A method and system for evaluating the hydraulic performance of pumps in important water systems of nuclear power plants

Abstract

The present invention relates to a method and system for evaluating the hydraulic performance of pumps in important plant water systems of nuclear power plants, comprising: collecting raw data from hydraulic characteristic tests of pumps in important plant water systems of nuclear power plants; analyzing and calculating the raw data to obtain a theoretical model for analyzing changes in pump performance parameters of the important plant water systems; calculating the raw data to obtain a pump performance evaluation standard; evaluating daily performance changes of pumps in important plant water systems based on the theoretical model for analyzing changes in pump performance parameters; and evaluating performance deviations of pumps in important plant water systems based on the pump performance evaluation standard. The present invention predicts daily performance change trends of pumps in important plant water systems by establishing a theoretical model for analyzing changes in pump performance parameters based on seawater tide levels. At the same time, the pump performance is evaluated based on the determined pump performance evaluation standard, thereby achieving continuous monitoring and performance prediction of the pump performance and resolving the problem that only using the pump factory test evaluation standard is inapplicable to pump performance prediction.

Description

Technical Field

[0001] The present invention relates to the technical field of water systems in nuclear power plants, and more particularly to a method and system for evaluating the hydraulic performance of pumps in important plant water systems in nuclear power plants. Background Art

[0002] The hydraulic performance of important pumps in nuclear power plants needs to be monitored regularly to meet the safe operation requirements of the power plant. These important pumps play the important role of cooling the power plant. The hydraulic characteristics of the pumps (such as head, effective cavitation margin, shaft power, and efficiency) need to be tested and monitored regularly to ensure that the pump performance has not degraded.

[0003] The existing pump characteristic test evaluation method has the following problems:

[0004] The external environment interferes with the pump performance evaluation, especially the influence of seawater tide level on the performance parameters of the important plant water system (SEC) pump is uncertain; the existing pump performance tracking and evaluation method is based on the pump factory test evaluation standard and is not suitable for regular test evaluation after commercial operation. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method and system for evaluating the hydraulic performance of pumps in an important plant water system of a nuclear power plant.

[0006] The technical solution adopted by the present invention to solve the technical problem is to construct a method for evaluating the hydraulic performance of pumps in an important water system of a nuclear power plant, comprising the following steps:

[0007] Collecting original data from pump hydraulic characteristic tests of important water systems in nuclear power plants;

[0008] Analyze and calculate the raw data to obtain a theoretical model for analyzing changes in pump performance parameters of important plant water systems;

[0009] Calculating the raw data to obtain a pump performance evaluation standard;

[0010] Evaluate daily performance changes of important plant water system pumps based on the pump performance parameter change analysis theoretical model;

[0011] The performance deviation of important plant water system pumps is evaluated based on the pump performance evaluation standard.

[0012] In the hydraulic performance evaluation method of the pumps of the important service water system of a nuclear power plant according to the present invention, the original data includes: multiple groups of pump operation data of the important service water system of the nuclear power plant;

[0013] Each set of pump operation data includes: pump operation data collected for one day.

[0014] In the hydraulic performance evaluation method for the pumps of the important plant water system of a nuclear power plant according to the present invention, the analysis and calculation of the raw data to obtain a theoretical model for analyzing the change in performance parameters of the pumps of the important plant water system includes:

[0015] Analyze and calculate the operating data of each group of pumps to obtain the performance results of each group of pumps;

[0016] Based on the performance results of each group of pumps, the corresponding relationship between the pump performance results and the seawater tide level is obtained; the corresponding relationship between the pump performance results and the seawater tide level is the theoretical model for analyzing the change of the pump performance parameters.

[0017] In the hydraulic performance evaluation method for the pumps of the important plant water system of a nuclear power plant according to the present invention, the analysis and calculation of each set of pump operating data to obtain the performance results of each set of pumps includes:

[0018] The pump performance results are calculated every hour, and the average value of 5 minutes of continuous data per hour is used to obtain the performance results of each group of pumps.

[0019] In the hydraulic performance evaluation method for the important plant water system pump of a nuclear power plant described in the present invention, the corresponding relationship between the pump performance results and the seawater tide level includes:

[0020] The pump flow, pump inlet pressure and pump effective NPSH increase with the increase of seawater tide level.

[0021] In the method for evaluating the hydraulic performance of a pump in an important plant water system of a nuclear power plant according to the present invention, the calculation of the raw data to obtain the pump performance evaluation criteria includes:

[0022] Analyze and calculate the operating data of each group of pumps to obtain the performance results of each group of pumps;

[0023] The performance results of each group of pumps were averaged to obtain the pump performance benchmark point;

[0024] A performance deviation range is set based on the pump performance reference point; the pump performance reference point and the performance deviation range are the pump performance evaluation criteria.

[0025] In the hydraulic performance evaluation method for the pumps of the important plant water system of a nuclear power plant according to the present invention, the analysis and calculation of each set of pump operating data to obtain the performance results of each set of pumps includes:

[0026] The pump performance results are calculated every hour, and the average value of 5 minutes of continuous data per hour is used to obtain the performance results of each group of pumps;

[0027] The averaging of the performance results of each group of pumps to obtain the pump performance benchmark includes:

[0028] The performance results of each group of pumps are averaged to obtain the pump performance benchmark point.

[0029] The present invention also provides a hydraulic performance evaluation system for pumps in an important plant water system of a nuclear power plant, comprising:

[0030] Data acquisition unit, used to collect original data from the pump hydraulic characteristics test of important plant water systems in nuclear power plants;

[0031] A theoretical model building unit is used to analyze and calculate the original data to obtain a theoretical model for analyzing changes in pump performance parameters of important plant water systems;

[0032] An evaluation standard determination unit, configured to calculate the raw data to obtain a pump performance evaluation standard;

[0033] A change trend evaluation unit, configured to evaluate daily performance changes of important plant water system pumps based on the pump performance parameter change analysis theoretical model;

[0034] A performance evaluation unit is used to evaluate the performance deviation of important plant water system pumps based on the pump performance evaluation standard.

[0035] The present invention also provides a storage medium storing a computer program suitable for loading by a processor to execute the steps of the above-mentioned method for evaluating the hydraulic performance of pumps in an important plant water system of a nuclear power plant.

[0036] The present invention also provides an electronic device comprising a memory and a processor, wherein the memory stores a computer program, and the processor executes the steps of the above-mentioned method for evaluating the hydraulic performance of pumps in an important plant water system of a nuclear power plant by calling the computer program stored in the memory.

[0037] The method and system for evaluating the hydraulic performance of pumps in important plant water systems of nuclear power plants according to the present invention have the following beneficial effects: including: collecting raw data from hydraulic characteristic tests of pumps in important plant water systems of nuclear power plants; analyzing and calculating the raw data to obtain a theoretical model for analyzing changes in pump performance parameters of the important plant water systems; calculating the raw data to obtain a pump performance evaluation standard; evaluating daily performance changes of pumps in important plant water systems based on the theoretical model for analyzing changes in pump performance parameters; and evaluating performance deviations of pumps in important plant water systems based on the pump performance evaluation standard. The present invention predicts daily performance change trends of pumps in important plant water systems by establishing a theoretical model for analyzing changes in pump performance parameters based on seawater tide levels. At the same time, the pump performance is evaluated based on the determined pump performance evaluation standard, thereby achieving continuous monitoring and performance prediction of the pump performance and resolving the problem that only using the pump factory test evaluation standard is not applicable to pump performance prediction. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0039] Figure 1 This is a flow chart of a method for evaluating the hydraulic performance of pumps in an important plant water system of a nuclear power plant provided by an embodiment of the present invention;

[0040] Figure 2 Schematic diagram of the corresponding relationship between the inlet pressure of the 1SEC003PO pump and the seawater tide level provided in an embodiment of the present invention;

[0041] Figure 3 Schematic diagram of the corresponding relationship between the inlet pressure of the 6SEC002PO pump provided in an embodiment of the present invention and the seawater tide level;

[0042] Figure 4 This is a graph showing the corresponding relationship between the flow rate of the 1SEC003PO pump and the seawater tide level provided in an embodiment of the present invention;

[0043] Figure 5 This is a graph showing the corresponding relationship between the flow rate of the 6SEC002PO pump and the seawater tide level provided in an embodiment of the present invention;

[0044] Figure 6 This is a daily trend chart of the effective NPSH of the 1SEC003PO pump provided in an embodiment of the present invention;

[0045] Figure 7 This is a daily trend chart of the effective NPSH of the 6SEC002PO pump provided in an embodiment of the present invention;

[0046] Figure 8 This is a daily performance trend chart of the 1SEC003PO pump provided by an embodiment of the present invention, comparing the performance of the pump from correction to factory delivery;

[0047] Figure 9 This is a daily performance trend chart comparing the performance of the 6SEC002PO pump provided by an embodiment of the present invention from correction to factory delivery. DETAILED DESCRIPTION

[0048] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0049] refer to Figure 1The present invention provides a preferred embodiment of a method for evaluating the hydraulic performance of pumps in an important plant water system of a nuclear power plant.

[0050] Specifically, such as Figure 1 As shown, the hydraulic performance evaluation method of the important plant water system pump of the nuclear power plant includes the following steps:

[0051] Step S10: collecting original data of the pump hydraulic characteristic test of the important plant water system of the nuclear power plant.

[0052] Optionally, in an embodiment of the present invention, the collected original data of the pump hydraulic characteristics test includes: multiple sets of pump operation data of important plant water systems of nuclear power plants; wherein, each set of pump operation data includes: pump operation data collected continuously for one day.

[0053] Furthermore, the pump operation data includes data on multiple parameters, specifically including: data on pump inlet pressure, pump outlet pressure, pump flow rate, pump speed, motor current, motor voltage, etc. Therefore, each set of pump operation data includes data on multiple parameters, namely, data on pump inlet pressure, pump outlet pressure, pump flow rate, pump speed, motor current, motor voltage, etc. Each parameter data includes multiple sets of data.

[0054] Step S20: Analyze and calculate the original data to obtain a theoretical model for analyzing changes in pump performance parameters of important plant water systems.

[0055] In an embodiment of the present invention, the analysis and calculation of the original data to obtain a theoretical model for analyzing changes in pump performance parameters of an important plant water system includes: analyzing and calculating each set of pump operation data to obtain performance results for each set of pumps; analyzing based on the performance results of each set of pumps to obtain a correspondence between the pump performance results and the seawater tide level; the correspondence between the pump performance results and the seawater tide level is the theoretical model for analyzing changes in pump performance parameters.

[0056] The analyzing and calculating each set of pump operation data to obtain the performance results of each set of pumps includes calculating the pump performance results once every hour, and using the average value of 5 minutes of continuous data per hour to obtain the performance results of each set of pumps.

[0057] Specifically, by continuously collecting pump operation data for one day and calculating pump performance results every hour, a total of 24 sets of data are collected per day. Each set of data is analyzed and calculated to obtain each set of pump performance results, including pump head, pump shaft power, pump efficiency, and pump effective NPSH. These 24 sets of data include pump inlet pressure data, pump outlet pressure data, pump flow data, pump speed data, motor current data, and motor voltage data.

[0058] Pump performance results are calculated every hour, using the average of 5 minutes of continuous data per hour. For example, taking the pump inlet pressure as an example, if data is collected once at 1:00 PM, the pump inlet pressure is continuously collected for 5 minutes from 1:00 PM to 1:00 PM. The average of these multiple pump inlet pressure data is then used as the data for pump performance calculation.

[0059] Specifically, centrifugal pumps are generally driven by an electric motor. Before starting, the shell needs to be filled with the liquid to be transported. After starting the motor, the pump shaft drives the impeller to rotate together, and the liquid between the blades also rotates. Under the action of centrifugal force, the liquid gains energy in the process of being warmed from the center of the impeller to the outer edge, which increases the static pressure of the liquid at the outer edge of the impeller and also increases the flow rate.

[0060] Among them, the pump head: that is, the increase in energy obtained when a unit weight of liquid passes through the pump, is expressed by H, and the unit is m, which can be calculated by the following formula:

[0061]

[0062] (1) In the formula, H represents the head; Z1 represents the height of the medium pressure measuring point at the pump inlet; Z2 represents the height of the medium pressure measuring point at the pump outlet; V1 represents the medium velocity at the pump inlet; V2 represents the medium velocity at the pump outlet; g represents the acceleration of gravity; P1 represents the medium pressure at the pump inlet; P2 represents the medium pressure at the pump outlet; and ρ represents the medium density.

[0063] The effective NPSH of the pump is the excess capacity of the unit weight of fluid at the suction port of the pump that exceeds the vaporization force, that is, NPSH aw , which can be calculated by the following formula:

[0064]

[0065] (2) In the formula, NPSH aw represents the effective cavitation margin; P represents the pump medium pressure; ρ represents the medium density; g represents the acceleration of gravity; P s It indicates the saturated water pressure corresponding to the pump medium temperature; V indicates the pump medium flow rate.

[0066] By analyzing and calculating the pump performance results from a single day's data, we can then establish a corresponding relationship between the pump performance results and the seawater tide level. This relationship includes the relationship between the pump inlet pressure and the seawater tide level, the relationship between the pump flow rate and the seawater tide level, and the relationship between the pump's effective NPSH and the seawater tide level.

[0067] Furthermore, to ensure the accuracy of the data, the daily data of the pump over a period of time can be analyzed and calculated. For example, the daily data of the pump can be collected for a month, and then the data collected every day can be analyzed and calculated according to the above method to obtain the pump performance results for each day. Then, combined with the seawater tide level conditions of each day, it can be sorted and analyzed to obtain: after correction to the factory output, the head deviation, shaft power deviation, and efficiency deviation are all unrelated to the seawater tide level, while the seawater tide level directly affects the pump inlet pressure and pump flow.

[0068] Optionally, in an embodiment of the present invention, the correspondence between the pump performance results and the seawater tide level includes: the pump flow rate, pump inlet pressure, and pump effective NPSH increase with the increase of the seawater tide level. Specifically, the correspondence between the pump flow rate and the seawater tide level is: the pump flow rate increases with the increase of the seawater tide level; the correspondence between the pump inlet pressure and the seawater tide level is: the pump inlet pressure increases with the increase of the seawater tide level; and the correspondence between the pump effective NPSH and the seawater tide level is: the pump effective NPSH increases with the increase of the seawater tide level. That is, when the seawater tide level increases, the pump flow rate, pump inlet pressure, and pump effective NPSH increase synchronously.

[0069] In order to verify the reliability of the corresponding relationship, it is verified through specific measured data, such as Figures 2 to 7 As shown in the figure, the corresponding relationship diagrams of the measured inlet pressure and seawater tide level of the 1SEC003PO pump and the 6SEC002PO pump and the corresponding relationship diagrams of the measured flow rate and seawater tide level are given respectively. Figures 2 to 7 It can be seen that the inlet pressure, flow rate and effective NPSH of the pump increase with the increase of seawater tide level.

[0070] Furthermore, in embodiments of the present invention, when calculating pump performance results, a correction can be made to the seawater tide level. After correction to the same tide level, the pump flow rates are compared to see if they are consistent. If the flow rates are the same, the pump flow measurement is accurate. If the pump flow rates differ significantly after correction to the same tide level, it indicates that the flow measurement has deviated, and the flow meter needs to be inspected. This method can assist in determining whether the pump flow meter has deviated, facilitates eliminating other factors that affect the evaluation of the pump's hydraulic performance, and improves the accuracy of the pump characteristic test evaluation.

[0071] Based on the above analysis, we can get the mechanism of the influence of seawater tide on various pump parameters and performance, namely: when the seawater tide rises, the inlet pressure of the important plant water system (SEC) pump increases synchronously, the effective cavitation margin of the pump increases, and the pump outlet pressure increases. However, after correcting to the same speed, the pump head, shaft power, and efficiency remain unchanged. Among them, the daily change trend of various pump performances is compared with the factory curve. Figure 8 and Figure 9 shown.

[0072] Step S30: Calculate the original data to obtain a pump performance evaluation standard.

[0073] In an embodiment of the present invention, calculating the raw data to obtain a pump performance evaluation standard includes: analyzing and calculating each set of pump operating data to obtain a performance result for each set of pumps; averaging the performance results for each set of pumps to obtain a pump performance benchmark point; and setting a performance deviation range based on the pump performance benchmark point. The pump performance benchmark point and the performance deviation range constitute the pump performance evaluation standard.

[0074] Specifically, analyzing and calculating each set of pump operating data to obtain the performance results for each pump group includes calculating the pump performance results once every hour, using an average of 5 minutes of continuous data per hour to obtain the performance results for each pump group. It should be noted that the performance results for each pump group are calculated using the same method as in step S20.

[0075] In the embodiment of the present invention, performing mean processing on the performance results of each group of pumps to obtain the pump performance benchmark point includes: performing mean calculation on the performance results of each group of pumps to obtain the pump performance benchmark point.

[0076] Specifically, as described above, taking the example of collecting one day's pump operation data, 24 sets of data are collected in that day, resulting in 24 sets of pump performance results, namely, 24 pump head values, 24 pump shaft power values, 24 pump efficiency values, and 24 pump effective NPSH values. Taking the pump head as an example, summing the 24 pump head values ​​and dividing them by 24 yields the average pump head value, which serves as the pump head benchmark. Similarly, benchmarks for several other parameters (the pump efficiency benchmark, the pump shaft power benchmark, and the pump effective NPSH benchmark) can be obtained. By setting a corresponding deviation range (i.e., upper and lower limits) for each parameter, evaluation criteria for each parameter can be derived, namely, the head evaluation criteria, efficiency evaluation criteria, shaft power evaluation criteria, and effective NPSH evaluation criteria.

[0077] Step S40: Evaluate daily performance changes of important plant water system pumps based on the pump performance parameter change analysis theoretical model.

[0078] Specifically, after obtaining the correspondence between the pump inlet pressure and the seawater tide level and the correspondence between the pump flow rate and the seawater tide level in step S20, the changes in the pump inlet pressure and flow rate during the day can be predicted and judged based on the correspondence between the pump inlet pressure and the seawater tide level and the correspondence between the pump flow rate and the seawater tide level.

[0079] Step S50: Evaluate the performance deviation of important plant water system pumps based on the pump performance evaluation standard.

[0080] Specifically, after obtaining the evaluation criteria for each parameter in step S40, the pump performance deviation can be evaluated based on the obtained evaluation criteria for each parameter. For example, taking the pump head as an example, if the deviation between the actual head and the head reference point is not within the deviation range, the pump operation is judged to be unreliable, and a corresponding warning can be issued. If the deviation between the actual head and the head reference point is within the deviation range, the pump operation is judged to be reliable.

[0081] The present invention uses average values ​​to process collected data, effectively solving the problem of pump performance fluctuations in different time periods. Through analysis and calculation, the influence mechanism and related factors of seawater tide level on various pump parameters and performance are obtained. At the same time, a SEC pump performance benchmark point is established, and the SEC pump performance evaluation method is optimized.

[0082] In addition, since the SEC pump characteristic test cycle is frequent and the workload is large, the evaluation method based on the present invention can reduce the frequent analysis and evaluation workload of relevant personnel and greatly reduce the labor input cost.

[0083] This paper successfully predicts daily performance trends of SEC pumps by establishing a theoretical model for analyzing the effects of seawater tide levels on pump performance parameters. The proposed pump performance benchmark, combined with a deviation range, enables precise evaluation of pump performance deviations, improving the accuracy of hydraulic performance test results for critical nuclear power plant pumps and further enhancing the ability to continuously monitor and predict the performance of these pumps.

[0084] The present invention also provides a hydraulic performance evaluation system for pumps in an important plant water system of a nuclear power plant, comprising:

[0085] The data acquisition unit is used to collect the original data of the pump hydraulic characteristics test of the important plant water system of the nuclear power plant.

[0086] The theoretical model building unit is used to analyze and calculate the original data to obtain a theoretical model for analyzing changes in pump performance parameters of important plant water systems.

[0087] The evaluation standard determination unit is used to calculate the original data to obtain the pump performance evaluation standard.

[0088] The change trend evaluation unit is used to evaluate the daily performance changes of the important plant water system pumps based on the pump performance parameter change analysis theoretical model.

[0089] A performance evaluation unit is used to evaluate the performance deviation of important plant water system pumps based on the pump performance evaluation standard.

[0090] Specifically, the specific coordination operation process between the various units in the hydraulic performance evaluation system of the important plant water system pump of the nuclear power plant can refer to the above-mentioned hydraulic performance evaluation method of the important plant water system pump of the nuclear power plant, which will not be repeated here.

[0091] In addition, an electronic device of the present invention includes a memory and a processor; the memory is used to store a computer program; the processor is used to execute the computer program to implement any of the above methods for evaluating the hydraulic performance of pumps in important plant water systems of nuclear power plants. Specifically, according to an embodiment of the present invention, the process described with reference to the flowchart above can be implemented as a computer software program. For example, an embodiment of the present invention includes a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program contains program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed by an electronic device and, when executed, performs the above functions defined in the method of the embodiment of the present invention. The electronic device in the present invention can be a terminal such as a notebook, desktop, tablet computer, smart phone, or a server.

[0092] In addition, the present invention provides a storage medium having a computer program stored thereon, which, when executed by a processor, implements any of the above-mentioned methods for evaluating the hydraulic performance of a pump in a nuclear power plant's important plant water system. Specifically, it should be noted that the storage medium of the present invention may be a computer-readable signal medium or a computer-readable storage medium, or any combination thereof. Computer-readable storage media may be, for example, but not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or components, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection having one or more wires, a portable computer disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In the present invention, a computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, device, or component. In the present invention, a computer-readable signal medium may include a data signal transmitted in baseband or as part of a carrier wave, which carries computer-readable program code. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination thereof. A computer-readable signal medium may also be any computer-readable medium other than a computer-readable storage medium that can send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device. The program code contained on the computer-readable medium may be transmitted using any suitable medium, including but not limited to wires, optical cables, RF (radio frequency), etc., or any suitable combination thereof.

[0093] The computer-readable medium may be included in the electronic device, or may exist independently without being incorporated into the electronic device.

[0094] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0095] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the components and steps of each example according to their functions. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present invention.

[0096] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0097] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the present invention and implement it accordingly. They are not intended to limit the scope of protection of the present invention. All equivalent variations and modifications within the scope of the claims of the present invention are intended to be covered by the claims of the present invention.

Claims

1. A method for evaluating the hydraulic performance of pumps in an important water system of a nuclear power plant, characterized in that: The following steps are involved: Collecting original data from pump hydraulic characteristic tests of important water systems in nuclear power plants; Analyze and calculate the raw data to obtain a theoretical model for analyzing changes in pump performance parameters of important plant water systems; The analyzing and calculating the raw data to obtain a theoretical model for analyzing changes in pump performance parameters of an important plant water system includes: analyzing and calculating each set of pump operating data to obtain performance results for each set of pumps; analyzing the performance results for each set of pumps to obtain a corresponding relationship between the pump performance results and the seawater tide level; the corresponding relationship between the pump performance results and the seawater tide level is the theoretical model for analyzing changes in pump performance parameters; the corresponding relationship between the pump performance results and the seawater tide level includes: pump flow, pump inlet pressure, and pump effective NPSH increase with increasing seawater tide level; Calculating the raw data to obtain a pump performance evaluation standard; Evaluate daily performance changes of important plant water system pumps based on the pump performance parameter change analysis theoretical model; The performance deviation of important plant water system pumps is evaluated based on the pump performance evaluation standard.

2. The method for evaluating the hydraulic performance of pumps in an important water system of a nuclear power plant according to claim 1, characterized in that: The original data includes: multiple sets of pump operation data of important plant water systems of nuclear power plants; Each set of pump operation data includes: pump operation data collected for one day.

3. The method for evaluating the hydraulic performance of pumps in an important water system of a nuclear power plant according to claim 1, characterized in that: The analysis and calculation of each set of pump operation data to obtain the performance results of each set of pumps includes: The pump performance results are calculated every hour, and the average value of 5 minutes of continuous data per hour is used to obtain the performance results of each group of pumps.

4. The method for evaluating the hydraulic performance of pumps in an important water system of a nuclear power plant according to claim 2, characterized in that: The calculation of the raw data to obtain the pump performance evaluation standard includes: Analyze and calculate the operating data of each group of pumps to obtain the performance results of each group of pumps; The performance results of each group of pumps were averaged to obtain the pump performance benchmark point; A performance deviation range is set based on the pump performance reference point; the pump performance reference point and the performance deviation range are the pump performance evaluation criteria.

5. The method for evaluating the hydraulic performance of pumps in an important water system of a nuclear power plant according to claim 4, characterized in that: The analysis and calculation of each set of pump operation data to obtain the performance results of each set of pumps includes: The pump performance results are calculated every hour, and the average value of 5 minutes of continuous data per hour is used to obtain the performance results of each group of pumps; The averaging of the performance results of each group of pumps to obtain the pump performance benchmark includes: The performance results of each group of pumps are averaged to obtain the pump performance benchmark point.

6. A nuclear power plant important water system pump hydraulic performance evaluation system, characterized by: include: Data acquisition unit, used to collect original data from the pump hydraulic characteristics test of important plant water systems in nuclear power plants; A theoretical model building unit is used to analyze and calculate the original data to obtain a theoretical model for analyzing changes in pump performance parameters of important plant water systems; The analyzing and calculating the raw data to obtain a theoretical model for analyzing changes in pump performance parameters of an important plant water system includes: analyzing and calculating each set of pump operating data to obtain performance results for each set of pumps; analyzing the performance results for each set of pumps to obtain a corresponding relationship between the pump performance results and the seawater tide level; the corresponding relationship between the pump performance results and the seawater tide level is the theoretical model for analyzing changes in pump performance parameters; the corresponding relationship between the pump performance results and the seawater tide level includes: pump flow, pump inlet pressure, and pump effective NPSH increase with increasing seawater tide level; An evaluation standard determination unit, configured to calculate the raw data to obtain a pump performance evaluation standard; A change trend evaluation unit, configured to evaluate daily performance changes of important plant water system pumps based on the pump performance parameter change analysis theoretical model; A performance evaluation unit is used to evaluate the performance deviation of important plant water system pumps based on the pump performance evaluation standard.

7. A storage medium, characterized in that: The storage medium stores a computer program, which is suitable for being loaded by a processor to execute the steps of the method for evaluating the hydraulic performance of a pump in an important plant water system of a nuclear power plant as described in any one of claims 1 to 5.

8. An electronic device, characterized in that: It includes a memory and a processor, wherein a computer program is stored in the memory, and the processor executes the steps of the method for evaluating the hydraulic performance of pumps in an important plant water system of a nuclear power plant as described in any one of claims 1 to 5 by calling the computer program stored in the memory.

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