Thermal performance evaluation method for heat exchanger of nuclear power plant, electronic equipment and medium

Abstract

The invention relates to the technical field of nuclear power plants, in particular to a thermal performance evaluation method of a nuclear power plant heat exchanger, electronic equipment and a medium. According to the thermal performance evaluation method of the nuclear power plant heat exchanger, the current heat exchange parameter of the nuclear power plant heat exchanger needs to be obtained firstly; environment correlation parameters and environment irrelevant parameters are extracted from the current heat exchange parameters; according to the environment correlation parameter and the environment irrelevant parameter, determining a thermal performance reference condition; analyzing the current heat exchange parameter to obtain the current fouling resistance corresponding to the heat exchanger of the nuclear power plant; and performing thermal performance evaluation on the current fouling thermal resistance based on the thermal performance reference condition to obtain thermal performance evaluation data. Therefore, the thermal performance of the heat exchanger of the nuclear power plant can be evaluated more accurately.

Description

Technical Field

[0001] The present application relates to the technical field of nuclear power plants, and in particular to a thermal performance evaluation method, electronic equipment and medium for a heat exchanger in a nuclear power plant. Background Art

[0002] The equipment cooling water heat exchanger of a nuclear power plant undertakes important operation and safety functions. During normal operation or accidents of the nuclear power plant, it is used to export the heat dissipation of the equipment to meet the operating conditions of the user equipment and ensure the safety of the nuclear power plant. If the equipment cooling water heat exchanger fails, such as dirt or blockage, the operation and safety functions it undertakes will not be realized, which will affect the economy and safety of the nuclear power plant. Therefore, it is necessary to evaluate the thermal performance of the operating equipment cooling water heat exchanger.

[0003] In related technologies, nuclear power plant operators need to collect heat exchange parameters on the cold and hot sides of the heat exchanger, such as flow rate, inlet and outlet temperatures, etc., calculate the actual heat transfer coefficient, and compare the actual heat transfer coefficient with the corresponding heat transfer coefficient under the design accident conditions to evaluate the thermal performance of the heat exchanger. However, this method does not take into account the changes in operating conditions in actual operation, such as seasonal changes in seawater temperature and flow rate, and possible fouling or blockage, so it has certain limitations. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a thermal performance evaluation method, electronic equipment and medium for a heat exchanger in a nuclear power plant, which can more accurately evaluate the thermal performance of the heat exchanger in a nuclear power plant.

[0005] A method for evaluating thermal performance of a nuclear power plant heat exchanger according to a first aspect of the present application includes:

[0006] Get the current heat exchange parameters of the heat exchanger in the nuclear power plant;

[0007] Extracting environment-related parameters and environment-independent parameters from the current heat exchange parameters; wherein the environment-related parameters are used to characterize the current heat exchange parameters of the nuclear power plant heat exchanger related to the environment in which it is located, and the environment-independent parameters are used to characterize the current heat exchange parameters of the nuclear power plant heat exchanger that are unrelated to the environment in which it is located;

[0008] Determining a thermal performance benchmark condition according to the environment-related parameters and the environment-independent parameters;

[0009] Analyzing the current heat exchange parameters to obtain the current fouling thermal resistance corresponding to the heat exchanger of the nuclear power plant;

[0010] A thermal performance evaluation is performed on the current fouling thermal resistance based on the thermal performance benchmark condition to obtain thermal performance evaluation data.

[0011] According to some embodiments of the present application, the environment-related parameters include the current cold side flow rate and the current cold side inlet temperature, and the environment-independent parameters include the operating condition hot side flow rate and the operating condition hot side outlet temperature;

[0012] Determining the thermal performance reference condition according to the environment-related parameter and the environment-independent parameter includes:

[0013] Determine the heat exchange area, hot side specific heat capacity, cold side specific heat capacity and operating condition required heat of the heat exchanger of the nuclear power plant;

[0014] Perform a benchmark calculation based on the heat exchange area, the hot side specific heat capacity, the cold side specific heat capacity, the operating condition heat requirement, the current cold side flow rate, the current cold side inlet temperature, the operating condition hot side flow rate and the operating condition hot side outlet temperature to obtain the thermal performance benchmark data;

[0015] The thermal performance benchmark conditions are determined according to the thermal performance benchmark data.

[0016] According to some embodiments of the present application, the benchmark calculation is performed based on the heat exchange area, the hot side specific heat capacity, the cold side specific heat capacity, the operating condition required heat, the current cold side flow rate, the current cold side inlet temperature, the operating condition hot side flow rate and the operating condition hot side outlet temperature to obtain the thermal performance benchmark data, including:

[0017] Generate a first analytical element according to the operating condition hot side flow, the hot side specific heat capacity, the current cold side flow and the cold side specific heat capacity;

[0018] Generating a second analytical element by subtracting the hot side outlet temperature of the working condition from the current cold side inlet temperature;

[0019] generating a third analytical element according to the required heat of the working condition, the first analytical element and the second analytical element;

[0020] generating a fourth analytical element based on the product of the heat exchange area and the first analytical element;

[0021] The thermal performance benchmark data is generated based on the third analytical element and the fourth analytical element.

[0022] According to some embodiments of the present application, determining the thermal performance benchmark condition according to the thermal performance benchmark data includes:

[0023] Determining a theoretical unscaled thermal resistance corresponding to a heat exchanger of the nuclear power plant;

[0024] Determining a thermal resistance benchmark threshold value according to the thermal performance benchmark data and the scale-free theoretical thermal resistance;

[0025] The thermal performance reference condition is set according to the thermal resistance reference threshold.

[0026] According to some embodiments of the present application, the determining the non-scaling theoretical thermal resistance corresponding to the heat exchanger of the nuclear power plant includes:

[0027] Obtaining exchanger design parameters and material property information of the nuclear power plant heat exchanger;

[0028] The non-scaling theoretical thermal resistance is calculated based on the exchanger design parameters and the material property information.

[0029] According to some embodiments of the present application, the thermal performance evaluation of the current fouling thermal resistance based on the thermal performance benchmark condition to obtain thermal performance evaluation data includes:

[0030] In response to the current fouling thermal resistance being greater than the thermal resistance reference threshold, determining that the current fouling thermal resistance meets the thermal performance reference condition, generating the performance qualification data, and determining the performance qualification data as the thermal performance evaluation data;

[0031] In response to the current fouling thermal resistance being less than or equal to the thermal resistance reference threshold, determining that the current fouling thermal resistance does not meet the thermal performance reference condition, generating the thermal performance fault data, and determining the performance fault data as the thermal performance evaluation data.

[0032] According to some embodiments of the present application, determining the thermal performance reference condition according to the environment-related parameter and the environment-independent parameter includes:

[0033] Setting a corresponding environment-related margin for the environment-related parameter;

[0034] The thermal performance reference condition is determined according to the environment-related parameter, the environment-related margin and the environment-independent parameter.

[0035] According to some embodiments of the present application, the current heat exchange parameter is analyzed to obtain the current fouling thermal resistance corresponding to the heat exchanger of the nuclear power plant, including:

[0036] Determining a non-scaling theoretical heat transfer coefficient corresponding to a heat exchanger of the nuclear power plant;

[0037] Determining a current heat transfer coefficient based on the current heat exchange parameter;

[0038] The current fouling thermal resistance corresponding to the heat exchanger of the nuclear power plant is obtained by calculation based on the current heat transfer coefficient and the non-fouling theoretical heat transfer coefficient.

[0039] According to some embodiments of the present application, the calculation based on the current heat transfer coefficient and the non-fouling theoretical heat transfer coefficient to obtain the current fouling thermal resistance corresponding to the heat exchanger of the nuclear power plant includes:

[0040] constructing a first thermal resistance calculation element according to the current heat transfer coefficient;

[0041] According to the non-scaling theoretical heat transfer coefficient, construct a second thermal resistance calculation element;

[0042] The first thermal resistance calculation element and the second thermal resistance calculation element are combined to perform calculation to obtain the current fouling thermal resistance.

[0043] According to some embodiments of the present application, constructing a first thermal resistance calculation element according to the current heat transfer coefficient includes:

[0044] The first inverse parameter corresponding to the current heat transfer coefficient is determined as the first thermal resistance calculation element.

[0045] According to some embodiments of the present application, constructing a second thermal resistance calculation element according to the non-scaling theoretical heat transfer coefficient includes:

[0046] The second inverse parameter corresponding to the non-scaling theoretical heat transfer coefficient is determined as the second thermal resistance calculation element.

[0047] According to some embodiments of the present application, the combining the first thermal resistance calculation element and the second thermal resistance calculation element to calculate and obtain the current fouling thermal resistance includes:

[0048] The first thermal resistance calculation element and the second thermal resistance calculation element are calculated by difference processing to obtain the current fouling thermal resistance.

[0049] According to some embodiments of the present application, the nuclear power plant heat exchanger includes heat transfer heat and heat exchange average temperature difference, and the current heat transfer coefficient is determined based on the current heat exchange parameter, including:

[0050] Determining the effective heat exchange area of ​​the heat exchanger of the nuclear power plant;

[0051] The heat transfer coefficient is calculated in real time based on the heat transfer heat, the heat exchange average temperature difference and the effective heat exchange area to obtain the current heat transfer coefficient.

[0052] In a second aspect, an embodiment of the present application provides an electronic device, comprising: a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, it implements a method for evaluating the thermal performance of a nuclear power plant heat exchanger as described in any one of the embodiments of the first aspect of the present application.

[0053] In a third aspect, an embodiment of the present application provides a computer-readable storage medium, wherein the storage medium stores a program, and the program is executed by a processor to implement a thermal performance evaluation method for a nuclear power plant heat exchanger as described in any one of the embodiments of the first aspect of the present application.

[0054] The thermal performance evaluation method, electronic device, and medium of a nuclear power plant heat exchanger according to the embodiment of the present application have at least the following beneficial effects:

[0055] According to the thermal performance evaluation method of the nuclear power plant heat exchanger of the embodiment of the present application, it is necessary to first obtain the current heat exchange parameters of the nuclear power plant heat exchanger; extract the environment-related parameters and the environment-independent parameters from the current heat exchange parameters; wherein the environment-related parameters are used to characterize the current heat exchange parameters of the nuclear power plant heat exchanger related to the environment in which it is located, and the environment-independent parameters are used to characterize the current heat exchange parameters of the nuclear power plant heat exchanger that are independent of the environment in which it is located; determine the thermal performance benchmark conditions according to the environment-related parameters and the environment-independent parameters; analyze the current heat exchange parameters to obtain the current fouling thermal resistance corresponding to the nuclear power plant heat exchanger; perform thermal performance evaluation on the current fouling thermal resistance based on the thermal performance benchmark conditions to obtain thermal performance evaluation data. In this way, the thermal performance of the nuclear power plant heat exchanger can be evaluated more accurately.

[0056] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0058] Figure 1 A schematic flow chart of a method for evaluating thermal performance of a heat exchanger in a nuclear power plant provided in an embodiment of the present application;

[0059] Figure 2 Another schematic diagram of a process flow of a thermal performance evaluation method for a heat exchanger in a nuclear power plant provided in an embodiment of the present application;

[0060] Figure 3 Another schematic diagram of a process flow of a thermal performance evaluation method for a heat exchanger in a nuclear power plant provided in an embodiment of the present application;

[0061] Figure 4 Another schematic diagram of a process flow of a thermal performance evaluation method for a heat exchanger in a nuclear power plant provided in an embodiment of the present application;

[0062] Figure 5 Another schematic diagram of a process flow of a thermal performance evaluation method for a heat exchanger in a nuclear power plant provided in an embodiment of the present application;

[0063] Figure 6 Another schematic diagram of a process flow of a thermal performance evaluation method for a heat exchanger in a nuclear power plant provided in an embodiment of the present application;

[0064] Figure 7 Another schematic diagram of a process flow of a thermal performance evaluation method for a heat exchanger in a nuclear power plant provided in an embodiment of the present application;

[0065] Figure 8 Another schematic diagram of a process flow of a thermal performance evaluation method for a heat exchanger in a nuclear power plant provided in an embodiment of the present application;

[0066] Fig. 9 It is a schematic diagram of the hardware structure of the electronic device provided in the embodiment of the present application. DETAILED DESCRIPTION

[0067] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0068] In the description of this application, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed", etc. are understood to exclude the number itself, and "above", "below", "within", etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0069] In the description of the present application, it should be understood that descriptions involving orientation, such as up, down, left, right, front, back, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0070] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0071] In the description of this application, it should be noted that, unless otherwise clearly defined, the terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application in combination with the specific content of the technical solution. In addition, the identification of specific steps below does not represent a limitation on the order of steps and execution logic. The execution order and execution logic between each step should be understood and inferred with reference to the contents described in the embodiment.

[0072] The equipment cooling water heat exchanger of a nuclear power plant plays an important operational and safety role. It is used to dissipate the heat of the equipment to meet the operating conditions of the user's equipment and ensure the safety of the nuclear power plant during normal operation or accidents. It should be pointed out that as a passive device, the aging, deformation, corrosion and scaling of the internal components of the heat exchanger can lead to equipment failure, resulting in unplanned shutdown of the heat exchange system, causing huge safety problems and economic losses.

[0073] There are many users on the hot side of the equipment cooling water heat exchanger in nuclear power plants, and the operation of the users varies with the operating conditions of the nuclear power plants. Therefore, the flow rate and inlet temperature of the hot side of the heat exchanger vary with the operating conditions of the nuclear power plants. At the same time, the flow rate on the cold side of the equipment cooling water heat exchanger in nuclear power plants varies with the seawater tide level, and the seawater temperature on the cold side of the heat exchanger also varies with the seasons.

[0074] If the equipment cooling water heat exchanger fails, such as due to dirt or blockage, it will not be able to perform its operation and safety functions, thus affecting the economy and safety of the nuclear power plant. Therefore, it is necessary to evaluate the thermal performance of the equipment cooling water heat exchanger in operation.

[0075] In related technologies, nuclear power plant operators need to collect heat exchange parameters on the cold and hot sides of the heat exchanger, such as flow rate, inlet and outlet temperatures, etc., calculate the actual heat transfer coefficient, and compare the actual heat transfer coefficient with the corresponding heat transfer coefficient under the design accident conditions to evaluate the thermal performance of the heat exchanger. However, this method does not take into account the changes in operating conditions in actual operation, such as seasonal changes in seawater temperature and flow rate, and possible fouling or blockage, so it has certain limitations.

[0076] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a thermal performance evaluation method, electronic equipment and medium for a heat exchanger in a nuclear power plant, which can more accurately evaluate the thermal performance of the heat exchanger in a nuclear power plant.

[0077] Please refer to the accompanying drawings for further explanation.

[0078] Reference Figure 1 According to an embodiment of the present application, a method for evaluating thermal performance of a heat exchanger in a nuclear power plant includes:

[0079] Step S101, obtaining current heat exchange parameters of a heat exchanger in a nuclear power plant;

[0080] Step S102, extracting environment-related parameters and environment-independent parameters from the current heat exchange parameters; wherein the environment-related parameters are used to characterize the current heat exchange parameters of the nuclear power plant heat exchanger related to the environment in which it is located, and the environment-independent parameters are used to characterize the current heat exchange parameters of the nuclear power plant heat exchanger that are unrelated to the environment in which it is located;

[0081] Step S103, determining the thermal performance reference conditions according to the environment-related parameters and the environment-independent parameters;

[0082] Step S104, analyzing the current heat exchange parameters to obtain the current fouling thermal resistance corresponding to the heat exchanger of the nuclear power plant;

[0083] Step S105 , performing a thermal performance evaluation on the current fouling thermal resistance based on the thermal performance benchmark condition to obtain thermal performance evaluation data.

[0084] In response to the technical problems encountered in the actual operation of nuclear power plant equipment cooling water heat exchangers, the thermal performance evaluation method proposed in this application adopts a more detailed and dynamic evaluation strategy. First, the embodiment of the present application obtains the current heat exchange parameters of the nuclear power plant heat exchanger, including key parameters such as flow rate, inlet and outlet temperature, to provide basic data for evaluation. Then, these parameters are further subdivided into environment-related parameters and environment-independent parameters. Environment-related parameters, such as seawater temperature and flow rate, are directly affected by seasonal changes, while environment-independent parameters are not affected by these external environmental changes.

[0085] This distinction can more accurately reflect the performance of the heat exchanger under the current actual operating conditions. Next, the embodiment of the present application uses these parameters to determine the benchmark conditions for thermal performance, which is equivalent to setting a reasonable expected value for the performance of the heat exchanger, which takes into account the influence of environmental factors. Subsequently, by analyzing the current heat exchange parameters, the embodiment of the present application can calculate the current fouling thermal resistance of the heat exchanger, which is a key indicator for evaluating the performance of the heat exchanger because it is directly related to the heat transfer efficiency of the heat exchanger.

[0086] Finally, based on the determined thermal performance benchmark conditions, the thermal performance of the current fouling thermal resistance is evaluated to obtain thermal performance evaluation data. This step is crucial because it not only provides a quantitative evaluation of the current performance of the heat exchanger, but also reveals whether the heat exchanger needs to be cleaned or repaired. In this way, nuclear power plant operation and maintenance personnel can more accurately judge the performance status of the heat exchanger and take timely measures to avoid operational and safety risks caused by problems such as fouling or blockage, thereby ensuring the economy and safety of the nuclear power plant. The implementation of this evaluation method makes the thermal performance evaluation of the heat exchanger more scientific and reasonable, and can adapt to the ever-changing operating environment, improving the accuracy and practicality of the evaluation.

[0087] In some embodiments, step S101 is to obtain current heat exchange parameters of a heat exchanger in a nuclear power plant.

[0088] It should be noted that in the thermal performance evaluation process of the heat exchanger in a nuclear power plant, it is crucial to obtain the current heat exchange parameters, because it provides basic data for subsequent performance analysis. The current heat exchange parameters include a series of parameters directly related to the operating status of the heat exchanger, and these current heat exchange parameters can reflect the working status of the heat exchanger at a specific moment. In some embodiments, the current heat exchange parameters may specifically include the following types:

[0089] The inlet and outlet temperatures of the heat exchanger, which include the inlet and outlet temperatures of the hot side and the cold side. These temperature data are key to calculating the heat transfer coefficient and heat load because they are directly related to the heat transfer efficiency of the heat exchanger. Temperature measurement is usually achieved by sensors installed at the inlet and outlet of the heat exchanger. These sensors can provide real-time temperature readings.

[0090] The flow rate of the heat exchanger, the flow rate measurement is also an important part of obtaining the current heat exchange parameters. The flow rate reflects the speed of the fluid passing through the heat exchanger, which is also important for evaluating the thermal performance of the heat exchanger. The flow rate can be measured by various types of flow meters, such as electromagnetic flow meters, vortex flow meters, etc. These flow meters can provide accurate flow data.

[0091] In addition to temperature and flow, current heat exchange parameters can also include other factors that may affect the performance of the heat exchanger, such as fluid pressure, chemical composition, etc. Although these parameters are not direct heat exchange parameters, they may indirectly affect the operating status of the heat exchanger, so in some cases they also need to be measured and recorded.

[0092] In step S102 of some embodiments, environment-related parameters and environment-independent parameters are extracted from current heat exchange parameters; wherein the environment-related parameters are used to characterize the current heat exchange parameters of the nuclear power plant heat exchanger related to the environment in which it is located, and the environment-independent parameters are used to characterize the current heat exchange parameters of the nuclear power plant heat exchanger that are unrelated to the environment in which it is located.

[0093] It should be noted that in the thermal performance evaluation of nuclear power plant heat exchangers, environment-related parameters and environment-independent parameters are extracted from the current heat exchange parameters. The purpose is to distinguish the different factors that affect the performance of the heat exchanger, so as to more accurately evaluate its performance and formulate corresponding maintenance strategies.

[0094] Environmentally related parameters are those parameters that are directly affected by external environmental conditions. In the heat exchangers of nuclear power plants, such environmentally related parameters may include the inlet temperature and flow rate of seawater. For example, the temperature of seawater will change with the seasons and weather, thus affecting the heat transfer efficiency of the heat exchanger. Similarly, the flow rate of seawater may fluctuate due to changes in natural conditions such as tides, wind and waves, thus affecting the cooling effect of the heat exchanger. Therefore, extracting these environmentally related parameters separately helps to distinguish and quantify the specific impact of current environmental conditions on the performance of the heat exchanger.

[0095] Environmentally independent parameters refer to those parameters that are not directly affected by external environmental conditions. These environmentally independent parameters reflect more of the performance characteristics of the heat exchanger itself, such as the material properties, structural design, fouling thermal resistance, etc. of the heat exchanger. For example, the fouling thermal resistance of the heat exchanger is caused by internal dirt accumulation, which has little to do with external environmental conditions, but has a significant impact on the heat transfer efficiency of the heat exchanger. By analyzing environmentally independent parameters, it is possible to distinguish whether the performance of the quantitative heat exchanger itself meets the design requirements and whether there are areas that need improvement.

[0096] In step S103 of some embodiments, a thermal performance reference condition is determined based on environment-related parameters and environment-independent parameters.

[0097] In the thermal performance evaluation process of nuclear power plant heat exchangers, determining the thermal performance benchmark conditions involves taking into account both environmentally relevant and environmentally unrelated parameters to establish a benchmark that reflects the performance of the heat exchanger under specific conditions. Environmentally relevant parameters, such as seawater temperature and flow, are directly affected by external environmental conditions, while environmentally unrelated parameters are more related to the design and status of the heat exchanger itself.

[0098] First, environmental parameters provide information about the operation of the heat exchanger under different environmental conditions. For example, seasonal changes in seawater temperature can affect the heat load and heat transfer efficiency of the heat exchanger. By analyzing these parameters, the expected performance of the heat exchanger under different environmental conditions can be determined. This helps to evaluate whether the heat exchanger can adapt to environmental changes and whether additional measures need to be taken to ensure its performance.

[0099] Secondly, environment-independent parameters provide important information about the performance of the heat exchanger itself. These parameters include the material, structure, fouling thermal resistance, etc. of the heat exchanger, which are not affected by external environmental conditions but have a direct impact on the thermal performance of the heat exchanger. By analyzing these parameters, it is possible to evaluate whether the design and maintenance of the heat exchanger meet the requirements of long-term operation.

[0100] When determining the benchmark conditions for thermal performance, it is necessary to combine these two types of parameters. For example, a comprehensive evaluation model can be established that takes into account the impact of environmental changes and the characteristics of the heat exchanger itself on performance. For another example, historical data and simulation analysis can be used to determine the optimal performance of a heat exchanger under specific environmental conditions. This optimal performance can be used as a benchmark condition for thermal performance to evaluate the performance of the heat exchanger in actual operation.

[0101] Reference Figure 2 According to some embodiments of the present application, the environment-related parameters include the current cold side flow rate and the current cold side inlet temperature, and the environment-independent parameters include the operating hot side flow rate and the operating hot side outlet temperature. Step S103 determines the thermal performance benchmark conditions according to the environment-related parameters and the environment-independent parameters, including:

[0102] Step S201, determining the heat exchange area, hot side specific heat capacity, cold side specific heat capacity and operating condition required heat of the heat exchanger of the nuclear power plant;

[0103] Step S202, performing a benchmark calculation based on the heat exchange area, the hot side specific heat capacity, the cold side specific heat capacity, the operating condition required heat, the current cold side flow rate, the current cold side inlet temperature, the operating condition hot side flow rate and the operating condition hot side outlet temperature to obtain thermal performance benchmark data;

[0104] Step S203, determining the thermal performance benchmark conditions according to the thermal performance benchmark data.

[0105] In some embodiments of the present application, when evaluating the thermal performance of a nuclear power plant heat exchanger, it is crucial to distinguish between environment-related parameters and environment-independent parameters. Environment-related parameters include the current cold side flow rate and the current cold side inlet temperature, which are closely related to the environmental conditions in which the heat exchanger is located. For example, the cold side inlet temperature may be affected by the seawater temperature, while the cold side flow rate may be related to the flow of seawater or the working state of the pump. Changes in these parameters directly reflect the impact of external environmental conditions on the performance of the heat exchanger. Relatively speaking, environment-independent parameters, such as the hot side flow rate and the hot side outlet temperature, are more related to the operating state inside the heat exchanger, and they are not directly affected by external environmental conditions. The hot side flow rate and outlet temperature can provide important information about the heat transfer efficiency and heat load inside the heat exchanger.

[0106] In step S201 of some embodiments, the first step is to determine the thermal performance benchmark conditions. This includes determining the effective heat exchange area, hot side specific heat capacity, cold side specific heat capacity and operating condition required heat of the nuclear power plant heat exchanger. The heat exchange area is a key parameter in the design of the heat exchanger, which determines the maximum heat transfer potential of the heat exchanger. The specific heat capacity of the hot side and the cold side are physical properties of the fluid, which affect the heat transfer efficiency. The operating condition required heat reflects the heat load demand of the nuclear power plant for the heat exchanger under specific operating conditions.

[0107] In step S202 of some embodiments, a benchmark calculation is performed using these benchmark conditions and the current heat exchange parameters. This calculation process involves complex thermodynamic and fluid dynamic models to ensure the accuracy of the evaluation. By combining the heat exchange area, specific heat capacity, operating condition heat demand, and actual flow and temperature data, thermal performance benchmark data can be calculated. These data may include key parameters such as benchmark heat transfer coefficient and benchmark fouling thermal resistance, which are the basis for evaluating the performance of the heat exchanger.

[0108] Reference Figure 3 According to some embodiments of the present application, step S202 performs a benchmark calculation based on the heat exchange area, the hot side specific heat capacity, the cold side specific heat capacity, the operating condition required heat, the current cold side flow rate, the current cold side inlet temperature, the operating condition hot side flow rate and the operating condition hot side outlet temperature to obtain thermal performance benchmark data, including:

[0109] Step S301, generating a first analytical element according to the hot side flow rate, hot side specific heat capacity, current cold side flow rate and cold side specific heat capacity of the working condition;

[0110] Step S302, generating a second analytical element by subtracting the hot side outlet temperature from the current cold side inlet temperature according to the working condition;

[0111] Step S303, generating a third analytical element according to the required heat of the working condition, the first analytical element and the second analytical element;

[0112] Step S304, generating a fourth analytical element based on the product of the heat exchange area and the first analytical element;

[0113] Step S305: Generate thermal performance benchmark data based on the third analytical element and the fourth analytical element.

[0114] In some embodiments, the heat exchange area is represented by S, and the hot side specific heat capacity is represented by CP h , the cold side specific heat capacity is expressed as CP c , the heat demand of the working condition is expressed as POW IAC , the current cold side flow is expressed as Q C , the current cold side inlet temperature is represented by T i c. The hot side flow rate under working condition is expressed as Q h_IAC , the hot side outlet temperature under working condition is expressed as T o h IAC .

[0115] Based on this, step S301 is based on the hot side flow Q h_IAC 、Hot side specific heat capacity CP h 、Current cold side flow Q c 、Cold side specific heat capacity CP c , generate the first parsed element. The first parsed element can be expressed as:

[0116]

[0117] It should be noted that the first analytical element integrates the heat capacity of the fluid on both sides of the heat exchanger, which reflects the ability of the fluid to carry heat under certain flow and specific heat conditions. The first analytical element is related to the heat transfer potential of the heat exchanger.

[0118] Further, step S302 is based on the hot side outlet temperature T o h IAC and the current cold side inlet temperature T i c is subtracted to generate the second analytical element, which can be expressed as:

[0119] T o h IAC -T i c

[0120] It is important to note that the second analytical element is one of the key factors in measuring the efficiency of a heat exchanger because it represents the temperature driving force achieved by the heat exchanger in actual operation. The larger this temperature difference, the higher the potential heat transfer capacity of the heat exchanger.

[0121] Furthermore, step S303 requires heat POW according to the working condition. IAC , the first parsed element and the second parsed element T o h IAC -T i c, generates the third parsed element, which can be expressed as:

[0122]

[0123] It should be noted that the third analytical element combines the design requirements of the heat exchanger (such as the required heat of the operating condition) with the actual operating conditions (such as the heat capacity and temperature difference of the fluid) to facilitate the evaluation of whether the heat exchanger can meet the specific heat load requirements.

[0124] Furthermore, step S304 is based on the heat exchange area S and the first analytical element The product of generates the fourth analytical element, which can be expressed as:

[0125]

[0126] It should be noted that the heat transfer area is combined with the heat capacity of the fluid during the heat exchange process to form a fourth analytical element, which can provide a more comprehensive perspective on the heat transfer potential of the heat exchanger.

[0127] Finally, thermal performance benchmark data is generated based on the third analytical element and the fourth analytical element.

[0128] It should be pointed out that by combining the third analytical element as the denominator and the fourth analytical element as the numerator, the maximum allowable thermal resistance Ra of the heat exchanger can be obtained as the benchmark data of thermal performance. IAC The analytical expression of is:

[0129]

[0130] In step S203 of some embodiments, a benchmark condition of thermal performance is determined based on the data obtained from the benchmark calculation. These benchmark conditions provide a scientific and reasonable reference standard for the performance evaluation of the heat exchanger. By comparing the actual operating data with these benchmark conditions, it is possible to accurately evaluate whether the performance of the heat exchanger meets the design requirements and whether there is a risk of performance degradation.

[0131] Reference Figure 4 According to some embodiments of the present application, step S203 determines the thermal performance benchmark conditions according to the thermal performance benchmark data, including:

[0132] Step S401, determining the non-scaling theoretical thermal resistance corresponding to the heat exchanger of the nuclear power plant;

[0133] Step S402, determining a thermal resistance reference threshold value according to thermal performance reference data and non-scaling theoretical thermal resistance;

[0134] Step S403, setting a thermal performance reference condition according to the thermal resistance reference threshold.

[0135] In step S401 of some embodiments, the non-scaling theoretical thermal resistance corresponding to the heat exchanger of the nuclear power plant is determined. The non-scaling theoretical thermal resistance is expressed as It should be noted that the scale-free theoretical thermal resistance refers to the thermal resistance of the heat exchanger under ideal conditions, that is, when there is no dirt or other deposits on the surface of the heat exchanger. This value is usually calculated based on the design parameters and material properties of the heat exchanger, and it represents the heat transfer efficiency of the heat exchanger under the best clean state.

[0136] According to some embodiments of the present application, determining a non-scaling theoretical thermal resistance corresponding to a heat exchanger of a nuclear power plant includes:

[0137] Obtain exchanger design parameters and material properties information for heat exchangers in nuclear power plants;

[0138] Based on the exchanger design parameters and material property information, the non-scaling theoretical thermal resistance is calculated.

[0139] Determining the non-scaling theoretical thermal resistance is a critical step in the performance evaluation of heat exchangers in nuclear power plants, as it provides a benchmark for the heat transfer efficiency of heat exchangers under ideal conditions. This process involves two main steps: first, obtaining information on the design parameters and material properties of heat exchangers in nuclear power plants; second, calculating the non-scaling theoretical thermal resistance based on this information.

[0140] Obtaining information on exchanger design parameters and material properties is the basis for determining the non-scaling theoretical thermal resistance. This information usually includes the type of heat exchanger (such as shell and tube, plate, etc.), size (such as tube diameter, tube length, tube spacing, etc.), material (such as stainless steel, copper alloy, etc.) and manufacturing specifications. These parameters are crucial to understanding the heat transfer performance of the heat exchanger because they directly affect the heat transfer area, heat transfer coefficient and fluid dynamics characteristics of the heat exchanger.

[0141] Once the necessary design parameters and material properties information have been gathered, the unscaled theoretical thermal resistance can be calculated. This calculation is based on basic theories of heat transfer, such as Fourier's laws and Newton's laws of cooling, as well as the specific design of the heat exchanger.

[0142] In step S402 of some embodiments, a thermal resistance benchmark threshold is determined based on the thermal performance benchmark data and the scale-free theoretical thermal resistance. It should be noted that the thermal resistance benchmark threshold is an important reference for evaluating whether the performance of the heat exchanger meets the standard. It takes into account various conditions that the heat exchanger may encounter in actual operation, such as the temperature and flow rate of the fluid, the cleanliness of the heat exchanger, etc. By setting this threshold, it can be ensured that the performance evaluation of the heat exchanger is both scientific and practical.

[0143] If the above heat exchanger allows a maximum thermal resistance Ra IAC As the thermal performance benchmark data, the thermal resistance benchmark threshold RE a , which can be expressed as:

[0144]

[0145] In step S403 of some embodiments, a thermal performance reference condition is set according to a thermal resistance reference threshold. It should be noted that the thermal resistance reference threshold is used as a key indicator for evaluating the performance of the heat exchanger to determine whether the heat exchanger meets the operating requirements of the nuclear power plant. If the actual thermal resistance of the heat exchanger exceeds this threshold, it may mean that the heat exchanger needs to be cleaned or maintained to restore its heat transfer efficiency. On the contrary, if the thermal resistance is lower than the threshold, it indicates that the performance of the heat exchanger is good and can continue to operate normally.

[0146] The embodiment of the present application shown by steps S201 to S203 can provide a comprehensive and accurate evaluation of the thermal performance of the heat exchanger of a nuclear power plant. This not only helps to ensure the efficient operation of the heat exchanger, but also helps to timely identify and solve possible performance problems, thereby ensuring the overall safety and reliability of the nuclear power plant.

[0147] Reference Figure 5 According to some embodiments of the present application, step S103 determines the thermal performance reference condition according to the environment-related parameters and the environment-independent parameters, including:

[0148] Step S501, setting a corresponding environment-related margin for an environment-related parameter;

[0149] Step S502, determining the thermal performance reference conditions according to the environment-related parameters, the environment-related margins and the environment-independent parameters.

[0150] In step S501 of some embodiments, a corresponding environment-related margin is set for the environment-related parameter. The environment-related margin is a preventive measure that takes into account possible fluctuations in external environmental conditions, such as seasonal changes in seawater temperature or fluctuations in flow. By setting the margin, it can be ensured that even if the environmental conditions deviate from expectations, the heat exchanger can still meet its design requirements, thereby ensuring the stable operation of the nuclear power plant.

[0151] In some embodiments, the setting of the environment-related margin can be based on historical data, environmental prediction models, or empirical judgment. For example, if historical data shows that seawater temperature may increase significantly in a particular season, a higher margin can be set for the cold side inlet temperature to ensure that the heat exchanger can still work effectively under high temperature conditions. Similarly, if the flow rate may be reduced due to pump maintenance or failure, a margin can also be set for the cold side flow rate to cope with the reduced flow rate.

[0152] In step S502 of some embodiments, a thermal performance benchmark condition is determined based on environment-related parameters, environment-related margins, and environment-independent parameters. This step combines the actual values ​​of the environment-related parameters, the margins set for these parameters, and the environment-independent parameters to determine the performance benchmark of the heat exchanger under specific operating conditions. This benchmark condition reflects the performance level that the heat exchanger should achieve after considering all relevant factors. For example, if the environment-related parameters show that the current cold side inlet temperature is low, and the environment-independent parameters show that the hot side flow is normal, then the thermal performance benchmark condition can be adjusted to reflect the performance of the heat exchanger under this specific operating condition. In this way, it can be ensured that the performance evaluation of the heat exchanger takes into account both the impact of the external environment and the operating status of the heat exchanger itself.

[0153] The embodiment of the present application shown by step S501 to step S502 can provide a comprehensive performance evaluation framework for the heat exchanger by setting the environment-related margin and combining the environment-independent parameters to determine the thermal performance benchmark conditions. This method helps to identify and deal with various factors that may affect the performance of the heat exchanger, thereby ensuring that the heat exchange system of the nuclear power plant can maintain efficient and reliable operation under various environmental conditions.

[0154] In some more specific embodiments, in the above process, the maximum thermal resistance Ra of the heat exchanger as the thermal performance benchmark data is allowed IAC The analytical expression of can be expressed as:

[0155]

[0156] If the current cold side inlet temperature is expressed as T i c IAC Consider a margin of 4°C. The maximum allowable thermal resistance Ra of the heat exchanger, which is the benchmark data for thermal performance, is IAC The analytical expression of can be expressed as:

[0157]

[0158] In this way, the thermal performance benchmark data can cope with the fluctuation of seawater temperature within a certain range and has a certain degree of conservatism. The thermal performance benchmark data calculated according to the current meteorological conditions can reflect the actual thermal performance requirements of the current heat exchanger, and can be used to guide operation and maintenance work, reduce unnecessary maintenance operations, and then more reasonably formulate operation and maintenance strategies to improve production efficiency.

[0159] In step S104 of some embodiments, current heat exchange parameters are analyzed to obtain current fouling thermal resistance corresponding to the heat exchanger of the nuclear power plant.

[0160] In the thermal performance evaluation of the heat exchanger in a nuclear power plant, step S104 is to analyze the current heat exchange parameters to obtain the current fouling thermal resistance corresponding to the heat exchanger. Fouling thermal resistance refers to the additional resistance to heat transfer caused by the fouling layer accumulated on the heat transfer surface of the heat exchanger, which is one of the important factors affecting the efficiency and performance of the heat exchanger.

[0161] Reference Figure 6 According to some embodiments of the present application, step S104 analyzes the current heat exchange parameters to obtain the current fouling thermal resistance corresponding to the heat exchanger of the nuclear power plant, including:

[0162] Step S601, determining a non-scaling theoretical heat transfer coefficient corresponding to a heat exchanger of a nuclear power plant;

[0163] Step S602, determining the current heat transfer coefficient based on the current heat exchange parameters;

[0164] Step S603, calculating according to the current heat transfer coefficient and the non-fouling theoretical heat transfer coefficient to obtain the current fouling thermal resistance corresponding to the heat exchanger of the nuclear power plant.

[0165] In step S601 of some embodiments, it is necessary to determine the non-scaling theoretical heat transfer coefficient corresponding to the heat exchanger of the nuclear power plant. The non-scaling theoretical heat transfer coefficient refers to the theoretical heat transfer coefficient of the heat exchanger under the assumption that the surface of the heat exchanger is completely clean and not affected by dirt. This value can be calculated based on the design parameters and material properties of the heat exchanger, providing a benchmark for performance comparison.

[0166] In step S602 of some embodiments, the current heat transfer coefficient is determined based on the current heat exchange parameters, such as the flow rate of the fluid, the inlet and outlet temperatures, etc. The heat transfer coefficient is a key parameter for measuring the heat transfer efficiency of the heat exchanger, which can be calculated through the actual measured heat exchanger performance data. This coefficient reflects the actual heat transfer capacity of the heat exchanger under the current operating conditions.

[0167] Reference Figure 7 According to some embodiments of the present application, the heat exchanger of the nuclear power plant includes heat transfer heat and heat transfer average temperature difference. Step S602 determines the current heat transfer coefficient based on the current heat exchange parameter, including:

[0168] Step S701, determining the effective heat exchange area of ​​the heat exchanger of the nuclear power plant;

[0169] Step S702, based on the heat transfer heat, the average temperature difference of heat exchange and the effective heat exchange area, the heat transfer coefficient is calculated in real time to obtain the current heat transfer coefficient.

[0170] In some embodiments, in order to obtain the current fouling thermal resistance, it is first necessary to collect and analyze the current heat exchange parameters, which may include the inlet and outlet temperatures of the heat exchanger, the flow rate of the fluid, the specific heat capacity of the fluid, etc. These current heat exchange parameters can be obtained by real-time monitoring by sensors installed on the heat exchanger. Then, these current heat exchange parameters are used to calculate the current heat transfer coefficient of the heat exchanger. Specifically, the current heat transfer coefficient is a key parameter for measuring the heat transfer efficiency of the heat exchanger, which can be calculated by the following formula:

[0171]

[0172] Where U is the heat transfer coefficient, Q is the amount of heat transferred through the heat exchanger, A is the effective heat transfer area of ​​the heat exchanger, and ΔT lm is the log mean temperature difference.

[0173] It should be noted that the heat exchange area S and the effective heat exchange area A are related but may not be exactly the same concepts.

[0174] The heat transfer area, S, refers to the total heat transfer area of ​​the heat exchanger, including all surfaces designed to transfer heat. This includes the surface area inside the pipe, the surface area outside the pipe, or the plate area in a plate heat exchanger. Ideally, this area is calculated by the manufacturer based on the design parameters of the heat exchanger, and it represents the maximum possible heat transfer capacity of the heat exchanger.

[0175] The effective heat exchange area A refers to the area that actually participates in heat exchange. In some cases, due to the influence of dirt, corrosion, scaling or other operating conditions, a part of the heat exchanger area may not be able to effectively transfer heat. Therefore, the effective heat exchange area refers to the area that can effectively exchange heat under actual operating conditions.

[0176] Ideally, if the heat exchanger is brand new and free of any dirt or obstructions, the heat transfer area S is equal to the effective heat transfer area A. However, in actual applications, due to the influence of dirt and other factors, the effective heat transfer area A may be smaller than the total heat transfer area S.

[0177] In step S603 of some embodiments, a current fouling thermal resistance corresponding to the heat exchanger of the nuclear power plant is calculated based on the current heat transfer coefficient and the theoretical non-fouling thermal resistance. This calculation process may include comparing the actually observed heat transfer coefficient with the heat transfer coefficient under the theoretical non-fouling state. Through this comparison, the actual impact of fouling on the heat transfer efficiency of the heat exchanger can be evaluated. The calculated current fouling thermal resistance provides a quantitative indicator for evaluating the cleanliness of the heat exchanger and the degree of performance degradation.

[0178] Next, it is necessary to determine the theoretical heat transfer coefficient of the heat exchanger in a non-fouling state. The theoretical heat transfer coefficient can be determined based on the design parameters of the heat exchanger and the performance data in a clean state. With the theoretical heat transfer coefficient and the current heat transfer coefficient, the current fouling thermal resistance can be calculated.

[0179] Specifically, the current fouling thermal resistance can be estimated by the following formula:

[0180]

[0181] Among them, R f Indicates the current fouling thermal resistance, U theoretical is the theoretical heat transfer coefficient without fouling, U actual is the current heat transfer coefficient.

[0182] According to some embodiments of the present application, the current fouling thermal resistance corresponding to the heat exchanger of the nuclear power plant is obtained by calculation based on the current heat transfer coefficient and the non-fouling theoretical heat transfer coefficient, including:

[0183] According to the current heat transfer coefficient, construct the first thermal resistance calculation element;

[0184] According to the heat transfer coefficient of the non-scaling theory, the second thermal resistance calculation element is constructed;

[0185] The first thermal resistance calculation element and the second thermal resistance calculation element are combined to perform calculation to obtain the current fouling thermal resistance.

[0186] According to some embodiments of the present application, constructing a first thermal resistance calculation element according to the current heat transfer coefficient includes:

[0187] The first inverse parameter corresponding to the current heat transfer coefficient, that is, Determined as the first thermal resistance calculation element.

[0188] According to some embodiments of the present application, a second thermal resistance calculation element is constructed based on the non-scaling theoretical heat transfer coefficient, including:

[0189] The second inverse parameter corresponding to the non-scaling theoretical heat transfer coefficient, that is, Determined as the second thermal resistance calculation element.

[0190] According to some embodiments of the present application, the first thermal resistance calculation element and the second thermal resistance calculation element are combined to perform calculation to obtain the current fouling thermal resistance, including:

[0191] The first thermal resistance calculation element and the second thermal resistance calculation element are calculated by difference processing, that is, Get the current dirt thermal resistance R f .

[0192] In some more specific embodiments, other factors may be considered during the calculation process, such as changes in the physical properties of the fluid, aging and corrosion of the heat exchanger, etc. These factors may affect the performance of the heat exchanger and the accurate evaluation of the fouling thermal resistance.

[0193] It should be understood that through the above analysis and calculation, the current fouling thermal resistance corresponding to the nuclear power plant heat exchanger can be obtained. This value is an important basis for evaluating the performance of the heat exchanger and formulating maintenance strategies. For example, if the fouling thermal resistance exceeds the preset threshold, it may mean that the heat exchanger needs to be cleaned or repaired to restore its heat transfer efficiency and ensure the safe and economic operation of the nuclear power plant. By conducting such analysis regularly, problems with the heat exchanger can be discovered and dealt with in a timely manner to avoid performance degradation and potential safety risks caused by fouling accumulation.

[0194] Through the embodiment of the present application shown in step S601 to step S603, the performance status of the heat exchanger under the current operating conditions can be accurately evaluated to determine the impact of fouling on the performance of the heat exchanger.

[0195] In step S105 of some embodiments, a thermal performance evaluation is performed on the current fouling thermal resistance based on a thermal performance benchmark condition to obtain thermal performance evaluation data.

[0196] In the thermal performance evaluation process of the heat exchanger in a nuclear power plant, step S105 needs to evaluate the current fouling thermal resistance based on the thermal performance benchmark conditions, which is a key link to ensure the continuous and efficient operation of the heat exchanger. The thermal performance benchmark conditions refer to the performance indicators that the heat exchanger should have under ideal or standard conditions. These indicators can be derived from design parameters, historical best performance data or manufacturer's specifications.

[0197] First, it is necessary to establish the benchmark conditions for thermal performance, which include environmental parameters such as seawater temperature and flow rate under specific environmental conditions, as well as the design parameters of the heat exchanger itself, such as heat transfer area, material properties and other environmental parameters. These thermal performance benchmark conditions provide a reference standard for the performance of the heat exchanger, making the performance evaluation comparable.

[0198] Next, the current fouling thermal resistance calculated in step S104 is compared with the expected fouling thermal resistance under the reference conditions to evaluate whether the performance of the heat exchanger meets the requirements. For example, if the current fouling thermal resistance is significantly higher than the reference value, it means that the heat transfer efficiency of the heat exchanger is seriously affected and cleaning or maintenance measures need to be taken. On the contrary, if the fouling thermal resistance is close to or lower than the reference value, it indicates that the performance of the heat exchanger is within an acceptable range.

[0199] When evaluating thermal performance, other factors that may affect performance can also be considered, such as changes in the physical properties of the fluid, aging and corrosion of the heat exchanger, etc. These factors may work together with the fouling thermal resistance to affect the overall performance of the heat exchanger. Therefore, these factors should be considered comprehensively during the evaluation process to obtain more comprehensive thermal performance evaluation data.

[0200] It should be understood that through thermal performance evaluation, the corresponding thermal performance evaluation data of the heat exchanger can be obtained. These thermal performance evaluation data can not only include the comparison results of the current fouling thermal resistance and the benchmark conditions, but also include key performance indicators such as the heat transfer efficiency and heat load capacity of the heat exchanger. It should be pointed out that thermal performance evaluation data are crucial to the operation and maintenance management of nuclear power plants. They can help make decisions on whether to clean, repair or replace the heat exchanger in the operation and maintenance of the heat exchanger, thereby ensuring that the heat exchanger of the nuclear power plant is always in a better operating state and ensuring the safe, stable and economical operation of the nuclear power plant. By conducting such thermal performance evaluations regularly, the service life of the heat exchanger can be effectively extended, the risk of unexpected shutdown can be reduced, and the operating efficiency of the entire nuclear power plant can be improved.

[0201] Reference Figure 8 According to some embodiments of the present application, step S105 performs a thermal performance evaluation on the current fouling thermal resistance based on the thermal performance benchmark condition to obtain thermal performance evaluation data, including:

[0202] Step S801, in response to the current fouling thermal resistance being greater than the thermal resistance reference threshold, determining that the current fouling thermal resistance meets the thermal performance reference condition, generating performance qualified data, and determining the performance qualified data as thermal performance evaluation data;

[0203] Step S802, in response to the current fouling thermal resistance being less than or equal to the thermal resistance reference threshold, determining that the current fouling thermal resistance does not meet the thermal performance reference condition, generating thermal performance fault data, and determining the performance fault data as thermal performance evaluation data.

[0204] In some embodiments of the present application, step S105 is a decisive step in the thermal performance evaluation process, which evaluates the current fouling thermal resistance based on the thermal performance benchmark conditions and generates thermal performance evaluation data accordingly. This step is key to ensuring that the nuclear power plant heat exchanger continues to meet performance requirements.

[0205] In step S801 of some embodiments, if the current fouling thermal resistance is greater than the set thermal resistance reference threshold, this means that the fouling thermal resistance of the heat exchanger is within an acceptable range and the performance of the heat exchanger meets the thermal performance reference condition. In this case, the system generates performance qualification data, which indicates that the current working state of the heat exchanger is normal and there is no immediate need for cleaning or maintenance. The performance qualification data is then determined as thermal performance evaluation data, which provides the heat exchanger operation and maintenance tasks with confirmation that the heat exchanger is performing well, allowing them to continue to monitor the operation of the heat exchanger without taking additional measures.

[0206] In step S802 of some embodiments, if the current fouling thermal resistance is less than or equal to the thermal resistance reference threshold, this indicates that the fouling thermal resistance of the heat exchanger exceeds the acceptable range and does not meet the thermal performance reference condition. In this case, the system generates thermal performance fault data, which indicates that the heat exchanger may need cleaning or maintenance to restore its heat transfer efficiency and prevent further performance degradation. The performance fault data is determined as thermal performance evaluation data, which provides a clear indication for the operation and maintenance tasks of the heat exchanger, that is, further inspection and necessary maintenance work on the heat exchanger are required.

[0207] It should be understood that through this evaluation method based on the thermal resistance benchmark threshold, the operating status of the heat exchanger can be effectively monitored and controlled. It not only helps to identify performance problems in a timely manner and avoid potential operating risks, but also optimizes maintenance plans and reduces unnecessary cleaning or maintenance work, thereby improving the operating efficiency and economy of nuclear power plants.

[0208] Reference Fig. 9 , Fig. 9 The hardware structure of an electronic device of another embodiment is illustrated, and the electronic device includes:

[0209] The processor 901 may be implemented by a general-purpose CPU (Central Processing Unit), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of the present application.

[0210] The memory 902 can be implemented in the form of a read-only memory (ROM), a static storage device, a dynamic storage device, or a random access memory (RAM). The memory 902 can store an operating system and other application programs. When the technical solution provided in the embodiment of this specification is implemented by software or firmware, the relevant program code is stored in the memory 902, and the processor 901 calls and executes the thermal performance evaluation method of the nuclear power plant heat exchanger in the embodiment of this application;

[0211] Input / output interface 903, used to implement information input and output;

[0212] Communication interface 904, used to realize communication interaction between the device and other devices, which can be realized through wired mode (such as USB, network cable, etc.) or wireless mode (such as mobile network, WI FI, Bluetooth, etc.);

[0213] A bus 905 that transmits information between various components of the device (e.g., the processor 901, the memory 902, the input / output interface 903, and the communication interface 904);

[0214] The processor 901 , the memory 902 , the input / output interface 903 and the communication interface 904 are connected to each other in communication within the device via a bus 905 .

[0215] The embodiment of the present application further provides a computer program product, which includes a computer program. A processor of a computer device reads and executes the computer program, so that the computer device executes the thermal performance evaluation method of a heat exchanger in a nuclear power plant.

[0216] The terms "first", "second", "third", "fourth", etc. (if any) in the specification of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present disclosure described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "comprises" and "comprising" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0217] It should be understood that in the present disclosure, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0218] It should be understood that in the description of the embodiments of the present application, the meaning of multiple (or multiple items) is more than two, greater than, less than, exceed, etc. are understood to not include the number, and above, below, within, etc. are understood to include the number.

[0219] In the several embodiments provided in the present disclosure, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0220] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0221] In addition, each functional unit in each embodiment of the present disclosure may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0222] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present disclosure is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the various embodiments of the present disclosure. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, referred to as ROM), random access memory (Random Access Memory, referred to as RAM), disk or optical disk and other media that can store program codes.

[0223] It should also be understood that the various implementations provided in the embodiments of the present application can be combined arbitrarily to achieve different technical effects.

[0224] The above is a specific description of the implementation methods of the present disclosure, but the present disclosure is not limited to the above implementation methods. Technical personnel familiar with the art can also make various equivalent modifications or substitutions without violating the spirit of the present disclosure. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present disclosure.

Claims

1. A method for evaluating thermal performance of a heat exchanger in a nuclear power plant, characterized in that: include: Get the current heat exchange parameters of the heat exchanger in the nuclear power plant; Extracting environment-related parameters and environment-independent parameters from the current heat exchange parameters; wherein the environment-related parameters are used to characterize the current heat exchange parameters of the nuclear power plant heat exchanger related to the environment in which it is located, and the environment-independent parameters are used to characterize the current heat exchange parameters of the nuclear power plant heat exchanger that are unrelated to the environment in which it is located; Determining a thermal performance benchmark condition according to the environment-related parameters and the environment-independent parameters; Analyzing the current heat exchange parameters to obtain the current fouling thermal resistance corresponding to the heat exchanger of the nuclear power plant; A thermal performance evaluation is performed on the current fouling thermal resistance based on the thermal performance benchmark condition to obtain thermal performance evaluation data.

2. The method according to claim 1, characterized in that: The environment-related parameters include the current cold side flow rate and the current cold side inlet temperature, and the environment-independent parameters include the operating condition hot side flow rate and the operating condition hot side outlet temperature; Determining the thermal performance reference condition according to the environment-related parameter and the environment-independent parameter includes: Determine the heat exchange area, hot side specific heat capacity, cold side specific heat capacity and operating condition required heat of the heat exchanger of the nuclear power plant; Perform a benchmark calculation based on the heat exchange area, the hot side specific heat capacity, the cold side specific heat capacity, the operating condition heat requirement, the current cold side flow rate, the current cold side inlet temperature, the operating condition hot side flow rate and the operating condition hot side outlet temperature to obtain the thermal performance benchmark data; The thermal performance benchmark conditions are determined according to the thermal performance benchmark data.

3. The method according to claim 2, characterized in that The thermal performance benchmark data is obtained by performing a benchmark calculation based on the heat exchange area, the hot side specific heat capacity, the cold side specific heat capacity, the operating condition heat requirement, the current cold side flow rate, the current cold side inlet temperature, the operating condition hot side flow rate and the operating condition hot side outlet temperature, including: Generate a first analytical element according to the operating condition hot side flow, the hot side specific heat capacity, the current cold side flow and the cold side specific heat capacity; Generating a second analytical element by subtracting the hot side outlet temperature of the working condition from the current cold side inlet temperature; generating a third analytical element according to the required heat of the working condition, the first analytical element and the second analytical element; generating a fourth analytical element based on the product of the heat exchange area and the first analytical element; The thermal performance benchmark data is generated based on the third analytical element and the fourth analytical element.

4. The method according to claim 2, characterized in that: Determining the thermal performance benchmark conditions according to the thermal performance benchmark data includes: Determining a theoretical unscaled thermal resistance corresponding to a heat exchanger of the nuclear power plant; Determining a thermal resistance benchmark threshold value according to the thermal performance benchmark data and the scale-free theoretical thermal resistance; The thermal performance reference condition is set according to the thermal resistance reference threshold.

5. The method according to claim 4, characterized in that The determining of the non-scaling theoretical thermal resistance corresponding to the heat exchanger of the nuclear power plant comprises: Obtaining exchanger design parameters and material property information of the nuclear power plant heat exchanger; The non-scaling theoretical thermal resistance is calculated based on the exchanger design parameters and the material property information.

6. The method according to claim 4, characterized in that The thermal performance evaluation of the current fouling thermal resistance based on the thermal performance benchmark condition to obtain thermal performance evaluation data includes: In response to the current fouling thermal resistance being greater than the thermal resistance reference threshold, determining that the current fouling thermal resistance meets the thermal performance reference condition, generating the performance qualification data, and determining the performance qualification data as the thermal performance evaluation data; In response to the current fouling thermal resistance being less than or equal to the thermal resistance reference threshold, determining that the current fouling thermal resistance does not meet the thermal performance reference condition, generating the thermal performance fault data, and determining the performance fault data as the thermal performance evaluation data.

7. The method according to claim 1, characterized in that Determining the thermal performance reference condition according to the environment-related parameter and the environment-independent parameter includes: Setting a corresponding environment-related margin for the environment-related parameter; The thermal performance reference condition is determined according to the environment-related parameter, the environment-related margin and the environment-independent parameter.

8. The method according to claim 1, characterized in that: The current heat exchange parameter is analyzed to obtain the current fouling thermal resistance corresponding to the heat exchanger of the nuclear power plant, including: Determining a theoretical unscaled thermal resistance corresponding to a heat exchanger of the nuclear power plant; Determining a current heat transfer coefficient based on the current heat exchange parameter; The current fouling thermal resistance corresponding to the heat exchanger of the nuclear power plant is obtained by calculation based on the current heat transfer coefficient and the non-fouling theoretical thermal resistance.

9. The method according to claim 8, characterized in that The calculation based on the current heat transfer coefficient and the non-fouling theoretical heat transfer coefficient to obtain the current fouling thermal resistance corresponding to the heat exchanger of the nuclear power plant includes: constructing a first thermal resistance calculation element according to the current heat transfer coefficient; According to the non-scaling theoretical heat transfer coefficient, construct a second thermal resistance calculation element; The first thermal resistance calculation element and the second thermal resistance calculation element are combined to perform calculation to obtain the current fouling thermal resistance.

10. The method according to claim 9, characterized in that The step of constructing a first thermal resistance calculation element according to the current heat transfer coefficient comprises: The first inverse parameter corresponding to the current heat transfer coefficient is determined as the first thermal resistance calculation element.

11. The method according to claim 10, characterized in that The step of constructing a second thermal resistance calculation element according to the non-scaling theoretical heat transfer coefficient comprises: The second inverse parameter corresponding to the non-scaling theoretical heat transfer coefficient is determined as the second thermal resistance calculation element.

12. The method according to claim 11, characterized in that The combining the first thermal resistance calculation element and the second thermal resistance calculation element to calculate and obtain the current fouling thermal resistance includes: The first thermal resistance calculation element and the second thermal resistance calculation element are calculated by difference processing to obtain the current fouling thermal resistance.

13. The method according to claim 8, characterized in that The heat exchanger of the nuclear power plant includes heat transfer heat and heat exchange average temperature difference, and the current heat transfer coefficient is determined based on the current heat exchange parameter, including: Determining the effective heat exchange area of ​​the heat exchanger of the nuclear power plant; The heat transfer coefficient is calculated in real time based on the heat transfer heat, the heat exchange average temperature difference and the effective heat exchange area to obtain the current heat transfer coefficient.

14. An electronic device, characterized in that: include: A memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the thermal performance evaluation method for a heat exchanger in a nuclear power plant is implemented as described in any one of claims 1 to 13.

15. A computer-readable storage medium, characterized in that: The storage medium stores a program, and the program is executed by a processor to implement the thermal performance evaluation method of a nuclear power plant heat exchanger as described in any one of claims 1 to 13.

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