CN116085677A - Nuclear power plant instrument air system and control method - Google Patents

Nuclear power plant instrument air system and control method Download PDF

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Publication number
CN116085677A
CN116085677A CN202310056783.4A CN202310056783A CN116085677A CN 116085677 A CN116085677 A CN 116085677A CN 202310056783 A CN202310056783 A CN 202310056783A CN 116085677 A CN116085677 A CN 116085677A
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China
Prior art keywords
isolation valve
air
power plant
nuclear power
controller
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CN202310056783.4A
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Chinese (zh)
Inventor
缪正强
马柏松
马元华
张国军
田伟
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Shandong Nuclear Power Co Ltd
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Shandong Nuclear Power Co Ltd
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Priority to CN202310056783.4A priority Critical patent/CN116085677A/en
Publication of CN116085677A publication Critical patent/CN116085677A/en
Pending legal-status Critical Current

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    • 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
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/06—Cooling; Heating; Prevention of freezing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B41/00—Pumping installations or systems specially adapted for elastic fluids
    • F04B41/02—Pumping installations or systems specially adapted for elastic fluids having reservoirs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B41/00—Pumping installations or systems specially adapted for elastic fluids
    • F04B41/06—Combinations of two or more pumps
    • 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
    • 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
    • F17D3/18—Arrangements for supervising or controlling working operations for measuring the quantity of conveyed product
    • 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
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21D—NUCLEAR POWER PLANT
    • G21D1/00—Details of nuclear power plant

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)

Abstract

The invention belongs to the technical field of air compressors of nuclear power plants and discloses a nuclear power plant instrument air system and a control method, wherein the nuclear power plant instrument air system comprises an air compression assembly and an air source supply assembly, a manual isolation valve, a pneumatic isolation valve, an electric isolation valve, a controller and a pressure gauge are sequentially arranged from an external air source to an isolation valve bank, the manual isolation valve can manually disconnect or connect the external air source with the isolation valve bank, the pneumatic isolation valve and the electric isolation valve are controlled by a power plant protection and safety monitoring system, the two valves are normally closed, when the pressure value of the air compression assembly measured by the pressure gauge is reduced to a pressure setting value, the controller opens the pneumatic isolation valve and the electric isolation valve, the external air source supplies air, workers need to respond as soon as possible, faults are removed, the air compression assembly supplies air as soon as possible, and the external air source and the air compression assembly are conveniently isolated after the external air source and the isolation valve are received a closing signal from the safety monitoring system is received, and the instrument air system of the nuclear power plant is ensured not to supply compressed air for the instrument.

Description

Nuclear power plant instrument air system and control method
Technical Field
The invention relates to the technical field of air compressors of nuclear power plants, in particular to an instrument air system of a nuclear power plant and a control method.
Background
The passive nuclear power plant is provided with an instrument air system, which is one of important constituent structures and is used for providing compressed air for various non-safety or safety-related pneumatic valves so as to support the normal operation and start-stop of the power plant. Valves very important for safe shutdown and accident alleviation are designed to be in a failure safe state after losing compressed air, and if an instrument air system cannot provide enough compressed air, a plurality of safety-related pneumatic valves automatically act and open or close to directly cause the conditions of reactor shutdown, turbine shutdown and the like, so that electric energy cannot be transmitted to the outside in a short time of a power plant.
To solve this problem, existing instrument air systems include two air compressors, either of which is capable of continuously providing 100% capacity pneumatic valve air, which in operation emits a significant amount of heat that is carried away by the equipment cooling water system. If the equipment cooling water system is in fault, the cooling water supply is easy to be insufficient, and because the air operated valve is operated normally, the equipment cooling water system, the instrument air system and the factory water system can be operated normally, if the two air compressors are in failure, after a few minutes, the compressed air stored by the two air storage tanks of the instrument air system is exhausted, the conditions of reactor shutdown, turbine shutdown and the like are directly caused, so that the electric energy cannot be transmitted to the outside in a short time of the power plant, meanwhile, the working personnel need to pay attention to the operation condition of the air compressors in real time, take necessary measures to intervene at any time, and more manpower and material resources are needed to be input.
Therefore, it is one of the easier solutions to connect an air source to the instrument air system of the nuclear power plant. The safety-related pneumatic valve will not actuate as long as the external air source can provide the standby compressed air. However, this also presents another problem, if the air compression assembly fails due to a loss of ac power, a failure of the equipment cooling water system, etc., the safety-related pneumatic valve needs to be actuated to ensure the safety of the nuclear power unit, and the external air source should be reliably isolated from the air compression assembly. Therefore, a need exists for a nuclear power plant instrument air system and control method that addresses the above-described issues.
Disclosure of Invention
According to one aspect of the invention, the instrument air system of the nuclear power plant is provided, other air sources are externally connected to the air compression assembly to provide standby compressed air, and necessary time is provided for staff to take measures to respond and eliminate faults of the air compressor.
In order to solve the problems existing in the prior art, the invention adopts the following technical scheme:
the utility model provides a nuclear power plant instrument air system, includes two parallelly connected air compression subassembly that set up, air compression subassembly includes air compressor machine and gas holder, the input of air compressor machine is connected with the cooling line of equipment cooling water system, the output of air compressor machine with the input of gas holder is connected, the output and the isolation valves of gas holder are connected, nuclear power plant instrument air system still includes:
the air source supply assembly comprises a manual isolation valve, a pneumatic isolation valve, an electric isolation valve, a controller and a pressure gauge, wherein the input end of the manual isolation valve is connected with an external air source, the output end of the manual isolation valve is connected with the input end of the pneumatic isolation valve, the input end of the electric isolation valve is connected with the output end of the pneumatic isolation valve, the output end of the electric isolation valve is connected with the input end of the pressure gauge, the output end of the pressure gauge is connected with the isolation valve group, the controller is in communication connection with the pneumatic isolation valve and the electric isolation valve, and the controller is used for controlling the pneumatic isolation valve and the electric isolation valve to be opened and closed.
Preferably, the instrument air system of the nuclear power plant further comprises an alarm device, and the alarm device is in communication connection with the pneumatic isolation valve and the electric isolation valve.
Preferably, the instrument air system of the nuclear power plant further comprises a thermometer and a flowmeter, wherein the thermometer is arranged on a cooling water pipeline of the air compressor in parallel, the flowmeter is arranged on the cooling water pipeline of the air compressor in series, the thermometer is in communication connection with the controller, and the flowmeter is in communication connection with the controller.
Preferably, the number of the thermometers and the flowmeters is plural, the thermometers are arranged in parallel, and the flowmeters are arranged in series.
Preferably, the instrument air system of the nuclear power plant further comprises a plurality of undervoltage relays, the undervoltage relays are electrically connected with a power supply circuit of the air compressor, and the undervoltage relays are in communication connection with the controller.
Preferably, the nuclear power plant instrument air system further comprises a pressure reducing valve, wherein the input end of the pressure reducing valve is connected with the manual isolation valve, and the output end of the pressure reducing valve is communicated with the pneumatic isolation valve.
Preferably, the nuclear power plant instrument air system further comprises a check valve, wherein an input end of the check valve is connected with an output end of the pressure reducing valve, and an output end of the check valve is connected with an input end of the pneumatic isolation valve.
According to another aspect of the present invention, there is provided a control method of a nuclear power plant instrument air system, by implementation of the above nuclear power plant instrument air system, the control method of the nuclear power plant instrument air system comprising:
s100: starting the external air source, confirming that the manual isolation valve is at an open position, and connecting the external air source with an instrument air system;
s200: when the pressure gauge detects that the pressure value of the air compression assembly is reduced to a pressure setting value, the controller opens the pneumatic isolation valve and the electric isolation valve.
Preferably, the instrument air system of the nuclear power plant further comprises a thermometer and a flowmeter, wherein the thermometer and the flowmeter are both arranged on a cooling water pipeline of the air compressor in parallel, the thermometer is in communication connection with the controller, and the flowmeter is in communication connection with the controller;
the nuclear power plant instrument air system control method further comprises the following steps:
s300: the temperature meter and the flow meter monitor the temperature and the flow of two air compressors, when any numerical value of the temperature and the flow of one air compressor is lower than a temperature setting value or a flow setting value, the cooling water pipe of the equipment cooling water system corresponding to the air compressor is judged to be abnormal, when any numerical value of the temperature and the flow of the two air compressors is lower than the setting value, the cooling water pipe of the equipment cooling water system corresponding to the two air compressors is judged to be abnormal, and the controller closes the pneumatic isolation valve and the electric isolation valve.
Preferably, the instrument air system of the nuclear power plant further comprises a plurality of undervoltage relays, the undervoltage relays are electrically connected with a power supply circuit of the air compressor, and the undervoltage relays are in communication connection with the controller;
the nuclear power plant instrument air system control method further comprises the following steps:
s400: the under-voltage relay monitors the power supply voltage of the air compressor or the bus voltage of the power supply system, when the power supply voltage of the air compressor is lower than a voltage setting value, the abnormality of a power supply line of the air compressor is judged, and the controller closes the pneumatic isolation valve and the electric isolation valve.
The beneficial effects of the invention are as follows:
according to the instrument air system of the nuclear power plant, the manual isolation valve, the pneumatic isolation valve, the electric isolation valve, the controller and the pressure gauge are sequentially arranged from the external air source to the isolation valve bank, the manual isolation valve can manually disconnect or connect the external air source with the isolation valve bank, the pneumatic isolation valve and the electric isolation valve are controlled by the power plant protection and safety monitoring system, the two valves are normally closed, and when the pressure value of the air compression assembly measured by the pressure gauge is reduced to a pressure setting value, the controller opens the pneumatic isolation valve and the electric isolation valve, and air is supplied by the external air source. At this time, the staff needs to respond as soon as possible, remove the fault, and recover the air supply of the air compression assembly as soon as possible. When the closing signal from the safety monitoring system is received, the pneumatic isolating valve and the electric isolating valve are closed, so that an external air source and a downstream user are isolated, the instrument air system of the nuclear power plant is ensured not to supply compressed air for the instrument, and the phenomenon of 'refusal' of the downstream valve user of the instrument air system of the nuclear power plant is prevented.
According to the control method for the instrument air system of the nuclear power plant, the external air source is started through implementation of the instrument air system of the nuclear power plant, the manual isolation valve is opened, and when the pressure value of the air compression assembly measured by the pressure gauge is reduced to the pressure setting value, the controller opens the pneumatic isolation valve and the electric isolation valve. The external air source is used as a backup compressed air source of an instrument air system of the nuclear power plant, necessary time is provided for staff to take measures to respond and eliminate faults of an air compressor, and under the condition of losing alternating current, the pneumatic isolation valve and the electric isolation valve are closed, so that the external air source is isolated, and the safety of the nuclear power plant is ensured.
Drawings
FIG. 1 is a schematic illustration of a nuclear power plant instrument air system in accordance with an embodiment of the present invention;
FIG. 2 is a first logic diagram of the closing of the pneumatic isolation valve and the electric isolation valve according to an embodiment of the present invention;
FIG. 3 is a second logic diagram of closing the pneumatic isolation valve and the electric isolation valve according to an embodiment of the present invention;
FIG. 4 is a flow chart of a method for controlling an instrument air system of a nuclear power plant in an embodiment of the invention.
Reference numerals:
1. an air compressor; 2. a gas storage tank; 3. a buffer tank; 4. a dryer; 5. a non-return valve; 6. an isolation valve group; 7. a manual isolation valve; 8. a pneumatic isolation valve; 9. an electric isolation valve; 10. a controller; 11. a pressure gauge; 12. a pressure reducing valve; 13. a check valve; 14. a thermometer; 15. a flow meter; 16. an undervoltage relay.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.
The existing instrument air system comprises two air compressors, wherein either air compressor can continuously provide 100% capacity of pneumatic valve air, and a large amount of heat is released during operation and is taken away by a device cooling water system. If the equipment cooling water system is in fault, the cooling water supply is easy to be insufficient, and because the air operated valve is operated normally, the equipment cooling water system, the instrument air system and the factory water system can be operated normally, if the two air compressors are in failure, after a few minutes, the compressed air stored by the two air storage tanks of the instrument air system is exhausted, the reactor is stopped, the steam turbine is stopped and the like, so that the electric energy cannot be transmitted to the outside in a short time of the power plant, meanwhile, the working personnel need to pay attention to the operation condition of the air compressors in real time, take necessary measures to intervene at any time, and more manpower and material resources are needed to be input. In this regard, the embodiment provides a nuclear power plant instrument air system, and other air sources are externally connected to the air compression assembly to provide standby compressed air, so that necessary time is provided for staff to take measures to respond and eliminate air compressor faults.
As shown in fig. 1-3, in this embodiment, the instrument air system of the nuclear power plant includes two air compression assemblies arranged in parallel, the air compression assemblies include air compressors 1, a buffer tank 3, a dryer 4, a check valve 5, an air storage tank 2 and an isolation valve, each air compressor 1 can continuously provide 100% air consumption of the pneumatic valve, and if both air compressors 1 fail, the compressed air stored in the air storage tank 2 can meet the air consumption of the pneumatic valve of the power plant for 4 minutes. The air compressor 1 emits a large amount of heat during operation, the generated heat is taken away by the equipment cooling water system, the equipment cooling water system transfers the heat to the water system of the factory through the heat exchanger, the water system of the factory takes seawater from the circulating water pump room, the seawater is discharged to the sea after flowing through the heat exchanger, and the heat generated by the equipment such as the air compressor is finally discharged to the sea in the process. The passive nuclear power plant is simultaneously provided with a plant air system, and the instrument air system of the nuclear power plant and the plant air system can be connected with each other. The instrument air system of the nuclear power plant further comprises an air source supply assembly, the air source supply assembly comprises a manual isolation valve 7, a pneumatic isolation valve 8, an electric isolation valve 9, a controller 10 and a pressure gauge 11, the input end of the manual isolation valve 7 is connected with an external air source, the output end of the manual isolation valve 7 is connected with the input end of the pneumatic isolation valve 8, the input end of the electric isolation valve 9 is connected with the output end of the pneumatic isolation valve 8, the output end of the electric isolation valve 9 is connected with the input end of the pressure gauge 11, the output end of the pressure gauge 11 is connected with the isolation valve group 6, the controller 10 is in communication connection with the pneumatic isolation valve 8 and the electric isolation valve 9, and the controller 10 is used for controlling the pneumatic isolation valve 8 and the electric isolation valve 9 to be opened and closed. Specifically, the external air source comprises an existing nitrogen system of a passive nuclear power plant, a factory air system or an air compressor system additionally provided with other large-capacity air tanks, a manual isolation valve 7, a pneumatic isolation valve 8, an electric isolation valve 9, a controller 10 and a pressure gauge 11 are sequentially arranged from the external air source to the isolation valve group 6, the manual isolation valve 7 can manually disconnect or connect the external air source with the isolation valve group 6, the pneumatic isolation valve 8 and the electric isolation valve 9 are controlled by a power plant protection and safety monitoring system, the two valves are normally closed, when the pressure gauge 11 measures that the pressure value of an air compression assembly is reduced to a pressure setting value, the pressure gauge 11 sends a high level to the controller 10, and the controller 10 can open the pneumatic isolation valve 8 and the electric isolation valve 9 to supply air by the external air source. At this time, the staff needs to respond as soon as possible, remove the fault, and recover the air supply of the air compression assembly as soon as possible. When the closing signal from the safety monitoring system is received, the pneumatic isolating valve and the electric isolating valve are closed to ensure the isolation of an external air source and a downstream user, so that the phenomenon that the downstream valve user generates 'refusal action' in the instrument air system of the nuclear power plant is prevented, the downstream valve user acts under the condition of losing compressed air, and the downstream valve user does not act due to the continuous air supply of the downstream valve user, namely 'refusal action'. The two isolation valves are used in series, and one is pneumatic and the other is electric, so that the diversity of the valves is improved.
Further, with continued reference to fig. 1-3, the nuclear power plant instrument air system further includes an alarm device in communication with the pneumatic isolation valve 8 and the electric isolation valve 9. Specifically, when the pressure value of the air compression assembly measured by the pressure gauge 11 is reduced to a pressure setting value, the pressure gauge 11 sends a high level to the controller 10, the pneumatic isolation valve 8 and the electric isolation valve 9 are opened through the controller 10, an alarm signal is sent through the alarm device to prompt the air compressor 1 to be in fault, a standby air source is started to prompt a worker to respond as soon as possible, when the pressure value of the air compression assembly measured by the pressure gauge 11 is higher than the pressure setting value after the fault is removed, the pressure gauge 11 sends a low level to the controller 10, the pneumatic isolation valve 8 and the electric isolation valve 9 are closed through the controller 10, and the alarm device stops alarming.
Further, with continued reference to fig. 1-3, the instrument air system of the nuclear power plant further includes a thermometer 14 and a flowmeter 15, the thermometer 14 is disposed in parallel on the cooling water pipeline of the air compressor 1, the flowmeter 15 is disposed in series on the cooling water pipeline of the air compressor 1, the thermometer 14 is in communication connection with the controller 10, and the flowmeter 15 is in communication connection with the controller 10. Specifically, the number of the thermometers 14 and the flowmeters 15 is plural, the plural thermometers 14 are arranged in parallel, and the plural flowmeters 15 are arranged in series. Namely, 4 thermometers 14 and 4 flowmeters 15 are arranged on a pipeline for providing cooling water for each air compressor 1 and are used for monitoring the temperature and the flow of the cooling water so as to judge whether the cooling water of the equipment is abnormal, when any signal of the temperature and the flow of the cooling pipeline of the two air compressors 1 is abnormal, the cooling water of the equipment is judged to be in failure, a low level is sent to the controller 10 through the safety monitoring system, the controller 10 can control the pneumatic isolation valve 8 and the electric isolation valve 9 to be closed, and the external air source is ensured to be isolated.
Further, with continued reference to fig. 1-3, the nuclear power plant instrument air system further includes a plurality of under-voltage relays 16, the plurality of under-voltage relays 16 being electrically connected to the power supply line of the air compressor 1, the under-voltage relays 16 being communicatively connected to the controller 10. Specifically, in this embodiment, 4 under-voltage relays 16 are provided for detecting the low voltage of the power transmission line, and when the voltage is lower than a preset value, the safety monitoring system sends a low level to the controller 10, and the controller 10 can control the pneumatic isolation valve 8 and the electric isolation valve 9 to be closed, so as to ensure that the external air source is isolated.
Further, with continued reference to fig. 1-3, the nuclear power plant instrument air system further includes a pressure reducing valve 12, an input end of the pressure reducing valve 12 is connected to the manual isolation valve 7, and an output end of the pressure reducing valve 12 is disposed in communication with the pneumatic isolation valve 8. Specifically, the pressure reducing valve 12 can reduce the air pressure of the external air source to be consistent with the pressure of the whole instrument air system, and can also take the air source with higher air pressure as standby compressed air.
Further, with continued reference to fig. 1-3, the nuclear power plant instrument air system further includes a check valve 13, an input of the check valve 13 being connected to an output of the pressure relief valve 12, and an output of the check valve 13 being connected to an input of the pneumatic isolation valve 8. In particular, the check valve 13 may prevent the reverse flow of compressed air to a source that provides other sources of air.
The embodiment also provides a control method for the instrument air system of the nuclear power plant, as shown in fig. 4, by implementing the instrument air system of the nuclear power plant, the control method for the instrument air system of the nuclear power plant comprises the following steps:
s100: and starting an external air source, confirming that the manual isolation valve 7 is in an open position, and connecting the external air source with an instrument air system.
S200: when the pressure gauge 11 measures that the pressure value of the air compression assembly decreases to the pressure setting value, the controller 10 opens the pneumatic isolation valve 8 and the electric isolation valve 9.
When the pressure value of the air compression assembly measured by the pressure gauge 11 is reduced to a pressure setting value, the pressure gauge 11 sends a high level to the controller 10, the pneumatic isolation valve 8 and the electric isolation valve 9 are opened through the controller 10, an alarm signal is sent through the alarm device to prompt the air compressor 1 to fail, a standby air source is started to prompt a worker to respond as soon as possible, when the pressure value of the air compression assembly measured by the pressure gauge 11 is higher than the pressure setting value after the failure is removed, the pressure gauge 11 sends a low level to the controller 10, the pneumatic isolation valve 8 and the electric isolation valve 9 are closed through the controller 10, and the alarm device stops alarming.
S300: the thermometer 14 and the flowmeter 15 monitor the temperature and the flow of the two air compressors 1, when any value of the temperature and the flow of one of the air compressors 1 is lower than a temperature setting value or a flow setting value, the cooling water pipe of the equipment cooling water system corresponding to the air compressor 1 is judged to be abnormal, when any value of the temperature and the flow of the two air compressors 1 is lower than the setting value, the cooling water pipe of the equipment cooling water system corresponding to the two air compressors 1 is judged to be abnormal, and the controller 10 closes the pneumatic isolation valve 8 and the electric isolation valve 9.
And 4 thermometers 14 and 4 flow meters 15 are arranged on a pipeline for providing cooling water for each air compressor 1 and are used for monitoring the temperature and the flow of the cooling water so as to judge whether the cooling water of the equipment is abnormal, when any numerical value of the temperature and the flow of one air compressor 1 is lower than a temperature setting value or a flow setting value, four-out-of-two logic is adopted, and when measured values measured by two or more thermometers 14 and flow meters 15 are lower than the setting value, a logic true value is output to judge the abnormality of the cooling water pipe of the cooling water system of the equipment corresponding to the air compressor 1. When any signal of the temperature and the flow on the cooling pipelines of the two air compressors 1 is abnormal, the equipment cooling water fault is judged, a low level is sent to the controller 10 through the safety monitoring system, and the controller 10 can control the pneumatic isolation valve 8 and the electric isolation valve 9 to be closed, so that the external air source is isolated.
S400: the under-voltage relay 16 monitors the power supply voltage of the air compressor 1 or the bus voltage of the power supply system, and when the power supply voltage of the air compressor 1 is lower than a voltage setting value, the abnormality of the power supply line of the air compressor 1 is judged, and the controller 10 closes the pneumatic isolation valve 8 and the electric isolation valve 9.
The method comprises the steps of setting 4 undervoltage relays 16 for detecting low voltage of a power transmission line or power supply voltage of an air compressor 1, generating a logic true value by the undervoltage relays 16 when the voltage is lower than a setting value, adopting a logic of four to two, judging an alternating current fault when the logic true value is generated by two or more undervoltage relays 16, sending low level to a controller 10 through a safety monitoring system, controlling the pneumatic isolation valve 8 and the electric isolation valve 9 to be closed by the controller 10, and ensuring that an external air source is isolated, thereby ensuring safety of a nuclear power plant.
According to the control method for the instrument air system of the nuclear power plant, through implementation of the instrument air system of the nuclear power plant, an external air source is started, the manual isolation valve 7 is confirmed to be in an open position, the external air source is connected with the instrument air system, and when the pressure value of the air pressure component measured by the pressure gauge 11 is reduced to a pressure setting value, the controller 10 opens the pneumatic isolation valve 8 and the electric isolation valve 9. The external air source is used as a backup compressed air source of an instrument air system of the nuclear power plant, necessary time is provided for staff to take measures to respond and eliminate faults of the air compressor 1, and under the condition of losing alternating current, the pneumatic isolation valve 8 and the electric isolation valve 9 are closed to ensure that the external air source is isolated, so that the safety of the nuclear power plant is ensured.
It is to be understood that the above examples of the present invention are provided for clarity of illustration only and are not limiting of the embodiments of the present invention. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the invention. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.

Claims (10)

1. The utility model provides an instrument air system of nuclear power plant, includes two parallelly connected air compression subassembly that sets up, air compression subassembly includes air compressor machine (1) and gas holder (2), the input of air compressor machine (1) is connected with the cooling line of equipment cooling water system, the output of air compressor machine (1) with the input of gas holder (2) is connected, the output of gas holder (2) is connected with isolation valves (6), its characterized in that, instrument air system of nuclear power plant still includes:
the air source supply assembly comprises a manual isolation valve (7), a pneumatic isolation valve (8), an electric isolation valve (9), a controller (10) and a pressure gauge (11), wherein the input end of the manual isolation valve (7) is connected with an external air source, the output end of the manual isolation valve (7) is connected with the input end of the pneumatic isolation valve (8), the input end of the electric isolation valve (9) is connected with the output end of the pneumatic isolation valve (8), the output end of the electric isolation valve (9) is connected with the input end of the pressure gauge (11), the output end of the pressure gauge (11) is connected with the isolation valve set (6), the controller (10) is connected with the pneumatic isolation valve (8) and the electric isolation valve (9) in a communication mode, and the controller (10) is used for controlling the pneumatic isolation valve (8) and the electric isolation valve (9) to be opened and closed.
2. The nuclear power plant instrument air system according to claim 1, further comprising an alarm device in communication with the pneumatic isolation valve (8) and the electric isolation valve (9).
3. The nuclear power plant instrument air system according to claim 1, further comprising a thermometer (14) and a flowmeter (15), wherein the thermometer (14) is arranged on a cooling water pipeline of the air compressor (1) in parallel, the flowmeter (15) is arranged on the cooling water pipeline of the air compressor (1) in series, the thermometer (14) is in communication connection with the controller (10), and the flowmeter (15) is in communication connection with the controller (10).
4. A nuclear plant instrument air system according to claim 3, characterized in that the number of said thermometers (14) and said flowmeters (15) is plural, a plurality of said thermometers (14) being arranged in parallel, a plurality of said flowmeters (15) being arranged in series.
5. The nuclear power plant instrument air system according to claim 1, further comprising a plurality of under-voltage relays (16), a plurality of the under-voltage relays (16) being electrically connected to a power supply line of the air compressor (1), the under-voltage relays (16) being communicatively connected to the controller (10).
6. The nuclear power plant instrument air system according to claim 1, further comprising a pressure reducing valve (12), an input of the pressure reducing valve (12) being connected to the manual isolation valve (7), an output of the pressure reducing valve (12) being arranged in communication with the pneumatic isolation valve (8).
7. The nuclear power plant instrument air system according to claim 6, further comprising a check valve (13), an input of the check valve (13) being connected to an output of the pressure relief valve (12), an output of the check valve (13) being connected to an input of the pneumatic isolation valve (8).
8. A method for controlling a nuclear power plant instrument air system, characterized in that the method for controlling a nuclear power plant instrument air system comprises the steps of:
s100: starting the external air source, confirming that the manual isolation valve (7) is at an open position, and connecting the external air source with an instrument air system;
s200: when the pressure gauge (11) detects that the pressure value of the air compression assembly is reduced to a pressure setting value, the controller (10) opens the pneumatic isolation valve (8) and the electric isolation valve (9).
9. The method for controlling the instrument air system of the nuclear power plant according to claim 8, wherein the instrument air system of the nuclear power plant further comprises a thermometer (14) and a flowmeter (15), the thermometer (14) and the flowmeter (15) are both arranged on a cooling water pipeline of the air compressor (1) in parallel, the thermometer (14) is in communication connection with the controller (10), and the flowmeter (15) is in communication connection with the controller (10);
the nuclear power plant instrument air system control method further comprises the following steps:
s300: the temperature meter (14) and the flow meter (15) monitor the temperature and the flow of the two air compressors (1), when any numerical value of the temperature and the flow of one air compressor (1) is lower than a temperature setting value or a flow setting value, the cooling water pipe of the equipment cooling water system corresponding to the air compressor (1) is judged to be abnormal, when any numerical value of the temperature and the flow of the two air compressors (1) is lower than a setting value, the cooling water pipe of the equipment cooling water system corresponding to the two air compressors (1) is judged to be abnormal, and the controller (10) closes the pneumatic isolation valve (8) and the electric isolation valve (9).
10. The method for controlling the instrument air system of the nuclear power plant according to claim 8, wherein the instrument air system of the nuclear power plant further comprises a plurality of under-voltage relays (16), the plurality of under-voltage relays (16) are electrically connected with a power supply line of the air compressor (1), and the under-voltage relays (16) are in communication connection with the controller (10);
the nuclear power plant instrument air system control method further comprises the following steps:
s400: the under-voltage relay (16) monitors the power supply voltage of the air compressor (1) or the bus voltage of a power supply system, when the power supply voltage of the air compressor (1) is lower than a voltage setting value, the abnormality of a power supply line of the air compressor (1) is judged, and the controller (10) closes the pneumatic isolation valve (8) and the electric isolation valve (9).
CN202310056783.4A 2023-01-17 2023-01-17 Nuclear power plant instrument air system and control method Pending CN116085677A (en)

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CN202310056783.4A CN116085677A (en) 2023-01-17 2023-01-17 Nuclear power plant instrument air system and control method

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CN202310056783.4A CN116085677A (en) 2023-01-17 2023-01-17 Nuclear power plant instrument air system and control method

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CN116085677A true CN116085677A (en) 2023-05-09

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