Nuclear power main steam isolation valve vibration state monitoring system and method based on multiple sensors

Abstract

The invention belongs to the technical field of nuclear power, and particularly relates to a nuclear power main steam isolation valve vibration state monitoring system and method based on multiple sensors. According to the nuclear power main steam isolation valve vibration state monitoring system based on the multiple sensors, the characteristic indexes capable of reflecting the equipment vibration intensity and the equipment state monitoring algorithm are constructed, the abnormal vibration can be timely and effectively alarmed, and the accident emergency response speed is increased; the invention provides an algorithm for converting a vibration signal into an audio signal, realizes online monitoring of vibration noise by using the collected vibration signal on the basis of not additionally adding a sensor, and saves the cost; the host of the system for monitoring the vibration state of the nuclear power main steam isolating valve is researched and developed, and the functions are integrated, so that on-site maintenance personnel can quickly operate, the continuous monitoring of the vibration noise of the main steam isolating valve is met, the manual detection requirement is reduced, the labor cost is saved, and the safety of a nuclear power station is improved.

Description

Technical Field

[0001] The present invention belongs to the field of nuclear power technology, and in particular relates to a multi-sensor based nuclear power main steam isolation valve vibration state monitoring system and method. Background Art

[0002] As one of the key equipment in the steam system of nuclear power plants, the main steam isolation valve plays a very important control role in the startup, stable operation and accidents of nuclear power plants. If the main steam isolation valve has problems such as abnormal vibration and loud noise during operation, it will damage the valve itself and reduce its service life. In severe cases, it may cause steam leakage accidents. The existing monitoring method is based on manual detection, which costs a lot of manpower, is inefficient and difficult to achieve real-time monitoring.

[0003] In response to the above problems, domestic and foreign experts and scholars have carried out some research work and proposed to monitor the operating status of the main steam isolation valve based on technical means such as lubricating oil analysis and temperature monitoring. However, these methods have shortcomings such as limited detection range and difficulty in achieving real-time online monitoring. In addition, these methods have high requirements for operation and maintenance personnel and are difficult to apply to engineering sites. Summary of the invention

[0004] In order to overcome the problems existing in the related technologies, a multi-sensor based nuclear power main steam isolation valve vibration state monitoring system and method is provided. By collecting various state signals of the main steam isolation valve during operation, the signal processing method is used to extract the characteristic parameters reflecting the equipment state, and then a specific algorithm is used to evaluate the operation state of the main steam isolation valve and alarm for abnormal situations. This can greatly save labor costs while effectively improving the safety of nuclear power plants.

[0005] According to one aspect of an embodiment of the present disclosure, a multi-sensor based nuclear power main steam isolation valve vibration state monitoring system is provided, the system comprising: a host and a plurality of sensors;

[0006] Each sensor layout is installed at a sampling point on the main steam isolation valve;

[0007] The host includes a conditioning module, an acquisition module, a control module, a display module, and a power module; the conditioning module is used to obtain the vibration signals collected and output by each sensor, and perform signal separation, filtering and amplification processing on the collected vibration information; the acquisition module is used to collect the vibration signals processed by the conditioning module and output them to the control module; the control module realizes valve vibration status evaluation, online monitoring of vibration noise, communication transmission, sampling control and data storage according to the received vibration signals; the display module is used to display the change trend of the monitoring indicators output by the control module, historical data and valve vibration abnormality alarm; the power module is used to power the system.

[0008] In a possible implementation, a three-axis vibration sensor is installed at the upper drive device plane and the middle bracket of the main steam isolation valve, and a high-temperature single-axis vibration sensor is installed in two directions perpendicular to each other on the outlet pipe of the main steam isolation valve.

[0009] In a possible implementation, each sensor is adapted to be mounted on a base, and the base is welded to the surface of the sampling point or fixed by a cable tie.

[0010] In a possible implementation, the host is installed at the main steam isolation valve operation site, and the host is installed on the wall of the main steam isolation valve working room with expansion bolts with the interface facing downward, and the sensor is connected to the host through a flexible cable.

[0011] In a possible implementation, the host implements vibration status monitoring of the nuclear power main steam isolation valve using the following method:

[0012] Step 1, filtering and amplifying the vibration signals collected by the sensors at each sampling point through a conditioning module, and then collecting them through a collection module to obtain a vibration signal for reflecting the operating status of the valve;

[0013] Step 2, extracting the vibration severity and acceleration level reflecting the vibration intensity of the main steam isolation valve from the processed vibration signal;

[0014] Step 3: for each sampling point, compare the vibration intensity currently extracted at the sampling point with the intensity threshold corresponding to the sampling point, and compare the acceleration level extracted at the sampling point with the level threshold corresponding to the sampling point;

[0015] Step 4: if the vibration intensity currently extracted by the sampling point exceeds the corresponding intensity threshold, the sampling point identifier, the current time and the current vibration intensity are recorded; if the acceleration level currently extracted by the sampling point exceeds the corresponding level threshold, the sampling point identifier, the current time and the current acceleration level are recorded;

[0016] Step 5: If the vibration intensity of the sampling point exceeds the corresponding intensity threshold number of times and / or the acceleration level exceeds the corresponding level threshold number of times, the alarm device is triggered to send an alarm signal, which is used to indicate that the vibration of the sampling point is abnormal.

[0017] In a possible implementation, the host implements noise monitoring of the nuclear power main steam isolation valve using the following method:

[0018] Step 6, converting the acceleration level extracted from each sampling point into a noise level;

[0019] Step 7: If the noise level currently determined at the sampling point exceeds the corresponding noise threshold, the sampling point identifier, the current time, and the current noise level are recorded;

[0020] Step 8: If the number of times that the noise level at the sampling point exceeds the corresponding noise threshold exceeds the threshold, the alarm device is triggered to send out an alarm signal, which is used to indicate that vibration noise exists at the sampling point.

[0021] According to one aspect of an embodiment of the present disclosure, a method for monitoring the vibration state of a nuclear power main steam isolation valve based on multiple sensors is provided. The method is implemented based on the above-mentioned system, and the method includes:

[0022] Step 1, filtering and amplifying the vibration signals collected by the sensors at each sampling point through a conditioning module, and then collecting them through a collection module to obtain a vibration signal for reflecting the operating status of the valve;

[0023] Step 2, extracting the vibration severity and acceleration level reflecting the vibration intensity of the main steam isolation valve from the processed vibration signal;

[0024] Step 3: for each sampling point, compare the vibration intensity currently extracted at the sampling point with the intensity threshold corresponding to the sampling point, and compare the acceleration level extracted at the sampling point with the level threshold corresponding to the sampling point;

[0025] Step 4: if the vibration intensity currently extracted by the sampling point exceeds the corresponding intensity threshold, the sampling point identifier, the current time and the current vibration intensity are recorded; if the acceleration level currently extracted by the sampling point exceeds the corresponding level threshold, the sampling point identifier, the current time and the current acceleration level are recorded;

[0026] Step 5: If the vibration intensity of the sampling point exceeds the corresponding intensity threshold number of times and / or the acceleration level exceeds the corresponding level threshold number of times, the alarm device is triggered to send an alarm signal, which is used to indicate that the vibration of the sampling point is abnormal.

[0027] In a possible implementation, the method further includes:

[0028] Step 6, converting the acceleration level extracted from each sampling point into a noise level;

[0029] Step 7: If the noise level currently determined at the sampling point exceeds the corresponding noise threshold, the sampling point identifier, the current time, and the current noise level are recorded;

[0030] Step 8: If the number of times that the noise level at the sampling point exceeds the corresponding noise threshold exceeds the threshold, the alarm device is triggered to send out an alarm signal, which is used to indicate that vibration noise exists at the sampling point.

[0031] The beneficial effects of the present disclosure are as follows: the nuclear power main steam isolation valve vibration status monitoring system based on multiple sensors provided by the present disclosure constructs characteristic indicators and equipment status monitoring algorithms that can reflect the strong vibration of the equipment, realizes timely and effective alarm for abnormal vibration, and improves the emergency response speed of accidents; provides a vibration signal to audio signal conversion algorithm, realizes online monitoring of vibration noise by using the collected vibration signal without adding additional sensors, and saves costs; develops a nuclear power main steam isolation valve vibration status monitoring system host, integrates the above functions, so that on-site maintenance personnel can quickly get started and meet the continuous monitoring of the vibration noise of the main steam isolation valve, reduces the need for manual detection, saves labor costs, and improves the safety of nuclear power plants. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a block diagram of a nuclear power main steam isolation valve vibration status monitoring system based on multiple sensors shown in an embodiment of the present disclosure.

[0033] Figure 2 It is a flow chart of a method for monitoring the vibration status of a nuclear power main steam isolation valve based on multiple sensors shown in an embodiment of the present disclosure.

[0034] Figure 3 It is a schematic diagram of a nuclear power main steam isolation valve vibration status monitoring system based on multiple sensors shown in an embodiment of the present disclosure.

[0035] Figure 4 It is a schematic diagram of a host of a nuclear power main steam isolation valve vibration status monitoring system based on multiple sensors shown in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0036] The present disclosure is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Unless otherwise defined, the technical and scientific terms used in the present disclosure have the same meanings as those generally understood by those skilled in the art to which the present disclosure belongs; the terms used in the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure; the term "including" and any variations thereof in the present disclosure are intended to cover non-exclusive inclusions. Obviously, the embodiments described in the present disclosure are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making creative efforts are within the scope of protection of the present disclosure.

[0038] Reference to "embodiments" in this disclosure means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the disclosure. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0039] Figure 1 is a block diagram of a nuclear power main steam isolation valve vibration state monitoring system based on multiple sensors shown in an embodiment of the present disclosure, such as Figure 1 As shown, the system includes a host and multiple sensors.

[0040] Each sensor is installed at a sampling point of the main steam isolation valve, and different sensors are used to collect vibration signals from different parts of the main steam isolation valve; the host includes a conditioning module, an acquisition module, a control module, a display module, and a power module. The conditioning module is used to obtain the vibration signals collected and output by each sensor, and perform signal separation, filtering and amplification processing on the collected vibration information; the acquisition module is used to collect the vibration signals processed by the conditioning module and output them to the control module; the control module implements valve vibration status evaluation, online monitoring of vibration noise, communication transmission, sampling control and data storage based on the received vibration signals; the display module is used to display the change trend of the monitoring indicators output by the control module, historical data and valve vibration abnormality alarm; the power module is used to power the system.

[0041] For example, the sensor can be an acceleration sensor. When carrying out the vibration status monitoring of the main steam isolation valve, each sensor is installed at a sampling point of the main steam isolation valve according to the preset layout plan, and each sensor is connected to the host through a flexible cable. The signal collected by each sensor is amplified and filtered by the conditioning module, and then transmitted to the acquisition module to realize signal collection. Finally, the signal is analyzed in the control module and the vibration noise evaluation results are displayed in the display window. The host can collect, process and analyze the status data of the main steam isolation valve; visualize the change trend of the monitoring indicators, historical data and other information; realize online monitoring of vibration noise and abnormal valve vibration alarm.

[0042] Figure 2 This is a flow chart of a method for monitoring the vibration status of a nuclear power main steam isolation valve based on multiple sensors, which is shown in an embodiment of the present disclosure. The main function of this method is to timely and effectively analyze the collected valve status signal and evaluate the vibration status of the valve, which is integrated into the control module of the front-end digital unit. Figure 2 As shown, the method includes:

[0043] Step 1: After filtering and amplifying the vibration signals collected by the sensors at each sampling point through a conditioning module, the vibration signals are collected through a collection module to obtain vibration signals for reflecting the operating status of the valve.

[0044] Step 2: extracting the vibration severity and acceleration level reflecting the vibration intensity of the main steam isolation valve from the processed vibration signal.

[0045] For example, for each sampling point, the vibration severity of the sampling point can be determined using Formula 1, and the acceleration level of the sampling point can be determined using Formula 2.

[0046]

[0047] Among them, V ims is the vibration intensity of the sampling point, which is used to indicate the average displacement of the sampling point per unit time, in units of mm / s, N is the sample length of the sensor signal; v(n) is the nth velocity signal collected by the sensor, 1<n<N.

[0048] La = 201g (a / a0) Formula 2

[0049] Where La is the acceleration level of the sampling point, a is the effective value of acceleration determined according to the speed signal obtained by the sensor; a0 is the reference acceleration, and the value of a0 can be, for example, 1*10 -6 m / s 2 .

[0050] Step 3, for each sampling point, compare the vibration intensity currently extracted from the sampling point with the intensity threshold corresponding to the sampling point, and compare the acceleration level extracted from the sampling point with the level threshold corresponding to the sampling point. For example, the corresponding intensity threshold and level threshold can be preset for each sampling point based on historical data or empirical values, and the intensity thresholds and level thresholds at different locations can be partially the same, completely the same, or completely different. In this way, the present disclosure can fully monitor the vibration conditions of key locations of the valve through multi-channel real-time acquisition, and the sampling points can be dynamically adjusted as needed, thereby flexibly applicable to a variety of application scenarios.

[0051] Step 4: If the vibration intensity currently extracted by the sampling point exceeds the corresponding intensity threshold, the sampling point identifier, current time and current vibration intensity are recorded; if the acceleration level currently extracted by the sampling point exceeds the corresponding level threshold, the sampling point identifier, current time and current acceleration level are recorded.

[0052] Step 5: If the vibration intensity of the sampling point exceeds the corresponding intensity threshold number of times and / or the acceleration level exceeds the corresponding level threshold number of times, the alarm device is triggered to send an alarm signal, which is used to indicate that the vibration of the sampling point is abnormal.

[0053] In a possible implementation, the method of the present disclosure further includes:

[0054] Step 6: Convert the acceleration level extracted from each sampling point into a noise level. In step 6, a formula for converting acceleration data into audio may be selected as needed to determine the noise level of each sampling point, which is not limited in the present disclosure.

[0055] Step 7: If the noise level currently determined at the sampling point exceeds the corresponding noise threshold, the sampling point identifier, the current time, and the current noise level are recorded.

[0056] Step 8: If the number of times that the noise level at the sampling point exceeds the corresponding noise threshold exceeds the threshold, the alarm device is triggered to send out an alarm signal, which is used to indicate that vibration noise exists at the sampling point.

[0057] Generally speaking, when the main steam isolation valve vibrates abnormally, the corresponding noise will also change significantly. However, in the related art, it is impossible to effectively monitor the noise due to the limitations of the sensor installation position, signal attenuation, sensor working range and control of the monitoring system cost. The present invention converts the format of the collected original vibration data and performs downsampling processing to obtain the corresponding vibration noise audio data. This makes it convenient for staff to monitor the vibration noise.

[0058] The nuclear power main steam isolation valve vibration status monitoring system provided by the present disclosure uses a combination of software and hardware to achieve online monitoring of the equipment health status of the entire process from signal acquisition, data processing and analysis, equipment status evaluation and alarm. The system is highly integrated, making the operation simple and easy to use; and it can monitor the vibration of the main steam isolation valve in real time, thereby saving labor costs.

[0059] Figure 3 is a schematic diagram of a nuclear power main steam isolation valve vibration state monitoring system based on multiple sensors shown in an embodiment of the present disclosure, such as Figure 3 As shown, the main steam isolation valve includes a valve body and control components. The valve body includes a shell, a valve cover, a valve seat, a gate, a valve stem, a belt ring and a bracket. The control components include a hydraulic device, a nitrogen storage tank, an electronic control device and a limit switch. In order to collect abnormal signals in a timely and effective manner, a three-axis vibration sensor is installed on the upper drive device plane and the middle bracket of the main steam isolation valve, and a high-temperature single-axis vibration sensor is installed in two directions perpendicular to each other on the outlet pipe. At the same time, in order to ensure the reliability of the installation and prevent loosening, each sensor is equipped with a mounting base, and the base is welded to the surface of the valve structure sampling point or fixed with a cable tie.

[0060] Figure 4The main steam isolation valve vibration condition monitoring host is shown in Figure 4 , the host is installed at the operation site of the main steam isolation valve, so as to facilitate the monitoring of the vibration of the valve. When used at the project site, the host is installed on the wall of the main steam isolation valve working room with the M8 expansion bolts and the interface facing downward, and the sensor is connected to the host through a soft cable to obtain the signal collected by the sensor. The above signal is transmitted to the control module after amplification, filtering, signal separation, and digital-to-analog conversion; the above digital signal is analyzed and processed in the control module to obtain the evaluation result of the valve status, and the evaluation result is transmitted to the display module for display.

[0061] The main steam isolation valve vibration state assessment method and the vibration noise online monitoring technology of converting vibration signals into audio signals are integrated in the control module. First, the collected signals are pre-processed by amplification, filtering, separation, etc., and then the features of these signals are extracted according to the vibration state assessment method and the valve vibration state is evaluated according to the feature samples. When the state assessment method is used for the first time, two important indicators, the feature threshold K and the cumulative overthreshold J, need to be given, so that the algorithm can timely and effectively evaluate the valve vibration state and alarm for abnormal vibration. In addition, the collected signals are converted by the vibration signal to audio signal technology to realize online monitoring of vibration noise.

[0062] The embodiments of the present disclosure have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A multi-sensor based nuclear power main steam isolation valve vibration status monitoring system, characterized in that: The system comprises: a host and a plurality of sensors; Each sensor layout is installed at a sampling point on the main steam isolation valve; The host includes a conditioning module, an acquisition module, a control module, a display module, and a power module; the conditioning module is used to obtain the vibration signals collected and output by each sensor, and perform signal separation, filtering and amplification processing on the collected vibration information; the acquisition module is used to collect the vibration signals processed by the conditioning module and output them to the control module; the control module realizes valve vibration status evaluation, online monitoring of vibration noise, communication transmission, sampling control and data storage according to the received vibration signals; the display module is used to display the change trend of the monitoring indicators output by the control module, historical data and valve vibration abnormality alarm; the power module is used to power the system.

2. The system according to claim 1, characterized in that A three-axis vibration sensor is installed at the upper drive device plane and the middle bracket of the main steam isolation valve, and a high-temperature single-axis vibration sensor is installed in two directions perpendicular to each other on the outlet pipe of the main steam isolation valve.

3. The system according to claim 1, characterized in that Each sensor is equipped with a mounting base, and the base is welded to the surface of the sampling point or fixed by a cable tie.

4. The system according to claim 1, characterized in that The host is installed at the main steam isolation valve operation site. The host is installed on the wall of the main steam isolation valve working room with expansion bolts and the interface facing downward, and the sensor is connected to the host through a flexible cable.

5. The system according to claim 1, characterized in that The host adopts the following method to realize the vibration status monitoring of the nuclear power main steam isolation valve: Step 1, filtering and amplifying the vibration signals collected by the sensors at each sampling point through a conditioning module, and then collecting them through a collection module to obtain a vibration signal for reflecting the operating status of the valve; Step 2, extracting the vibration severity and acceleration level reflecting the vibration intensity of the main steam isolation valve from the processed vibration signal; Step 3: for each sampling point, compare the vibration intensity currently extracted at the sampling point with the intensity threshold corresponding to the sampling point, and compare the acceleration level extracted at the sampling point with the level threshold corresponding to the sampling point; Step 4: If the vibration intensity currently extracted by the sampling point exceeds the corresponding intensity threshold, the sampling point identifier, current time and current vibration intensity are recorded; If the acceleration level currently extracted by the sampling point exceeds the corresponding level threshold, the sampling point identifier, current time and current acceleration level are recorded; Step 5: If the vibration intensity of the sampling point exceeds the corresponding intensity threshold number of times and / or the acceleration level exceeds the corresponding level threshold number of times, the alarm device is triggered to send an alarm signal, which is used to indicate that the vibration of the sampling point is abnormal.

6. The system according to claim 5, characterized in that The host adopts the following method to realize the noise monitoring of the nuclear power main steam isolation valve: Step 6, converting the acceleration level extracted from each sampling point into a noise level; Step 7: If the noise level currently determined at the sampling point exceeds the corresponding noise threshold, the sampling point identifier, the current time, and the current noise level are recorded; Step 8: If the number of times that the noise level at the sampling point exceeds the corresponding noise threshold exceeds the threshold, the alarm device is triggered to send out an alarm signal, which is used to indicate that vibration noise exists at the sampling point.

7. A method for monitoring the vibration status of a nuclear power main steam isolation valve based on multiple sensors, characterized in that: The method is implemented based on the system according to any one of claims 1 to 6, and the method includes: Step 1, filtering and amplifying the vibration signals collected by the sensors at each sampling point through a conditioning module, and then collecting them through a collection module to obtain a vibration signal for reflecting the operating status of the valve; Step 2, extracting the vibration severity and acceleration level reflecting the vibration intensity of the main steam isolation valve from the processed vibration signal; Step 3: for each sampling point, compare the vibration intensity currently extracted at the sampling point with the intensity threshold corresponding to the sampling point, and compare the acceleration level extracted at the sampling point with the level threshold corresponding to the sampling point; Step 4: If the vibration intensity currently extracted by the sampling point exceeds the corresponding intensity threshold, the sampling point identifier, the current time, and the current vibration intensity are recorded; if the acceleration level currently extracted by the sampling point exceeds the corresponding level threshold, the sampling point identifier, the current time, and the current acceleration level are recorded; Step 5: If the vibration intensity of the sampling point exceeds the corresponding intensity threshold number of times and / or the acceleration level exceeds the corresponding level threshold number of times, the alarm device is triggered to send an alarm signal, which is used to indicate that the vibration of the sampling point is abnormal.

8. The method according to claim 7, characterized in that The method further comprises: Step 6, converting the acceleration level extracted from each sampling point into a noise level; Step 7: If the noise level currently determined at the sampling point exceeds the corresponding noise threshold, the sampling point identifier, the current time, and the current noise level are recorded; Step 8: If the number of times that the noise level at the sampling point exceeds the corresponding noise threshold exceeds the threshold, the alarm device is triggered to send out an alarm signal, which is used to indicate that vibration noise exists at the sampling point.

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