An intelligent calibration device applied to the boron concentration monitoring channel of a nuclear power plant

Abstract

The present invention provides an intelligent calibration device applied to the boron concentration monitoring channel of a nuclear power plant, which comprises a housing. A display screen control module is arranged on the outer side surface of the housing. A boron solution water tank is arranged inside the housing. A liquid adding opening, a stirring device and a temperature detection device are arranged at the top of the boron solution water tank. An electric heating wire is arranged inside the boron solution water tank. A boron solution inlet connecting pipe, a diluent bottle, a sampling pipe and a boron solution outlet connecting pipe are arranged outside the boron solution water tank. The diluent bottle and the boron solution water tank are connected together through a diluent pipe. A diluent metering pump is arranged on the diluent pipe. A boron solution metering pump and an electric three-way ball valve are arranged on the boron solution outlet connecting pipe. A waste liquid discharge connecting pipe is arranged on the electric three-way ball valve. The present invention can realize the rapid and continuous calibration of the boron concentration monitoring channel, can adjust the temperature of the boron solution according to the working conditions and ensure the uniformity of the solution, and effectively solves the deficiencies of manual calibration and manual sampling and analysis.

Description

Technical Field

[0001] The invention belongs to the technical field of boron concentration detection channels in pressurized water reactor nuclear power plants, and relates to an intelligent calibration device applied to boron concentration monitoring channels in nuclear power plants. Background Art

[0002] The primary loop of a pressurized water reactor nuclear power plant mainly includes a reactor, a pressurizer, main pumps, and steam generators. The control of the reactor power is achieved by adjusting control rods and boron concentration. Since the reactor power changes significantly when adjusting control rods, during the stable operation of the reactor, the reactor power is mainly adjusted by adding boric acid solution with a certain concentration to the primary loop. On the one hand, during the startup, operation, or power regulation of the reactor, boric acid or diluted boric acid needs to be added to the coolant in the primary loop of the reactor to achieve the compensation control of the reactor reactivity, so as to flatten the reactor power and increase the burnup. On the other hand, during the shutdown, refueling, and overhaul of the reactor, boric acid is used to keep the active zone in a subcritical state for a long time. Since the water in the primary loop needs to be continuously purified through ion exchangers, there is a possibility of boric acid loss. Therefore, the continuous on-line monitoring of the boron concentration in the primary loop of the reactor is a very important task. The boron concentration monitoring device is an indispensable equipment for the safe, stable, and economic operation of nuclear power plants.

[0003] Conventionally, the on-line analysis of the boron concentration of the primary coolant in a pressurized water reactor nuclear power plant uses a boron concentration monitoring channel. With the change of the operating conditions of the primary loop of the nuclear power plant, this monitoring channel will have the problem of a large deviation between the on-line analysis concentration and the off-line manual sampling analysis, and it needs to be calibrated regularly. The current calibration device connects the boron concentration detection channel with a boron solution water tank through a circulation pump, and calibrates by manually adjusting the boron concentration in the water tank. However, the current device has deficiencies such as unable to continuously calibrate, uneven boron solution concentration in the boron solution water tank, lack of temperature control, and low automation. In order to meet the requirements for the solution in the calibration of the boron concentration detection channel and the problem of unable to continuously calibrate, and to solve problems such as long calibration time and dependence on manual concentration adjustment, an intelligent calibration device applied to the boron concentration monitoring channel in a nuclear power plant is researched and invented. Summary of the Invention

[0004] The purpose of the invention is to provide an intelligent calibration device applied to the boron concentration monitoring channel in a nuclear power plant, so as to solve the problems of unable to continuously calibrate, uneven boron solution concentration, lack of temperature control, and low automation in the existing device.

[0005] To achieve the above purpose, the invention adopts the following technical solutions:

[0006] An intelligent calibration device applied to the boron concentration monitoring channel of a nuclear power plant, comprising a housing, on the outer side surface of the housing there is a display screen control module, inside the housing there is a boron solution water tank, on the top of the boron solution water tank there are a liquid adding opening, a stirring device and a temperature detection device, inside the boron solution water tank there is an electric heating wire, on the outside of the boron solution water tank there are a boron solution inlet connection pipe, a dilution liquid bottle, a sampling pipe, and a boron solution outlet connection pipe. The dilution liquid bottle and the boron solution water tank are connected together through a dilution liquid pipe, on the dilution liquid pipe there is a dilution liquid metering pump, on the boron solution outlet connection pipe there are a boron solution metering pump and an electric three-way ball valve, and a waste liquid discharge connection pipe is arranged on the electric three-way ball valve.

[0007] A further technical solution is that a magnetic flip liquid level display is also arranged on the top of the boron solution water tank.

[0008] A further technical solution is that a bracket for supporting the dilution liquid bottle is arranged on the outside of the housing.

[0009] A further technical solution is that a sampling valve is arranged at the end of the sampling pipe.

[0010] A further technical solution is that quick connectors for the boron solution inlet, quick connectors for the boron solution outlet, and quick connectors for the waste liquid discharge are respectively arranged at the ends of the boron solution inlet connection pipe, the boron solution outlet connection pipe, and the waste liquid discharge connection pipe.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] The intelligent calibration device applied to the boron concentration monitoring channel of a nuclear power plant involved in the present invention has the advantages of high automation, modularization, and universality, can realize the rapid and continuous calibration of the boron concentration monitoring channel, can adjust the temperature of the boron solution according to the working conditions and ensure the uniformity of the solution, effectively solve the deficiencies of manual calibration and manual sampling analysis, and realize the automation and continuous high efficiency of the calibration of the boron concentration detection channel. Description of the Drawings

[0013] Figure 1 is a structural schematic diagram of the present invention.

[0014] In the figure: 1. Electric heating wire; 2. Liquid adding opening; 3. Stirring paddle; 4. Electric motor; 5. Temperature detection device; 6. Magnetic flip liquid level display; 7. Dilution liquid metering pump; 8. Quick connector for boron solution inlet; 9. Dilution liquid bottle; 10. Quick connector for waste liquid discharge; 11. Quick connector for boron solution outlet; 12. Sampling valve; 13. Electric three-way ball valve; 14. Boron solution metering pump; 15. Display screen control module; 16. Boron solution water tank; 17. Housing. Detailed Embodiments

[0015] The following further describes in detail the embodiments of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0016] An intelligent calibration device applied to the boron concentration monitoring channel of a nuclear power plant, including a housing 17. A cabinet door is provided on the outer side of the housing 17, which can be opened and closed. A display screen control module 15 is fixedly provided on the cabinet door. Specifically, the display screen in the display screen control module 15 is installed on the cabinet door, with a touch screen and integrated boron meter calibration program software. The display screen control module 15 is used to control the operation of the electric heating wire 1, the motor 4, the temperature detection device 5, the diluent metering pump 7, the electric three-way ball valve 13, and the boron solution metering pump 14 and display information such as temperature curves; Above the interior of the housing 17, there is a boron solution water tank 16 for storing boron solution. On the left side of the top of the boron solution water tank 16, there is a liquid addition opening 2, a stirring device, and a temperature detection device 5. The liquid addition opening 2 is used to quickly add a certain concentration of boron solution into the boron solution water tank 16 before the start of calibration. The stirring device includes a stirring paddle 3 and a motor 4. The stirring paddle 3 is located inside the boron solution water tank 16 and is connected to the motor 4 through a transmission rod. The motor 4 is fixed at the middle position of the top of the boron solution water tank 16 and is used to drive the stirring paddle 3 to rotate at a constant speed. The rotation speed can be changed by adjusting different powers. During calibration, the boron solution in the boron solution water tank 16 is stirred at a constant speed to keep the boron solution in the water tank uniform. The temperature detection device 5 is fixed at a position on the right side of the top of the boron solution water tank 16 and is used to monitor the temperature of the boron solution in the boron solution water tank 16 at any time, and feed back information to the display screen control module 15 to adjust the electric heating wire 1 to keep the solution temperature stable; An electric heating wire 1 is provided inside the boron solution water tank 16. The electric heating wire 1 is fixed on the left side inside the boron solution water tank 16 and is used to maintain the constant temperature of the solution inside the boron solution water tank 16. The power is adjusted by the signal fed back by the temperature detection device 5. A magnetic flip liquid level indicator 6 is also provided on the top of the boron solution water tank 16. The magnetic flip liquid level indicator 6 is fixed at a position on the right side of the top of the boron solution water tank 16, on the right side of the temperature detection device 5, and is used to reflect the liquid level of the solution in the water tank in real time;

[0017] On the outer side of the boron solution water tank 16, there are a boron solution inlet connection pipeline, a dilution liquid bottle 9, a sampling pipeline, and a boron solution outlet connection pipeline. The boron solution inlet connection pipeline, the sampling pipeline, and the boron solution outlet connection pipeline are made of stainless steel. Specifically, the boron solution inlet connection pipeline passes through the housing 17 and is connected to the boron solution water tank 16 inside the housing 17. At the end of the boron solution inlet connection pipeline, there is a boron solution inlet quick connector 8. When the boron solution metering pump 14 pumps the boron solution through the boron meter and then returns it to the boron solution water tank 16 through this boron solution inlet quick connector 8; the dilution liquid bottle 9 is arranged on the outer side of the housing 17 and below the boron solution inlet connection pipeline. The dilution liquid bottle 9 is used to store sufficient demineralized water. A bracket for supporting the dilution liquid bottle 9 is welded below the dilution liquid bottle 9. The dilution liquid bottle 9 is connected to the boron solution water tank 16 through a dilution liquid pipeline. A dilution liquid metering pump 7 is arranged on the dilution liquid pipeline. Under the action of the dilution liquid metering pump 7, a certain volume of demineralized water in the dilution liquid bottle 9 is added to the boron solution water tank 16, thereby completing the dilution of the boron solution. The dilution completion information can be displayed on the display screen control module 15. At the same time, the system is ready to perform the next calibration process; the boron solution outlet connection pipeline is arranged below the boron solution water tank 16. Specifically, at the bottom of the boron solution water tank 16, there is a boron solution outlet connection pipeline in an "L" shape. The boron solution outlet connection pipeline passes through the housing 17 and extends to the outside of the housing 17. A boron solution metering pump 14 and an electric three-way ball valve 13 are arranged on the boron solution outlet connection pipeline. At the end of the boron solution outlet connection pipeline, there is a boron solution outlet quick connector 11. When the boron solution metering pump 14 pumps the boron solution, it is connected to the boron meter through this connector; that is, the solution in the boron solution water tank 16 flows into the boron concentration monitoring channel connected to the boron solution outlet quick connector 11 through the electric three-way ball valve 13 under the action of the boron solution metering pump 14, and returns to the boron solution water tank 16 through the boron solution inlet quick connector 8 after passing through the boron concentration monitoring channel; one end of the sampling pipeline is connected to the boron solution water tank 16 through the boron solution outlet connection pipeline, and the other end passes through the housing 17 and extends to the outside of the housing 17. A sampling valve 12 is arranged at the end of the sampling pipeline for manually sampling the solution in the boron solution water tank 16; a waste liquid discharge connection pipeline is arranged at the bottom of the electric three-way ball valve 13, and a waste liquid discharge quick connector 10 is arranged at the end of the waste liquid discharge connection pipeline. The boron solution in the boron solution water tank 16 is discharged to the outside through this connector; the state of the electric three-way ball valve 13 can be adjusted through the display screen control module 15 to realize the flow direction of the solution in the boron solution water tank 16 (the boron solution flows into the boron concentration monitoring channel or into the waste liquid discharge pipeline). According to the information in the display screen control module 15, a fixed volume of boron solution in the boron solution water tank 16 is pumped by the boron solution metering pump 14 to provide power for the boron solution to pass through the boron meter from the boron solution outlet quick connector 11 and be discharged from the waste liquid discharge quick connector 10.

[0018] Specific usage method and function of this embodiment:

[0019] Before the system starts calibration, a sufficient amount of boric acid solution is added to the boric acid solution water tank 16 through the liquid filling opening 2. The magnetic flip liquid level indicator 6 is used to display the liquid level in the current boric acid solution water tank 16. The temperature detection device 5 feeds back signals to the display control module 15 to adjust the power of the electric heating wire 1, so as to maintain the stability of the solution temperature. The display control module 15 adjusts the rotation speed of the motor 4 to ensure the uniformity of the boric acid solution in the boric acid solution water tank 16. After starting calibration, the boric acid solution metering pump 14 and the electric three-way ball valve 13 are opened. The solution in the boric acid solution water tank 16 flows through the electric three-way ball valve 13 under the action of the boric acid solution metering pump 14 into the boric acid solution outlet quick connector 11, and then returns to the boric acid solution water tank 16 through the boric acid solution inlet quick connector 8 after passing through the boric acid meter (boron concentration monitoring channel) connected to the boric acid solution outlet quick connector 11. The calibration of the boric acid solution at the current concentration is completed and the temperature information and progress completion information are displayed in the display control module 15, and can also be transmitted to the remote terminal or the distributed control system. The solution in the boric acid solution water tank 16 flows a certain volume of solution through the electric three-way ball valve 13 into the waste liquid discharge connection pipe and is discharged through the waste liquid discharge quick connector 10 under the action of the boric acid solution metering pump 14. A certain volume of demineralized water in the dilution liquid bottle 9 is added to the boric acid solution water tank 16 under the action of the dilution liquid metering pump 7, thereby completing the dilution of the boric acid solution. The dilution completion information is displayed in the display control module 15. At the same time, the system is ready for the next set of calibration processes. After the next set of calibration is completed, a certain volume of solution is again flowed through the electric three-way ball valve 13 into the waste liquid discharge connection pipe and discharged through the waste liquid discharge quick connector 10. A certain volume of demineralized water in the dilution liquid bottle 9 is added to the boric acid solution water tank 16 under the action of the dilution liquid metering pump 7. In this way, the solution in the boric acid solution water tank 16 is slowly diluted until all calibrations are completed.

[0020] Although the present invention has been described using the above preferred embodiments, it is not intended to limit the protection scope of the present invention. Any person skilled in the art can make various changes and modifications to the above embodiments without departing from the spirit and scope of the present invention, and still fall within the protection scope of the present invention.

[0021] The protection scope of the present invention shall be defined by the claims.

Claims

1. An intelligent calibration device applied to the boron concentration monitoring channel of a nuclear power plant, characterized in that: It includes a housing, on the outer side surface of which there is a display control module. Inside the housing, there is a boric acid solution water tank. At the top of the boric acid solution water tank, there are a liquid filling opening, a stirring device and a temperature detection device. Inside the boric acid solution water tank, there is an electric heating wire. On the outside of the boric acid solution water tank, there are a boric acid solution inlet connecting pipe, a diluent bottle, a sampling pipe and a boric acid solution outlet connecting pipe. The diluent bottle is connected to the boric acid solution water tank through a diluent pipe, and on the diluent pipe, there is a diluent metering pump. On the boric acid solution outlet connecting pipe, there are a boric acid solution metering pump and an electric three-way ball valve. On the electric three-way ball valve, there is a waste liquid discharge connecting pipe. The display control module is used to adjust the state of the electric three-way ball valve. According to the information in the display control module, a fixed volume of boric acid solution in the boric acid solution water tank is pumped by the boric acid solution metering pump to provide power for the boric acid solution to pass through the boric acid meter from the boric acid solution outlet quick connector and be discharged from the waste liquid discharge quick connector.

2. The intelligent calibration device applied to the boron concentration monitoring channel of a nuclear power plant according to claim 1, wherein: On the top of the boric acid solution water tank, there is also a magnetic flip liquid level indicator.

3. The intelligent calibration device applied to the boron concentration monitoring channel of a nuclear power plant according to claim 1, characterized in that: On the outside of the housing, there is a bracket for supporting the diluent bottle.

4. The intelligent calibration device applied to the boron concentration monitoring channel of a nuclear power plant according to claim 1, characterized in that: At the end of the sampling pipe, there is a sampling valve.

5. The intelligent calibration device applied to the boron concentration monitoring channel of a nuclear power plant according to claim 1, characterized in that: At the ends of the boric acid solution inlet connecting pipe, the boric acid solution outlet connecting pipe and the waste liquid discharge connecting pipe, there are respectively a boric acid solution inlet quick connector, a boric acid solution outlet quick connector and a waste liquid discharge quick connector.

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