Method for evaluating leakage state of primary pump no.1 shaft seal of nuclear power plant and device thereof

Abstract

The application provides an evaluation method for a leakage state of a primary pump No. 1 shaft seal of a nuclear power plant, comprising: collecting state measurement data according to equipment characteristic parameters of the No. 1 shaft seal; and processing the state measurement data by using a state evaluation model to obtain a leakage state grade of the No. 1 shaft seal. The scheme mainly uses the state evaluation model to process the state measurement data to obtain the leakage state grade of the No. 1 shaft seal. After the grade is divided, the leakage condition of the No. 1 shaft seal can be more accurately evaluated, so that subsequent intervention according to the leakage condition is also more timely and effective.

Description

Technical Field

[0001] The present invention belongs to the technical field of nuclear power main pumps, and in particular relates to a method, device, computer equipment, computer storage medium and computer program product for evaluating the leakage status of a No. 1 shaft seal of a nuclear power plant main pump. Background Art

[0002] The No. 1 shaft seal of the main pump is a non-contact convergent fluid static pressure mechanical shaft seal. The end face friction coefficient is low, the heat generation and friction are small, and it can operate reliably for a long time under high-speed and high-pressure conditions. Under high-speed and high-pressure operation, the downward closing force of the sealing surface comes from the fluid pressure and the deadweight of the static ring. The opening force of the sealing surface comes from the pressure of the liquid film. The static ring seal assembly floats up and down on the outside of the insert ring to adjust the stiffness of the liquid film, thereby establishing a dynamic balance between the closing force and the opening force inside the seal. The leakage flow of the main pump shaft seal reflects the state of the shaft seal liquid film. If the leakage flow is too low, the liquid film stiffness is insufficient and the shaft seal sealing surface may collide; if the leakage flow is too high, the shaft seal performance may be degraded, and in severe cases, a pump stop signal will be triggered.

[0003] The traditional leakage monitoring method for the main pump's No. 1 shaft seal is to simply compare the leakage volume with the limit value, and over-rely on the experience of technicians to set the limit value, resulting in inaccurate assessment of the leakage situation. Summary of the Invention

[0004] The present application provides a method and device for evaluating the leakage status of the No. 1 shaft seal of the main pump of a nuclear power plant, which can accurately evaluate the leakage status of the No. 1 shaft seal.

[0005] The present application provides a method for evaluating the leakage status of the No. 1 shaft seal of the main pump of a nuclear power plant, comprising: collecting status measurement data based on the equipment characteristic parameters of the No. 1 shaft seal; processing the status measurement data using a status evaluation model to obtain the leakage status level of the No. 1 shaft seal.

[0006] In one embodiment, the state measurement data includes the No. 1 shaft seal pressure difference and the No. 1 shaft seal flow rate, and the state evaluation model includes at least one flow rate limit range; and / or the state measurement data includes the No. 1 shaft seal inlet temperature, and the state evaluation model includes at least one temperature limit range; and processing the state measurement data using the state evaluation model to obtain the leakage state level of the No. 1 shaft seal includes:

[0007] Obtaining the leakage status level according to the relationship between the No. 1 shaft seal flow rate and the at least one flow limit range; and / or

[0008] The leakage state level is obtained according to a relationship between the No. 1 shaft seal inlet temperature and the at least one temperature limit range.

[0009] In one embodiment, the leakage status level is a prohibited operation state, an abnormal operation state, a normal operation state, or a restricted operation state.

[0010] In one embodiment, the at least one temperature limit range includes at least one of a first temperature limit range, a second temperature limit range, or a third temperature limit range, the first temperature limit range is a range in which the No. 1 shaft seal inlet temperature is greater than or equal to a first temperature preset value, the second temperature limit range is a range in which the No. 1 shaft seal inlet temperature is less than the first temperature preset value and greater than or equal to a second temperature preset value, the third temperature limit range is a range in which the No. 1 shaft seal inlet temperature is less than the second temperature preset value, and the first temperature preset value is greater than the second temperature preset value;

[0011] The state evaluation model is used to process the state measurement data to obtain the leakage state level of the No. 1 shaft seal, including:

[0012] When the No. 1 shaft seal inlet temperature falls within the first temperature limit range, the leakage status level is the prohibited operation state; or

[0013] When the No. 1 shaft seal inlet temperature falls within the second temperature limit range, the leakage state level is the abnormal operation state; or

[0014] When the No. 1 shaft seal inlet temperature falls within the third temperature limit range, the leakage state level is the normal operating state or the restricted operating state.

[0015] In one embodiment, the at least one flow limit range includes at least one of a prohibited operation range, an abnormal operation range, a normal operation range, or a restricted operation range; and the processing of the state measurement data using a state evaluation model to obtain a leakage state level of the No. 1 shaft seal includes:

[0016] When the No. 1 shaft seal flow rate falls within the prohibited operation range, the leakage state level is the prohibited operation state; or

[0017] When the No. 1 shaft seal flow rate falls within the abnormal operation range, the leakage state level is the abnormal operation state; or

[0018] When the No. 1 shaft seal flow rate is within the normal operating range, the leakage state level is the normal operating state; or

[0019] When the No. 1 shaft seal flow rate falls within the restricted operating range, the leakage state level is the restricted operating state.

[0020] In one embodiment, the flow limit range is determined based on a function curve formed by the No. 1 shaft seal flow and the No. 1 shaft seal pressure difference, and the function curve includes a first curve, a second curve, a third curve and a fourth curve; the range in which the No. 1 shaft seal flow is greater than or equal to the first curve is a prohibited operation range, the range in which the No. 1 shaft seal flow is less than the first curve and greater than or equal to the second curve is an abnormal operation range, the range in which the No. 1 shaft seal flow is less than the second curve and greater than the third curve is a normal operation range, the range in which the No. 1 shaft seal flow is less than or equal to the third curve and greater than the fourth curve is a restricted operation range, and the range in which the No. 1 shaft seal flow is less than or equal to the fourth curve is a prohibited operation range.

[0021] In one embodiment, collecting state measurement data according to the device characteristic parameters includes: selecting a data collection unit according to the device characteristic parameters and the system pressure state; and collecting the state measurement data using the data collection unit.

[0022] In one embodiment, the data acquisition unit includes a pressure differential acquisition unit and a flow acquisition unit; and / or the data acquisition unit includes a temperature acquisition unit, and the temperature acquisition unit is an inlet thermometer of the No. 1 shaft seal. The data acquisition unit is selected according to the characteristic parameters of the equipment, including:

[0023] When the loop pressure of the No. 1 shaft seal is greater than the preset pressure value, the pressure sensor at the outlet of the pressure vessel and the pressure sensor of the control box are selected as the pressure acquisition unit; or

[0024] When the circuit pressure is less than or equal to the preset pressure value, selecting a No. 1 shaft seal pressure differential meter as the pressure acquisition unit; or

[0025] When the leakage flow rate of the No. 1 shaft seal is less than or equal to the preset flow rate value, selecting a first range flow meter as the flow acquisition unit; or

[0026] When the leakage flow rate is greater than the preset flow rate value, a second range flow meter is selected as the flow acquisition unit, wherein the range of the first range flow meter is smaller than the range of the second range flow meter.

[0027] In one embodiment, the equipment characteristic parameter is obtained based on the failure mode of the No. 1 shaft seal of the main pump.

[0028] In a second aspect, a device for evaluating the leakage status of the No. 1 shaft seal of the main pump of a nuclear power plant is provided, the device comprising a unit for executing the method of any one of the implementation modes of the above-mentioned first aspect.

[0029] In a third aspect, a device for evaluating the leakage status of the No. 1 shaft seal of a nuclear power plant main pump is provided. The device comprises: a memory for storing a program; and a processor for executing the program stored in the memory. When the program stored in the memory is executed, the processor is configured to perform the method of any one of the implementations of the first aspect. The device can be a host computer, a computer, a server, a cloud device, or other device capable of running programs. The device can also be a chip.

[0030] According to a fourth aspect, a computer-readable medium is provided, which stores a program code for execution by a device, wherein the program code includes a method for executing the first aspect and any one of its implementations.

[0031] In a fifth aspect, a computer program product comprising instructions is provided, which, when run on a computer, enables the computer to execute the method in the first aspect and any one of its implementations.

[0032] In a sixth aspect, a chip is provided, comprising a processor and a data interface, wherein the processor reads instructions stored in a memory through the data interface and executes the method in the above-mentioned first aspect and any one of its implementation methods.

[0033] Optionally, as an implementation method, the chip may further include a memory, in which instructions are stored, and the processor is used to execute the instructions stored on the memory. When the instructions are executed, the processor is used to execute the method in the first aspect and any one of its implementation methods.

[0034] In this application's technical solution, a state assessment model is primarily used to process state measurement data to determine the leakage status level of the No. 1 shaft seal. This grading allows for a more accurate assessment of the No. 1 shaft seal's leakage, making subsequent intervention based on the leakage more timely and effective. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic flow chart of a method for evaluating the leakage status of the No. 1 shaft seal of the main pump of a nuclear power plant according to an embodiment of the present application.

[0036] Figure 2 4 is a schematic flowchart of the execution process of determining the leakage status level in an embodiment of the present application.

[0037] Figure 3 This is a schematic diagram of the relationship between the No. 1 shaft seal pressure difference and the flow limit range in an embodiment of the present application.

[0038] Figure 4 This is a flow chart for selecting a data acquisition unit according to an embodiment of the present application.

[0039] Figure 5 It is a structural schematic diagram of a device for evaluating the leakage status of the No. 1 shaft seal of a nuclear power plant main pump according to an embodiment of the present application.

[0040] Figure 6 It is a schematic diagram of the internal structure of a computer device according to an embodiment of the present application. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0042] Figure 1 This is a schematic flow chart of the method for evaluating the leakage status of the No. 1 shaft seal of the main pump of a nuclear power plant according to an embodiment of the present application. Figure 1 The steps shown are introduced.

[0043] 101. Collect status measurement data based on the equipment characteristic parameters of the No. 1 shaft seal.

[0044] 102. Process the state measurement data using a state evaluation model to obtain a leakage state level of the No. 1 shaft seal.

[0045] exist Figure 1 In the illustrated solution, a condition assessment model is primarily used to process the measured data to determine the leakage status level of the No. 1 shaft seal. This grading allows for a more accurate assessment of the No. 1 shaft seal's leakage, enabling more timely and effective intervention based on the leak.

[0046] Optionally, the above-mentioned state measurement data may include at least one of the No. 1 shaft seal pressure difference, the No. 1 shaft seal flow rate or the No. 1 shaft seal inlet temperature.

[0047] Optionally, the above-mentioned state evaluation model may include at least one flow limit range corresponding to the No. 1 shaft seal pressure difference and / or at least one temperature limit range corresponding to the No. 1 shaft seal inlet temperature.

[0048] In some implementations, the state measurement data includes the No. 1 shaft seal pressure difference and the No. 1 shaft seal flow, and the state evaluation model includes at least one flow limit range; and / or, the state measurement data includes the No. 1 shaft seal inlet temperature, and the state evaluation model includes at least one temperature limit range.

[0049] Optionally, the leakage status level can be a prohibited operation state, an abnormal operation state, a normal operation state, or a restricted operation state. The prohibited operation state can be understood as the No. 1 shaft seal leakage rate operating in this state, reflecting that the leakage rate has exceeded the upper and lower limits of the operation requirements. Exceeding the upper limit will affect the safety of the core, and being below the lower limit will cause the risk of shaft seal damage and failure. The abnormal operation state can be understood as the No. 1 shaft seal leakage rate operating in this state, reflecting that the leakage rate is in an abnormal state and requires attention and intervention to avoid further increase in the leakage rate. The normal operation state can be understood as the No. 1 shaft seal leakage rate operating in this state meets the requirements and is monitored and operated normally. The restricted operation state can be understood as the No. 1 shaft seal leakage rate is lower than the required limit, and it is necessary to restrict operation and take intervention measures to avoid further reduction in the leakage rate.

[0050] In some implementations, step 102 may include: obtaining a leakage status level based on a relationship between the No. 1 shaft seal flow rate and at least one flow limit range, and / or obtaining a leakage status level based on a relationship between the No. 1 shaft seal inlet temperature and at least one temperature limit range. Figure 2 4 is a schematic flowchart of the execution process of determining the leakage status level in an embodiment of the present application. Figure 2 This can be considered as an example of step 102 .

[0051] 201. Obtain a leakage status level based on a relationship between a No. 1 shaft seal flow rate and at least one flow limit range.

[0052] The No. 1 shaft seal flow rate here is one of the status measurement data collected in step 101 .

[0053] In an example of step 201, at least one flow function value corresponding to the No. 1 shaft seal pressure difference in different flow limit ranges can be calculated based on the collected No. 1 shaft seal pressure difference, and then the actually measured No. 1 shaft seal flow rate is compared with the at least one calculated flow function value to determine which flow limit range it specifically belongs to, and then determine its leakage status level.

[0054] In another example of step 201, assuming the collected differential pressure of the No. 1 shaft seal is x1 and the collected flow rate of the No. 1 shaft seal is y1, the at least one flow rate limit range is plotted in a coordinate system formed by the differential pressure of the No. 1 shaft seal and the flow rate of the No. 1 shaft seal. The leakage level can then be determined based on which flow rate limit range the coordinate point (x1, y1) falls within.

[0055] In another example of step 201, assuming the collected differential pressure of the No. 1 shaft seal is x1 and the collected flow rate of the No. 1 shaft seal is y1, the at least one flow rate limit range is plotted using a function curve in the coordinate system formed by the differential pressure of the No. 1 shaft seal and the flow rate of the No. 1 shaft seal. The flow rate limit range can be determined by finding the closest distance between the coordinate point (x1, y1) and the function curve. The coordinate point is closest to the curve, which indicates the closest distance between the coordinate point and the function curve.

[0056] In another example of step 201, it is also possible to first calculate which flow limit range or ranges the No. 1 shaft seal flow rate may be in based on the collected flow rate, and then determine which flow limit range the No. 1 shaft seal pressure difference is in based on the collected flow rate. Figure 3 As shown in the figure, when the collected No. 1 shaft seal flow is greater than 1200L / h, it can be determined that it is within the prohibited operation range and no further judgment is required. Figure 3 As shown in the figure, when the collected No. 1 shaft seal flow is less than 55L / h, it can also be determined to be in the prohibited operation range. Figure 3 As shown, when the collected No. 1 shaft seal flow is equal to 1000L / h, it may be a prohibited operating range, an abnormal operating range or a normal operating range, but it cannot be a restricted operating range.

[0057] As can be seen from the above examples, when obtaining the leakage status level based on the relationship between the No. 1 shaft seal flow rate and at least one flow limit range, the leakage status level may be determined based only on the No. 1 shaft seal flow rate and the flow limit range, or the leakage status level may be determined in combination with the No. 1 shaft seal pressure differential, the No. 1 shaft seal flow rate and the flow limit range.

[0058] In one embodiment, the at least one flow limit range includes at least one of a prohibited operation range, an abnormal operation range, a normal operation range, or a restricted operation range.

[0059] When the status measurement data is processed using the status evaluation model to obtain the leakage status level of the No. 1 shaft seal, the following may be included:

[0060] When the No. 1 shaft seal flow rate falls within the prohibited operation range, the leakage state level is the prohibited operation state; or

[0061] When the No. 1 shaft seal flow rate falls within the abnormal operation range, the leakage state level is the abnormal operation state; or

[0062] When the No. 1 shaft seal flow rate is within the normal operating range, the leakage state level is the normal operating state; or

[0063] When the first shaft seal flow belongs to the limited operation range, the leakage state level is the limited operation state. In some implementations, the at least one flow limit range is determined according to a function curve of the first shaft seal flow and the first shaft seal pressure difference, and the function curve includes a first curve, a second curve, a third curve, and a fourth curve; a range in which the first shaft seal flow is greater than or equal to the first curve is the prohibited operation range, a range in which the first shaft seal flow is less than the first curve and greater than or equal to the second curve is the abnormal operation range, a range in which the first shaft seal flow is less than the second curve and greater than the third curve is the normal operation range, a range in which the first shaft seal flow is less than or equal to the third curve and greater than the fourth curve is the limited operation range, and a range in which the first shaft seal flow is less than or equal to the fourth curve is the prohibited operation range.

[0064] Optionally, the function curve can be represented by the following formulas respectively, where x represents the first shaft seal pressure difference, and y represents a function value of the first shaft seal leakage calculated according to x:

[0065] The first curve: y = a1*x + b1, M ≤ x ≤ N; y = c1, N < x ≤ P.

[0066] The second curve: y = a2*x + b2, M ≤ x ≤ P.

[0067] The third curve: y = a3*x + b3, M ≤ x ≤ P.

[0068] The fourth curve: y = a4*x + b4, M ≤ x ≤ Q; y = c4*x + d4, Q < x ≤ P.

[0069] In the above formulas, a1, a2, a3, a4, and c4 are coefficient parameters, b1, b2, b3, b4, c1, and d4 are constant parameters, and the coefficient parameters and the constant parameters are real numbers. M, N, P, and Q are constant parameters for representing the value range (value interval) of x. "*" is a multiplication operator.

[0070] In one example, a1 = 7.61, a2 = 6.19, a3 = 1.345, a4 = 0.724, c4 = 0.8, b1 = 263.9, b2 = 148.1, b3 = 41.53, b4 = 47.78, c1 = 1200, d4 = 36, M = 10, N = 123, P = 170, and Q = 155, and the function curve can be represented by the following formulas respectively:

[0071] The first curve: y = 7.61x + 263.9, 10 ≤ x ≤ 123; y = 1200, 123 < x ≤ 170.

[0072] The second curve: y = 6.19x + 148.1, 10 ≤ x ≤ 170.

[0073] Third curve: y = 1.345x + 41.53, 10≤x≤170.

[0074] Fourth curve: y = 0.724x + 47.78, 10≤x≤155; y = 0.8x + 36, 155 < x≤170.

[0075] It can be understood that the values of the coefficients a1, a2, a3, a4 and c4 in the first curve, the second curve, the third curve and the fourth curve can be changed within a predetermined range, for example, within a range of plus or minus 0.2. Similarly, the values of the coefficients b1, b2, b3, b4 and d4 can also be changed within a certain range. The value range of X can also be changed within a certain range, for example, M = 8, N = 120 or P = 180, and the like, which will not be listed one by one.

[0076] Optionally, step 201 can include 201A and 201B.

[0077] 201A, compare the numberical relationship between the first shaft seal flow and the function curve, so as to determine which flow limit range the first shaft seal flow is in.

[0078] 201B, determine the leakage state level corresponding to the flow limit range in which the first shaft seal flow is as the leakage state level of the first shaft seal flow.

[0079] 202, obtain the leakage state level according to the relationship between the first shaft seal inlet temperature and at least one temperature limit range.

[0080] The first shaft seal inlet temperature here is one of the state measurement data collected in step 101.

[0081] In one embodiment, the at least one temperature limit range includes at least one of a first temperature limit range, a second temperature limit range or a third temperature limit range, the first temperature limit range is a range in which the first shaft seal inlet temperature is greater than or equal to a first temperature preset value, the second temperature limit range is a range in which the first shaft seal inlet temperature is less than the first temperature preset value and the first temperature preset value is greater than or equal to a second temperature preset value, the third temperature limit range is a range in which the first shaft seal inlet temperature is less than the second temperature preset value, and the first temperature preset value is greater than the second temperature preset value. When the state evaluation model is used to process the state measurement data to obtain the leakage state level of the first shaft seal, it can include:

[0082] When the first shaft seal inlet temperature belongs to the first temperature limit range, the leakage state level is the prohibited operation state; or

[0083] When the No. 1 shaft seal inlet temperature falls within the second temperature limit range, the leakage state level is the abnormal operation state; or

[0084] When the No. 1 shaft seal inlet temperature falls within the third temperature limit range, the leakage state level is the normal operating state or the restricted operating state.

[0085] For example, the first preset temperature value is 92°C, the second preset temperature value is 77°C, the range of the No. 1 shaft seal inlet temperature greater than or equal to 92°C is the first temperature limit range, the range of the No. 1 shaft seal inlet temperature less than 92°C and greater than or equal to 77°C is the second temperature limit range, and the range of the No. 1 shaft seal inlet temperature less than 77°C is the third temperature limit range. It should be understood that the above temperature values ​​are merely examples and are not intended to be limiting.

[0086] In one example, step 202 includes the following steps 202A-202E. Figure 2 T in the middle represents the No. 1 shaft seal inlet temperature.

[0087] 202A. Determine whether the No. 1 shaft seal inlet temperature is greater than or equal to 92°C. If the judgment result is "yes", execute 202B; if the judgment result is "no", execute 202C.

[0088] 202B, the output leakage status level is the prohibited operation status.

[0089] 202C. Determine whether the No. 1 shaft seal inlet temperature is greater than or equal to 77°C. If the judgment result is "Yes", execute 202D. If the judgment result is "No", execute 202E.

[0090] 202D, the output leakage status level is abnormal operating status.

[0091] 202E, the output leakage status level is normal or limited operation status.

[0092] It should be noted that only one of step 201 and step 202 can be performed, or both can be performed, and the order of execution is not limited.

[0093] For example, if step 202 is executed and the No. 1 shaft seal inlet temperature is found to be above 92°C, then step 201 may or may not be executed. For example, the leakage status level may be directly output as a prohibited operation state, and step 201 may not be executed. For another example, if step 202 is executed and the No. 1 shaft seal inlet temperature is found to be less than 77°C, then the leakage status level may be either a normal operation state or a restricted operation state. In this case, the determination result of step 201 may be further combined to determine whether it is a normal operation state or a restricted operation state. For another example, if step 201 determines the leakage status level, step 202 may not be executed. There are many other situations, which are not listed here for the sake of brevity.

[0094] For a more intuitive understanding Figure 2 The scheme shown below is combined with Table 1 and Figure 3 Make an introduction.

[0095] Table 1 is a relationship table between leakage status levels and limit ranges in an embodiment of the present application.

[0096] Table 1

[0097] Leakage status level Temperature limit range Flow limit range Prohibited operation status T≥92℃ Q≥the first curve, or Q≤the second curve Abnormal operating status 77℃≤T<92℃ Q<first curve, and Q≥second curve Normal operating status T＜77℃ Q<second curve, and Q>third curve Restricted operating status T＜77℃ Q≤the third curve, and Q>the fourth curve

[0098] In Table 1, Q represents the No. 1 shaft seal leakage flow collected in step 101, x represents the No. 1 shaft seal pressure difference, y represents the function value of the No. 1 shaft seal leakage calculated based on x, and T represents the No. 1 shaft seal inlet temperature.

[0099] It should be understood that only at least one of the temperature limit range and the flow limit range is needed to obtain the corresponding leakage status level, but the temperature limit range of T<77℃ is an exception. Since it corresponds to two leakage status levels, the flow limit range needs to be combined to determine whether it is a normal operating state or a restricted operating state.

[0100] In addition, all four leakage status levels can be determined using only the flow limit range. For example, when T ≥ 92°C, or Q ≥ the first curve, or Q ≤ the second curve, the leakage status level is a prohibited operation state. When 77°C ≤ T < 92°C, or Q < the first curve and Q ≥ the second curve, the leakage status level is an abnormal operation state. When T < 77°C, and Q < the second curve, and Q > the third curve, the leakage status level is a normal operation state. When T < 77°C, and Q ≤ the third curve, and Q > the fourth curve, the leakage status level is a restricted operation state. When Q < the second curve, and Q > the third curve, the leakage status level is a normal operation state. When Q ≤ the third curve, and Q > the fourth curve, the leakage status level is a restricted operation state. In Table 1, the first temperature preset value is 92°C and the second temperature preset value is 77°C.

[0101] Figure 3 This is a schematic diagram of the relationship between the No. 1 shaft seal pressure difference and the flow limit range in the embodiment of the present application. Figure 3 As shown, the horizontal axis is the pressure difference of the No. 1 shaft seal, that is, x in the above text, the unit is bar, and the vertical axis is the flow rate of the No. 1 shaft seal, the unit is L / h. Figure 3 The function curves in include a first curve, a second curve, a third curve and a fourth curve.

[0102] In the above formula, y represents the function value of the leakage of the No. 1 shaft seal calculated based on x.

[0103] exist Figure 3 In this example, the coordinates of A are (10, 340), B are (123, 1200), C are (170, 1200), D are (10, 210), E are (10, 55), F are (170, 270), G are (155, 160), and H are (170, 172). The curve formed by ABC is the first curve, the straight line segment formed by DC is the second curve, the straight line segment formed by EF is the third curve, and the curve formed by EGH is the fourth curve. The formulas for the four function curves are described above.

[0104] From the above formula and Figure 3 It can be seen that in the above function curves, the first curve and the fourth curve are both piecewise functions. The two value intervals of x in the first curve correspond to different functional expressions, and the two value intervals of x in the fourth curve correspond to different functional expressions. In the second and third curves, x has only one value space.

[0105] from Figure 3 It can be seen that the range above the first curve is the prohibited operation range, and the corresponding leakage status level is the prohibited operation state; the range below the first curve and above the second curve (i.e., between the first curve and the second curve) is the abnormal operation range, and the corresponding leakage status level is the abnormal operation state; the range below the second curve and above the third curve (i.e., between the second curve and the third curve) is the normal operation range, and the corresponding leakage status level is the normal operation state; the range below the third curve and above the fourth curve (i.e., between the third curve and the fourth curve) is the restricted operation range, and the corresponding leakage status level is the restricted operation state; the range below the fourth curve is the prohibited operation range, and the corresponding leakage status level is the prohibited operation state.

[0106] The above combination Figure 2 、 Figure 3 Table 1 further introduces step 102. Figure 4 The execution of step 101 is further described.

[0107] In some implementations, step 101 can include: selecting a data acquisition unit according to the equipment characteristic parameter; and collecting the state measurement data by using the data acquisition unit.

[0108] Optionally, the equipment characteristic parameter can be obtained by failure phenomenon analysis and characteristic parameter analysis according to a failure mode of the primary pump No. 1 shaft seal.

[0109] Optionally, the data acquisition unit can include at least one of a pressure acquisition unit, a flow acquisition unit, or a temperature acquisition unit. The data acquisition unit can include the pressure acquisition unit and the flow acquisition unit; and / or the data acquisition unit can include the temperature acquisition unit. The temperature acquisition unit can be an inlet temperature gauge of the No. 1 shaft seal. The pressure acquisition unit can include a pressure sensor at an outlet end of a pressure vessel, a pressure sensor of a control box, and a differential pressure gauge of the No. 1 shaft seal. The flow acquisition unit can include a first range flow meter and a second range flow meter, and a range of the first range flow meter is smaller than a range of the second range flow meter. For example, the first range flow meter can be a narrow range flow meter, and the second range flow meter can be a wide range flow meter.

[0110] In some implementations, when the data acquisition unit is selected according to the equipment characteristic parameter, the following operations can be adopted:

[0111] When the loop pressure of the No. 1 shaft seal is greater than a pressure preset value, the pressure sensor at the outlet end of the pressure vessel and the pressure sensor of the control box are selected as the pressure acquisition unit; or

[0112] When the loop pressure is less than or equal to the pressure preset value, the differential pressure gauge of the No. 1 shaft seal is selected as the pressure acquisition unit; or

[0113] When the leakage flow rate of the No. 1 shaft seal is less than or equal to a flow rate preset value, the first range flow meter is selected as the flow acquisition unit; or

[0114] When the leakage flow rate is greater than the flow rate preset value, the second range flow meter is selected as the flow acquisition unit, and a range of the first range flow meter is smaller than a range of the second range flow meter.

[0115] Optionally, the pressure preset value can be 33 bar or other similar values.

[0116] Optionally, the flow rate preset value can be 0.34 m 3 / h or other similar values.

[0117] It should be understood that the above-mentioned pressure preset value and flow rate preset value are only examples of their values, and other values can also exist, and there is no limitation.

[0118] Optionally, the first range flowmeter can be a narrow range flowmeter, and the second range flowmeter can be a wide range flowmeter.

[0119] In one example, when the circuit pressure of the first seal is greater than 33 bar, the pressure sensor at the outlet end of the pressure vessel and the pressure sensor of the control cabinet are selected as the pressure acquisition unit; or

[0120] When the circuit pressure is less than or equal to 33 bar, the differential pressure gauge of the first seal is selected as the pressure acquisition unit; or

[0121] When the leakage flow rate of the first seal is less than or equal to 0.34 m 3 / h, the narrow range flowmeter of the first seal is selected as the flow acquisition unit; or

[0122] When the leakage flow rate is greater than 0.34 m 3 / h, the wide range flowmeter of the first seal is selected as the flow acquisition unit.

[0123] Table 2 is a correspondence table of state measurement data and data acquisition units and equipment characteristic parameters.

[0124] Table 2

[0125]

[0126] As shown in Table 2, the state measurement data includes the differential pressure of the first seal, the flow of the first seal, and the inlet temperature of the first seal. The data acquisition unit corresponding to the differential pressure of the first seal is the pressure sensor at the outlet end of the pressure vessel and the pressure sensor of the control cabinet, and the differential pressure gauge of the first seal. The data acquisition unit corresponding to the flow of the first seal is the narrow range flowmeter of the first seal and the wide range flowmeter of the first seal. The data acquisition unit corresponding to the inlet temperature of the first seal is the inlet temperature gauge of the first seal. When the circuit pressure in the equipment characteristic parameters is greater than 33 bar, the pressure sensor at the outlet end of the pressure vessel and the pressure sensor of the control cabinet are selected as the data acquisition unit, specifically as the pressure acquisition unit. When the circuit pressure in the equipment characteristic parameters is less than or equal to 33 bar, the differential pressure gauge of the first seal is selected as the data acquisition unit, specifically as the pressure acquisition unit. When the leakage flow rate of the first seal is less than or equal to 0.34 m 3 / h (cubic meters per hour), the narrow range flowmeter of the first seal is selected as the data acquisition unit, specifically as the flow acquisition unit. When the leakage flow rate of the first seal is greater than 0.34 m 3 / h, the wide range flowmeter of the first seal is selected as the data acquisition unit, specifically as the flow acquisition unit. When the ambient temperature of the first seal is between 0°C and 100°C, the inlet temperature gauge of the first seal is selected as the data acquisition unit, specifically as the temperature acquisition unit.

[0127] The No. 1 shaft seal narrow range flowmeter in Table 2 is an example of a first range flowmeter, the No. 1 shaft seal wide range flowmeter is an example of a second range flowmeter, 33 bar is an example of a pressure preset value, and 0.34 m 3 / h is an example of a flow rate preset value.

[0128] Figure 4 This is a flow chart of selecting a data acquisition unit according to an embodiment of the present application. Figure 4 As shown, the data acquisition unit corresponds to the No. 1 shaft seal pressure difference, No. 1 shaft seal flow rate and No. 1 shaft seal inlet temperature.

[0129] Determine whether the No. 1 shaft seal pressure difference is greater than or equal to 33 bar. When the judgment result is "yes", select the difference between the pressure at the outlet of the pressure vessel and the pressure of the control box as the actually measured No. 1 shaft seal pressure difference data (i.e., one of the status measurement data); when the judgment result is "no", select the measured value of the No. 1 shaft seal pressure difference gauge as the actually measured No. 1 shaft seal pressure difference data.

[0130] Determine whether the flow rate of shaft 1 is less than or equal to 0.34m 3 / h, when the judgment result is "yes", the measurement value of the No. 1 shaft seal narrow-range flowmeter is selected as the actual measured No. 1 shaft seal flow data (that is, one of the status measurement data); when the judgment result is "no", the measurement value of the No. 1 shaft seal wide-range flowmeter is selected as the actual measured No. 1 shaft seal flow data.

[0131] For the No. 1 shaft seal inlet temperature, the measured value of the No. 1 shaft seal inlet thermometer is directly used as the actual measured No. 1 shaft seal temperature data (i.e., one of the state measurement data).

[0132] The above description, combined with the accompanying drawings, describes the process of the method for evaluating the leakage status of the No. 1 shaft seal of a nuclear power plant main pump according to an embodiment of the present application. The following description, combined with the accompanying drawings, describes the device for evaluating the leakage status of the No. 1 shaft seal of a nuclear power plant main pump according to an embodiment of the present application. It should be understood that the device for evaluating the leakage status of the No. 1 shaft seal of a nuclear power plant main pump described below is capable of performing each process of the method for evaluating the leakage status of the No. 1 shaft seal of a nuclear power plant main pump according to an embodiment of the present application. Therefore, repeated descriptions will be appropriately omitted in the following description of the device for evaluating the leakage status of the No. 1 shaft seal of a nuclear power plant main pump.

[0133] Figure 5 This is a schematic diagram of the structure of the evaluation device for the leakage status of the No. 1 shaft seal of the main pump of a nuclear power plant according to an embodiment of the present application. Figure 5 As shown, the evaluation device 2000 includes a collection unit 2001 and a processing unit 200. The evaluation device 2000 can be used to execute the steps in the above method of the embodiment of the present application.

[0134] Acquisition unit 2001 is configured to collect state measurement data based on equipment characteristic parameters. Processing unit 2002 is configured to process the state measurement data using a state assessment model to determine the leakage level of the No. 1 shaft seal. In other words, acquisition unit 2001 can be configured to execute step 101, and processing unit 2002 can be configured to execute step 102.

[0135] Optionally, the above-mentioned state measurement data includes the No. 1 shaft seal pressure difference, the No. 1 shaft seal flow rate and the No. 1 shaft seal inlet temperature.

[0136] Optionally, the state evaluation model includes a flow limit range corresponding to the No. 1 shaft seal pressure difference and a temperature limit range corresponding to the No. 1 shaft seal inlet temperature.

[0137] In some implementations, processing unit 2002 is specifically configured to determine a leakage status level based on a relationship between the No. 1 shaft seal flow rate and a flow rate limit range; and / or to determine a leakage status level based on a relationship between the No. 1 shaft seal inlet temperature and a temperature limit range. In other words, processing unit 2002 may be specifically configured to execute step 201 and / or step 202.

[0138] Optionally, the leakage status level may be a prohibited operation state, an abnormal operation state, a normal operation state, or a restricted operation state.

[0139] For the relationship between the temperature limit range and the leakage status level, the relationship between the flow limit range and the leakage status level, etc., please refer to the relevant description above.

[0140] In an example, the processing unit 2002 may also be specifically configured to execute step 201A and step 201B.

[0141] In another example, the processing unit 2002 may also be specifically configured to execute steps 202A to 202E.

[0142] In some implementations, the processing unit 2002 is specifically configured to select a data acquisition unit according to the device characteristic parameters; and the acquisition unit 2001 is specifically configured to utilize the data acquisition unit to acquire the state measurement data.

[0143] Optionally, the data acquisition unit may include a pressure acquisition unit, a flow acquisition unit, and a temperature acquisition unit. The temperature acquisition unit is an inlet thermometer for the No. 1 shaft seal. The pressure acquisition unit may include a pressure sensor at the outlet of the pressure vessel, a pressure sensor for the control box, and a No. 1 shaft seal differential pressure gauge. The flow acquisition unit may include a first-range flowmeter and a second-range flowmeter, wherein the range of the first-range flowmeter is smaller than the range of the second-range flowmeter. For example, the first-range flowmeter may be a narrow-range flowmeter, and the second-range flowmeter may be a wide-range flowmeter.

[0144] In one example, the acquisition unit 2001 may be specifically configured to execute Figure 4 The steps shown.

[0145] In another example, the acquisition unit 2001 may be specifically configured to perform the following operations:

[0146] When the circuit pressure of the No. 1 shaft seal is greater than the preset pressure value, the pressure sensor at the outlet of the pressure vessel and the pressure sensor of the control box are selected as the pressure acquisition unit; or

[0147] When the circuit pressure is less than or equal to the preset pressure value, selecting a No. 1 shaft seal pressure differential meter as the pressure acquisition unit; or

[0148] When the leakage flow rate of the No. 1 shaft seal is less than or equal to the preset flow rate value, selecting a first range flow meter as the flow acquisition unit; or

[0149] When the leakage flow rate is greater than the preset flow rate value, a second range flow meter is selected as the flow acquisition unit, wherein the range of the first range flow meter is smaller than the range of the second range flow meter.

[0150] Optionally, the preset pressure value may be 33 bar.

[0151] Optionally, the flow rate preset value can be 0.34m 3 / h.

[0152] It should be understood that the processing unit 2002 in the above-mentioned device 2000 can be equivalent to the processor 3002 in the device 3000 below.

[0153] In one embodiment, a device for evaluating the leakage status of the No. 1 shaft seal of the main pump of a nuclear power plant is provided. The device includes: a memory for storing a program; a processor for executing the program stored in the memory. When the program stored in the memory is executed, the processor is used to execute the evaluation method in any of the above implementations. The device can be a computer device such as a host, a computer, a server, a cloud device, etc. that can run a program. The device can also be a chip. Its internal structure diagram can be as follows: Figure 6 shown.

[0154] Figure 6This is a schematic diagram of the internal structure of a computer device in an embodiment of the present application. The computer device may be a server. The computer device includes a processor, a memory, an input / output interface (I / O) and a communication interface. The processor, the memory and the input / output interface are connected via a system bus, and the communication interface is connected to the system bus via the input / output interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The database of the computer device is used to store data such as device characteristic parameters and state measurement data, and can also be used to store state evaluation models. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, it implements any one of the methods for evaluating the leakage status of the No. 1 shaft seal of the main pump of a nuclear power plant provided in the present application.

[0155] An embodiment of the present application provides a computer-readable medium storing a program code for execution by a device, wherein the program code includes a method for evaluating the leakage status of a No. 1 shaft seal for executing any one of the implementations provided in the present application.

[0156] An embodiment of the present application provides a computer program product containing instructions. When the computer program product is run on a computer, the computer is enabled to execute the method for evaluating the leakage status of the No. 1 shaft seal according to any one of the implementations provided in the present application.

[0157] An embodiment of the present application provides a chip, which includes a processor and a data interface. The processor reads instructions stored in a memory through the data interface and executes a method for evaluating the leakage status of a No. 1 shaft seal in any one of the implementations provided in the present application.

[0158] Optionally, as an implementation method, the chip may further include a memory, in which instructions are stored, and the processor is used to execute the instructions stored on the memory. When the instructions are executed, the processor is used to execute the method for evaluating the leakage status of the No. 1 shaft seal of any implementation method provided in this application.

[0159] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory or optical memory, etc. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0160] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0161] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art could make various modifications and improvements without departing from the spirit of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A method for evaluating the leakage status of the No. 1 shaft seal of the main pump of a nuclear power plant, characterized in that: include: Collecting state measurement data based on the equipment characteristic parameters of the No. 1 shaft seal; the state measurement data includes the No. 1 shaft seal pressure difference, the No. 1 shaft seal flow rate and the No. 1 shaft seal inlet temperature; Processing the state measurement data using a state evaluation model to obtain a leakage state level of the No. 1 shaft seal includes: obtaining the leakage state level based on a relationship between the No. 1 shaft seal flow rate and at least one flow limit range in the state evaluation model; obtaining the leakage state level based on a relationship between the No. 1 shaft seal inlet temperature and at least one temperature limit range in the state evaluation model; Among them, obtaining the leakage status level according to the relationship between the No. 1 shaft seal flow and at least one flow limit range in the status evaluation model includes: determining, in at least one flow limit range drawn by a function curve in the coordinate system composed of the No. 1 shaft seal pressure difference and the No. 1 shaft seal flow, which function curve is closest to the coordinate point composed of the collected No. 1 shaft seal pressure difference and the No. 1 shaft seal flow, so as to determine the flow limit range and then determine the leakage status level.

2. The method according to claim 1, characterized in that The leakage status level is a prohibited operation state, an abnormal operation state, a normal operation state or a restricted operation state.

3. The method according to claim 2, characterized in that The at least one temperature limit range includes at least one of a first temperature limit range, a second temperature limit range, or a third temperature limit range, the first temperature limit range is a range in which the No. 1 shaft seal inlet temperature is greater than or equal to a first temperature preset value, the second temperature limit range is a range in which the No. 1 shaft seal inlet temperature is less than the first temperature preset value and greater than or equal to a second temperature preset value, the third temperature limit range is a range in which the No. 1 shaft seal inlet temperature is less than the second temperature preset value, and the first temperature preset value is greater than the second temperature preset value; The state evaluation model is used to process the state measurement data to obtain the leakage state level of the No. 1 shaft seal, including: When the No. 1 shaft seal inlet temperature falls within the first temperature limit range, the leakage status level is the prohibited operation state; or When the No. 1 shaft seal inlet temperature falls within the second temperature limit range, the leakage state level is the abnormal operation state; or When the No. 1 shaft seal inlet temperature falls within the third temperature limit range, the leakage state level is the normal operating state or the restricted operating state.

4. The method according to claim 2, characterized in that The at least one flow limit range includes at least one of a prohibited operation range, an abnormal operation range, a normal operation range, or a restricted operation range; The state evaluation model is used to process the state measurement data to obtain the leakage state level of the No. 1 shaft seal, including: When the No. 1 shaft seal flow rate falls within the prohibited operation range, the leakage state level is the prohibited operation state; or When the No. 1 shaft seal flow rate falls within the abnormal operation range, the leakage state level is the abnormal operation state; or When the No. 1 shaft seal flow rate is within the normal operating range, the leakage state level is the normal operating state; or When the No. 1 shaft seal flow rate falls within the restricted operating range, the leakage state level is the restricted operating state.

5. The method according to claim 4, characterized in that The function curve includes a first curve, a second curve, a third curve and a fourth curve; The range in which the No. 1 shaft seal flow rate is greater than or equal to the first curve is a prohibited operating range, the range in which the No. 1 shaft seal flow rate is less than the first curve and greater than or equal to the second curve is an abnormal operating range, the range in which the No. 1 shaft seal flow rate is less than the second curve and greater than the third curve is a normal operating range, the range in which the No. 1 shaft seal flow rate is less than or equal to the third curve and greater than the fourth curve is a restricted operating range, and the range in which the No. 1 shaft seal flow rate is less than or equal to the fourth curve is a prohibited operating range.

6. The method according to any one of claims 1 to 5, characterized in that The collecting of state measurement data according to the device characteristic parameters includes: Selecting a data acquisition unit according to the characteristic parameters of the device; The state measurement data is collected using the data collection unit.

7. The method according to claim 6, characterized in that The data acquisition unit includes a pressure acquisition unit, a flow acquisition unit and a temperature acquisition unit. The temperature acquisition unit is an inlet thermometer of the No. 1 shaft seal. The data acquisition unit is selected according to the characteristic parameters of the equipment, including: When the loop pressure of the No. 1 shaft seal is greater than the preset pressure value, the pressure sensor at the outlet of the pressure vessel and the pressure sensor of the control box are selected as the pressure acquisition unit; or When the circuit pressure is less than or equal to the preset pressure value, selecting a No. 1 shaft seal pressure differential meter as the pressure acquisition unit; or When the leakage flow rate of the No. 1 shaft seal is less than or equal to the preset flow rate value, selecting a first range flow meter as the flow acquisition unit; or When the leakage flow rate is greater than the preset flow rate value, a second range flow meter is selected as the flow acquisition unit, wherein the range of the first range flow meter is smaller than the range of the second range flow meter.

8. The method according to claim 6 or 7, characterized in that The equipment characteristic parameters are obtained based on the failure mode of the No. 1 shaft seal of the main pump.

9. An evaluation device for the leakage status of the No. 1 shaft seal of the main pump of a nuclear power plant, characterized in that: include: an acquisition unit, configured to acquire status measurement data according to the device characteristic parameters of the No. 1 shaft seal; the status measurement data including the No. 1 shaft seal pressure difference, the No. 1 shaft seal flow rate, and the No. 1 shaft seal inlet temperature; A processing unit is used to process the state measurement data using a state evaluation model to obtain the leakage state level of the No. 1 shaft seal, including: obtaining the leakage state level according to the relationship between the No. 1 shaft seal flow and at least one flow limit range in the state evaluation model; obtaining the leakage state level according to the relationship between the No. 1 shaft seal inlet temperature and at least one temperature limit range in the state evaluation model; wherein, obtaining the leakage state level according to the relationship between the No. 1 shaft seal flow and at least one flow limit range in the state evaluation model includes: determining which function curve is closest to the coordinate point formed by the collected No. 1 shaft seal pressure difference and No. 1 shaft seal flow in at least one flow limit range drawn by a function curve in the coordinate system formed by the No. 1 shaft seal pressure difference and the No. 1 shaft seal flow, so as to determine the flow limit range and further determine the leakage state level.

10. A device for evaluating the leakage status of the No. 1 shaft seal of the main pump of a nuclear power plant, characterized in that: The device includes a processor and a data interface, and the processor reads instructions stored in a memory through the data interface to execute the method according to any one of claims 1 to 8.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 8 is implemented.

12. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the method according to any one of claims 1 to 8 is implemented.

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