Nuclear power plant pipeline thermal fatigue monitoring system
阅读说明:本技术 核电厂管道热疲劳监测系统 (Nuclear power plant pipeline thermal fatigue monitoring system ) 是由 朱斌 赵岩 顾政 陈志林 陈忻 安英辉 薛飞 李晓蔚 王春辉 张彦召 余伟炜 于 2019-11-04 设计创作,主要内容包括:本发明公开了一种核电厂管道热疲劳监测系统,包括安装于安全壳内一回路管道上的疲劳监测传感器组件、安装于安全壳内的数据采集单元、安装于安全壳外的光电转换单元和监视与分析评估单元;所述疲劳监测传感器组件包括热电偶、套设在部分所述热电偶上的金属编织软管、将所述热电偶安装在管道上的安装支架以及将热电偶固定在所述安装支架上的滑块;所述数据采集单元包括环境传感器,所述数据采集单元用于接收疲劳监测传感器组件及环境传感器所测得的模拟信号,并将其转换为数字信号后输出;所述光电转换单元用于接收所述数字信号并将其转化为光信号,输送给监视与分析评估单元;所述监视与分析评估单元用于接收所述光信号并进行热疲劳的监视和分析评估。(The invention discloses a thermal fatigue monitoring system for a nuclear power plant pipeline, which comprises a fatigue monitoring sensor assembly, a data acquisition unit, a photoelectric conversion unit and a monitoring and analyzing and evaluating unit, wherein the fatigue monitoring sensor assembly is arranged on a loop pipeline in a containment vessel; the fatigue monitoring sensor assembly comprises a thermocouple, a metal braided hose sleeved on part of the thermocouple, a mounting bracket for mounting the thermocouple on a pipeline and a sliding block for fixing the thermocouple on the mounting bracket; the data acquisition unit comprises an environmental sensor and is used for receiving analog signals measured by the fatigue monitoring sensor assembly and the environmental sensor, converting the analog signals into digital signals and outputting the digital signals; the photoelectric conversion unit is used for receiving the digital signal, converting the digital signal into an optical signal and transmitting the optical signal to the monitoring and analyzing and evaluating unit; the monitoring and analyzing and evaluating unit is used for receiving the optical signal and carrying out monitoring and analyzing and evaluating of thermal fatigue.)
1. A thermal fatigue monitoring system for a nuclear power plant pipeline is characterized by comprising a fatigue monitoring sensor assembly, a data acquisition unit, a photoelectric conversion unit and a monitoring and analyzing and evaluating unit, wherein the fatigue monitoring sensor assembly is arranged on a loop pipeline in a containment vessel; the fatigue monitoring sensor assembly comprises a thermocouple, a metal braided hose sleeved on part of the thermocouple, a mounting bracket for mounting the thermocouple on a pipeline and a sliding block for fixing the thermocouple on the mounting bracket; the data acquisition unit comprises an environmental sensor and is used for receiving analog signals measured by the fatigue monitoring sensor assembly and the environmental sensor, converting the analog signals into digital signals and outputting the digital signals; the photoelectric conversion unit is used for receiving the digital signal, converting the digital signal into an optical signal and transmitting the optical signal to the monitoring and analyzing and evaluating unit; the monitoring and analyzing and evaluating unit is used for receiving the optical signal and carrying out monitoring and analyzing and evaluating of thermal fatigue.
2. The system for monitoring the thermal fatigue of the nuclear power plant pipeline according to claim 1, wherein the mounting bracket comprises a short connecting pipe connected with one end of the metal woven hose, a steel belt connected with the short connecting pipe and connecting buckles connected with two ends of the steel belt, the steel belt is provided with a through groove for accommodating the thermocouple, and the extending direction of the through groove is the same as the extending direction of the steel belt.
3. The system of claim 2, wherein the steel strip has a coefficient of thermal expansion that is the same as the coefficient of thermal expansion of the pipe to be tested.
4. The system for monitoring the thermal fatigue of the nuclear power plant pipeline according to claim 2, wherein the sliding block comprises a lower sliding block and a cover plate, an arc-shaped groove for the thermocouple to pass through is formed between the lower sliding block and the cover plate, a rectangular through hole for the steel belt to pass through and a circular through hole for the thermocouple probe to pass through are formed in the lower sliding block, the circular through hole passes through along the height direction of the lower sliding block, and the extending direction of the circular through hole is perpendicular to the extending direction of the rectangular through hole.
5. The system for monitoring the thermal fatigue of the nuclear power plant pipeline according to claim 4, wherein the lower sliding block and the cover plate are correspondingly provided with threaded holes, and the threaded holes extend downwards to the rectangular through hole.
6. The system for monitoring thermal fatigue of nuclear power plant pipelines according to claim 1, wherein the positive and negative conductors of the compensation cable are made of the same material as the thermocouple, and the non-metallic portion of the compensation cable can withstand a cumulative irradiation dose of at least 250 kGy.
7. The system of claim 1, wherein the data collection unit comprises a metal housing, and a data collection module, a power module, a network module, a storage module, the environmental sensor, and a first power carrier module disposed in the metal housing.
8. The system of claim 7, wherein the first power carrier module is configured to load the digital signal on an ac power and output the digital signal by an electrical penetration after analog signals measured by the fatigue monitoring sensor assembly and the environmental sensor are converted into digital signals.
9. The system for monitoring the thermal fatigue of the nuclear power plant pipeline according to claim 1, wherein a second power carrier module for analyzing the signal loaded on the alternating current into a digital signal again and a photoelectric conversion module for converting the digital signal into an optical signal are arranged inside the transmitting end of the photoelectric conversion unit; the receiving end is used for converting the optical signal into a digital signal and transmitting the digital signal to the monitoring and analyzing and evaluating unit.
10. The system for monitoring the thermal fatigue of the nuclear power plant pipeline according to claim 1, wherein the monitoring and analyzing and evaluating unit comprises a disk array, a server, a display and a switch, the disk array is used for storing and physically redundantly backing up the acquired data, the server is used for running thermal fatigue monitoring and thermal fatigue analyzing and evaluating software, and the display is used for displaying the result.
Technical Field
The invention belongs to the technical field of thermal fatigue monitoring of pipelines of nuclear power plants, and particularly relates to a thermal fatigue monitoring system suitable for an auxiliary pipeline of a primary circuit of an in-service nuclear power plant.
Background
Thermal fatigue is an important mechanism causing the crack of a primary loop pipeline of a nuclear power plant, and the mechanism is not completely considered in the initial design reference transient state, which brings great hidden trouble to the long-term safe operation of the nuclear power plant. With the continuous occurrence of a loop pipeline thermal fatigue event, the foreign nuclear power supervision organization gives enough attention in this respect: thermal fatigue monitoring and evaluation have been written into nuclear safety regulations in european countries such as germany, the NRC in the united states requires monitoring and evaluation of thermal fatigue damage by installing monitoring instruments in each nuclear power plant, and the nuclear safety agency in the country of china also proposes that attention must be paid to the thermal fatigue problem of the primary loop pipeline and requires effective management of the nuclear power plant. Therefore, the thermal fatigue monitoring technology is researched and developed aiming at the nuclear power plant pipeline, and the method has important significance for predicting and preventing the occurrence of thermal fatigue events.
In the existing mode, an original design sensor of a nuclear power plant is generally used for monitoring a transient state occurring in a primary loop pipeline, and a fatigue accumulation use factor is calculated by combining the maximum allowable transient occurrence number so as to evaluate the fatigue state of the primary loop pipeline. Since these sensors were not designed for monitoring thermal fatigue of the pipeline at the beginning, there are some obvious disadvantages in this way: (1) the positions of measuring points are few, no pertinence exists, and the thermal fatigue sensitive pipe sections and the positions cannot be covered; (2) the sensor is single-point type, and the thermal fatigue phenomena such as thermal stratification, thermal shock and the like cannot be monitored; (3) the amount of collected data is small, and detailed analysis and evaluation of fatigue are difficult to support.
Disclosure of Invention
In view of the above, in order to overcome the defects of the prior art, the present invention aims to provide a thermal fatigue monitoring system which can be applied to an auxiliary pipeline of a primary loop of an in-service nuclear power plant.
In order to achieve the purpose, the invention adopts the following technical scheme:
a thermal fatigue monitoring system for a nuclear power plant pipeline comprises a fatigue monitoring sensor assembly, a data acquisition unit, a photoelectric conversion unit and a monitoring and analyzing and evaluating unit, wherein the fatigue monitoring sensor assembly is arranged on a loop pipeline in a containment vessel; the fatigue monitoring sensor assembly comprises a thermocouple, a metal braided hose sleeved on part of the thermocouple, a mounting bracket for mounting the thermocouple on a pipeline and a sliding block for fixing the thermocouple on the mounting bracket; the data acquisition unit comprises an environmental sensor and is used for receiving analog signals measured by the fatigue monitoring sensor assembly and the environmental sensor, converting the analog signals into digital signals and outputting the digital signals; the photoelectric conversion unit is used for receiving the digital signal, converting the digital signal into an optical signal and transmitting the optical signal to the monitoring and analyzing and evaluating unit; the monitoring and analyzing and evaluating unit is used for receiving the optical signal and carrying out monitoring and analyzing and evaluating of thermal fatigue.
Preferably, the mounting bracket comprises a short connecting pipe connected with one end of the metal braided hose, a steel belt connected with the short connecting pipe and a connecting buckle connected with two ends of the steel belt, wherein a through groove for accommodating the thermocouple is formed in the steel belt, and the extending direction of the through groove is the same as the extending direction of the steel belt.
More preferably, the thermal expansion coefficient of the steel strip is the same as that of the pipe to be measured.
More preferably, the slider includes slider and apron down, be formed with the confession between slider and the apron down the arc wall that the thermocouple passed, offer on the slider down and be used for supplying the rectangle through-hole that the steel band runs through and supply the circular through-hole that the probe of thermocouple ran through, circular through-hole edge the direction of height of slider down runs through, the extending direction of circular through-hole is perpendicular with the extending direction of rectangle through-hole.
Further preferably, threaded holes are correspondingly formed in the lower sliding block and the cover plate, and the threaded holes extend downwards to the rectangular through holes.
Preferably, the positive and negative electrode conductors of the compensation cable are made of the same material as the thermocouple, and the non-metal part of the compensation cable can resist the accumulated irradiation dose of at least 250 kGy.
Preferably, the data acquisition unit comprises a metal shell, and a data acquisition module, a power module, a network module, a storage module, the environmental sensor and a first power carrier module which are arranged in the metal shell.
More preferably, after analog signals measured by the fatigue monitoring sensor assembly and the environmental sensor are converted into digital signals, the first power carrier module is configured to load the digital signals on alternating current and output the digital signals by an electrical penetration assembly.
Preferably, a second power carrier module for analyzing the signal loaded on the alternating current into a digital signal again and a photoelectric conversion module for converting the digital signal into an optical signal are arranged inside the transmitting end of the photoelectric conversion unit; the receiving end is used for converting the optical signal into a digital signal and transmitting the digital signal to the monitoring and analyzing and evaluating unit.
Preferably, the monitoring, analyzing and evaluating unit includes a disk array, a server, a display and a switch, the disk array is used for storing and physically redundantly backing up the collected data, the server is used for running thermal fatigue monitoring and thermal fatigue analyzing and evaluating software, and the display is used for displaying the result.
Compared with the prior art, the invention has the advantages that: the nuclear power plant pipeline thermal fatigue monitoring system measures temperature gradient data of fluid in a pipeline by mounting a fatigue monitoring sensor assembly on a loop pipeline, and the measured data is subjected to analog-to-digital conversion by a data acquisition unit, is transmitted to a photoelectric conversion unit and is subjected to photoelectric conversion, and then is provided for a monitoring and analysis evaluation unit to store and dynamically monitor.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of the overall structure of a thermal fatigue monitoring system for a nuclear power plant pipeline according to a preferred embodiment of the invention;
FIG. 2 is a schematic representation of the form of the sensor assembly for different measurement purposes in a preferred embodiment of the invention;
FIG. 3 is a schematic structural view of a fatigue monitoring sensor assembly in accordance with a preferred embodiment of the present invention;
FIG. 4 is a schematic view of a slider structure in a preferred embodiment of the present invention;
FIG. 5 is a front view of a mounting bracket in accordance with a preferred embodiment of the present invention;
FIG. 6 is a schematic illustration of the structure of a steel strip in a preferred embodiment of the invention;
FIG. 7 is a schematic diagram of the internal structure of a data acquisition unit in a preferred embodiment of the present invention;
FIG. 8 is a schematic diagram of the network connections within the data acquisition unit in the preferred embodiment of the present invention;
FIG. 9 is a schematic structural diagram of a photoelectric conversion unit according to a preferred embodiment of the present invention;
FIG. 10 is a schematic diagram of a monitoring and evaluation unit in accordance with a preferred embodiment of the present invention;
FIG. 11 illustrates a thermal fatigue monitoring and thermal fatigue analysis and evaluation software architecture according to a preferred embodiment of the present invention;
wherein: the fatigue monitoring sensor comprises a fatigue monitoring sensor component-1, a thermocouple-11, a sliding block-12, a lower sliding block-121, a rectangular through hole-1211, a circular through hole-1212, an arc-shaped groove-1213, a cover plate-122, a threaded hole-123, a metal braided hose-13, a nut-131, a mounting bracket-14, a connecting short pipe-141, a thread-1411, a steel belt-142, a through groove-1421, a connecting buckle-143, a data acquisition unit-2, a metal shell-21, a data acquisition module-22, a power supply module-23, a network module-24, a storage module-25, an environmental sensor-26, a first power carrier module-27, a photoelectric conversion unit-3, a transmitting end-31, a receiving end-32 and an optical fiber transceiver-33, the system comprises an optical fiber fusion box-34, a monitoring and analyzing evaluation unit-4, a disk array-41, a server-42, a display-43, a switch-44, a compensation cable-5, a network cable-6 and an optical cable-7.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not a whole embodiment. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the thermal fatigue monitoring system for the nuclear power plant pipeline of the embodiment includes a fatigue
The fatigue
As shown in fig. 1 to 11, the fatigue
1. fatigue
As shown in fig. 2 to 6, the fatigue
Wherein, N type
The metal braided
As shown in fig. 5-6, the
Fig. 4 shows a front view of the
The material of the positive and negative electrode conductors of the
The sensor assembly in the embodiment has good linearity, high precision and stability, and can realize long-term accurate monitoring of the radial circumferential temperature distribution of the pipeline under the high-irradiation environment on the premise of not damaging the structural integrity of the loop pipeline. In addition, the sensor assembly in this embodiment can flexibly set different numbers and angles of
In order to ensure that the measuring part of the sensor component can be tightly attached to the wall of the pipeline all the time when the pipeline expands with heat and contracts with cold and prevent the pipe from being broken, the material selected and used by the
2. Data acquisition unit 2
As shown in fig. 7, the data acquisition unit 2 has a strong mechanical strength and has good electromagnetic shielding performance and gamma ray shielding performance by using a lead core stainless
The
3.
As shown in fig. 9, the
4. Monitoring and
As shown in fig. 10, the monitoring and evaluation unit includes a
a thermal fatigue monitoring module:
(1) the main monitoring module comprises a window switching button, a real-time alarm information bar and a main monitoring interface. The specific positions and the running states of all fatigue monitoring sensor components on a loop pipeline are monitored in real time in a three-dimensional model mode, the types of the fatigue monitoring sensors and temperature gradient data for implementing measurement are displayed, and a temperature fluctuation curve is drawn.
(2) Thermal fatigue data dynamic monitoring module: the method is in a list form, and the measurement data, the state, the functional position and the like of the temperature sensor are displayed in real time;
(3) fatigue data query and derivation module: the snapshot data and the interpolation data measured by the fatigue monitoring sensor assembly can be inquired and derived for fatigue analysis and evaluation.
(4) A system fault diagnosis module: the system state can be monitored on line, when a certain device (such as a module) in the system breaks down, the system can automatically alarm, display the specific position of the broken-down module and preliminarily give out a failure analysis result.
(5) The alarm information display and recording module: the generated abnormity and faults are alarmed in real time, and alarm information is recorded through a historical database, so that troubleshooting and practical tracing are facilitated.
(6) The system online test module: routine tests of the nuclear power plant, such as cross contrast tests, channel verification and the like, can be carried out through the system.
Thermal fatigue analysis and evaluation module
(1) Fatigue evaluation module based on transient period statistics: the module classifies the temperature range through a rain flow method, and the analysis of the pipeline characteristic trend of the nuclear power plant after each operation cycle is completed.
(2) A transient-based fatigue evaluation module: the module can calculate the fatigue accumulation use factor of the pipeline by combining the cycle period identified by the fatigue evaluation module based on the transient period statistics with the original fatigue design analysis report of the nuclear power plant.
(3) Based on quick fatigue evaluation module of stress: the module is based on a local stress method, adopts unit transient state to carry out thermal load scanning, carries out cyclic stress calculation according to elasticity analysis, and finally calculates the fatigue accumulation use factor of the pipeline according to a designed fatigue curve.
The shells of the fatigue
The components, structures, methods of operation, and principles not specifically described in the above embodiments may be implemented using well-known or conventional means and conditions in the art.
The invention discloses a thermal fatigue monitoring system for a nuclear power plant pipeline, which mainly comprises a hardware system consisting of a fatigue monitoring sensor assembly, a data acquisition unit, a photoelectric conversion unit and a monitoring and analyzing and evaluating unit. The system measures temperature gradient data of fluid in a pipeline by installing a fatigue monitoring sensor assembly on a loop pipeline, the measured data is subjected to analog-to-digital conversion by a data acquisition unit, is transmitted outside a containment vessel through an electrical penetration piece by power carrier technology, is subjected to photoelectric conversion, and is provided for a monitoring and analysis evaluation unit to store and dynamically monitor, in addition, the data can be led into an analysis evaluation module, the evaluation module can evaluate the thermal fatigue damage state of the pipeline to different degrees according to different requirements through a fatigue evaluation module based on transient period statistics, a fatigue evaluation module based on transient state and 3 functional modules based on a stress rapid fatigue evaluation module, and the thermal fatigue accumulated use factor of the pipeline can be calculated, so that the system can be suitable for pipeline thermal fatigue monitoring of an in-service pressurized water reactor nuclear power plant.
The above embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement the invention, and not to limit the scope of the invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the scope of the present invention.
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