CN209747139U - Acousto-optic combined leakage monitoring system for main steam pipeline of nuclear power plant - Google Patents
Acousto-optic combined leakage monitoring system for main steam pipeline of nuclear power plant Download PDFInfo
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- CN209747139U CN209747139U CN201821492150.9U CN201821492150U CN209747139U CN 209747139 U CN209747139 U CN 209747139U CN 201821492150 U CN201821492150 U CN 201821492150U CN 209747139 U CN209747139 U CN 209747139U
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- main steam
- leakage monitoring
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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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Abstract
An object of the utility model is to disclose an acoustooptic combination leakage monitoring system for nuclear power plant main steam conduit, it includes acoustic emission leakage monitoring return circuit and spectrum leakage monitoring return circuit, the signal input part of acoustic emission leakage monitoring return circuit with the signal input part of spectrum leakage monitoring return circuit sets up respectively in the gauge point of main steam conduit, the signal output part of acoustic emission leakage monitoring return circuit with the signal output part of spectrum leakage monitoring return circuit passes through network switch intercommunication and connects, network switch connects gradually control unit and display element; compared with the prior art, the method has the advantages that early warning is made before the main steam pipeline leaks through the combination of acoustic emission and spectroscopy, so that the diversity and redundancy of the main steam pipeline leakage monitoring method are realized, and the monitoring result is more credible; the monitoring sensitivity is higher, the response time is faster, the reaction speed after leakage is found is obviously improved, and a larger safety margin is provided.
Description
Technical Field
The utility model relates to a leakage monitoring system, in particular to main steam conduit leakage monitoring system based on reputation combines.
Background
The application of the LBB (break-before-leak) criterion for the main steam pipeline in the design of a nuclear power plant requires that the nuclear power plant has a high pipeline leakage monitoring capability. The leakage monitoring system can be used for effectively finding the leakage of the pipeline in time and taking corresponding treatment measures within enough time, so that large crevasses caused by further expansion of pipeline cracks are avoided, and the main steam pipeline leakage monitoring requirement has positioning and quantifying capabilities.
At present, the main steam pipeline leakage monitoring technology commonly applied in the design of a nuclear power plant has long response time such as containment pit liquid level measurement and the like, and has poor positioning and quantification precision, so a leakage monitoring system needs to be added on the main steam pipeline using the LBB technology to meet the LBB requirement, and the diversity of the monitoring method is realized.
Therefore, there is a need for an acousto-optic combined leakage monitoring system for a main steam pipeline of a nuclear power plant to solve the existing problems.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a reputation combines leakage monitoring system for nuclear power plant main steam conduit, to the not enough of prior art, the stress variation of real-time supervision main steam conduit to accurately find out the leakage point fast and confirm to let out leakage quantity after the pipeline takes place to leak, thereby ensure nuclear power plant's safe operation.
The utility model provides a technical problem can adopt following technical scheme to realize:
The utility model provides an acousto-optic combination leakage monitoring system for nuclear power plant main steam conduit, its characterized in that, it includes acoustic emission leakage monitoring return circuit and spectrum leakage monitoring return circuit, the signal input part of acoustic emission leakage monitoring return circuit with the signal input part of spectrum leakage monitoring return circuit sets up respectively the gauge point of main steam conduit, the signal output part of acoustic emission leakage monitoring return circuit with the signal output part of spectrum leakage monitoring return circuit is through the intercommunication connection of network switch, network switch has connected gradually control unit and display element.
The utility model discloses an embodiment, acoustic emission leakage monitoring return circuit includes that a plurality of installs acoustic emission sensor, signal amplifier and the data acquisition unit around the main steam pipeline welding seam in the heat preservation, acoustic emission sensor passes through signal amplifier and data acquisition unit intercommunication and is connected.
Furthermore, the acoustic emission sensor, the signal amplifier and the data acquisition unit are in communication connection with each other through armored optical fibers.
further, the acoustic emission sensor comprises a waveguide rod, a piezoelectric crystal, a signal emitting device, a coupler, a signal wire and a cladding; the acoustic emission sensor is arranged around the welding line of the main steam pipeline in the heat-insulating layer, and transmits collected acoustic signals to the data collection unit through the armored optical fiber and the signal amplifier.
Furthermore, the signal amplifier is positioned between the acoustic emission sensor and the data acquisition unit and is used for amplifying the signal monitored by the acoustic emission sensor and transmitting the amplified signal to the data acquisition unit.
Furthermore, the data acquisition unit consists of a case, an acquisition card and an I/O card, and according to the measuring point area, the signal acquisition is completed by adopting an independent acquisition card, so that the safety of system operation is improved.
The utility model discloses an in one embodiment, spectrum leakage monitoring circuit includes miniature fiber optic probe, laser emitter and spectral analysis appearance around a plurality of main steam conduit welding seam in the heat preservation, miniature fiber optic probe passes through laser emitter and spectral analysis appearance intercommunication and is connected.
Furthermore, the miniature optical fiber probe, the laser emitter and the spectrum analyzer are in communication connection with each other through armored optical fibers.
Furthermore, the two ends of the micro optical fiber probe are optical fiber interfaces, the middle of the micro optical fiber probe is a hollow air chamber, surrounding air can freely pass through the hollow air chamber, and collimating lenses are arranged at the two ends of the hollow air chamber.
Furthermore, the armored optical fiber is a high-temperature-resistant and radiation-resistant stainless steel armored optical fiber, can be used for a long time at 400 ℃, and meets the requirement of the working environment in the containment.
Further, the laser emitter uses a near-infrared diode laser as a light source, and high-frequency narrow-band laser scanning is achieved near the characteristic absorption peak wavelength of water molecules by changing the temperature and the injection current of the laser.
Further, the spectrum analyzer comprises a laser transmitter, an analysis module and a signal output port; the spectrum analyzer is arranged outside the containment and is connected with the micro optical fiber probe in the containment through an armored optical fiber.
The utility model discloses a reputation combines leakage monitoring system for nuclear power plant main steam pipeline, compares with prior art, through the combination of acoustic emission and spectrum, realizes the variety and the redundancy of main steam pipeline leakage monitoring method, makes the monitoring result more credible, to gaseous state leakage steam's multiple measuring points direct monitoring under the containment environment, monitoring sensitivity is higher, response time is faster, promotes the reaction rate after discovering the leakage remarkably, provides bigger safety margin; judge main steam pipeline structural damage at the pipeline crack propagation stage, make the early warning before main steam pipeline leaks, realize the utility model discloses a purpose.
The features of the present invention will be apparent from the accompanying drawings and from the detailed description of the preferred embodiments which follows.
Drawings
FIG. 1 is a schematic structural view of the acousto-optic combined leakage monitoring system for the main steam pipeline of the nuclear power plant of the present invention;
Fig. 2 is the utility model discloses a flow diagram that is used for nuclear power plant main steam conduit's reputation to combine leakage monitoring system.
Detailed Description
In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand and understand, the present invention is further explained by combining with the specific drawings.
Examples
As shown in fig. 1 and fig. 2, the utility model discloses an acoustooptic for nuclear power plant main steam conduit combines leakage monitoring system, realize main steam conduit variety and redundant leakage monitoring that sets up, it includes acoustic emission leakage monitoring return circuit 10 and spectrum leakage monitoring return circuit 20, the signal input part of acoustic emission leakage monitoring return circuit 10 and the signal input part of spectrum leakage monitoring return circuit 20 set up respectively at main steam conduit 1's gauge point 2, the signal output part of acoustic emission leakage monitoring return circuit 10 and the signal output part of spectrum leakage monitoring return circuit 20 communicate each other through network switch 30 and connect, network switch 30 has connected gradually control unit 40 and display element 50.
In this embodiment, the acoustic emission leakage monitoring circuit 10 includes a plurality of acoustic emission sensors 11 installed around the weld of the main steam pipeline in the insulating layer, a signal amplifier 12 and a data acquisition unit 13, and the acoustic emission sensors 11 are in communication connection with the data acquisition unit 13 through the signal amplifier 12; the acoustic emission sensor 11, the signal amplifier 12 and the data acquisition unit 13 are in communication connection with each other through an armored optical fiber 14.
The armored optical fiber 14 is a high-temperature-resistant and radiation-resistant stainless steel armored optical fiber which can be used for a long time at 400 ℃, and meets the requirement of the working environment in the containment.
The acoustic emission sensor 11 comprises a waveguide rod, a piezoelectric crystal, a signal emitting device, a coupler, a signal wire and a cladding; the acoustic emission sensor 11 is installed around the weld of the main steam pipeline 1 in the heat-insulating layer, and transmits the collected acoustic signals to the data collection unit 13 through the armored optical fiber 14 and the signal amplifier 12.
The acoustic emission sensor 11 can detect ultrasonic signals with specific frequency in the process of generating cracks, crack propagation and pipeline fracture of the main steam pipeline, and the signals are amplified by the amplifier and then transmitted to the data acquisition unit 13 through the signal line, so that the leakage amount and the leakage position are monitored.
The acoustic emission sensor 11 is made of a piezoelectric ceramic material and can resist the environmental irradiation dose in the service life of a power plant. The acoustic emission sensor has a working frequency range of 50kHz-300kHz, has sensitivity greater than-70 dB, and can work for a long time in a high-temperature environment below 400 ℃.
The signal amplifier 12 is located between the acoustic emission sensor 11 and the data acquisition unit 13, and is configured to amplify the signal monitored by the acoustic emission sensor 11 and transmit the amplified signal to the data acquisition unit 13. The data acquisition unit 13 is composed of a case, an acquisition card and an I/O card, and according to the measuring point area, the signal acquisition is completed by adopting an independent acquisition card, so that the safety of system operation is improved.
In this embodiment, the spectrum leakage monitoring circuit 20 includes a plurality of micro fiber probes 21 around the main steam pipeline welding seam in the heat insulation layer, a laser emitter 22 and a spectrum analyzer 23, wherein the micro fiber probes 21 are connected with the spectrum analyzer 23 through the laser emitter 22 in a communication manner; the micro optical fiber probe 21, the laser emitter 22 and the spectrum analyzer 23 are connected with each other through armored optical fibers 24 in a communication mode.
The two ends of the micro optical fiber probe 21 are optical fiber interfaces, the middle part of the micro optical fiber probe is a hollow air chamber, surrounding gas can freely pass through the hollow air chamber, and collimating lenses are arranged at the two ends of the hollow air chamber. The main body material of the micro optical fiber probe 21 is 316SS, the lens is made of quartz, and the micro optical fiber probe can work in a high-temperature environment below 400 ℃ for a long time and meet the working requirement in a containment vessel of a nuclear power plant.
The armored optical fiber 24 is a high-temperature-resistant and radiation-resistant stainless steel armored optical fiber which can be used for a long time at 400 ℃ and meets the requirement of the working environment in the containment.
The laser emitter 22 uses a near-infrared diode laser as a light source, and the laser emitter 22 realizes high-frequency narrow-band laser scanning near 1575nm by changing temperature and injection current. The monitoring sensitivity of H2O at the wavelength can reach 1ppm per meter of optical path, the optical path of the miniature probe is about 20mm, the monitoring sensitivity is about 50ppm, namely the volume percentage content is 0.05%, and the monitoring upper limit is 50%.
The spectrum analyzer 23 comprises a laser emitter, an analysis module and a signal output port; the spectrum analyzer 23 is outside the containment and is connected to the in-containment miniature fiber optic probe 21 through a sheathed fiber 24.
The spectrum analyzer 23 is used for locking the gaseous water absorption peak by adopting a reference cell, qualitatively and quantitatively analyzing the gaseous water absorption peak signal, and the analyzer has no systematic drift and no calibration for the whole life. The spectrum analyzer 21 uses an optical fiber output laser, and the analyzer is configured into a multi-channel analyzer system, so that on-site multi-point simultaneous monitoring and real-time monitoring can be realized, and the response time is within 1 min.
The basic principles and the main features of the invention and the advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are intended to illustrate the principles of the invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined by the appended claims and their equivalents.
Claims (12)
1. The utility model provides an acousto-optic combination leakage monitoring system for nuclear power plant main steam conduit, its characterized in that, it includes acoustic emission leakage monitoring return circuit and spectrum leakage monitoring return circuit, the signal input part of acoustic emission leakage monitoring return circuit with the signal input part of spectrum leakage monitoring return circuit sets up respectively the gauge point of main steam conduit, the signal output part of acoustic emission leakage monitoring return circuit with the signal output part of spectrum leakage monitoring return circuit is through the intercommunication connection of network switch, network switch has connected gradually control unit and display element.
2. The acousto-optic combination leak monitoring system for a nuclear power plant main steam conduit according to claim 1, wherein the acoustic emission leak monitoring circuit includes a plurality of acoustic emission sensors, signal amplifiers and data acquisition units mounted around the weld of the main steam conduit within the insulation layer, the acoustic emission sensors being communicatively connected to the data acquisition units via the signal amplifiers.
3. The acousto-optic junction leakage monitoring system for a nuclear power plant main steam conduit according to claim 2, wherein the acoustic emission sensor, the signal amplifier and the data acquisition unit are communicatively connected to each other by armored optical fiber.
4. The acousto-optic combination leak monitoring system for a nuclear power plant main steam line of claim 2, wherein the acoustic emission sensor includes a waveguide rod, a piezoelectric crystal, a signal emitting device, a coupler, a signal wire and a cladding; the acoustic emission sensor is arranged around the welding line of the main steam pipeline in the heat-insulating layer, and transmits collected acoustic signals to the data collection unit through the armored optical fiber and the signal amplifier.
5. The acousto-optic combination leakage monitoring system for a nuclear power plant main steam pipeline according to claim 2, wherein the signal amplifier is located between the acoustic emission sensor and the data acquisition unit, and is configured to amplify the signal monitored by the acoustic emission sensor and transmit the amplified signal to the data acquisition unit.
6. The acousto-optic combination leakage monitoring system for a nuclear power plant main steam pipeline according to claim 2, wherein the data acquisition unit is comprised of a chassis, an acquisition card and an I/O card.
7. The acousto-optic combination leak monitoring system for a nuclear power plant main steam conduit according to claim 1, wherein the spectral leak monitoring circuit includes a plurality of miniature fiber optic probes, laser emitters and spectrum analyzers in the thermal insulation layer around the main steam conduit weld, the miniature fiber optic probes being communicatively connected to the spectrum analyzers via the laser emitters.
8. The acousto-optic junction leakage monitoring system for a nuclear power plant main steam pipeline according to claim 7, wherein the miniature fiber optic probe, the laser emitter and the spectrum analyzer are communicatively connected to each other by armored optical fibers.
9. The acousto-optic combination leakage monitoring system for the main steam pipeline of a nuclear power plant according to claim 7, wherein the micro fiber probe has fiber optic interfaces at both ends, a hollow air chamber in the middle, surrounding gas can freely pass through the hollow air chamber, and collimating lenses at both ends of the hollow air chamber.
10. The acousto-optic junction leakage monitoring system for a nuclear power plant main steam pipeline according to any of claims 3, 4 or 8, wherein the armored optical fiber is a high temperature and radiation resistant stainless steel armored optical fiber.
11. The acousto-optic combined leakage monitoring system for a nuclear power plant main steam pipeline according to claim 7, wherein the laser emitter uses a near-infrared diode laser as a light source, and high-frequency narrow-band laser scanning is achieved around the characteristic absorption peak wavelength of water molecules by changing the laser temperature and the injection current.
12. The acousto-optic junction leakage monitoring system for a nuclear power plant main steam line of claim 7, wherein said spectral analyzer includes a laser emitter, an analysis module and a signal output port; the spectrum analyzer is arranged outside the containment and is connected with the micro optical fiber probe in the containment through an armored optical fiber.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821492150.9U CN209747139U (en) | 2018-09-12 | 2018-09-12 | Acousto-optic combined leakage monitoring system for main steam pipeline of nuclear power plant |
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| CN201821492150.9U CN209747139U (en) | 2018-09-12 | 2018-09-12 | Acousto-optic combined leakage monitoring system for main steam pipeline of nuclear power plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109087720A (en) * | 2018-09-12 | 2018-12-25 | 上海核工程研究设计院有限公司 | A kind of acousto-optic combination leakage monitoring system for nuclear power plant's main steam line |
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2018
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109087720A (en) * | 2018-09-12 | 2018-12-25 | 上海核工程研究设计院有限公司 | A kind of acousto-optic combination leakage monitoring system for nuclear power plant's main steam line |
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Address after: No. 29 Hong Cao Road, Xuhui District, Shanghai Patentee after: Shanghai Nuclear Engineering Research and Design Institute Co.,Ltd. Address before: No. 29 Hong Cao Road, Xuhui District, Shanghai Patentee before: SHANGHAI NUCLEAR ENGINEERING RESEARCH & DESIGN INSTITUTE Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |