Hydrogen-oxygen measuring device for nuclear power plant and hydrogen-oxygen concentration detection method

Abstract

This invention relates to a hydrogen and oxygen measuring device and a method for detecting hydrogen and oxygen concentrations in a nuclear power plant. The hydrogen and oxygen measuring device includes a base, a housing, a detection component, and a membrane component. The base has mounting holes. The housing is detachably connected to the base and has a accommodating cavity extending through it along its axial direction. The accommodating cavity communicates with the mounting holes and is filled with an electrolyte. The detection component is disposed within the accommodating cavity, with one end detachably mounted in the mounting holes. The detection component is used to detect either hydrogen or oxygen concentrations. The membrane component is detachably connected to the housing and can selectively allow hydrogen or oxygen molecules to pass through. The detection component and membrane component, with preset element content, can be replaced within the accommodating cavity according to detection requirements. The same nuclear power plant hydrogen and oxygen measuring device can be compatible with both hydrogen and oxygen concentration detection components and membrane components, improving detection efficiency and reducing detection costs.

Description

Technical Field

[0001] This invention relates to the field of dissolved hydrogen and oxygen measurement technology, and in particular to a hydrogen and oxygen measurement device and a method for detecting hydrogen and oxygen concentration in a nuclear power plant. Background Technology

[0002] Dissolved hydrogen and oxygen in water are crucial indicators for assessing the degree of water pollution. This is especially true in the nuclear power industry, where the measurement of hydrogen and oxygen in water is even more stringent. During pressurized water reactor (PWR) operation, the concentration of dissolved hydrogen in the primary coolant must be controlled within a specific range. An appropriate hydrogen concentration effectively inhibits irradiation decomposition of the primary coolant, prevents hydrogen embrittlement of the zirconium alloy cladding material for nuclear fuel assemblies, and prevents corrosion of the primary pressure boundary materials. During major overhauls of PWRs, forced oxidation of the primary coolant is required, necessitating monitoring of the dissolved oxygen concentration. Furthermore, dissolved oxygen concentrations in all anoxic water systems within nuclear power plants must be monitored, with portable oxygen meters used periodically on-site at a high frequency.

[0003] However, the hydrogen and oxygen sensor probes in related technologies are quite different and cannot be used interchangeably, resulting in inconvenient and costly detection. Summary of the Invention

[0004] Therefore, it is necessary to provide a hydrogen and oxygen measurement device for nuclear power plants to address the technical problems of inconvenient and costly detection of hydrogen and oxygen in related technologies.

[0005] A hydrogen and oxygen measuring device for a nuclear power plant, the device comprising:

[0006] The base has mounting holes;

[0007] The outer casing is detachably connected to the base. The outer casing has a receiving cavity that extends through the outer casing along its axial direction. The receiving cavity is connected to the mounting hole and is filled with electrolyte.

[0008] A detection component is disposed within the accommodating cavity, and one end of the detection component is detachably inserted into the mounting hole. The detection component is used to detect the concentration of hydrogen or the concentration of oxygen.

[0009] A membrane module, detachably connected to the housing, is selectively permeable to either hydrogen or oxygen molecules;

[0010] The detection component, which can be replaced with a preset element content according to the detection requirements, is placed in the accommodating cavity, and the membrane component that can pass through the preset element is connected to the outer shell.

[0011] In one embodiment, the detection component includes:

[0012] The support member has one end detachably connected to the mounting hole;

[0013] The working electrode is connected to the end of the support member that is away from the base;

[0014] A ring electrode is disposed around the working electrode and is insulated from the working electrode.

[0015] An auxiliary electrode is provided at one end around the periphery of the support member, and at the other end it tapers back and is electrically insulated from the end of the support member that is away from the working electrode.

[0016] In one embodiment, the detection component further includes:

[0017] A first insulating layer is disposed between the working electrode and the ring electrode, and the ring electrode is fixedly connected to the working electrode through the first insulating layer;

[0018] And / or, a second insulating layer, the second insulating layer being disposed between the auxiliary electrode and the support member, the auxiliary electrode being fixedly connected to the support member through the second insulating layer.

[0019] In one embodiment, the auxiliary electrode includes:

[0020] Multiple cup-shaped electrode sheets are sequentially nested and coaxial with the support member;

[0021] There is a gap between two adjacent cup-shaped electrode plates, and there is a gap between the innermost cup-shaped electrode plate and the support member.

[0022] In one embodiment, when the detection component is capable of detecting the concentration of hydrogen, the working electrode and the ring electrode are made of platinum, the auxiliary electrode is made of silver as a substrate, and a silver chloride layer is deposited on the surface of the substrate.

[0023] When the detection component is capable of detecting the oxygen concentration, the working electrode and the ring electrode are made of gold, and the auxiliary electrode is made of silver.

[0024] In one embodiment, the detection component includes:

[0025] A temperature sensing element is disposed within the support member and near one end of the working electrode.

[0026] In one embodiment, the membrane assembly includes:

[0027] A mounting base is detachably connected to the end of the housing opposite to the base.

[0028] A selectively permeable membrane is integrated onto the mounting base;

[0029] The selectively permeable membrane can selectively allow the hydrogen molecules or the oxygen molecules to pass through.

[0030] In one embodiment, the nuclear power plant hydrogen-oxygen measurement device further includes:

[0031] A sealing element is disposed in the mounting hole to seal the mounting hole, and one end of the support member passes through the sealing element;

[0032] Multiple leads are passed through the support member and electrically connected to the working electrode, the ring electrode and the auxiliary electrode;

[0033] A connector is provided at one end of the base away from the outer shell, and the end of the lead wire away from the working electrode is led out from the support and electrically connected to the connector.

[0034] A method for detecting hydrogen or oxygen concentration, wherein the method detects the concentration of hydrogen or oxygen using a nuclear power plant hydrogen or oxygen measuring device as described above, and the method includes the following steps:

[0035] Insert the detection component suitable for detecting the concentration of the preset element into the mounting hole of the base, and connect the membrane component that can transmit the preset element to the outer shell.

[0036] Connect the nuclear power plant hydrogen and oxygen measuring device to the test host, and place the end of the hydrogen and oxygen concentration detection device near the membrane module into the flow cell;

[0037] The concentration of hydrogen or oxygen can be calculated.

[0038] In one embodiment, the calculation of the hydrogen or oxygen concentration includes: calculating the hydrogen or oxygen concentration using the following formula:

[0039] The concentration of hydrogen or the concentration of oxygen are calculated using the following formula:

[0040] (1)

[0041] (2)

[0042] Where σ is the thickness of the selectively permeable membrane;

[0043] A s The surface area of ​​the working electrode;

[0044] D is the oxygen permeability coefficient or hydrogen permeability coefficient of the membrane module;

[0045] n is the number of electrons participating in the electrochemical reaction;

[0046] F is Faraday's constant;

[0047] C represents the concentration of hydrogen or oxygen;

[0048] I represents the current;

[0049] M is the molar mass;

[0050] T represents temperature;

[0051] I0 is the residual current of the working electrode when the hydrogen / oxygen concentration is 0;

[0052] A and a are both constants and are related to the material of the working electrode;

[0053] K is the Henry's constant for hydrogen / oxygen at the corresponding atmospheric pressure and temperature.

[0054] The beneficial effects of this invention are:

[0055] This invention provides a hydrogen and oxygen measuring device for nuclear power plants. The device includes a base, a housing, a detection component, and a membrane component. The base supports the housing, the detection component, and the membrane component. Mounting holes are provided on the base for detachable connection of the detection component. A receiving cavity is provided on the housing to house the detection component. An electrolyte is provided within the receiving cavity to provide a chemical reaction medium for detecting hydrogen or oxygen concentration. The detachable connection between the housing and the base allows for replacement of the appropriate detection component according to detection requirements. One end of the detection component is detachably mounted in the mounting hole on the base, allowing for selection of the appropriate detection component to connect to the base based on usage needs. The membrane component is detachably connected to the housing, and the membrane component can selectively allow hydrogen or oxygen molecules to permeate, allowing for connection of the appropriate membrane component to the housing as needed when detecting the concentration of a specific element. This structure allows for the placement of a detection component and membrane component suitable for a preset element content within the receiving cavity when element concentration detection is required, thereby enabling the detection of the corresponding element concentration. This allows the same nuclear power plant's hydrogen and oxygen measurement device to be compatible with the detection components and membrane modules that measure both hydrogen and oxygen concentrations. During testing, only the corresponding detection components and membrane modules need to be replaced, which not only improves testing efficiency but also reduces testing costs. Attached Figure Description

[0056] Figure 1 This is a schematic diagram of the internal structure of a hydrogen and oxygen measuring device for a nuclear power plant according to an embodiment of the present invention;

[0057] Figure 2This is a schematic flowchart of a hydrogen and oxygen concentration detection method provided in an embodiment of the present invention.

[0058] Figure label:

[0059] 100. Base; 200. Housing; 300. Detection component; 310. Support; 320. Working electrode; 330. Ring electrode; 340. Auxiliary electrode; 341. Cup-shaped electrode sheet; 350. First insulating layer; 360. Second insulating layer; 400. Membrane assembly; 410. Fixing base; 420. Selective permeable membrane; 430. Protective mesh; 500. Seal; 600. Lead wire; 700. Connector. Detailed Implementation

[0060] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0061] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0062] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0063] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0064] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0065] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0066] See Figure 1 An embodiment of the present invention provides a hydrogen and oxygen measuring device for a nuclear power plant. The device includes a base 100, a housing 200, a detection component 300, and a membrane component 400. The base 100 is provided with a mounting hole. The housing 200 is detachably connected to the base 100 and has a accommodating cavity that extends through the housing 200 along its axial direction. The accommodating cavity is connected to the mounting hole and is filled with an electrolyte. The detection component 300 is disposed in the accommodating cavity, and one end of the detection component 300 is detachably inserted into the mounting hole. The detection component 300 is used to detect the concentration of hydrogen or oxygen. The membrane component 400 is detachably connected to the housing 200 and can selectively allow hydrogen or oxygen molecules to pass through. The detection component 300, suitable for a preset element content, can be replaced and disposed in the accommodating cavity according to the detection requirements, and the membrane component 400 capable of passing through the preset element is connected to the housing.

[0067] This technical solution provides a hydrogen and oxygen measuring device for a nuclear power plant. The device includes a base 100, a housing 200, a detection component 300, and a membrane module 400. The base 100 supports the housing 200, the detection component 300, and the membrane module 400. Mounting holes are provided on the base 100 to allow for detachable connection of the detection component 300 to the mounting holes. A receiving cavity is provided on the housing 200 to house the detection component 300. An electrolyte is provided within the receiving cavity to provide a chemical reaction medium for detecting the concentration of hydrogen or oxygen. The detachable connection between the housing 200 and the base 100 allows for replacement of the appropriate detection component 300 according to detection requirements. One end of the detection component 300 is detachably mounted in a mounting hole on the base 100, allowing for selection of the appropriate detection component 300 to connect to the base 100 based on usage requirements. By detachably connecting the membrane module 400 to the housing 200, and by selectively allowing hydrogen or oxygen molecules to pass through the membrane module 400, the appropriate membrane module 400 can be connected to the housing 200 as needed when detecting the concentration of a corresponding element. With this structure, when it is necessary to detect the concentration of a corresponding element, the detection component 300 and membrane module 400 suitable for the preset element content can be placed in the receiving cavity, thereby realizing the detection of the corresponding element concentration. This allows the same nuclear power plant hydrogen and oxygen measurement device to be compatible with the detection components 300 and membrane modules 400 used to measure both hydrogen and oxygen concentrations. During detection, only the corresponding detection component 300 and membrane module 400 need to be replaced, which not only improves detection efficiency but also reduces detection costs.

[0068] It is understood that this embodiment provides a hydrogen and oxygen measurement device for nuclear power plants. When it is necessary to detect the hydrogen concentration, the detection component 300 capable of detecting the hydrogen concentration needs to be installed in the mounting hole of the base 100, and the membrane component 400 that allows hydrogen molecules to pass through needs to be connected to the outer casing 200. Correspondingly, when it is necessary to detect the oxygen concentration, the detection component 300 capable of detecting the oxygen concentration needs to be installed in the mounting hole of the base 100, and the membrane component 400 that allows oxygen molecules to pass through needs to be connected to the outer casing 200.

[0069] In this embodiment, the electrolyte in the hydrogen detection component 300 is a potassium chloride or hydrochloric acid solution, and the electrolyte in the oxygen detection component 300 is a potassium chloride or potassium hydroxide solution.

[0070] like Figure 1As shown, in one embodiment, the detection component 300 includes a support member 310, a working electrode 320, and a ring electrode 330. One end of the support member 310 is detachably connected to a mounting hole; the working electrode 320 is connected to the end of the support member 310 facing away from the base 100; the ring electrode 330 is arranged around the working electrode 320 and is insulated from the working electrode 320; one end of the auxiliary electrode 340 is arranged around the periphery of the support member 310, and the other end of the auxiliary electrode 340 is tapered and electrically insulated from the end of the support member 310 facing away from the working electrode 320.

[0071] In this embodiment, the ring electrode 330 does not participate in the electrochemical reaction; its main function is to remove impurity current between the working electrode 320 and the auxiliary electrode 340, thereby making the detection more accurate and reliable. An electrochemical reaction occurs between the working electrode 320 and the auxiliary electrode 340, facilitating the detection of the concentration of the corresponding element. The support member 310 supports the working electrode 320, the ring electrode 330, and the auxiliary electrode 340. By detachably connecting one end of the support member 310 to the mounting hole, the working electrode 320, the ring electrode 330, and the auxiliary electrode 340 are detachably connected to the base 100. When it is necessary to replace the corresponding detection component 300, simply install the support member 310 of the corresponding detection component 300 into the mounting hole on the base 100.

[0072] The working electrode 320 is configured as a disc-shaped structure, with one end threadedly connected to or bonded to the support member 310. In some embodiments, a protruding threaded step is provided at one end of the working electrode 320, and a threaded hole is provided at the end of the support member 310. The working electrode 320 and the support member 310 are fixedly connected by threading the threaded step on the working electrode 320 to the threaded hole on the support member 310. Further, a sealing ring is provided at the connection point between the working electrode 320 and the support member 310 to seal the support member 310 and prevent electrolyte from entering the interior of the support member 310. The end of the working electrode 320 facing away from the support member 310 is configured as an arc-shaped surface to increase the reaction area and thus improve detection accuracy. Specifically, the end face of the working electrode 320 facing away from the support member 310 is configured as an arc-shaped convex surface, which can significantly improve measurement accuracy and response speed. The ring electrode 330 has a circular structure and is sleeved outside the working electrode 320. The ring electrode 330 is used to remove impurity current between the working electrode 320 and the auxiliary electrode 340, thereby improving the measurement accuracy and stability of the sensor.

[0073] By insulating the switching electrode from the working electrode 320 and the auxiliary electrode 340 from the support member 310, the working electrode 320, the ring electrode 330 and the auxiliary electrode 340 are made independent of each other and do not interfere with each other.

[0074] Specifically, the detection assembly 300 further includes a first insulating layer 350 and / or a second insulating layer 360. The first insulating layer 350 is disposed between the working electrode 320 and the ring electrode 330, and the ring electrode 330 is fixedly connected to the working electrode 320 through the first insulating layer 350. The second insulating layer 360 is disposed between the auxiliary electrode 340 and the support member 310, and the auxiliary electrode 340 is fixedly connected to the support member 310 through the second insulating layer 360.

[0075] By providing a first insulating layer 350 between the working electrode 320 and the ring electrode 330, insulation between the working electrode 320 and the ring electrode 330 is achieved, and the first insulating layer 350 facilitates a fixed connection between the ring electrode 330 and the working electrode 320. Similarly, by providing a second insulating layer 360 between the auxiliary electrode 340 and the support member 310, insulation between the auxiliary electrode 340 and the support member 310 is achieved, and the fixed connection between the auxiliary electrode 340 and the support member 310 is also facilitated. Specifically, the first insulating layer 350 and the second insulating layer 360 can be any one of polyethylene, polypropylene, etc.

[0076] like Figure 1 As shown, in one embodiment, the auxiliary electrode 340 includes a plurality of cup-shaped electrode pieces 341, which are sequentially sleeved and coaxial with the support member 310. There is a gap between two adjacent cup-shaped electrode pieces 341, and there is a gap between the innermost cup-shaped electrode piece 341 and the support member 310.

[0077] By configuring the auxiliary electrode 340 as a series of nested annular electrode sheets, the surface area of ​​the auxiliary electrode 340 is increased, thereby increasing the chemical reaction area of ​​the auxiliary electrode 340. The cup-shaped electrode sheet 341 is configured coaxially with the support member 310. This ensures a more uniform and reliable chemical reaction around the support member 310, and simplifies the structure of the cup-shaped electrode sheet 341, facilitating its installation with the support member 310. In this embodiment, gaps are provided between adjacent cup-shaped electrode sheets 341 and between the cup-shaped electrode sheet 341 and the support member 310 to provide necessary space for the movement of electrons and ions during the chemical reaction. By configuring the cup-shaped electrode sheet 341 as described above, the electrochemical reaction rate can be significantly improved, increasing sensor lifespan and measurement accuracy.

[0078] In one embodiment, when the detection component 300 is capable of detecting the concentration of hydrogen, the working electrode 320 and the ring electrode 330 are made of platinum, and the auxiliary electrode 340 is made of silver as a substrate, with a silver chloride layer deposited on the substrate surface; when the detection component 300 is capable of detecting the concentration of oxygen, the working electrode 320 and the ring electrode 330 are made of gold, and the auxiliary electrode 340 is made of silver.

[0079] When the detection component 300 capable of detecting hydrogen concentration is installed on the base 100 and the housing, since the working electrode 320 and the ring electrode 330 are made of platinum, and the auxiliary electrode 340 is a silver substrate with a silver chloride layer deposited on its surface, the following reaction may occur on the working electrode 320 and the auxiliary electrode 340:

[0080] Working electrode 320 (platinum):

[0081] Auxiliary electrode 340 (silver / silver chloride):

[0082] The current value can be calculated by the number of electrons participating in the electrochemical reaction, and finally the hydrogen concentration can be calculated by the current value and the number of electrons.

[0083] When the detection component 300, capable of detecting oxygen concentration, is installed on the base 100 and the housing, since the working electrode 320 and the ring electrode 330 are made of gold and the auxiliary electrode 340 is made of silver, the following reaction may occur on the working electrode 320 and the auxiliary electrode 340:

[0084] Working electrode 320 (gold):

[0085] Auxiliary electrode 340 (silver):

[0086] The current value can be calculated by the number of electrons participating in the electrochemical reaction, and finally the oxygen concentration can be calculated by the current value and the number of electrons.

[0087] In one embodiment, the detection component 300 includes a temperature sensing element (not shown) disposed within the support 310 and near one end of the working electrode 320. Specifically, the temperature sensing element is an NTC (Negative Temperature Coefficient) thermistor temperature measurement circuit. The temperature sensing element is used to detect the temperature near the working electrode 320.

[0088] like Figure 1As shown, in one embodiment, the membrane assembly 400 includes a mounting base 410 and a selectively permeable membrane 420. The mounting base 410 is detachably connected to the end of the housing 200 away from the base 100. The selectively permeable membrane 420 is integrated on the mounting base 410. The selectively permeable membrane 420 can selectively permeate hydrogen molecules or oxygen molecules.

[0089] By integrating the selective permeable membrane 420 onto the mounting base 410, the selective permeable membrane 420 is supported by the mounting base 410. Furthermore, integrating the selective permeable membrane 420 onto the mounting base 410 improves the integration of the membrane assembly 400 and facilitates selective replacement. Specifically, the selective permeable membrane 420 can be any of the following: PFA membrane, Tefzel membrane, PTFE membrane, Halar membrane, PE membrane, etc., with a membrane thickness of 20µm-200µm.

[0090] Furthermore, a protective mesh 430 is provided on the side of the selectively permeable membrane 420 facing away from the working electrode 320 to protect the selectively permeable membrane 420.

[0091] The housing 200 is made of stainless steel, and the mounting base 410 and the housing 200 are connected by threads, allowing them to be detached. The auxiliary electrode 340 is also fixedly connected to the support 310 by threads.

[0092] like Figure 1 As shown, in one embodiment, the nuclear power plant hydrogen and oxygen measuring device further includes a sealing element 500, a plurality of leads 600, and a connector 700. The sealing element 500 is disposed in the mounting hole to seal the mounting hole, and one end of the support 310 passes through the sealing element 500. The plurality of leads 600 pass through the support 310 and are electrically connected to the working electrode 320, the ring electrode 330, and the auxiliary electrode 340. The connector 700 is disposed at one end of the base 100 away from the outer shell 200, and the end of the lead 600 away from the working electrode 320 is led out from the support 310 and electrically connected to the connector 700.

[0093] By installing a seal 500 inside the mounting hole, the mounting holes of the support 310 and the base 100 are sealed, thereby preventing electrolyte leakage from the mounting holes. Specifically, the seal 500 is an O-ring with a diameter of approximately 5mm-50mm, and can be a rubber seal, polyurethane seal, PTFE seal, graphite seal, metal seal, etc., with the appropriate material selected according to the usage environment. Leads 600 are used to achieve electrical connections between the working electrode 320 and the connector 700, the ring electrode 330 and the connector 700, the temperature sensing element and the connector 700, and the auxiliary electrode 340 and the connector 700.

[0094] Specifically, the support member 310 is provided with a through hole extending along the axial direction, and the lead wire 600 passes through the through hole. The end of the lead wire 600 near the working electrode 320 is connected to the working electrode 320, the auxiliary electrode 340, the ring electrode 330, and the temperature detection element, respectively; the end away from the working electrode 320 is connected to the connector 700. The connector 700 is an electrical signal plug used to connect to the test host.

[0095] See Figure 1 It is understood that the method of using the nuclear power plant hydrogen and oxygen measuring device provided in this embodiment of the invention is as follows:

[0096] Taking hydrogen measurement as an example, the assembled detection component 300 for detecting hydrogen concentration is installed onto the housing 200, and the membrane component 400 is installed onto the housing 200 with the protective mesh 430 facing down. The stainless steel housing 200 is filled with electrolyte, and then the base 100 is assembled with the stainless steel housing 200. Then, observe whether there are air bubbles at the selectively permeable membrane; if there are bubbles, electrolyte needs to be refilled. After assembly, connect the connector 700 to the testing host, and install the membrane component 400 end in a specially designed flow cell, through which water or gas is passed. The host calculates the hydrogen concentration by testing the thermocouple temperature and the current intensity between the three electrodes (working electrode 320, ring electrode 330, and auxiliary electrode 340).

[0097] An embodiment of the present invention also provides a method for detecting hydrogen and oxygen concentration. The method uses a nuclear power plant hydrogen and oxygen measuring device as described in any one of claims 1-8 to detect the concentration of hydrogen or oxygen. The method includes the following steps:

[0098] S100, Insert the detection component 300 suitable for detecting the concentration of a preset element into the mounting hole of the base 100, and connect the membrane component 400 that can transmit the preset element to the housing 200.

[0099] S200. Connect the nuclear power plant hydrogen and oxygen measuring device to the test host, and place the end of the hydrogen and oxygen concentration detection device near the membrane module 400 into the flow cell.

[0100] S300, calculates the concentration of hydrogen or oxygen.

[0101] In this embodiment, a detection component 300 capable of detecting the corresponding element is connected to the mounting hole of the base 100, and a membrane component 400 capable of transmitting the element molecules to be detected is connected to the outer shell 200, so that the element molecules to be detected can pass through the membrane component 400 into the receiving cavity, and thus be detected by the detection component 300. By connecting the nuclear power plant hydrogen and oxygen measuring device to the testing host, the testing host can calculate the parameters detected by the nuclear power plant hydrogen and oxygen measuring device to obtain the concentration of the corresponding element.

[0102] Specifically, the concentration of hydrogen or oxygen is calculated using the following formula:

[0103] (1)

[0104] (2)

[0105] Where σ is the thickness of the selectively permeable membrane 420;

[0106] As represents the surface area of ​​the working electrode 320;

[0107] D is the oxygen permeability or hydrogen permeability coefficient of membrane module 400;

[0108] n is the number of electrons participating in the electrochemical reaction;

[0109] F is Faraday's constant;

[0110] C represents the concentration of hydrogen or oxygen;

[0111] I represents the current;

[0112] M is the molar mass;

[0113] T represents temperature;

[0114] I0 is the residual current of the working electrode 320 when the hydrogen / oxygen concentration is 0;

[0115] A and a are both constants and are related to the material of the working electrode 320;

[0116] K is the Henry's constant for hydrogen / oxygen at the corresponding atmospheric pressure and temperature.

[0117] Specifically, the current value is calculated by the number of electrons, the surface area of ​​the working electrode 320, the film thickness, the oxygen permeability coefficient or the hydrogen permeability coefficient, the Faraday constant, and the molar mass, and then the concentration of hydrogen or oxygen is calculated from the current value.

[0118] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0119] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this invention patent should be determined by the appended claims.

Claims

1. A hydrogen and oxygen measuring device for a nuclear power plant, characterized in that, The nuclear power plant hydrogen and oxygen measurement device includes: The base has mounting holes; The outer casing is detachably connected to the base. The outer casing has a receiving cavity that extends through the outer casing along its axial direction. The receiving cavity is connected to the mounting hole and is filled with electrolyte. A detection component is disposed within the accommodating cavity, and one end of the detection component is detachably inserted into the mounting hole. The detection component is used to detect the concentration of hydrogen or oxygen. The detection component includes: a support, a working electrode, a ring electrode, an auxiliary electrode, a temperature detection component, a first insulating layer and / or a second insulating layer. One end of the support member is detachably connected to the mounting hole; The working electrode is connected to the end of the support member that is away from the base; The ring electrode is disposed outside the working electrode and is insulated from the working electrode; The auxiliary electrode includes multiple cup-shaped electrode pieces. One end of the auxiliary electrode is arranged around the periphery of the support member, and the other end is tapered and electrically insulated from the end of the support member opposite to the working electrode. The multiple cup-shaped electrode pieces are sequentially sleeved and coaxial with the support member. There is a gap between two adjacent cup-shaped electrode pieces, and there is a gap between the innermost cup-shaped electrode piece and the support member. The first insulating layer is disposed between the working electrode and the ring electrode, and the ring electrode is fixedly connected to the working electrode through the first insulating layer; The second insulating layer is disposed between the auxiliary electrode and the support member, and the auxiliary electrode is fixedly connected to the support member through the second insulating layer; The temperature sensing element is disposed inside the support member and near one end of the working electrode; A membrane module, detachably connected to the housing, is selectively permeable to either hydrogen or oxygen molecules; The detection component, which can be replaced with a preset element content according to the detection requirements, is placed in the accommodating cavity, and the membrane component that can pass through the preset element is connected to the outer shell.

2. The nuclear power plant hydrogen and oxygen measuring device according to claim 1, characterized in that, When the detection component is capable of detecting the concentration of hydrogen, the working electrode and the ring electrode are made of platinum, and the auxiliary electrode is made of silver as a substrate, with a silver chloride layer deposited on the surface of the substrate. When the detection component is capable of detecting the oxygen concentration, the working electrode and the ring electrode are made of gold, and the auxiliary electrode is made of silver.

3. The nuclear power plant hydrogen and oxygen measuring device according to any one of claims 1-2, characterized in that, The membrane assembly includes: A mounting base is detachably connected to the end of the housing opposite to the base. A selectively permeable membrane is integrated onto the mounting base; The selectively permeable membrane can selectively allow the hydrogen molecules or the oxygen molecules to pass through.

4. The nuclear power plant hydrogen and oxygen measuring device according to any one of claims 1-2, characterized in that, The nuclear power plant hydrogen and oxygen measurement device also includes: A sealing element is disposed in the mounting hole to seal the mounting hole, and one end of the support member passes through the sealing element; Multiple leads are passed through the support member and electrically connected to the working electrode, the ring electrode and the auxiliary electrode; A connector is provided at one end of the base away from the outer shell, and the end of the lead wire away from the working electrode is led out from the support and electrically connected to the connector.

5. A method for detecting hydrogen and oxygen concentration, characterized in that, The hydrogen and oxygen concentration detection method uses the nuclear power plant hydrogen and oxygen measuring device as described in any one of claims 1-4 to detect the concentration of hydrogen or oxygen, and the hydrogen and oxygen concentration detection method includes the following steps: Insert the detection component suitable for detecting the concentration of the preset element into the mounting hole of the base, and connect the membrane component that can transmit the preset element to the outer shell. Connect the nuclear power plant hydrogen and oxygen measuring device to the test host, and place the end of the nuclear power plant hydrogen and oxygen measuring device near the membrane module into the flow cell; The concentration of hydrogen or oxygen can be calculated.

6. The method for detecting hydrogen and oxygen concentration according to claim 5, characterized in that, The calculation of the hydrogen or oxygen concentration includes: calculating the hydrogen or oxygen concentration using the following formula: （1） （2） Where σ is the thickness of the selectively permeable membrane; A s A is the surface area of the working electrode; D is the oxygen permeability coefficient or hydrogen permeability coefficient of the membrane module; n is the number of electrons participating in the electrochemical reaction; F is Faraday's constant; C represents the concentration of hydrogen or oxygen; I represents the current; M is the molar mass; T represents temperature; I0 is the residual current of the working electrode when the hydrogen / oxygen concentration is 0; A and a are both constants and are related to the material of the working electrode; K is the Henry's constant for hydrogen / oxygen at the corresponding atmospheric pressure and temperature.

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