Method, system and equipment for controlling fouling rate of secondary circuit of nuclear power station and medium

Abstract

The invention provides a method, a system and equipment for controlling the dirt deposition rate of a secondary circuit of a nuclear power station and a medium. The control method comprises the following steps: acquiring operating parameters of fluid in the secondary circuit of the nuclear power station and equipment parameters of all constituent equipment in the secondary circuit; according to the operation parameters, the equipment parameters and a preset power-law corrosion model, calculating the mass of corrosion products released by all constituent equipment in the secondary loop in unit time to obtain corrosion product flux; according to the corrosion product flux and a preset deposition efficiency coefficient, the dirt deposition rate is obtained; wherein the deposition efficiency coefficient represents the proportion of corrosion product flux entering the steam generator and finally depositing in the steam generator; and comparing the dirt retention rate with a preset target rate, and adjusting the operation parameters based on a comparison result until the dirt retention rate obtained according to the adjusted operation parameters is less than or equal to the target rate. The dirt accumulation rate can be reduced to the maximum extent through a control strategy, and the service life of the steam generator is prolonged.

Description

Technical Field

[0001] This invention relates to the field of nuclear power technology, and in particular to a method, system, equipment and medium for controlling the contamination rate of the secondary loop of a nuclear power plant. Background Technology

[0002] The safety and operational performance of a nuclear power plant's steam generator are significantly affected by corrosion products deposited on its secondary loop side. Studies show that only a very small amount of these deposits originate from the internal materials of the steam generator; the vast majority are corrosion products generated by the corrosion of carbon steel equipment such as secondary loop piping, heaters, and condensate systems, which migrate with the feedwater and accumulate in the steam generator. These deposits significantly reduce the thermal efficiency of heat transfer tubes, cause water level fluctuations, and exacerbate corrosion and wear of the heat transfer tubes, thus directly threatening the long-term operational reliability and service life of the steam generator.

[0003] To control fouling in steam generators and ensure the safe operation of nuclear power units, existing technologies primarily mitigate corrosion by monitoring and controlling secondary loop water chemical parameters, such as pH, oxygen content, and impurity ion concentration. However, current chemical control methods typically focus on maintaining static acceptable ranges for water chemical indicators, failing to fully consider the dynamic corrosion coupling effects under different operating environments and equipment. This makes it difficult to achieve refined and preventative control over the entire process of corrosion product migration and deposition. Therefore, areas for improvement exist. Summary of the Invention

[0004] This invention provides a method, system, equipment, and medium for controlling the fouling rate in the secondary loop of a nuclear power plant, in order to solve the technical problem in the prior art that it is difficult to achieve precise and preventive control over the entire process of corrosion product migration and deposition.

[0005] This invention provides a method for controlling the fouling rate in the secondary loop of a nuclear power plant, characterized by comprising: Obtain the operating parameters of the fluids in the secondary loop of the nuclear power plant, as well as the equipment parameters of all components in the secondary loop; Based on the operating parameters, the equipment parameters, and the preset power-law corrosion model, the mass of corrosion products released per unit time by all component equipment in the secondary loop is calculated to obtain the corrosion product flux. The fouling rate is obtained based on the corrosion product flux and the preset deposition efficiency coefficient; wherein, the deposition efficiency coefficient represents the proportion of corrosion products entering the steam generator that are ultimately deposited in the steam generator. The fouling rate is compared with the preset target rate, and the operating parameters are adjusted based on the comparison results until the fouling rate obtained according to the adjusted operating parameters is less than or equal to the target rate.

[0006] In one embodiment of the present invention, the step of calculating the mass of corrosion products released per unit time by all component equipment in the secondary loop based on the operating parameters, the equipment parameters, and a preset power-law corrosion model, to obtain the corrosion product flux, includes: The corrosion rate is calculated based on the thermal-hydraulic parameters, water-chemical parameters, material parameters in the equipment parameters, and the preset power-law corrosion model in the operating parameters. Based on the geometric parameters, material parameters, and corrosion rate of each device in the secondary loop, the mass of corrosion products released by each device per unit time is calculated, and the mass of corrosion products released by all devices in the secondary loop per unit time is statistically analyzed to obtain the corrosion product flux.

[0007] In one embodiment of the present invention, the power-law corrosion model is a mathematical model describing the relationship between corrosion rate and thermal-hydraulic parameters, water chemical parameters, and material parameters, and its expression satisfies: ; in, For corrosion rate, It is the reaction constant; The hydrogen ion activity value in the fluid is determined by the hydrazine concentration and pH value in the water chemistry parameters. It is a natural constant; The activation energy of the reaction is determined by the material parameters, the concentration of hydrazine in the water chemistry parameters, and the pH value. Let be the ideal gas constant, and be a non-zero constant. The fluid temperature is one of the thermal-hydraulic parameters. The fluid velocity is one of the thermal-hydraulic parameters.

[0008] In one embodiment of the invention, the corrosion product flux satisfy: ; in, For corrosion rate, This represents the total number of all components in the secondary circuit. The inner surface area of ​​the equipment in the secondary loop is calculated from the geometric parameters of the equipment. This refers to the material density in the material parameters of the equipment in the secondary loop.

[0009] In one embodiment of the present invention, obtaining the fouling rate based on the corrosion product flux and a preset deposition efficiency coefficient includes: The corrosion product flux is multiplied by a preset transport efficiency factor to obtain the corrosion product flux that migrates to the steam generator inlet; wherein, the transport efficiency factor is expressed as the ratio between the corrosion product flux at the steam generator inlet and the corrosion product flux at the release location. The fouling rate is obtained by multiplying the corrosion product flux at the inlet of the steam generator by a preset deposition efficiency coefficient.

[0010] In one embodiment of the present invention, the step of comparing the dirt accumulation rate with a preset target rate and adjusting the operating parameters based on the comparison result until the dirt accumulation rate obtained according to the adjusted operating parameters is less than or equal to the target rate includes: Determine the rate of dirt accumulation compared to the preset target rate: Maintain operating parameters when the dirt accumulation rate is less than or equal to the target rate; Otherwise, adjust the operating parameters until the dirt accumulation rate obtained based on the adjusted operating parameters is less than or equal to the target rate.

[0011] In one embodiment of the present invention, adjusting the operating parameters until the contamination rate obtained based on the adjusted operating parameters is less than or equal to the target rate includes: The water chemistry parameters in the operating parameters are adjusted, and the adjusted fouling rate is obtained based on the equipment parameters, the adjusted operating parameters, the power-law corrosion model, and the deposition efficiency coefficient. The adjusted fouling rate is compared with the target rate until the adjusted fouling rate is less than or equal to the target rate.

[0012] This invention also proposes a control system for the contamination rate of the secondary loop in a nuclear power plant, comprising: The acquisition unit is used to acquire the operating parameters of the fluids in the secondary loop of the nuclear power plant, as well as the equipment parameters of all components in the secondary loop. The flux calculation unit is used to calculate the mass of corrosion products released per unit time by all component equipment in the secondary loop based on the operating parameters, the equipment parameters and the preset power-law corrosion model, so as to obtain the corrosion product flux. A rate calculation unit is used to obtain the fouling rate based on the corrosion product flux and a preset deposition efficiency coefficient; wherein, the deposition efficiency coefficient represents the proportion of corrosion products entering the steam generator that are ultimately deposited in the steam generator. The adjustment unit is used to compare the dirt accumulation rate with the preset target rate and adjust the operating parameters based on the comparison results until the dirt accumulation rate obtained according to the adjusted operating parameters is less than or equal to the target rate.

[0013] The present invention also proposes an electronic device, the electronic device comprising: One or more processors; A storage device for storing one or more programs, which, when executed by one or more processors, cause the electronic device to implement the control method for the rate of fouling in the secondary loop of a nuclear power plant as described in any of the preceding embodiments.

[0014] The present invention also proposes a computer-readable storage medium having a computer program stored thereon, which, when executed by a computer processor, causes the computer to perform any of the above-described methods for controlling the rate of contamination accumulation in the secondary loop of a nuclear power plant.

[0015] The beneficial effects of this invention are as follows: This invention proposes a method, system, equipment, and medium for controlling the fouling rate of the secondary loop in a nuclear power plant. By utilizing the operating parameters of the fluid in the secondary loop, such as thermal-hydraulic parameters and water chemical parameters, as well as the equipment parameters of all components in the secondary loop, such as geometric parameters and material parameters, and combining them with a power-law corrosion model, the mass of corrosion products released per unit time by all components in the secondary loop can be calculated, thus obtaining the corrosion product flux. The corrosion product flux is essentially a rate value, referring to the mass flow rate of corrosion products released through a certain cross-section or from a certain surface per unit time, used to quantify the intensity of corrosion product generation and migration in the secondary loop. Secondly, based on the corrosion product flux and a preset deposition efficiency coefficient, the fouling rate is obtained. Then, the fouling rate is compared with a preset target rate, and the operating parameters are adjusted based on the comparison results, thereby achieving a fouling rate less than or equal to the target rate obtained with the adjusted operating parameters. This invention can accurately predict and evaluate the fouling rate of steam generators, and through control strategies, minimize the fouling rate and extend the life of the steam generator. Attached Figure Description

[0016] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0017] In the attached diagram: Figure 1 This is a schematic diagram illustrating the steps of a method for controlling the fouling rate of the secondary loop in a nuclear power plant, as provided in an embodiment of the present invention.

[0018] Figure 2 This is a structural block diagram of a control system for the fouling rate of the secondary loop in a nuclear power plant, provided as an embodiment of the present invention.

[0019] Figure 3 This is a structural block diagram of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0020] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0021] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0022] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the invention. However, it will be apparent to those skilled in the art that embodiments of the invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the invention.

[0023] Please see Figures 1 to 3 This invention proposes a method, system, equipment, and medium for controlling the fouling rate of the secondary loop in a nuclear power plant. It can be applied to corrosion control in nuclear power plants. To control the fouling amount in the steam generator (SG), improve its safety and reliability, extend its lifespan, and ensure the safe operation of the nuclear power unit, it is necessary to minimize corrosion in the thermal cycle system to reduce the fouling rate and amount in the steam generator, and to perform fouling calculations. This invention can accurately predict and evaluate the fouling rate of the steam generator, and through optimized control strategies, maximize the reduction of the fouling rate and extend the lifespan of the steam generator. Detailed descriptions are provided below using specific embodiments.

[0024] Please see Figure 1 This invention proposes a method for controlling the fouling rate of the secondary loop in a nuclear power plant, which may include the following steps.

[0025] Step S10: Obtain the operating parameters of the fluid in the secondary loop of the nuclear power plant, as well as the equipment parameters of all components in the secondary loop.

[0026] Specifically, it involves obtaining the operating parameters of the fluids in the secondary loop of the nuclear power plant, as well as the equipment parameters of all components in the secondary loop.

[0027] Operating parameters include water chemical parameters and thermohydraulic parameters. Water chemical parameters include pH, conductivity, hydrazine concentration, iron ion concentration, and alkalizing agent concentration at key points such as feedwater, secondary side water of the steam generator, and condensate. Thermohydraulic parameters include temperature, pressure, flow velocity, and flow regime at key points in the secondary loop.

[0028] Equipment parameters include the material parameters, geometric parameters, and service life of each piece of equipment in the secondary loop. These parameters can be extracted from the nuclear power plant's real-time monitoring system, equipment design database, and historical operation database. Data acquisition can be achieved through real-time monitoring using sensors and instruments distributed throughout the secondary loop, or through periodic offline sampling and analysis, ensuring that the acquired parameters are comprehensive and accurate.

[0029] Step S20: Based on the operating parameters, the equipment parameters, and the preset power-law corrosion model, calculate the mass of corrosion products released per unit time by all component equipment in the secondary loop to obtain the corrosion product flux.

[0030] Specifically, based on operating parameters, equipment parameters, and a preset power-law corrosion model, the mass of corrosion products released per unit time by all components in the secondary loop is calculated to obtain the corrosion product flux.

[0031] For example, firstly, based on the principles of corrosion kinetics, a modified power-law corrosion model is used for calculations. This model comprehensively considers the influence of multiple variables such as temperature, pH, flow rate, and redox potential on the corrosion rate. For each section of pipe, each heater, or other carbon steel equipment in the secondary loop, the corrosion rate on the surface of the equipment is calculated by substituting its material parameters (such as material type and activation energy) and the operating parameters of its location (such as temperature, pH, and flow rate) into the power-law corrosion model. Next, the internal surface area of ​​each piece of equipment is calculated based on its geometric parameters (such as pipe inner diameter and length), and then, combined with the corrosion rate and material density, the mass of corrosion products released by the equipment per unit time is calculated. Finally, the masses of corrosion products released by all equipment in the secondary loop are summed to obtain the total flux of corrosion products released into the fluid from the entire secondary loop.

[0032] In one embodiment of the present invention, step S20 may include the following steps.

[0033] Step S210: Calculate the corrosion rate based on the thermal-hydraulic parameters, water-chemical parameters, material parameters in the equipment parameters, and the preset power-law corrosion model in the operating parameters.

[0034] Specifically, the corrosion rate is calculated based on the thermal-hydraulic parameters, water-chemical parameters, material parameters in the equipment parameters, and a preset power-law corrosion model. The thermal-hydraulic parameters mainly refer to the temperature and flow rate of the secondary loop fluid at key locations. Water-chemical parameters include pH values ​​and hydrazine concentrations at key nodes; material parameters refer to the characteristics of the materials used in the equipment, such as the grade of carbon steel and its corresponding activation energy. These parameters are input into the preset power-law corrosion model, a mathematical expression based on corrosion kinetics principles, whose core is to describe the quantitative relationship between the corrosion rate and variables such as hydrogen ion activity, temperature, and flow rate.

[0035] For example, for a pipe section made of a specific material, based on the temperature, flow rate, pH value and hydrazine concentration of the water sample measured at its location, combined with the inherent reaction constant and activation energy of the material, the instantaneous corrosion rate of the pipe section under the current operating conditions can be obtained through calculation using a power-law corrosion model. This rate reflects the corrosion depth of the metal surface per unit time.

[0036] In one embodiment of the present invention, the power-law corrosion model is a mathematical model describing the relationship between corrosion rate and thermal-hydraulic parameters, water chemical parameters, and material parameters, and its expression satisfies: ; in, For corrosion rate, It is the reaction constant; The hydrogen ion activity value in the fluid is determined by the hydrazine concentration and pH value in the water chemistry parameters. It is a natural constant; The activation energy of the reaction is determined by the material parameters, the concentration of hydrazine in the water chemistry parameters, and the pH value. Let be the ideal gas constant, and be a non-zero constant. The fluid temperature is one of the thermal-hydraulic parameters. The fluid velocity is one of the thermal-hydraulic parameters.

[0037] Step S220: Based on the geometric parameters, material parameters and corrosion rate of each device in the secondary loop, calculate the mass of corrosion products released by each device per unit time, and count the mass of corrosion products released by all devices in the secondary loop per unit time to obtain the corrosion product flux.

[0038] Specifically, based on the geometric parameters, material parameters, and calculated corrosion rate of each device in the secondary loop, the mass of corrosion products released by each device per unit time is calculated.

[0039] For example, geometric parameters, such as the inner diameter, length, and number of bends of equipment like pipes, are used to calculate the internal surface area in contact with the fluid. For each piece of equipment, its accurate internal surface area is calculated using its geometric parameters. Then, combined with the material density from the equipment's material parameters and the corrosion rate calculated in the previous step for the local environment in which the equipment is located, the corrosion depth rate is converted into a mass release rate using a formula. This calculates the mass of corrosion products released by the single piece of equipment into the secondary loop fluid per unit time. This calculation process essentially combines the linear rate of corrosion with material properties and exposed area, thereby quantifying the intensity of each pollution source.

[0040] Next, the mass of corrosion products released per unit time by all equipment in the secondary loop was statistically analyzed to obtain the corrosion product flux. The secondary loop is a complex network composed of numerous pipes, heaters, deaerators, and other equipment. After completing independent calculations for each component of the secondary loop, the calculated mass of corrosion products per unit time for all equipment was algebraically summed. This sum represents the total mass flow rate of corrosion products simultaneously released from the surface of all carbon steel materials into the circulating fluid within the entire secondary loop under a specific operating condition; that is, the corrosion product flux. This flux is the source input data for subsequent assessments of corrosion product migration and steam generator fouling, and its accuracy directly affects the effectiveness of the entire control method.

[0041] In one embodiment of the invention, the corrosion product flux satisfy: ; in, For corrosion rate, This represents the total number of all components in the secondary circuit. The inner surface area of ​​the equipment in the secondary loop is calculated from the geometric parameters of the equipment. This refers to the material density in the material parameters of the equipment in the secondary loop.

[0042] Step S30: Obtain the fouling rate based on the corrosion product flux and the preset deposition efficiency coefficient; wherein, the deposition efficiency coefficient represents the proportion of corrosion products entering the steam generator that are ultimately deposited in the steam generator.

[0043] Specifically, the fouling rate is obtained based on the corrosion product flux and a preset deposition efficiency coefficient. Here, the deposition efficiency coefficient represents the proportion of corrosion products entering the steam generator that are ultimately deposited inside the steam generator. This coefficient is a comprehensive parameter that reflects the complex deposition environment inside the steam generator, including the influence of factors such as flow field, temperature field, and surface characteristics.

[0044] In practical calculations, a transport efficiency factor can be introduced to account for the migration loss of corrosion products from the release point to the steam generator inlet. The transport efficiency factor depends on characteristics such as pipeline layout, flow velocity, and filter efficiency. Multiplying the corrosion product flux by the transport efficiency factor yields the actual corrosion product flux entering the steam generator inlet. Multiplying this inlet flux by the deposition efficiency coefficient allows prediction of the mass of corrosion products deposited inside the steam generator per unit time under the current secondary loop condition, i.e., the fouling rate.

[0045] In one embodiment of the present invention, step S30 includes the following steps.

[0046] Step S310: Multiply the corrosion product flux by a preset transport efficiency factor to obtain the corrosion product flux that migrates to the steam generator inlet; wherein, the transport efficiency factor is expressed as the ratio between the corrosion product flux at the steam generator inlet and the corrosion product flux at the release position.

[0047] Specifically, after calculating the total flux of corrosion products released in the entire secondary loop, it is necessary to further predict how much of it will reach and deposit inside the steam generator. First, this total flux is multiplied by a transport efficiency factor, which reflects various losses in the process of corrosion products migrating from the source to the steam generator inlet (such as deposition in pipes, interception by filters, etc.), thereby obtaining the actual flux of corrosion products entering the secondary working medium of the steam generator.

[0048] Step S320: Multiply the corrosion product flux at the inlet of the steam generator by a preset deposition efficiency coefficient to obtain the fouling rate.

[0049] Specifically, this inlet flux is multiplied by a deposition efficiency coefficient. This coefficient characterizes the proportion of corrosion products that ultimately deposit on critical surfaces such as heat transfer tubes within the complex flow and heat transfer environment inside the steam generator. The result of multiplying the two is the final predicted mass of corrosion products deposited within the steam generator per unit time, which is the fouling rate that needs to be controlled and minimized.

[0050] Step S40: Compare the dirt accumulation rate with the preset target rate, and adjust the operating parameters based on the comparison results until the dirt accumulation rate obtained according to the adjusted operating parameters is less than or equal to the target rate.

[0051] Specifically, the fouling rate is compared with a preset target rate, and operating parameters are adjusted based on the comparison results until the fouling rate obtained according to the adjusted operating parameters is less than or equal to the target rate. The target rate is an upper limit for the fouling rate of the steam generator, preset based on nuclear power plant safety operation standards and economic considerations.

[0052] In one embodiment of the present invention, step S40 may include the following steps.

[0053] Determine the rate of dirt accumulation and the preset target rate: Step S410: When the dirt accumulation rate is less than or equal to the target rate, maintain the operating parameters.

[0054] Step S420: Otherwise, adjust the operating parameters until the dirt accumulation rate obtained based on the adjusted operating parameters is less than or equal to the target rate.

[0055] If the calculated current dirt accumulation rate is less than or equal to the target rate, it indicates that the secondary loop is in good condition and the existing operating parameters should be maintained.

[0056] If the current fouling rate exceeds the target rate, an optimization adjustment process is initiated. Using a built-in intelligent optimization algorithm, the algorithm minimizes the fouling rate as the objective function, with key water chemistry control parameters (such as feedwater pH and hydrazine injection rate) as optimization variables. Under constraints such as water chemistry standards and material compatibility, optimization calculations are performed to find a new, optimal combination of operating parameters. The optimized operating parameters are then sent to actuators such as the chemical dosing system for adjustment. A new cycle of monitoring and calculation then begins until the fouling rate calculated based on the adjusted parameters meets the requirement of not exceeding the target rate, thus achieving continuous, closed-loop, and minimized control of the steam generator's fouling rate.

[0057] In one embodiment of the present invention, step S420, adjusting the operating parameters until the dirt accumulation rate obtained based on the adjusted operating parameters is less than or equal to the target rate, may include the following steps.

[0058] The water chemistry parameters in the operating parameters are adjusted, and the adjusted fouling rate is obtained based on the equipment parameters, the adjusted operating parameters, the power-law corrosion model, and the deposition efficiency coefficient.

[0059] The adjusted fouling rate is compared with the target rate until the adjusted fouling rate is less than or equal to the target rate.

[0060] Specifically, when the predicted fouling rate exceeds the target value, an optimization program is initiated to adjust water chemical parameters (such as pH value and hydrazine content) through algorithms, and the fouling rate is recalculated based on the adjusted parameters until the calculation result meets the target requirements.

[0061] Please see Figure 2 The present invention also proposes a control system 100 for the fouling rate of the secondary loop of a nuclear power plant, which may include an acquisition unit 110, a flux calculation unit 120, a rate calculation unit 130 and an adjustment unit 140.

[0062] The acquisition unit 110 is used to acquire the operating parameters of the fluid in the secondary loop of the nuclear power plant, as well as the equipment parameters of all the components of the secondary loop.

[0063] The flux calculation unit 120 is used to calculate the mass of corrosion products released per unit time by all component equipment in the secondary loop according to the operating parameters, the equipment parameters and the preset power-law corrosion model, so as to obtain the corrosion product flux.

[0064] The rate calculation unit 130 is used to obtain the fouling rate based on the corrosion product flux and the preset deposition efficiency coefficient; wherein, the deposition efficiency coefficient represents the proportion of corrosion products entering the steam generator that are ultimately deposited in the steam generator.

[0065] The adjustment unit 140 is used to compare the dirt accumulation rate with the preset target rate and adjust the operating parameters based on the comparison result until the dirt accumulation rate obtained according to the adjusted operating parameters is less than or equal to the target rate.

[0066] Please see Figure 3 The present invention also proposes an electronic device 200, which may include a memory 210, a processor 220 and a bus, and may also include a computer program stored in the memory 210 and executable on the processor 220, such as a control program for the decontamination rate of the secondary loop of a nuclear power plant.

[0067] The memory 210 includes at least one type of readable storage medium, such as flash memory, portable hard drive, multimedia card, card-type memory (e.g., SD or DX memory), magnetic memory, magnetic disk, optical disk, etc. In some embodiments, the memory 210 can be an internal storage unit of the electronic device 200, such as the portable hard drive of the electronic device 200. In other embodiments, the memory 210 can be an external storage device of the electronic device 200, such as a plug-in portable hard drive, smart media card (SMC), secure digital card (SD), flash card, etc., equipped on the electronic device 200. Furthermore, the memory 210 can include both internal and external storage units of the electronic device 200. The memory 210 can be used not only to store application software and various types of data installed on the electronic device 200, such as code controlling the contamination rate of the secondary loop in a nuclear power plant, but also to temporarily store data that has been output or will be output.

[0068] In some embodiments, processor 220 may be composed of integrated circuits, such as a single packaged integrated circuit or multiple integrated circuits packaged with the same or different functions, including combinations of one or more central processing units (CPUs), microprocessors, digital processing chips, graphics processors, and various control chips. Processor 220 is the control unit of the electronic device 200, connecting various components of the electronic device 200 via various interfaces and lines. It executes programs or modules stored in the memory 210 (e.g., control programs for the secondary loop contamination rate in nuclear power plants) and calls data stored in the memory 210 to perform various functions and process data of the electronic device 200.

[0069] The processor 220 executes the operating system of the electronic device 200 and various installed application programs. The processor 220 executes the application programs to implement the steps in the above-described method for controlling the decontamination rate of the secondary loop in a nuclear power plant.

[0070] For example, the computer program may be divided into one or more modules, which are stored in the memory 210 and executed by the processor 220 to complete this application. The one or more modules may be a series of computer program instruction segments capable of performing specific functions, which describe the execution process of the computer program in the electronic device 200. For example, the computer program may be divided into an acquisition unit 110, a throughput calculation unit 120, a rate calculation unit 130, and an adjustment unit 140.

[0071] The integrated unit implemented as a software functional module described above can be stored in a computer-readable storage medium, which can be non-volatile or volatile. The software functional module, stored in the storage medium, includes several instructions to cause a computer device (which may be a personal computer, computer equipment, or network device, etc.) or processor to execute some functions of the control method for the decontamination rate of the secondary loop of the nuclear power plant described in the various embodiments of this application.

[0072] In summary, the present invention proposes a method, system, equipment, and medium for controlling the fouling rate of the secondary loop in a nuclear power plant. By utilizing the operating parameters of the fluid in the secondary loop, such as thermal-hydraulic and water-chemical parameters, and the equipment parameters of all components in the secondary loop, such as geometric and material parameters, combined with a power-law corrosion model, the mass of corrosion products released per unit time by all components in the secondary loop can be calculated, thus obtaining the corrosion product flux. The corrosion product flux is essentially a rate value, referring to the mass flow rate of corrosion products released through a certain cross-section or from a certain surface per unit time, used to quantify the intensity of corrosion product generation and migration in the secondary loop. Secondly, the fouling rate is obtained based on the corrosion product flux and a preset deposition efficiency coefficient. Then, the fouling rate is compared with a preset target rate, and the operating parameters are adjusted based on the comparison results, thereby achieving a fouling rate less than or equal to the target rate obtained with the adjusted operating parameters. This invention can accurately predict and evaluate the fouling rate of steam generators, and through control strategies, minimize the fouling rate and extend the life of the steam generator.

[0073] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A method for controlling the contamination rate in the secondary loop of a nuclear power plant, characterized in that, include: Obtain the operating parameters of the fluids in the secondary loop of the nuclear power plant, as well as the equipment parameters of all components in the secondary loop; Based on the operating parameters, the equipment parameters, and the preset power-law corrosion model, the mass of corrosion products released per unit time by all component equipment in the secondary loop is calculated to obtain the corrosion product flux. The fouling rate is obtained based on the corrosion product flux and the preset deposition efficiency coefficient; wherein, the deposition efficiency coefficient represents the proportion of corrosion products entering the steam generator that are ultimately deposited in the steam generator. The fouling rate is compared with the preset target rate, and the operating parameters are adjusted based on the comparison results until the fouling rate obtained according to the adjusted operating parameters is less than or equal to the target rate.

2. The method for controlling the contamination rate of the secondary loop in a nuclear power plant according to claim 1, characterized in that, The step involves calculating the mass of corrosion products released per unit time by all component equipment in the secondary loop based on the operating parameters, the equipment parameters, and a preset power-law corrosion model, to obtain the corrosion product flux, including: The corrosion rate is calculated based on the thermal-hydraulic parameters, water-chemical parameters, material parameters in the equipment parameters, and the preset power-law corrosion model in the operating parameters. Based on the geometric parameters, material parameters, and corrosion rate of each device in the secondary loop, the mass of corrosion products released by each device per unit time is calculated, and the mass of corrosion products released by all devices in the secondary loop per unit time is statistically analyzed to obtain the corrosion product flux.

3. The method for controlling the contamination rate of the secondary loop in a nuclear power plant according to claim 2, characterized in that, The power-law corrosion model is a mathematical model describing the relationship between corrosion rate and thermal-hydraulic parameters, water chemical parameters, and material parameters. Its expression satisfies: ； in, For corrosion rate, It is the reaction constant; The hydrogen ion activity value in the fluid is determined by the hydrazine concentration and pH value in the water chemistry parameters. It is a natural constant; The activation energy of the reaction is determined by the material parameters, the concentration of hydrazine in the water chemistry parameters, and the pH value. Let be the ideal gas constant, and be a non-zero constant. The fluid temperature is one of the thermal-hydraulic parameters. The fluid velocity is one of the thermal-hydraulic parameters.

4. The method for controlling the contamination rate of the secondary loop in a nuclear power plant according to claim 2, characterized in that, The corrosion product flux satisfy: ； in, For corrosion rate, This represents the total number of all components in the secondary circuit. The inner surface area of ​​the equipment in the secondary loop is calculated from the geometric parameters of the equipment. This refers to the material density in the material parameters of the equipment in the secondary loop.

5. The method for controlling the contamination rate of the secondary loop in a nuclear power plant according to claim 1, characterized in that, The step of obtaining the fouling rate based on the corrosion product flux and a preset deposition efficiency coefficient includes: The corrosion product flux is multiplied by a preset transport efficiency factor to obtain the corrosion product flux that migrates to the steam generator inlet; wherein, the transport efficiency factor is expressed as the ratio between the corrosion product flux at the steam generator inlet and the corrosion product flux at the release location. The fouling rate is obtained by multiplying the corrosion product flux at the inlet of the steam generator by a preset deposition efficiency coefficient.

6. The method for controlling the contamination rate of the secondary loop in a nuclear power plant according to claim 1, characterized in that, The step of comparing the fouling rate with a preset target rate and adjusting the operating parameters based on the comparison result until the fouling rate obtained according to the adjusted operating parameters is less than or equal to the target rate includes: Determine the rate of dirt accumulation and the preset target rate: Maintain operating parameters when the dirt accumulation rate is less than or equal to the target rate; Otherwise, adjust the operating parameters until the dirt accumulation rate obtained based on the adjusted operating parameters is less than or equal to the target rate.

7. The method for controlling the contamination rate of the secondary loop in a nuclear power plant according to claim 6, characterized in that, The adjustment of operating parameters until the fouling rate obtained based on the adjusted operating parameters is less than or equal to the target rate includes: The water chemistry parameters in the operating parameters are adjusted, and the adjusted fouling rate is obtained based on the equipment parameters, the adjusted operating parameters, the power-law corrosion model, and the deposition efficiency coefficient. The adjusted fouling rate is compared with the target rate until the adjusted fouling rate is less than or equal to the target rate.

8. A control system for the contamination rate of the secondary loop in a nuclear power plant, characterized in that, include: The acquisition unit is used to acquire the operating parameters of the fluids in the secondary loop of the nuclear power plant, as well as the equipment parameters of all components in the secondary loop. The flux calculation unit is used to calculate the mass of corrosion products released per unit time by all component equipment in the secondary loop based on the operating parameters, the equipment parameters and the preset power-law corrosion model, so as to obtain the corrosion product flux. A rate calculation unit is used to obtain the fouling rate based on the corrosion product flux and a preset deposition efficiency coefficient; wherein, the deposition efficiency coefficient represents the proportion of corrosion products entering the steam generator that are ultimately deposited in the steam generator. The adjustment unit is used to compare the dirt accumulation rate with the preset target rate and adjust the operating parameters based on the comparison results until the dirt accumulation rate obtained according to the adjusted operating parameters is less than or equal to the target rate.

9. An electronic device, characterized in that, The electronic device includes: One or more processors; A storage device for storing one or more programs, which, when executed by one or more processors, cause the electronic device to implement the method for controlling the rate of contamination in the secondary loop of a nuclear power plant as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, It stores a computer program that, when executed by the computer's processor, causes the computer to perform the control method for the rate of contamination accumulation in the secondary loop of the nuclear power plant as described in any one of claims 1 to 7.

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