Sub-resistance liquid level meter device for lead-based reactor liquid level fluctuation measurement and test method

Abstract

The invention discloses a sub-resistance liquid level meter device for lead-based reactor liquid level fluctuation measurement and a test method. The sub-resistance liquid level meter device comprises a liquid storage tank, a test container and a sub-resistance liquid level meter body, the sub-resistance liquid level meter body is located in the test container, a measuring point is installed on the sub-resistance liquid level meter body and used for measuring the liquid level of the test container, and the liquid storage tank is filled with liquid lead-based alloy and connected with the test container through a pipeline. A liquid level fluctuation test environment of the liquid lead-based alloy is realized by building a test system and a test container capable of adjusting liquid charging and discharging; according to the liquid lead-based alloy state monitoring system and method, the liquid lead-based alloy states of different factors such as the temperature, the liquid level fluctuation amplitude and the liquid level fluctuation rate of the liquid lead-based alloy can be achieved, and the liquid level fluctuation conditions in all the states are captured, judged and displayed through the sub-resistance liquid level meter.

Description

Technical Field

[0001] This invention relates to the field of lead-based reactor technology, and specifically to a resistivity level gauge device and test method for measuring liquid level fluctuations in lead-based reactors. Background Technology

[0002] Lead-based reactors are a key direction in fourth-generation nuclear power technology, with their unique coolant safety and fuel propagation capabilities being important inherent safety advantages. Furthermore, to improve economic efficiency, the lead-based alloy coolant system in the primary loop of a lead-based reactor is generally designed as a pool type, with the steam generator, main pump, core, and internal components all immersed in a lead-based alloy pool. Because different equipment is located in different chambers within the pool, the liquid level varies in different areas of the lead-based alloy pool during steady-state operation, and fluctuates during transient operation. These phenomena indicate the necessity of installing liquid level monitoring devices in different chambers of the lead-based alloy pool.

[0003] Existing liquid level monitoring device designs include float-type, magnetostrictive, capacitive, differential pressure, ultrasonic, microwave radar, fiber optic, and mutual inductance level gauges. Among these, float-type, magnetostrictive, capacitive, and differential pressure level gauges are all contact-type, monitoring the liquid level in real time by contacting the working fluid and changing the float position, torsional wave, capacitance value, or gravitational pressure difference. However, the corrosion of lead-based alloys after prolonged immersion and the high-temperature operation of lead-based alloys make these three contact-type level gauges unsuitable for monitoring lead-based alloy levels. Ultrasonic, microwave radar, and fiber optic level gauges are all non-contact type, using the differences in propagation characteristics of ultrasonic waves, microwaves, and light sources in the lead-based alloy pool and the above air space to provide real-time feedback on the liquid level. However, the measurement accuracy of these three types of level gauges is also significantly affected in highly corrosive and high-temperature environments. In a mutual inductance level gauge, the primary instrument directly contacts the liquid, while the secondary instrument receives, judges, and outputs the signal transmission difference before and after the primary instrument contacts the liquid. This is a feasible solution for measuring the level of lead-based alloy liquids. However, existing mutual inductance level gauges do not have material and structural design optimizations for the use environment of lead-based alloy pools, and there is a lack of functional testing environments for level gauges in lead-based alloy environments. Summary of the Invention

[0004] The purpose of this invention is to provide a resistivity level gauge device and test method for measuring liquid level fluctuations in lead-based alloys. By constructing an adjustable filling and draining test system and test container, a test environment for liquid level fluctuations in liquid lead-based alloys is achieved. Through a multi-point primary instrument design using resistivity, liquid level measurements at various heights within the liquid lead-based alloy are realized. Through a secondary instrument design using resistivity, a host computer can distinguish the resistivity values ​​corresponding to different resistance values ​​of the liquid lead-based alloy, air, and oxide impurities, determining and displaying whether each liquid level measuring point is in contact with the liquid lead-based alloy, thereby determining the liquid level position and fluctuation status of the liquid lead-based alloy. The test system of this invention can realize the liquid lead-based alloy state under various factors such as temperature, liquid level fluctuation amplitude, and liquid level fluctuation rate, and uses a resistivity level gauge to capture, determine, and display the liquid level fluctuations under each state.

[0005] The technical solution of the present invention is as follows: A resistivity level gauge device for measuring liquid level fluctuation in lead-based reactors includes a storage tank, a test container, and a resistivity level gauge body; the resistivity level gauge body is located in the test container, and measuring points are installed on it to measure the liquid level in the test container, while the storage tank contains liquid lead-based alloy and is connected to the test container through a pipeline.

[0006] The outer surface of the storage tank is wrapped with an electric heat tracing device to heat the liquid lead-based alloy, and the storage tank is equipped with an armored thermocouple to monitor the temperature of the liquid lead-based alloy.

[0007] The storage tank contains a gas section and a liquid section. The liquid section contains a single-point level gauge assembly, which consists of several single-point contact on / off level gauges that are vertically inserted into the storage tank at different depths. These gauges are used to determine the changes in the liquid level within the storage tank.

[0008] A pressure transmitter is installed in the gas section of the liquid storage tank to monitor the pressure inside the tank.

[0009] The storage tank has a manhole, through which solid lead-based alloy ingots are added into the storage tank.

[0010] The liquid portion of the storage tank is connected to the test container via a lead-based alloy filling and draining pipeline. The filter, regulating valve assembly, and filter screen are all arranged on the lead-based alloy filling and draining pipeline. The liquid lead-based alloy is filled into the test container by adjusting the pressure difference between the storage tank and the test container.

[0011] The cover gas intake system pipeline is connected to the storage tank and the test container, and the connecting pipeline is equipped with a storage tank intake valve and a test container intake valve, which are used to fill the storage tank and the test container with inert gas and pressurize them, respectively; the storage tank and the test container are both connected to the cover gas exhaust system pipeline, and the connecting pipeline is equipped with a storage tank exhaust valve and a test container exhaust valve, respectively. The cover gas exhaust system pipeline is connected to the atmospheric exhaust pipeline 018; and the test container is equipped with a test container safety valve.

[0012] The test container includes a covering gas space and a liquid lead-based alloy pool; it is equipped with armored thermocouples, pressure transmitters, and controllable electric heating elements. The armored thermocouples are used to measure the temperature of the liquid lead-based alloy pool in the test container, the pressure transmitters are used to measure the pressure of the covering gas space in the test container, and the controllable electric heating elements are used to heat and maintain the temperature of the liquid lead-based alloy pool.

[0013] The test container has a lead-based alloy filling and emptying port at the bottom, which is connected to the lead-based alloy filling and emptying pipeline. Liquid lead-based alloy is filled into the test container to form a lead-based alloy pool with the required liquid level. Above the lead-based alloy pool is a covering gas space filled with inert gas.

[0014] The test container is equipped with a differential pressure transmitter, a pressure sensor, and a single-point level gauge assembly to determine the liquid level within the container. These three level measurement methods are cross-calibrated and compared with the monitoring results from the resistivity level gauge.

[0015] The resistance level gauge body is vertically inserted into the test container, which includes the main cylinder of the resistance level gauge; the front end of the main cylinder of the resistance level gauge has a telescopic tube section of the main cylinder, and several detachable buckles of the main cylinder are arranged axially at different heights of the main cylinder. The branch cylinders of the resistance level gauge are vertically connected to the main cylinder through the detachable buckles of the main cylinder. The front end of the branch cylinder of the resistance level gauge has a telescopic tube section of the branch cylinder; there are multiple measuring point structures on the wall surface of the main cylinder of the resistance level gauge and the wall surface of the branch cylinder of the resistance level gauge, forming liquid level measuring points.

[0016] The measuring point structure is a metal structure that can form a circuit when in contact with liquid lead-based alloy and an open circuit when not in contact, and transmit the on / off signal in real time via a signal transmission cable; the adhesive material is used to bond the measuring point structure and the insulation structure, wherein the insulation structure is an insulating material used to separate the measuring point structure and the body of the resistance level gauge.

[0017] All measuring points inside the test container are primary instruments. All measuring points are connected to the host computer via data transmission cables. The host computer displays the continuity status of each measuring point.

[0018] The connector converter is used to integrate the wiring of the measurement point structure onto a hot-swappable connector and connect it to the data transmission cable.

[0019] A test method for a resistivity level gauge used for measuring liquid level fluctuations in lead-based reactors, characterized in that:

[0020] The test preparation phase includes:

[0021] S101: Install the level gauge body into the test container;

[0022] S102: Confirm that all valves are closed, then open the vent valve of the storage tank, the vent valve of the test container, the inlet valve of the storage tank, and the inlet valve of the test container to allow inert gas to enter the storage tank and the test container from the cover gas inlet system pipeline and replace them, and then discharge them through the cover gas vent system pipeline. After the replacement is completed, close all the above valves.

[0023] S103: Heating of the storage tank to melt the lead-based alloy and heat it to the required temperature;

[0024] S104: Confirm the initial pressure of the storage tank and the test container using the pressure transmitter, then open the exhaust valve of the storage tank and the exhaust valve of the test container, and pressurize the storage tank and the test container through the covering gas exhaust system pipeline. After pressurization is completed, close the exhaust valve of the storage tank and the exhaust valve of the test container.

[0025] The liquid level fluctuation test phase includes:

[0026] S201: Open the regulating valve assembly to allow the liquid lead-based alloy to flow through the lead-based alloy filling and discharging pipe and the lead-based alloy filling and discharging port, and then into the test container;

[0027] S202: The real-time liquid level and filling rate of the liquid lead-based alloy are confirmed by the differential pressure transmitter, pressure sensor, and single-point level gauge group. When the liquid level approaches the measuring point structure of the lowest liquid level measuring point, the host computer starts to record the real-time partial resistance of each liquid level measuring point.

[0028] S203: When the liquid level of the lead-based alloy passes through each measuring point structure on the body of the partial resistance level gauge, the host computer records the partial resistance change process of each liquid level measuring point.

[0029] S204: After the highest measuring point on the body of the level gauge has completed the change in resistance, close and open the regulating valve group.

[0030] The drainage level fluctuation test phase includes:

[0031] S301: Open the vent valve of the storage tank and the vent valve of the test container to depressurize the storage tank and the test container to normal pressure, and then close the vent valve of the storage tank and the vent valve of the test container. The liquid discharge process is achieved only by the gravity pressure difference of the liquid lead-based alloy in the test container.

[0032] S302: Open the regulating valve assembly to allow the liquid lead-based alloy to flow through the lead-based alloy filling and discharging port and the lead-based alloy filling and discharging pipeline, and then be discharged into the storage tank.

[0033] S303: When the liquid level of the lead-based alloy passes through each measuring point structure, the host computer records the change process of the partial resistance at each liquid level measuring point;

[0034] S304: After the lowest liquid level measuring point of the liquid level gauge body completes the resistance change, close and open the regulating valve group.

[0035] After the experiment is completed, the following will be included:

[0036] S401: Turn off the controllable electric heating element and stop heating of the test container;

[0037] S402: Open the air inlet valve of the test container, pressurize the test container to a level higher than the storage tank, and then close the air inlet valve of the test container;

[0038] S403: Open the regulating valve assembly to drain the residual liquid lead-based alloy in the test container, lead-based alloy filling and draining pipeline, and filter back to the storage tank, and then close the regulating valve assembly;

[0039] S404: Turn off the electric heating of the storage tank, open the exhaust valve of the test container and the exhaust valve of the storage tank to cool and depressurize the entire test system to normal temperature and pressure.

[0040] In step S102, after the replacement is completed, both the storage tank and the test container are under normal pressure.

[0041] In step S104, the pressure of the storage tank is ensured to be greater than the sum of the pressure of the test container and the gravity pressure difference of the liquid lead-based alloy at the height of the liquid level to be filled.

[0042] In step S201, the controllable electric heating element is turned on to control the temperature of the liquid lead-based alloy being filled in.

[0043] In step S203, the feedback signals from the differential pressure transmitter, pressure sensor, and single-point level gauge group confirm whether the liquid level has reached the liquid level measuring point.

[0044] In S303, the feedback signals from the differential pressure transmitter, pressure sensor, and single-point level gauge group confirm whether the liquid level has left the liquid level measuring point.

[0045] The significant advantages of this invention are:

[0046] 1. This invention enables the integrated design of a resistive level gauge and allows it to measure levels within high-temperature liquid metal. The primary instrument of the level gauge employs a multi-point integrated resistive design with adjustable axial height and radially detachable and adjustable dimensions. This allows for adjustment of the axial rise and fall range, radial fluctuation range, and geometric space arrangement of the level according to usage requirements. Furthermore, the design of the measuring point structure effectively prevents liquid from adhering to the liquid metal.

[0047] 2. The combined design of the primary and secondary instruments for measuring the partial resistance of the liquid level gauge in this invention can effectively eliminate erroneous signals and false signal interference caused by oxide adhesion. This is because the resistance values ​​of air, oxides, and liquid lead-based alloys are different, and their partial resistance values ​​are different.

[0048] 3. The test system of the present invention can provide a liquid level gauge test environment for liquid level fluctuations and can realize the liquid level fluctuation phenomenon in liquid lead-based alloy pools. The accuracy of liquid level testing can be calibrated by multiple means, and the test system has strong repeatability.

[0049] In summary, this experimental device and method can complete the research on the partial resistance level gauge device with different liquid level fluctuation requirements and different liquid level measuring point design and layout schemes. The entire test function is complete, safe and reliable, and highly repeatable, making it possible to demonstrate the scheme and manufacture the finished product of the partial resistance level gauge in lead-based alloy pool. Attached Figure Description

[0050] Figure 1 This is a diagram of the test system.

[0051] Figure 2 This is a schematic diagram of the test container and the secondary instrument of the level gauge.

[0052] Figure 3 Schematic diagram of the resistivity level gauge body.

[0053] Figure 4-1 Schematic diagram of the measuring point structure.

[0054] Figure 4-2 Side view of the measuring point structure.

[0055] The markings in the diagram and their corresponding component names are as follows:

[0056] In the diagram: 001, storage tank; 002, armored thermocouple; 003, single-point level gauge assembly; 004, pressure transmitter; 005, manhole; 006, storage tank safety valve; 007, filter; 008, regulating valve assembly; 009, lead-based alloy filling and discharging pipeline; 010, filter screen; 011, test container safety valve; 012, test container air inlet valve; 013, storage tank air inlet valve; 014, covering gas inlet system pipeline; 015, test container exhaust valve; 016, storage tank exhaust valve; 017, covering gas exhaust system pipeline; 018, atmospheric exhaust pipeline.

[0057] Test container 101, differential pressure transmitter 102, pressure sensor 103, single-point level gauge assembly 104, armored thermocouple 105, pressure transmitter 106, controllable electric heating element 107, lead-based alloy filling and draining port 108, lead-based alloy pool 109, covering gas space 110.

[0058] 201. Wall surface of the resistance level gauge; 202. Measuring point structure; 203. Adhesive material; 204. Insulation structure; 205. Cylinder of the resistance level gauge; 206. Signal transmission cable.

[0059] The main cylinder of the resistance level gauge is 401, the telescopic tube section of the main cylinder is 402, the detachable buckle of the main cylinder is 403, the branch cylinder of the resistance level gauge is 404, and the telescopic tube section of the branch cylinder is 405.

[0060] Host computer 301, fixed resistance resistor 302, data transmission cable 303, connection converter 304. Detailed Implementation

[0061] Many specific details are set forth in the following description to provide a full understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of this application; therefore, this application is not limited to the specific embodiments disclosed below.

[0062] The terminology used in one or more embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the scope of one or more embodiments of this application. The singular forms “a,” “the,” and “the” used in one or more embodiments of this application and in the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” used in one or more embodiments of this application refers to and includes any or all possible combinations of one or more associated listed items.

[0063] It should be understood that although the terms first, second, etc., may be used to describe various information in one or more embodiments of this application, such information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, first may also be referred to as second without departing from the scope of one or more embodiments of this application, and similarly, second may also be referred to as first.

[0064] The present invention will now be described in detail with reference to the accompanying drawings and embodiments:

[0065] A resistivity-based level gauge device for measuring liquid level fluctuations in lead-based reactors includes a test system, a test container, a primary level gauge, and a secondary level gauge. Its basic test principle is based on resistivity-based level measurement, where liquid lead-based alloys have high conductivity and low resistance, while the inert gas covering them has poor conductivity and high resistance. Therefore, multiple metal cores are arranged as level measuring points on the body of the resistivity-based level gauge as the primary instrument, and the rear ends of each metal core are connected in series to the various branches of the secondary instrument. When the level measuring point is not in contact with the liquid lead-based alloy, the resistance of the metal core in the secondary instrument circuit is high; when the level measuring point comes into contact with the liquid lead-based alloy, the resistance of the metal core in the secondary instrument circuit is low. At this point, by analyzing the magnitude and location of the resistance values ​​in the secondary instrument, it can be determined which level measuring points are in contact with the liquid lead-based alloy, and thus the liquid level height and level fluctuation of the liquid lead-based alloy can be analyzed.

[0066] Among them, the liquid level gauge body and all liquid level measuring points arranged in the test container 101 are defined as primary instruments;

[0067] The series connection of the rear ends of each liquid level measuring point to form a partial resistance measuring circuit and branch is defined as a secondary instrument.

[0068] like Figure 1 As shown, the present invention relates to a resistivity level gauge device for measuring liquid level fluctuations in a lead-based alloy tank. Its test system is a test system simulating fluctuations in a lead-based alloy tank, comprising: a storage tank 001, an armored thermocouple 002, a single-point level gauge assembly 003, a pressure transmitter 004, a manhole 005, a storage tank safety valve 006, a filter 007, a regulating valve assembly 008, lead-based alloy filling and discharging pipes 009, a filter screen 010, a test container safety valve 011, a test container air inlet valve 012, a storage tank air inlet valve 013, a covering gas inlet system pipe 014, a test container exhaust valve 015, a storage tank exhaust valve 016, a covering gas exhaust system pipe 017, and an atmospheric exhaust pipe 018.

[0069] like Figure 2 As shown, the test container is a container that simulates the fluctuation of a lead-based alloy pool, and includes the following devices: test container 101, differential pressure transmitter 102, pressure sensor 103, single-point level gauge group 104, armored thermocouple 105, pressure transmitter 106, controllable electric heating element 107, lead-based alloy filling and discharging port 108, lead-based alloy pool 109, and covering gas space 110.

[0070] like Figure 3As shown, the primary instrument part of the level gauge is the level gauge body, which includes the following devices: a partial resistance level gauge wall surface 201, a measuring point structure 202, an adhesive material 203, an insulation structure 204, a partial resistance level gauge cylinder 205, a signal transmission cable 206, a partial resistance level gauge main cylinder 401, a main cylinder telescopic tube section 402, a main cylinder detachable buckle 403, a partial resistance level gauge branch cylinder 404, and a branch cylinder telescopic tube section 405.

[0071] like Figure 2 As shown, the secondary instrument part of the level gauge is a data acquisition and processing system, which includes the following devices: host computer 301, fixed resistance resistor 302, data transmission cable 303, and connection converter 304.

[0072] The test system comprises a liquid level fluctuation test system. Its storage tank 001 contains a high-temperature liquid lead-based alloy, which is heated to a specified temperature by electric heating wrapped around its outer surface. The temperature is monitored by an embedded armored thermocouple 002. The single-point level gauge group 003 consists of several single-point contact on / off level gauges vertically inserted into the storage tank 001 at different depths. Their ends contact the liquid lead-based alloy and provide feedback on / off signals to determine whether the liquid level has reached the contact height. 03 can be used to determine the liquid level change in storage tank 003; pressure transmitter 004 is used to monitor the pressure in storage tank 001; manhole 005 is used to add new solid lead-based alloy ingots to storage tank 001 to replenish the lead-based alloy before the test; storage tank safety valve 006 is a safety protection measure for storage tank 001; filter 007, regulating valve group 008, and filter screen 010 are all arranged on lead-based alloy filling and discharging pipe 009, which is the pipe connecting storage tank 001 and test container 101. The system includes a pipeline and equipment, and liquid lead-based alloy is filled into test container 101 by adjusting the pressure difference between storage tank 001 and test container 101. Filter 007 and filter screen 010 are used to filter high-melting-point oxide impurities during the filling and draining processes of test container 101 and storage tank 001, respectively. The regulating valve group 008 is an electrically controlled valve group used to regulate the filling and draining rates, and to ensure the liquid level in test container 101 fluctuates at the required rate. The test container safety valve 011 provides safety protection for test container 101. Measures: The test container inlet valve 012 and the liquid storage tank inlet valve 013 are both connected to the cover gas inlet system pipeline 014, which are used to fill and pressurize the test container 101 and the liquid storage tank 001 with inert gas, respectively; the test container exhaust valve 015 and the liquid storage tank exhaust valve 016 are both connected to the cover gas exhaust system pipeline 017, which are used to discharge and depressurize the high-pressure inert gas in the test container 101 and the liquid storage tank 001, respectively. The depressurized and discharged inert gas is finally discharged into the atmosphere through the atmospheric exhaust pipeline 018.

[0073] The test container is a liquid lead-based alloy pool supporting the test of the resistance level gauge performance. Test container 101 is a high-temperature, high-pressure container that holds the liquid lead-based alloy and measures the performance of the resistance level gauge. Test container 101 contains three methods for measuring the liquid level: a differential pressure transmitter 102 confirms the gravity pressure difference of the liquid lead-based alloy; a pressure sensor 103 monitors the gravity pressure difference of the liquid lead-based alloy above the measuring point; and a vertically inserted single-point level gauge group 104 confirms whether the liquid level has reached the end of each single-point level gauge. These three methods are mutually calibrated and work together with… The monitoring results of the resistance level gauge are compared; the armored thermocouple 105 is used to measure the temperature of the liquid lead-based alloy pool in the test container 101, the pressure transmitter 106 is used to measure the pressure of the covering gas space in the test container 101, and the controllable electric heating element 107 is used to heat and maintain the temperature of the liquid lead-based alloy pool; the lead-based alloy filling and discharging port 108 is connected to the lead-based alloy filling and discharging pipe 009, and the liquid lead-based alloy is filled into the test container 101, finally forming the lead-based alloy pool 109 with the required liquid level height, and the covering gas space 110 filled with inert gas is above the lead-based alloy pool 109.

[0074] In a preferred embodiment of the present invention, the primary instrument part of the level gauge is the body of the partial resistance level gauge, which is vertically inserted into the test container 101. The measuring point structure 202 of each level measuring point arranged in the body of the partial resistance level gauge is a metal structure, which can form a circuit when in contact with the liquid lead-based alloy and form an open circuit when not in contact, and transmit the on / off signal to the secondary instrument part of the level gauge in real time via the signal transmission cable 206. The adhesive material 203 is used to bond the measuring point structure 202 and the insulating structure 204, wherein the insulating structure 204 is an insulating material used to separate the measuring point structure 202 and the partial resistance level gauge cylinder 205, ensuring the independence of the material and structure of the measuring point structure 202. The main cylinder 401 of the resistance level gauge is a collection cylinder for several vertically measuring liquid level points, used to measure the vertical rise and fall of liquid level. The front end of the main cylinder is designed with a telescopic tube section 402, which is a telescopic mechanical structure used to adjust the overall assembly height of the vertical liquid level measuring points to meet the needs of liquid level measurement range in different test environments. Several detachable buckles 403 are arranged axially at several different heights on the main cylinder to vertically connect the branch cylinders 404 of the resistance level gauge to the main cylinder 401. Several liquid level measuring points are also arranged on the branch cylinders to measure the radial fluctuation of liquid level. At the same time, the front end of the branch cylinder is also designed with a telescopic tube section 405, which can change the radial space occupied by the resistance level gauge by extending the length of the branch cylinder, facilitating the installation of the resistance level gauge in containers of different diameters. The entire level gauge body can achieve axial and radial measurements in different containers, with different levels of fluctuation and different amplitudes of liquid level fluctuation by changing the axial main cylinder extension height, the number of radial branch cylinders, and the extension length of the radial branch cylinders.

[0075] In a preferred embodiment of the present invention, the secondary instrument part of the level gauge is a device that receives the on / off signal of the primary instrument and displays it to the user in real time. The host computer 301 is responsible for displaying the on / off status of each measuring point in real time. The fixed resistance resistor 302 is used to divide the resistance with the secondary instrument branch where each level measuring point is located, and finally obtains the real-time liquid level position of the liquid lead-based alloy, which is displayed on the host computer 301. The data transmission cable 303 is responsible for connecting the measuring point structure 202 of each level measuring point and the fixed resistance resistor 302 to form a circuit. The converter 304 is used to integrate the lines of all primary instrument level measuring points on a hot-swappable connector and connect it to the data transmission cable 303.

[0076] like Figures 1 to 2 As shown, the flow sequence of the working fluid involved in the level gauge device and test method is described below:

[0077] For liquid lead-based alloy, it is stored in storage tank 001. After being pressurized by the covering gas inlet system pipeline 014 and the storage tank inlet valve 013, it is sequentially filled and flows through filter 007, regulating valve group 008, lead-based alloy filling and discharging pipeline 009, and filter screen 010, and finally enters test container 101 until the required liquid level height for the test is reached.

[0078] For the cover gas, the cover gas consists of a standardized high-pressure inert gas injection system, which is connected to the cover gas inlet system pipe 014. When it is necessary to pressurize or replace the gas in the gas space of the storage tank 001, the cover gas enters the tank through the inlet system pipe 014 and the storage tank inlet valve 013. When it is necessary to pressurize or replace the gas in the gas space of the test container 101, the cover gas enters the tank through the inlet system pipe 014 and the test container inlet valve 012. When the storage tank 001 or the test container 101 needs to release the cover gas, the cover gas can be discharged into the cover gas exhaust system pipe 017 through the storage tank exhaust valve 016 and the test container exhaust valve 015, respectively, and finally discharged into the atmosphere through the atmospheric exhaust pipe 018.

[0079] The test method for the resistivity level gauge device used for measuring liquid level fluctuations in lead-based reactors includes the following steps during the test preparation phase: 1) Install the level gauge body of the pre-designed primary instrument section of the resistivity level gauge into the test container 101. The resistivity level gauge should be customized and assembled according to the appropriate axial main cylinder height, radial branch cylinder number, and radial branch cylinder height for this test; 2) Confirm that all valves are closed, then open the storage tank exhaust valve 016, the test container exhaust valve 015, the storage tank inlet valve 013, and the test container inlet valve 012 to allow inert gas to enter the storage tank 001 and the test container 101 from the covering gas inlet system pipe 014 and replace the inert gas. The gas is then discharged through the covering gas exhaust system pipe 017. After the replacement is complete... Close all the above valves. At this time, both the storage tank 001 and the test container 101 are in a state close to atmospheric pressure. 3) Heat the storage tank 001 by wrapping it with an electric heat tracing device to melt the lead-based alloy and heat it to the required temperature. 4) Confirm the initial pressure of the storage tank 001 and the test container 101 by pressure transmitters 004 and 106 respectively. Then open the exhaust valve 016 of the storage tank and the exhaust valve 015 of the test container respectively, and pressurize the two containers through the cover gas exhaust system pipeline 017. Ensure that the pressure of the storage tank 001 is greater than the sum of the pressure of the test container 101 and the gravity pressure difference of the liquid lead-based alloy at the liquid level to be filled. After the pressurization is completed, close the exhaust valve 016 of the storage tank and the exhaust valve 015 of the test container.

[0080] During the liquid level fluctuation test phase, 1) open the regulating valve group 008 to allow the liquid lead-based alloy to flow through the lead-based alloy filling and discharging pipe 009 and the lead-based alloy filling and discharging port 108, and begin to slowly fill the test container 101. At the same time, turn on the controllable electric heating element 107 to control the temperature of the liquid lead-based alloy being filled; 2) monitor the feedback signals of the differential pressure transmitter 102, pressure sensor 103, and single-point level gauge group 104 in real time to confirm the real-time liquid level height and filling rate of the liquid lead-based alloy. When the liquid level approaches the measuring point structure 202 of the lowest liquid level measuring point of the resistive level gauge body, The host computer 301 begins to record the real-time partial resistance of each liquid level measuring point; 3) When the liquid level of the lead-based alloy passes through each liquid level measuring point, the host computer 301 records the partial resistance change process of each liquid level measuring point, and at the same time confirms whether the liquid level has reached the liquid level measuring point through the feedback signals of the differential pressure transmitter 102, pressure sensor 103, and single-point liquid level gauge group 104, to ensure that the partial resistance change process of the liquid level measuring point is real and accurate; 4) After the highest liquid level measuring point of the partial resistance level gauge body completes the partial resistance change, the regulating valve group 008 is closed and opened, and the liquid level fluctuation test is completed.

[0081] During the liquid level fluctuation test phase, 1) open the vent valve 016 of the storage tank and the vent valve 015 of the test container to depressurize the storage tank 001 and the test container 101 to atmospheric pressure, then close the vent valve 016 of the storage tank and the vent valve 015 of the test container, and achieve the liquid discharge process solely through the gravity pressure difference of the liquid lead-based alloy in the test container 101; 2) open the regulating valve group 008 to allow the liquid lead-based alloy to flow through the lead-based alloy filling and discharging port 108 and the lead-based alloy filling and discharging pipe 009, and begin to slowly discharge into the storage tank 001. 1; 3) When the liquid level of the lead-based alloy passes through each liquid level measuring point, the host computer 301 records the partial resistance change process of each liquid level measuring point. At the same time, the feedback signals from the differential pressure transmitter 102, pressure sensor 103, and single-point liquid level gauge group 104 confirm whether the liquid level has left the liquid level measuring point, ensuring that the partial resistance change process of the liquid level measuring point is real and accurate; 4) After the lowest liquid level measuring point of the partial resistance level gauge body completes the partial resistance change, the regulating valve group 008 is closed and opened, and the liquid level fluctuation test is completed.

[0082] After the test is completed, 1) turn off the controllable electric heating element 107 to stop heating the test container 101; 2) open the test container air inlet valve 012 to pressurize the test container 101 to a level higher than the storage tank 001, and then close the test container air inlet valve 012; 3) open the regulating valve group 008 to drain the residual liquid lead-based alloy in the test container 101, the lead-based alloy filling and draining pipe 009, and the filter 007 back to the storage tank 001, and then close the regulating valve group 008; 4) turn off the electric heating of the storage tank 001, and open the test container exhaust valve 015 and the storage tank exhaust valve 016 to cool and depressurize the entire test system to room temperature and pressure.

[0083] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

[0084] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0085] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0086] The preferred embodiments disclosed above are merely illustrative of this application. The optional embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this application. These embodiments are selected and specifically described in this application to better explain the principles and practical applications of this application, thereby enabling those skilled in the art to better understand and utilize this application.

Claims

1. A resistivity level gauge device for measuring liquid level fluctuations in lead-based reactors, characterized in that: It includes a storage tank (001), a test container (101), and a partial resistance level gauge body; the partial resistance level gauge body is located in the test container 101, and measuring points are installed on it to measure the liquid level of the test container (101), while the storage tank (001) contains liquid lead-based alloy and is connected to the test container (101) through a pipeline.

2. The resistivity level gauge device for measuring liquid level fluctuations in lead-based reactors according to claim 1, characterized in that: The outer surface of the liquid storage tank (001) is wrapped with an electric heat tracing device to heat the liquid lead-based alloy, and the liquid storage tank (001) is embedded with a sheathed thermocouple (002) to monitor the temperature of the liquid lead-based alloy.

3. The resistivity level gauge device for measuring liquid level fluctuations in lead-based reactors according to claim 2, characterized in that: The liquid storage tank (001) includes a gas section and a liquid section. The liquid section contains a single-point level gauge group (003). The single-point level gauge group (003) consists of several single-point contact on / off level gauges that are vertically inserted into the liquid storage tank (001) at different depths. It is used to determine the liquid level change in the liquid storage tank (003).

4. The resistivity level gauge device for measuring liquid level fluctuations in lead-based reactors according to claim 3, characterized in that: A pressure transmitter (004) is installed in the gas section of the liquid storage tank (001) to monitor the pressure inside the liquid storage tank (001).

5. A resistivity level gauge device for measuring liquid level fluctuations in lead-based reactors according to claim 4, characterized in that: The storage tank (001) has a manhole (005) through which solid lead-based alloy ingots are fed into the storage tank (001).

6. The resistivity level gauge device for measuring liquid level fluctuations in lead-based reactors according to claim 5, characterized in that: The liquid portion of the storage tank (001) is connected to the test container (101) through the lead-based alloy filling and draining pipe (009), and the filter (007), regulating valve group (008), and filter screen (010) are all arranged on the lead-based alloy filling and draining pipe (009). The liquid lead-based alloy is filled into the test container (101) by adjusting the pressure difference between the storage tank (001) and the test container (101).

7. A resistivity level gauge device for measuring liquid level fluctuations in lead-based reactors according to claim 6, characterized in that: The cover gas inlet system pipeline (014) is connected to the storage tank (001) and the test container (101), and the connecting pipeline is equipped with a storage tank inlet valve (013) and a test container inlet valve (012), which are used to fill the storage tank (001) and the test container (101) with inert gas and pressurize them, respectively; the storage tank (001) and the test container (101) are both connected to the cover gas exhaust system pipeline (017), and the connecting pipeline is equipped with a storage tank exhaust valve (016) and a test container exhaust valve (015), respectively; the cover gas exhaust system pipeline (017) is connected to the atmospheric exhaust pipeline (018); and the test container (101) is equipped with a test container safety valve (011).

8. The resistivity level gauge device for measuring liquid level fluctuations in lead-based reactors according to claim 7, characterized in that: The test container (101) includes a covering gas space (110) and a liquid lead-based alloy pool (109); a sheathed thermocouple (105), a pressure transmitter (106), and a controllable electric heating element (107) are installed inside it. The sheathed thermocouple (105) is used to measure the temperature of the liquid lead-based alloy pool in the test container (101), the pressure transmitter (106) is used to measure the pressure of the covering gas space in the test container (101), and the controllable electric heating element (107) is used to heat and maintain the temperature of the liquid lead-based alloy pool.

9. A resistivity level gauge device for measuring liquid level fluctuations in lead-based reactors according to claim 8, characterized in that: The test container (101) has a lead-based alloy filling and draining port (108) at the bottom. The lead-based alloy filling and draining port (108) is connected to the lead-based alloy filling and draining pipe (009) and liquid lead-based alloy is filled into the test container (101) to form a lead-based alloy pool (109) with the required liquid level. Above the lead-based alloy pool (109) is a covering gas space (110) filled with inert gas.

10. A resistivity level gauge device for measuring liquid level fluctuations in lead-based reactors according to claim 9, characterized in that: The test container (101) is equipped with a differential pressure transmitter (102), a pressure sensor (103), and a single-point level gauge group (104) to determine the liquid level in the test container (101) respectively. The three liquid level measurement methods are mutually calibrated and compared with the monitoring results of the partial resistance level gauge.

11. A resistivity level gauge device for measuring liquid level fluctuations in lead-based reactors according to claim 10, characterized in that: The body of the resistance level gauge is vertically inserted into the test container (101), which includes the main cylinder of the resistance level gauge (401); the front end of the main cylinder of the resistance level gauge (401) has a main cylinder telescopic tube section (402), and the main cylinder (401) has several main cylinder detachable buckles (403) arranged axially at different heights. The branch cylinder of the resistance level gauge (404) is vertically connected to the main cylinder (401) through the main cylinder detachable buckles (403). The front end of the branch cylinder of the resistance level gauge (404) has a branch cylinder telescopic tube section (405); the wall surface of the main cylinder of the resistance level gauge (401) and the wall surface of the branch cylinder of the resistance level gauge (404) have multiple measuring point structures (202) to form liquid level measuring points.

12. A resistivity level gauge device for measuring liquid level fluctuations in lead-based reactors according to claim 11, characterized in that: The measuring point structure (202) is a metal structure that can form a circuit when in contact with liquid lead-based alloy and an open circuit when not in contact, and transmit the on / off signal in real time via the signal transmission cable (206); the adhesive material (203) is used to bond the measuring point structure (202) and the insulating structure (204), wherein the insulating structure (204) is an insulating material used to separate the measuring point structure (202) and the body of the resistance level gauge (205).

13. A resistivity level gauge device for measuring liquid level fluctuations in lead-based reactors according to claim 12, characterized in that: All measuring point structures (202) in the test container (101) are primary instruments. All measuring point structures (202) are connected to the host computer (301) through data transmission cables (303). The host computer (301) displays the on / off status of each measuring point.

14. A resistivity level gauge device for measuring liquid level fluctuations in lead-based reactors according to claim 13, characterized in that: The connector converter (304) is used to integrate the wiring of the measuring point structure (202) onto a hot-swappable connector and connect it to the data transmission cable (303).

15. A test method for a resistivity level gauge for measuring liquid level fluctuations in lead-based reactors, using the apparatus described in claim 14, characterized in that: The test preparation phase includes: S101: Install the level gauge body into the test container (101); S102: Confirm that all valves are closed, then open the storage tank exhaust valve (016), test container exhaust valve (015), storage tank inlet valve (013), and test container inlet valve (012) to allow inert gas to enter the storage tank (001) and test container (101) from the cover gas inlet system pipe (014) and replace it, and then discharge it through the cover gas exhaust system pipe (017). After the replacement is completed, close all the above valves. S103: Heating of the storage tank (001) to melt the lead-based alloy and heat it to the required temperature; S104: Confirm the initial pressure of the storage tank (001) and the test container (101) using pressure transmitters (004) and (106) respectively. Then, open the storage tank exhaust valve (016) and the test container exhaust valve (015) respectively, and pressurize the storage tank (001) and the test container (101) through the covering gas exhaust system pipeline (017). After pressurization is completed, close the storage tank exhaust valve (016) and the test container exhaust valve (015). The liquid level fluctuation test phase includes: S201: Open the regulating valve group (008) to allow the liquid lead-based alloy to flow through the lead-based alloy filling and discharging pipe (009) and the lead-based alloy filling and discharging port (108) and be filled into the test container (101); S202: The real-time liquid level and filling rate of the liquid lead-based alloy are confirmed by the differential pressure transmitter (102), pressure sensor (103), and single-point liquid level gauge group (104). When the liquid level approaches the measuring point structure (202) of the lowest liquid level measuring point, the host computer (301) starts to record the real-time partial resistance of each liquid level measuring point. S203: When the liquid level of the liquid lead-based alloy passes through each measuring point structure (202) on the body of the partial resistance level gauge, the host computer (301) records the partial resistance change process of each liquid level measuring point. S204: After the highest measuring point structure (202) on the body of the level gauge completes the resistance change, the regulating valve group (008) is closed and opened. The drainage level fluctuation test phase includes: S301: Open the vent valve (016) of the storage tank and the vent valve (015) of the test container to depressurize the storage tank (001) and the test container (101) to normal pressure, and then close the vent valve (016) of the storage tank and the vent valve (015) of the test container. The liquid discharge process is achieved only by the gravity pressure difference of the liquid lead-based alloy in the test container (101). S302: Open the regulating valve group (008) to allow the liquid lead-based alloy to flow through the lead-based alloy filling and discharging port (108) and the lead-based alloy filling and discharging pipeline (009) and be discharged into the storage tank (001); S303: When the liquid level of the liquid lead-based alloy passes through each measuring point structure (202), the host computer (301) records the change process of the partial resistance of each liquid level measuring point; S304: After the lowest liquid level measuring point of the liquid level gauge body completes the change in resistance, close the opening regulating valve group (008).

16. The test method for a resistivity level gauge for measuring liquid level fluctuation in a lead-based reactor according to claim 15, characterized in that: After the experiment is completed, the following will be included: S401: Turn off the controllable electric heating element (107) and stop the heating of the test container (101); S402: Open the air inlet valve (012) of the test container, pressurize the test container (101) to a level higher than that of the storage tank (001), and then close the air inlet valve (012) of the test container; S403: Open the regulating valve group (008) to drain the residual liquid lead-based alloy in the test container (101), lead-based alloy filling and draining pipe (009), and filter (007) back to the storage tank (001), and then close the regulating valve group (008); S404: Turn off the electric heating of the liquid storage tank (001), open the exhaust valve (015) of the test container and the exhaust valve (016) of the liquid storage tank to cool down and depressurize the entire test system to normal temperature and pressure.

17. The test method for a resistivity level gauge for measuring liquid level fluctuation in a lead-based reactor according to claim 15, characterized in that: In step S102, after the replacement is completed, both the storage tank (001) and the test container (101) are under normal pressure.

18. The test method for a resistivity level gauge for measuring liquid level fluctuations in a lead-based reactor according to claim 15, characterized in that: In step S104, the pressure of the storage tank (001) is ensured to be greater than the sum of the pressure of the test container (101) and the gravity pressure difference of the liquid lead-based alloy at the height of the liquid level to be filled.

19. The test method for a resistivity level gauge for measuring liquid level fluctuation in a lead-based reactor according to claim 15, characterized in that: In step S201, the controllable electric heating element (107) is turned on to control the temperature of the liquid lead-based alloy being filled in.

20. The test method for a resistivity level gauge for measuring liquid level fluctuation in a lead-based reactor according to claim 15, characterized in that: In S203, the feedback signals from the differential pressure transmitter (102), pressure sensor (103), and single-point level gauge group (104) are used to confirm whether the liquid level has reached the liquid level measuring point.

21. The test method for a resistivity level gauge for measuring liquid level fluctuations in a lead-based reactor according to claim 15, characterized in that: In S303, the feedback signals from the differential pressure transmitter (102), pressure sensor (103), and single-point level gauge group (104) confirm whether the liquid level has left the liquid level measuring point.

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