CN111736501A - Gas intrusion monitoring and exhausting device and method for cooling water system of power plant - Google Patents

Gas intrusion monitoring and exhausting device and method for cooling water system of power plant Download PDF

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Publication number
CN111736501A
CN111736501A CN202010448234.8A CN202010448234A CN111736501A CN 111736501 A CN111736501 A CN 111736501A CN 202010448234 A CN202010448234 A CN 202010448234A CN 111736501 A CN111736501 A CN 111736501A
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China
Prior art keywords
gas
cooling water
reed switch
water system
reed
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Chinese (zh)
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赵丰
温福新
牛宗涛
杨爱生
张清
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Northwest Electric Power Research Institute of China Datang Corp Science and Technology Research Institute Co Ltd
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Northwest Electric Power Research Institute of China Datang Corp Science and Technology Research Institute Co Ltd
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Priority to CN202010448234.8A priority Critical patent/CN111736501A/en
Publication of CN111736501A publication Critical patent/CN111736501A/en
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    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00—Programme-control systems
    • G05B19/02—Programme-control systems electric
    • G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
    • G05B19/0423—Input/output
    • G05B19/0425—Safety, monitoring
    • 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
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
    • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
    • F25D17/02—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating liquids, e.g. brine
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/18—Status alarms

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Thermal Sciences (AREA)
  • Automation & Control Theory (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Motor Or Generator Cooling System (AREA)

Abstract

The invention discloses a gas intrusion monitoring and exhausting device and a gas intrusion monitoring and exhausting method for a cooling water system of a power plant, which comprise a gas monitoring chamber, wherein the bottom end of the gas monitoring chamber is connected with a gas collection chamber through an upper flange; according to the gas intrusion monitoring and exhausting device for the cooling water system of the power plant, gas can be effectively collected by arranging the gas collection chamber, so that smooth gas discharge is facilitated; by arranging the magnet, the reed switch and the controller, the position of the floating ball is guaranteed to be monitored at any time, so that whether gas enters in the operation process is determined; the electric valve and the controller are arranged, so that the opening and closing of the electric valve can be remotely operated, and the system can smoothly exhaust; the exhaust method of the invention has simple operation, solves the problem of effectively monitoring and automatically discharging the gas invaded by the cooling water system, and has good practical value.

Description

Gas intrusion monitoring and exhausting device and method for cooling water system of power plant
Technical Field
The invention belongs to the field of cooling water systems of power plants, and particularly relates to a gas intrusion monitoring and exhausting device of a cooling water system of a power plant.
Background
In the field of power generation, there are two types of cooling water in thermal power plants: closed cooling water and open cooling water.
Thermal power plants rely on closed cooling water to cool auxiliary equipment for boilers, turbines and generators. The closed cooling water is communicated with a machine system, a furnace system and an electric system at the same time, the faults of the closed cooling water have extremely adverse effects on the operation of the whole system equipment, and the closed cooling water is shut down when serious; in view of economy, the department power plant uses open cooling water to cool the auxiliary equipment of partial boilers, turbines and generators.
Air compressors (air compressors for short) are important auxiliary equipment in power plants, and high-power air compressors are generally cooled by cooling water. Moisture liquefaction among the air compression process constantly corrodes air compressor machine cooler inner wall under other impurity effects, may corrode and wear the cooler inner wall, leads to the condition emergence that high-pressure gas invades cooling water system.
When a certain amount of gas is invaded into a cooling water system, the pressure fluctuation of cooling water can be caused, the operation of each auxiliary machine cooler is influenced, and the operation risk is formed. Until now, water leakage faults of air compressor coolers have occurred many times in China, and gas enters a cooling water system. The gas causes pressure fluctuation and accumulates in a local high position of a cooling water system, such as an external water pipe of the hydrogen cooler of the generator, so that an air plug is formed, and the normal operation of the hydrogen cooler is seriously influenced.
Once the problem of cooling water gas intrusion occurs, the time for finding the fault point is long, and a field worker needs to check a plurality of devices to determine the fault point; there is a situation where the thermal power plant has tripped after a fault point has occurred but the fault point has not been determined.
Disclosure of Invention
The invention aims to provide a gas intrusion monitoring and exhausting device for a cooling water system of a power plant, which solves the problem that the existing equipment cannot exhaust the intrusion gas of the cooling water system.
The second purpose of the invention is to provide a gas intrusion monitoring exhaust method for a cooling water system of a power plant.
The first technical scheme adopted by the invention is that the gas intrusion monitoring and exhausting device of the cooling water system of the power plant comprises a gas monitoring chamber, the bottom end of the gas monitoring chamber is connected with a gas collection chamber through an upper flange, the top end of the gas monitoring chamber is sequentially connected with an electric valve and an exhaust pipe, and the gas monitoring chamber is also electrically connected with a controller.
The present invention is also characterized in that,
the gas monitoring chamber comprises a circular truncated cone-shaped upper shell and an inverted bell-shaped lower shell which are connected with each other;
a columnar inner channel is arranged in the center of the upper shell, a magnet capable of moving relatively in the vertical direction is arranged on the inner wall of the inner channel, a reed switch a and a reed switch b are further arranged along the radial direction of the upper shell, and the reed switch a, the reed switch b and the electric valve are all electrically connected with the controller;
the bottom end of the inner channel is also provided with a breathable fixing piece;
the lower shell is internally provided with a vertical connecting rod, one end of the connecting rod is connected with the floating ball, and the other end of the connecting rod is fixedly connected with the magnet.
The reed switch a and the reed switch b are respectively positioned at the upper end and the lower end of the upper shell.
And a sealing ring is arranged at the contact position of the upper shell and the lower shell.
The controller comprises a single chip microcomputer, the single chip microcomputer is respectively electrically connected with an isolation optocoupler a and an isolation optocoupler b, the isolation optocoupler a is electrically connected with a reed switch a, and the isolation optocoupler b is electrically connected with a reed switch b;
the singlechip is also electrically connected with the power amplification module and the electric valve in sequence;
the single chip microcomputer is further sequentially electrically connected with the EEPROM module, the key, the display module and the 485 communication module, and the 485 communication module is electrically connected with the DCS.
The model of the singlechip is STM32F 407;
the isolation optocoupler a and the isolation optocoupler b both adopt isolation optocoupler chips with the model number of TLP 521;
the power amplification module specifically comprises a relay with the model number of JQX-62F-2Z.
The EEPROM module adopts an EEPROM chip, and the model of the EEPROM chip is AT 25256;
the key and display module comprises an LCD control chip, and the model of the LCD control chip is ILI 9320;
the 485 communication module comprises a 485 communication chip with the model number ADM 3485E.
The second technical scheme adopted by the invention is that the gas intrusion monitoring and exhausting method for the cooling water system of the power plant comprises the following steps:
step 1, before a cooling water system is put into operation, an initial gas intrusion monitoring and exhausting device
The electric valve is opened, gas accumulated in the gas intrusion monitoring exhaust device is exhausted from the inner channel and the exhaust pipe through the breathable fixing piece, the floating ball floats upwards and contacts with the sealing ring under the buoyancy action of cooling water, at the moment, the connecting rod drives the magnet to be close to the reed switch a and enables the reed switch a to be attracted, attraction action information of the reed switch a enters the single chip microcomputer through the isolation optocoupler a, action information of the reed switch a is stored in the EEPROM module, meanwhile, the action information of the reed switch a is transmitted to the DCS through the 485 communication module, and at the moment, the electric valve is closed;
step 2, after the initialization is finished, putting the cooling water system into operation
When no gas exists in the cooling water entering the gas collection chamber, the gas enters the monitoring exhaust device and is filled with liquid, the electric valve is closed, the floating ball floats and is positioned at the top end of the inner part of the lower shell and is in close contact with the sealing ring, the connecting rod drives the magnet to be close to the reed pipe a and enables the reed pipe a to be attracted for a long time, attraction state information of the reed pipe a enters the single chip microcomputer through the isolation optical coupler a, state information of the reed pipe a is stored in the EEPROM module, and meanwhile, the state information of the reed pipe a is periodically transmitted to the DCS through the 485 communication module;
when cooling water entering the gas collection chamber carries gas, the gas enters the inner channel through the breathable fixing piece, the floating ball is pressed to move downwards along with the gradual increase of the gas, the magnet also moves downwards under the action of the floating ball and the connecting rod, when the magnet is close to the reed pipe b and enables the reed pipe b to be attracted, action information of the reed pipe b enters the single chip microcomputer through the isolation optocoupler b, action information of the reed pipe b is stored in the EEPROM module, at the moment, the action information of the reed pipe b is transmitted to the DCS system through the 485 communication module and is fed back to operators, meanwhile, the single chip microcomputer controls the opening of the electric valve through the power amplification module, the gas is discharged, the floating ball, the connecting rod and the magnet gradually rise along with the liquid level, after the exhaust is finished, the reed pipe a is attracted, the attraction action information of the reed pipe a enters the single chip microcomputer through the isolation optocoupler a, the action information of the reed pipe a is stored in the EEPROM module, and the action, the single chip microcomputer controls the electric valve to be closed through the power amplification module, and the device is recovered to a state without gas invasion.
The invention has the beneficial effects that: according to the gas intrusion monitoring and exhausting device for the cooling water system of the power plant, gas can be effectively collected by arranging the gas collection chamber, so that smooth gas discharge is facilitated; by arranging the magnet, the reed switch and the controller, the position of the floating ball is guaranteed to be monitored at any time, so that whether gas enters in the operation process is determined; the electric valve and the controller are arranged, so that the opening and closing of the electric valve can be remotely operated, and the system can smoothly exhaust; the exhaust method of the invention has simple operation, solves the problem of effectively monitoring and automatically discharging the gas invaded by the cooling water system, and has good practical value.
Drawings
FIG. 1 is a schematic diagram of a gas intrusion monitoring exhaust device of a cooling water system of a power plant according to the present invention;
FIG. 2 is a schematic diagram of a controller in an exhaust apparatus for monitoring gas intrusion in a cooling water system of a power plant according to the present invention;
FIG. 3 is a diagram showing the state of the gas intrusion monitoring exhaust device of the cooling water system of the power plant.
In the figure, 1, a gas collection chamber, 1-1, a side flange, 1-2, an upper flange, 2, a gas monitoring chamber, 2-1, an upper shell, 2-2, a lower shell, 2-3, a floating ball, 2-4, a connecting rod, 2-5, a magnet, 2-6, a sealing ring, 2-7, a breathable fixing piece, 2-8, a reed pipe a, 2-9, a reed pipe b, 2-10, an inner channel, 3, an electric valve, 4, a controller, 5, an exhaust pipe, 6, an EEPROM module, 7, a single chip microcomputer, 8, an isolation optical coupler a, 9, an isolation optical coupler b, 10.485 communication module, 11, DCS system, 12, a key and display module and 13, a power amplification module are arranged;
011-cooling water pump I, 012-cooling water pump II, 021-cooling water cooler I, 022-cooling water cooler II, 031-air compressor cooler I, 032-air compressor cooler II, 0311-air compressor cooler I water inlet valve, 0312-air compressor cooling I water outlet valve, 0321-air compressor cooler II water inlet valve, 0322-air compressor cooler II water outlet valve, 041-power plant cooling water system gas intrusion monitoring exhaust device I, 042-power plant cooling water system gas intrusion monitoring exhaust device II, 051-power generator hydrogen cooler I and 052-power generator hydrogen cooler II.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention discloses a gas intrusion monitoring and exhausting device for a cooling water system of a power plant, which comprises a gas monitoring chamber 2, wherein the bottom end of the gas monitoring chamber 2 is connected with a gas collection chamber 1 through an upper flange 1-2, the top end of the gas monitoring chamber 2 is sequentially connected with an electric valve 3 and an exhaust pipe 5, and the gas monitoring chamber 2 is also electrically connected with a controller 4. The controller 4 is used for receiving suction signals of a reed pipe a2-8 and a reed pipe b2-8 in the gas monitoring chamber 2, controlling the switch of the electric valve 3 and sending out gas intrusion alarm.
The electric valve 3 adopts an electric ball valve with signal feedback.
Both ends of the gas collection chamber 1 are connected with an external water pipe through side flanges 1-1; the horizontal cross section in the gas collection chamber 1 gradually increases along with the water flow direction, so that gas is ensured to easily enter the gas monitoring chamber 2.
The gas monitoring chamber 2 comprises a circular truncated cone-shaped upper shell 2-1 and an inverted bell-shaped lower shell 2-2 which are connected with each other;
a columnar inner channel 2-10 is arranged in the center of the upper shell 2-1, a magnet 2-5 capable of relatively moving in the vertical direction is arranged on the inner wall of the inner channel 2-10, a reed switch a2-8 and a reed switch b2-9 are further arranged along the radial direction of the upper shell 2-1, and the reed switch a2-8, the reed switch b2-9 and the electric valve 3 are all electrically connected with the controller 4;
the bottom end of the inner channel 2-10 is also provided with a breathable fixing piece 2-7;
a vertical connecting rod 2-4 is arranged in the lower shell 2-2, one end of the connecting rod 2-4 is connected with the floating ball 2-3, and the other end of the connecting rod 2-4 penetrates through the ventilation fixing piece 2-7 to be fixedly connected with a magnet 2-5.
The reed switch a2-8 and the reed switch b2-9 are respectively positioned at the upper end and the lower end of the upper shell 2-1, the reed switch a2-8 and the reed switch b2-8 are respectively attracted with the magnet 2-5 to indicate the position of the gas in the gas monitoring chamber 2, and the gas intrusion alarm is given out.
And a sealing ring 2-6 is also arranged at the contact part of the upper shell 2-1 and the lower shell 2-2, so that the gas monitoring chamber 2 is sealed and airtight.
As shown in fig. 2, the controller 4 comprises a single chip microcomputer 7, the single chip microcomputer 7 is respectively electrically connected with an isolation optocoupler a8 and an isolation optocoupler b9, the isolation optocoupler a8 is electrically connected with a reed switch a2-8, and the isolation optocoupler b9 is electrically connected with a reed switch b 2-9;
the singlechip 7 is also electrically connected with the power amplification module 13 and the electric valve 3 in sequence;
the singlechip 7 is also electrically connected with the EEPROM module 6, the key and display module 12 and the 485 communication module 10 in sequence, and the 485 communication module 10 is electrically connected with the DCS system 11.
The type of the singlechip 7 is STM32F 407; the isolation optocoupler a8 and the isolation optocoupler b9 both adopt isolation optocoupler chips with the model number of TLP 521; the power amplification module 13 specifically comprises a relay with the model number JQX-62F-2Z.
The EEPROM module 6 adopts an EEPROM chip, and the model of the EEPROM chip is AT 25256; the key and display module 12 comprises an LCD control chip, and the model of the LCD control chip is ILI 9320; the 485 communication module 10 comprises a 485 communication chip with the model number ADM 3485E.
The reed switch a2-8 and the reed switch b2-9 are used for sensing the liquid level inside the device. When the magnet 2-5 is close to the reed switch a2-8 and the reed switch b2-9, the magnet can attract the reed switch. The suction of the reed pipe a2-8 shows that the liquid has reached the highest position, which indicates that no gas exists in the device; the reed pipe b2-9 is pulled to show that the liquid has reached the lowest position, which indicates that the air in the device is full.
The isolation optocoupler is used for sending a reed switch signal to the singlechip on the premise of electrical isolation. The attraction state information of the reed pipe a2-8 is sent to the singlechip 7 through the isolation optocoupler a8, and the attraction state information of the reed pipe b2-9 is sent to the singlechip 7 through the isolation optocoupler b 9.
The 485 communication module 10 is used for communication between the singlechip 7 and the DCS system 11.
The power amplifying module 13 is used for amplifying a control signal of the low-power electric valve 3 sent by the singlechip 7 so as to control the opening and closing of the electric valve 3.
The key and display module 12 is a human-machine interface for on-site status display and parameter setting.
The button and display module 12 is used for displaying and setting the status of the device.
The EEPROM chip 6 is used for storing parameters set manually and information such as action history of the reed switch a2-8 and the reed switch b 2-9.
The singlechip 7 is used for sending action information of the reed pipe a2-8 and the reed pipe b2-9 to the DCS 11 through the 485 communication module 10 and controlling the electric valve 3 to be opened and closed, so that monitoring and discharging of gas in the cooling water system are achieved.
The invention discloses a gas intrusion monitoring and exhausting method for a cooling water system of a power plant, which comprises the following steps:
step 1, before a cooling water system is put into operation, an initial gas intrusion monitoring and exhausting device
The electric valve 3 is opened, gas accumulated in the gas intrusion monitoring exhaust device is exhausted from an inner channel 2-10 and an exhaust pipe 5 through a breathable fixing piece 2-7, a floating ball 2-3 floats upwards and contacts with a sealing ring 2-6 under the buoyancy effect of cooling water, at the moment, a connecting rod 2-4 drives a magnet 2-5 to be close to a reed pipe a2-8 and enable the reed pipe a2-8 to be sucked, the sucking action information of the reed pipe a2-8 enters a single chip microcomputer 7 through an isolation optical coupler a8, the action information of the reed pipe a2-8 is stored in an EEPROM module 6, meanwhile, the action information of the reed pipe a2-8 is transmitted to a DCS (distributed control system) 11 through a 485 communication module 10, and at the moment, the electric valve 3 is closed;
step 2, after the initialization is finished, putting the cooling water system into operation
When no gas exists in the cooling water entering the gas collection chamber 1, the gas intrusion monitoring exhaust device is filled with liquid, the electric valve 3 is closed, the floating ball 2-3 floats and is positioned at the top end inside the lower shell 2-2 and is tightly contacted with the sealing ring 2-6, the connecting rod 2-4 drives the magnet 2-5 to be close to the reed switch a2-8 and enables the reed switch a2-8 to be attracted for a long time, attraction state information of the reed switch a2-8 enters the singlechip 7 through the isolation optocoupler a8, state information of the reed switch a2-8 is stored in the EEPROM module 6, and meanwhile, the state information of the reed switch a2-8 is periodically transmitted to the DCS system 11 through the 485 communication module 10;
when cooling water entering the gas collection chamber 1 carries gas, the gas enters the inner channel 2-10 through the breathable fixing piece 2-7, the floating ball 2-3 is pressed to move downwards along with the gradual increase of the gas, the magnet 2-5 also moves downwards under the action of the floating ball 2-3 and the connecting rod 2-4, when the magnet 2-5 is close to the reed switch b2-9 and the reed switch b2-9 is attracted, the action information of the reed switch b2-9 enters the singlechip 7 through the isolation optical coupler b9, the action information of the reed switch b2-9 is stored in the EEPROM module 6, at the moment, the action information of the reed switch b2-9 is transmitted to the DCS system 11 through the 485 communication module 10 and is fed back to operators, meanwhile, the singlechip 7 controls the electric valve 3 to be opened through the power amplification module 13, the gas is discharged, and the floating ball 2-3, the connecting rod 2-4 and the magnet 2-5 gradually rise along with the liquid level, after the exhaust is finished, the reed switch a2-8 is attracted, attraction action information of the reed switch a2-8 enters the singlechip 7 through the isolation optocoupler a8, action information of the reed switch a2-8 is stored in the EEPROM module 6, meanwhile action information of the reed switch a2-8 is transmitted to the DCS system 11 through the 485 communication module 10, the singlechip 7 controls the electric valve 3 to be closed through the power amplification module 13, and the device is restored to a state without air intrusion.
When a large amount of gas continuously invades into the cooling water system and is collected by the gas collection chamber 1, the suction states of the reed pipe a2-8 and the reed pipe b2-9 are frequently changed along with the fluctuation of the floating ball 2-3 along with the invaded gas; in order to prevent severe gas intrusion from adversely affecting the device of the present invention, the minimum time T for opening the electric valve 3 is provided in the EEPROM module 6ONMINAnd the minimum time T for closing the electric valve of the electric valveOFFMINThe key and display module 12 or the DCS system may be used for setting.
When the electric valve 3 is opened until the time reachesTONMINIn the electric valve 3 is forced to open no matter the signal state of the reed switch a2-8 and the reed switch b 2-9.
When the electric valve 3 is closed until the time reaches TOFFMINIn the electric valve 3 is forced to close no matter the signal states of the reed switch a2-8 and the reed switch b 2-9.
Examples
As shown in fig. 3, the cooling water is driven by a first cooling water pump 011 and a second cooling water pump 012, and then is cooled by a first cooling water cooler 021 and a second cooling water cooler 022, and then is delivered to each cooler, specifically including a first air compressor cooler 031, a second air compressor cooler 032, a first generator hydrogen cooler 051, a second generator hydrogen cooler 052, and the like; and returning water of each cooler enters the first cooling water pump 011 and the second cooling water pump 012 again.
The first power plant cooling water system gas intrusion monitoring exhaust device 041 and the second power plant cooling water system gas intrusion monitoring exhaust device 042 are respectively installed on the water outlet sides of the first air compressor cooler 031 and the second air compressor cooler 032. First inlet valve 0311 of air compressor cooler is installed in first 031 of air compressor cooler intake side, first outlet valve 0312 of air compressor cooler is installed in first 031 of air compressor cooler water outlet side, second inlet valve 0321 of air compressor cooler is installed in second 032 of air compressor cooler intake side, and second outlet valve 0322 of air compressor cooler is installed in second 032 of air compressor cooler water outlet side.
When the first 031 or second 032 fault of the first air compressor cooler causes gas to invade the cooling water system, the gas enters the cooling water system from the water outlet side of the fault air compressor cooler and enters the local high level of the cooling water system along with water circulation, such as the first hydrogen cooler 051 and the second hydrogen cooler 052 of the generator. And after the gas invasion monitoring and exhausting device 041 of the cooling water system of the power plant or the gas invasion monitoring and exhausting device 042 of the cooling water system of the power plant monitors the gas invasion, the gas invasion signal is sent to the DCS for exhausting. When the worker closes the water inlet valve and the water outlet valve of the cooler of the failed air compressor, the failure is thoroughly eliminated, and the gas intrusion of the cooling water system is stopped.

Claims (8)

1. The utility model provides a power plant cooling water system gas intrusion monitoring exhaust apparatus, its characterized in that, includes gas monitoring room (2), gas monitoring room (2) bottom is through last flange (1-2) connection collection chamber (1), gas monitoring room (2) top has connected gradually motorised valve (3) and blast pipe (5), gas monitoring room (2) still are connected with controller (4) looks electricity.
2. The gas intrusion monitoring exhaust device for a cooling water system of a power plant as claimed in claim 1, wherein the gas monitoring chamber (2) comprises a truncated cone-shaped upper housing (2-1) and an inverted bell-shaped lower housing (2-2) connected to each other;
a columnar inner channel (2-10) is arranged in the center of the upper shell (2-1), magnets (2-5) capable of moving relatively in the vertical direction are arranged on the inner wall of the inner channel (2-10), a reed switch a (2-8) and a reed switch b (2-9) are further arranged along the radial direction of the upper shell (2-1), and the reed switch a (2-8), the reed switch b (2-9) and the electric valve (3) are all electrically connected with the controller (4);
the bottom end of the inner channel (2-10) is also provided with a breathable fixing piece (2-7);
a vertical connecting rod (2-4) is arranged in the lower shell (2-2), one end of the connecting rod (2-4) is connected with the floating ball (2-3), and the other end of the connecting rod (2-4) is fixedly connected with a magnet (2-5).
3. The gas intrusion monitoring exhaust device for the cooling water system of the power plant as claimed in claim 2, wherein the reed pipes a (2-8) and b (2-9) are respectively located at the upper and lower ends of the upper housing (2-1).
4. The gas intrusion monitoring and exhausting device for the cooling water system of the power plant as claimed in claim 1, wherein a sealing ring (2-6) is further provided at the contact position of the upper casing (2-1) and the lower casing (2-2).
5. The gas intrusion monitoring and exhausting device for the cooling water system of the power plant as claimed in claim 1, wherein the controller (4) comprises a single chip microcomputer (7), the single chip microcomputer (7) is electrically connected with an isolation optocoupler a (8) and an isolation optocoupler b (9) respectively, the isolation optocoupler a (8) is electrically connected with the reed pipe a (2-8), and the isolation optocoupler b (9) is electrically connected with the reed pipe b (2-9);
the single chip microcomputer (7) is also electrically connected with the power amplification module (13) and the electric valve (3) in sequence;
the single chip microcomputer (7) is further sequentially electrically connected with the EEPROM module (6), the key and display module (12) and the 485 communication module (10), and the 485 communication module (10) is electrically connected with the DCS system (11).
6. The gas intrusion monitoring and exhausting device for the cooling water system of the power plant as claimed in claim 5, wherein the single chip microcomputer (7) is of the type STM32F 407;
the isolation optocoupler a (8) and the isolation optocoupler b (9) both adopt isolation optocoupler chips with the model number of TLP 521;
the power amplification module (13) specifically comprises a relay with the model number of JQX-62F-2Z.
7. The gas intrusion monitoring exhaust device for a cooling water system of a power plant as claimed in claim 5, wherein the EEPROM module (6) is an EEPROM chip, and the model number of the EEPROM chip is AT 25256;
the key and display module (12) comprises an LCD control chip, and the model of the LCD control chip is ILI 9320;
the 485 communication module (10) comprises a 485 communication chip with the model number ADM 3485E.
8. A gas intrusion monitoring and discharging method of a gas intrusion monitoring and discharging apparatus for a cooling water system of a power plant according to any one of claims 1 to 7, comprising the steps of:
step 1, before a cooling water system is put into operation, an initial gas intrusion monitoring and exhausting device
The electric valve (3) is opened, gas accumulated in the gas intrusion monitoring exhaust device is exhausted from the inner channel (2-10) and the exhaust pipe (5) through the breathable fixing piece (2-7), the floating ball (2-3) floats upwards and contacts with the sealing ring (2-6) under the buoyancy action of cooling water, at the moment, the connecting rod (2-4) drives the magnet (2-5) to be close to the reed switch a (2-8) and enables the reed switch a (2-8) to be sucked, the sucking action information of the reed switch a (2-8) enters the singlechip (7) through the isolating optocoupler a (8), and the action information of the reed switch a (2-8) is stored in the EEPROM module (6), meanwhile, the action information of the reed pipe a (2-8) is transmitted to a DCS (11) through a 485 communication module (10), and at the moment, the electric valve (3) is closed;
step 2, after the initialization is finished, putting the cooling water system into operation
When no gas exists in cooling water entering the gas collection chamber (1), the gas enters the monitoring exhaust device and is filled with liquid, the electric valve (3) is closed, the floating ball (2-3) floats and is positioned at the top end of the inner part of the lower shell (2-2) and is tightly contacted with the sealing ring (2-6), the connecting rod (2-4) drives the magnet (2-5) to be close to the reed switch a (2-8) and enables the reed switch a (2-8) to be attracted for a long time, attraction state information of the reed switch a (2-8) enters the single chip microcomputer (7) through the isolation optocoupler a (8), state information of the reed switch a (2-8) is stored in the EEPROM module (6), and meanwhile, the state information of the reed switch a (2-8) is periodically transmitted to the DCS system (11) through the 485 communication module (10);
when cooling water entering the gas collection chamber (1) carries gas, the gas enters the inner channel (2-10) through the breathable fixing piece (2-7), the floating ball (2-3) is pressed to move downwards along with the gradual increase of the gas, the magnet (2-5) also moves downwards under the action of the floating ball (2-3) and the connecting rod (2-4), when the magnet (2-5) is close to the reed pipe b (2-9) and enables the reed pipe b (2-9) to be sucked, the action information of the reed pipe b (2-9) enters the singlechip (7) through the isolation optocoupler b (9), the action information of the reed pipe b (2-9) is stored in the EEPROM module (6), and at the moment, the action information of the reed pipe b (2-9) is transmitted to the DCS system (11) through the 485 communication module (10) and is fed back to operators, meanwhile, the single chip microcomputer (7) controls the electric valve (3) to be opened through the power amplification module (13), gas is exhausted while the floating ball (2-3), the connecting rod (2-4) and the magnet (2-5) gradually rise along with the liquid level, after the exhaust is finished, the reed pipe a (2-8) is attracted, attraction action information of the reed pipe a (2-8) enters the single chip microcomputer (7) through the isolation optocoupler a (8), action information of the reed pipe a (2-8) is stored in the EEPROM module (6), meanwhile action information of the reed pipe a (2-8) is transmitted to the DCS system (11) through the 485 communication module (10), the single chip microcomputer (7) controls the electric valve (3) to be closed through the power amplification module (13), and the device is restored to a state without gas intrusion.
CN202010448234.8A 2020-05-25 2020-05-25 Gas intrusion monitoring and exhausting device and method for cooling water system of power plant Pending CN111736501A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113803924A (en) * 2021-09-17 2021-12-17 赵宝玉 Cell refrigerator capable of preventing cell pollution

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113803924A (en) * 2021-09-17 2021-12-17 赵宝玉 Cell refrigerator capable of preventing cell pollution
CN113803924B (en) * 2021-09-17 2023-08-18 山东中科赛奥生物科技有限公司 Cell refrigerator capable of preventing cell pollution

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