Dissolved hydrogen measuring equipment and flow stabilizer thereof

Abstract

The utility model discloses a current stabilizer which comprises a shell with a current stabilizing cavity inside, the shell is provided with a drainage port for sampling liquid to enter the current stabilizing cavity and a diversion port for sampling liquid to be discharged out of the current stabilizing cavity, and the drainage port is communicated with the downstream of a loop sampling system of a nuclear power station. And the flow guide port is communicated with the upstream of the portable dissolved hydrogen measuring instrument. The flow stabilizer can effectively improve the manual detection precision of the dissolved hydrogen content in the loop system of the nuclear power station, avoids the adverse effect of the liquid flow change of the loop system on detection and sampling, and enables the corresponding manual detection result of the dissolved hydrogen content to be more accurate and reliable. The utility model further discloses dissolved hydrogen measuring equipment applying the flow stabilizer.

Description

Technical Field

[0001] The utility model relates to the technical field of supporting equipment for dissolved hydrogen measurement in nuclear power plant circuits, and particularly relates to a flow stabilizing device. The utility model also relates to a dissolved hydrogen measurement device applying the flow stabilizing device. Background Art

[0002] During the current operation of nuclear power plant circuits, hydrogen addition is usually adopted to inhibit the oxygen generated after water is irradiated by nuclear reactions, so as to ensure the smooth progress of relevant functional equipment and their corresponding chemical reactions.

[0003] Generally, the dissolved hydrogen content in the circuit is controlled within the range of 20 - 50 ml / kg. During actual operation, although on-line dissolved hydrogen detection instruments are arranged in the circuit system of the nuclear power plant to on-line monitor the dissolved hydrogen content in the circuit system, in order to ensure the stable operation of the equipment, it is still necessary to manually measure the dissolved hydrogen content at regular intervals, and compare the manual measurement results with the detection results of the on-line dissolved hydrogen detection instruments, so as to ensure that the dissolved hydrogen content in the circuit system is controlled within the reasonable range required by the chemical technical specifications.

[0004] Generally, for the above-mentioned manual measurement of the dissolved hydrogen content, it is usually implemented by staff operating a portable dissolved hydrogen detector. During measurement, the staff directly connects the sampling end of the portable dissolved hydrogen detector to the circuit to perform the measurement. After the measurement is completed, the portable dissolved hydrogen detector is disconnected from the circuit.

[0005] However, although the above-mentioned manual measurement operation process can meet the basic application requirements in the current field, the portable dissolved hydrogen detector used in it is extremely vulnerable to the influence of the sampling environment in the circuit during the measurement process. Especially, the flow rate of the sampling liquid is unstable, and the size of the liquid flow rate in the circuit changes frequently during the sampling process, which will affect the measurement results of the portable dissolved hydrogen detector, resulting in deviations in the manual measurement results of the dissolved hydrogen content in the circuit system, affecting the accuracy of the final detection data and the accuracy of data comparison, and causing adverse effects on the monitoring of the working conditions of relevant nuclear power plant circuits and the operation and maintenance of relevant equipment.

[0006] In view of this, how to optimize the manual detection accuracy of the dissolved hydrogen content in the nuclear power plant circuit system, avoid the adverse influence of the liquid flow rate change in the circuit system on the detection sampling, and make the corresponding manual detection results of the dissolved hydrogen content more accurate and reliable is an important technical problem that needs to be solved by those skilled in the art at present. Summary of the Utility Model

[0007] The purpose of the present utility model is to provide a flow stabilizing device, which can effectively improve the manual detection accuracy of the dissolved hydrogen content in the nuclear power plant loop system, avoid the adverse effects of the liquid flow change in the loop system on the detection sampling, and make the corresponding manual detection results of the dissolved hydrogen content more accurate and reliable. Another purpose of the present utility model is to provide a dissolved hydrogen measuring device applying the above flow stabilizing device.

[0008] To solve the above technical problems, the present utility model provides a flow stabilizing device, including a housing with a flow stabilizing cavity inside. The housing has a drainage port for sampling liquid to enter the flow stabilizing cavity and a diversion port for sampling liquid to discharge from the flow stabilizing cavity. The drainage port is connected to the downstream of the nuclear power plant loop sampling system, and the diversion port is connected to the upstream of the portable dissolved hydrogen measuring instrument.

[0009] Preferably, a sampling control valve capable of controlling the on-off of the flow stabilizing cavity is provided on the housing.

[0010] Preferably, the sampling control valve is located at the drainage port and / or the diversion port.

[0011] Preferably, it further includes a controller respectively communicatively connected to the sampling control valve and the portable dissolved hydrogen measuring instrument.

[0012] Preferably, it further includes a drainage conduit connected between the nuclear power plant loop sampling system and the drainage port and a diversion conduit connected between the diversion port and the portable dissolved hydrogen measuring instrument.

[0013] Preferably, both the drainage conduit and the diversion conduit are flexible hoses.

[0014] The present utility model also provides a dissolved hydrogen measuring device, including a portable dissolved hydrogen measuring instrument, and further including a flow stabilizing device connected to the upstream of the portable dissolved hydrogen measuring instrument. The flow stabilizing device is the flow stabilizing device described in any one of the above.

[0015] Preferably, the portable dissolved hydrogen measuring instrument has a sample inlet for sampling liquid to enter and a sample discharge port for sampling liquid to discharge. The sample inlet is connected to the downstream of the diversion port, and the sample discharge port is connected to the upstream of the nuclear island drain system of the nuclear power plant.

[0016] Preferably, it further includes a sample discharge pipe connected between the sample discharge port and the nuclear island drain system.

[0017] Preferably, the sample discharge pipe is a flexible hose.

[0018] Compared with the above background art, during the assembly, operation, and use of the flow stabilization device provided by the present utility model, the diversion port is connected and assembled in place with the sample inlet of the portable dissolved hydrogen measuring instrument. Then, the drainage port is connected to the loop sampling system of the nuclear power plant, so that the liquid in the loop sampling system enters the flow stabilization chamber through the drainage port as the sampling liquid for subsequent dissolved hydrogen content detection. These sampling liquids are effectively buffered and flow-stabilized in the flow stabilization chamber, and the sampling liquid processed by the flow stabilization chamber is passed into the portable dissolved hydrogen measuring instrument through the diversion port to complete the detection of the dissolved hydrogen content.

[0019] During this period, since the flow stabilization chamber can effectively perform flow stabilization and buffering on the sampling liquid, the sampling liquid can continuously and smoothly enter the portable dissolved hydrogen measuring instrument through the sampling port, effectively avoiding the measurement errors caused by unstable liquid flow and frequent flow rate changes when directly introducing the liquid flow in the loop sampling system of the nuclear power plant into the portable dissolved hydrogen measuring instrument for measurement in the prior art.

[0020] Therefore, the flow stabilization device effectively ensures the measurement accuracy and efficiency of the dissolved hydrogen in the sampling liquid by the portable dissolved hydrogen measuring instrument, and makes the comparison of the measurement data obtained after the measurement with the measurement data of the corresponding on-line dissolved hydrogen detector more accurate and reliable. The monitoring of the operation status of the relevant nuclear power plant loop system and the monitoring and maintenance of the supporting equipment are also optimized accordingly.

[0021] In another preferred solution of the present utility model, a sampling control valve capable of controlling the on-off of the flow stabilization chamber is provided on the housing. During equipment operation and use, the staff can control the conduction and cut-off of the flow stabilization chamber by adjusting the opening and closing of the sampling control valve, so as to disconnect the portable dissolved hydrogen measuring instrument from the loop sampling system of the nuclear power plant when not sampling or under other necessary circumstances, thereby meeting the disassembly, storage, transportation, inspection, maintenance, or replacement of corresponding component consumables of the portable dissolved hydrogen measuring instrument and its related supporting devices, and improving the operation convenience and operation efficiency of the flow stabilization device and its supporting portable dissolved hydrogen measuring instrument. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 It is a schematic diagram of the component layout structure of the dissolved hydrogen measuring equipment provided by a specific embodiment of the present utility model.

[0024] Wherein:

[0025] 10 - Portable dissolved hydrogen measuring instrument;

[0026] 101 - Sampling inlet;

[0027] 102 - Sampling outlet;

[0028] 103 - Sampling discharge pipe;

[0029] 11 - Housing;

[0030] 111 - Steady - flow chamber;

[0031] 112 - Drainage port;

[0032] 113 - Diversion port;

[0033] 12 - Sampling control valve;

[0034] 13 - Drainage catheter;

[0035] 14 - Diversion catheter;

[0036] 20 - Loop sampling system;

[0037] 30 - Nuclear island drain system. Detailed implementation manners

[0038] The core of the present utility model is to provide a steady - flow device, which can effectively improve the manual detection accuracy of the dissolved hydrogen content in the nuclear power plant loop system, avoid the adverse effects of the liquid flow change in the loop system on the detection sampling, and make the corresponding manual detection results of the dissolved hydrogen content more accurate and reliable; in addition, a dissolved hydrogen measuring device applying the above steady - flow device is also provided.

[0039] In order to enable those skilled in the art to better understand the solution of the present utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific implementation manners.

[0040] It should be noted in advance that in the present utility model, unless otherwise clearly defined and limited, the terms "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0041] In addition, in the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may include direct contact between the first and second features, or may include the first and second features not being in direct contact but in contact through additional features therebetween.

[0042] In addition, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "under", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature. The orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0043] Please refer to Figure 1 。

[0044] In the specific embodiment, the flow stabilizing device provided by the present utility model includes a housing 11 with a flow stabilizing cavity 111 inside. The housing 11 is provided with a diversion port 112 for allowing the sampling liquid to enter the flow stabilizing cavity 111 and a guiding port 113 for allowing the sampling liquid to discharge from the flow stabilizing cavity 111. The diversion port 112 is communicated with the downstream of the nuclear power plant loop sampling system 20, and the guiding port 113 is communicated with the upstream of the portable dissolved hydrogen measuring instrument 10.

[0045] During the assembly and operation process, the guiding port 113 is connected and assembled in place with the sample inlet 101 of the portable dissolved hydrogen measuring instrument 10. Then, the diversion port 112 is connected to the loop sampling system 20 of the nuclear power plant, so that the liquid in the loop sampling system 20 enters the flow stabilizing cavity 111 through the diversion port 112 as the sampling liquid for subsequent dissolved hydrogen content detection. These sampling liquids are effectively buffered and flow stabilized in the flow stabilizing cavity 111, and the sampling liquids processed by the flow stabilizing cavity 111 enter the portable dissolved hydrogen measuring instrument 10 through the guiding port 113 to complete the detection of the dissolved hydrogen content.

[0046] During this period, since the flow stabilizing cavity 111 can effectively perform flow stabilization and buffering on the sampling liquid, the sampling liquid can continuously and smoothly enter the portable dissolved hydrogen measuring instrument 10 through the sampling port, effectively avoiding the measurement error caused by unstable liquid flow and frequent flow rate changes in the prior art when directly introducing the liquid flow in the nuclear power plant loop sampling system 20 into the portable dissolved hydrogen measuring instrument 10 for measurement.

[0047] Thus, the flow stabilizing device effectively ensures the measurement accuracy and efficiency of the dissolved hydrogen in the sampling liquid by the portable dissolved hydrogen measuring instrument 10, and makes the comparison between the measurement data obtained after the measurement and the measurement data of the corresponding on-line dissolved hydrogen detector more accurate and reliable. The monitoring of the operation status of the relevant nuclear power plant loop system and the monitoring and maintenance of the supporting equipment are also optimized accordingly.

[0048] It is not difficult to understand that the inner diameter of the flow stabilizing cavity 111 is larger than the inner diameter of the upstream and downstream connecting pipelines of the flow stabilizing device. Only in this way can a sufficient accommodation space for sampling liquid buffering and flow stabilization be formed inside the flow stabilizing cavity 111 to ensure the sampling liquid diversion requirement of the downstream portable dissolved hydrogen measuring instrument 10. Generally, the cross-section of the flow stabilizing cavity 111 is circular. According to the actual working conditions and the layout of the assembly space, a flow stabilizing cavity 111 structure with a square, polygonal or other shaped cross-section can also be selected.

[0049] In addition, considering the assembly and use requirements under general working conditions and the processing and manufacturing difficulty of the main structural components of the flow stabilizing device, the flow stabilizing cavity 111 is preferably an equal-diameter chamber structure. However, if there are special application and supporting requirements under actual working conditions, the flow stabilizing cavity 111 can also be processed into a variable-diameter structure or a chamber structure with unconventional dimensions.

[0050] In practical applications, the staff can flexibly select and adjust the specific shape and size of the flow stabilizing cavity 111 according to the actual working conditions. In principle, as long as it can ensure the buffering and flow stabilizing effect on the sampling liquid and meet the supporting use and measurement requirements of the portable dissolved hydrogen measuring instrument 10, it is acceptable.

[0051] Furthermore, a sampling control valve 12 capable of controlling the on-off of the flow stabilizing cavity 111 is provided on the housing 11. When the equipment is operated, the staff can control the conduction and cut-off of the flow stabilizing cavity 111 by adjusting the opening and closing of the sampling control valve 12, so as to disconnect the portable dissolved hydrogen measuring instrument 10 from the loop sampling system 20 of the nuclear power plant during non-sampling detection or other necessary situations, thus meeting the disassembly, storage, transportation, inspection and maintenance of the portable dissolved hydrogen measuring instrument 10 and its related supporting devices, or the replacement of corresponding component consumables and other operations, and improving the operation convenience and operation efficiency of the flow stabilizing device and its supporting portable dissolved hydrogen measuring instrument 10.

[0052] Specifically, the sampling control valve 12 is located at the drainage port 112, so that the switch of the sampling control valve 12 can be used to control the flow interruption at the drainage port 112, so as to achieve the conduction or isolation between the steady flow chamber 111 and the nuclear power plant loop sampling system 20; or, the sampling control valve 12 can be arranged at the drainage port 113, so that the switch of the sampling control valve 12 can be used to control the flow interruption at the drainage port 113, so as to achieve the conduction or isolation between the steady flow chamber 111 and the portable dissolved hydrogen measuring instrument 10; furthermore, sampling control valves 12 can also be arranged at the drainage port 112 and the drainage port 113, respectively, so as to achieve the coordinated control of the flow interruption at the drainage port 112 and the drainage port 113 by adjusting the switch of the sampling control valve 12 at different positions, so as to meet the operation and use requirements under different working conditions, and improve the working condition adaptability and operation convenience of the flow stabilizing device.

[0053] On this basis, the flow stabilizing device further includes a controller that is respectively connected to the sampling control valve 12 and the portable dissolved hydrogen measuring instrument 10. Through the communication connection between the controller and each functional component, the start and stop of the portable dissolved hydrogen measuring instrument 10 and the on and off of the sampling control valve 12 can be controlled in a linked manner, thereby meeting the equipment operation requirements under different working conditions, and significantly improving the control accuracy and operating convenience of the flow stabilizing device, so that its working efficiency can be optimized accordingly.

[0054] In practical applications, the controller can be a single-chip microcomputer, or a computer, a mobile phone, or other operating terminals capable of realizing information feedback and communication control.

[0055] Generally, the controller can be integrated with the housing 11 or other main structural components of the flow stabilizing device, or can be separately arranged on the outside of the housing 11, or can be integrated with the main structure of the portable dissolved hydrogen measuring instrument 10. The staff can flexibly select and adjust the specific structural layout and assembly form of the controller and its related matching components according to the actual working conditions and equipment assembly space. In principle, any method can be used as long as it can meet the actual application needs of the flow stabilizing device.

[0056] In addition, the flow stabilizing device further includes a diversion conduit 13 connected between the sampling system 20 of the nuclear power plant loop and the diversion port 112, and a diversion conduit 14 connected between the diversion port 113 and the portable dissolved hydrogen measuring instrument 10. The diversion conduit 13 and the diversion conduit 14 can further optimize the liquid flow conduction efficiency between the sampling system 20 of the nuclear power plant loop and the flow stabilizing chamber 111, and between the flow stabilizing chamber 111 and the portable dissolved hydrogen measuring instrument 10, optimize the connection effect between the corresponding conduction components, and further improve the sampling liquid collection efficiency of the flow stabilizing device. Moreover, the diversion conduit 13 can perform preliminary buffering and moderate flow stabilization on the sampling liquid when the sampling liquid passes through the sampling system 20 of the nuclear power plant loop and enters the flow stabilizing chamber 111, thereby further reducing the liquid flow impact in the flow stabilizing chamber 111, further improving the liquid flow buffering treatment effect at the flow stabilizing chamber 111, making the corresponding flow stabilizing treatment more efficient, and further improving the measurement accuracy and measurement data accuracy of the dissolved hydrogen content of the sampling liquid at the portable dissolved hydrogen measuring instrument 10.

[0057] More specifically, both the diversion conduit 13 and the diversion conduit 14 are flexible hoses. The flexible hose structure is flexible and has strong adaptability to the assembly space, can fully meet the component assembly requirements under different working conditions, and further avoid rigid contact and structural impact between the diversion conduit 13 and the diversion conduit 14 and their related mating parts, and avoid structural damage to each pipe body and its related mating components, thereby further improving the assembly strength and structural reliability of the flow stabilizing device.

[0058] In a specific embodiment, the dissolved hydrogen measuring device provided by the present utility model includes a portable dissolved hydrogen measuring instrument 10, and further includes a flow stabilizing device connected upstream of the portable dissolved hydrogen measuring instrument 10, and the flow stabilizing device is the flow stabilizing device as described above. The flow stabilizing device of the dissolved hydrogen measuring device can effectively improve the manual detection accuracy of the dissolved hydrogen content in the nuclear power plant loop system, avoid the adverse effects of the liquid flow change in the loop system on the detection sampling, and make the corresponding manual detection results of the dissolved hydrogen content more accurate and reliable.

[0059] Furthermore, the portable dissolved hydrogen measuring instrument 10 has a sample inlet 101 for the sampling liquid to enter and a sample discharge port 102 for the sampling liquid to be discharged. The sample inlet 101 is connected to the downstream of the diversion port 113, and the sample discharge port 102 is connected to the upstream of the nuclear island drain system 30 of the nuclear power plant. The sample inlet 101 and the sample discharge port 102 can effectively improve the pipeline connection accuracy and liquid flow conduction efficiency between the portable dissolved hydrogen measuring instrument 10 and its upstream and downstream mating devices, thereby further improving the operation stability and component assembly reliability of the dissolved hydrogen measuring device.

[0060] On this basis, the dissolved hydrogen measurement device further includes a sampling pipe 103 connected between the sampling outlet 102 and the nuclear island drain system 30. The sampling pipe 103 can ensure that the liquid discharged through the sampling outlet 102 can be more smoothly introduced into the nuclear island drain system 30, thereby further improving the liquid flow conduction efficiency between the portable dissolved hydrogen meter 10 and the nuclear island drain system 30 of the nuclear power plant.

[0061] Correspondingly, the sampling pipe 103 is also a flexible hose. Similar to the above-described drainage conduit 13 and diversion conduit 14 which both adopt flexible hoses, the sampling pipe 103 here also uses a flexible hose, which can effectively avoid rigid contact and structural impact between the sampling pipe 103 and its related mating parts, and avoid structural damage to each pipe body and its related mating components, thereby further improving the assembly strength and structural reliability of the flow stabilizing device.

[0062] In summary, the flow stabilizing device provided in the present utility model includes a housing having a flow stabilizing cavity inside. The housing has a drainage port for allowing the sampling liquid to enter the flow stabilizing cavity and a diversion port for allowing the sampling liquid to discharge from the flow stabilizing cavity. The drainage port is connected to the downstream of the nuclear power plant loop sampling system, and the diversion port is connected to the upstream of the portable dissolved hydrogen meter.

[0063] During its assembly and operation, the diversion port is connected and assembled in place with the sample inlet of the portable dissolved hydrogen meter. Then, the drainage port is connected to the loop sampling system of the nuclear power plant, so that the liquid in the loop sampling system enters the flow stabilizing cavity through the drainage port as the sampling liquid for subsequent dissolved hydrogen content detection. These sampling liquids are effectively buffered and flow stabilized in the flow stabilizing cavity, and the sampling liquids processed by the flow stabilizing cavity are introduced into the portable dissolved hydrogen meter through the diversion port to complete the detection of the dissolved hydrogen content.

[0064] During this period, since the flow stabilizing cavity can effectively perform flow stabilization and buffering on the sampling liquid, the sampling liquid can continuously and smoothly enter the portable dissolved hydrogen meter through the sampling port, effectively avoiding the measurement errors caused by unstable liquid flow and frequent flow rate changes when directly introducing the liquid flow in the nuclear power plant loop sampling system into the portable dissolved hydrogen meter for measurement in the prior art.

[0065] Thereby, the flow stabilizing device effectively ensures the measurement accuracy and measurement efficiency of the portable dissolved hydrogen meter for the sampling liquid, and makes the comparison of the measurement data obtained after the measurement with the measurement data of the corresponding on-line dissolved hydrogen detector more accurate and reliable. The monitoring of the operating status of the relevant nuclear power plant loop system and the monitoring and maintenance of the supporting equipment are also correspondingly optimized.

[0066] The present utility model also provides a dissolved hydrogen measurement device, and its flow stabilizing device can effectively improve the manual detection accuracy of the dissolved hydrogen content in the nuclear power plant loop system, avoid the adverse effects of the liquid flow change in the loop system on the detection sampling, and make the corresponding manual detection results of the dissolved hydrogen content more accurate and reliable.

[0067] The above has introduced in detail the flow stabilizing device provided by the present utility model and the dissolved hydrogen measurement device applying the flow stabilizing device. Specific examples are used in this article to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and modifications can also be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

Claims

1. A steady flow device, characterized in that, It includes a housing with a flow-stabilizing cavity inside. The housing has a drainage port for the sampling liquid to enter the flow-stabilizing cavity and a diversion port for the sampling liquid to discharge from the flow-stabilizing cavity. The drainage port is connected to the downstream of the sampling system of the nuclear power plant loop, and the diversion port is connected to the upstream of the portable dissolved hydrogen measuring instrument.

2. The steady flow device according to claim 1, wherein, A sampling control valve capable of controlling the on-off of the flow-stabilizing cavity is provided on the housing.

3. The steady flow device according to claim 2, characterized in that, The sampling control valve is located at the drainage port and / or the diversion port.

4. The steady flow device according to claim 2, wherein It also includes a controller communicatively connected to the sampling control valve and the portable dissolved hydrogen measuring instrument respectively.

5. The steady flow device according to claim 1, characterized in that, It further includes a drainage conduit connected between the sampling system of the nuclear power plant loop and the drainage port, and a diversion conduit connected between the diversion port and the portable dissolved hydrogen measuring instrument.

6. The steady flow device according to claim 5, wherein Both the drainage conduit and the diversion conduit are flexible hoses.

7. A dissolved hydrogen measurement device, including a portable dissolved hydrogen measuring instrument, characterized in that, It also includes a flow-stabilizing device connected to the upstream of the portable dissolved hydrogen measuring instrument, and the flow-stabilizing device is the flow-stabilizing device according to any one of claims 1 to 6.

8. The dissolved hydrogen measurement device according to claim 7, characterized in that, The portable dissolved hydrogen measuring instrument has a sample inlet for the sampling liquid to enter and a sample discharge port for the sampling liquid to discharge. The sample inlet is connected to the downstream of the diversion port, and the sample discharge port is connected to the upstream of the nuclear island drainage system of the nuclear power plant.

9. The dissolved hydrogen measuring device according to claim 8, characterized in that, It further includes a sample discharge pipe connected between the sample discharge port and the nuclear island drainage system.

10. The dissolved hydrogen measuring device according to claim 9, characterized in that, The sample discharge pipe is a flexible hose.

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