Intelligent parameter calibration device for boron concentration monitoring system of nuclear power station

Abstract

The invention belongs to the field of nuclear equipment, and particularly relates to an intelligent parameter calibration device for a nuclear power station boron concentration monitoring system, which comprises a liquid preparation unit and a measurement and control unit, the liquid preparation unit comprises a liquid preparation water tank, a detection device, a liquid adding unit and a liquid taking unit; the measurement and control unit comprises a PLC (Programmable Logic Controller) and a touch control all-in-one machine; a detection inlet and a detection outlet of the liquid preparation water tank are respectively connected with the detection device to form a detection circulation loop, a liquid adding port of the liquid preparation water tank is connected with the liquid adding unit, and a liquid outlet of the liquid preparation water tank is connected with the liquid taking unit; a stirrer and a liquid level meter are mounted in the liquid preparation water tank; the touch control all-in-one machine is in communication connection with the PLC and is used for setting parameters, analyzing and calculating data, obtaining liquid preparation data and sending the liquid preparation data to the PLC; and the PLC is in communication connection with the liquid adding unit, the liquid taking unit, the stirrer and the liquid level meter and is used for completing liquid preparation, stirring, sampling and liquid discharging. The device disclosed by the invention can greatly improve the liquid preparation accuracy and the liquid preparation efficiency and reduce the pollution to the outside in the liquid preparation process.

Description

Technical Field

[0001] The invention belongs to the field of nuclear equipment, and in particular relates to an intelligent parameter calibration device for a boron concentration monitoring system of a nuclear power plant. Background Art

[0002] At present, pressurized water reactor nuclear power plants add boron to the primary coolant to achieve compensatory control of excess reactivity in the core, flatten the core power distribution, and increase the burnup depth. In addition, during shutdown, refueling or overhaul, boron is also added to keep the active area in a subcritical state for a long time. Therefore, it is necessary to monitor the boron concentration in the primary coolant in real time to ensure the safety of the nuclear power plant reactor.

[0003] The boron concentration monitoring system of nuclear power plants is a device specifically designed for real-time monitoring of the boron concentration in the coolant of the first loop of nuclear power plant reactors. It uses the high absorption cross section of 10B for thermal neutrons. The thermal neutrons generated by the neutron source are partially absorbed by the boron solution, and the remaining part is detected by the neutron detector. The boron concentration is calculated based on the mathematical model between the boron concentration and the detected neutron count rate, thereby monitoring the boron concentration in real time.

[0004] After the boron concentration monitoring system is manufactured, it needs to be calibrated using a parameter calibration device. In addition, with the long-term operation of the nuclear power plant, the boron concentration monitoring system will have deviations in measurement results due to changes in the operating conditions of the primary circuit itself and system operating parameters. Therefore, the boron concentration monitoring system generally needs to be calibrated regularly during nuclear power plant overhauls.

[0005] During the calibration test, the parameter calibration device is connected to the detection device to form a calibration loop. Under constant temperature, different concentrations of boron solutions are manually configured in the calibration loop. By measuring the neutron count rate at different boron concentrations, the relationship between boron concentration and count rate is established to obtain the measurement parameters.

[0006] Although the current parameter calibration device can meet the current boron concentration monitoring system production needs and nuclear power plant use needs, it still has the following shortcomings:

[0007] 1. Large deviation in liquid preparation. When preparing the solution, the operator takes out a certain amount of boron solution through a measuring cylinder and adds the same amount of deionized water or concentrated boron solution. Due to dripping and splashing when taking and adding liquid, inaccurate reading of the measuring cylinder and inaccurate amount of liquid added, the concentration of the prepared boron solution often deviates greatly from the target concentration.

[0008] 2. Low liquid preparation efficiency. It takes a long time to manually take and add liquid. The entire operation process from one concentration to another takes an average of 4 minutes. The solution can only be fully uniform after continuous stirring with a glass rod for 30 minutes. For a boron concentration monitoring system with 16 calibration points, it takes about 540 minutes to prepare the solution.

[0009] 3. It is easy to cause pollution. When the existing device takes liquid through the beaker, the boron solution is easy to drip onto the device and the ground; when adding liquid, by pouring the liquid into the device, the boron solution is easy to splash onto the operator; when the test is completed, the solution needs to be completely discharged, and there is currently no recovery device. Because the boron solution is corrosive, toxic and radioactive, it is polluting to the device, personnel and environment when taking liquid, adding liquid and discharging liquid.

[0010] 4. Low degree of automation. The whole device only uses PID to automatically control the temperature in the loop. During the calibration process, liquid preparation, pump start, pump stop and valve switch all need manual operation, which increases the workload of operators. Summary of the invention

[0011] The purpose of the present invention is to provide an intelligent parameter calibration device for a boron concentration monitoring system in a nuclear power plant. The device adopts a closed loop interface, has good data management and human-computer interaction functions, can analyze and calculate the displacement volume according to the current concentration and the target concentration, and automatically complete a series of processes such as liquid discharge, liquid addition, stirring, temperature control and sampling. It can greatly improve the accuracy and efficiency of liquid preparation, reduce the pollution of the liquid preparation process to the outside world, and is suitable for the automation and intelligence of the calibration of the boron concentration monitoring system.

[0012] The technical solution to achieve the purpose of the present invention is:

[0013] The invention discloses an intelligent parameter calibration device for a boron concentration monitoring system in a nuclear power plant, the device comprising: a liquid dispensing unit and a measurement and control unit; the liquid dispensing unit comprises: a liquid dispensing water tank, a detection device, a liquid adding unit and a liquid taking unit, the measurement and control unit comprises: a PLC and a touch-control integrated machine; a detection inlet and a detection outlet of the liquid dispensing water tank are respectively connected with the detection device to form a detection circulation loop, a liquid adding port of the liquid dispensing water tank is connected with the liquid adding unit, and a liquid outlet of the liquid dispensing water tank is connected with the liquid taking unit; a mixer and a liquid level meter are installed in the liquid dispensing water tank; the touch-control integrated machine is connected with the PLC for communication, the touch-control integrated machine is used for parameter setting, data analysis and calculation, obtaining liquid dispensing data, and sending the liquid dispensing data to the PLC; the PLC is connected with the liquid adding unit, the liquid taking unit, the mixer and the liquid level meter for communication, and is used for completing liquid dispensing, stirring, sampling and liquid discharge.

[0014] The liquid adding unit comprises: a deionized water storage tank, a deionized water liquid adding isolation valve, a liquid adding pump, a concentrated boron solution storage tank, and a concentrated boron solution liquid adding isolation valve; the detection circulation loop comprises: a circulation pump and a detection device; the liquid taking unit comprises a sampling cup and a waste liquid storage tank; the deionized water storage tank is connected to the liquid adding pump via the deionized water liquid adding isolation valve, the concentrated boron solution storage tank is connected to the liquid adding pump via the concentrated boron solution liquid adding isolation valve, the liquid adding pump is connected to the liquid adding port of the liquid preparation water tank; the detection inlet at the bottom of the liquid preparation water tank is connected to the detection port via the circulation pump. The detection device flow inlet is connected, and the detection device flow outlet is connected to the detection outlet on the top of the liquid preparation water tank to form a detection circulation loop; the liquid intake port of the liquid preparation water tank is connected to the sampling cup or the waste liquid storage tank; the PLC is connected to the deionized water liquid addition isolation valve, the concentrated boron solution liquid addition isolation valve, the liquid addition pump, the circulation pump, the mixer, and the liquid level meter for communication, and is used to control the on and off of the deionized water liquid addition isolation valve and the concentrated boron solution liquid addition isolation valve, control the switch of the liquid addition pump and the circulation pump, control the switch of the mixer, and measure the liquid level of the liquid preparation water tank.

[0015] The liquid dispensing unit also includes: a heater, a temperature sensor, and the measurement and control unit also includes: a temperature control meter; a heater is installed in the liquid dispensing water tank, and a temperature sensor is installed on the outer wall of the liquid dispensing water tank; the temperature sensor is connected to the temperature control meter, and the temperature sensor converts the temperature signal into a current signal, and transmits the current signal to the temperature control meter; the PLC is connected to the temperature control meter, and the temperature control meter is connected to the heater, and the PLC gives a temperature value, and transmits the temperature value to the temperature control meter; the temperature control meter controls the heater to heat the liquid in the liquid dispensing water tank to the temperature value given by the PLC according to the current signal of the temperature sensor, and feeds back the data to the PLC digital signal output module.

[0016] The liquid dispensing unit also includes: a liquid adding flow meter and a circulation flow meter. The liquid adding pump is connected to the liquid adding port of the liquid dispensing water tank via the liquid adding flow meter; the detection inlet at the bottom of the liquid dispensing water tank is connected to the flow inlet of the detection device via the circulation pump and the circulation flow meter; the PLC is connected to the liquid adding flow meter and the circulation flow meter to measure the accumulated flow of the liquid adding unit and detect the real-time flow of the circulation loop.

[0017] The liquid preparation unit also includes: a liquid adding regulating valve, a liquid discharge, a sampling valve, and a circulation regulating valve. The liquid adding pump is connected to the liquid adding port of the liquid preparation water tank through the liquid adding regulating valve and the liquid adding flow meter; the liquid taking port of the liquid preparation water tank is connected to the sampling cup or the waste liquid storage tank through the liquid discharge and sampling valves; the detection inlet at the bottom of the liquid preparation water tank is connected to the flow inlet of the detection device through the circulation pump, the circulation flow meter, and the circulation regulating valve; the PLC is connected to the liquid adding regulating valve, the liquid discharge, the sampling valve, and the circulation regulating valve, and is used to control the opening of the liquid adding regulating valve, the liquid discharge, the sampling valve, and the circulation regulating valve.

[0018] The PLC includes a main controller, an analog input module, an analog output module, and a digital signal output module. The main controller includes an Ethernet interface and an RS485 interface; the PLC is connected to the touch-screen integrated machine through the Ethernet interface, and the PLC is connected to the temperature control meter through the RS485 interface; the PLC analog input module is connected to the liquid level meter, the liquid adding flow meter, and the circulation flow meter; the PLC analog output module is connected to the liquid adding regulating valve, the drain, the sampling valve, and the circulation regulating valve; the PLC digital signal output module is connected to the deionized water liquid adding isolation valve, the concentrated boron solution liquid adding isolation valve, the mixer, the liquid adding pump, and the circulation pump.

[0019] The touch-control integrated machine includes: a parameter setting module and a data analysis and calculation module; the parameter setting module is used to set the number of calibration concentration points, the target concentration of each concentration point, the concentration of the concentrated boron solution, the verification concentration point, the calibration temperature and the stirring time parameters; the data analysis and calculation module is used to analyze and calculate the parameter data set by the parameter setting module, obtain the liquid preparation data, and send the liquid preparation data to the PLC.

[0020] The touch-controlled all-in-one machine also includes: a user management module and a self-check module; the user management module is used to grant different operating permissions to different users, which are divided into operator permissions and administrator permissions; operator permissions include device operation and data browsing, and administrator permissions include device operation, data browsing, parameter setting, user and password maintenance; the self-check module is used to perform self-checks on the communication connection status, liquid level status, and device status of the device, and any problems will be displayed and prompted.

[0021] The touch-controlled machine also includes: a monitoring module, which includes: a temperature monitoring module, a liquid preparation monitoring module, and a liquid level and flow monitoring module; the temperature monitoring module is used to display the solution temperature in the touch-controlled machine display interface, set the temperature value, and alarm for overtemperature; the liquid preparation monitoring module is used to dynamically display the operating status of the electric pump and the agitator in the touch-controlled machine display interface, and supports manual or automatic start and stop control, and the liquid preparation process flow has prompts and confirmations; the liquid level and flow monitoring module is used to dynamically display the liquid level height, the cumulative flow of the liquid adding unit, and the real-time flow of the detection circulation loop in the touch-controlled machine display interface.

[0022] The touch-control integrated machine also includes: a data management module; the data management module is used to record, store and query setting parameter data, analysis and processing data, and measurement result data.

[0023] The beneficial technical effects of the present invention are:

[0024] 1. Automated process control: The liquid preparation, stirring, temperature control, sampling and other processes of the intelligent parameter calibration device for the boron concentration monitoring system of a nuclear power plant provided by the present invention are all controlled by PLC. The liquid preparation process includes two processes: drainage and liquid addition. After the PLC receives the liquid preparation related data sent by the human-computer interaction terminal, it connects to the waste liquid tank, controls the drainage / sampling valve to open, starts the drainage process, reads the liquid level information through the liquid level meter, and stops draining when the liquid level reaches the target height; the PLC controls the switch valve to open and the liquid addition pump to start the liquid addition (water or boron solution) process, reads the liquid level information through the liquid level meter, and stops adding liquid when the liquid level reaches the target height. After the liquid preparation is completed, the PLC controls the mixer to start stirring, and sends the temperature value to the temperature control meter through RS485. The temperature control meter controls the heater to achieve temperature control, and stops stirring when the preset waiting time is reached. Connect the sampling cup, the PLC controls the drainage / sampling valve to open, monitors the liquid level information, and controls the sampling volume through the liquid level.

[0025] 2. Accurate liquid distribution control: The liquid distribution process is divided into displacement volume calculation, liquid discharge and liquid addition process. The software calculates the displacement volume according to the target concentration and current concentration analysis to reduce calculation errors caused by human factors. The liquid distribution tank adopts a rectangular design. The liquid level height is measured by a high-precision radar level gauge with an error control of ±1mm. The liquid level (volume) data is fed back in real time to form a closed-loop control, accurately measuring the volume of liquid addition and discharge, so that the liquid distribution can be accurately controlled.

[0026] 3. Good human-computer interaction: The intelligent parameter calibration device of the boron concentration monitoring system of a nuclear power plant provided by the present invention is equipped with a touch-screen all-in-one machine as a human-computer interaction terminal, which cancels the original mechanical switch control. After completing the parameter setting, the whole process can be completed with one click. The human-computer interaction terminal mainly completes the parameter configuration, analysis and calculation, and data management functions. Through the software interface on the touch-screen all-in-one machine, you can select the solute method or the dilution method, enter the number of concentration points, the target concentration of the concentration point, and the current concentration. The software automatically calculates the displacement volume according to the selected method and concentration information, and communicates with the PLC via Ethernet to operate the intelligent parameter calibration device of the boron concentration monitoring system, transmit control parameters and feedback device status, so as to realize the human-computer interaction function. The software on the touch-screen all-in-one machine can realize data management, establish a database, and save historical data such as calibration time, concentration, displacement volume, etc. for query. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of a liquid preparation unit in an intelligent parameter calibration device for a nuclear power plant boron concentration monitoring system provided by the present invention;

[0028] Figure 2 This is a communication connection diagram of the measurement and control unit in the intelligent parameter calibration device of the nuclear power plant boron concentration monitoring system provided by the present invention.

[0029] In the figure: 1-deionized water storage tank; 2-deionized water adding isolation valve; 3-adding pump; 4-concentrated boron solution storage tank; 5-concentrated boron solution adding isolation valve; 6-adding regulating valve; 7-adding flow meter; 8-waste liquid storage tank; 9-drainage and sampling valve; 10-heater; 11-mixer; 12-liquid level meter; 13-calibration water tank; 14-temperature sensor; 15-circulation pump; 16-circulation flow meter; 17-circulation regulating valve; 18-detection device. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

[0031] The present invention provides an intelligent parameter calibration device for a nuclear power plant boron concentration monitoring system, which can automatically analyze the need to add concentrated boron solution or deionized water according to the concentration of the solution in the water tank of the current device, calculate the volume of liquid to be added and discharged, and automatically complete a series of processes such as draining, adding liquid, stirring, temperature control and sampling, and can recycle the waste liquid discharged after the test is completed.

[0032] Specifically, the present invention provides an intelligent parameter calibration device for a nuclear power plant boron concentration monitoring system, comprising: a liquid preparation unit and a measurement and control unit.

[0033] like Figure 1 As shown, the liquid preparation unit includes: a liquid preparation water tank 13, a detection device 18, a liquid adding unit, and a liquid taking unit. The detection inlet and the detection outlet of the liquid preparation water tank 13 are respectively connected to the detection device 18 to form a detection circulation loop, the liquid adding port of the liquid preparation water tank 13 is connected to the liquid adding unit, and the liquid outlet of the liquid preparation water tank 13 is connected to the liquid taking unit.

[0034] The detection circulation loop includes: a circulation pump 15, a circulation flow meter 16, a circulation regulating valve 17, and a detection device 18; the detection inlet at the bottom of the liquid preparation water tank 13 is connected to the inlet of the detection device 18 through the circulation pump 15, the circulation flow meter 16, the circulation regulating valve 17, and the outflow of the detection device 18 is connected to the detection outlet at the top of the liquid preparation water tank 13, forming a detection circulation loop.

[0035] The liquid adding unit comprises: a deionized water storage tank 1, a deionized water liquid adding isolation valve 2, a liquid adding pump 3, a concentrated boron solution storage tank 4, a concentrated boron solution liquid adding isolation valve 5, a liquid adding regulating valve 6, and a liquid adding flow meter 7; the deionized water storage tank 1 is connected to the liquid adding pump 3 via the deionized water liquid adding isolation valve 2, the concentrated boron solution storage tank 4 is connected to the liquid adding pump 3 via the concentrated boron solution liquid adding isolation valve 5, and the liquid adding pump 3 is connected to the liquid adding port of the liquid distribution water tank 13 via the liquid adding regulating valve 6 and the liquid adding flow meter 7.

[0036] The liquid taking unit includes: a sampling cup, a waste liquid storage tank 8, a drain and a sampling valve 9. The drain and sampling valve 9 are connected to the liquid taking port of the liquid preparation tank 13. When draining or sampling, the sampling cup or the waste liquid storage tank 8 is connected downstream of the drain and sampling valve 9 respectively, and the flow rate of sampling or draining is controlled by the drain and sampling valve 9.

[0037] A heater 10 , a stirrer 11 , and a liquid level meter 12 are installed in the liquid distribution water tank 13 , and a temperature sensor 14 is installed on the outer wall of the liquid distribution water tank 13 .

[0038] The measurement and control unit includes: PLC (Programmable Logic Controller), temperature control meter, and touch-control integrated machine. The PLC and temperature control meter are installed in the measurement and control box of the device, and the touch-control integrated machine is installed above the surface of the device. The communication connection diagram of the measurement and control unit is as follows: Figure 2 shown.

[0039] The PLC includes a main controller, an analog input module, an analog output module, and a digital signal output module. The main controller includes an Ethernet interface and an RS485 interface.

[0040] The PLC analog input module is in communication connection with the liquid level meter 12, the liquid adding flow meter 7 and the circulation flow meter 16, and is used to measure the liquid level of the liquid distribution tank 13, measure the accumulated flow of the liquid adding unit and detect the real-time flow of the circulation loop.

[0041] The PLC digital signal output module is communicatively connected with the deionized water addition isolation valve 2 and the concentrated boron solution addition isolation valve 5, and is used for controlling the on and off of the deionized water addition isolation valve 2 and the concentrated boron solution addition isolation valve 5.

[0042] The PLC digital signal output module is in communication connection with the mixer 11 and is used to control the switch of the mixer 11 .

[0043] The PLC digital signal output module is in communication connection with the liquid adding pump 3 and the circulation pump 15 , and is used to control the switching of the liquid adding pump 3 and the circulation pump 15 .

[0044] The PLC analog output module is communicatively connected with the liquid adding regulating valve 6 , the liquid discharging valve, the sampling valve 9 , and the circulation regulating valve 17 , and is used to control the opening of the liquid adding regulating valve 6 , the liquid discharging valve, the sampling valve 9 , and the circulation regulating valve 17 .

[0045] A temperature sensor 14 is installed on the outer wall of the liquid distribution water tank 13. The temperature sensor 14 is connected to a temperature control meter. The temperature sensor 14 converts a temperature signal into a current signal and transmits the current signal to the temperature control meter.

[0046] The PLC is connected to the temperature control meter through the RS485 interface of the main controller, and the temperature control meter is connected to the heater 10. The PLC main controller module gives a temperature value and transmits the temperature value to the temperature control meter; the temperature control meter controls the heater 10 to heat the liquid in the liquid distribution tank 13 to the temperature value given by the PLC main controller according to the current signal of the temperature sensor 14, and feeds back the data to the PLC main controller.

[0047] The touch-screen all-in-one machine is connected to the PLC through the Ethernet interface of the main controller. The touch-screen all-in-one machine is used to set parameters, perform data analysis and calculations, obtain liquid preparation data, and send the liquid preparation data to the PLC main controller. The PLC intelligently controls the parameter calibration device to complete a series of processes such as liquid preparation, stirring, temperature control, sampling, and discharge.

[0048] The touch-screen integrated machine includes a parameter setting module, a data analysis and calculation module, a user management module, a self-test module, a monitoring module, and a data management module; the monitoring module includes: a temperature monitoring module, a liquid distribution monitoring module, and a liquid level and flow monitoring module.

[0049] The parameter setting module is used to set parameters such as the number of calibration concentration points, the target concentration of each concentration point, the concentration of the concentrated boron solution, the verification concentration point, the calibration temperature and the stirring time.

[0050] The data analysis and calculation module is used to analyze and calculate the parameter data set by the parameter setting module, obtain the liquid preparation data, and send the liquid preparation data to the PLC.

[0051] The user management module is used to grant different operation permissions to different users, which are divided into operator permissions and administrator permissions. Operator permissions include device operation and data browsing, and administrator permissions include device operation, data browsing, parameter setting, user and password maintenance. The operator or administrator must enter the correct user name and operation password to log in before entering the touch all-in-one computer system.

[0052] The self-check module is used to perform self-checks on the device's communication connection status, liquid level status, and equipment status. Any problems will be displayed and prompted.

[0053] The temperature monitoring module is used to display the solution temperature in the touch screen display interface, set the temperature value, and alarm when the temperature exceeds the limit.

[0054] The liquid preparation monitoring module is used to dynamically display the operating status of the electric pump and agitator in the touch screen display interface, and supports manual or automatic start and stop control. The liquid preparation process flow has prompts and confirmations.

[0055] The liquid level and flow monitoring module is used to dynamically display the liquid level height, the cumulative flow of the liquid adding unit, and the real-time flow of the detection circulation loop in the touch screen display interface.

[0056] The data management module is used to record, store and query the setting parameter data, analysis and processing data, and measurement result data. At the same time, the setting parameter data, analysis and processing data, and measurement result data can be saved and exported through the data management module.

[0057] In a specific embodiment, the main body of the calibration device of the present invention adopts a trolley-type mobile frame structure, equipped with a liquid preparation water tank 13 and a measurement and control box. The calibration device has a size of 590 mm in length, 500 mm in width, and 700 mm in height. The box structure is supported by four wheels. The device can be pushed by the wheels. A locking device is installed on each wheel, which can lock the wheel when stationary to prevent sliding. The size of the liquid preparation water tank 13 is: 400 mm in length, 300 mm in width, and 300 mm in height, and the outside is covered with heat insulation material.

[0058] In another specific embodiment, the liquid adding pump 3 and the circulation pump 15 are both Iwaki MD series magnetic pumps, which are leak-free magnetic pumps with no seal wear and replacement problems, compact structure, easy installation, few parts, simple and convenient disassembly and inspection. It is powered by 220VAC / 50Hz, with a power of 260W, a flow rate of 120L / min, and a head of 8.6m.

[0059] In another specific embodiment, the liquid adding regulating valve 6, the liquid discharging and sampling valve 9, and the circulation regulating valve 17 are all made of DFCV35-03+PVX-02, the valve body and the shell are all made of stainless steel, the control part is powered by 24VDC, and the linear opening is controlled by 0-20mA current, and the repeat positioning accuracy can reach 0.5% FS. The liquid adding regulating valve 6 in the liquid adding pipeline and the circulation regulating valve 17 in the circulation loop are used in conjunction with the magnetic pump for flow control, and the liquid discharging and sampling valve 9 are used for different flow rate control in the two working conditions of liquid discharging and sampling.

[0060] In another specific embodiment, the deionized water addition isolation valve 2 and the concentrated boron solution addition isolation valve 5 are both solenoid valves, both adopt 2W040-10B, the valve body is made of stainless steel, the working voltage is 220VAC / 50Hz, and the PLC digital signal controls the relay to realize the switching valve voltage on and off, thereby realizing the switching function.

[0061] In another specific embodiment, the liquid adding flow meter 7 and the circulation flow meter 16 are both LWGY-C-15 flow meters, which output 4-20mA current signals to the PLC analog input module for collection, and are used to measure the cumulative flow of the liquid adding pipeline and the real-time flow of the circulation loop.

[0062] In another specific embodiment, the liquid level meter 12 is a radar level meter using MG8926S176-81GHz, with a measurement range of 30m and an accuracy of ±1mm. By measuring the liquid level of the liquid distribution tank 13, the volume of the boron solution in the inner loop of the liquid distribution tank 13 can be calculated.

[0063] In another specific embodiment, the mixer 11 adopts JB500-D, 220VAC / 50Hz power supply, maximum speed 0-1000r / min, maximum stirring volume 50L, and switch control is achieved through PLC digital signal control relay.

[0064] In another specific embodiment, the temperature sensor 14 is a SIN-WZPK 331A temperature sensor, which converts the temperature signal into a 4-20mA signal to the temperature controller. The temperature controller is E5CC-RX2DSM-802, which supports 2-DOF PID (with automatic tuning) to control the temperature deviation within ±1°C. The heater 10 uses a stainless steel single U1KW / 2KW, one each, powered by 220VAC / 50Hz, and the operation of the heater 10 is controlled by the temperature controller.

[0065] PLC is the core control component of the entire device. In a specific implementation, Siemens S7-200Smart is used, which consists of a main controller EM ST30, a 4-channel analog input module EM AE04, a 4-channel analog output module EM AQ04, and an 8-channel digital signal output module EM AQ04.

[0066] The main controller EM ST30 has a basic instruction execution time of up to 0.15μs, including an Ethernet interface for communicating with the touch-screen integrated machine, an RS485 interface for communicating with the temperature control meter, 18-point digital input and 12-point digital output on board, and with the 8-channel digital signal output module EM AQ04, it can achieve 20-channel digital output to meet the switch quantity control of two magnetic pumps, a heater, a mixer and two switch valves in the loop. With the 4-channel analog input module EM AE04, the measurement results of the radar level meter and turbine flowmeter in the loop are collected. With the 4-channel analog output module EM AQ04, the opening of the three regulating valves in the loop is controlled.

[0067] The touch-screen all-in-one machine is used as a human-machine interaction terminal. In a specific implementation, an Advantech PPC-3120S industrial touch-screen tablet computer is used, which is embedded and installed above the entire device. It communicates with the PLC via Ethernet, and a host computer software is developed on the human-machine interaction terminal. The software is used to operate the device, transmit control parameters, and feedback the device status to realize the human-machine interaction function.

[0068] The working principle of the intelligent parameter calibration device for the boron concentration monitoring system of a nuclear power plant provided by the present invention is as follows:

[0069] The user inputs the number of concentration points and the target value of each concentration point on the human-computer interaction terminal (touch-screen integrated machine).

[0070] First, calculate the volume of concentrated boron solution and deionized water to be added according to the highest concentration of the prepared solution, add deionized water and concentrated boron solution to the water tank of the device through the liquid adding pipeline, stir and control the temperature at 30°C, wait for 20 to 30 minutes, and discharge a certain amount of liquid from the sampling port to complete the sampling. After waiting for the titration personnel to complete the titration and enter the titration results, automatically calculate the volume to be replaced, control the discharge port to discharge the calculated volume of solution to the waste liquid tank, and then add the same volume of deionized water through the liquid adding pipeline, stir and control the temperature at 30°C, wait for 20 to 30 minutes, and discharge a certain amount of liquid from the sampling port to complete the second sampling, wait for the titration results, and repeat this process until the configuration, sampling and titration of all concentration points are completed.

[0071] The intelligent parameter calibration device for the boron concentration monitoring system of a nuclear power plant provided by the present invention is used to perform calibration work, which specifically includes the following processes: The whole device is divided into manual mode and automatic mode:

[0072] Manual mode: The pump, valve, heater and mixer can be operated individually in the loop system through the human-machine interaction terminal (touch screen all-in-one machine), which is mainly used for control function inspection and debugging of the whole device.

[0073] Automatic mode: After setting the number of calibration points and the target concentration of the corresponding points, the boron solution preparation and sampling of each point can be completed automatically. The specific steps are as follows:

[0074] Step a, parameter entry: First, connect the concentrated boron solution storage tank, deionized water storage tank and sampling cup. Enter the calibration concentration points, target concentration of each concentration point, concentrated boron solution concentration, and calibration temperature. For example, to calibrate a boron meter with a range of 3000mg / L, the calibration points are 15, the concentrated boron solution concentration is 5000mg / L, and the dilution method is used for calibration.

[0075] Step b, prepare the first point: The human-computer interaction terminal software calculates the first concentration point of 3000 mg / L, where the total volume in the loop is 25L, the required concentrated boron liquid volume is 15L, and the deionized water volume is 10L. PLC controls the concentrated boron liquid switch valve to open and start the liquid adding pump, and the concentrated boron solution flows into the liquid distribution water tank through the liquid adding pipeline. When the flow meter on the liquid adding pipeline measures that the cumulative flow reaches 15L, the PLC closes the liquid adding pump and the concentrated boron liquid switch valve, opens the deionized water switch valve and starts the liquid adding pump, and the deionized water flows into the liquid distribution water tank through the liquid adding pipeline. When the radar level gauge measures the liquid level data to meet the corresponding height of 25L, the PLC closes the liquid adding pump and the deionized water switch valve.

[0076] Step c, circulation, stirring, temperature control: PLC controls the start of the circulation pump and the stirrer to start circulation and stirring, and the temperature control meter controls the heater to control the temperature.

[0077] Step d, sampling: PLC controls to open the drain / sampling valve. When the liquid level drops to the height of the sampling volume, the drain / sampling valve is closed and the sampling completion is prompted on the human-machine interface.

[0078] Step e, prepare the second concentration point: when the operator completes the sample titration, connect the waste liquid tank, and open the discharge / sampling valve controlled by the PLC according to the calculated discharge volume. The liquid flows into the waste liquid tank from the discharge port, and the liquid level in the preparation water tank drops. When the liquid level drops to the discharge volume, the discharge / sampling valve is closed; connect the sampling cup, the PLC opens the liquid adding pump and the deionized water switch valve to add deionized water, and when the liquid level reaches the total volume, the liquid adding pump and the switch valve are closed. According to steps c to d, the circulation, stirring, temperature control and sampling process of the second point are completed. The human-computer interaction end can calculate a reference boron concentration and display it on the human-computer interface and prompt that the preparation is completed.

[0079] Step f, prepare the remaining points: refer to step e to complete the preparation of the remaining points.

[0080] Step g, draining and cleaning: After completing all calibrations, connect the waste liquid tank, control the drain / sampling valve to drain all liquid, and control the deionized water filling pipeline to add liquid to the full volume, then control the discharge of all liquid to complete the device circuit cleaning.

[0081] The present invention is described in detail above with reference to the accompanying drawings and embodiments, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of ordinary technicians in the field without departing from the purpose of the present invention. The contents not described in detail in the present invention can adopt the existing technology.

Claims

1. An intelligent parameter calibration device for a nuclear power plant boron concentration monitoring system, characterized in that: The device comprises: a liquid dispensing unit and a measurement and control unit; the liquid dispensing unit comprises: a liquid dispensing water tank (13), a detection device (18), a liquid adding unit, and a liquid taking unit; the measurement and control unit comprises: a PLC and a touch-control integrated machine; the detection inlet and the detection outlet of the liquid dispensing water tank (13) are respectively connected to the detection device (18) to form a detection circulation loop; the liquid adding port of the liquid dispensing water tank (13) is connected to the liquid adding unit; the liquid outlet of the liquid dispensing water tank (13) is connected to the liquid taking unit; a mixer (11) and a liquid level meter (12) are installed in the liquid dispensing water tank (13); the touch-control integrated machine is connected to the PLC for communication, and the touch-control integrated machine is used for parameter setting, data analysis and calculation, obtaining liquid dispensing data, and sending the liquid dispensing data to the PLC; the PLC is connected to the liquid adding unit, the liquid taking unit, the mixer (11), and the liquid level meter (12) for communication, and is used for completing liquid dispensing, stirring, sampling, and liquid discharge.

2. According to claim 1, a nuclear power plant boron concentration monitoring system intelligent parameter calibration device is characterized in that: The liquid adding unit comprises: a deionized water storage tank (1), a deionized water liquid adding isolation valve (2), a liquid adding pump (3), a concentrated boron solution storage tank (4), and a concentrated boron solution liquid adding isolation valve (5); the detection circulation loop comprises: a circulation pump (15) and a detection device (18); the liquid taking unit comprises a sampling cup and a waste liquid storage tank (8); the deionized water storage tank (1) is connected to the liquid adding pump (3) via the deionized water liquid adding isolation valve (2); the concentrated boron solution storage tank (4) is connected to the liquid adding pump (3) via the concentrated boron solution liquid adding isolation valve (5); the liquid adding pump (3) is connected to the liquid adding port of the liquid preparation water tank (13); the detection inlet at the bottom of the liquid preparation water tank (13) is connected to the detection inlet via the circulation pump (15) The detection device (18) is connected to the inlet of the detection device (18), and the outlet of the detection device (18) is connected to the detection outlet at the top of the liquid preparation water tank (13), so as to form a detection circulation loop; the liquid taking port of the liquid preparation water tank (13) is connected to the sampling cup or the waste liquid storage tank (8); the PLC is connected to the deionized water liquid addition isolation valve (2), the concentrated boron solution liquid addition isolation valve (5), the liquid addition pump (3), the circulation pump (15), the stirrer (11), and the liquid level meter (12) for communication, and is used to control the on and off of the deionized water liquid addition isolation valve (2) and the concentrated boron solution liquid addition isolation valve (5), control the switching of the liquid addition pump (3) and the circulation pump (15), control the switching of the stirrer (11), and measure the liquid level of the liquid preparation water tank (13).

3. The intelligent parameter calibration device for a nuclear power plant boron concentration monitoring system according to claim 1, characterized in that: The liquid dispensing unit further comprises: a heater (10) and a temperature sensor (14); the measurement and control unit further comprises: a temperature control meter; a heater (10) is installed in the liquid dispensing water tank (13); a temperature sensor (14) is installed on the outer wall of the liquid dispensing water tank (13); the temperature sensor (14) is connected to the temperature control meter, the temperature sensor (14) converts a temperature signal into a current signal, and transmits the current signal to the temperature control meter; a PLC is connected to the temperature control meter, the temperature control meter is connected to the heater (10), the PLC gives a temperature value, and transmits the temperature value to the temperature control meter; the temperature control meter controls the heater (10) to work according to the current signal of the temperature sensor (14), heats the liquid in the liquid dispensing water tank (13) to the temperature value given by the PLC, and feeds back data to the PLC digital signal output module.

4. The intelligent parameter calibration device for a nuclear power plant boron concentration monitoring system according to claim 2, characterized in that: The liquid dispensing unit further comprises: a liquid adding flow meter (7) and a circulation flow meter (16); the liquid adding pump (3) is connected to the liquid adding port of the liquid dispensing water tank (13) via the liquid adding flow meter (7); the detection inlet at the bottom of the liquid dispensing water tank (13) is connected to the flow inlet of the detection device (18) via the circulation pump (15) and the circulation flow meter (16); and the PLC is connected to the liquid adding flow meter (7) and the circulation flow meter (16) for measuring the accumulated flow of the liquid adding unit and detecting the real-time flow of the circulation loop.

5. The intelligent parameter calibration device for the boron concentration monitoring system of a nuclear power plant according to claim 4, characterized in that: The liquid dispensing unit further comprises: a liquid adding regulating valve (6), a liquid discharging and sampling valve (9), and a circulation regulating valve (17); the liquid adding pump (3) is connected to the liquid adding port of the liquid dispensing water tank (13) via the liquid adding regulating valve (6) and the liquid adding flow meter (7); the liquid taking port of the liquid dispensing water tank (13) is connected to the sampling cup or the waste liquid storage tank (8) via the liquid discharging and sampling valve (9); the detection inlet at the bottom of the liquid dispensing water tank (13) is connected to the flow inlet of the detection device (18) via the circulation pump (15), the circulation flow meter (16), and the circulation regulating valve (17); and the PLC is connected to the liquid adding regulating valve (6), the liquid discharging and sampling valve (9), and the circulation regulating valve (17) and is used to control the opening of the liquid adding regulating valve (6), the liquid discharging and sampling valve (9), and the circulation regulating valve (17).

6. The intelligent parameter calibration device for the boron concentration monitoring system of a nuclear power plant according to claim 5, characterized in that: The PLC comprises a main controller, an analog input module, an analog output module, and a digital signal output module. The main controller comprises an Ethernet interface and an RS485 interface. The PLC is connected to the touch-control integrated machine through the Ethernet interface, and is connected to the temperature control meter through the RS485 interface. The PLC analog input module is connected to a liquid level meter (12), a liquid addition flow meter (7), and a circulation flow meter (16). The PLC analog output module is connected to a liquid addition regulating valve (6), a liquid discharge and sampling valve (9), and a circulation regulating valve (17). The PLC digital signal output module is connected to a deionized water liquid addition isolation valve (2), a concentrated boron solution liquid addition isolation valve (5), a stirrer (11), a liquid addition pump (3), and a circulation pump (15).

7. The intelligent parameter calibration device for a nuclear power plant boron concentration monitoring system according to claim 1, characterized in that: The touch-control integrated machine includes: a parameter setting module and a data analysis and calculation module; the parameter setting module is used to set the number of calibration concentration points, the target concentration of each concentration point, the concentration of the concentrated boron solution, the verification concentration point, the calibration temperature and the stirring time parameters; the data analysis and calculation module is used to analyze and calculate the parameter data set by the parameter setting module, obtain the liquid preparation data, and send the liquid preparation data to the PLC.

8. The intelligent parameter calibration device for the boron concentration monitoring system of a nuclear power plant according to claim 7, characterized in that: The touch-controlled all-in-one machine also includes: a user management module and a self-check module; the user management module is used to grant different operating permissions to different users, which are divided into operator permissions and administrator permissions; operator permissions include device operation and data browsing, and administrator permissions include device operation, data browsing, parameter setting, user and password maintenance; the self-check module is used to perform self-checks on the communication connection status, liquid level status, and device status of the device, and any problems will be displayed and prompted.

9. The intelligent parameter calibration device for the boron concentration monitoring system of a nuclear power plant according to claim 7, characterized in that: The touch-controlled machine also includes: a monitoring module, which includes: a temperature monitoring module, a liquid preparation monitoring module, and a liquid level and flow monitoring module; the temperature monitoring module is used to display the solution temperature in the touch-controlled machine display interface, set the temperature value, and alarm for overtemperature; the liquid preparation monitoring module is used to dynamically display the operating status of the electric pump and the agitator in the touch-controlled machine display interface, and supports manual or automatic start and stop control, and the liquid preparation process flow has prompts and confirmations; the liquid level and flow monitoring module is used to dynamically display the liquid level height, the cumulative flow of the liquid adding unit, and the real-time flow of the detection circulation loop in the touch-controlled machine display interface.

10. The intelligent parameter calibration device for the boron concentration monitoring system of a nuclear power plant according to claim 7, characterized in that: The touch-control integrated machine also includes: a data management module; the data management module is used to record, store and query setting parameter data, analysis and processing data, and measurement result data.

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