Method for evaluating performance of pump under constant-flow working condition of nuclear power station

Abstract

The invention particularly relates to a nuclear power station constant flow working condition pump performance evaluation method, which comprises the following steps of: obtaining an inlet pressure value and an outlet pressure value of a constant flow working condition pump in a previous time period, and calculating an inlet and outlet pressure correlation coefficient of the constant flow working condition pump in the previous time period; an inlet pressure value and an actual outlet pressure value of the constant-flow working condition pump in the next time period are obtained, and an inlet and outlet pressure correlation coefficient of the constant-flow working condition pump in the next time period is calculated; the inlet and outlet pressure correlation coefficient of the constant-flow working condition pump in the previous time period is compared with the inlet and outlet pressure correlation coefficient of the constant-flow working condition pump in the next time period, and the performance index of the constant-flow working condition pump is obtained; and the performance change trend of the constant-flow working condition pump is judged according to the performance indexes of the constant-flow working condition pump. The invention further relates to a nuclear power station constant flow working condition pump performance evaluation device, computer equipment and a storage medium. According to the invention, low-cost, high-efficiency and high-precision detection of the constant-flow working condition pump performance is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of performance evaluation of nuclear power plant constant flow working condition pumps, and in particular to a nuclear power plant constant flow working condition pump performance evaluation method, device, computer equipment and computer readable storage medium. Background Art

[0002] At present, the performance evaluation of the constant flow working condition pump of a nuclear power plant is to add a vibration sensor and a corresponding transmission cable to the pump shaft of the constant flow working condition pump, collect the vibration acceleration of the constant flow working condition pump, and calculate the effective value of the constant flow working condition pump to perform performance evaluation. This evaluation method requires the addition of vibration sensors and corresponding transmission cables, which is too costly. Summary of the invention

[0003] The purpose of the present invention is to provide a method, device, computer equipment and computer-readable storage medium for evaluating the performance of a constant flow condition pump in a nuclear power plant, so as to solve the problem of high cost of the existing method for evaluating the performance of a constant flow condition pump in a nuclear power plant, and to evaluate the performance of a constant flow condition pump by using the inlet and outlet pressure data of the constant flow condition pump, with low cost.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A method for evaluating the performance of a nuclear power plant constant flow condition pump comprises the following steps:

[0006] Get the actual inlet pressure value X and the actual outlet pressure value Y of the constant flow working condition pump in the previous time period j, and calculate the actual inlet and outlet pressure correlation coefficient of the constant flow working condition pump in the previous time period j

[0007] Get the actual inlet pressure value X' and the actual outlet pressure value Y' of the constant flow working condition pump in the next time period j', and calculate the actual inlet and outlet pressure correlation coefficient of the constant flow working condition pump in the next time period j'

[0008] Compare the correlation coefficients of the actual inlet and outlet pressures of the constant flow pump in the previous time period j Correlation coefficient between the actual inlet and outlet pressures and the next time period j' Obtain the performance index η of the constant flow working condition pump;

[0009] The performance change trend of the constant flow working condition pump is determined according to the performance index η of the constant flow working condition pump.

[0010] As one of the feasible ways, the actual inlet pressure value x of each measuring point i in the previous time period j of the constant flow working condition pump is obtained. i And the actual outlet pressure value y i, forming the actual inlet pressure value X and the actual outlet pressure value Y of the constant flow working condition pump in the previous time period j; i = 1, 2, ..., n; the actual inlet pressure value X of the constant flow working condition pump in the previous time period j = (x1, x2, ..., x n ); the actual outlet pressure value Y of the constant flow pump in the previous time period j = (y1, y2, ..., y n ).

[0011] As one of the feasible ways, calculate the actual inlet and outlet pressure correlation coefficient of the constant flow condition pump in the previous time period j The steps include:

[0012] Calculate the actual inlet pressure average value E(X) and the actual outlet pressure average value E(Y) of the constant flow working condition pump in the previous time period j;

[0013] Calculate the actual inlet pressure variance value D(X) and the actual outlet pressure variance value D(Y) of the constant flow condition pump in the previous time period j;

[0014] Calculate the actual inlet and outlet pressure covariance value Cov(X,Y) of the constant flow condition pump in the previous time period j;

[0015] Calculate the correlation coefficient of the actual inlet and outlet pressures of the constant flow pump in the previous time period j

[0016] As one of the possible ways to achieve this, the average actual inlet pressure of the constant flow pump in the previous time period j The average actual outlet pressure of the constant flow pump in the previous time period j The actual inlet pressure variance value of the constant flow pump in the previous time period j is D(X)=E{[XE(X)] 2}; The actual outlet pressure variance value of the constant flow pump in the previous time period j D(Y)=E{[YE(Y)] 2}; Covariance value of the actual inlet and outlet pressures of the constant flow working condition pump in the previous time period j Cov(X,Y)=E{[XE(X)][YE(Y)]}; Correlation coefficient of the actual inlet and outlet pressures of the constant flow working condition pump in the previous time period j

[0017] As one of the feasible ways, the actual inlet pressure value x' of each measuring point i' in the next time period j' of the constant flow working condition pump is obtained. i And the actual outlet pressure value y' i, forming the actual inlet pressure value X' and the actual outlet pressure value Y' of the constant flow working condition pump in the next time period j'; i'=1,2,...n; the actual inlet pressure value X' of the constant flow working condition pump in the next time period j'=(x'1,x'2,...,x' n ); the actual outlet pressure value Y'=(y'1,y'2,...,y' n ).

[0018] As one of the feasible ways, calculate the actual inlet and outlet pressure correlation coefficient of the constant flow condition pump in the next time period j' The steps include:

[0019] Calculate the actual inlet pressure mean value E(X') and the actual outlet pressure mean value E(Y') in the next time period j' of the constant flow condition pump;

[0020] Calculate the actual inlet pressure variance value D(X') and the actual outlet pressure variance value D(Y') of the constant flow condition pump in the next time period j';

[0021] Calculate the actual inlet and outlet pressure covariance value Cov(X',Y') of the constant flow condition pump in the next time period j';

[0022] Calculate the actual inlet and outlet pressure correlation coefficient of the constant flow condition pump in the next time period j'

[0023] As one of the possible ways to achieve this, the actual inlet pressure average of the constant flow pump in the next time period j' The actual average outlet pressure of the constant flow pump in the next time period j' The actual inlet pressure variance value of the constant flow pump in the next time period j' is D(X')=E{[X'-E(X')] 2}; The actual outlet pressure variance value of the constant flow pump in the next time period j' is D(Y')=E{[Y'-E(Y')] 2}; The actual inlet and outlet pressure covariance value Cov(X',Y')=E{[X'-E(X')][Y'-E(Y')]} of the constant flow working condition pump in the next time period j'; The actual inlet and outlet pressure correlation coefficient of the constant flow working condition pump in the next time period j'

[0024] As one of the feasible methods, the performance index of the constant flow condition pump

[0025] As one of the achievable methods, judging the performance change trend of the constant flow working condition pump according to the performance index η of the constant flow working condition pump includes the following steps:

[0026] When 5%<the performance index η of the constant flow working condition pump≤10%, a first-level alarm is issued to remind the staff to pay attention to the changing trend of the performance index η of the constant flow working condition pump and judge the performance changing trend of the constant flow working condition pump according to the changing trend of the performance index η of the constant flow working condition pump;

[0027] When the performance index η of the constant flow working pump is greater than 10%, a secondary alarm is issued to remind the staff to check the bearing temperature parameters and vibration parameters of the constant flow working pump, and judge the operation problems of the constant flow working pump based on the bearing temperature parameters and vibration parameters of the constant flow working pump.

[0028] The present invention also provides a nuclear power plant constant flow pump performance evaluation device, comprising:

[0029] An acquisition module is used to acquire an actual inlet pressure value X and an actual outlet pressure value Y of a constant flow working condition pump in a previous time period j and an actual inlet pressure value X' and an actual outlet pressure value Y' in a next time period j';

[0030] The calculation module is used to calculate the actual inlet and outlet pressure correlation coefficient of the constant flow condition pump in the previous time period j And the actual inlet and outlet pressure correlation coefficient in the next time period j'

[0031] Comparison module, used to compare the actual inlet and outlet pressure correlation coefficients of the constant flow condition pump in the previous time period j Correlation coefficient between the actual inlet and outlet pressures and the next time period j' Obtain the performance index η of the pump under constant flow condition;

[0032] The evaluation module is used to determine the performance change trend of the constant flow working condition pump according to the performance index η of the constant flow working condition pump.

[0033] The present invention also provides a computer device, including a memory and a processor, wherein the memory stores computer-readable instructions, and when the processor executes the computer-readable instructions, the steps of the above-mentioned nuclear power plant constant flow pump performance evaluation method are implemented.

[0034] In order to solve the above technical problems, the present invention provides a computer-readable storage medium, on which computer-readable instructions are stored. When the computer-readable instructions are executed, the steps of the above-mentioned nuclear power plant constant flow pump performance evaluation method are implemented.

[0035] Beneficial technical effects of the present invention:

[0036] The nuclear power plant constant flow pump performance evaluation method, device, computer equipment and computer-readable storage medium of the present invention do not need to add other equipment, do not affect the normal operating state of the constant flow working condition pump, use the existing inlet and outlet pressure gauges of the constant flow working condition pump to continuously obtain the inlet and outlet pressure values ​​of the constant flow working condition pump, and the cost is low; by comparing the inlet and outlet pressure correlation coefficients of the constant flow working condition pump in the previous time period and the next time period, the performance index of the constant flow working condition pump is obtained in real time, reducing the measurement time; the performance change trend of the constant flow working condition pump is judged according to the performance index of the constant flow working condition pump, and the detection accuracy is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural schematic diagram of an embodiment of a conventional constant flow pump for a nuclear power plant;

[0038] Figure 2 A flowchart of an embodiment of a method for evaluating performance of a constant flow pump in a nuclear power plant according to the present invention;

[0039] Figure 3 It is a schematic structural view of an embodiment of a nuclear power plant constant flow pump performance evaluation device of the present invention.

[0040] Figure 4 The figure is a schematic structural view of a computer device according to an embodiment of the present invention.

[0041] In the figure, 1. first pressure gauge; 2. constant flow working pump; 3. second pressure gauge; 4. flow meter. DETAILED DESCRIPTION

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned figure descriptions are intended to cover non-exclusive inclusions.

[0043] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations 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.

[0044] The technical solution of the present invention is clearly and completely described below in conjunction with the accompanying drawings and specific embodiments.

[0045] refer to Figure 1In a nuclear power plant, a first pressure gauge 1 is provided at the inlet of a constant flow working condition pump 2, and a second pressure gauge 3 and a flow meter 4 are provided at the outlet.

[0046] refer to Figure 2 , showing a flow chart of an embodiment of a performance evaluation method for a constant flow condition pump of a nuclear power plant, the method does not require the addition of other equipment, does not affect the normal operating state of the constant flow condition pump 2, utilizes the existing inlet and outlet pressure gauges of the constant flow condition pump 2, continuously obtains the inlet and outlet pressure values ​​of the constant flow condition pump 2, and has low cost; by comparing the inlet and outlet pressure correlation coefficients of the constant flow condition pump 2 in the previous time period and the next time period, the performance index of the constant flow condition pump 2 is obtained in real time, reducing the measurement time; the performance change trend of the constant flow condition pump 2 is judged according to the performance index of the constant flow condition pump 2, and the detection accuracy is high.

[0047] The method for evaluating the performance of a nuclear power plant constant flow condition pump described in this embodiment includes the following steps:

[0048] Get the actual inlet pressure value X and the actual outlet pressure value Y of the constant flow working condition pump 2 in the previous time period j, and calculate the actual inlet and outlet pressure correlation coefficient of the constant flow working condition pump 2 in the previous time period j

[0049] Get the actual inlet pressure value X' and the actual outlet pressure value Y' of the constant flow working condition pump 2 in the next time period j', and calculate the actual inlet and outlet pressure correlation coefficient of the constant flow working condition pump 2 in the next time period j'

[0050] Compare the correlation coefficients of the actual inlet and outlet pressures of the constant flow pump 2 in the previous time period j Correlation coefficient between the actual inlet and outlet pressures and the next time period j' Obtain the performance index η of the constant flow working condition pump 2;

[0051] The performance change trend of the constant flow working condition pump 2 is determined according to the performance index η of the constant flow working condition pump 2.

[0052] In this embodiment, as one of the achievable methods, after the constant flow working condition pump 2 is debugged and accepted, the actual inlet pressure value x of each measuring point i in the previous time period j of the constant flow working condition pump 2 is obtained. i And the actual outlet pressure value y i , forming the actual inlet pressure value X and the actual outlet pressure value Y of the constant flow working condition pump 2 in the previous time period j; i = 1, 2, ..., n; the actual inlet pressure value X of the constant flow working condition pump 2 in the previous time period j = (x1, x2, ..., x n ); the actual outlet pressure value Y of the constant flow pump 2 in the previous time period j = (y1, y2, ..., yn ).

[0053] In this embodiment, as one of the feasible ways, the actual inlet and outlet pressure correlation coefficient of the constant flow working condition pump 2 in the previous time period j is calculated. The steps include:

[0054] Calculate the actual inlet pressure mean value E(X) and the actual outlet pressure mean value E(Y) of the constant flow working condition pump 2 in the previous time period j;

[0055] Calculate the actual inlet pressure variance value D(X) and the actual outlet pressure variance value D(Y) of the constant flow working condition pump 2 in the previous time period j;

[0056] Calculate the actual inlet and outlet pressure covariance value Cov(X,Y) of the constant flow condition pump 2 in the previous time period j;

[0057] Calculate the actual inlet and outlet pressure correlation coefficient of constant flow pump 2 in the previous time period j

[0058] In this embodiment, as one of the achievable methods, the actual inlet pressure average of the constant flow working condition pump 2 in the previous time period j is The average actual outlet pressure of the constant flow pump 2 in the previous time period j The actual inlet pressure variance value D(X) of the constant flow pump 2 in the previous time period j is E{[XE(X)] 2}; The actual outlet pressure variance value of constant flow pump 2 in the previous time period j is D(Y)=E{[YE(Y)] 2}; Covariance value of the actual inlet and outlet pressures of the constant flow condition pump 2 in the previous time period j Cov(X,Y)=E{[XE(X)][YE(Y)]}; Correlation coefficient of the actual inlet and outlet pressures of the constant flow condition pump 2 in the previous time period j

[0059] In this embodiment, as one of the achievable methods, after the constant flow working condition pump 2 is debugged and accepted, the actual inlet pressure value x' of each measuring point i' in the next time period j' of the constant flow working condition pump 2 is obtained. i And the actual outlet pressure value y' i , forming the actual inlet pressure value X' and the actual outlet pressure value Y' of the constant flow working condition pump 2 in the next time period j'; i'=1,2,...n; the actual inlet pressure value X' of the constant flow working condition pump 2 in the next time period j'=(x'1,x'2,...,x' n ); The actual outlet pressure value Y' of the constant flow pump 2 in the next time period j' is (y'1, y'2, ..., y'n ).

[0060] In this embodiment, as one of the achievable methods, the actual inlet and outlet pressure correlation coefficient of the constant flow working condition pump 2 in the next time period j' is calculated. The steps include:

[0061] Calculate the actual inlet pressure mean value E(X') and the actual outlet pressure mean value E(Y') of the constant flow working condition pump 2 in the next time period j';

[0062] Calculate the actual inlet pressure variance value D(X') and the actual outlet pressure variance value D(Y') of the constant flow working condition pump 2 in the next time period j';

[0063] Calculate the actual inlet and outlet pressure covariance value Cov(X',Y') of the constant flow condition pump 2 in the next time period j';

[0064] Calculate the actual inlet and outlet pressure correlation coefficient of constant flow condition pump 2 in the next time period j'

[0065] In this embodiment, as one of the achievable methods, the actual inlet pressure average value of the constant flow working condition pump 2 in the next time period j' is The average actual outlet pressure of the constant flow pump 2 in the next time period j' The actual inlet pressure variance value D(X') of the constant flow pump 2 in the next time period j' is D(X') = E{[X'-E(X')] 2}; The actual outlet pressure variance value D(Y') of the constant flow pump 2 in the next time period j' is D(Y') = E{[Y'-E(Y')] 2}; The actual inlet and outlet pressure covariance value Cov(X',Y')=E{[X'-E(X')][Y'-E(Y')]} of the constant flow working condition pump 2 in the next time period j'; The actual inlet and outlet pressure correlation coefficient of the constant flow working condition pump in the next time period j'

[0066] In this embodiment, as one of the achievable methods, the performance index of the constant flow working condition pump 2 is

[0067] In this embodiment, as one of the achievable methods, judging the performance change trend of the constant flow working condition pump 2 according to the performance index η of the constant flow working condition pump 2 includes the following steps:

[0068] When 5%<the performance index η of the constant flow working condition pump 2≤10%, a first-level alarm is issued to remind the staff to pay attention to the change trend of the performance index η of the constant flow working condition pump 2, and judge the performance change trend of the constant flow working condition pump 2 according to the change trend of the performance index η of the constant flow working condition pump 2;

[0069] When the performance index η of the constant flow operating pump 2 is greater than 10%, a secondary alarm is issued to remind the staff to check the bearing temperature parameters and vibration parameters of the constant flow operating pump 2, and judge the operation problems of the constant flow operating pump 2 based on the bearing temperature parameters and vibration parameters of the constant flow operating pump 2.

[0070] The performance index η of the normal operation of the constant flow operating pump 2 is (0~10)%. When the performance index η of the constant flow operating pump 2 is greater than 5%, it is necessary to pay attention to the performance change trend of the constant flow operating pump 2; when the performance index η of the constant flow operating pump 2 is greater than 10%, the probability of problems with the constant flow operating pump 2 is high, and it is necessary to check the bearing temperature parameters and vibration parameters of the constant flow operating pump 2 through a handheld device to determine whether there is a problem with the constant flow operating pump 2.

[0071] In this embodiment, as one of the achievable ways, the previous time period j and the next time period j' of the constant flow working condition pump 2 are of the same length and the measurement point intervals are the same.

[0072] In this embodiment, as one of the achievable ways, the duration of the previous time period j and the next time period j' of the constant flow working condition pump 2 are both one hour, and the interval time between the measuring points is 1 minute.

[0073] refer to Figure 3 As an implementation of the above method, the present invention provides an embodiment of a nuclear power plant constant flow condition pump performance evaluation device. The device embodiment corresponds to the above-mentioned nuclear power plant constant flow condition pump performance evaluation method embodiment, and the device can be specifically applied to various electronic devices.

[0074] The nuclear power plant constant flow condition pump performance evaluation device described in this embodiment includes:

[0075] An acquisition module, used to acquire an actual inlet pressure value X and an actual outlet pressure value Y of the constant flow working condition pump 2 in the previous time period j and an actual inlet pressure value X' and an actual outlet pressure value Y' in the next time period j';

[0076] Calculation module, used to calculate the actual inlet and outlet pressure correlation coefficient of constant flow condition pump 2 in the previous time period j And the actual inlet and outlet pressure correlation coefficient in the next time period j'

[0077] Comparison module, used to compare the actual inlet and outlet pressure correlation coefficients of constant flow condition pump 2 in the previous time period j Correlation coefficient between the actual inlet and outlet pressures and the next time period j' Obtain the performance index η of the constant flow working condition pump 2;

[0078] The evaluation module is used to determine the performance change trend of the constant flow working condition pump 2 according to the performance indicator η of the constant flow working condition pump 2.

[0079] The nuclear power plant constant flow operating pump performance evaluation device proposed in this embodiment does not require the addition of other equipment and does not affect the normal operating state of the constant flow operating pump 2. It uses the existing inlet and outlet pressure gauges of the constant flow operating pump 2 to continuously obtain the inlet and outlet pressure values ​​of the constant flow operating pump 2, which is low in cost. By comparing the inlet and outlet pressure correlation coefficients of the constant flow operating pump 2 in the previous time period and the next time period, the performance index of the constant flow operating pump 2 is obtained in real time, reducing the measurement time. The performance change trend of the constant flow operating pump 2 is judged according to the performance index of the constant flow operating pump 2, and the detection accuracy is high.

[0080] refer to Figure 4 As an implementation of the above method, the present invention provides an embodiment of a computer device, and the computer device embodiment corresponds to the embodiment of the above-mentioned nuclear power plant constant flow condition pump performance evaluation method.

[0081] The computer device described in this embodiment includes a memory, a processor and a network interface that are interconnected and communicated through a system bus. It should be noted that the figure only shows a computer device with a memory, a processor and a network interface, but it should be understood that it is not required to implement all the components shown, and more or fewer components can be implemented instead. Among them, those skilled in the art can understand that the computer device here is a device that can automatically perform numerical calculations and / or information processing according to pre-set or stored instructions, and its hardware includes but is not limited to a microprocessor, an application-specific integrated circuit, a programmable gate array, a digital processor, an embedded device, etc.

[0082] The computer device may be a computing device such as a desktop computer, a notebook, a PDA, a cloud server, etc. The computer device may interact with a user through a keyboard, a mouse, a remote controller, a touch pad, or a voice control device.

[0083] The memory includes at least one type of readable storage medium, and the readable storage medium includes flash memory, hard disk, multimedia card, card-type memory, random access memory, static random access memory, read-only memory, electrically erasable programmable read-only memory, programmable read-only memory, magnetic memory, disk, optical disk, etc. In some embodiments, the memory can be an internal storage unit of the computer device, such as a hard disk or memory of the computer device. In other embodiments, the memory can also be an external storage device of the computer device, such as a plug-in hard disk, smart memory card, secure digital card, flash memory card, etc. equipped on the computer device. Of course, the memory can also include both the internal storage unit of the computer device and its external storage device. In this embodiment, the memory is generally used to store the operating system and various application software installed on the computer device, such as the computer-readable instructions of the above-mentioned nuclear power plant constant flow condition pump performance evaluation method. In addition, the memory can also be used to temporarily store various types of data that have been output or are to be output.

[0084] In some embodiments, the processor may be a central processing unit, a controller, a microcontroller, a microprocessor, or other data processing chip. The processor is generally used to control the overall operation of the computer device. In this embodiment, the processor is used to run the computer-readable instructions stored in the memory or process data, such as running the computer-readable instructions of the above-mentioned nuclear power plant constant flow condition pump performance evaluation method.

[0085] The network interface may include a wireless network interface or a wired network interface, which is generally used to establish a communication connection between the computer device and other electronic devices.

[0086] The computer device proposed in this embodiment does not need to add other equipment, does not affect the normal operating state of the constant flow condition pump 2, and uses the existing inlet and outlet pressure gauges of the constant flow condition pump 2 to continuously obtain the inlet and outlet pressure values ​​of the constant flow condition pump 2, which is low in cost; by comparing the inlet and outlet pressure correlation coefficients of the constant flow condition pump 2 in the previous time period and the next time period, the performance index of the constant flow condition pump 2 is obtained in real time, reducing the measurement time; the performance change trend of the constant flow condition pump 2 is judged according to the performance index of the constant flow condition pump 2, and the detection accuracy is high.

[0087] As an implementation of the above method, the present invention provides an embodiment of a computer-readable storage medium, and the embodiment of the computer-readable storage medium corresponds to the embodiment of the above method for evaluating the performance of a nuclear power plant constant flow condition pump.

[0088] The computer-readable storage medium described in this embodiment stores computer-readable instructions, and the computer-readable instructions can be executed by at least one processor to enable the at least one processor to perform the steps of the above-mentioned nuclear power plant constant flow operating condition pump performance evaluation method.

[0089] The computer-readable storage medium proposed in this embodiment does not require the addition of other equipment and does not affect the normal operating state of the constant flow condition pump 2. The existing inlet and outlet pressure gauges of the constant flow condition pump 2 are used to continuously obtain the inlet and outlet pressure values ​​of the constant flow condition pump 2, which is low in cost. By comparing the inlet and outlet pressure correlation coefficients of the constant flow condition pump 2 in the previous time period and the next time period, the performance index of the constant flow condition pump 2 is obtained in real time, reducing the measurement time. The performance change trend of the constant flow condition pump 2 is judged according to the performance index of the constant flow condition pump 2, and the detection accuracy is high.

[0090] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for evaluating the performance of a nuclear power plant constant flow condition pump, characterized in that: The following steps are involved: Get the actual inlet pressure value X and the actual outlet pressure value Y of the constant flow working condition pump in the previous time period j, and calculate the actual inlet and outlet pressure correlation coefficient of the constant flow working condition pump in the previous time period j Get the actual inlet pressure value X' and the actual outlet pressure value Y' of the constant flow working condition pump in the next time period j', and calculate the actual inlet and outlet pressure correlation coefficient of the constant flow working condition pump in the next time period j' Compare the correlation coefficients of the actual inlet and outlet pressures of the constant flow pump in the previous time period j Correlation coefficient between the actual inlet and outlet pressures and the next time period j' Obtain the performance index η of the constant flow working condition pump; The performance change trend of the constant flow working condition pump is determined according to the performance index η of the constant flow working condition pump.

2. The method for evaluating the performance of a nuclear power plant constant flow operating condition pump according to claim 1, characterized in that: Get the actual inlet pressure value x of each measuring point i in the previous time period j of the constant flow working condition pump i And the actual outlet pressure value y i , forming the actual inlet pressure value X and the actual outlet pressure value Y of the constant flow working condition pump in the previous time period j; i = 1, 2, ..., n; the actual inlet pressure value X of the constant flow working condition pump in the previous time period j = (x1, x2, ..., x n ); the actual outlet pressure value Y of the constant flow pump in the previous time period j = (y1, y2, ..., y n ).

3. The method for evaluating the performance of a nuclear power plant constant flow operating condition pump according to claim 2, characterized in that: Calculate the correlation coefficient of the actual inlet and outlet pressures of the constant flow pump in the previous time period j The steps include: Calculate the actual inlet pressure average value E(X) and the actual outlet pressure average value E(Y) of the constant flow working condition pump in the previous time period j; Calculate the actual inlet pressure variance value D(X) and the actual outlet pressure variance value D(Y) of the constant flow condition pump in the previous time period j; Calculate the actual inlet and outlet pressure covariance value Cov(X,Y) of the constant flow condition pump in the previous time period j; Calculate the correlation coefficient of the actual inlet and outlet pressures of the constant flow pump in the previous time period j 4. The method for evaluating the performance of a nuclear power plant constant flow working condition pump according to claim 3, characterized in that: The average actual inlet pressure of the constant flow pump in the previous time period j The average actual outlet pressure of the constant flow pump in the previous time period j The actual inlet pressure variance value of the constant flow pump in the previous time period j is D(X)=E{[XE(X)] 2 }; The actual outlet pressure variance value of the constant flow pump in the previous time period j D(Y)=E{[YE(Y)] 2 }; Covariance value of the actual inlet and outlet pressures of the constant flow working condition pump in the previous time period j Cov(X,Y)=E{[XE(X)][YE(Y)]}; Correlation coefficient of the actual inlet and outlet pressures of the constant flow working condition pump in the previous time period j 5. The method for evaluating the performance of a nuclear power plant constant flow working condition pump according to claim 1, characterized in that: Get the actual inlet pressure value x' of each measuring point i' in the next time period j' of the constant flow working condition pump i And the actual outlet pressure value y' i , forming the actual inlet pressure value X' and the actual outlet pressure value Y' of the constant flow working condition pump in the next time period j'; i'=1,2,...n; the actual inlet pressure value X' of the constant flow working condition pump in the next time period j'=(x'1,x'2,...,x' n ); the actual outlet pressure value Y'=(y'1,y'2,...,y' n ).

6. The method for evaluating the performance of a nuclear power plant constant flow working condition pump according to claim 5, characterized in that: Calculate the actual inlet and outlet pressure correlation coefficient of the constant flow condition pump in the next time period j' The steps include: Calculate the actual inlet pressure mean value E(X') and the actual outlet pressure mean value E(Y') in the next time period j' of the constant flow condition pump; Calculate the actual inlet pressure variance value D(X') and the actual outlet pressure variance value D(Y') of the constant flow condition pump in the next time period j'; Calculate the actual inlet and outlet pressure covariance value Cov(X',Y') of the constant flow condition pump in the next time period j'; Calculate the actual inlet and outlet pressure correlation coefficient of the constant flow condition pump in the next time period j' 7. The method for evaluating the performance of a nuclear power plant constant flow working condition pump according to claim 6, characterized in that: The actual average inlet pressure of the constant flow pump in the next time period j' The actual average outlet pressure of the constant flow pump in the next time period j' The actual inlet pressure variance value of the constant flow pump in the next time period j' is D(X')=E{[X'-E(X')] 2 }; The actual outlet pressure variance value of the constant flow pump in the next time period j' is D(Y')=E{[Y'-E(Y')] 2 }; The actual inlet and outlet pressure covariance value Cov(X',Y')=E{[X'-E(X')][Y'-E(Y')]} of the constant flow working condition pump in the next time period j'; The actual inlet and outlet pressure correlation coefficient of the constant flow working condition pump in the next time period j' 8. The method for evaluating the performance of a nuclear power plant constant flow working condition pump according to claim 1, characterized in that: Performance indicators of constant flow pumps 9. The method for evaluating the performance of a nuclear power plant constant flow working condition pump according to claim 1, characterized in that: Judging the performance change trend of the constant flow working condition pump according to the performance index η of the constant flow working condition pump includes the following steps: When 5%<the performance index η of the constant flow working condition pump≤10%, a first-level alarm is issued to remind the staff to pay attention to the changing trend of the performance index η of the constant flow working condition pump and judge the performance changing trend of the constant flow working condition pump according to the changing trend of the performance index η of the constant flow working condition pump; When the performance index η of the constant flow working pump is greater than 10%, a secondary alarm is issued to remind the staff to check the bearing temperature parameters and vibration parameters of the constant flow working pump, and judge the operation problems of the constant flow working pump based on the bearing temperature parameters and vibration parameters of the constant flow working pump.

10. A nuclear power plant constant flow pump performance evaluation device, characterized in that: include: An acquisition module is used to acquire an actual inlet pressure value X and an actual outlet pressure value Y of a constant flow working condition pump in a previous time period j and an actual inlet pressure value X' and an actual outlet pressure value Y' in a next time period j'; The calculation module is used to calculate the actual inlet and outlet pressure correlation coefficient of the constant flow condition pump in the previous time period j And the actual inlet and outlet pressure correlation coefficient in the next time period j' Comparison module, used to compare the actual inlet and outlet pressure correlation coefficients of the constant flow condition pump in the previous time period j Correlation coefficient between the actual inlet and outlet pressures and the next time period j' Obtain the performance index η of the pump under constant flow condition; The evaluation module is used to determine the performance change trend of the constant flow working condition pump according to the performance index η of the constant flow working condition pump.

11. A computer device comprising a memory and a processor, wherein the memory stores computer-readable instructions, characterized in that: When the processor executes the computer-readable instructions, the steps of the nuclear power plant constant flow pump performance evaluation method as described in any one of claims 1-9 are implemented.

12. A computer-readable storage medium having computer-readable instructions stored thereon, characterized in that: When the computer-readable instructions are executed, the steps of the method for evaluating the performance of a constant flow pump in a nuclear power plant as described in any one of claims 1 to 9 are implemented.

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