host porthole from interdicting solenoid valve more particularly to one kind
Failure causes the control method of unit tripping.
Background technique
660MW extra-supercritical unit designs altogether 9 oil motors, is main inlet throttle-stop valve oil motor 2 respectively, pitch oil motor 2
Only, reheat throttle-stop valve oil motor 2, reheating pitch oil motor 2 and filling valve oil motivation 1, main vapour pitch and main inlet throttle-stop valve
Oil motor working principle is as shown in Figure 1.When unit is in tripping, quick closing valve solenoid valve 1,2 is in power failure state, quick closing valve solenoid valve
Slide bar under spring force completely cuts off pressure oil oil inlet to top is mobile, and check valve upper pressure oil by valve body and is returned
Oil pipe line connection and venting check valve upper pressure, so that check valve be opened, by pressure venting between servo valve and oil motor,
Ensure that unit porthole is closed in time.
When unit is when hanging lock state, pitch instruction is " 0 ", is in close state under electrohydraulic servo valve bias,
That is state of isolation is in Fig. 1 between P point and A point, it is ensured that when shutting down EH oil pressure can establish unit.After unit resets,
Quick closing valve solenoid valve 1,2 is in electriferous state, and the slide bar of quick closing valve solenoid valve is moved to the lower part by pressure oil under the action of electromagnetic force
It is sent through throttle orifice to check valve top by P point, check valve valve rod, which moves down, under the action of pressure oil moves servo valve and oil
Pipeline and oil return line completely cut off between machine, it is ensured that oil motor is by servo valve control.When pitch, which instructs, to be changed, output is watched to electro-hydraulic
The electric current for taking the torque-motor coil of valve generates magnetic force at armature both ends, rotates armature baffle plate assembly around spring piping support, gear
The offset of plate turns down the variable orifice of side nozzle flapper, and liquid stream shunting is made to be the spool end that the nozzle communicates, valve
Core is mobile, and changing oil motor pressure at both sides makes oil motor spool generate displacement to change main vapour pitch position, until position is anti-
Feedback is consistent with instruction；Main inlet throttle-stop valve is then opened or closed through direction valve control.
When quick closing valve solenoid valve breaks down, system EH oil pressure can be caused to drop quickly to group setup value, so as to cause
The accident of unit tripping.
Summary of the invention
In view of the deficiencies in the prior art and insufficient, the purpose of the present invention is to propose to one kind to prevent host porthole from hiding
Disconnected solenoid valve failure causes the control method of unit tripping.The control method can close corresponding direction valve and pitch in time
Instruction improves the economy of unit operation so that the stabilization of EH oil pressure be maintained to ensure unit normal operation.
The technical scheme is that
A kind of control method for preventing host porthole blocking solenoid valve failure from causing unit tripping, comprising the following steps:
When interdicting solenoid valve and breaking down, if wiring loosening or when short circuit in blocking solenoid valve control circuit, triggers corresponding adjust
The fast OFF signal of pressure of door, the signal value that triggering selection each scan period closes all the way, another way triggering by solenoid valve by
Normal control mode is switched to failsafe valve control mode, and valve command is set 0, EH oil is blocked to enter oil motor；High, the middle main vapour of pressure
When each quick closing valve solenoid valve of door issues disconnection signal, which operates corresponding main inlet throttle-stop valve direction valve linkage function block, closes
Corresponding direction valve；
If interdict solenoid valve internal transmission part bite, when unit operates normally, corresponding valve the first quick closing valve solenoid valve and
Second quick closing valve solenoid valve electriferous state, valve command be greater than 8%, valve position feedback in off position, EH oil main-piping pressure
Delay certain time triggers failsafe valve after meeting simultaneously less than 150bar, and valve command is down to 0, blocks EH by valve-closing limit
Oil enters oil motor.
In preferred technical solution, the certain time is 10s.
Compared with prior art, the invention has the advantages that
The control method closes the instruction of corresponding direction valve and pitch by modifying control logic in time, to maintain EH oil pressure
Stabilization ensure unit normal operation, improve the economy of unit operation.
Detailed description of the invention
The invention will be further described with reference to the accompanying drawings and embodiments:
Fig. 1 is oil motor operation principle schematic diagram；
Fig. 2 is pitch control principle drawing of the present invention；
Fig. 3 is solenoid valve bite control logic schematic diagram of the present invention.
Specific embodiment
In order to make the objectives, technical solutions and advantages of the present invention clearer, With reference to embodiment and join
According to attached drawing, the present invention is described in more detail.It should be understood that these descriptions are merely illustrative, and it is not intended to limit this hair
Bright range.In addition, in the following description, descriptions of well-known structures and technologies are omitted, to avoid this is unnecessarily obscured
The concept of invention.
A kind of control method for preventing host porthole blocking solenoid valve failure from causing unit tripping, comprising the following steps:
When blocking solenoid valve breaks down, failure includes internal transmission part bite and connects to interdicting in solenoid valve control circuit
Line loosens or short circuit, causes system EH oil pressure to drop quickly to group setup value, so as to cause the accident of unit tripping.For not
Same failure, modifies different control logics, is controlled.
1: for blocking solenoid valve broken string, relay protective scheme modification is as shown in Figure 2.
By testing solenoid valve control route, when broken string, corresponding solenoid valve control logical AND field device
Linkage function block F_CH_DO can issue solenoid valve " PASS OUT " " for " 1 " signal in time.It will be right by computer configuration
" broken string " signal of the solenoid valve of valve is answered to communicate from FAIL SALIF container to 417 controllers, extremely through 417 controller communications
In FM458 controller, configuration is into the control logic of corresponding valve, and specifically Fig. 2-pitch control principle is shown in control.Note 1 in figure, when
PASS OUT signal is set " 1 " when, trigger the fast OFF signal of pressure of corresponding pitch, signal triggering selection each scan period all the way
Valve is switched to failsafe valve control mode by normal control mode by the value (i.e. preset quick closing valve value) of closing, another way triggering, will
Valve command reset blocks EH oil to enter oil motor.High, each quick closing valve solenoid valve of intermediate pressure main stop valve issues " PASS OUT " signal
When, which operates corresponding main inlet throttle-stop valve direction valve functional block, closes corresponding direction valve, blocks EH oil to enter oil dynamic；
To keep EH system oil pressure to stablize, it is ensured that stable operation of unit.
2: being directed to quick closing valve solenoid valve internal transmission part bite, cause the logic Modification of unit tripping, as shown in Figure 3.
When generation acts incomplete phenomena to solenoid valve in action process, the phenomenon that occurring is the decline of EH oil pressure, valve
Cause unit tripping when instruction is big with position feedback deviation and instruction value is greater than value of feedback.Logic Modification is as follows thus:
When unit operates normally, corresponding valve quick closing valve solenoid valve 1,2 is greater than 8%, valve location in electriferous state, valve command
Feedback is in off position, EH oil main-piping pressure is less than 150bar while the 10 seconds triggering failsafe valve valve-closings that are delayed after meeting limit
Valve command is down to " 0 ", delay 10 seconds adjustable according to system condition, blocks EH oil to enter oil motor, to keep EH
System oil pressure is stablized, it is ensured that stable operation of unit.
It should be understood that above-mentioned specific embodiment of the invention is used only for exemplary illustration or explains of the invention
Principle, but not to limit the present invention.Therefore, that is done without departing from the spirit and scope of the present invention is any
Modification, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.In addition, appended claims purport of the present invention
Covering the whole variations fallen into attached claim scope and boundary or this range and the equivalent form on boundary and is repairing
Change example.
Claims (2)
1. a kind of prevent host porthole blocking solenoid valve failure from causing the control method of unit tripping, which is characterized in that including with
Lower step:
When interdicting solenoid valve and breaking down, if wiring loosening or when short circuit in blocking solenoid valve control circuit, triggers corresponding adjust
The fast OFF signal of pressure of door, the signal value that triggering selection each scan period closes all the way, another way triggering by solenoid valve by
Normal control mode is switched to failsafe valve control mode, and valve command is set 0, EH oil is blocked to enter oil motor；High, the middle main vapour of pressure
When each quick closing valve solenoid valve of door issues disconnection signal, which operates corresponding main inlet throttle-stop valve direction valve linkage function block, closes
Corresponding direction valve；
If interdict solenoid valve internal transmission part bite, when unit operates normally, corresponding valve the first quick closing valve solenoid valve and
Second quick closing valve solenoid valve electriferous state, valve command be greater than 8%, valve position feedback in off position, EH oil main-piping pressure
Delay certain time triggers failsafe valve after meeting simultaneously less than 150bar, and valve command is down to 0, blocks EH by valve-closing limit
Oil enters oil motor.
2. the control method according to claim 1 for preventing host porthole blocking solenoid valve failure from causing unit tripping,
It is characterized in that, the certain time is 10s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811188733.7A CN109404065B (en) | 2018-10-12 | 2018-10-12 | Control method for preventing unit tripping caused by failure of main engine valve interruption electromagnetic valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811188733.7A CN109404065B (en) | 2018-10-12 | 2018-10-12 | Control method for preventing unit tripping caused by failure of main engine valve interruption electromagnetic valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109404065A true CN109404065A (en) | 2019-03-01 |
| CN109404065B CN109404065B (en) | 2021-12-17 |
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| CN201811188733.7A Active CN109404065B (en) | 2018-10-12 | 2018-10-12 | Control method for preventing unit tripping caused by failure of main engine valve interruption electromagnetic valve |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110173310A (en) * | 2019-05-09 | 2019-08-27 | 岭澳核电有限公司 | A kind of steam turbine for nuclear power station steam valve regulating system and its method of controlling security |
| CN113586173A (en) * | 2021-08-31 | 2021-11-02 | 鄂尔多斯市君正能源化工有限公司热电分公司 | Method for judging jam of steam turbine governor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110173310A (en) * | 2019-05-09 | 2019-08-27 | 岭澳核电有限公司 | A kind of steam turbine for nuclear power station steam valve regulating system and its method of controlling security |
| CN110173310B (en) * | 2019-05-09 | 2022-05-24 | 岭澳核电有限公司 | Steam valve adjusting system of steam turbine of nuclear power station and safety control method thereof |
| CN113586173A (en) * | 2021-08-31 | 2021-11-02 | 鄂尔多斯市君正能源化工有限公司热电分公司 | Method for judging jam of steam turbine governor |
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| Publication number | Publication date |
|---|---|
| CN109404065B (en) | 2021-12-17 |
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