CN115326321A - Mutual inductance type liquid metal leakage monitoring device and application thereof - Google Patents
Mutual inductance type liquid metal leakage monitoring device and application thereof Download PDFInfo
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- CN115326321A CN115326321A CN202210917748.2A CN202210917748A CN115326321A CN 115326321 A CN115326321 A CN 115326321A CN 202210917748 A CN202210917748 A CN 202210917748A CN 115326321 A CN115326321 A CN 115326321A
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- liquid metal
- leakage monitoring
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/40—Investigating fluid-tightness of structures by using electric means, e.g. by observing electric discharges
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Examining Or Testing Airtightness (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
The invention discloses a mutual inductance type liquid metal leakage monitoring device and application thereof, wherein the mutual inductance type liquid metal leakage monitoring device comprises a detection sensor inserted into a leakage monitoring position; the detection sensor comprises a bendable pipe body, a probe assembly arranged at one end of the pipe body and a cable which is arranged in the pipe body in a penetrating way and is connected with the probe assembly; the probe assembly comprises a protective sleeve connected with the tube body, a coil framework arranged in the protective sleeve, and a primary coil and a secondary coil which are sequentially wound on the coil framework; and the joints of the primary coil and the secondary coil respectively penetrate through the coil frameworks to be connected with the cable. The mutual inductance type liquid metal leakage monitoring device is used for monitoring based on the electromagnetic induction principle, does not need to contact with a detected medium, avoids the problem of false triggering caused by impurity pollution, insulation aging and the like, and effectively reduces the false alarm rate; the method has the advantages of high reliability, high sensitivity and the like.
Description
Technical Field
The invention relates to the technical field of liquid metal leakage monitoring, in particular to a mutual inductance type liquid metal leakage monitoring device and application thereof.
Background
Liquid metal has characteristics such as density is big, the temperature is high, corrosivity is strong for metal parts such as metal pipeline, tank, flange and valve receive thermal ageing and corrode the influence more easily, and then lead to leaking. Part of liquid metal with active chemical properties, such as sodium, can be violently combusted when contacting with air, so that serious consequences are caused; meanwhile, in the liquid metal fast reactor, the liquid metal used for the primary loop coolant has high radioactivity, so that effective means is needed to monitor the leakage of the liquid metal.
For monitoring liquid metal leakage, a contact detector is mainly adopted at present. The contact type detector is based on the conductivity of liquid metal, gives an alarm when two lead wires for detection are short-circuited due to leaked liquid metal, and has mature and wide application in sodium-cooled fast reactors. The detector has the characteristics of small volume and flexible installation, and can be used for detecting the leakage of parts such as pipelines, pumps, containers, flanges and the like. However, because the diameter of the probe of the contact detector is very small (millimeter level), the contact detector is susceptible to the influences of factors such as impurity interference, insulation aging, bending and mistaken touch of the wire core, and the like, and the false alarm rate is high.
In addition, because the detector is in a high-temperature radiation environment, the probe of the detector is easy to oxidize, an oxide film is formed, the conductivity of the probe is reduced, and leakage cannot be monitored correctly. If the liquid metal does not adequately wet the electrodes, liquid metal leakage may not be detected in a timely manner. In some important monitoring positions with severe environment, higher requirements on the sensitivity and accuracy of the detector are required, and the diversified design of the detector needs to be considered, so that a new monitoring means needs to be provided to accurately monitor the leakage of the liquid metal.
Disclosure of Invention
The invention aims to provide a mutual inductance type liquid metal leakage monitoring device and application thereof.
The technical scheme adopted by the invention for solving the technical problems is as follows: a mutual inductance type liquid metal leakage monitoring device is provided, which comprises a detection sensor inserted into a leakage monitoring position;
the detection sensor comprises a bendable pipe body, a probe assembly arranged at one end part of the pipe body, and a cable which is arranged in the pipe body in a penetrating way and is connected with the probe assembly;
the probe assembly comprises a protective sleeve connected with the tube body, a coil framework arranged in the protective sleeve, and a primary coil and a secondary coil which are sequentially wound on the coil framework; and the joints of the primary coil and the secondary coil respectively penetrate through the coil frameworks to be connected with the cable.
Preferably, the outer diameter of the probe assembly is less than or equal to 26mm.
Preferably, a first annular step protruding from the end of the protective sleeve facing the tube body is provided, and an external thread is provided on the first annular step; the end part of the pipe body facing the protective sleeve is provided with a second protruding annular step, and the second annular step is provided with an internal thread matched with the external thread;
the first annular step and the second annular step are tightly connected through thread fit.
The cable positioning support structure is characterized in that a plurality of support structures which are arranged at intervals along the axial direction of the cable positioning support structure are arranged in the pipe body, and the support structures are connected between the inner wall surface of the pipe body and the outer peripheral surface of the cable to position and support the cable.
Preferably, the pipe body is a metal hose.
Preferably, the protective sleeve is made of high-temperature resistant non-magnetic stainless steel.
Preferably, the primary coil and the secondary coil are respectively formed by winding a stainless steel armored magnesium oxide insulated single-core nickel cable.
Preferably, the mutual inductance type liquid metal leakage monitoring device further comprises a guide cylinder arranged at the leakage monitoring position for inserting the detection sensor therein.
Preferably, the guide cylinder is a cylinder structure with one closed end and the other open end;
the probe assembly of the detection sensor is inserted into the closed end of the guide cylinder.
Preferably, the mutual inductance type liquid metal leakage monitoring device further comprises a monitoring instrument connected with the detection sensor; the monitoring instrument provides a stable alternating current power supply for the primary coil of the detection sensor and receives and processes signals output by the secondary coil.
Preferably, the leakage monitoring position comprises an interlayer gap of the double-layer container, a pipeline, a tank body, a box body, a connecting flange and a valve.
The invention also provides application of the mutual inductance type liquid metal leakage monitoring device, wherein the detection sensor is extended into an interlayer gap of a double-layer container filled with liquid metal.
The mutual inductance type liquid metal leakage monitoring device is used for monitoring based on the electromagnetic induction principle, does not need to contact with a detected medium, avoids the problem of false triggering caused by impurity pollution, insulation aging and the like, and effectively reduces the false alarm rate; the method has the advantages of high reliability, high sensitivity and the like.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic cross-sectional view of a mutual inductance type liquid metal leakage monitoring device on a double-layered container according to an embodiment of the present invention;
fig. 2 is a schematic cross-sectional view of a detection sensor in a mutual inductance type liquid metal leakage monitoring device according to an embodiment of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
Referring to fig. 1-2, a mutual inductance type liquid metal leakage monitoring device according to an embodiment of the present invention includes a detecting sensor 10, a guide cylinder 20, and a monitoring meter 30.
The probe sensor 10 is used in an insertion into a leak monitoring location. The guiding cylinder 20 is used to be disposed at the leakage monitoring position to provide a detection channel for the detection sensor 10, and at the same time, to isolate the detection sensor 10 from the medium to be detected (such as liquid metal), so as to prevent the medium to be detected from contacting the detection sensor 10 and polluting or corroding the detection sensor 10.
The monitoring meter 30 is connected to the detection sensor 10, supplies a stable ac power to the detection sensor 10, receives a signal output from the detection sensor 10, and determines whether or not a leak occurs at a leak-monitored location based on the signal. In the case where it is determined that there is a leak, an alarm may be issued.
The detection sensor 10 includes a tube 11, a probe assembly 12, and a cable 13. A probe assembly 12 is attached to one end of the tubular body 11 as a probe portion of the probe sensor 10. The cable 13 is inserted into the tube 11 and connected to the probe assembly 12. The end of the cable 13 remote from the probe assembly 12 may extend out of the body 11 for connection to a monitoring meter 30.
The tubular body 11 may be provided in different lengths depending on the leak monitoring location and with a bending capability enabling an arrangement in a curved path. The tubular body 11 is preferably a metal hose.
In order to position the cable 13 in the tube 11 and avoid movement or accumulation in the tube 11, a plurality of support structures 14 may be disposed in the tube 11 at intervals along the axial direction, and the support structures 14 are connected between the inner wall surface of the tube 11 and the outer circumferential surface of the cable 13 to position and support the cable 13.
Alternatively, the support structure 14 may be a ring-shaped bracket, a ring-shaped support sheet, or the like, the outer periphery of which is fixed on the inner wall surface of the tube body 11, and the central hole is penetrated by the cable 13 and is tightly fitted with the cable 13.
In the present invention, the probe assembly 12 includes a protective sheath 121 connected to the tubular body 11, a bobbin 122 disposed inside the protective sheath 121, and a primary coil 123 and a secondary coil 124 sequentially wound on the bobbin 122. The joints of the primary coil 123 and the secondary coil 124 respectively penetrate through the bobbin 122, and can be connected with the cable 13 through a conducting wire.
Specifically, the protective sleeve 121 is a cylindrical body with both ends open, and is axially connected to the end of the tube 11. As an alternative means of connection of the protective sleeve 121 to the tubular body 11, in the embodiment shown in fig. 2, the end of the protective sleeve 121 facing the tubular body 11 is provided with a first annular step 125 in relief, the first annular step 125 being provided with an external thread (not shown); a second protruding annular step 111 is arranged at the end of the pipe body 11 facing the protective sleeve 121, and an internal thread (not shown) matched with the external thread is arranged on the second annular step 111; the first annular step 125 and the second annular step 111 are tightly connected by screw-fitting, so that the connection of the protective sleeve 121 and the tubular body 11 in the axial direction is realized.
In other embodiments, the protective sleeve 121 and the tube 11 may be connected by means of a ferrule, a thread, a welding, an interference fit, or the like.
The bobbin 122 is tightly fitted in the protective cover 121, and is positioned and supported by the protective cover 121. As shown in fig. 2, the bobbin 122 may be an i-shaped bobbin, the primary coil 123 is tightly wound on the bobbin 122, the secondary coil 124 is tightly wound outside the primary coil 123, and both the primary coil 123 and the secondary coil 124 are located in a recess of the i-shaped bobbin.
In order to connect to the cable 13, a through hole (not shown) is provided in an end surface of the bobbin 122 facing the cable 13, and the joints of the primary coil 123 and the secondary coil 124 are connected to the cable 13 through the through holes, respectively.
In terms of material, the protective sheath 121 is made of high temperature resistant non-magnetic stainless steel, which ensures that the protective sheath 121 has high magnetic permeability, so as to minimize the magnetic loss rate in the protective sheath 121. The bobbin 122 is made of 304 stainless steel with high temperature resistance and weak magnetic conductivity. The primary coil 123 and the secondary coil 124 are respectively formed by winding a stainless steel armored magnesium oxide insulated single core nickel cable. The cable diameter of the primary coil 123 and the secondary coil 124 is preferably limited to within 1 mm.
Further, to facilitate the use of the probe sensor in confined environments, the probe assembly 12 is sized as small as possible to meet process and performance requirements, such as an outer diameter of the probe assembly 12 of less than or equal to 26mm, i.e., an outer diameter of the probe portion of the probe sensor 10 of less than or equal to 26mm.
The size of the coil bobbin 122, the number of coil layers and the number of turns of the primary coil 123 and the secondary coil 124, the length of the cable 13, the power frequency and the like can be adjusted according to the monitored environment so as to meet the requirements of different environments.
The guide cylinder 20 is a hard cylinder structure with one end closed and the other end open, and has certain structural strength. A hollow passage inside the guide cylinder 20 forms a detection passage for insertion of the detection sensor 10 therein. The guide cylinder 20 serves as a protective shell of the detection sensor 10, plays a role in guiding, positioning and isolating a detected medium (such as liquid metal) for the detection sensor 10, and can be set to different lengths according to a leakage monitoring position.
The guide cylinder 20 may be fixed or molded to the device in which the leak detection site is located, such as a container, a pipe, a valve, etc. The closed end of the guide cylinder 20 should be able to be placed at the monitoring point of the leak monitoring position.
When the probe sensor 10 is inserted into the guide cylinder 20, the probe assembly 12 is inserted from the open end of the guide cylinder 20 until the probe assembly 12 reaches the closed end of the guide cylinder 20. The inner diameter of the guide cylinder 20 is set to correspond to the outer diameter of the detection sensor 10, so that the outer diameter slightly larger than the outer diameter of the detection sensor 10 is set to be excellent, the detection sensor 10 can be conveniently and freely inserted and pulled out, the distance between a medium to be detected outside the guide cylinder 20 and the detection sensor 20 is reduced as much as possible, and the sensitivity and the detection accuracy of the detection sensor 10 are ensured.
The guide cylinder 20 may be a stainless steel cylinder, and is preferably made of a high temperature resistant non-magnetic stainless steel, and serves as a sealing boundary of the detection sensor 10 when liquid metal leaks, so as to prevent the detection sensor 10 from directly contacting the liquid metal.
In conjunction with the structural configuration of the probe assembly 12, the monitoring meter 30 provides a stable ac power source for the primary coil 123 of the probe sensor 10, and receives and processes the signal output by the secondary coil 124. Specifically, the monitoring instrument 30 is provided with a power conversion module and a CPU processing module, the power conversion module is used for providing a stable ac power supply for the primary coil 123, and the CPU processing module is mainly used for processing the signal output by the secondary coil 124, judging whether leakage occurs and outputting an alarm. In addition, the signal processing and threshold alarm functions can be realized by integrating a whole plant control system (DCS).
In the detection sensor 10, the tube 11 is bendable, so that the entire detection sensor 10 is designed to be bendable and freely inserted into and removed from the guide cylinder 20. The tubular body 11 meets structural strength requirements while having some bending capability to extend the probe assembly 12 to a monitoring location for detection in long distance, narrow and curved path environments. Under normal operating conditions, the detection sensor 10 continuously operates in an environment containing radiation and high temperature, and under the conditions that the performance of the detection sensor 10 is reduced or the detection sensor 10 is in failure due to long-term operation, and the like, the detection sensor 10 can be pulled out of the guide cylinder 20 for maintenance or replacement.
The mutual inductance type liquid metal leakage monitoring device is suitable for leakage monitoring positions including interlayer gaps of double-layer containers, pipelines, tank bodies, box bodies, connecting flanges, valves and the like.
The following description will be given taking as an example the application of the mutual inductance type liquid metal leakage monitoring device of the present invention to the double container 40.
As shown in fig. 1, according to the depth and curvature of the interlayer gap 41 of the double-layered container 40, the guide cylinder 20 is formed in the interlayer gap 41 when the double-layered container 40 is manufactured, the open end of the guide cylinder 20 corresponds to the opening of the interlayer gap 41, and the closed end of the guide cylinder 20 extends to the bottom of the double-layered container 40. The detection sensor 10 is extended into the interlayer gap 41 of the double container 40 until the probe assembly 12 reaches the closed end of the guide cylinder 20.
The cable 13 of the detection sensor 10 is connected to the monitoring meter 30. The monitoring meter 30 is started, and a stable alternating current power supply is provided for the detection sensor 10 through the monitoring meter 30. The probe assembly 12 of the probe sensor 10 is positioned in the interlayer gap 41 and is used for monitoring whether the liquid metal contained in the double-layer container 40 leaks into the interlayer gap 41. A high-frequency constant current source is applied to the primary coil 123, and an induced electromotive force is generated in the secondary coil 124 by an alternating magnetic flux. When a leakage of liquid metal occurs, the alternating magnetic flux generated by the primary coil 123 generates an eddy current in the liquid metal, a magnetic flux opposite to the main flux is generated, a net magnetic flux passing through the secondary coil 124 is reduced, and an electromotive force of the secondary coil 124 is lowered, so that whether a leakage occurs can be judged by measuring the electromotive force of the secondary coil 124. Namely: when the secondary coil 124 received by the monitoring meter 30 outputs a signal (electromotive force corresponding signal), the signal is processed to obtain the electromotive force of the secondary coil 124, and whether leakage occurs is judged from whether the electromotive force is reduced by comparing the electromotive forces. When the electromotive force is reduced, it indicates that liquid metal leakage occurs.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (12)
1. A mutual inductance type liquid metal leakage monitoring device comprising a detecting sensor for insertion into a leakage monitoring site;
the detection sensor comprises a bendable pipe body, a probe assembly arranged at one end of the pipe body and a cable which is arranged in the pipe body in a penetrating way and is connected with the probe assembly;
the probe assembly comprises a protective sleeve connected with the tube body, a coil framework arranged in the protective sleeve, and a primary coil and a secondary coil which are sequentially wound on the coil framework; and the joints of the primary coil and the secondary coil respectively penetrate through the coil frameworks to be connected with the cable.
2. The device of claim 1, wherein the probe assembly has an outer diameter of 26mm or less.
3. A device as claimed in claim 1, wherein the end of the protective sleeve facing the tubular body is provided with a first annular step projecting therefrom, the first annular step being provided with an external thread; a second protruding annular step is arranged at the end part, facing the protective sleeve, of the pipe body, and an internal thread matched with the external thread is arranged on the second annular step;
the first annular step and the second annular step are tightly connected through thread fit.
4. The device of claim 1, wherein the tube body has a plurality of support structures spaced axially along the tube body, the support structures being connected between an inner wall surface of the tube body and an outer circumferential surface of the cable for positioning and supporting the cable.
5. A device as claimed in claim 1, wherein said tube is a metal hose.
6. The device of claim 1, wherein the protective sheath is made of a high temperature non-magnetic stainless steel.
7. A mutual inductance type liquid metal leakage monitor according to claim 1, wherein said primary and secondary coils are respectively wound with a single core nickel cable insulated with stainless steel sheathed magnesium oxide.
8. A mutual inductance type liquid metal leakage monitoring device according to claim 1, further comprising a guide cylinder disposed at a leakage monitoring position for inserting said detecting sensor therein.
9. The device of claim 8, wherein the guiding cylinder is a cylinder structure with one end closed and the other end open;
the probe assembly of the detection sensor is inserted into the closed end of the guide cylinder.
10. A mutual inductance type liquid metal leakage monitoring device according to any one of claims 1 to 9, further comprising a monitoring instrument connected to said detecting sensor; the monitoring instrument provides a stable alternating current power supply for the primary coil of the detection sensor, and receives and processes signals output by the secondary coil.
11. A mutually inductive liquid metal leakage monitoring apparatus according to any one of claims 1 to 9, wherein the leakage monitoring location comprises a double vessel sandwich gap, a pipe, a tank, a connecting flange, a valve.
12. Use of an apparatus according to any one of claims 1 to 11 wherein the detection sensor is inserted into the gap between the layers of a double-layered container containing liquid metal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210917748.2A CN115326321A (en) | 2022-08-01 | 2022-08-01 | Mutual inductance type liquid metal leakage monitoring device and application thereof |
| PCT/CN2023/109413 WO2024027542A1 (en) | 2022-08-01 | 2023-07-26 | Mutual-induction type liquid metal leakage monitoring apparatus and use thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210917748.2A CN115326321A (en) | 2022-08-01 | 2022-08-01 | Mutual inductance type liquid metal leakage monitoring device and application thereof |
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| Publication Number | Publication Date |
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| CN115326321A true CN115326321A (en) | 2022-11-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210917748.2A Pending CN115326321A (en) | 2022-08-01 | 2022-08-01 | Mutual inductance type liquid metal leakage monitoring device and application thereof |
Country Status (2)
| Country | Link |
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| CN (1) | CN115326321A (en) |
| WO (1) | WO2024027542A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024027542A1 (en) * | 2022-08-01 | 2024-02-08 | 中广核研究院有限公司 | Mutual-induction type liquid metal leakage monitoring apparatus and use thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| GB1093224A (en) * | 1963-12-10 | 1967-11-29 | Atomic Energy Authority Uk | Liquid metal monitor |
| EP1229313A3 (en) * | 2001-02-02 | 2003-09-03 | Bdh Industries Inc. | System and method for measuring liquid metal level |
| CN201828671U (en) * | 2010-03-08 | 2011-05-11 | 胡晓剑 | Cable identifying probe |
| CN102903407B (en) * | 2012-10-15 | 2015-05-20 | 中广核检测技术有限公司 | Flexible eddy current testing probe for heat transfer pipe of steam generator of nuclear power plant |
| CN105212902B (en) * | 2014-10-22 | 2018-08-14 | 苏州亘科医疗科技有限公司 | Sensor Yarn guide component |
| CN105318935A (en) * | 2015-12-04 | 2016-02-10 | 中国原子能科学研究院 | Wide-range mutual-induction type liquid metal liquidometer |
| CN105352562A (en) * | 2015-12-04 | 2016-02-24 | 中国原子能科学研究院 | Induction type servo liquid metal liquid level measurement device and method |
| CN105717545B (en) * | 2016-02-22 | 2018-05-18 | 田志恒 | It whether there is the device of liquid metal in a kind of monitoring pipeline |
| FR3075959B1 (en) * | 2017-12-22 | 2019-11-22 | Commissariat A L'energie Atomique Et Aux Energies Alternatives | SYSTEM FOR DETECTING THE LEAKAGE OF AN ELECTRICITY CONDUCTIVE FLUID FROM AN ENVELOPE |
| CN109979738B (en) * | 2019-04-16 | 2024-05-31 | 大连世有电力科技有限公司 | Transformer temperature controller based on optical fiber temperature measurement |
| CN112944222A (en) * | 2021-03-30 | 2021-06-11 | 上海传输线研究所（中国电子科技集团公司第二十三研究所） | Sensor suitable for long-distance submarine pipeline leakage monitoring and monitoring method thereof |
| CN113576702A (en) * | 2021-08-04 | 2021-11-02 | 桂林市啄木鸟医疗器械有限公司 | Implant detector |
| CN115326321A (en) * | 2022-08-01 | 2022-11-11 | 中广核研究院有限公司 | Mutual inductance type liquid metal leakage monitoring device and application thereof |
-
2022
- 2022-08-01 CN CN202210917748.2A patent/CN115326321A/en active Pending
-
2023
- 2023-07-26 WO PCT/CN2023/109413 patent/WO2024027542A1/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024027542A1 (en) * | 2022-08-01 | 2024-02-08 | 中广核研究院有限公司 | Mutual-induction type liquid metal leakage monitoring apparatus and use thereof |
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| WO2024027542A1 (en) | 2024-02-08 |
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