Methods and products for determining primary coolant flow rate

Abstract

This application provides a method and product for determining the primary coolant flow rate, relating to the field of nuclear power technology. The method includes: operating the primary loop at multiple main pump speeds, and obtaining the main pump bypass flow rate corresponding to each main pump speed condition through main pump bypass measurement. Fitting the main pump speed and main pump bypass flow rate yields a first relationship curve. Then, using the primary loop model corresponding to the primary loop and multiple primary loop calibration coolant flow rates, a second relationship curve between the main pump speed and the primary loop calibration coolant flow rate is obtained. Based on the first and second relationship curves, a third relationship curve between the main pump bypass flow rate and the primary loop calibration coolant flow rate is determined. The third relationship curve is used to determine the corresponding primary loop coolant flow rate based on the main pump bypass flow rate. Thus, by determining the main pump bypass flow rate and finding the third relationship curve, the primary loop coolant flow rate can be obtained, improving the accuracy of primary loop coolant flow rate measurement.

Description

Technical Field

[0001] This invention relates to the field of nuclear power technology, and more specifically to a method and product for determining the primary coolant flow rate. Background Technology

[0002] The primary coolant flow rate in a nuclear power unit is one of the key thermal safety parameters that requires close monitoring during the design and operation of the unit. The primary coolant flow rate must always be matched to the reactor power output. Therefore, real-time and accurate measurement of the primary coolant flow rate is necessary.

[0003] Currently, in nuclear power units, bent-tube flow meters are generally used to measure the primary coolant flow rate. However, since this measurement method requires the bent-tube flow meter to be installed at the bend, it is limited by the pipeline layout and space constraints. This may result in unsuitability in compact reactors, leading to lower accuracy in primary coolant flow rate measurement.

[0004] Therefore, improving the accuracy of primary coolant flow measurement has become an urgent technical problem to be solved. Summary of the Invention

[0005] The purpose of this application is to provide a method and product for determining the primary coolant flow rate, thereby improving the accuracy of primary coolant flow rate measurement.

[0006] In a first aspect, embodiments of this application provide a method for determining the primary coolant flow rate, the method comprising:

[0007] The main pump bypass flow rate corresponding to the main pump speed conditions is obtained by measuring the main pump bypass flow rate under multiple main pump speed conditions while the primary circuit is running at multiple main pump speed conditions.

[0008] The main pump speed and main pump bypass flow rate corresponding to multiple main pump speed conditions are fitted to obtain the first relationship curve between main pump speed and main pump bypass flow rate.

[0009] Using the primary loop model corresponding to the primary loop, and multiple primary loop calibration coolant flow rates, a second relationship curve between the main pump speed and the primary loop calibration coolant flow rate is obtained;

[0010] Based on the first and second relationship curves, a third relationship curve is determined between the main pump bypass flow rate and the primary circuit calibration coolant flow rate. The third relationship curve is used to determine the primary circuit coolant flow rate corresponding to the main pump bypass flow rate.

[0011] In some implementations, a second relationship curve between the main pump speed and the primary loop calibration coolant flow rate is obtained using a primary loop model and multiple primary loop calibration coolant flow rates, including:

[0012] Within a preset range of the primary coolant flow rate, obtain multiple primary coolant flow rates;

[0013] Multiple primary loop calibration coolant flow rates are input into the primary loop model corresponding to the primary loop to obtain the primary loop pressure drop corresponding to the multiple primary loop calibration coolant flow rates.

[0014] Determine the main pump speed corresponding to the rated coolant flow rate of each primary circuit based on the primary circuit pressure drop corresponding to the primary circuit rated coolant flow rate.

[0015] The second relationship curve between the main pump speed and the primary circuit calibration coolant flow rate is determined based on the primary circuit calibration coolant flow rate and the main pump speed corresponding to the primary circuit calibration coolant flow rate.

[0016] In some implementations, the main pump speed corresponding to the rated coolant flow rate of each primary circuit is determined based on the primary circuit pressure drop corresponding to the primary circuit rated coolant flow rate, including:

[0017] Obtain the fourth relationship curve between the main pump speed and the head;

[0018] Determine the head corresponding to the primary loop calibrated coolant flow rate based on the primary loop pressure drop corresponding to the primary loop calibrated coolant flow rate.

[0019] Based on the fourth relationship curve, the main pump speed corresponding to the rated coolant flow rate of each primary loop is determined.

[0020] In some implementations, before obtaining the second relationship curve between the main pump speed and the primary loop calibration coolant flow rate using a primary loop corresponding to a primary loop model and multiple primary loop calibration coolant flow rates, the determination method further includes:

[0021] Based on the structure of the primary loop, a primary loop model corresponding to the primary loop is constructed. The input of the primary loop model is the primary loop calibration coolant flow rate, and the output of the primary loop model is the primary loop pressure drop corresponding to the primary loop calibration coolant flow rate.

[0022] In some implementations, before acquiring multiple primary loop calibration coolant flow rates within a preset range of the primary loop coolant flow rate, the following steps are included:

[0023] Obtain the maximum primary coolant flow rate of the target nuclear power unit under full-power platform conditions;

[0024] Obtain the minimum primary coolant flow rate of the target nuclear power unit under zero-power platform conditions;

[0025] Based on the minimum and maximum primary coolant flow rates, a preset range for the primary coolant flow rate is determined.

[0026] In some embodiments, after determining the third relationship curve between the main pump bypass flow rate and the primary loop calibration coolant flow rate based on the first and second relationship curves, the determination method further includes:

[0027] Obtain real-time main pump bypass flow;

[0028] Based on the third relationship curve, the primary coolant flow rate corresponding to the real-time main pump bypass flow rate is determined.

[0029] In some implementations, the main pump bypass includes a flow meter, a resistance element, and a pipeline. The resistance element is disposed in the pipeline of the main pump bypass, and the flow meter is disposed downstream of the resistance element. The resistance element is used to regulate the pressure drop of the main pump bypass, and the flow meter is used to collect the flow rate of the main pump bypass.

[0030] Secondly, embodiments of this application provide a device for determining the primary coolant flow rate, the device comprising:

[0031] The measurement module is used to obtain the main pump bypass flow rate corresponding to the main pump speed condition through main pump bypass measurement under multiple main pump speed conditions.

[0032] The fitting module is used to fit the main pump speed and main pump bypass flow rate corresponding to multiple main pump speed conditions to obtain the first relationship curve between the main pump speed and the main pump bypass flow rate.

[0033] The first determining module is used to obtain a second relationship curve between the main pump speed and the primary circuit calibration coolant flow rate by using the primary circuit model corresponding to the primary circuit and multiple primary circuit calibration coolant flow rates.

[0034] The second determining module is used to determine a third relationship curve between the main pump bypass flow rate and the primary circuit calibration coolant flow rate based on the first relationship curve and the second relationship curve. The third relationship curve is used to determine the primary circuit coolant flow rate corresponding to the main pump bypass flow rate.

[0035] Thirdly, embodiments of this application provide an electronic device, including:

[0036] The memory is configured to store instructions; and

[0037] The processor is configured to retrieve the instructions from the memory and, when executing the instructions, to implement the method for determining the primary coolant flow rate provided in the first aspect of the embodiments of this application.

[0038] Fourthly, embodiments of this application provide a machine-readable storage medium storing instructions for causing a machine to execute the method for determining the primary coolant flow rate provided in the first aspect of embodiments of this application.

[0039] In this embodiment, under multiple main pump speed conditions, the main pump bypass flow rate corresponding to each main pump speed condition is obtained through main pump bypass measurement. The main pump speed and main pump bypass flow rate corresponding to each of the multiple main pump speed conditions are fitted to obtain a first relationship curve between the main pump speed and the main pump bypass flow rate. Then, using the primary loop model corresponding to the primary loop and multiple primary loop calibration coolant flow rates, a second relationship curve between the main pump speed and the primary loop calibration coolant flow rate is obtained. Finally, based on the first and second relationship curves, a third relationship curve between the main pump bypass flow rate and the primary loop calibration coolant flow rate is determined. This third relationship curve can be used to determine the primary loop coolant flow rate corresponding to the main pump bypass flow rate. In this way, when it is necessary to obtain the primary coolant flow rate, the primary coolant flow rate can be obtained by acquiring the primary main pump bypass flow rate and then finding the third relationship curve. There is no need to install a bend flow meter at the bend of the primary coolant flow rate to measure the primary coolant flow rate, thereby broadening the applicable scope of primary coolant flow rate measurement. This makes the embodiments of this application applicable to the measurement of primary coolant flow rate in compact reactors and improves the accuracy of primary coolant flow rate measurement. Attached Figure Description

[0040] Figure 1 This is a flowchart illustrating the method for determining the primary coolant flow rate provided in an embodiment of this application.

[0041] Figure 2 This is a schematic diagram of the structure of the primary loop flow measurement system provided in an embodiment of this application;

[0042] Figure 3 This is a schematic diagram of the bow-shaped baffle resistance component provided in an embodiment of this application;

[0043] Figure 4 This is a schematic diagram of the perforated bow-shaped baffle resistance component provided in the embodiments of this application;

[0044] Figure 5 This is a flowchart of a method for measuring primary loop flow provided in a specific embodiment of this application;

[0045] Figure 6 This is a schematic diagram of the structure of the device for determining the primary coolant flow rate provided in an embodiment of this application;

[0046] Figure 7 This is a schematic diagram of the arrangement of the primary loop flow measurement system provided in the embodiments of this application;

[0047] Figure 8 This is a schematic diagram of the structure of the electronic device provided in the embodiments of this application.

[0048] Explanation of reference numerals in the attached figures

[0049] 1. Core; 2. Pressure vessel; 3. Steam generator; 4. Main pump; 5. Main pump inlet pipeline; 6. Main pump outlet pipeline; 7. Main pump bypass pipeline; 8. Flow meter; 9. Main pump bypass resistance component. Detailed Implementation

[0050] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0051] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0052] The following description, in conjunction with the accompanying drawings, details the method and product for determining the primary coolant flow rate provided in this application through specific embodiments and application scenarios.

[0053] Please see Figure 1 This is a flowchart illustrating a method for determining the primary coolant flow rate provided in an embodiment of this application. The primary circuit includes a main pump and a main pump bypass. This determination method is applied to electronic equipment. Figure 1 As shown, the method for determining the primary coolant flow rate includes the following steps S100 to S400.

[0054] Step S100: The loop is operated under multiple main pump speed conditions, and the main pump bypass flow corresponding to the multiple main pump speed conditions is obtained by measuring the main pump bypass.

[0055] In this embodiment, the primary loop can be understood as the main coolant flow path from the nuclear reactor core to the main pump, then to the steam generator or other heat exchanger, and finally back to the reactor core. The primary loop includes the main pump and a main pump bypass. The main pump bypass can be understood as a bypass pipe that bypasses the main pump.

[0056] In one embodiment, each main pump speed condition corresponds to one main pump speed. The circuit can be operated at each main pump speed condition, and the main pump bypass flow rate corresponding to multiple main pump speed conditions can be obtained through main pump bypass measurement.

[0057] In some embodiments, a flow measurement device is provided in the main pump bypass to measure the flow rate of the main pump bypass. For example, the flow measurement device can be a flow meter. Under multiple main pump speed conditions, the main pump bypass flow rate corresponding to each main pump speed condition can be measured by the flow measurement device in the main pump bypass.

[0058] Step S200: Fit the main pump speed and main pump bypass flow rate corresponding to multiple main pump speed conditions to obtain the first relationship curve between main pump speed and main pump bypass flow rate;

[0059] In this embodiment, the main pump bypass flow rate corresponding to each main pump speed condition can be obtained through main pump bypass measurement. Then, by fitting the main pump speed and bypass flow rate corresponding to each of the multiple main pump speed conditions, a first relationship curve between the main pump speed and the main pump bypass flow rate can be obtained. During fitting, based on the main pump bypass flow rate corresponding to each main pump speed condition, the linear relationship between each main pump speed condition and the corresponding main pump bypass flow rate is determined, thereby determining the first relationship curve between the main pump speed and the main pump bypass flow rate.

[0060] Step S300: Using the primary loop model corresponding to the primary loop and multiple primary loop calibration coolant flow rates, obtain the second relationship curve between the main pump speed and the primary loop calibration coolant flow rate;

[0061] In this embodiment, the primary loop model can be understood as a model obtained by modeling the overall structure of the primary loop. The primary loop model includes the main equipment and main pipelines of the primary loop. For example, the main equipment of the primary loop may include, but is not limited to, the reactor core, pressurizer, and steam generator.

[0062] In some embodiments, the primary loop calibration coolant flow rate can be understood as the predetermined primary loop coolant flow rate input to the primary loop model.

[0063] In some embodiments, multiple primary loop calibration coolant flow rates are input into the primary loop model. After numerical simulation based on the primary loop calibration coolant flow rates, the primary loop model outputs the primary loop pressure drop corresponding to each primary loop calibration coolant flow rate. The primary loop pressure drop is then converted to obtain the head corresponding to the pressure drop. The head of the main pump refers to the liquid lifting height that the pump can provide. Based on the pump performance curve of the main pump, the main pump speed is calculated using the head conversion. Finally, a second relationship curve between the main pump speed and the primary loop calibration coolant flow rate can be obtained by fitting the primary loop calibration coolant flow rates and the corresponding main pump speeds.

[0064] Step S400: Based on the first and second relationship curves, determine the third relationship curve between the main pump bypass flow rate and the primary circuit calibration coolant flow rate. The third relationship curve is used to determine the primary circuit coolant flow rate corresponding to the main pump bypass flow rate.

[0065] In this embodiment of the application, after obtaining the first relationship curve between the main pump speed and the main pump bypass flow rate, and the second relationship curve between the main pump speed and the primary circuit calibration coolant flow rate, the first relationship curve and the second relationship curve are combined and simplified to obtain the third relationship curve between the main pump bypass flow rate and the primary circuit calibration coolant flow rate.

[0066] In some embodiments, the first relationship curve can be represented as N = f1(QP), and the second relationship curve can be represented as N = f2(QM). Combining the first and second relationship curves eliminates the main pump speed N, resulting in the third relationship curve QP = f3(QM). Here, N represents the main pump speed, QP represents the main pump bypass flow rate, QM represents the primary loop calibration coolant flow rate, and f1, f2, and f3 represent constant coefficients.

[0067] In some embodiments, the third relationship curve is used to determine the primary coolant flow rate corresponding to the main pump bypass flow rate. The third relationship curve is a curve showing the relationship between the main pump bypass flow rate and the primary coolant calibration flow rate. The primary coolant calibration flow rate in the third relationship curve only represents the primary coolant flow rate used to determine the curve. In the application of the third relationship curve, the primary coolant flow rate corresponding to the main pump bypass flow rate can be directly determined based on the main pump bypass flow rate.

[0068] In some embodiments, after detecting the main pump bypass flow rate, the main pump bypass flow rate is substituted into the third relationship curve to obtain the primary coolant flow rate corresponding to the main pump bypass flow rate.

[0069] Through steps S100-S400, the main pump bypass flow rate corresponding to each main pump speed condition is obtained by measuring the main pump bypass flow rate under multiple main pump speed conditions. The main pump speed and bypass flow rate corresponding to each of the multiple main pump speed conditions are fitted to obtain a first relationship curve between the main pump speed and the main pump bypass flow rate. Then, using the primary loop model corresponding to the primary loop and multiple primary loop calibration coolant flow rates, a second relationship curve between the main pump speed and the primary loop calibration coolant flow rate is obtained. Finally, based on the first and second relationship curves, a third relationship curve between the main pump bypass flow rate and the primary loop calibration coolant flow rate is determined. This third relationship curve can be used to determine the primary loop coolant flow rate corresponding to the main pump bypass flow rate. In this way, when it is necessary to obtain the primary coolant flow rate, the primary coolant flow rate can be obtained by acquiring the primary main pump bypass flow rate and then finding the third relationship curve. There is no need to install a bend flow meter at the bend of the primary coolant flow rate to measure the primary coolant flow rate, thereby broadening the applicable scope of primary coolant flow rate measurement. This makes the embodiments of this application applicable to the measurement of primary coolant flow rate in compact reactors and improves the accuracy of primary coolant flow rate measurement.

[0070] In some implementations, a second relationship curve between the main pump speed and the primary loop calibration coolant flow rate is obtained using a primary loop model and multiple primary loop calibration coolant flow rates, including:

[0071] Within a preset range of the primary coolant flow rate, obtain multiple primary coolant flow rates;

[0072] Multiple primary loop calibration coolant flow rates are input into the primary loop model corresponding to the primary loop to obtain the primary loop pressure drop corresponding to the multiple primary loop calibration coolant flow rates.

[0073] Determine the main pump speed corresponding to the rated coolant flow rate of each primary circuit based on the primary circuit pressure drop corresponding to the primary circuit rated coolant flow rate.

[0074] The second relationship curve between the main pump speed and the primary circuit calibration coolant flow rate is determined based on the primary circuit calibration coolant flow rate and the main pump speed corresponding to the primary circuit calibration coolant flow rate.

[0075] Specifically, the overall structure of the primary loop is first modeled to obtain the primary loop model. The primary loop model may include, but is not limited to, the main equipment and main pipelines of the primary loop. The inlet boundary of the primary loop model can be set as the pipeline at the outlet of the main pump, and the outlet of the primary loop model can be set as the pipeline at the inlet of the main pump.

[0076] In some embodiments, the preset range of the primary coolant flow rate can be understood as the range of the primary coolant flow rate corresponding to the power range of the nuclear power unit. For example, between the primary coolant flow rate Q100FP and the minimum flow rate Q0FP corresponding to the full power platform of the nuclear power unit, multiple primary calibration coolant flow rates (QM1, QM2 to QMx) are set and set at the inlet boundary of the primary model as the input of the primary model.

[0077] In some embodiments, under different power platforms, a second relationship curve between the main pump speed and the primary loop coolant flow rate can be obtained by calibrating the main pump speed and the primary loop calibrated coolant flow rate. Numerical simulations are then performed on multiple primary loop calibrated coolant flow rates using a primary loop model. After the simulation is complete, the primary loop model can output the primary loop pressure drops ΔPM1, ΔPM2 to ΔPMx corresponding to each primary loop calibrated coolant flow rate. The primary loop pressure drop can be understood as the pressure difference between the inlet and outlet boundaries of the primary loop model.

[0078] In some embodiments, after obtaining the primary circuit pressure drop corresponding to the rated coolant flow rate of each primary circuit, the main pump speed corresponding to the rated coolant flow rate of each primary circuit is determined based on the primary circuit pressure drop. When converting the primary circuit pressure drop, it can be done by converting the primary circuit pressure drop to head, and then converting the head to the main pump speed based on the pump performance curve of the main pump. The pump performance curve of the main pump can be understood as the relationship curve between the main pump speed and the head.

[0079] In some embodiments, after determining the main pump speed corresponding to the rated coolant flow rate of each primary loop, the rated coolant flow rate of each primary loop and the corresponding main pump speed are fitted to obtain a second relationship curve between the main pump speed and the rated coolant flow rate of the primary loop. Polynomial fitting, nonlinear fitting, or other methods can be used for fitting.

[0080] By determining the second relationship curve between the main pump speed and the primary circuit calibrated coolant flow rate, it can be used to determine the third relationship curve between the main pump bypass flow rate and the primary circuit calibrated coolant flow rate.

[0081] In some implementations, the main pump speed corresponding to the rated coolant flow rate of each primary circuit is determined based on the primary circuit pressure drop corresponding to the primary circuit rated coolant flow rate, including:

[0082] Obtain the fourth relationship curve between the main pump speed and the head;

[0083] Determine the head corresponding to the primary loop calibrated coolant flow rate based on the primary loop pressure drop corresponding to the primary loop calibrated coolant flow rate.

[0084] Based on the fourth relationship curve, the main pump speed corresponding to the rated coolant flow rate of each primary loop is determined.

[0085] Specifically, when converting the primary circuit voltage drop, it can be done by converting the primary circuit voltage drop into head, and then, based on the main pump's performance curve, converting the head into the main pump speed. The main pump's performance curve can be understood as the relationship curve between the main pump speed and head, i.e., the fourth relationship curve. The fourth relationship curve between the main pump speed and head is an inherent property of the main pump.

[0086] In some embodiments, the primary loop pressure drop can be determined based on the primary loop calibration coolant flow rate. Then, based on the conversion relationship between pressure drop and head, the primary loop pressure drop corresponding to the primary loop calibration coolant flow rate is converted into the head corresponding to the primary loop calibration coolant flow rate. The conversion relationship between pressure drop and head can be expressed as:

[0087]

[0088] Where Hx represents the head corresponding to the calibration coolant flow rate of the x-th group of primary loops, ΔPMx represents the pressure drop corresponding to the calibration coolant flow rate of the x-th group of primary loops, ρ represents the density of the primary loop coolant, g represents the acceleration due to gravity, and v out Indicates the main pump outlet velocity, v in z represents the inlet velocity of the main pump. out Indicates the height of the main pump outlet, z in This indicates the height of the main pump inlet.

[0089] After determining the head corresponding to the primary loop calibrated coolant flow rate, the main pump speed corresponding to the primary loop calibrated coolant flow rate can be obtained based on the fourth relationship curve between the main pump speed and the head.

[0090] By converting the primary circuit pressure drop into head, and then determining the main pump speed corresponding to the rated coolant flow rate of each primary circuit based on the fourth relationship curve, it can be used to determine the third relationship curve between the main pump bypass flow rate and the rated coolant flow rate of the primary circuit.

[0091] In some implementations, before obtaining the second relationship curve between the main pump speed and the primary loop calibration coolant flow rate using a primary loop corresponding to a primary loop model and multiple primary loop calibration coolant flow rates, the determination method further includes:

[0092] Based on the structure of the primary loop, a primary loop model corresponding to the primary loop is constructed. The input of the primary loop model is the primary loop calibration coolant flow rate, and the output of the primary loop model is the primary loop pressure drop corresponding to the primary loop calibration coolant flow rate.

[0093] Specifically, the primary loop model refers to a model built based on the overall structure of the primary loop. The primary loop model can include the main equipment and main pipelines of the primary loop. The main equipment of the primary loop may include, but is not limited to, the reactor core, pressurizer, and steam generator. The inlet boundary of the model can be set as the pipeline at the main pump outlet, and the outlet of the model can be set as the pipeline at the main pump inlet.

[0094] In some embodiments, the input to the primary loop model is the primary loop calibration coolant flow rate, and the output of the primary loop model is the primary loop pressure drop corresponding to the primary loop calibration coolant flow rate. That is, based on the primary loop model, the primary loop pressure drop corresponding to the primary loop calibration coolant flow rate can be determined.

[0095] By constructing a primary loop model, the main pump speed and the primary loop calibration coolant flow rate can be calibrated, which can then be used to determine the third relationship curve between the main pump bypass flow rate and the primary loop calibration coolant flow rate.

[0096] In some implementations, before acquiring multiple primary loop calibration coolant flow rates within a preset range of the primary loop coolant flow rate, the following steps are included:

[0097] Obtain the maximum primary coolant flow rate of the target nuclear power unit under full-power platform conditions;

[0098] Obtain the minimum primary coolant flow rate of the target nuclear power unit under zero-power platform conditions;

[0099] Based on the minimum and maximum primary coolant flow rates, a preset range for the primary coolant flow rate is determined.

[0100] Specifically, the preset range of the primary coolant flow rate can be understood as the primary coolant flow rate range corresponding to the power range of the nuclear power unit. The maximum primary coolant flow rate of the target nuclear power unit under full-power conditions and the minimum primary coolant flow rate of the target nuclear power unit under zero-power conditions are obtained respectively. The preset range of the primary coolant flow rate is then determined based on the maximum and minimum primary coolant flow rates.

[0101] By determining a preset range for the primary coolant flow rate, a reasonable primary coolant flow rate can be obtained within the preset range, thereby improving the accuracy of the primary coolant flow rate measurement.

[0102] In some embodiments, after determining the third relationship curve between the main pump bypass flow rate and the primary loop calibration coolant flow rate based on the first and second relationship curves, the determination method further includes:

[0103] Obtain real-time main pump bypass flow;

[0104] Based on the third relationship curve, the primary coolant flow rate corresponding to the real-time main pump bypass flow rate is determined.

[0105] Specifically, after obtaining the third relationship curve between the main pump bypass flow rate and the primary circuit calibration coolant flow rate, the primary circuit coolant flow rate corresponding to the main pump bypass flow rate can be determined in real time based on the third relationship curve. By substituting the real-time detected main pump bypass flow rate into the third relationship curve, the primary circuit coolant flow rate corresponding to the real-time main pump bypass flow rate can be determined.

[0106] In some implementations, the main pump bypass includes a flow meter, a resistance element, and a pipeline. The resistance element is disposed in the pipeline of the main pump bypass, and the flow meter is disposed downstream of the resistance element. The resistance element is used to regulate the pressure drop of the main pump bypass, and the flow meter is used to collect the flow rate of the main pump bypass.

[0107] Specifically, please see Figure 2 This is a schematic diagram of the primary flow measurement system provided in this application embodiment. The main pump bypass may include a flow meter and a resistance element. The flow meter can be used to collect the main pump bypass flow. The resistance element can be used to increase the pressure drop of the main pump bypass, thereby controlling the fluid velocity in the main pump bypass within the preset range of the flow meter.

[0108] In some embodiments, the flow meter can be arranged downstream of the resistance element in the main pump bypass pipeline, i.e., on the side close to the main pump inlet. Depending on the actual working fluid type, temperature, and pressure, different types of flow meters, such as turbine flow meters, orifice plate flow meters, and Coriolis flow meters, can be selected. The placement of the flow meter can also be determined based on the pressure requirements of its operation.

[0109] In some embodiments, the resistance element can be an arc-shaped baffle arranged in the main pump bypass pipeline to increase the pressure drop in the main pump bypass, thereby controlling the fluid velocity in the main pump bypass within the preset range of the flow meter. The specific shape and number of the arc-shaped baffles can be adjusted according to actual needs for different types of nuclear reactors, and openings can be made if necessary. Please refer to [link to relevant documentation]. Figure 3 This is a schematic diagram of the bow-shaped baffle resistance component provided in an embodiment of this application. Please refer to... Figure 4 This is a schematic diagram of the perforated bow-shaped baffle resistance component provided in the embodiments of this application.

[0110] By installing flow meters and resistance components, real-time measurement of the coolant flow rate in the reactor's primary loop can be achieved without relying on a bend in the pipe structure, ensuring the safe operation of the reactor and improving the accuracy of the measurement.

[0111] For easier understanding, please refer to Figure 5 This is a flowchart of a method for measuring primary loop flow provided in a specific embodiment of this application. Figure 5As shown, the determination method may include:

[0112] Step S501: Measure the flow rate of the main pump bypass.

[0113] Step S502: Curve A showing the relationship between main pump speed and main pump bypass flow rate.

[0114] Step S503: Perform calibration under different power platforms.

[0115] Step S504: Curve B showing the relationship between main pump speed and primary circuit flow rate.

[0116] Step S505: Curve C showing the relationship between the main pump bypass flow rate and the primary circuit flow rate.

[0117] Step S506: Measure the main pump bypass flow rate in real time.

[0118] Step S507: Calculate the primary loop flow in real time.

[0119] In this specific embodiment, the specific implementation can be found in the foregoing description, and will not be repeated here.

[0120] Please see Figure 6 This is a schematic diagram of the structure of a device for determining the primary coolant flow rate provided in an embodiment of this application. A second aspect of this application provides a device 60 for determining the primary coolant flow rate, the device 60 comprising:

[0121] Measurement module 61 is used to obtain the main pump bypass flow rate corresponding to the main pump speed condition through main pump bypass measurement under multiple main pump speed conditions.

[0122] The fitting module 62 is used to fit the main pump speed and main pump bypass flow rate corresponding to multiple main pump speed conditions to obtain the first relationship curve between the main pump speed and the main pump bypass flow rate.

[0123] The first determining module 63 is used to obtain a second relationship curve between the main pump speed and the primary circuit calibration coolant flow rate by using the primary circuit model corresponding to the primary circuit and multiple primary circuit calibration coolant flow rates.

[0124] The second determining module 64 is used to determine a third relationship curve between the main pump bypass flow rate and the primary circuit calibration coolant flow rate based on the first relationship curve and the second relationship curve. The third relationship curve is used to determine the primary circuit coolant flow rate corresponding to the main pump bypass flow rate based on the main pump bypass flow rate.

[0125] The device 50 for determining the primary coolant flow rate provided in the second aspect of this application can realize the various processes implemented in the above method embodiments and achieve the same beneficial effects. To avoid repetition, it will not be described again here.

[0126] Please see Figure 7 This is a structural schematic diagram of the arrangement of the primary loop flow measurement system provided in an embodiment of this application. For example... Figure 7 As shown, the primary loop flow measurement system includes: reactor core 1; pressure vessel 2; steam generator 3; main pump 4; main pump inlet pipeline 5; main pump outlet pipeline 6; main pump bypass pipeline 7; flow meter 8; and main pump bypass resistance component 9.

[0127] Please see Figure 8 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. A third aspect of this application provides an electronic device 8000, including a processor 8100 and a memory 8200. The memory 8200 stores machine-executable instructions that can be executed by the processor 8100. The processor 8100 can execute the machine-executable instructions to implement the above-mentioned method for determining the primary coolant flow rate.

[0128] A fourth aspect of this application provides a machine-readable storage medium storing instructions that, when executed by a processor, cause the processor to implement the aforementioned method for determining the primary coolant flow rate.

[0129] In some embodiments, this application also provides a computer program product, including a computer program that, when executed by a processor, implements a method for determining the primary coolant flow rate according to the above embodiments.

[0130] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0131] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 a process or multiple processes and / or boxes Figure 1The computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 a process or multiple processes and / or boxes Figure 1 The functions specified in one or more boxes. These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable apparatus for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0132] In a typical configuration, a computing device includes one or more processors (CPU), input / output interfaces, network interfaces, and memory.

[0133] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0134] Computer-readable media includes permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. The information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory computer-readable media (transitory media), such as modulated data signals and carrier waves.

[0135] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0136] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

[0137] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A method for determining the primary coolant flow rate, characterized in that, The primary circuit includes the main pump and the main pump bypass, and the determination method includes: The circuit is operated under multiple main pump speed conditions, and the main pump bypass flow rate corresponding to the multiple main pump speed conditions is obtained by measuring the main pump bypass. The main pump speed and main pump bypass flow rate corresponding to the multiple main pump speed conditions are fitted to obtain the first relationship curve between the main pump speed and the main pump bypass flow rate. Using the first-loop model corresponding to the first loop and multiple first-loop calibration coolant flow rates, a second relationship curve between the main pump speed and the first-loop calibration coolant flow rate is obtained; Based on the first relationship curve and the second relationship curve, a third relationship curve is determined between the main pump bypass flow rate and the primary loop calibration coolant flow rate. The third relationship curve is used to determine the primary loop coolant flow rate corresponding to the main pump bypass flow rate.

2. The determination method according to claim 1, characterized in that, The step of obtaining a second relationship curve between the main pump speed and the primary circuit calibration coolant flow rate using the primary circuit model corresponding to the primary circuit and multiple primary circuit calibration coolant flow rates includes: Within a preset range of the primary loop coolant flow rate, the plurality of primary loop calibration coolant flow rates are obtained; The multiple primary loop calibration coolant flow rates are respectively input into the primary loop model corresponding to the primary loop to obtain the primary loop pressure drop corresponding to the multiple primary loop calibration coolant flow rates; Determine the main pump speed corresponding to the rated coolant flow rate of each primary circuit based on the primary circuit pressure drop corresponding to the primary circuit rated coolant flow rate. Based on the rated coolant flow rate of each primary loop and the main pump speed corresponding to the rated coolant flow rate of each primary loop, a second relationship curve between the main pump speed and the rated coolant flow rate of the primary loop is determined.

3. The determination method according to claim 2, characterized in that, The step of determining the main pump speed corresponding to the rated coolant flow rate of each primary circuit based on the primary circuit pressure drop corresponding to the rated coolant flow rate of each primary circuit includes: Obtain the fourth relationship curve between the main pump speed and the head of the main pump; The head corresponding to the primary loop calibrated coolant flow rate is determined based on the primary loop pressure drop corresponding to the primary loop calibrated coolant flow rate. Based on the fourth relationship curve, the main pump speed corresponding to the rated coolant flow rate of each loop is determined.

4. The determination method according to claim 1, characterized in that, Before obtaining the second relationship curve between the main pump speed and the primary loop calibration coolant flow rate using the primary loop model corresponding to the primary loop and multiple primary loop calibration coolant flow rates, the determination method further includes: Based on the structure of the first loop, a first loop model corresponding to the first loop is constructed, wherein the input of the first loop model is the first loop calibration coolant flow rate, and the output of the first loop model is the first loop pressure drop corresponding to the first loop calibration coolant flow rate.

5. The determination method according to claim 2, characterized in that, Before obtaining multiple primary loop calibration coolant flow rates within the preset range of the primary loop coolant flow rate, the determination method further includes: Obtain the maximum primary coolant flow rate of the target nuclear power unit under full-power platform conditions; Obtain the minimum primary coolant flow rate of the target nuclear power unit under zero-power platform conditions; Based on the minimum primary coolant flow rate and the maximum primary coolant flow rate, a preset range for the primary coolant flow rate is determined.

6. The determination method according to claim 1, characterized in that, After determining the third relationship curve between the main pump bypass flow rate and the primary loop calibration coolant flow rate based on the first and second relationship curves, the determination method further includes: Obtain real-time main pump bypass flow; Based on the third relationship curve, the primary coolant flow rate corresponding to the real-time main pump bypass flow rate is determined.

7. The determination method according to claim 1, characterized in that, The main pump bypass includes a flow meter, a resistance element, and a pipeline. The resistance element is installed in the pipeline of the main pump bypass, and the flow meter is installed downstream of the resistance element. The resistance element is used to adjust the pressure drop of the main pump bypass, and the flow meter is used to collect the flow rate of the main pump bypass.

8. A device for determining the flow rate of a primary coolant circuit, characterized in that, The primary circuit includes a main pump and a main pump bypass, and the determining device includes: The measurement module is used to operate the primary circuit under multiple main pump speed conditions and obtain the main pump bypass flow corresponding to the multiple main pump speed conditions through the main pump bypass measurement. The fitting module is used to fit the main pump speed and main pump bypass flow rate corresponding to the multiple main pump speed conditions respectively, and obtain the first relationship curve between the main pump speed and the main pump bypass flow rate. The first determining module is used to obtain a second relationship curve between the main pump speed and the primary circuit calibration coolant flow rate by using the primary circuit model corresponding to the primary circuit and multiple primary circuit calibration coolant flow rates. The second determining module is used to determine a third relationship curve between the main pump bypass flow rate and the primary loop calibration coolant flow rate based on the first relationship curve and the second relationship curve. The third relationship curve is used to determine the primary loop coolant flow rate corresponding to the main pump bypass flow rate based on the main pump bypass flow rate.

9. An electronic device, characterized in that, include: The memory is configured to store instructions; as well as The processor is configured to retrieve the instructions from the memory and, when executing the instructions, to implement the method for determining the primary coolant flow rate according to any one of claims 1 to 7.

10. A machine-readable storage medium, characterized in that, The machine-readable storage medium stores instructions for causing the machine to perform a method for determining the primary coolant flow rate according to any one of claims 1 to 7.

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