CN114091811A - Maintenance decision system for circulating water pump of nuclear power plant and design method - Google Patents
Maintenance decision system for circulating water pump of nuclear power plant and design method Download PDFInfo
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Abstract
The invention relates to a maintenance decision system of a circulating water pump of a nuclear power plant and a design method thereof, wherein the system comprises: the on-line monitoring and state evaluation unit is used for carrying out real-time on-line monitoring on the circulating water pump and judging the current state grade of the circulating water pump; the fault diagnosis unit is used for diagnosing and analyzing the circulating water pump and giving out detailed fault information of the circulating water pump; the health prediction unit is used for predicting the health development trend of the circulating water pump and giving the remaining available time of the current circulating water pump; and the maintenance scheme decision unit is used for giving a proposal of the maintenance scheme of the circulating water pump according to factors such as fault diagnosis condition, health trend prediction, maintenance conditions and the like of the circulating water pump. The invention can realize accurate maintenance based on the state grade of the current circulating water pump, reduce the maintenance frequency and cost and improve the service life and the availability ratio of equipment.
Description
Technical Field
The invention belongs to the design technology of nuclear power plants, and particularly relates to a maintenance decision system and a design method of a circulating water pump of a nuclear power plant.
Background
The function of the circulating water system is to provide cooling water for a condenser of a steam turbine of the conventional island and an auxiliary cooling system of the conventional island, and the circulating water pump plays a very important role in the system as a lifting device. Common types of circulating water pumps include concrete volute pumps and metal diagonal flow pumps, and the main parameters include flow, lift, efficiency, pump speed, motor voltage, motor power and the like. The circulating water pump is large in size and weight, multiple in core equipment and instruments and high in maintenance difficulty, and is mainly controlled by a DCS (distributed control system) of a main control room at present and guided to operate by an alarm manual.
The maintenance mode of the circulating water pump mainly comprises two modes of correction maintenance and periodic maintenance. The corrective maintenance means that when the circulating water pump fails and gives an alarm, manual intervention is needed, operation and maintenance personnel handle abnormality according to regulations, when the fault is serious and the pump is stopped, the fault is diagnosed and maintained manually, and the maintenance personnel troubleshoot the fault according to a system manual and an alarm manual. Regular maintenance refers to fixed frequency maintenance work performed to prevent equipment failure. In the past, it was difficult to effectively identify the potential for failure during the maintenance interval. Meanwhile, the circulating water pump is large in maintenance difficulty, long in construction period, high in cost and high in investment of a large amount of manpower and material resources.
The two existing maintenance modes of the circulating water pump have the problems of excessive maintenance and hidden trouble. On the one hand, when the circulating water pump is not in fault, operation and maintenance personnel regularly maintain the circulating water pump, and disassemble and maintain the circulating water pump according to fixed disassembly inspection rule files in the overhaul period, so that the construction period is long, the cost is high, and a large amount of manpower and material resources are consumed. On the other hand, after a fault occurs, when the monitoring value of the relevant monitoring instrument exceeds the set alarm threshold value, an alarm signal is usually triggered, operation and maintenance personnel need to perform fault troubleshooting on the circulating water pump to troubleshoot whether the alarm is caused by instrument faults or other external factors, after the real alarm is confirmed, other auxiliary measures such as an on-site measuring instrument or experience of the operation and maintenance personnel need to be used for analyzing possible reasons of the fault, and for some faults with uncertain reasons, even the operation and maintenance personnel may need to repeatedly troubleshoot. The workload of operation and maintenance personnel and the required operation and maintenance cost are increased, and the normal operation of the nuclear power station is influenced. How to predict the state of the circulating water pump in time before the circulating water pump breaks down, give reasons and remaining available time for possible faults and give corresponding maintenance decision suggestions so that operation and maintenance personnel can judge the running condition of the circulating water pump in advance, and the method is a problem to be solved urgently.
Disclosure of Invention
The invention aims to provide a maintenance decision system and a design method of a circulating water pump of a nuclear power plant aiming at the defects in the prior art, which are convenient for operation and maintenance personnel to judge the running condition of the circulating water pump and timely and accurately give a corresponding maintenance decision suggestion.
The technical scheme of the invention is as follows: a nuclear power plant circulating water pump maintenance decision making system comprises:
the on-line monitoring and state evaluation unit is used for carrying out real-time on-line monitoring on the circulating water pump and judging the current state grade of the circulating water pump;
the fault diagnosis unit is used for diagnosing and analyzing the circulating water pump and providing detailed fault information and a historical maintenance list of the circulating water pump;
the health prediction unit is used for predicting the health development trend of the circulating water pump and giving the remaining available time of the current circulating water pump;
and the maintenance scheme decision unit is used for giving a proposal of the maintenance scheme of the circulating water pump according to factors such as fault diagnosis condition, health trend prediction, maintenance conditions and the like of the circulating water pump.
Further, the maintenance decision system for the circulating water pump of the nuclear power plant comprises an online monitoring and state evaluation unit, a monitoring and evaluation model module and a parameter curve and state output module, wherein the online monitoring and state evaluation unit comprises a parameter acquisition input module, the monitoring and evaluation model module and the parameter curve and state output module;
the parameter acquisition input module acquires and inputs the running parameters of the circulating water pump into the system through a data acquisition instrument, and the running parameters of the circulating water pump are monitored on line;
the monitoring and evaluating model module is used for constructing a monitoring and evaluating model based on historical operating data of the circulating water pump, and calculating a prediction simulation curve and an operating parameter curve through the monitoring and evaluating model, wherein the prediction simulation curve is a parameter curve of the circulating water pump predicted by the monitoring and evaluating model in a normal operating state;
the parameter curve and state output module displays a prediction simulation curve obtained through calculation of the monitoring and evaluation model and detailed information of an operation parameter curve of the circulating water pump in the current operation state acquired in real time through the sensor, and gives the current state grade of the circulating water pump according to the variation trend of the deviation between the prediction simulation curve and the operation parameter curve of the circulating water pump.
Further, the maintenance decision system for the circulating water pump of the nuclear power plant is described above, wherein the operating parameters of the circulating water pump collected by the data collecting instrument include vibration parameters, temperature parameters, and the like.
Further, the maintenance decision system for the circulating water pump of the nuclear power plant is characterized in that the current state grade of the circulating water pump comprises four states of health, early warning, abnormity and fault.
Further, the maintenance decision system for the circulating water pump of the nuclear power plant is described above, wherein the detailed fault information of the circulating water pump given by the fault diagnosis unit includes: the time of fault occurrence, the name and function of the component with fault occurrence, the fault mode, the fault reason, the applicable working conditions, the fault influence, the fault symptom and the inspection method, and the compensation measures which can be taken for ensuring the function of the equipment.
Further, according to the maintenance decision system for the circulating water pump of the nuclear power plant, the fault diagnosis unit calculates to obtain the characteristic map information according to the operation parameters of the circulating water pump, and the fault mode is correspondingly generated through the characteristic map.
Further, according to the maintenance decision-making system for the circulating water pump of the nuclear power plant, the health prediction unit utilizes the circulating water pump fault performance degradation data acquired by the circulating water pump test bed to construct a prediction model, the prediction model is trained and applied to a real circulating water pump, and the health development trend and the remaining available time of the circulating water pump are predicted based on the acquired circulating water pump operation parameters.
Furthermore, the health prediction unit obtains a health prediction curve through calculation, the abscissa is time, the ordinate is a health index, the change trend of the health index of the circulating water pump in a future time period is shown, and the remaining available time of the component is displayed on the curve, so that operation and maintenance personnel can judge whether the currently adopted measure is to continue to maintain the operation of the circulating water pump or stop the pump for maintenance according to the time.
Further, the maintenance decision system for the circulating water pump of the nuclear power plant is described above, wherein the circulating water pump maintenance proposal provided by the maintenance proposal decision unit includes: the maintenance method comprises maintenance time, a maintenance mode and maintenance pushing, wherein the maintenance time and the maintenance mode are suggested maintenance time and maintenance modes calculated by the system according to fault information and health indication information, and the maintenance pushing is required rule items matched by the maintenance mode system and comprises shutdown rules required by the maintenance of the circulating water pump or specific item contents of the maintenance rules.
Based on the maintenance decision system of the circulating water pump of the nuclear power plant, the invention provides a maintenance decision design method of the circulating water pump of the nuclear power plant, which comprises the following steps:
carrying out real-time online monitoring on the circulating water pump, acquiring real-time operation parameters of the circulating water pump, and judging the current state grade of the circulating water pump;
when the current state grade of the circulating water pump is in a non-healthy state, diagnosing and analyzing the circulating water pump, and giving detailed fault information and a historical maintenance list of the circulating water pump;
constructing a prediction model by using the circulating water pump fault performance degradation data acquired by the circulating water pump test bed, predicting the health development trend of the circulating water pump and giving the remaining available time of the current circulating water pump;
and according to factors such as fault diagnosis conditions, health development trends, prediction of remaining available time, maintenance conditions and the like of the circulating water pump, providing a proposal of a circulating water pump maintenance scheme.
Further, according to the maintenance decision design method for the circulating water pump of the nuclear power plant, when the current state grade of the circulating water pump is judged, a prediction simulation curve and an operation parameter curve are calculated through the monitoring and evaluation model, wherein the prediction simulation curve is a parameter curve of the circulating water pump predicted by the monitoring and evaluation model in the normal operation state; and giving the current state grade of the circulating water pump according to the variation trend of the deviation between the prediction simulation curve of the circulating water pump and the operation parameter curve of the circulating water pump in the current operation state acquired in real time through the sensor.
Furthermore, the current state grade of the circulating water pump comprises four states of health, early warning, abnormity and fault.
Further, according to the maintenance decision design method for the circulating water pump of the nuclear power plant, when the circulating water pump is diagnosed and analyzed, the characteristic map information is obtained through calculation according to the operation parameters of the circulating water pump, and the fault mode which occurs correspondingly through the characteristic map is adopted.
Further, according to the maintenance decision design method for the circulating water pump of the nuclear power plant, if the fault reason cannot be given through fault diagnosis, the fault reason can be judged by entering an expert decision system based on expert experience.
Further, according to the maintenance decision design method for the nuclear power plant circulating water pump, an operation and maintenance person checks a recommended circulating water pump maintenance scheme to achieve accurate maintenance based on the current state grade, and determines whether to approve a maintenance decision result by checking corresponding input information including fault time, scheduled overhaul time, fault position, fault mode, remaining available time and spare part information table.
The invention has the following beneficial effects: the maintenance decision system for the circulating water pump of the nuclear power plant provided by the invention is used for carrying out real-time online monitoring on the circulating water pump and judging whether the current state grade of the circulating water pump is in a healthy state or not according to the online monitoring result; when the circulating water pump is in a healthy state, continuously carrying out online monitoring and state evaluation on the circulating water pump; when the circulating water pump is in an unhealthy state, determining a fault position and a fault mode through fault diagnosis, and if the fault reason cannot be given through fault diagnosis, entering an expert decision system to judge based on expert experience; and finally, providing a proposal of an optimized circulating water pump maintenance scheme according to factors such as fault diagnosis conditions, health degradation trend prediction, maintenance conditions and the like of the circulating water pump. The invention can realize accurate maintenance based on the state grade of the current circulating water pump, reduce the maintenance frequency and cost and improve the service life and the availability ratio of equipment.
Drawings
FIG. 1 is a flow chart of a maintenance decision design method of a circulating water pump of a nuclear power plant.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a maintenance decision system and a design method for a circulating water pump of a nuclear power plant, which are used for monitoring the circulating water pump in real time on line and judging whether the current state grade of the circulating water pump is in a healthy state or not according to the online monitoring result; when the circulating water pump is in a healthy state, continuously carrying out online monitoring and state evaluation on the circulating water pump; when the circulating water pump is in an unhealthy state, determining a fault position and a fault mode through fault diagnosis, and if the fault reason cannot be given through fault diagnosis, entering an expert decision system to judge based on expert experience; and finally, providing a proposal of an optimized circulating water pump maintenance scheme according to factors such as fault diagnosis conditions, fault degradation trend prediction, maintenance conditions and the like of the circulating water pump.
The invention discloses a maintenance decision system of a circulating water pump of a nuclear power plant, which comprises:
the on-line monitoring and state evaluation unit is used for carrying out real-time on-line monitoring on the circulating water pump and judging the current state grade of the circulating water pump;
the fault diagnosis unit is used for diagnosing and analyzing the circulating water pump and providing detailed fault information and a historical maintenance list of the circulating water pump;
the health prediction unit is used for predicting the health development trend of the circulating water pump and giving the remaining available time of the current circulating water pump;
and the maintenance scheme decision unit is used for giving a proposal of the maintenance scheme of the circulating water pump according to factors such as fault diagnosis condition, health trend prediction, maintenance conditions and the like of the circulating water pump.
As shown in fig. 1, the specific design scheme is as follows:
1. on-line monitoring and status evaluation unit
The circulating water pump in the nuclear power plant is provided with measuring instruments for parameters such as vibration, temperature and the like, the parameters are collected and gathered into the system through a data collecting instrument, and the collected parameter curve is directly displayed in the system, namely, the running parameters of the circulating water pump are monitored on line. And all the measuring point information on the circulating water pump is displayed in a parameter acquisition input module in an 'online monitoring and state evaluation interface' in a form of a table, and comprises measuring point position numbers and measuring point names on the circulating water pump. The operation and maintenance personnel click and select the measuring point parameters to be checked, so that the detailed information of the dynamic monitoring curve corresponding to the parameters is displayed, the running condition of the circulating water pump is displayed more clearly and visually, and the operation and maintenance personnel can trace to the source conveniently.
And setting a monitoring and evaluating model by using an auto-associative artificial neuron network algorithm, an auto-associative kernel regression algorithm and the like, training the model based on historical operating data of the circulating water pump to determine model parameters, wherein the trained model is the core of the monitoring and evaluating model module in the 'online monitoring and state evaluating interface' of the invention. The operation and maintenance personnel can click and select the measuring point parameters to be checked, so that the output module displays the prediction simulation curve obtained through model calculation and the detailed information of the operation parameter curve of the circulating water pump in the current operation state, which is acquired in real time through the sensor. The prediction simulation curve is a parameter curve of the circulating water pump in the normal operation state predicted by the monitoring and evaluating model, and when the prediction simulation curve is consistent with the current operation parameter curve of the circulating water pump, the current operation condition of the circulating water pump is the same as the normal operation condition, namely the current state of the circulating water pump is in the healthy state. When the prediction simulation curve and the current operation parameter curve of the circulating water pump have deviation, the current operation condition of the circulating water pump deviates from normal operation, namely the current state of the circulating water pump is in an unhealthy state. And dividing the unhealthy state of the circulating water pump into three states of early warning, abnormity and fault according to the deviation value.
In the step, the operation of the circulating water pump can be monitored on line in real time, and the states of the circulating water pump are divided into four states of health, early warning, abnormity and fault according to the variation trend of the forecast simulation curve and the operation parameter curve deviation value of the circulating water pump. The four states are displayed in a text and color mode respectively (green represents health, yellow represents early warning, orange represents abnormity, and red represents fault), so that operation and maintenance personnel can clearly determine the current state of the circulating water pump. By comparing the prediction simulation curve with the operation parameter curve, the abnormity of the variation trend of the operation parameters is effectively identified, and therefore the state of the circulating water pump is predicted and evaluated in advance. When the state of the circulating water pump is in a healthy state, the steps are repeated, the circulating water pump is continuously monitored and evaluated, and when the state of the circulating water pump is in an unhealthy state (early warning, abnormity and faults), the circulating water pump enters a fault diagnosis unit, and faults and reasons which are possibly generated by the circulating water pump are judged.
2. Fault diagnosis unit
And when the online monitoring and state evaluation unit evaluates that the current state of the circulating water pump is in an unhealthy state, entering a fault diagnosis unit. The fault diagnosis unit directly gives detailed information of the fault of the circulating water pump. The fault time is the time when a fault occurs, the name of a component and the function of the component are the name and the function of the component with the fault, the fault mode and the fault reason are the fault mode and the reason given by the analysis of the step, the applicable working condition is the normal operating condition of the circulating water pump, the fault influence is the three-level influence which is possibly generated when the component has the fault and comprises the local influence, the influence of the first level and the final influence, the fault symptom and inspection method is the symptom and inspection method in the current fault mode, and the use compensation is the compensation measure which can be taken to ensure the function of the equipment in the current fault mode. The historical repair list gives a historical repair record of the component, including the time at which the fault occurred, a description of the specific fault, and the effective measures taken against the historical fault. In this step, the operation and maintenance personnel can directly see the result given by the fault diagnosis, namely, a certain component of the circulating water pump is likely to have a fault in a future time period, and the maintenance measures suitable for the fault of the component can be comprehensively judged by combining the historical maintenance list of the component.
In the step, in order to facilitate the operation and maintenance personnel to check the source of the fault judgment result, a data input and output module is arranged, the data input module comprises the parameter information used in the model calculation in the step, and the running parameter information of the circulating water pump can be directly checked. The output module calculates the obtained characteristic map information (such as a vibration time domain map, a frequency spectrum map, an axis locus and the like) through a model, and can correspondingly generate a fault mode according to the output characteristic map.
3. Health prediction unit
The meaning of health prediction is to give the remaining available time of the current circulating water pump, and the fault diagnosis can be carried out simultaneously. And respectively processing fault test pieces with different damage diameters by using a circulating water pump test bed to complete the test and obtain the fault performance degradation data of the circulating water pump. And establishing a prediction model based on the long-term and short-term memory network, and predicting the healthy development trend and the remaining available time of the circulating water pump. The method comprises the steps of completing transfer training from a circulating water pump test bench to a real circulating water pump based on a transfer learning model, utilizing a neural network of the bench test to pre-train, applying parameters to the real circulating water pump, and predicting the healthy development trend and the remaining available time of the circulating water pump based on collected signals.
In this step, the horizontal coordinate is time, the vertical coordinate is health index, which indicates the change trend of the health index of the circulating water pump in the future time period, and the remaining available time of the component is displayed on the curve, so that the operation and maintenance personnel can judge whether the currently adopted measure is to continue to maintain the operation of the circulating water pump or stop the pump for maintenance according to the time.
4. Maintenance scheme decision unit
Based on the above-described steps, the case where the current state of the circulation water pump is in the four-level state, the failure mode and the cause that may occur, and the remaining usable time of the circulation water pump can be known. And taking the output results of the three step units as the input of a maintenance scheme decision unit, and establishing a dynamic life-cycle maintenance decision model of the circulating water pump based on the contents of historical maintenance information, spare part information, component cost, maintenance cycle and the like. The output result of the step comprises suggested maintenance time, a suggested maintenance mode and a suggested maintenance push, wherein the suggested maintenance time and the suggested maintenance mode are calculated by the system according to the fault diagnosis information and the health indication information, and the suggested maintenance time and the suggested maintenance mode are matched by the system according to the maintenance mode, and the suggested maintenance push is a required rule item matched by the system according to the maintenance mode and comprises specific item contents of a 'shutdown rule' or a 'maintenance rule' required by the circulating water pump to implement maintenance.
The operation and maintenance personnel can directly check the suggested maintenance scheme in the maintenance scheme decision unit so as to realize accurate maintenance based on the state, reduce the maintenance frequency and cost and improve the service life and the availability ratio of the equipment. For more accurate decision making, the operation and maintenance personnel can check the corresponding input information of the step, including "failure time", "planned overhaul time", "failure position", "failure mode", "remaining usable time" and the table of spare part information (including material code, spare part name, spare part model/specification, stock quantity, etc.). By checking the detailed information, the operation and maintenance personnel decide whether to approve the maintenance decision result, if the pushing content is confirmed, the maintenance information is stored, the maintenance content can be pushed to the maintenance place, and the result of the current maintenance decision is stored in the historical maintenance information.
Examples
The present invention will be described in detail below by taking a slight wear analysis of a guide bearing, which is a key component of a circulating water pump, as an example.
Step (1) on-line monitoring and state evaluation
The current state of the circulating water pump is given as 'abnormal' and is clearly displayed by an orange mark. Clicking an 'output' sub-tab, checking the relevant measuring points of the pump guide bearing in the measuring point list, checking the actual monitoring curve and the simulation curve of the selected measuring points in the 'graph', generating obvious deviation, confirming that the component is in an unhealthy state, and clicking a 'fault diagnosis' tab to enter the step (2).
Step (2) fault diagnosis
The time of fault occurrence is '2021/3/814: 38: 12' (supposition), the part name is 'pump guide bearing' and the part function is 'supporting function and bearing radial load', the fault mode is 'abrasion', the fault reason is 'fatigue', the applicable working condition is 'normal operation', the local influence is 'function reduction' in the fault influence, the high-level influence is 'pump stop', the final influence is 'generated energy reduction even pile stop', the fault symptom and the detection method are 'vibration standard exceeding, sensor detection', and the use compensation is 'none'. And checking the fault diagnosis result of the system by checking the information of 'input', 'output' and 'historical list' in the interface. In the embodiment, three vibration measuring points 'DZC 001', 'DZC 002' and 'DZC 003' related to a pump guide bearing are selected, a spectrogram is checked, the system diagnosis result is judged to be matched with the atlas characteristics according to personal experience, and the next step (3) is carried out.
Step (3) health prediction
The system was checked by looking at the health prediction curve to give a remaining usage time of the part of 9 (+ -1) weeks.
Step (4) maintenance scheme decision
The system pushes the suggested maintenance time and maintenance mode, and operation and maintenance personnel can click the outage procedures and the maintenance procedures in the maintenance pushing process to check specific items required to be referred for completing the maintenance content. By checking and checking the content of the detailed information area, the operation and maintenance personnel can modify the maintenance time, adjust the maintenance mode content according to own experience, and store the maintenance information after confirming all information, wherein the content in the decision process is stored in the historical information, and meanwhile, the maintenance scheme is pushed to the equipment maintenance position.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (15)
1. A nuclear power plant circulating water pump maintenance decision making system is characterized by comprising:
the on-line monitoring and state evaluation unit is used for carrying out real-time on-line monitoring on the circulating water pump and judging the current state grade of the circulating water pump;
the fault diagnosis unit is used for diagnosing and analyzing the circulating water pump and giving out detailed fault information of the circulating water pump;
the health prediction unit is used for predicting the health development trend of the circulating water pump and giving the remaining available time of the current circulating water pump;
and the maintenance scheme decision unit is used for giving a proposal of the maintenance scheme of the circulating water pump according to the fault diagnosis condition, the health trend prediction and the maintenance condition factors of the circulating water pump.
2. The nuclear power plant circulating water pump maintenance decision making system of claim 1, wherein the online monitoring and state evaluation unit comprises a parameter acquisition input module, a monitoring evaluation model module, a parameter curve and state output module;
the parameter acquisition input module acquires and inputs the running parameters of the circulating water pump into the system through a data acquisition instrument, and the running parameters of the circulating water pump are monitored on line;
the monitoring and evaluating model module is used for constructing a monitoring and evaluating model based on historical operating data of the circulating water pump, and calculating through the monitoring and evaluating model to obtain a prediction simulation curve, wherein the prediction simulation curve is a parameter curve of the circulating water pump predicted by the monitoring and evaluating model in a normal operating state;
the parameter curve and state output module displays a prediction simulation curve obtained through calculation of the monitoring and evaluation model and detailed information of an operation parameter curve of the circulating water pump in the current operation state acquired in real time through the sensor, and gives the current state grade of the circulating water pump according to the variation trend of the deviation between the prediction simulation curve and the operation parameter curve of the circulating water pump.
3. The nuclear power plant circulating water pump maintenance decision making system of claim 2, wherein the circulating water pump operating parameters collected by the data collection instrument include vibration parameters and temperature parameters.
4. The nuclear power plant circulating water pump maintenance decision making system of any one of claims 1-3, wherein the current status level of the circulating water pump includes four states of health, early warning, abnormal, and failure.
5. The nuclear power plant circulating water pump maintenance decision making system of claim 1, wherein the circulating water pump fault detail information given by the fault diagnosis unit comprises: the time of fault occurrence, the name and function of the component with fault occurrence, the fault mode, the fault reason, the applicable working conditions, the fault influence, the fault symptom and the inspection method, and the compensation measures which can be taken for ensuring the function of the equipment.
6. The nuclear power plant circulating water pump maintenance decision making system of claim 5, wherein the fault diagnosis unit calculates to obtain feature map information according to operating parameters of the circulating water pump, and a fault mode is correspondingly generated through the feature map.
7. The nuclear power plant circulating water pump maintenance decision making system of claim 1, wherein the health prediction unit utilizes circulating water pump fault performance degradation data acquired by a circulating water pump test bed to construct a prediction model, trains the prediction model, applies the prediction model to a real circulating water pump, and predicts the health development trend and the remaining available time of the circulating water pump based on the collected circulating water pump operation parameters.
8. The nuclear power plant circulating water pump maintenance decision making system of claim 7, wherein the health prediction unit obtains a health prediction curve by calculation, the abscissa is time, the ordinate is a health index indicating a change trend of the health index of the circulating water pump in a future time period, and displays the remaining available time of the component on the curve, so that an operation and maintenance person can judge whether the currently adopted measure is to continue to maintain the operation of the circulating water pump or stop the pump for maintenance according to the time.
9. The nuclear power plant circulating water pump maintenance decision making system of claim 1, wherein the circulating water pump maintenance scenario suggestion given by the maintenance scenario decision making unit comprises: the maintenance method comprises maintenance time, a maintenance mode and maintenance pushing, wherein the maintenance time and the maintenance mode are suggested maintenance time and maintenance modes calculated by the system according to fault information and health indication information, and the maintenance pushing is required rule items matched by the maintenance mode system and comprises shutdown rules required by the maintenance of the circulating water pump or specific item contents of the maintenance rules.
10. A maintenance decision design method for a circulating water pump of a nuclear power plant is characterized by comprising the following steps:
carrying out real-time online monitoring on the circulating water pump, acquiring real-time operation parameters of the circulating water pump, and judging the current state grade of the circulating water pump;
when the current state grade of the circulating water pump is in a non-healthy state, diagnosing and analyzing the circulating water pump, and giving detailed fault information and a historical maintenance list of the circulating water pump;
constructing a prediction model by using the circulating water pump fault performance degradation data acquired by the circulating water pump test bed, predicting the health development trend of the circulating water pump and giving the remaining available time of the current circulating water pump;
and (4) providing a proposal of a circulating water pump maintenance scheme according to fault diagnosis conditions, health development trends, prediction of remaining available time and maintenance condition factors of the circulating water pump.
11. The nuclear power plant circulating water pump maintenance decision-making design method according to claim 10, characterized by calculating a prediction simulation curve through the monitoring and evaluation model when judging the current state grade of the circulating water pump, wherein the prediction simulation curve is a parameter curve of the circulating water pump predicted by the monitoring and evaluation model in the normal operation state; and giving the current state grade of the circulating water pump according to the variation trend of the deviation between the prediction simulation curve of the circulating water pump and the operation parameter curve of the circulating water pump in the current operation state acquired in real time through the sensor.
12. The nuclear power plant circulating water pump maintenance decision-making design method as claimed in claim 11, wherein the current state level of the circulating water pump includes four states of health, early warning, abnormity and fault.
13. The nuclear power plant circulating water pump maintenance decision-making design method according to claim 10, wherein when the circulating water pump is diagnosed and analyzed, characteristic map information is calculated according to operating parameters of the circulating water pump, and a fault mode correspondingly occurs through the characteristic map.
14. The nuclear power plant circulating water pump maintenance decision-making design method of claim 10, wherein if the fault cause cannot be given through fault diagnosis, an expert decision-making system can be entered to determine the fault cause based on expert experience.
15. The nuclear power plant circulating water pump maintenance decision-making design method as claimed in claim 10, wherein an operation and maintenance person realizes accurate maintenance based on the current state grade by checking a recommended circulating water pump maintenance scheme, and decides whether to approve the maintenance decision-making result by checking corresponding input information including failure time, scheduled overhaul time, failure location, failure mode, remaining available time and spare part information.
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