CN117287638A - Nuclear power station main water supply flow control valve air supply system and transformation method - Google Patents
Nuclear power station main water supply flow control valve air supply system and transformation method Download PDFInfo
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- CN117287638A CN117287638A CN202311139532.9A CN202311139532A CN117287638A CN 117287638 A CN117287638 A CN 117287638A CN 202311139532 A CN202311139532 A CN 202311139532A CN 117287638 A CN117287638 A CN 117287638A
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- valve
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- water supply
- main water
- solenoid valve
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 238000011426 transformation method Methods 0.000 title abstract description 5
- 238000000034 method Methods 0.000 claims description 8
- 238000009420 retrofitting Methods 0.000 claims 1
- 238000009434 installation Methods 0.000 abstract description 4
- 230000004044 response Effects 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 3
- 238000004458 analytical method Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009257 reactivity Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
- F17D1/04—Pipe-line systems for gases or vapours for distribution of gas
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/005—Protection or supervision of installations of gas pipelines, e.g. alarm
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Safety Devices In Control Systems (AREA)
Abstract
The disclosure belongs to the technical field of nuclear power, and particularly relates to a nuclear power station main water supply flow control valve air supply system and a transformation method. According to the gas supply system of the main water supply flow control valve of the nuclear power station, the solenoid valves of the main water supply valves are modified on site to form the valve groups to form a plurality of gas supply paths, so that the main water supply flow control valve is prevented from being closed due to gas loss under the condition that a single solenoid valve fails, the reliability of the main water supply valve is greatly improved, and the shutdown risk caused by the failure of single equipment is reduced. Under the arrangement scheme of the present disclosure, the air path reconstruction and lifting can be carried out on site, no additional device is needed, and through air path analysis, any valve failure can not cause the air loss closing of the water supply valve. The effect of the installation position of the valve bank is tested in response on site, the purpose of rapidly closing the valve can be achieved, and the closing time is calculated to meet the design requirement.
Description
Technical Field
The invention belongs to the technical field of nuclear power, and particularly relates to a nuclear power station main water supply flow control valve air supply system and a transformation method.
Background
The main feed water flow control valve of the nuclear power plant is used to control the feed water flow of the evaporator, which would lose feed water if this valve were closed during operation, resulting in shut down.
For the main water supply flow control valve of some types of units, two electromagnetic valves are arranged on the pressure air supply loop for the instrument in a serial connection mode, any electromagnetic valve loses signals or loses electricity, and the valve is closed when losing air. Since the reactivity of the relevant model of unit reactor is negative temperature coefficient, the temperature of the main loop is reduced, so that the power of the reactor is increased. Therefore, when the shutdown system acts, a signal is sent to disconnect the power supply of the main water supply flow electromagnetic valve so as to quickly close the main water supply flow control valve, and the power rise caused by the fact that the primary loop is continuously cooled is avoided.
However, if any problem occurs in the control loop of the electromagnetic valve during the operation of the unit, such as failure of a control clamp, failure of the electromagnetic valve, or loosening of a wiring, the failure of the electromagnetic valve can be directly caused, and the water supply of the evaporator is lost to stop the stack, so that the control loop of the main water supply flow control valve needs to be ensured to be in a normal state during the operation of the unit.
Disclosure of Invention
In order to overcome the problems in the related art, the air supply system of the main water supply flow control valve of the nuclear power station and the transformation method are provided.
According to an aspect of the disclosed embodiments, there is provided a nuclear power plant main feedwater flow control valve gas supply system, the system including: a plurality of main water supply valves and valve groups;
the valve group consists of a plurality of electromagnetic valves, the electromagnetic valves form a plurality of air paths connected in parallel, and the valve group is connected between an external air source and a plurality of water supply valves;
under the condition that all electromagnetic valves in the valve group are electrified, compressed air of an external air source is divided into a plurality of air paths by the valve group and then summarized to a common air supply pipe for output, the output end of the common air supply pipe is divided into three output pipes, and each output pipe transmits air to a main water supply valve.
In one possible implementation manner, each air path comprises a first electromagnetic valve, a second electromagnetic valve and a third electromagnetic valve, wherein an air inlet of the first electromagnetic valve is connected with an air source, an air outlet of the first electromagnetic valve is connected with an air inlet of the second electromagnetic valve, an air outlet of the second electromagnetic valve is connected with an air inlet end of the common air conveying pipe, and air outlets of the first electromagnetic valve and the second electromagnetic valve are connected with an air outlet of the third electromagnetic valve;
under the condition that the electromagnetic valves of the valve group are all electrified, in each air passage, external compressed air is sequentially output to the common air supply pipe through the first electromagnetic valve and the second electromagnetic valve, and under the condition that the electromagnetic valves of the valve group are all electrified, residual gas at the downstream of the valve group flows back to the third electromagnetic valve and is discharged through the third electromagnetic valve.
In one possible implementation, a positioner, an amplifier and a quick-release valve are sequentially connected between each output pipe and the main water supply valve.
In one possible implementation, the air inlet end and the air outlet end of each air channel in the valve group are respectively connected with a manual needle valve.
According to an aspect of the disclosed embodiments, there is provided a method for modifying an air supply system of a main feedwater flow control valve of a nuclear power plant, the method including:
step 1, under the working condition of shutdown, the air source of a main water supply valve is cut off, and the main water supply valve is closed;
step 2, removing the wiring of the original electromagnetic valve of each main water supply valve, and marking corresponding electromagnetic valves on each connecting wire;
step 3, after all the electromagnetic valves on each main water supply valve are removed, the positioner and the amplifier of the main water supply valve are connected by an instrument pressure air straight pipe;
step 4, disconnecting each main water supply valve from the connected air supply pipe;
step 5, selecting an air supply pipe positioned at the middle position as a common air supply pipe of each main water supply valve;
step 6, connecting the disassembled electromagnetic valves and the manual needle valves of the instruments into a valve group, wherein in the valve group, the electromagnetic valves form a plurality of parallel gas paths, and the gas inlet end and the gas outlet end of each gas path are respectively connected with one manual needle valve;
and 7, connecting an inlet of the valve bank with an external air source, and under the condition that all electromagnetic valves in the valve bank are powered on, collecting compressed air of the external air source to a common air supply pipe for output after being divided into a plurality of air paths, wherein an output end of the common air supply pipe is divided into three output pipes, and each output pipe transmits air to a main water supply valve.
In one possible implementation manner, each air path comprises a first electromagnetic valve, a second electromagnetic valve and a third electromagnetic valve, wherein an air inlet of the first electromagnetic valve is connected with an air source, an air outlet of the first electromagnetic valve is connected with an air inlet of the second electromagnetic valve, an air outlet of the second electromagnetic valve is connected with an air inlet end of a common air conveying pipe, air outlets of the first electromagnetic valve and the second electromagnetic valve are connected with an air outlet of the third electromagnetic valve, and under the condition that the electromagnetic valves in the valve group are all electrified, external compressed air is sequentially output to the common air supply pipe through the first electromagnetic valve and the second electromagnetic valve; under the condition that the electromagnetic valves in the valve group are all powered off, residual gas at the downstream of the valve group in each gas path flows back to the third electromagnetic valve and is discharged through the third electromagnetic valve.
The beneficial effects of the present disclosure are: according to the gas supply system of the main water supply flow control valve of the nuclear power station, the solenoid valves of the main water supply valves are modified on site to form the valve groups to form a plurality of gas supply paths, so that the main water supply flow control valve is prevented from being closed due to gas loss under the condition that a single solenoid valve fails, the reliability of the main water supply valve is greatly improved, and the shutdown risk caused by the failure of single equipment is reduced. Under the arrangement scheme of the present disclosure, the air path reconstruction and lifting can be carried out on site, no additional device is needed, and through air path analysis, any valve failure can not cause the air loss closing of the water supply valve. The effect of the installation position of the valve bank is tested in response on site, the purpose of rapidly closing the valve can be achieved, and the closing time is calculated to meet the design requirement.
Drawings
FIG. 1 is a schematic diagram of a nuclear power plant main feedwater flow control valve air supply system, according to an example embodiment.
Detailed Description
The invention will be described in further detail with reference to the accompanying drawings and specific examples.
In the related art, an electromagnetic valve is used for controlling an air supply air path of an air cylinder of a main water supply valve, and the main water supply valve is opened under the condition that the electromagnetic valve is powered on; when the electromagnetic valve is powered off, the gas path of the electromagnetic valve is switched, so that the main water supply valve at the downstream is powered off, the evaporator loses main water supply, and the liquid level quickly drops to a shutdown value to cause shutdown. Typically, each solenoid valve has three ports, port 1 being an inlet port, port 2 being an outlet port, and port 3 being an outlet port. When the electromagnetic valve is powered on, the air outlet is closed, the air inlet is communicated with the air outlet, and compressed air is supplied to downstream equipment through the air inlet and the air outlet 2. When the solenoid valve is de-energized, the air inlet is closed, the air outlet is in communication with the air outlet, air supply from the air inlet is lost, and downstream air flows from port 2 to port 3 and then is vented to atmosphere, such that downstream load is de-aerated.
FIG. 1 is a schematic diagram of a nuclear power plant main feedwater flow control valve air supply system, according to an example embodiment. As shown in fig. 1, the system includes: a plurality of main water supply valves and valve groups;
the valve group consists of a plurality of electromagnetic valves, the electromagnetic valves form a plurality of air paths connected in parallel, and the valve group is connected between an external air source and a plurality of water supply valves;
under the condition that all electromagnetic valves in the valve group are electrified, compressed air of an external air source is divided into a plurality of air paths by the valve group and then summarized to a common air supply pipe for output, the output end of the common air supply pipe is divided into three output pipes, and each output pipe transmits air to a main water supply valve.
And under the condition that all electromagnetic valves in the valve bank are electrified, air at the downstream of the valve bank flows back to the valve bank and is discharged to the outside from all air paths of the valve bank.
In one possible implementation manner, each air path comprises a first electromagnetic valve, a second electromagnetic valve and a third electromagnetic valve, wherein an air inlet of the first electromagnetic valve is connected with an air source, an air outlet of the first electromagnetic valve is connected with an air inlet of the second electromagnetic valve, an air outlet of the second electromagnetic valve is connected with an air inlet end of the common air conveying pipe, and air outlets of the first electromagnetic valve and the second electromagnetic valve are connected with an air outlet of the third electromagnetic valve;
under the condition that the electromagnetic valves of the valve group are all electrified, in each air passage, external compressed air is sequentially output to the common air supply pipe through the first electromagnetic valve and the second electromagnetic valve, and under the condition that the electromagnetic valves of the valve group are all electrified, residual gas at the downstream of the valve group flows back to the third electromagnetic valve and is discharged through the third electromagnetic valve.
In one possible implementation, a positioner, an amplifier and a quick-release valve are sequentially connected between each output pipe and the main water supply valve.
In one possible implementation, the air inlet end and the air outlet end of each air channel in the valve group are respectively connected with a manual needle valve.
In one possible implementation manner, a method for modifying an air supply system of a main feed water flow control valve of a nuclear power plant is provided, and the method comprises the following steps:
and step 1, under the working condition of shutdown, the air source of the main water supply valve is disconnected, and the main water supply valve is closed.
Step 2, removing the wiring of the original electromagnetic valve of each main water supply valve, and marking corresponding electromagnetic valves on each connecting line, for example, three main water supply valves are arranged in the original connecting lines: the method comprises the steps that ARE031VL, ARE032VL and ARE033VL, each main water supply valve is connected with two electromagnetic valves, and then the electromagnetic valve connecting lines on the ARE031VL of the main water supply valves ARE marked as ARE031#1 and ARE031#2; the solenoid valve connecting lines on the main water supply valve ARE032VL ARE marked as ARE032#1 and ARE 032; the solenoid valve connection lines on the main water feed valve ARE033VL ARE labeled ARE033#1, ARE033#2.
And 3, installing the electromagnetic valve of each main water supply valve in the original connecting line between the positioner and the amplifier of the main water supply valve, and changing the position between the positioner and the amplifier of the main water supply valve into an instrument pressure straight pipe connection after all the electromagnetic valves on each main water supply valve are removed.
And 4, each main water supply valve in the original connecting line is provided with an air supply pipe respectively, and each main water supply valve is disconnected with the connected air supply pipe.
And 5, selecting the air supply pipe positioned at the middle position as a common air supply pipe of each main water supply valve. A metal plate is mounted beside the tube for the installation of the solenoid valve block.
And 6, connecting the disassembled electromagnetic valves and the manual needle valves of the instruments into a valve group, wherein in the valve group, the electromagnetic valves form a plurality of parallel gas paths, and the gas inlet end and the gas outlet end of each gas path are respectively connected with one manual needle valve.
And 7, connecting an inlet of the valve bank with an external air source, and under the condition that all electromagnetic valves in the valve bank are powered on, collecting compressed air of the external air source to a common air supply pipe for output after being divided into a plurality of air paths, wherein an output end of the common air supply pipe is divided into three output pipes, and each output pipe is communicated with a main water supply valve. For example, as shown in fig. 1, the valve group includes two air paths, each air path includes a first electromagnetic valve, a second electromagnetic valve and a third electromagnetic valve, an air inlet of the first electromagnetic valve is connected with an air source, an air outlet of the first electromagnetic valve is connected with an air inlet of the second electromagnetic valve, an air outlet of the second electromagnetic valve is connected with an air inlet end of a common air pipe, air outlets of the first electromagnetic valve and the second electromagnetic valve are connected with an air outlet of the third electromagnetic valve, and under the condition that all 6 electromagnetic valves are electrified, external compressed air is sequentially output to the common air supply pipe through the first electromagnetic valve and the second electromagnetic valve in each air path; under the condition that 6 solenoid valves are all in power failure, residual gas at the downstream of the valve group flows back to the third solenoid valve in each gas circuit and is discharged through the third solenoid valve, and when any valve single point fails, the valve at the downstream cannot lose gas by adopting the valve group connection mode, so that the aim of eliminating shutdown (SPV point) caused by single equipment failure is fulfilled.
In an application example, the effect of the new installation position of the electromagnetic valve is tested in response on site, so that the purpose of quickly closing the valve can be realized, and the closing time is calculated to meet the design requirement.
Under the off-line working condition, the closing time of the valve is tested, and the result shows that the total response time of the valve from full open to full close after change is about 4S through calculation. Since the opening of the main feed valve is about 50% during normal operation, the actual closing time is shorter, about 3 seconds.
The foregoing description of the embodiments of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the improvement of technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (6)
1. A nuclear power plant main feedwater flow control valve air supply system, the system comprising: a plurality of main water supply valves and valve groups;
the valve group consists of a plurality of electromagnetic valves, the electromagnetic valves form a plurality of air paths connected in parallel, and the valve group is connected between an external air source and a plurality of water supply valves;
under the condition that all electromagnetic valves in the valve group are electrified, compressed air of an external air source is divided into a plurality of air paths by the valve group and then summarized to a common air supply pipe for output, the output end of the common air supply pipe is divided into three output pipes, and each output pipe transmits air to a main water supply valve.
2. The system of claim 1, wherein each air circuit comprises a first solenoid valve, a second solenoid valve, and a third solenoid valve, wherein an air inlet of the first solenoid valve is connected to an air source, an air outlet of the first solenoid valve is connected to an air inlet of the second solenoid valve, an air outlet of the second solenoid valve is connected to an air inlet end of the common air delivery pipe, and air outlets of the first solenoid valve and the second solenoid valve are connected to an air outlet of the third solenoid valve;
under the condition that the electromagnetic valves of the valve group are all electrified, in each air passage, external compressed air is sequentially output to the common air supply pipe through the first electromagnetic valve and the second electromagnetic valve, and under the condition that the electromagnetic valves of the valve group are all electrified, residual gas at the downstream of the valve group flows back to the third electromagnetic valve and is discharged through the third electromagnetic valve.
3. The system of claim 1, wherein a positioner, an amplifier and a quick drain valve are connected in series between each output pipe and the main water supply valve.
4. The system of claim 1, wherein the inlet and outlet ends of each air passage in the valve block are each connected to a manual needle valve.
5. A method for retrofitting a gas supply system of a main feedwater flow control valve of a nuclear power plant, the method comprising:
step 1, under the working condition of shutdown, the air source of a main water supply valve is cut off, and the main water supply valve is closed;
step 2, removing the wiring of the original electromagnetic valve of each main water supply valve, and marking corresponding electromagnetic valves on each connecting wire;
step 3, after all the electromagnetic valves on each main water supply valve are removed, the positioner and the amplifier of the main water supply valve are connected by an instrument pressure air straight pipe;
step 4, disconnecting each main water supply valve from the connected air supply pipe;
step 5, selecting an air supply pipe positioned at the middle position as a common air supply pipe of each main water supply valve;
step 6, connecting the disassembled electromagnetic valves and the manual needle valves of the instruments into a valve group, wherein in the valve group, the electromagnetic valves form a plurality of parallel gas paths, and the gas inlet end and the gas outlet end of each gas path are respectively connected with one manual needle valve;
and 7, connecting an inlet of the valve bank with an external air source, and under the condition that all electromagnetic valves in the valve bank are powered on, collecting compressed air of the external air source to a common air supply pipe for output after being divided into a plurality of air paths, wherein an output end of the common air supply pipe is divided into three output pipes, and each output pipe transmits air to a main water supply valve.
6. The method according to claim 1, wherein each air path includes a first solenoid valve, a second solenoid valve and a third solenoid valve, an air inlet of the first solenoid valve is connected to an air source, an air outlet of the first solenoid valve is connected to an air inlet of the second solenoid valve, an air outlet of the second solenoid valve is connected to an air inlet end of the common air supply pipe, air outlets of the first solenoid valve and the second solenoid valve are connected to an air outlet of the third solenoid valve, and in case that the solenoid valves in the valve block are all powered, external compressed air is sequentially output to the common air supply pipe through the first solenoid valve and the second solenoid valve; under the condition that the electromagnetic valves in the valve group are all powered off, residual gas at the downstream of the valve group in each gas path flows back to the third electromagnetic valve and is discharged through the third electromagnetic valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311139532.9A CN117287638A (en) | 2023-09-06 | 2023-09-06 | Nuclear power station main water supply flow control valve air supply system and transformation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311139532.9A CN117287638A (en) | 2023-09-06 | 2023-09-06 | Nuclear power station main water supply flow control valve air supply system and transformation method |
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| Publication Number | Publication Date |
|---|---|
| CN117287638A true CN117287638A (en) | 2023-12-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311139532.9A Pending CN117287638A (en) | 2023-09-06 | 2023-09-06 | Nuclear power station main water supply flow control valve air supply system and transformation method |
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| Country | Link |
|---|---|
| CN (1) | CN117287638A (en) |
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2023
- 2023-09-06 CN CN202311139532.9A patent/CN117287638A/en active Pending
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