CN117554461A - Calibration method and calibration device of hydrogen meter - Google Patents

Abstract

Embodiments of the present application relate to testing or analyzing materials by measuring their chemical or physical properties, and specifically relate to a calibration method and calibration device of a hydrogen meter. The calibration method includes: injecting hydrogen-containing gas into the liquid alkali metal circuit to form a hydrogen-containing alkali metal liquid containing hydrogen-containing compounds; determining the concentration of hydrogen in the liquid alkali metal circuit; using a high vacuum system, mass spectrometer and ion pump to achieve incoming calibration Detection of the composition and concentration of gas in the hydrogen permeation structure; calibrating the gas concentration detected by the ion pump based on the concentration of hydrogen in the liquid alkali metal circuit and the gas composition detected by the mass spectrometer. The calibration device includes a liquid alkali metal circuit through which liquid alkali metal flows, a hydrogen supply part for supplying hydrogen-containing gas, a control part for controlling the hydrogen meter, and a processing part for calibrating the hydrogen meter. The calibration method and calibration device of the hydrogen meter provided by the embodiments of the present application can make the detection results of the calibrated hydrogen meter more accurate and reliable.

Description

Calibration method and calibration device of hydrogen meter

Technical field

Embodiments of the present application relate to testing or analyzing materials by measuring their chemical or physical properties, and specifically relate to a calibration method and calibration device of a hydrogen meter.

Background technique

Diffusion hydrogen meters work on the principle of diffusion and penetration of hydrogen through nickel. The diffusion hydrogen meter uses a thin-walled nickel tube as a sensor. One side of the sensor is connected to the sodium and argon gas of the steam generator or superheater, and the other side is connected to the vacuum system. When water/water vapor leaks, the sodium-water reaction generates hydrogen gas and hydrogen ions. The hydrogen concentration in the sodium and argon gas increases, and the hydrogen diffuses into the vacuum system through the nickel tube. In this way, the hydrogen partial pressure in the vacuum system increases, which is related to the high The ion pump connected to the vacuum system can detect changes in hydrogen partial pressure, thereby knowing the size of the leak and the leak rate.

When using a hydrogen meter to detect the hydrogen concentration in liquid metal sodium or high-temperature argon in a fast neutron reactor, the hydrogen meter needs to be able to accurately detect changes in hydrogen concentration and generate a response signal when the hydrogen concentration changes. Therefore, diffusion hydrogen meter equipment needs to be calibrated before use or after long-term use to ensure the validity of monitoring data.

Contents of the invention

In view of the above technical problems, embodiments of the present application provide a calibration method and calibration device of a hydrogen meter to calibrate the hydrogen meter, thereby improving the accuracy of the hydrogen meter measurement results.

In a first aspect, embodiments of the present application provide a calibration method for a hydrogen meter, wherein the hydrogen meter includes a measurement chamber, a hydrogen permeability structure, a mass spectrometer, and a high vacuum system containing an ion pump, and the measurement chamber is used to receive a hydrogen-containing alkali. Metal liquid, hydrogen permeability structure is located in the measurement chamber, and the high vacuum system is used to provide a high vacuum environment for the hydrogen permeation structure to allow hydrogen in the hydrogen-containing alkali metal liquid to permeate into the hydrogen permeation structure; wherein, the calibration method includes: providing A liquid alkali metal circuit for the flow of liquid alkali metal; injecting hydrogen-containing gas into the liquid alkali metal circuit to form a hydrogen-containing alkali metal liquid containing hydrogen-containing compounds; determining the concentration of hydrogen in the liquid alkali metal circuit; using a high vacuum system to Hydrogen and other gases in the hydrogen-containing alkali metal liquid penetrate into the hydrogen permeation structure; use a mass spectrometer to detect the gas composition entering the hydrogen permeation structure; use an ion pump to detect the gas concentration entering the hydrogen permeation structure; according to the hydrogen in the liquid alkali metal circuit The concentration and the gas composition detected by the mass spectrometer are used to calibrate the gas concentration detected by the ion pump.

In a second aspect, embodiments of the present application provide a calibration device for a hydrogen meter. The hydrogen meter includes a measurement chamber, a hydrogen permeability structure, a mass spectrometer, and a high vacuum system containing an ion pump. The measurement chamber is used to receive a hydrogen-containing alkali metal liquid. , the hydrogen permeation structure is located in the measurement chamber, and the high vacuum system is used to provide a high vacuum environment for the hydrogen permeation structure to allow hydrogen in the hydrogen-containing alkali metal liquid to permeate into the hydrogen permeation structure. Among them, the calibration device includes: a liquid alkali metal circuit for supplying the flow of liquid alkali metal. The liquid alkali metal circuit has a calibration interface. The calibration interface is used to connect the measurement cavity of the hydrogen meter so that the liquid alkali metal can enter the measurement cavity of the hydrogen meter. ; The hydrogen supply part is used to supply hydrogen-containing gas to the liquid alkali metal circuit to form a hydrogen-containing alkali metal liquid containing hydrogen-containing compounds; the control part is used to control the opening of the high vacuum system of the hydrogen meter so that the gas entering the measurement chamber Hydrogen and other gases in the liquid alkali metal enter the hydrogen permeation structure, control the mass spectrometer to detect the gas composition entering the hydrogen permeation structure, and control the ion pump to detect the gas concentration entering the hydrogen permeation structure; and a processing part for controlling the liquid alkali metal circuit The concentration of hydrogen in the medium and the gas composition detected by the mass spectrometer calibrate the gas concentration detected by the ion pump.

The calibration method and calibration device of the hydrogen meter provided by the embodiments of the present application can calibrate the gas concentration detected by the ion pump according to the concentration of hydrogen in the liquid alkali metal circuit and the gas composition detected by the mass spectrometer, so that the calibrated hydrogen The meter measurement results are more accurate.

Description of the drawings

Through the following description of the embodiments of the present application with reference to the accompanying drawings, other objects and advantages of the present application will be apparent and may help to have a comprehensive understanding of the present application.

Figure 1 is a schematic structural diagram of a hydrogen meter according to an embodiment of the present application;

Figure 2 is a schematic schematic diagram of the calibration device according to the embodiment of the present application;

Figure 3 is a schematic flow chart of the calibration method of the hydrogen meter according to the embodiment of the present application.

Explanation of reference symbols:

10. Liquid alkali metal circuit; 101. Calibration interface; 102. First pipeline; 1021. First pipeline valve; 1022. First pipeline electric valve; 1023. First pipeline flow meter; 103. Second pipeline 1031. Second pipeline valve; 1032. Second pipeline valve; 1033. Second pipeline valve; 1034. Second pipeline flow meter; 104. Third pipeline; 105. Fourth pipeline; 1051 , the fourth pipeline valve; 106. the fifth pipeline; 1061. the fifth pipeline valve; 11. hydrogen supply department; 111. hydrogen pipeline; 1111. hydrogen interface; 12. control department; 13. processing department; 14 , obstruction meter; 141. obstruction meter valve; 142. obstruction meter valve; 15. cooling department; 151. cooling valve; 152. cooling valve; 16. buffer tank; 17. inert gas supply department; 171. gas pipeline; 1711 , valve; 172, gas pipeline; 1721, valve; 1722, valve; 173, gas pipeline; 1731, valve; 18, electromagnetic pump; 19, liquid alkali metal container; 20, vacuum department; 201, vacuum valve; 21 , cooling fan; 22. air cooler; 221. air cooling valve; 25. temperature measuring piece; 31. instrument;

8. Hydrogen meter; 81. Electromagnetic driving equipment; 82. Heating device; 83. Measuring chamber; 831. Inner casing; 832. Outer casing; 84. Hydrogen permeability structure; 85. High vacuum system; 86. Ion pump; 87 , mass spectrometer.

It should be noted that the drawings are not necessarily drawn to scale, but are only shown in a schematic manner that does not affect the reader's understanding.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be clearly and completely described below in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiment is one embodiment of the present application, but not all embodiments. Based on the described embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present application.

It should be noted that, unless otherwise defined, the technical terms or scientific terms used in this application should have the usual meanings understood by those with ordinary skills in the field to which this application belongs. If descriptions such as "first" and "second" are involved in the full text, the descriptions such as "first" and "second" are only used to distinguish similar objects and cannot be understood as indicating or implying their relative importance or sequence. The order or implicit indication of the number of technical features indicated should be understood to mean that the data described by "first", "second", etc. can be interchanged under appropriate circumstances. If "and/or" appears in the entire text, it means that it includes three parallel plans. Taking "A and/or B" as an example, it includes plan A, or plan B, or a plan that satisfies both A and B at the same time. In addition, for ease of description, spatially relative terms, such as "above", "below", "top", "bottom", etc., may be used herein, and are only used to describe the relationship between one device or feature as shown in the figures and other devices or features. The spatial positional relationship of features should be understood to also include different orientations in use or operation in addition to the orientation shown in the figures.

When using a hydrogen meter to detect the hydrogen concentration in liquid metal sodium or high-temperature argon in a fast neutron reactor, the hydrogen meter needs to be able to accurately detect changes in hydrogen concentration and generate a response signal when the hydrogen concentration changes. Therefore, diffusion hydrogen meter equipment needs to be calibrated before use or after long-term use to ensure the validity of monitoring data.

To address the above technical problems, embodiments of the present application provide a calibration device for a hydrogen meter. As shown in Figure 1, it shows a schematic structural diagram of a hydrogen meter 8 to be calibrated in an embodiment of the present application. The hydrogen meter 8 may include a measurement chamber 83, a hydrogen permeation structure 84, a mass spectrometer 87 and a high vacuum system 85 containing an ion pump. The measurement chamber 83 is used to receive hydrogen-containing alkali metal liquid, and the hydrogen permeation structure 84 is partially located in the measurement chamber 83. , the high vacuum system 85 is used to provide a high vacuum environment for the hydrogen permeation structure 84 so that the hydrogen in the hydrogen-containing alkali metal liquid permeates into the hydrogen permeation structure 84 .

It is easy to understand that for the hydrogen permeable structure 84, the transmittance of small molecules is high and the transmittance of macromolecules is low. Therefore, most of the hydrogen in the liquid metal and/or inert gas will enter the hydrogen permeable structure 84, and a small amount of oxygen will enter the hydrogen permeable structure 84. Other gases such as nitrogen may also diffuse into the hydrogen permeable structure 84 . The mass spectrometer 87 can detect the components of the gas entering the hydrogen permeation structure 84, such as detecting the contents of various gases such as hydrogen, oxygen, nitrogen, etc. in the gas within the hydrogen permeation structure 84. Ion pump 86 is capable of detecting the gas concentration of hydrogen permeable structure 84 .

The hydrogen meter 8 may also include an inner sleeve 831 and an outer sleeve 832 located radially outside the inner sleeve 831 . The hydrogen permeation structure 84 is located inside the inner sleeve 831 , and the inner sleeve 831 defines a measurement chamber 83 . The liquid metal enters the inner casing 831 from the annular gap between the inner casing 831 and the outer casing 832, flows through the hydrogen permeation structure 84, and then flows out.

The hydrogen meter 8 may also include an electromagnetic driving device 81 for driving liquid metal to flow into and out of the measurement chamber 83 . The hydrogen meter 8 may also include a heating device 82 for heating the liquid metal to detect the hydrogen concentration in the liquid metal at different temperatures. The liquid metal may be liquid sodium, for example. In some embodiments, the hydrogen meter 8 may also include a thermocouple for detecting the temperature of the hydrogen permeation structure 84 .

As shown in FIG. 2 , it shows a schematic principle diagram of a calibration device provided by an embodiment of the present application. The device may include: a liquid alkali metal circuit 10 , a hydrogen supply part 11 , a control part 12 and a processing part 13 .

The liquid alkali metal circuit 10 can be used to supply liquid alkali metal to flow, and the liquid alkali metal circuit 10 has a calibration interface 101 . The calibration interface 101 can be used to connect the measurement chamber 83 of the hydrogen meter 8 so that liquid alkali metal can enter the measurement chamber 83 of the hydrogen meter 8 .

The hydrogen supply part 11 may be used to supply hydrogen-containing gas into the liquid alkali metal circuit 10 to form a hydrogen-containing alkali metal liquid containing a hydrogen-containing compound.

The control part 12 can be electrically connected to the hydrogen meter 8, and the control part 12 can be used to control the opening of the high vacuum system 85 of hydrogen, so that the hydrogen and other gases in the liquid alkali metal entering the measurement chamber 83 enter the hydrogen permeation structure 84, and The mass spectrometer 87 is controlled to detect the gas composition entering the hydrogen permeation structure 84, and the ion pump 86 is controlled to detect the gas concentration entering the hydrogen permeation structure 84.

The processing part 13 may be electrically connected to the hydrogen meter 8 , and the processing part 13 may be used to calibrate the gas concentration detected by the ion pump 86 according to the concentration of hydrogen in the liquid alkali metal circuit 10 and the gas composition detected by the mass spectrometer 87 .

The calibration device provided by the embodiment of the present application can calibrate the gas concentration detected by the ion pump 86 according to the concentration of hydrogen in the liquid alkali metal circuit 10 and the gas composition detected by the mass spectrometer 87 , so that the calibrated hydrogen meter 8 can accurately The measurement results of hydrogen concentration are more accurate and reliable.

In some embodiments, the processing part 13 is also used to: determine the proportion of hydrogen in the gas entering the hydrogen permeation structure 84 based on the gas composition detected by the mass spectrometer 87 ; based on the proportion of hydrogen and the concentration of hydrogen in the liquid alkali metal circuit 10 concentration, calibrating the gas concentration detected by the ion pump 86.

In the embodiment of the present application, the calibration of the hydrogen meter 8 actually involves the calibration of the gas concentration detected by the ion pump 86 . It is easy to understand that the data output by the ion pump 86 is a current value, and the current value includes the result of joint ionization of hydrogen and other impurity components. Embodiments of the present application calibrate the gas concentration detected by the ion pump 86 according to the concentration of hydrogen in the liquid alkali metal circuit 10 and the proportion of hydrogen in the gas entering the hydrogen permeation structure 84, so that the current value output by the ion pump 86 can be The part caused by hydrogen ionization corresponds to the concentration of hydrogen in the liquid alkali metal, thereby eliminating the influence of impurities, making the detection results of the calibrated hydrogen meter 8 more accurate and reliable.

For example, the concentration of hydrogen in the liquid alkali metal circuit 10 is A ppm/ml, and the gas composition detected by the mass spectrometer 87 is B ppm for hydrogen, C ppm for oxygen, and D ppm for nitrogen. It is determined through calculation that the concentration of hydrogen entering the hydrogen permeation structure 84 The proportion of hydrogen in the gas is B/(B+C+D). If the current value detected by the ion pump 86 is EμA, then E*B/(B+C+D)μA among the current values detected by the ion pump 86 is obtained by hydrogen ionization. The result of calibrating the gas concentration detected by the ion pump 86 is: the current value is E*B/(B+C+D)μA and the corresponding hydrogen concentration in the liquid alkali metal container 19 is A ppm/ml.

Referring to FIG. 2 , the calibration device provided by the embodiment of the present application may also include a cooling part 15 and an obstruction meter 14 . The cooling unit 15 may be used to cool the hydrogen-containing alkali metal liquid in the liquid alkali metal circuit 10 so that part of the hydrogen-containing compounds in the hydrogen-containing alkali metal liquid crystallizes and precipitates after cooling. The obstruction meter 14 can be used to obtain the crystallization temperature at which the hydrogen-containing compound in the hydrogen-containing alkali metal liquid crystallizes. The use of a blocking meter to obtain the crystallization temperature at which a hydrogen-containing compound in a hydrogen-containing alkali metal liquid is crystallized is well known to those skilled in the art and will not be described in detail here.

The processing unit 13 may also be connected to the obstruction meter 14 . The processing part 13 may be used to determine the saturated solubility value of the hydrogen-containing compound in the hydrogen-containing alkali metal liquid according to the crystallization temperature at which the hydrogen-containing compound crystallizes, thereby determining the saturated solubility value of the hydrogen-containing compound in the liquid alkali metal circuit 10 at the crystallization temperature. hydrogen concentration.

There is a corresponding relationship between the crystallization temperature of the hydrogen-containing compound crystallized out and the saturated solubility value of the hydrogen-containing compound in the hydrogen-containing alkali metal liquid. When the crystallization temperature is determined, the corresponding saturated solubility value of the hydrogen-containing compound is the determined value ( That is, the concentration of the hydrogen-containing compound in the alkali metal at the corresponding crystallization temperature can be determined), and then according to the saturated solubility of the hydrogen-containing compound, the concentration of hydrogen in the hydrogen-containing compound can be calculated, which is the hydrogen in the liquid alkali metal circuit 10 at the crystallization temperature concentration.

In the related art, the hydrogen concentration in the liquid alkali metal circuit 10 is calculated by supplying the hydrogen-containing gas content into the liquid alkali metal circuit 10 through a hydrogen supply unit. The inventor of the present application found that after hydrogen is injected into the liquid alkali metal circuit 10, it will not be uniformly dissolved in the liquid alkali metal, resulting in a large error in the calculated concentration of hydrogen in the liquid alkali metal circuit 10, resulting in a miscalculation of the hydrogen meter. The calibration of 8 is not accurate.

The calibration device of the embodiment of the present application uses the cooling part 15 to cool the hydrogen-containing alkali metal liquid in the liquid alkali metal circuit 10, so that part of the hydrogen-containing compounds in the hydrogen-containing alkali metal liquid crystallizes and precipitates after cooling, and then uses the obstruction The meter 14 obtains the crystallization temperature of the hydrogen-containing compound in the hydrogen-containing alkali metal liquid, so that the concentration of hydrogen in the liquid alkali metal circuit 10 can be obtained more accurately, and the hydrogen meter 8 can be calibrated more accurately.

In some embodiments, cooling section 15 may be a cold trap commonly used in sodium circuits. The cooling unit 15 may be provided on the liquid alkali metal circuit 10 . The obstruction meter 14 may be provided on the liquid alkali metal circuit 10 .

The pipelines in the liquid alkali metal circuit 10 can be covered with heating elements for heating the pipelines so that the temperature of the liquid metal in the liquid alkali metal circuit 10 can remain basically unchanged. For example, in actual work with liquid alkali metal The temperature range (such as the evaporator outlet temperature of a neutron reactor power station) is roughly the same, such as around 300℃-350℃. After the liquid alkali metal flows through the cooling part 15, the cooling part 15 cools the hydrogen-containing alkali metal liquid to a temperature below which the hydrogen-containing alkali metal liquid can crystallize (such as cooling to t1°C), thereby accurately obtaining the liquid alkali metal in the circuit. hydrogen concentration. After the liquid alkali metal comes out of the obstruction meter 14, the temperature can be heated to the initial temperature again by the obstruction meter 14 and/or the heating element wrapped around the pipeline. When the liquid alkali metal flows through the measurement chamber 83 of the hydrogen meter 8, the liquid alkali metal in the measurement chamber 83 is heated by the heating device 82 of the hydrogen meter 8 to the detection temperature range of the hydrogen meter 8 (the temperature range can be, for example, 450°C- 500°C), using the mass spectrometer 87 to detect the gas composition entering the hydrogen permeable structure, and using the ion pump 86 to detect the gas concentration entering the hydrogen permeable structure, and then based on the concentration of hydrogen in the liquid alkali metal circuit and the gas composition detected by the mass spectrometer 87 The gas concentration detected by the ion pump 86 is calibrated.

When performing the next calibration, the cooling part 15 can be used to cool the hydrogen-containing alkali metal liquid to t2°C, and t2°C is lower than t1°C, so as to cool the hydrogen-containing alkali metal liquid again to a temperature that enables the hydrogen-containing alkali metal liquid to crystallize. below, to obtain again exactly the current concentration of hydrogen in the liquid alkali metal circuit. After that, the ion pump 86 is used to detect the gas concentration entering the hydrogen permeation structure according to the above steps, and then the gas concentration detected by the ion pump 86 is calibrated according to the concentration of hydrogen in the liquid alkali metal circuit and the gas composition detected by the mass spectrometer 87 .

Referring to FIG. 2 , the calibration device provided by the embodiment of the present application may also include a buffer tank 16 and an inert gas supply part 17 . The buffer tank 16 may be provided on the liquid alkali metal circuit 10 . The inert gas supply part 17 is used to supply inert gas into the buffer tank 16 to stabilize the pressure in the liquid alkali metal circuit 10 . The buffer tank 16 can supplement and absorb the volume changes of the sodium medium in the test facility due to thermal expansion and contraction, so as to stabilize the operating pressure of the test facility.

In some embodiments, the inert gas supply 17 is connected to the buffer tank 16 through a gas line 171 . The gas pipeline 171 is provided with a gas valve 1711 for controlling the connection between the gas pipeline 171 and the buffer tank 16 . The inert gas supply part 17 may be an argon gas bottle.

Referring to Figure 2, in some embodiments, the calibration device may also include a liquid alkali metal container 19. The liquid alkali metal container 19 may be used to store liquid alkali metal and may be used to supply liquid alkali metal to the liquid alkali metal circuit 10 .

In some embodiments, the calibration device may also include a heating element (not shown in the figure), and a temperature measuring element 25 can be provided in the liquid alkali metal container 19, and the temperature measuring element 25 can detect the temperature in the liquid alkali metal container 19, In order to control the temperature of the heating element, it is ensured that the liquid alkali metal in the liquid alkali metal container 19 will not solidify.

The inert gas supply part 17 can also be connected to the liquid alkali metal container 19 through a gas pipeline 172 to supply inert gas into the liquid alkali metal container 19 . The gas pipeline 172 is connected in parallel with the gas pipeline 171 and is connected to the inert gas supply part 17 .

The pipe section connecting the gas pipeline 172 and the liquid alkali metal container 19 may be provided with a valve 1722 for controlling the connection between the gas pipeline 172 and the liquid alkali metal container 19 .

A gas pipeline 173 may be provided between the gas pipeline 171 and the gas pipeline 172. The gas pipeline 173 is provided with a valve 1731 for controlling the on/off of the gas pipeline 173. The function of the gas pipeline 173 is to connect the buffer tank 16 with the gas chamber of the liquid alkali metal container 19 after the calibration is completed, so as to facilitate the transfer of liquid alkali metal into the liquid alkali metal container 19 . When the liquid alkali metal is sodium, the liquid alkali metal container 19 is a sodium storage tank.

The gas pipeline 172 may also be provided with a valve 1721 , and the valve 1721 is located between the gas pipeline 173 and the gas pipeline 171 .

In some embodiments, the calibration device may also include an electromagnetic pump 18 . The electromagnetic pump 18 can be used to drive the flow of liquid alkali metal in the liquid alkali metal circuit 10 .

In some embodiments, the calibration device may further include a vacuum part 20 . The vacuum part 20 may be used to evacuate the liquid alkali metal circuit 10 before supplying the liquid alkali metal to the liquid alkali metal circuit 10 .

The vacuum part 20 may be connected to the liquid alkali metal container 19 through a gas pipeline 172 . A vacuum valve 201 may be provided between the vacuum part 20 and the gas pipeline 172 for controlling the connection between the vacuum part 20 and the gas pipeline 172 .

The liquid alkali metal circuit 10 includes a first pipeline 102 , a second pipeline 103 , a third pipeline 104 , a fourth pipeline 105 and a fifth pipeline 106 . The first pipeline 102 and the second pipeline 103 are connected through the fifth pipeline 106 , the second pipeline 103 and the fourth pipeline 105 are connected, and the fourth pipeline 105 and the third pipeline 104 are connected through the buffer tank 16 . The first pipeline 102 and the second pipeline 103 are also connected to the liquid alkali metal container 19 respectively, so that the liquid alkali metal container 19 supplies liquid alkali metal to the liquid alkali metal circuit 10 .

The first pipeline 102 is provided with a first pipeline valve 1021, the second pipeline 103 is provided with a second pipeline valve 1031, and the fifth pipeline 106 is provided with a fifth pipeline valve 1061. When the fifth pipeline valve 1061 is closed and the first pipeline valve 1021 and the second pipeline valve 1031 are opened, the first pipeline 102 and the second pipeline 103 are connected to the liquid alkali metal container 19; when the fifth pipeline valve 1061 is opened and the first pipeline valve 1021 and the second pipeline valve 1031 are closed, the first pipeline 102 and the second pipeline 103 are connected to the fifth pipeline 106 .

The first pipeline 102 may also be provided with a first pipeline electric valve 1022 and a first pipeline flow meter 1023.

Referring to Figure 2, in some embodiments, the calibration device may also include an air cooling part for taking away excess heat from the calibration device. The air cooler 22 is connected to the fourth pipeline 105 through an air cooling valve 221. The fourth pipeline 105 is also provided with a fourth pipeline valve 1051. The fourth pipeline valve 1051 and the air-cooling valve 221 are used together to control whether the liquid metal in the fourth pipeline 105 flows through the air-cooling part. The air cooling section may include a cooling fan 21 and an air cooler 22 for taking away excess heat in the liquid alkali metal circuit 10 . During the operation of the circuit, the electromagnetic pump 18 will generate heat, which needs to be taken away by the air cooling unit, otherwise the circuit temperature will continue to rise. By setting up the air cooling section and the buffer tank 16, the loop temperature, pressure and flow can be effectively controlled to ensure long-term stable operation of the calibration device.

Referring to Figure 2, in some embodiments, the calibration interface 101 and the electromagnetic pump 18 are disposed on the third pipeline 104. Two instruments 31 are respectively provided at the inlet and outlet of the electromagnetic pump 18 for measuring the pressure at the inlet and outlet of the electromagnetic pump 18 . The instrument 31 can be a pressure gauge or a differential pressure transmitter, and is mainly used to monitor the inlet and outlet pressure of the electromagnetic pump 18 . Since the pump groove of the electromagnetic pump 18 is the weak link of the system, monitoring the inlet and outlet pressure of the electromagnetic pump 18 can protect the electromagnetic pump 18 and other equipment pipelines in the system from being damaged due to overpressure; in addition, according to the pressure difference of the electromagnetic pump 18, The power of the electromagnetic pump is adjusted through the frequency converter, and the system flow is roughly adjusted to facilitate the system flow adjustment and control during operation.

The obstruction gauge 14 and the cooling part 15 may be disposed on the second pipeline 103 .

The second pipeline 103 is also provided with a second pipeline valve 1032, a second pipeline valve 1033 and a second pipeline flow meter 1034. Among them, the second pipeline valve 1031 is disposed close to the liquid alkali metal container 19 . The second pipeline valve 1032 is provided between the second pipeline valve 1031 and the second pipeline valve 1033 . The obstruction meter 14 is arranged in parallel with the pipe section where the second pipeline valve 1033 is located through the obstruction pipeline. The obstruction pipeline is provided with obstruction meter valve 142 and obstruction meter valve 141 on both sides of the inlet and outlet of the obstruction meter 14 respectively.

The cooling section 15 is provided in parallel with the pipe section where the second pipeline valve 1032 is located through a cooling pipeline. The cooling pipeline is respectively provided with a cooling valve 152 and a cooling valve 151 on both sides of the inlet and outlet of the cooling section 15 .

Before calibration, the electromagnetic pump 18 drives the liquid alkali metal to flow from the liquid alkali metal container 19 into the liquid alkali metal circuit 10 . When the liquid alkali metal needs to be purified, the liquid alkali metal in the second pipeline 103 can be made to flow through the cooling part 15, and then the cooling part 15 can be used to purify the hydrogen-containing alkali in the liquid alkali metal circuit 10 and the liquid alkali metal container 19. The metal liquid is cooled, so that part of the hydrogen-containing compounds in the hydrogen-containing alkali metal liquid crystallizes and precipitates after cooling, thereby purifying and removing impurities from the liquid alkali metal.

During the calibration process, the electromagnetic pump 18 drives the liquid alkali metal to circulate in the liquid alkali metal circuit 10 . Specifically, the liquid alkali metal flows out of the first pipeline 102 and then flows into the second pipeline 103, and sequentially enters the cooling part 15 and the obstruction meter 14, and then enters the fourth pipeline 105, and enters the buffer tank 16 for buffering. The third pipeline 104 returns to the first pipeline 102 after flowing through the electromagnetic pump 18 .

The gas pipeline 171 can be connected with the buffer tank 16 at the upper part of the buffer tank 16, the fourth pipeline 105 can be connected with the buffer tank 16 at the lower part of the buffer tank 16, and the third pipeline 104 can be connected with the buffer tank 16 at the bottom of the buffer tank 16. .

In some embodiments, the hydrogen-containing gas provided by the hydrogen supply part 11 may be a mixed gas of hydrogen and argon. The hydrogen supply part 11 can be connected to the liquid alkali metal circuit 10 through a hydrogen pipeline 111 . The hydrogen pipeline 111 has a hydrogen interface 1111 , and the hydrogen interface 1111 is connected to the third pipeline 104 between the electromagnetic pump 18 and the buffer tank 16 . When calibrating the hydrogen meter 8, the hydrogen-containing gas in the hydrogen supply part 11 flows through the hydrogen pipeline 111 and enters the third pipeline 104 through the hydrogen interface 1111, and is injected into the liquid alkali metal in the third pipeline 104 to form a hydrogen-containing compound. Hydrogen-containing alkali metal liquid. In such an embodiment, it is equivalent to hydrogen entering the liquid alkali metal circuit 10 downstream of the buffer tank 16, thereby helping to avoid the hydrogen entering the third pipeline 104 from diffusing into the buffer before being fully dissolved in the liquid alkali metal. Inside the tank 16.

The embodiment of the present application also provides a calibration method of a hydrogen meter.

As shown in FIG. 3 , it shows a schematic flow chart of the calibration method of a hydrogen meter according to an embodiment of the present application. The hydrogen meter may be the hydrogen meter 8 mentioned above. The calibration method may include the following steps S31 to S37.

Step S31: Provide a liquid alkali metal circuit for flowing the liquid alkali metal.

Step S32: Inject hydrogen-containing gas into the liquid alkali metal circuit to form a hydrogen-containing alkali metal liquid containing a hydrogen-containing compound.

Step S33: Determine the concentration of hydrogen in the liquid alkali metal circuit.

Step S34: Use the high vacuum system 85 to permeate hydrogen and other gases in the hydrogen-containing alkali metal liquid into the hydrogen permeation structure 84.

Step S35: Use the mass spectrometer 87 to detect the gas composition entering the hydrogen permeation structure.

Step S36: Use the ion pump 86 to detect the gas concentration entering the hydrogen permeation structure.

Step S37: Calibrate the gas concentration detected by the ion pump 86 based on the concentration of hydrogen in the liquid alkali metal circuit and the gas composition detected by the mass spectrometer 87 .

The calibration method provided by the embodiment of the present application can calibrate the gas concentration detected by the ion pump 86 according to the concentration of hydrogen in the liquid alkali metal circuit and the gas composition detected by the mass spectrometer 87 , so that the calibrated hydrogen meter 8 can accurately measure the hydrogen The concentration measurement results are more accurate and reliable.

In some embodiments, the liquid alkali metal in step S31 may be liquid sodium. The hydrogen-containing compound in step S32 may be sodium hydroxide.

In some embodiments, step S33 of determining the concentration of hydrogen in the liquid alkali metal circuit may include: cooling the hydrogen-containing alkali metal liquid in the liquid alkali metal circuit so that part of the hydrogen-containing compounds in the hydrogen-containing alkali metal liquid Crystallization and precipitation after cooling; obtain the crystallization temperature at which the hydrogen-containing compound in the hydrogen-containing alkali metal liquid crystallizes and precipitates, determine the saturated solubility value of the hydrogen-containing compound in the hydrogen-containing alkali metal liquid according to the crystallization temperature, and determine it according to the saturated solubility value of the hydrogen-containing compound. The concentration of hydrogen in the liquid alkali metal circuit at the crystallization temperature.

There is a corresponding relationship between the crystallization temperature of the hydrogen-containing compound crystallized out and the saturated solubility value of the hydrogen-containing compound in the hydrogen-containing alkali metal liquid. When the crystallization temperature is determined, the corresponding saturated solubility value of the hydrogen-containing compound is the determined value ( That is, the concentration of the hydrogen-containing compound in the alkali metal at the corresponding crystallization temperature can be determined), and then based on the saturated solubility of the hydrogen-containing compound, the concentration of hydrogen in the hydrogen-containing compound can be calculated, which is the concentration of hydrogen in the liquid alkali metal circuit at the crystallization temperature. concentration.

In the related art, the concentration of hydrogen in the liquid alkali metal circuit is calculated by supplying the hydrogen-containing gas content into the liquid alkali metal circuit through a hydrogen supply unit. The inventor of the present application found that after hydrogen is injected into the liquid alkali metal circuit, it will not be uniformly dissolved in the liquid alkali metal, resulting in a large error in the calculated concentration of hydrogen in the alkali metal circuit, which leads to the calibration of the hydrogen meter 8 Inaccurate.

The calibration method of the embodiment of the present application cools the hydrogen-containing alkali metal liquid in the liquid alkali metal circuit 10 so that part of the hydrogen-containing compounds in the hydrogen-containing alkali metal liquid crystallizes and precipitates after cooling, and then the hydrogen-containing alkali metal is obtained. The crystallization temperature of the hydrogen-containing compound in the liquid crystallizes out, so that the concentration of hydrogen in the liquid alkali metal circuit can be obtained more accurately, and the hydrogen meter 8 can be calibrated more accurately.

The embodiment of the present application essentially uses the saturated solubility of hydrogen-containing impurities in alkali metals to calibrate the hydrogen meter 8 . Specifically, in the embodiments of the present application, hydrogen-containing gas is injected into the liquid alkali metal to form a hydrogen-containing alkali metal liquid containing hydrogen-containing compounds, and then the hydrogen-containing impurities are precipitated by cooling, so that the hydrogen in the liquid alkali metal is only Saturating dissolved hydrogen can eliminate the influence of hydrogen precipitation or uneven dissolution, so that the concentration of hydrogen in the liquid alkali metal circuit can be obtained more accurately.

It is easy to understand that saturated solubility is related to temperature and pressure. During the test, the temperature and pressure of the liquid alkali metal can be obtained to determine its saturated solubility.

In some embodiments, after determining the concentration of hydrogen in the liquid alkali metal circuit at the crystallization temperature, the calibration method may include the following steps: using a mass spectrometer 87 to detect the gas composition entering the hydrogen permeation structure 84 at the crystallization temperature, The ion pump 86 is used to detect the gas concentration entering the hydrogen permeability structure 84; based on the concentration of hydrogen in the liquid alkali metal circuit at the crystallization temperature and the gas composition detected by the mass spectrometer 87 at the crystallization temperature, the ion pump 86 detects the gas concentration at the crystallization temperature. The gas concentration is calibrated to obtain the calibration result of the hydrogen meter 8 at the crystallization temperature.

In some embodiments, when determining the concentration of hydrogen in the liquid alkali metal circuit 10, the cooling unit 15 can be used to cool down the hydrogen-containing alkali metal liquid in the liquid alkali metal circuit 10; the obstruction meter 14 can be used to obtain the hydrogen-containing alkali metal liquid. The crystallization temperature at which hydrogen-containing compounds crystallize out.

In some embodiments, after determining the concentration of hydrogen in the liquid alkali metal circuit at the crystallization temperature based on the saturated solubility value of the hydrogen-containing compound, the calibration method may further include the following step: measuring the liquid alkali metal circuit with a preset temperature gradient. Cool down the hydrogen-containing alkali metal liquid to obtain multiple different saturated solubility values corresponding to the hydrogen-containing compounds in the hydrogen-containing alkali metal liquid at different temperatures; determine the hydrogen in the liquid alkali metal circuit at different temperatures based on multiple different saturated solubility values The concentration at the temperature; at different temperatures of the hydrogen-containing alkali metal liquid, use the mass spectrometer 87 to detect the gas composition entering the hydrogen permeation structure 84, and use the ion pump 86 to detect the gas concentration entering the hydrogen permeation structure 84; according to the liquid alkali metal The concentration of hydrogen in the loop and the gas composition detected by the mass spectrometer 87 are calibrated to the gas concentration detected by the ion pump 86 to obtain the calibration results of the hydrogen meter 8 at different temperatures.

In the embodiment of the present application, the preset temperature gradient may be, for example, 0.5°C-5°C. For example, the preset temperature gradient may be 1°C or 2°C.

After calibrating the hydrogen meter at the current temperature t°C, the cooling part can be used to cool the liquid alkali metal in the liquid alkali metal circuit, so that the temperature of the liquid alkali metal drops by about 1°C. At this time, the content of the liquid alkali metal The hydrogen compound crystallizes further. Use an obstruction meter to obtain the current crystallization temperature, and further obtain the chemical solubility of the hydrogen-containing compound corresponding to the current crystallization temperature.

In the embodiment of the present application, hydrogen can be injected into the liquid alkali metal circuit once only at the beginning of the calibration. In the subsequent calibration process, the temperature of the liquid alkali metal is cooled to increase the solubility of the hydrogen-containing compound in the liquid alkali metal. Continue to decrease until it reaches a saturated state and then crystallization begins. At this time, the crystallization temperature can be obtained through a blocking meter, and the hydrogen meter 8 can be calibrated for the first time. After that, the liquid alkali metal is cooled with a certain temperature gradient, and then each time After cooling down, the obstruction meter can be used to obtain the corresponding crystallization temperature, so that the hydrogen meter 8 can be calibrated at the corresponding crystallization temperature.

It is easy to understand that the temperature of the liquid metal in the liquid alkali metal circuit can remain basically unchanged, for example, approximately the same as the temperature range of the liquid alkali metal in actual operation (such as the evaporator outlet temperature of a neutron reactor power station). After the cooling part is used to reduce the temperature of the liquid alkali metal to below the crystallization temperature, and after the obstruction meter obtains the current crystallization temperature, the temperature of the liquid metal in the liquid alkali metal circuit can be heated to the initial temperature again, so that it is at the initial temperature The liquid alkali metal flows into the measuring chamber 83 of the hydrogen meter 8 . The liquid alkali metal in the measurement chamber 83 is heated by the heating device 82 of the hydrogen meter 8 to the detection temperature range of the hydrogen meter 8 (the temperature range can be, for example, 450°C-500°C), and the mass spectrometer 87 is used to detect the gas entering the hydrogen permeation structure. The ion pump 86 is used to detect the gas concentration entering the hydrogen permeation structure, and then the gas concentration detected by the ion pump 86 is calibrated according to the concentration of hydrogen in the liquid alkali metal circuit and the gas composition detected by the mass spectrometer 87 .

It is easy to understand that when the hydrogen meter 8 is used for measurement, the temperature of the liquid alkali metal in the measurement chamber 83 increases due to being heated, but this basically does not affect the temperature of the liquid metal in the liquid alkali metal circuit.

During the next calibration, the cooling unit 15 can be used to cool the hydrogen-containing alkali metal liquid again based on the previous cooling. For example, if the temperature of the last cooling was t1°C, the temperature of this cooling is t2°C (t2<t1), and the temperature of the next cooling is t3°C (t3<t2), which is even lower.

In the embodiment of the present application, by lowering the temperature, the hydrogen-containing component impurities are cooled and precipitated, and the content of the hydrogen-containing component impurities in the liquid alkali metal is gradually reduced. This method of calibrating the hydrogen meter from high to low hydrogen concentration can make the calibration more accurate and make the measurement results of the calibrated hydrogen meter more accurate.

In some embodiments, calibrating the gas concentration detected by the ion pump 86 according to the concentration of hydrogen in the liquid alkali metal circuit and the gas composition detected by the mass spectrometer 87 may include: determining the hydrogen permeability according to the gas composition detected by the mass spectrometer 87 The proportion of hydrogen in the gas of structure 84; according to the proportion of hydrogen and the concentration of hydrogen in the liquid alkali metal circuit, the gas concentration detected by the ion pump 86 is calibrated.

In some embodiments, the liquid alkali metal circuit provided in the calibration method of the embodiment of the present application can be the liquid alkali metal circuit 10 in any calibration device of the present application. In some embodiments, the calibration method of the embodiment of the present application can be implemented using the calibration device of any embodiment of the present application.

The calibration method of this application will be described in detail below with reference to Figure 2 and specific embodiments.

Open each valve of the liquid alkali metal circuit 10, open the vacuum valve 201 and the valve 1722, and use the vacuum pump 20 to pump the liquid alkali metal circuit 10 to a vacuum environment; open the gas valve 1711 and the valve 1721, and pump the liquid alkali metal circuit to the liquid alkali metal circuit through the argon cylinder 17. Supply inert gas in 10 and repeat the above operation 3-4 times to drain the gas in the liquid alkali metal circuit 10; start the heating element to heat the liquid alkali metal circuit 10. In some embodiments, the design temperature of the liquid alkali metal circuit 10 may be 350°C, simulating the evaporator outlet temperature of a fast neutron reactor power plant.

The gas valve 1711 and the vacuum valve 201 are closed, and the inert gas is filled into the liquid alkali metal container 19 through the inert gas supply part 17 to increase the internal pressure of the liquid alkali metal container 19 .

Open the second pipeline valve 1031, the second pipeline valve 1032, the second pipeline valve 1033, the fourth pipeline valve 1051, the first pipeline valve 1021, and the first pipeline electric valve 1022 (close the liquid alkali metal circuit 10 other valves), the liquid alkali metal in the liquid alkali metal container 19 flows out to the second pipeline 103, and the liquid alkali metal flows into the buffer tank 16 along the second pipeline 103 and the fourth pipeline 105. When the buffer tank 16 When the liquid level of the liquid alkali metal reaches 2/3 of the buffer tank 16, stop pressurizing; start the electromagnetic pump 18 to make the liquid alkali metal flow to the calibration interface 101 along the third pipeline 104, so that the liquid alkali metal can pass through the calibration interface 101 flows into the measurement chamber 83 of the hydrogen meter 8 to be calibrated, and flows back to the liquid alkali metal container 19 through the first pipeline 102 . The pipe diameter of the liquid alkali metal loop 10 can be DN300, which is the same as the pipe diameter at the evaporator outlet of the fast neutron reactor power station; the flow rate of the liquid alkali metal in the loop can be 0.8m/s.

Open the fifth pipeline valve 1061, close the first pipeline valve 1021 and the second pipeline valve 1031, so that the liquid alkali metal circulates in the liquid alkali metal circuit 10.

A certain amount of hydrogen-containing gas is injected into the third pipeline 104 through the hydrogen supply part 11 and the hydrogen pipeline 111 . Open the cooling valve 151 and the cooling valve 152, open the obstruction meter valve 141 and the obstruction meter valve 142, close the second pipeline valve 1032, the second pipeline valve 1033, start the cold trap 15 to treat the hydrogen-containing alkali in the second pipeline 103 The metal liquid is cooled so that the hydrogen-containing compound in the alkali metal crystallizes out; the obstruction meter 14 is used to obtain the crystallization temperature at which the hydrogen-containing compound in the hydrogen-containing alkali metal liquid crystallizes out, so as to obtain the temperature of the hydrogen-containing compound in the hydrogen-containing alkali metal liquid The saturated solubility value corresponding to the current temperature. The concentration of hydrogen in the liquid alkali metal circuit 10 at the current temperature is determined according to the saturated solubility value corresponding to the current temperature.

Make the hydrogen meter 8 operate normally and stably and enter the measurement state. When the hydrogen meter 8 is operating normally, the preset nickel tube temperature can be 475°C, the frequency of the electromagnetic driving device 81 can be 20Hz, and the design pressure of the hydrogen meter can be 1.5MPa.

Start the high vacuum system 85 to evacuate the hydrogen permeation structure 84, and start the hydrogen meter heating device 82 to make the temperature of the hydrogen permeation structure 84 meet the requirements, so that the hydrogen molecules inside the measurement chamber 83 can enter the hydrogen through the peripheral wall of the hydrogen permeation structure 84. Penetrates inside the structure 84 and then enters the high vacuum system 85 through the vacuum pipeline. Test the current size of the ion pump 86 through the ion pump 86 in the high vacuum system 85 to determine the gas concentration entering the hydrogen permeation structure 84; test the gas composition through the mass spectrometer 87 in the high vacuum system 85, and according to the gas composition detected by the mass spectrometer 87 The proportion of hydrogen in the gas entering the hydrogen permeable structure 84 is determined.

According to the concentration of hydrogen in the liquid alkali metal circuit 10 and the gas composition detected by the mass spectrometer 87 , the gas concentration detected by the ion pump 86 is calibrated to obtain the calibration result of the hydrogen meter 8 at the current temperature.

After that, the cold trap 15 is used to cool down the hydrogen-containing alkali metal liquid in the second pipeline 103 again, so that the temperature of the alkali metal drops by about 1°C compared with the temperature when the cold trap 15 is used to cool down for the first time; and then the obstruction meter is used. 14 Obtain the crystallization temperature at which the hydrogen-containing compound in the hydrogen-containing alkali metal liquid crystallizes out, so as to obtain the saturated solubility value corresponding to the current temperature of the hydrogen-containing compound in the hydrogen-containing alkali metal liquid. Repeat the above process to achieve calibration of the hydrogen meter 8 under different hydrogen concentrations.

Regarding the embodiments of the present application, it should also be noted that, if there is no conflict, the embodiments of the present application and the features in the embodiments can be combined with each other to obtain new embodiments.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited thereto. The protection scope of the present application shall be subject to the protection scope of the claims.

Claims (10)

1. A method of calibrating a hydrogen meter comprising a measurement chamber for receiving a hydrogen-containing alkali metal liquid, a hydrogen permeation structure positioned within the measurement chamber, a mass spectrometer, and a high vacuum system comprising an ion pump for providing a high vacuum environment for the hydrogen permeation structure to permeate hydrogen in the hydrogen-containing alkali metal liquid into the hydrogen permeation structure, wherein the method comprises:

Providing a liquid alkali metal loop for flowing liquid alkali metal;

injecting a hydrogen-containing gas into the liquid alkali metal loop to form a hydrogen-containing alkali metal liquid comprising a hydrogen-containing compound;

determining the concentration of hydrogen in the liquid alkali metal loop;

penetrating hydrogen and other gases in the hydrogen-containing alkali metal liquid into the hydrogen-permeable structure using the high vacuum system;

detecting a gas constituent entering the hydrogen permeation structure using the mass spectrometer;

detecting a concentration of gas entering the hydrogen permeation structure using the ion pump;

and calibrating the gas concentration detected by the ion pump according to the concentration of hydrogen in the liquid alkali metal loop and the gas composition detected by the mass spectrometer.

2. The method of claim 1, wherein determining the concentration of hydrogen in the liquid alkali metal loop comprises:

cooling the hydrogen-containing alkali metal liquid in the liquid alkali metal loop to crystallize and separate out part of hydrogen-containing compounds in the hydrogen-containing alkali metal liquid after cooling;

obtaining a crystallization temperature at which the hydrogen-containing compound in the hydrogen-containing alkali metal liquid is crystallized and separated, determining a saturated solubility value of the hydrogen-containing compound in the hydrogen-containing alkali metal liquid according to the crystallization temperature, and determining the concentration of hydrogen in the liquid alkali metal loop at the crystallization temperature according to the saturated solubility value of the hydrogen-containing compound.

3. The method of claim 2, wherein the gas composition entering the hydrogen permeation structure is detected with the mass spectrometer and the concentration of the gas entering the hydrogen permeation structure is detected with the ion pump at the crystallization temperature;

calibrating the concentration of the gas detected by the ion pump at the crystallization temperature according to the concentration of hydrogen in the liquid alkali metal loop at the crystallization temperature and the gas composition detected by the mass spectrometer at the crystallization temperature to obtain a calibration result of the hydrogen meter at the crystallization temperature.

4. The method of claim 3, further comprising, after determining the concentration of hydrogen in the liquid alkali metal loop at the crystallization temperature from the saturated solubility value of the hydrogen-containing compound:

cooling the hydrogen-containing alkali metal liquid in the liquid alkali metal loop by a preset temperature gradient to obtain a plurality of different saturated solubility values of hydrogen-containing compounds in the hydrogen-containing alkali metal liquid at different temperatures;

determining the concentration of hydrogen in the liquid alkali metal loop at different temperatures from the plurality of different saturated solubility values;

Detecting the gas composition entering the hydrogen permeation structure by using the mass spectrometer at different temperatures of the hydrogen-containing alkali metal liquid, and detecting the concentration of the gas entering the hydrogen permeation structure by using the ion pump;

and calibrating the gas concentration detected by the ion pump according to the concentration of hydrogen in the liquid alkali metal loop and the gas composition detected by the mass spectrometer so as to obtain calibration results of the hydrogen meter at different temperatures.

5. The method of claim 2, wherein,

cooling the hydrogen-containing alkali metal liquid in the liquid alkali metal circuit with a cooling portion;

obtaining a crystallization temperature at which the hydrogen-containing compound in the hydrogen-containing alkali metal liquid is crystallized by using a blockage meter.

6. The method of claim 1, wherein the calibrating the ion pump detected gas concentration based on the concentration of hydrogen in the liquid alkali metal loop and the mass spectrometer detected gas composition comprises:

determining the proportion of hydrogen in the gas entering the hydrogen permeation structure according to the gas composition detected by the mass spectrometer;

and calibrating the gas concentration detected by the ion pump according to the proportion of the hydrogen and the concentration of the hydrogen in the liquid alkali metal loop.

7. A calibration apparatus for a hydrogen meter comprising a measurement chamber for receiving a hydrogen-containing alkali metal liquid, a hydrogen permeation structure positioned within the measurement chamber, a mass spectrometer, and a high vacuum system comprising an ion pump for providing a high vacuum environment for the hydrogen permeation structure to permeate hydrogen in the hydrogen-containing alkali metal liquid into the hydrogen permeation structure, wherein the calibration apparatus comprises:

a liquid alkali metal loop for flowing liquid alkali metal, the liquid alkali metal loop having a calibration interface for connecting to a measurement cavity of the hydrogen meter so that the liquid alkali metal can enter the measurement cavity of the hydrogen meter;

a hydrogen supply section for supplying a hydrogen-containing gas into the liquid alkali metal circuit to form a hydrogen-containing alkali metal liquid containing a hydrogen-containing compound;

a control part for controlling the high vacuum system of the hydrogen meter to be started so as to enable hydrogen and other gases in the liquid alkali metal entering the measuring cavity to enter the hydrogen permeation structure, controlling the mass spectrometer to detect the gas composition entering the hydrogen permeation structure, and controlling the ion pump to detect the concentration of the gas entering the hydrogen permeation structure; and

And the processing part is used for calibrating the gas concentration detected by the ion pump according to the concentration of hydrogen in the liquid alkali metal loop and the gas composition detected by the mass spectrometer.

8. The calibration device of claim 7, further comprising:

a cooling part for cooling the hydrogen-containing alkali metal liquid in the liquid alkali metal loop so as to crystallize and separate out part of hydrogen-containing compounds in the hydrogen-containing alkali metal liquid after cooling; and

a blocker for obtaining a crystallization temperature at which a hydrogen-containing compound in the hydrogen-containing alkali metal liquid is crystallized out;

the processing section is further configured to determine a saturated solubility value of a hydrogen-containing compound in the hydrogen-containing alkali metal liquid based on the crystallization temperature, and determine a concentration of hydrogen in the liquid alkali metal circuit at the crystallization temperature based on the saturated solubility value of the hydrogen-containing compound.

9. The calibration device of claim 7, wherein the processing section is further configured to:

determining the proportion of hydrogen in the gas entering the hydrogen permeation structure according to the gas composition detected by the mass spectrometer;

and calibrating the gas concentration detected by the ion pump according to the proportion of the hydrogen and the concentration of the hydrogen in the liquid alkali metal loop.

10. The calibration device of claim 7, further comprising:

the buffer tank is arranged on the liquid alkali metal loop;

an inert gas supply section for supplying an inert gas into the buffer tank to stabilize the pressure in the liquid alkali metal circuit; and/or the number of the groups of groups,

an electromagnetic pump for driving the flow of liquid alkali metal in the liquid alkali metal loop; and/or the number of the groups of groups,

a liquid alkali metal vessel for storing liquid alkali metal and supplying liquid alkali metal to the liquid alkali metal circuit; and/or the number of the groups of groups,

and the vacuum part is used for vacuumizing the liquid alkali metal loop before supplying the liquid alkali metal to the liquid alkali metal loop.