Primary loop coolant flow determination method and product

Abstract

The invention provides a primary loop coolant flow determination method and a product, and relates to the technical field of nuclear power. The method comprises the steps that a loop operates under the multiple main pump rotating speed working conditions, and main pump bypass flow corresponding to the multiple main pump rotating speed working conditions is obtained through main pump bypass measurement. Fitting the rotating speed of the main pump and the bypass flow of the main pump to obtain a first relation curve; and a second relation curve of the main pump rotating speed and the primary loop calibrated coolant flow is obtained by using a primary loop model corresponding to the primary loop and the plurality of primary loop calibrated coolant flows. And according to the first relation curve and the second relation curve, a third relation curve of the main pump bypass flow and the primary loop calibration coolant flow is determined. The third relation curve is used for determining the corresponding primary loop coolant flow according to the main pump bypass flow. Thus, the primary loop coolant flow is obtained by determining the main pump bypass flow and searching the third relation curve, and the accuracy of primary loop coolant flow measurement can be improved.

Description

Technical Field

[0001] The present invention relates to the field of nuclear power technology, and in particular to a method and product for determining a primary-loop coolant flow rate. Background Art

[0002] The primary coolant flow rate of the reactor is one of the main thermal safety parameters that need to be focused on in the design and operation of nuclear power units. The primary coolant flow rate should always be guaranteed to match the power of the nuclear reactor. Therefore, it is necessary to measure the primary coolant flow rate of the reactor in real time and accurately.

[0003] At present, in nuclear power units, elbow flowmeters are generally used to measure the primary coolant flow rate. However, since this type of measurement method requires the arrangement of an elbow flowmeter at the elbow, it is limited by the pipeline layout and space size, and may not be applicable in compact reactors, resulting in low accuracy in the primary coolant flow measurement.

[0004] Therefore, how to improve the accuracy of primary-circuit coolant flow measurement has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] The purpose of the embodiments of the present application is to provide a method and product for determining the flow rate of a primary coolant circuit, so that the accuracy of measuring the flow rate of the primary coolant circuit can be improved.

[0006] In a first aspect, an embodiment of the present application provides a method for determining a flow rate of a primary coolant, the method comprising:

[0007] A circuit is operated under multiple main pump speed conditions, and the main pump bypass flow corresponding to the multiple main pump speed conditions is obtained through main pump bypass measurement;

[0008] Fitting the main pump speeds and the main pump bypass flow rates corresponding to a plurality of main pump speed conditions respectively to obtain a first relationship curve between the main pump speed and the main pump bypass flow rate;

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

[0010] A third relationship curve between the main pump bypass flow and the primary circuit calibrated coolant flow is determined based on the first relationship curve and the second relationship curve. The third relationship curve is used to determine the primary circuit coolant flow corresponding to the main pump bypass flow based on the main pump bypass flow.

[0011] In some embodiments, a first circuit model corresponding to a first circuit and a plurality of first circuit calibrated coolant flow rates are used to obtain a second relationship curve between the main pump speed and the first circuit calibrated coolant flow rate, including:

[0012] Within a preset range of the primary circuit coolant flow rate, obtaining a plurality of primary circuit calibrated coolant flow rates;

[0013] Inputting a plurality of primary circuit calibration coolant flow rates into a primary circuit model corresponding to a primary circuit respectively, and obtaining a primary circuit pressure drop corresponding to the plurality of primary circuit calibration coolant flow rates;

[0014] Determine the main pump speed corresponding to each primary circuit calibrated coolant flow rate according to the primary circuit pressure drop corresponding to each primary circuit calibrated coolant flow rate;

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

[0016] In some embodiments, determining the main pump speed corresponding to each primary circuit calibrated coolant flow rate according to the primary circuit pressure drop corresponding to each primary circuit calibrated coolant flow rate includes:

[0017] Obtaining a fourth relationship curve between the main pump speed and the lift of the main pump;

[0018] According to the primary circuit pressure drop corresponding to the primary circuit calibrated coolant flow rate, the head corresponding to the primary circuit calibrated coolant flow rate is determined;

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

[0020] In some embodiments, before obtaining a second relationship curve between the main pump speed and the primary circuit calibrated coolant flow rate using the primary circuit model corresponding to the primary circuit and a plurality of primary circuit calibrated coolant flow rates, the determination method further includes:

[0021] According to the structure of the primary loop, a primary loop model corresponding to the primary loop is constructed, wherein the input of the primary loop model is the primary loop calibrated coolant flow rate, and the output of the primary loop model is the primary loop pressure drop corresponding to the primary loop calibrated coolant flow rate.

[0022] In some embodiments, before obtaining a plurality of primary circuit calibrated coolant flow rates within a preset range of the primary circuit coolant flow rate, the method includes:

[0023] Obtain the maximum primary circuit coolant flow rate corresponding to the target nuclear power unit at the full power platform;

[0024] Obtain the minimum primary coolant flow rate corresponding to the target nuclear power unit at the zero power platform;

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

[0026] In some embodiments, after determining a third relationship curve between the bypass flow of the main pump and the calibrated coolant flow of the primary circuit according to the first relationship curve and the second relationship curve, the determination method further includes:

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

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

[0029] In some embodiments, the main pump bypass includes a flow meter, a resistance element and a pipeline. The resistance element is arranged in the pipeline of the main pump bypass, and the flow meter is arranged 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 main pump bypass flow.

[0030] In a second aspect, an embodiment of the present application provides a device for determining a flow rate of a primary coolant, the device comprising:

[0031] A measuring module is used to obtain the bypass flow of the main pump corresponding to the main pump speed condition through the main pump bypass measurement under multiple main pump speed conditions;

[0032] A fitting module, used for fitting the main pump speed and the main pump bypass flow corresponding to a plurality of main pump speed conditions, to obtain a first relationship curve between the main pump speed and the main pump bypass flow;

[0033] A first determination module is used to obtain a second relationship curve between the main pump speed and the primary circuit calibrated coolant flow rate by using a primary circuit model corresponding to the primary circuit and a plurality of primary circuit calibrated coolant flow rates;

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

[0035] In a third aspect, an embodiment of the present application provides an electronic device, including:

[0036] a memory configured to store instructions; and

[0037] The processor is configured to call the instruction from the memory and implement the method for determining the flow rate of a circuit coolant provided in the first aspect of the embodiment of the present application when executing the instruction.

[0038] In a fourth aspect, an embodiment of the present application provides a machine-readable storage medium, on which instructions are stored, and the instructions are used to enable a machine to execute the method for determining the flow rate of a single-circuit coolant provided in the first aspect of the embodiment of the present application.

[0039] In an embodiment of the present application, under multiple main pump speed conditions, the main pump bypass flow corresponding to the main pump speed condition is obtained by measuring the main pump bypass. The main pump speeds and main pump bypass flows corresponding to 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. Then, a first-loop model corresponding to a first loop and multiple first-loop calibrated coolant flows are used to obtain a second relationship curve between the main pump speed and the first-loop calibrated coolant flow. Finally, based on the first relationship curve and the second relationship curve, a third relationship curve between the main pump bypass flow and the first-loop calibrated coolant flow is determined, and the third relationship curve can be used to determine the first-loop coolant flow corresponding to the main pump bypass flow based on the main pump bypass flow. In this way, when it is necessary to obtain the coolant flow rate of a single circuit, the coolant flow rate of the single circuit can be obtained by obtaining the bypass flow rate of the main pump of the single circuit and then searching the third relationship curve. There is no need to arrange a bend flowmeter at the bend of the single circuit to measure the coolant flow rate of the single circuit, thereby broadening the scope of application of the coolant flow rate measurement of the single circuit, making the embodiment of the present application suitable for the measurement of the coolant flow rate of the single circuit of a compact reactor, thereby improving the accuracy of the coolant flow rate measurement of the single circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a flow chart of a method for determining a primary circuit coolant flow rate provided in an embodiment of the present application;

[0041] Figure 2 It is a structural schematic diagram of a primary circuit flow measurement system provided in an embodiment of the present application;

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

[0043] Figure 4 is a schematic diagram of an open-hole arched baffle resistance member provided in an embodiment of the present application;

[0044] Figure 5 It is a flow chart of a method for measuring a flow rate of a circuit provided by a specific embodiment of the present application;

[0045] Figure 6 It is a structural schematic diagram of a device for determining a primary circuit coolant flow rate provided in an embodiment of the present application;

[0046] Figure 7 It is a structural schematic diagram of the arrangement of a primary circuit flow measurement system provided in an embodiment of the present application;

[0047] Figure 8 It is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application.

[0048] Description of Reference Numerals

[0049] 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; main pump bypass resistance 9. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0051] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0052] In conjunction with the accompanying drawings, the method and product for determining the flow rate of a circuit coolant provided by the embodiment of the present application are described in detail through specific embodiments and their application scenarios.

[0053] See also Figure 1 , is a flow chart of a method for determining a coolant flow rate of a circuit provided in an embodiment of the present application, wherein the circuit includes a main pump and a main pump bypass, and the determination method is applied to electronic equipment. Figure 1 As shown, the method for determining the flow rate of the primary circuit coolant includes the following steps S100 to S400.

[0054] Step S100: operating a circuit under multiple main pump speed conditions, and obtaining the main pump bypass flow corresponding to the multiple main pump speed conditions through main pump bypass measurement.

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

[0056] In one embodiment, each main pump speed condition corresponds to a main pump speed. A circuit can be operated in each main pump speed condition, and main pump bypass flow 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 for measuring the flow of the main pump bypass. For example, the flow measurement device may be a flow meter. Under multiple main pump speed conditions, the main pump bypass flow corresponding to each main pump speed condition can be measured by the flow measurement device in the main pump bypass.

[0058] Step S200: fitting the main pump speeds and the main pump bypass flows corresponding to a plurality of main pump speed conditions to obtain a first relationship curve between the main pump speed and the main pump bypass flow;

[0059] In the embodiment of the present application, the main pump bypass flow corresponding to each main pump speed condition can be obtained by measuring the main pump bypass. Then, the main pump speed and the main pump bypass flow corresponding to 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. During the fitting, the linear relationship between each main pump speed condition and the corresponding main pump bypass flow is determined according to the main pump bypass flow corresponding to each main pump speed condition, and then the first relationship curve between the main pump speed and the main pump bypass flow can be determined.

[0060] Step S300: using a primary circuit model corresponding to a primary circuit and a plurality of primary circuit calibrated coolant flow rates, obtaining a second relationship curve between the main pump speed and the primary circuit calibrated coolant flow rate;

[0061] In the embodiment of the present application, the primary loop model corresponding to the primary loop can be understood as a model obtained by modeling based on the overall structure of the primary loop. In the primary loop model, the main equipment of the primary loop and the main pipeline of the primary loop are included. For example, the main equipment of the primary loop may include but is not limited to the core, the pressurizer, and the steam generator.

[0062] In some embodiments, the primary circuit calibrated coolant flow rate may be understood as a primary circuit coolant flow rate that is predetermined as an input to the primary circuit model.

[0063] In some embodiments, multiple first-loop calibrated coolant flow rates are respectively input into the first-loop model. After numerical simulation is performed inside the first-loop model based on the first-loop calibrated coolant flow rate, the first-loop pressure drop corresponding to each first-loop calibrated coolant flow rate can be output. The first-loop pressure drop is then converted to obtain the head corresponding to the first-loop pressure drop. The head of the main pump refers to the liquid lifting height that the pump can provide. According to the pump performance curve of the main pump, the main pump speed is obtained by head conversion. Finally, the second relationship curve between the main pump speed and the first-loop calibrated coolant flow rate can be obtained by fitting each first-loop calibrated coolant flow rate and the main pump speed corresponding to each first-loop calibrated coolant flow rate.

[0064] Step S400: Determine a third relationship curve between the main pump bypass flow and the primary circuit calibrated coolant flow according to the first relationship curve and the second relationship curve, wherein the third relationship curve is used to determine the primary circuit coolant flow corresponding to the main pump bypass flow according to the main pump bypass flow.

[0065] In an embodiment of the present application, after obtaining the first relationship curve between the main pump speed and the main pump bypass flow, and the second relationship curve between the main pump speed and the first-circuit calibrated coolant flow, 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 and the first-circuit calibrated coolant flow.

[0066] In some embodiments, the first relationship curve can be expressed as N=f1(QP), and the second relationship curve can be expressed as N=f2(QM). The first relationship curve and the second relationship curve are combined to eliminate the main pump speed N. A third relationship curve QP=f3(QM) is obtained. Among them, N represents the main pump speed, QP represents the main pump bypass flow, QM represents the primary circuit calibrated coolant flow, and f1, f2, and f3 represent constant coefficients.

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

[0068] In some embodiments, after the bypass flow of the main pump is detected, the bypass flow of the main pump is substituted into the third relationship curve, and the primary circuit coolant flow corresponding to the bypass flow of the main pump can be obtained.

[0069] Through the above steps S100 to S400, under multiple main pump speed conditions, the main pump bypass flow corresponding to the main pump speed condition is obtained by measuring the main pump bypass. The main pump speeds and main pump bypass flows corresponding to 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. Then, using a single-loop model corresponding to a single loop and multiple single-loop calibrated coolant flows, a second relationship curve between the main pump speed and the single-loop calibrated coolant flow is obtained. Finally, based on the first relationship curve and the second relationship curve, a third relationship curve between the main pump bypass flow and the single-loop calibrated coolant flow is determined. The third relationship curve can be used to determine the single-loop coolant flow corresponding to the main pump bypass flow based on the main pump bypass flow. In this way, when it is necessary to obtain the coolant flow rate of a single circuit, the coolant flow rate of the single circuit can be obtained by obtaining the bypass flow rate of the main pump of the single circuit and then searching the third relationship curve. There is no need to arrange a bend flowmeter at the bend of the single circuit to measure the coolant flow rate of the single circuit, thereby broadening the scope of application of the coolant flow rate measurement of the single circuit, making the embodiment of the present application suitable for the measurement of the coolant flow rate of the single circuit of a compact reactor, thereby improving the accuracy of the coolant flow rate measurement of the single circuit.

[0070] In some embodiments, a first circuit model corresponding to a first circuit and a plurality of first circuit calibrated coolant flow rates are used to obtain a second relationship curve between the main pump speed and the first circuit calibrated coolant flow rate, including:

[0071] Within a preset range of the primary circuit coolant flow rate, obtaining a plurality of primary circuit calibrated coolant flow rates;

[0072] Inputting a plurality of primary circuit calibration coolant flow rates into a primary circuit model corresponding to a primary circuit respectively, and obtaining a primary circuit pressure drop corresponding to the plurality of primary circuit calibration coolant flow rates;

[0073] Determine the main pump speed corresponding to each primary circuit calibrated coolant flow rate according to the primary circuit pressure drop corresponding to each primary circuit calibrated coolant flow rate;

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

[0075] Specifically, the overall structure of the primary loop is firstly modeled to obtain a primary loop model. The primary loop model may include but is not limited to the main equipment of the primary loop and the main pipeline of the primary loop. The inlet boundary of the primary loop model may be set to the pipeline at the outlet of the main pump, and the outlet of the primary loop model may be set to 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 primary coolant flow rate range corresponding to the power range of the nuclear power unit. For example, between the primary coolant flow rate Q100FP corresponding to the full power platform of the nuclear power unit and the minimum flow rate Q0FP, multiple primary calibrated coolant flow rates (QM1, QM2 to QMx) are set and set at the inlet boundary of the primary loop model as the input of the primary loop model.

[0077] In some embodiments, under different power platforms, by calibrating the main pump speed and the primary circuit coolant flow rate, a second relationship curve between the main pump speed and the primary circuit calibrated coolant flow rate can be obtained. A plurality of primary circuit calibrated coolant flow rates are numerically simulated by a primary circuit model. After the simulation is completed, the primary circuit model can output the primary circuit pressure drop ΔPM1, ΔPM2 to ΔPMx corresponding to each primary circuit calibrated coolant flow rate. The primary circuit pressure drop can be understood as the pressure difference between the inlet boundary and the outlet boundary of the primary circuit model.

[0078] In some embodiments, after obtaining the primary circuit pressure drop corresponding to each primary circuit calibrated coolant flow rate, the main pump speed corresponding to each primary circuit calibrated coolant flow rate is determined according to the primary circuit pressure drop corresponding to each primary circuit calibrated coolant flow rate. When converting the primary circuit pressure drop, the primary circuit pressure drop can be converted into a head, and then the head can be converted into the main pump speed according to the pump performance curve of the main pump. The pump performance curve of the main pump can be understood as a relationship curve between the main pump speed and the head of the main pump.

[0079] In some embodiments, after determining the main pump speed corresponding to each primary circuit calibration coolant flow rate, each primary circuit calibration coolant flow rate and the main pump speed corresponding to each primary circuit calibration coolant flow rate are fitted to obtain a second relationship curve between the main pump speed and the primary circuit calibration coolant flow rate. When fitting, polynomial fitting, nonlinear fitting, etc. can be used.

[0080] By determining the second relationship curve between the main pump rotation speed and the first-circuit calibrated coolant flow rate, it is possible to determine the third relationship curve between the main pump bypass flow rate and the first-circuit calibrated coolant flow rate.

[0081] In some embodiments, determining the main pump speed corresponding to each primary circuit calibrated coolant flow rate according to the primary circuit pressure drop corresponding to each primary circuit calibrated coolant flow rate includes:

[0082] Obtaining a fourth relationship curve between the main pump speed and the lift of the main pump;

[0083] According to the primary circuit pressure drop corresponding to the primary circuit calibrated coolant flow rate, the head corresponding to the primary circuit calibrated coolant flow rate is determined;

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

[0085] Specifically, when converting the primary circuit pressure drop, the primary circuit pressure drop can be converted into lift, and then the lift can be converted into the main pump speed according to 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 lift of the main pump, that is, the fourth relationship curve. The fourth relationship curve between the main pump speed and lift of the main pump is an inherent property of the main pump.

[0086] In some embodiments, the corresponding primary circuit pressure drop can be determined according to the primary circuit calibration coolant flow rate. Then, based on the conversion relationship between pressure drop and head, the primary circuit pressure drop corresponding to the primary circuit calibration coolant flow rate is converted into the head corresponding to the primary circuit 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 x-th group of primary circuit calibrated coolant flow, ΔPMx represents the pressure drop corresponding to the x-th group of primary circuit calibrated coolant flow, ρ represents the primary circuit coolant density, g represents the gravitational acceleration, v out Indicates the main pump outlet flow rate, v in Indicates the main pump inlet flow rate, z out Indicates the main pump outlet height, z in Indicates the main pump inlet height.

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

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

[0091] In some embodiments, before obtaining a second relationship curve between the main pump speed and the primary circuit calibrated coolant flow rate using the primary circuit model corresponding to the primary circuit and a plurality of primary circuit calibrated coolant flow rates, the determination method further includes:

[0092] According to the structure of the primary loop, a primary loop model corresponding to the primary loop is constructed, wherein the input of the primary loop model is the primary loop calibrated coolant flow rate, and the output of the primary loop model is the primary loop pressure drop corresponding to the primary loop calibrated 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 may include the primary loop's main equipment and primary loop's main pipelines. The primary loop's main equipment may include but is not limited to the reactor core, pressurizer, and steam generator, etc. The model's inlet boundary may be set to the pipeline at the main pump outlet, and the model's outlet may be set to the pipeline at the main pump inlet.

[0094] In some embodiments, 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. 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 according to the primary loop calibration coolant flow rate.

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

[0096] In some embodiments, before obtaining a plurality of primary circuit calibrated coolant flow rates within a preset range of the primary circuit coolant flow rate, the method includes:

[0097] Obtain the maximum primary circuit coolant flow rate corresponding to the target nuclear power unit at the full power platform;

[0098] Obtain the minimum primary coolant flow rate corresponding to the target nuclear power unit at the zero power platform;

[0099] Based on the minimum primary-circuit coolant flow rate and the maximum primary-circuit coolant flow rate, a preset range of the primary-circuit 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 corresponding to the target nuclear power unit at the full power platform and the minimum primary coolant flow rate corresponding to the target nuclear power unit at the zero power platform are obtained respectively. The preset range of the primary coolant flow rate is determined based on the maximum primary coolant flow rate and the minimum primary coolant flow rate.

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

[0102] In some embodiments, after determining a third relationship curve between the bypass flow of the main pump and the calibrated coolant flow of the primary circuit according to the first relationship curve and the second relationship curve, the determination method further includes:

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

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

[0105] Specifically, after obtaining the third relationship curve between the bypass flow of the main pump and the calibrated coolant flow of the primary circuit, the coolant flow of the primary circuit corresponding to the bypass flow of the main pump can be determined in real time according to the third relationship curve. Substituting the main pump bypass flow detected in real time into the third relationship curve, the coolant flow of the primary circuit corresponding to the real-time bypass flow of the main pump can be determined.

[0106] In some embodiments, the main pump bypass includes a flow meter, a resistance element and a pipeline. The resistance element is arranged in the pipeline of the main pump bypass, and the flow meter is arranged 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 main pump bypass flow.

[0107] Specifically, see Figure 2 , is a schematic diagram of the structure of a circuit flow measurement system provided in an embodiment of the present application. The main pump bypass may include a flow meter and a resistance member. The flow meter may be used to collect the main pump bypass flow in the main pump bypass. The resistance member may be used to increase the pressure drop of the main pump bypass, thereby controlling the fluid flow rate in the main pump bypass within a preset range of the flow meter.

[0108] In some embodiments, the flow meter can be arranged downstream of the resistance element in the bypass pipeline of the main pump, that is, on the side close to the inlet of the main pump. According to the actual working fluid type, temperature, and pressure, different types of flow meters such as turbine flow meters, orifice flow meters, and Coriolis flow meters can be selected. At the same time, the layout position of the flow meter can also be determined according to the pressure requirements of the flow meter.

[0109] In some embodiments, the resistance member can be a bow-shaped baffle, arranged in the main pump bypass pipeline, to increase the pressure drop of the main pump bypass, thereby controlling the fluid flow rate in the main pump bypass within the preset range of the flow meter. For different types of nuclear reactors, the specific shape and number of the bow-shaped baffle can be adjusted according to actual needs, and holes can be opened when necessary. See Figure 3 , is a schematic diagram of the bow-shaped baffle resistance member provided in the embodiment of the present application. Figure 4 , is a schematic diagram of an open-hole bow-shaped baffle resistance member provided in an embodiment of the present application.

[0110] By setting up a flow meter and a resistance piece, real-time measurement of the coolant flow rate of the reactor primary circuit can be achieved without relying on the elbow structure, thereby ensuring the safe operation of the reactor and improving the accuracy of the measurement.

[0111] For easier understanding, see Figure 5 , is a flow chart of a method for measuring a circuit flow rate provided by a specific embodiment of the present application. Figure 5As shown, the determination method may include:

[0112] Step S501: The main pump bypass flow meter measures.

[0113] Step S502: Main pump speed and main pump bypass flow relationship curve A.

[0114] Step S503: Calibrate at different power platforms.

[0115] Step S504: Main pump speed and primary circuit flow relationship curve B.

[0116] Step S505: Main pump bypass flow rate and primary circuit flow rate relationship curve C.

[0117] Step S506: Real-time measurement of the bypass flow of the main pump.

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

[0119] In this specific embodiment, the specific implementation can refer to the above description and will not be repeated here.

[0120] See also Figure 6 , is a schematic diagram of the structure of a device for determining a primary circuit coolant flow rate provided in an embodiment of the present application. In a second aspect of an embodiment of the present application, a device 60 for determining a primary circuit coolant flow rate is provided. The device 60 includes:

[0121] The measuring module 61 is used to obtain the main pump bypass flow corresponding to the main pump speed condition through the main pump bypass measurement under multiple main pump speed conditions;

[0122] A fitting module 62, for fitting the main pump speed and the main pump bypass flow rate corresponding to a plurality of main pump speed conditions, to obtain a first relationship curve between the main pump speed and the main pump bypass flow rate;

[0123] A first determination module 63 is used to obtain a second relationship curve between the main pump speed and the primary circuit calibrated coolant flow rate by using a primary circuit model corresponding to the primary circuit and a plurality of primary circuit calibrated coolant flow rates;

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

[0125] The device 50 for determining the flow rate of a single-circuit coolant provided in the second aspect of the embodiment of the present application can implement each process implemented in the above-mentioned method embodiment and achieve the same beneficial effects. To avoid repetition, it will not be described again here.

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

[0127] See also Figure 8 , is a structural diagram of an electronic device provided in an embodiment of the present application. The third aspect of the embodiment of the present 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, and the processor 8100 can execute the machine executable instructions to implement the above-mentioned method for determining the flow rate of a single-loop coolant.

[0128] A fourth aspect of an embodiment of the present application provides a machine-readable storage medium, on which instructions are stored. When the instructions are executed by a processor, the processor implements the above-mentioned method for determining the flow rate of a single-circuit coolant.

[0129] In some implementations, the embodiments of the present application further provide a computer program product, including a computer program, which, when executed by a processor, implements the method for determining the flow rate of a coolant in a circuit according to the above implementation.

[0130] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0131] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1These computer program instructions can also be stored in a computer-readable memory that can guide a computer or other programmable data processing device to work in a specific way, so that the instructions stored in the computer-readable memory produce a product including an instruction device, which implements the functions specified in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 These computer program instructions can also be loaded onto a computer or other programmable data processing device, so that a series of operation steps are executed on the computer or other programmable device to produce a computer-implemented process, so that the instructions executed on the computer or other programmable device provide for implementing the process in the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified 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] The memory may include non-permanent memory in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. The memory is an example of a computer-readable medium.

[0134] Computer readable media include permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. 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 disk read-only memory (CD-ROM), digital versatile disk (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 temporary computer readable media (transitory media), such as modulated data signals and carrier waves.

[0135] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0136] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

[0137] In addition, various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A method for determining a primary circuit coolant flow rate, characterized in that: A circuit includes a main pump and a main pump bypass, and the determination method includes: The primary circuit is operated under a plurality of main pump speed conditions, and main pump bypass flow corresponding to the plurality of main pump speed conditions is obtained through the main pump bypass measurement; Fitting the main pump speeds and the main pump bypass flows corresponding to the plurality of main pump speed conditions to obtain a first relationship curve between the main pump speed and the main pump bypass flow; Using a primary circuit model corresponding to the primary circuit and a plurality of primary circuit calibrated coolant flow rates, a second relationship curve between the main pump speed and the primary circuit calibrated coolant flow rate is obtained; According to the first relationship curve and the second relationship curve, a third relationship curve between the main pump bypass flow and the first-circuit calibrated coolant flow is determined, and the third relationship curve is used to determine the first-circuit coolant flow corresponding to the main pump bypass flow according to the main pump bypass flow.

2. The determination method according to claim 1, characterized in that: The method of obtaining a second relationship curve between the main pump speed and the primary circuit calibrated coolant flow rate by using the primary circuit model corresponding to the primary circuit and a plurality of primary circuit calibrated coolant flow rates comprises: Acquiring the plurality of primary circuit calibrated coolant flow rates within a preset range of the primary circuit coolant flow rate; Inputting the plurality of primary circuit calibration coolant flow rates into a primary circuit model corresponding to the primary circuit respectively, and obtaining the primary circuit pressure drops corresponding to the plurality of primary circuit calibration coolant flow rates; Determine the main pump speed corresponding to each primary circuit calibrated coolant flow rate according to the primary circuit pressure drop corresponding to each primary circuit calibrated coolant flow rate; A second relationship curve between the main pump speed and the primary circuit calibrated coolant flow rate is determined based on the primary circuit calibrated coolant flow rate and the primary circuit calibrated coolant flow rate corresponding to the primary circuit calibrated coolant flow rate.

3. The determination method according to claim 2, characterized in that: Determining the main pump speed corresponding to each primary circuit calibrated coolant flow rate according to the primary circuit pressure drop corresponding to each primary circuit calibrated coolant flow rate includes: Obtaining a fourth relationship curve between the main pump speed and the lift of the main pump; Determining the head corresponding to the calibrated coolant flow rate of the first circuit according to the first circuit pressure drop corresponding to the calibrated coolant flow rate of the first circuit; Based on the fourth relationship curve, the main pump rotation speed corresponding to the calibrated coolant flow rate of each primary circuit 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 circuit calibrated coolant flow rate by using the primary circuit model corresponding to the primary circuit and a plurality of primary circuit calibrated 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 a first loop calibrated coolant flow rate, and the output of the first loop model is a first loop pressure drop corresponding to the first loop calibrated coolant flow rate.

5. The determination method according to claim 2, characterized in that: Before obtaining a plurality of primary circuit calibrated coolant flow rates within the preset range of the primary circuit coolant flow rate, the determination method further includes: Obtain the maximum primary circuit coolant flow rate corresponding to the target nuclear power unit at the full power platform; Obtaining a minimum primary coolant flow rate corresponding to the target nuclear power unit at a zero power platform; Based on the minimum primary-circuit coolant flow rate and the maximum primary-circuit coolant flow rate, a preset range of the primary-circuit coolant flow rate is determined.

6. The determination method according to claim 1, characterized in that: After determining the third relationship curve between the bypass flow of the main pump and the calibrated coolant flow of the primary circuit according to the first relationship curve and the second relationship curve, the determination method further includes: Get real-time main pump bypass flow; Based on the third relationship curve, the primary circuit 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 arranged in the pipeline of the main pump bypass, and the flow meter is arranged 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 main pump bypass flow.

8. A device for determining a flow rate of a primary coolant circuit, characterized in that: A circuit includes a main pump and a main pump bypass, and the determining device includes: A measuring module, used for operating the primary circuit under a plurality of main pump speed conditions, and obtaining the main pump bypass flow corresponding to the plurality of main pump speed conditions through the main pump bypass measurement; A fitting module, used for fitting the main pump speeds and the main pump bypass flow rates corresponding to the plurality of main pump speed conditions, respectively, to obtain a first relationship curve between the main pump speed and the main pump bypass flow rate; A first determination module is used to obtain a second relationship curve between the main pump speed and the primary circuit calibrated coolant flow rate by using a primary circuit model corresponding to the primary circuit and a plurality of primary circuit calibrated coolant flow rates; The second determination module is used to determine a third relationship curve between the main pump bypass flow and the first-circuit calibrated coolant flow based on the first relationship curve and the second relationship curve, and the third relationship curve is used to determine the first-circuit coolant flow corresponding to the main pump bypass flow based on the main pump bypass flow.

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

10. A machine-readable storage medium, characterized in that: The machine-readable storage medium stores instructions, and the instructions are used to enable a machine to execute the method for determining a primary-circuit coolant flow rate according to any one of claims 1 to 7.

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