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CN-122016002-A - Resistance-dividing liquid level meter device for measuring liquid level fluctuation of lead-based pile and test method

CN122016002ACN 122016002 ACN122016002 ACN 122016002ACN-122016002-A

Abstract

A split resistance liquid level meter device for measuring liquid level fluctuation of a lead-based pile and a test method thereof are provided, and the split resistance liquid level meter device comprises a liquid storage tank, a test container and a split resistance liquid level meter body, wherein the split resistance liquid level meter body is positioned in the test container, a measuring point is arranged on the split resistance liquid level meter body to measure the liquid level of the test container, and the liquid storage tank is internally provided with a liquid lead-based alloy and is connected with the test container through a pipeline. The liquid level fluctuation test environment of the liquid lead-based alloy can be realized by constructing an adjustable liquid filling and discharging test system and a test container, the liquid lead-based alloy states of a plurality of factors such as different liquid lead-based alloy temperatures, liquid level fluctuation amplitude, liquid level fluctuation rate and the like can be realized, and the liquid level fluctuation conditions under each state can be captured, judged and displayed by using a split-resistance liquid level meter.

Inventors

  • YU QIFAN
  • LAN ZHIKE
  • ZHOU HAN
  • WANG SUHAO
  • GUO JING
  • JIANG QINGYU
  • WANG JIANYU

Assignees

  • 中国核动力研究设计院

Dates

Publication Date
20260512
Application Date
20251028

Claims (20)

  1. 1. The split resistance liquid level meter device for measuring the fluctuation of the liquid level of the lead-based stack is characterized by comprising a liquid storage tank (001), a test container (101) and a split resistance liquid level meter body, wherein the split resistance liquid level meter body is arranged in the test container 101, a measuring point is arranged on the split resistance liquid level meter body to measure the liquid level of the test container (101), and a liquid lead-based alloy is arranged in the liquid storage tank (001) and is connected with the test container (101) through a pipeline.
  2. 2. The split resistance liquid level meter device for measuring the fluctuation of the liquid level of the lead-based stack according to claim 1, wherein the outer surface of the liquid storage tank (001) is wound with electric tracing so as to heat the liquid lead-based alloy, and the liquid storage tank (001) is embedded with an armored thermocouple (002) so as to monitor the temperature of the liquid lead-based alloy.
  3. 3. The split-resistance liquid level meter device for lead-based stack liquid level fluctuation measurement according to claim 2, wherein the liquid storage tank (001) comprises a gas part and a liquid part, the liquid part is internally provided with a single-point liquid level meter group (003), and the single-point liquid level meter group (003) is a plurality of single-point contact on-off liquid level meters which are vertically inserted into different depths of the liquid storage tank (001) and are used for judging the liquid level change condition in the liquid storage tank (003).
  4. 4. A split resistance liquid level meter device for lead-based stack liquid level fluctuation measurement according to claim 3, wherein a pressure transmitter (004) is arranged in a gas part of the liquid storage tank (001), and the pressure in the liquid storage tank (001) is monitored.
  5. 5. The split resistance liquid level meter device for lead-based stack liquid level fluctuation measurement according to claim 4, wherein a manhole (005) is formed in the liquid storage tank (001), and solid lead-based alloy ingots are put into the liquid storage tank (001) through the manhole (005).
  6. 6. A minute-resistance liquid level meter device for lead-based pile level fluctuation measurement according to claim 5, characterized in that the liquid portion of the liquid storage tank (001) is connected to the test vessel (101) through a lead-based alloy charging and discharging pipe (009), and the filter (007), the regulating valve group (008), the filter screen (010) are all arranged on the lead-based alloy charging and discharging pipe (009), and the liquid lead-based alloy is charged into the test vessel (101) by regulating the pressure difference between the liquid storage tank (001) and the test vessel (101).
  7. 7. A split resistance liquid level meter device for lead-based stack liquid level fluctuation measurement according to claim 6, wherein a cover gas inlet system pipeline (014) is connected with a liquid storage tank (001) and a test container (101), a liquid storage tank air inlet valve (013) and a test container air inlet valve (012) are respectively arranged on the connecting pipeline and are respectively used for filling inert gas into the liquid storage tank (001) and the test container (101) and pressurizing, the liquid storage tank (001) and the test container (101) are respectively communicated with a cover gas exhaust system pipeline (017), a liquid storage tank air outlet valve (016) and a test container air outlet valve (015) are respectively arranged on the connecting pipeline, the cover gas exhaust system pipeline (017) is connected with an atmosphere air exhaust pipeline (018), and a test container safety valve (011) is arranged on the test container (101).
  8. 8. A split resistance level gauge apparatus for lead-based stack level fluctuation measurement as set forth in claim 7, wherein the test vessel (101) comprises a blanket gas space (110) and a liquid lead-based alloy pool (109), wherein an armored thermocouple (105), a pressure transmitter (106) and a controllable electric heating element (107) are installed, wherein the armored thermocouple (105) is used for measuring the temperature of the liquid lead-based alloy pool in the test vessel (101), the pressure transmitter (106) is used for measuring the blanket gas space pressure in the test vessel (101), and the controllable electric heating element (107) is used for heating and maintaining the temperature of the liquid lead-based alloy pool.
  9. 9. A minute-resistance liquid level meter device for lead-based pile liquid level fluctuation measurement according to claim 8, wherein the bottom of the test container (101) is provided with a lead-based alloy charging and discharging pipe orifice (108), the lead-based alloy charging and discharging pipe orifice (108) is communicated with the lead-based alloy charging and discharging pipe orifice (009), liquid lead-based alloy is charged into the test container (101) to form a lead-based alloy pool (109) with a required liquid level, and a cover gas space (110) filled with inert gas is arranged above the lead-based alloy pool (109).
  10. 10. A split resistance level gauge apparatus for lead-based stack level fluctuation measurement as set forth in claim 9, wherein a differential pressure transmitter (102), a pressure sensor (103) and a single point level gauge set (104) are installed in the test vessel (101) to determine the level of the liquid in the test vessel (101) respectively, and the three level measurement means are mutually calibrated and commonly compared with the monitoring result of the split resistance level gauge.
  11. 11. The split resistor liquid level meter device for lead-based stack liquid level fluctuation measurement is characterized in that a split resistor liquid level meter body is vertically inserted into a test container (101) and comprises a split resistor liquid level meter main cylinder body (401), a main cylinder telescopic pipe section (402) is arranged at the front end of the split resistor liquid level meter main cylinder body (401), a plurality of main cylinder detachable buckles (403) are axially arranged on different heights of the main cylinder body (401), a split resistor liquid level meter branch cylinder body (404) is vertically connected with the main cylinder body (401) through the main cylinder detachable buckles (403), a branch cylinder telescopic pipe section (405) is arranged at the front end of the resistor liquid level meter branch cylinder body (404), and a plurality of measuring point structures (202) are arranged on the wall surface of the split resistor liquid level meter main cylinder body (401) and the wall surface of the split resistor liquid level meter branch cylinder body (404) to form liquid level measuring points.
  12. 12. The device for measuring the fluctuation of the liquid level of the lead-based stack, as set forth in claim 11, wherein the measuring point structure (202) is a metal structure capable of forming a passage when contacting the liquid lead-based alloy, forming an open circuit when not contacting the liquid lead-based alloy, and transmitting the on-off signal in real time through the signal transmission cable (206), and the bonding material (203) is used for bonding the measuring point structure (202) and the insulating structure (204), wherein the insulating structure (204) is an insulating material for separating the measuring point structure (202) and the barrel body (205) of the split-resistance liquid level meter.
  13. 13. The split-resistance liquid level meter device for lead-based stack liquid level fluctuation measurement according to claim 12, wherein all measuring point structures (202) in the test container (101) are primary meters, all measuring point structures (202) are connected with an upper computer (301) through a data transmission cable (303), and the upper computer (301) displays the on-off condition of each measuring point.
  14. 14. A split resistance level gauge apparatus for lead-based stack level fluctuation measurement as set forth in claim 13, wherein the connection transducer (304) is configured to integrate wiring of the site structure (202) on a hot plug connector and connect with the data transfer cable (303).
  15. 15. A split resistance level gauge test method for lead-based stack level fluctuation measurement, employing the apparatus of claim 14, characterized by: The test preparation stage comprises the following steps: S101, installing a liquid level meter body into a test container (101); S102, confirming that all valves are closed, then opening a liquid storage tank exhaust valve (016), a test container exhaust valve (015), a liquid storage tank air inlet valve (013) and a test container air inlet valve (012), allowing inert gas to enter a liquid storage tank (001) and a test container (101) from a cover gas inlet system pipeline (014) for replacement, then discharging through a cover gas exhaust system pipeline (017), and closing all the valves after replacement is completed; S103, heating a liquid storage tank (001) to enable the lead-base alloy to be melted and heated to a required temperature; S104, confirming initial pressures of the liquid storage tank (001) and the test container (101) through a pressure transmitter (004) and a pressure transmitter (106), then respectively opening a liquid storage tank exhaust valve (016) and a test container exhaust valve (015), pressurizing the liquid storage tank (001) and the test container (101) through a cover gas exhaust system pipeline (017), and closing the liquid storage tank exhaust valve (016) and the test container exhaust valve (015) after the pressurization is finished; the liquid filling level fluctuation test stage comprises the following steps: s201, opening an adjusting valve group (008), allowing the liquid lead-base alloy to flow through a lead-base alloy charging and discharging pipeline (009) and a lead-base alloy charging and discharging pipeline (108), and charging into a test container (101); S202, confirming the real-time liquid level and liquid filling rate of the liquid lead-base alloy through a differential pressure transmitter (102), a pressure sensor (103) and a single-point liquid level meter group (104), and when the liquid level approaches to a measuring point structure (202) of the lowest liquid level measuring point, starting to record the real-time minute resistance of each liquid level measuring point by an upper computer (301); S203, when the liquid level of the liquid lead-base alloy passes through each measuring point structure (202) on the liquid level meter body with a partial resistance, the upper computer (301) records the partial resistance change process of each liquid level measuring point; s204, closing and opening the regulating valve group (008) after the highest measuring point structure (202) on the resistance liquid level meter body to be separated finishes resistance separation; The liquid level fluctuation test stage of the liquid discharge comprises the following steps: S301, opening a liquid storage tank exhaust valve (016) and a test container exhaust valve (015), releasing the pressure of the liquid storage tank (001) and the test container (101) to normal pressure, and then closing the liquid storage tank exhaust valve (016) and the test container exhaust valve (015), wherein the liquid discharge process is realized only through the gravity pressure difference of the liquid lead-base alloy in the test container (101); S302, opening an adjusting valve group (008) to enable the liquid lead-base alloy to flow through a lead-base alloy charging and discharging pipe (108) and a lead-base alloy charging and discharging pipeline (009) and discharging the liquid storage tank (001); s303, when the liquid level of the liquid lead-base alloy passes through each measuring point structure (202), the upper computer (301) records the resistance change process of each liquid level measuring point; S304, closing and opening the regulating valve group (008) after the lowest liquid level measuring point of the split resistance liquid level meter body finishes the split resistance change.
  16. 16. The method for measuring the fluctuation of the liquid level of the lead-based pile according to claim 15, wherein the method comprises the following steps of: s401, turning off the controllable electric heating element (107) to stop heating the test container (101); S402, opening a test container air inlet valve (012), pressurizing the test container (101) to be higher than the liquid storage tank (001), and then closing the test container air inlet valve (012); s403, opening a regulating valve group (008), discharging residual liquid lead-base alloy in the test container (101), the lead-base alloy charging and discharging pipeline (009) and the filter (007) back to the liquid storage tank (001), and then closing the regulating valve group (008); S404, closing the liquid storage tank (001) for electric tracing, and opening the exhaust valve (015) and the exhaust valve (016) of the liquid storage tank to cool and reduce the temperature of the whole test system to a normal temperature and normal pressure state.
  17. 17. The method for measuring the fluctuation of the liquid level of the lead-based stack according to claim 15, wherein in the step S102, after the replacement is completed, the liquid storage tank (001) and the test container (101) are both in a normal pressure state.
  18. 18. The method for measuring the fluctuation of the liquid level of the lead-based stack according to claim 15, wherein in the step S104, the pressure of the liquid storage tank (001) is ensured to be larger 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. 19. A split resistance level gauge test method for lead-based stack level fluctuation measurement as set forth in claim 15, wherein in said S201, a controllable electric heating element (107) is turned on to control the temperature of the charged liquid lead-based alloy.
  20. 20. The method for measuring the fluctuation of the liquid level of the lead-based stack according to claim 15, wherein in the step S203, whether the liquid level reaches the liquid level measuring point is confirmed by feedback signals of a differential pressure transmitter (102), a pressure sensor (103) and a single-point type liquid level meter group (104).

Description

Resistance-dividing liquid level meter device for measuring liquid level fluctuation of lead-based pile and test method Technical Field The invention relates to the technical field of lead-based reactors, in particular to a split resistance liquid level meter device for measuring liquid level fluctuation of a lead-based reactor and a test method. Background Lead-based stacks are one of the important directions of fourth generation nuclear power technology, and the unique coolant safety and fuel breedability are important inherent safety advantages. In addition, to improve economy, lead-based stack-to-loop lead-based alloy coolant systems are typically designed as pool-type in which steam generators, main pumps, cores, internals, etc. are immersed. Since different devices are located in different cavity areas in the tank, the liquid level in different areas of the lead-base alloy tank is different when the circuit is in steady state operation, and the liquid level in each area also fluctuates when the circuit is in transient operation. The above phenomenon shows that it is necessary to install liquid level monitoring devices in different cavity areas of the lead-based alloy bath. The design thought of the existing liquid level monitoring device comprises a float type liquid level meter, a magnetostrictive liquid level meter, a capacitive liquid level meter, a differential pressure type liquid level meter, an ultrasonic liquid level meter, a microwave radar liquid level meter, an optical fiber liquid level meter and a mutual inductance type liquid level meter. The float type, magnetostrictive type, capacitive type and differential pressure type liquid level meters are all contact type liquid level meters, and the liquid level height is monitored in real time by contacting with a measured working medium and changing the position of a float, torsional waves, capacitance values and gravity differential pressure changes. However, the corrosion problem of the lead-base alloy to the liquid level meter after long-time soaking and the high-temperature working condition operation problem of the lead-base alloy lead to the fact that the three contact type liquid level meters are not suitable for liquid level monitoring of the lead-base alloy. The ultrasonic wave, the microwave radar and the optical fiber are non-contact liquid level meters, and the liquid level position is fed back in real time through the propagation characteristic difference of the ultrasonic wave, the microwave and the light source in the lead-base alloy pool and the air space above. However, the three liquid level meters can also obviously influence the measurement accuracy under high corrosion and high temperature environments. The primary instrument of the mutual inductance type liquid level meter directly contacts liquid, and the secondary instrument receives, judges and outputs the signal conduction difference before and after the primary instrument contacts the liquid, so that the mutual inductance type liquid level meter is a feasible scheme for measuring the liquid level of the lead-base alloy. However, the primary instrument of the existing mutual inductance type liquid level meter does not perform material and structure design optimization aiming at the use environment of a lead-base alloy pool, and lacks a liquid level meter function test environment in the lead-base alloy environment. Disclosure of Invention The invention aims to provide a split resistance liquid level meter device and a test method for measuring liquid level fluctuation of a lead-based pile, which are used for realizing a liquid level fluctuation test environment of a liquid lead-based alloy by constructing an adjustable liquid charging and discharging test system and a test container, realizing measurement of each liquid level measuring point with different heights in the liquid lead-based alloy by a multi-point primary meter design of a split resistance, and judging and displaying whether each liquid level measuring point is contacted with the liquid lead-based alloy or not by a secondary meter design of a split resistance, and further judging the liquid level position and fluctuation condition of the liquid lead-based alloy by a split resistance distinction corresponding to different resistance values of the liquid lead-based alloy, air and oxide impurities of an upper computer. The test system of the test can realize the states of the liquid lead-based alloy with different liquid lead-based alloy temperature, liquid level fluctuation amplitude, liquid level fluctuation speed and other factors, and captures, judges and displays the liquid level fluctuation condition under each state by using the split resistance liquid level meter. The technical scheme is that the split-resistance liquid level meter device for measuring the fluctuation of the liquid level of the lead-based pile comprises a liquid storage tank, a test container and a split-resistance liquid level mete