Steam humidity calculation method and device, electronic equipment and storage medium

Abstract

Embodiments of the present application provide a steam humidity calculation method and device, electronic equipment and storage medium, belonging to the nuclear power technology field. The method comprises: obtaining the inlet steam parameters of a steam-water separator; obtaining the outlet steam humidity of the steam-water separator according to the inlet steam parameters of the steam-water separator and the Froude number of the steam-water separator, the Froude number representing the relative size of inertia and gravity in fluid motion; obtaining the outlet steam humidity of the dryer according to the outlet steam humidity of the steam-water separator and the Courant number of the dryer, the Courant number representing the relative size of inertia and gravity and the surface tension of the fluid in fluid motion; and obtaining the outlet steam humidity of the steam generator according to the outlet steam humidity of the dryer and the pressure loss when the steam flows through the flow restrictor. The embodiments of the present application can solve the problem of high test cost and long cycle of the existing steam generator outlet steam humidity calculation method.

Description

Technical Field

[0001] This application relates to the field of nuclear power technology, and in particular to a method, apparatus, electronic device and storage medium for calculating steam humidity. Background Technology

[0002] As a key component of the primary and secondary loops in pressurized water reactor nuclear power plants, the steam generator plays a crucial role in transferring reactor heat to the secondary working fluid and generating steam. Its outlet steam is saturated steam with a certain level of humidity, which directly affects steam quality and turbine operational safety. Therefore, accurately assessing steam humidity is of great significance for steam generator design optimization, engineering verification, and the safe and stable operation of the nuclear power plant. Currently, the secondary side of the steam generator uses a steam-water separator and a dryer to separate the steam-water mixture in stages, ultimately ensuring that the outlet steam humidity is below the specified limit. Accurate humidity measurement is the core basis for evaluating separation efficiency and equipment performance.

[0003] In existing technologies, the determination of steam humidity at the outlet of a steam generator mainly relies on field testing methods, such as injecting a tracer into the secondary loop and monitoring its concentration to infer the humidity value. However, this field testing method is complex to operate, resulting in high testing costs and long testing cycles. Summary of the Invention

[0004] The main objective of this application is to propose a steam humidity calculation method, apparatus, electronic device, and storage medium, aiming to solve the problems of high experimental costs and long cycles in the existing methods for calculating the steam humidity at the outlet of steam generators.

[0005] To achieve the above objectives, a first aspect of this application proposes a steam humidity calculation method applied to a steam generator, the steam generator including a steam-water separator, a dryer, and a flow restrictor, wherein steam flows sequentially through the steam-water separator, the dryer, and the flow restrictor, the method comprising: Obtain the inlet steam parameters of the steam-water separator; The outlet steam humidity of the steam separator is obtained based on the inlet steam parameters and the Froude number of the steam separator. The Froude number characterizes the relative magnitude of inertia and gravity in fluid motion. The outlet steam humidity of the dryer is obtained based on the outlet steam humidity of the steam-water separator and the Kutau number of the dryer. The Kutau number represents the relative magnitudes of inertia and gravity and fluid surface tension during fluid motion. The outlet steam humidity of the steam generator is obtained based on the outlet steam humidity of the dryer and the pressure loss when the steam flows through the flow restrictor.

[0006] In some embodiments, obtaining the inlet steam parameters of the steam-water separator includes: Obtain the structural and operating parameters of the steam generator; A three-dimensional model is obtained by modeling based on the structural parameters. The three-dimensional model includes the secondary side tube bundle area of ​​the steam generator and the steam-water separator. Based on the three-dimensional model, calculation equations are established to calculate the three-dimensional steady-state thermal-hydraulic properties of the secondary side of the steam generator. These equations include the secondary-side tube bundle region flow resistance equation, the primary-side flow heat transfer equation, the secondary-side flow heat transfer equation, and the steam-water separator flow resistance equation. Specifically, the secondary-side tube bundle region flow resistance equation is used to calculate the resistance of the flow path in the secondary-side tube bundle region; the primary-side flow heat transfer equation is used to calculate the primary-side flow heat transfer coefficient; the secondary-side flow heat transfer equation is used to calculate the secondary-side flow heat transfer coefficient; and the steam-water separator flow resistance equation is used to calculate the resistance of the separator. The operating parameters of the steam generator are input into the three-dimensional steady-state thermal-hydraulic calculation equation for calculation to obtain the inlet steam parameters of the steam-water separator.

[0007] In some embodiments, establishing computational equations based on the three-dimensional model includes: The flow resistance in the secondary side tube bundle region is added to the secondary side momentum equation of the steam generator. The secondary-side flow heat transfer equation is added to the secondary-side energy equation of the steam generator; Add the primary-side heat transfer equation to the primary-side energy equation of the steam generator; The secondary-side flow heat transfer equation includes a single-phase flow heat transfer equation, a subcooled boiling heat transfer equation, and a saturated boiling flow heat transfer equation. The single-phase flow heat transfer equation is used to calculate the heat transfer coefficient of single-phase flow heat transfer during the secondary-side heat transfer process. The subcooled boiling heat transfer equation is used to calculate the heat transfer coefficient of subcooled boiling heat transfer during the secondary-side heat transfer process. The saturated boiling heat transfer equation is used to calculate the heat transfer coefficient of saturated boiling heat transfer during the secondary-side heat transfer process. By correlating the parameters in the quadratic mass equation, the quadratic energy equation, and the quadratic momentum equation using the drift flow equation, a correlation equation is obtained. The calculation equation is established based on the correlation equation and the primary energy equation. The drift flow equation is used to describe the drift motion law of the vapor phase relative to the average velocity of the vapor-water mixture in the two-phase flow.

[0008] In some embodiments, obtaining the outlet steam humidity of the steam-water separator based on the inlet steam parameters and the Froude number of the steam-water separator includes: Obtain the height difference between the top of the steam-water separator and the water level; The Froude number corresponding to the steam-water separator is determined based on the steam velocity in the inlet steam parameters and the height difference between the top of the steam-water separator and the water level. Based on the preset mapping relationship between the Froude number and the ineffective separation coefficient, the ineffective separation coefficient corresponding to the Froude number is obtained. The ineffective separation coefficient is used to characterize the ratio of the outlet steam humidity to the inlet steam humidity of the steam-water separator. The outlet steam humidity of the steam separator is obtained based on the inlet steam parameters and the ineffective separation coefficient.

[0009] In some embodiments, the mapping relationship between the Froude number and the invalid separation coefficient is obtained as follows: A hot performance test was conducted on the steam-water separator to obtain the Froude number, inlet steam humidity and outlet steam humidity of the steam-water separator under multiple first operating conditions. The multiple first operating conditions include multiple steam velocities, multiple steam pressures and multiple water level heights corresponding to the inlet of the steam-water separator. For each operating condition, the corresponding ineffective separation coefficient is calculated based on the inlet steam humidity and the outlet steam humidity. Pair the Froude number corresponding to each working condition with the invalid separation coefficient to obtain the mapping relationship between the Froude number and the invalid separation coefficient.

[0010] In some embodiments, obtaining the outlet steam humidity of the dryer based on the outlet steam humidity of the steam-water separator and the number of coulombs in the dryer includes: The inlet steam velocity and liquid surface tension of the dryer are obtained; The number of Kutta corresponding to the dryer is determined based on the inlet steam velocity of the dryer and the surface tension of the liquid; Based on the preset mapping relationship between the number of Kuttan tubes and the outlet steam humidity of the dryer, the outlet steam humidity of the dryer corresponding to the number of Kuttan tubes is obtained.

[0011] In some embodiments, the mapping relationship between the Kutta number and the outlet steam humidity of the dryer is obtained as follows: A hot-state performance test was conducted on the dryer to obtain the number of Kuts and the outlet steam humidity of the dryer under multiple second operating conditions. The multiple second operating conditions included multiple inlet steam velocities and multiple steam pressures of the dryer. By pairing the number of Kuttans corresponding to each operating condition with the outlet steam humidity of the dryer, a mapping relationship between the number of Kuttans and the outlet steam humidity of the dryer is obtained.

[0012] In some embodiments, obtaining the outlet steam humidity of the steam generator based on the outlet steam humidity of the dryer and the pressure loss when the steam flows through the flow restrictor includes: Obtain the pressure loss of steam flowing through the flow restrictor; Based on the outlet steam humidity of the dryer and the pressure loss, the enthalpy of the wet steam at the outlet of the flow restrictor is obtained by establishing an inlet and outlet energy balance equation. The outlet steam humidity of the steam generator is obtained based on the enthalpy value of the wet steam.

[0013] In some embodiments, obtaining the pressure loss of steam flowing through the flow restrictor includes: The first pressure loss caused by friction when steam flows through the flow restrictor is obtained; To obtain the second pressure loss caused by the acceleration of steam in the flow restrictor; The pressure loss is obtained based on the first pressure loss and the second pressure loss.

[0014] In some embodiments, obtaining the outlet steam humidity of the steam generator based on the wet steam enthalpy value includes: Obtain the inlet pressure of the current limiter; The outlet pressure of the flow limiter is obtained based on the inlet pressure and the pressure loss of the flow limiter. Obtain the enthalpy of dry steam and the enthalpy of saturated water at the outlet pressure of the flow restrictor; The outlet steam humidity of the steam generator is calculated based on the enthalpy values ​​of the wet steam, dry steam, and saturated water. To achieve the above objective, a second aspect of this application provides a steam humidity calculation device applied to a steam generator, the steam generator including a steam-water separator, a dryer, and a flow restrictor, wherein steam flows sequentially through the steam-water separator, the dryer, and the flow restrictor, the device comprising: The acquisition module is used to acquire the inlet steam parameters of the steam-water separator; The first calculation module is used to obtain the outlet steam humidity of the steam-water separator based on the inlet steam parameters and the Froude number of the steam-water separator. The Froude number represents the relative magnitude of inertia and gravity in fluid motion. The second calculation module is used to obtain the outlet steam humidity of the dryer based on the outlet steam humidity of the steam-water separator and the Kutau number of the dryer. The Kutau number represents the relative magnitude of inertia and gravity and fluid surface tension in fluid motion. The third calculation module is used to obtain the outlet steam humidity of the steam generator based on the outlet steam humidity of the dryer and the pressure loss when the steam flows through the flow restrictor.

[0015] To achieve the above objectives, a third aspect of the present application provides an electronic device, the electronic device including a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the method described in the first aspect.

[0016] To achieve the above objectives, a fourth aspect of the present application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the method described in the first aspect.

[0017] The steam humidity calculation method, apparatus, electronic equipment, and storage medium proposed in this application obtain the inlet steam parameters of the steam-water separator, calculate the outlet humidity of the steam-water separator using the Froude number, which characterizes the relative magnitude of inertia and gravity, and then calculate the outlet humidity of the dryer using the Kutta number, which characterizes the relative magnitude of inertial force, gravity, and surface tension. Finally, the final outlet steam humidity of the steam generator is determined based on the pressure loss of the flow restrictor and the energy equation. This application establishes a single functional relationship between the performance and parameters of the separation equipment by introducing the Froude number and the Kutta number, and considers the impact of uneven flow distribution by combining three-dimensional modeling. Therefore, it can quickly and accurately evaluate the outlet steam humidity without conducting on-site tests for new steam generator models, saving test costs and providing a basis for design and safe operation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the secondary side wet steam of the steam generator flowing through the steam-water separator provided in the embodiments of this application; Figure 2 This is a schematic diagram of the steam-water separator structure provided in the embodiments of this application; Figure 3 This is a schematic diagram of the flow channel structure of the corrugated plate dryer provided in the embodiments of this application; Figure 4 This is a schematic flowchart of the steam humidity calculation method provided in the embodiments of this application; Figure 5 This is a schematic diagram of the steam humidity calculation device provided in the embodiments of this application; Figure 6 This is a schematic diagram of the hardware structure of the electronic device provided in the embodiments of this application. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0020] It should be noted that although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first," "second," etc., in the specification, claims, and the aforementioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0021] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0022] The steam generator is the hub of the primary and secondary loops of a nuclear power plant. It transfers the heat generated by the reactor to the water on the secondary side and turns it into steam. After steam-water separation, the qualified steam is sent to the steam turbine and drives the generator to generate electricity.

[0023] Compared to conventional thermal power plants, nuclear power plant steam generators produce saturated steam with a certain level of humidity. This means that both the high-pressure and low-pressure cylinders of the turbine operate in a humid steam zone. The humidity of the steam determines its quality and also affects the turbine's operating conditions, making the determination of steam humidity crucial. Therefore, methods for assessing steam humidity in steam generators have always been a key issue in steam generator design and engineering applications. A relatively conservative assessment of the steam humidity at the generator outlet provides sufficient evidence for steam generator design improvements, engineering verification, and the safe operation of nuclear power plants.

[0024] like Figure 1 As shown, in the secondary tube bundle region of the steam generator, subcooled water is heated to form a saturated steam-water mixture. Subsequently, the steam-water mixture flows out of the tube bundle region and enters a cyclone-type steam-water separator. The separator removes most of the moisture from the mixture, and the steam continues to rise into a corrugated plate dryer. After further separation in the dryer, it becomes near-dry saturated steam with a humidity of less than 0.1%. The steam exits the steam generator through a steam outlet pipe equipped with a flow limiter.

[0025] Currently, the most commonly used steam generators in domestic nuclear power plants are vortex separators. Figure 2The diagram shows a typical cyclone separator structure. Although the structures of cyclone separators vary between different manufacturers, they generally consist of an inner cylinder (rising cylinder, 1), a cyclone assembly (3, 4), a descending channel (2), and an upper throttling ring (6). When the mixture of steam and water droplets enters the cyclone separator, it passes through the cyclone assembly, forming a rotating flow channel that forces the vapor-liquid two-phase flow direction to change from vertical to rotation, causing it to rotate at high speed along the inner wall of the separator. Because water droplets are denser than steam, they experience greater centrifugal force and are thrown towards the inner wall of the separator, thus forming a steam column at the center and an annular water layer within the inner wall of the cylinder. Some separators have tangential drain ports on the cylinder wall, from which most of the water is discharged; if there are no drain ports, the water droplets flow downwards along the inner wall of the cylinder, eventually accumulating at the bottom of the separator and being discharged through the drain port. The dry steam, on the other hand, is discharged from the top and enters the dryer.

[0026] like Figure 3 As shown, corrugated plate dryers are commonly used in domestic nuclear power plant steam generators. Corrugated plates are metal plates with a wave-like or zigzag shape. These plates are arranged together to form a complex flow channel for separating steam and water. The working principle is as follows: when an airflow carrying tiny droplets passes through the corrugated plate assembly of the dryer, the tortuous structure of the flow channel causes the airflow to move in a curved path within the corrugated plate. Due to the difference in density and relative mass between the droplets and gas in the airflow, there are differences in centrifugal force, inertial force, and adhesion force. When the droplets pass through the bend, they cannot be deflected with the airflow and instead collide with the corrugated plate. Under the action of adsorption force, they are adsorbed onto the metal corrugated plate wall, which has good adsorption capacity, forming a water film. Under the action of gravity, this film continuously flows downwards, gradually converging into a larger water flow and leaving the corrugated plate dryer. The wet steam finally leaves the steam generator body through the steam generator outlet flow restrictor and enters the main steam pipeline.

[0027] Currently, the humidity of steam at the outlet of steam generators is obtained through actual measurements in nuclear power plants, such as by injecting tracers into the secondary loop and monitoring their concentration to infer humidity values. Furthermore, existing research largely focuses on analyzing the separation performance of steam-water separators and dryers under different operating conditions, without establishing a single functional relationship between separation efficiency and key parameters, thus hindering rapid and universal humidity calculations. Especially when designing new steam generators, the number of separators and the area of ​​the dryer need to be adjusted according to the steam load. Existing experimental methods are costly and time-consuming, and cannot provide real-time humidity assessment during the design phase. They also fail to consider the impact of uneven flow distribution at the inlet of each separator caused by the three-dimensional flow field on the secondary side, potentially leading to humidity calculations that deviate from reality and lack sufficient conservatism. Therefore, there is an urgent need for a rapid calculation method that integrates three-dimensional flow field analysis and equipment performance curves to efficiently and accurately predict the humidity of steam at the steam generator outlet during the design phase.

[0028] Based on this, embodiments of this application provide a steam humidity calculation method, apparatus, electronic device, and storage medium, aiming to solve the problems of high testing costs and long cycles in existing methods for calculating the steam humidity at the outlet of steam generators. Embodiments of this application propose a method for calculating the steam humidity at the outlet of a steam generator. For the steam-water separator and dryer inside the steam generator, after obtaining their resistance and steam-water separation performance curves through experiments, this calculation method can quickly calculate the outlet humidity value of the steam generator under different operating conditions, without the need for on-site testing.

[0029] The steam humidity calculation method, apparatus, electronic device and storage medium provided in the embodiments of this application are specifically described through the following embodiments. First, the steam humidity calculation method in the embodiments of this application is described.

[0030] The steam humidity calculation method provided in this application relates to the field of nuclear power technology. The steam humidity calculation method provided in this application can be applied to a terminal, a server, or software running on either a terminal or a server. In some embodiments, the terminal can be a smartphone, tablet, laptop, desktop computer, etc.; the server can be configured as an independent physical server, a server cluster or distributed system composed of multiple physical servers, or a cloud server providing basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, CDN, and big data and artificial intelligence platforms; the software can be an application implementing the steam humidity calculation method, but is not limited to the above forms.

[0031] This application can be used in a wide variety of general-purpose or special-purpose computer system environments or configurations. Examples include: personal computers, server computers, handheld or portable devices, tablet devices, multiprocessor systems, microprocessor-based systems, set-top boxes, programmable consumer electronics, network PCs, minicomputers, mainframe computers, and distributed computing environments including any of the above systems or devices. This application can be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc., that perform specific tasks or implement specific abstract data types. This application can also be practiced in distributed computing environments where tasks are performed by remote processing devices connected via a communication network. In distributed computing environments, program modules can reside in local and remote computer storage media, including storage devices.

[0032] It should be noted that in all specific embodiments of this application, when processing data related to user identity or characteristics, such as user information, user behavior data, user historical data, and user location information, user permission or consent is obtained first. Furthermore, the collection, use, and processing of this data comply with relevant laws, regulations, and standards. In addition, when embodiments of this application require access to sensitive personal information of users, separate permission or consent from the user is obtained through pop-ups or redirection to confirmation pages. Only after obtaining the user's separate permission or consent is the necessary user-related data required for the proper functioning of these embodiments acquired.

[0033] Figure 4 This is an optional flowchart of the steam humidity calculation method provided in this application embodiment, applied to a steam generator, which includes a steam-water separator, a dryer, and a flow restrictor, through which steam flows sequentially. Figure 4 The method may include, but is not limited to, steps S100 to S400.

[0034] Step S100: Obtain the inlet steam parameters of the steam-water separator.

[0035] In this embodiment, to accurately obtain the inlet parameters of each steam-water separator, and considering the non-uniformity of steam-water distribution in the secondary tube bundle region of the steam generator, a three-dimensional geometric model can be performed on the secondary tube bundle region of the steam generator and the steam-water separator region. The geometric model includes heat transfer tubes, tube support plates, vibration damping strips, steam-water separators, etc., wherein the heat transfer tubes can be simplified using a porous media method.

[0036] A three-dimensional thermal-hydraulic calculation model of the steam generator is established. By solving the general mass, energy, and momentum equations, the inlet parameters (such as flow rate, pressure, and inlet steam humidity) of each separator are calculated. This model requires establishing a flow resistance model for the secondary side tube bundle region (including frictional resistance and local resistance), primary and secondary side flow and heat transfer models (including single-phase flow heat transfer, subcooled boiling heat transfer, and saturated boiling heat transfer models), and a flow resistance model for the steam-water separator. For the two-phase flow on the secondary side, a drift flow model is used to describe the interaction between the steam and water phases. Given the primary side fluid parameters (fluid mass, inlet and outlet temperatures), secondary side fluid inlet parameters (flow rate, enthalpy), and structural component resistance coefficients, the steam parameters at the inlet of each steam-water separator can be accurately obtained by solving the above equations.

[0037] Step S200: Based on the inlet steam parameters and the Froude number of the steam-water separator, the outlet steam humidity of the steam-water separator is obtained. The Froude number characterizes the relative magnitude of inertia and gravity in fluid motion.

[0038] In this embodiment, the separation effect of the rotary vane separator is related to the centrifugal force and gravity of the fluid. Therefore, the Froude number (Fr) is introduced, and a relationship curve between the Froude number and the separation efficiency is established through hot-state performance tests of the steam-water separator. The Froude number is a dimensionless coefficient characterizing the relative magnitude of inertial force and gravity in fluid motion. Its physical significance lies in quantifying the core mechanical equilibrium relationship of the gas-liquid two-phase separation within the steam-water separator, which can be derived from the structural parameters of the steam-water separator, inlet steam velocity, and pressure. A single functional relationship curve between the Froude number and the separation coefficient (ineffective separation coefficient η) can be pre-established through hot-state performance tests of the steam-water separator. This curve can be adapted to operating conditions with different pressures, inlet velocities, and water levels.

[0039] Specifically, based on the working principle of the steam-water separator (based on centrifugal force and gravity separation), the Froude number is introduced to establish the separation performance relationship.

[0040] First, the Froude number (Fr) is calculated based on the obtained inlet steam parameters and structural parameters of the steam-water separator. The formula for calculating the Froude number is shown in formula (1): (1); Where C1 is a correction factor, which is pressure-related; V is the inlet gas velocity, m / s; and g is the gravitational acceleration, m / s². 2 h is the height difference between the top of the steam-water separator and the water level, in meters.

[0041] Ineffective separation coefficient ( It can be derived from formula (2): (2); in, It is a Froude number ( ) and steam humidity at the inlet of the steam-water separator ( The function is derived from experimental data.

[0042] Finally, based on the inlet steam parameters and separator structure, the Froude number is calculated, and the separation coefficient is obtained from the separator performance curve. From the separator inlet steam humidity, the outlet steam humidity is then calculated. The result can be obtained through formula (3): (3).

[0043] Step S300: Based on the outlet steam humidity of the steam-water separator and the Coulter number of the dryer, the outlet steam humidity of the dryer is obtained. The Coulter number represents the relative magnitude of inertia and gravity and fluid surface tension during fluid motion.

[0044] In this embodiment, the steam after coarse separation by the steam-water separator enters the corrugated plate dryer for fine separation. The separation mechanism of the dryer combines inertial impaction, gravitational settling, and surface adhesion. This embodiment introduces the Kutta number (Ku) to comprehensively characterize the relative importance of inertial force, gravity, and surface tension. The Kutta number is a dimensionless coefficient characterizing the relative magnitude of inertial force, gravity, and fluid surface tension in fluid motion. Its core function is to match the separation mechanism of the corrugated plate dryer—the separation effect of the dryer depends on the synergistic effect of inertial separation, gravitational separation, and surface condensation. The Kutta number can comprehensively quantify the relative influence of the above three types of forces.

[0045] First, the Kutau number is calculated based on the outlet steam humidity of the steam-water separator and the inlet parameters of the dryer (such as steam velocity and pressure). The formula for calculating the Kutau number (Ku) is shown in formula (4): (4); Where C2 is a correction factor, which is pressure-related; V is the steam velocity at the dryer inlet, in m / s; ρ is the surface tension of the liquid, N / m.

[0046] For specific models of corrugated plate dryers, a hot-state test must be conducted beforehand to determine the outlet humidity under different inlet conditions (pressure, velocity, inlet humidity). A curve showing the relationship between outlet humidity and the Kutah number (Ku) should be plotted. Using the calculated Kutah number, the corresponding dryer outlet steam humidity in the relationship curve should be located.

[0047] Step S400: Obtain the outlet steam humidity of the steam generator based on the outlet steam humidity of the dryer and the pressure loss when the steam flows through the flow restrictor.

[0048] In this embodiment, the humidity at the outlet of the flow restrictor is calculated based on the humidity at the dryer outlet, taking into account the pressure loss of steam flowing through the flow restrictor and the pressure drop caused by steam acceleration. The water generated by the pressure drop does not originate from the steam generator, but is generated by steam condensation. Given the cross-sectional area of ​​the flow restrictor, the height difference between the front and rear sections, the operating parameters of the front section of the flow restrictor (pressure, steam flow rate, and humidity), and the pressure loss coefficient through the flow restrictor, the outlet pressure and outlet steam velocity of the flow restrictor are obtained according to Bernoulli's equation.

[0049] Specifically, the wet steam from the dryer flows out through the flow restrictor. This process requires consideration of pressure loss and enthalpy change caused by steam acceleration. First, given the cross-sectional area and height difference before and after the flow restrictor, the operating parameters of the section before the flow restrictor (pressure, steam flow rate, and humidity), and the pressure loss coefficient through the flow restrictor, the outlet pressure and outlet steam velocity after the flow restrictor are calculated according to Bernoulli's equation. Next, the inlet and outlet energy balance equation is established. The sum of the inlet enthalpy and kinetic energy is equal to the sum of the outlet enthalpy and kinetic energy. The inlet wet steam enthalpy is obtained by looking up the property table based on the inlet pressure and humidity. Combined with the known outlet pressure and outlet wet steam velocity (i.e., outlet kinetic energy), the outlet wet steam enthalpy is calculated. Finally, the outlet steam humidity is calculated based on the outlet wet steam enthalpy. The calculation formula is shown in formula (5): (5); in, The enthalpy of wet vapor is kJ / kg; Given the enthalpy of dry steam (kJ / kg) and the pressure after the flow restrictor, the value can be obtained by referring to the steam-water property table. Given the enthalpy of saturated water (kJ / kg) and the pressure after the flow restrictor, this value can be obtained by referring to the steam-water property table.

[0050] This embodiment establishes a single functional relationship between dimensionless coefficients (Froude number and Kutta number) and separation performance, enabling rapid calculation of steam humidity under different operating conditions and design parameters (number of separators, flow area of ​​dryer) without repeated on-site testing. This meets the rapid evaluation requirements for newly designed steam generators. By accurately quantifying the core separation mechanisms of the steam-water separator and dryer using the Froude number and Kutta number respectively, and combining the pressure loss and energy balance of the flow restrictor, it comprehensively considers the mechanical characteristics and thermal changes during steam flow. The calculation results are reliable and can provide an accurate basis for steam quality assessment. It is compatible with various steam generator designs using the same type of steam-water separator and dryer. As long as the thermal parameters are within the applicable range of the test curve, it can be directly applied, providing sufficient support for steam generator design improvement, engineering verification, and the safe and stable operation of nuclear power plants.

[0051] In some embodiments, step S100 may include, but is not limited to, steps S110 to S140: Step S110: Obtain the structural parameters and operating parameters of the steam generator; Step S120: Model the structure according to the structural parameters to obtain a three-dimensional model, which includes the secondary side tube bundle area of ​​the steam generator and the steam-water separator. Step S130: Based on the three-dimensional model, establish calculation equations. These equations are used to calculate the three-dimensional steady-state thermal-hydraulic properties of the secondary side of the steam generator. The three-dimensional steady-state thermal-hydraulic calculation equations include the secondary side tube bundle region flow resistance equation, the primary side flow heat transfer equation, the secondary side flow heat transfer equation, and the steam-water separator flow resistance equation. Specifically, the secondary side tube bundle region flow resistance equation is used to calculate the resistance of the flow path in the secondary side tube bundle region; the primary side flow heat transfer equation is used to calculate the primary side flow heat transfer coefficient; the secondary side flow heat transfer equation is used to calculate the secondary side flow heat transfer coefficient; and the steam-water separator flow resistance equation is used to calculate the resistance of the separator. Step S140: Input the operating parameters of the steam generator into the three-dimensional steady-state thermal-hydraulic calculation equation for calculation to obtain the inlet steam parameters of the steam-water separator.

[0052] In this embodiment, firstly, based on the structural parameters of the steam generator, geometric reconstruction is performed using 3D modeling software. The structural parameters include, but are not limited to, the geometric dimensions and arrangement of the heat transfer tubes, the structural parameters of the tube support plate and vibration damping strips, the structural dimensions of the steam-water separator, and the geometric parameters of the secondary side shell.

[0053] Considering the non-uniformity of steam-water distribution in the secondary tube bundle region of the steam generator, a three-dimensional geometric model is constructed for both the secondary tube bundle region and the steam-water separator region. The three-dimensional geometric model should at least cover the secondary tube bundle region and the steam-water separator region of the steam generator, including key components such as heat transfer tubes, tube support plates, vibration damping strips, and the steam-water separator. For the large number of regularly arranged heat transfer tube bundles, a porous media model can be used for equivalent simplification; the influence of the steam-water separator blades on the steam flow process on the secondary side of the steam generator is considered by introducing a resistance calculation model.

[0054] In this embodiment, after completing geometric modeling and computational mesh generation, a complete three-dimensional steady-state thermal-hydraulic calculation equation system needs to be established. This system uses the general mass conservation equation, momentum conservation equation, and energy conservation equation as its core framework, and embeds a series of dedicated calculation models for the specific physical processes of the steam generator.

[0055] Specifically, the flow resistance equation for the secondary side tube bundle region is used to characterize the resistance of the flow path in the secondary side tube bundle region. This resistance equation integrates the frictional resistance of the tube bundle region, the local resistance of the fluid flowing through the tube support plate, the resistance of the bend region, and the local resistance generated by the vibration damping strip. These resistance terms are added to the source terms of the secondary side fluid momentum equation.

[0056] The primary-side flow heat transfer equation is used to calculate the flow heat transfer coefficient of the primary-side coolant. Since the primary side is in a high-pressure, single-phase subcooled state and does not involve phase change, this model mainly considers the heat transferred by the coolant to the secondary side through the heat transfer tube wall.

[0057] The secondary-side flow heat transfer equation is used to calculate the flow heat transfer coefficients in different regions of the secondary side. Due to the complex operating conditions on the secondary side, where the working fluid is heated from undersaturated water to a saturated boiling state, this equation covers three modes: single-phase flow heat transfer, subcooled boiling heat transfer, and saturated boiling flow heat transfer. Based on the thermodynamic state of the fluid, the corresponding heat transfer model is automatically invoked to calculate the heat transfer coefficient, which is then added to the secondary-side fluid energy equation.

[0058] The flow resistance equation for a steam-water separator is used to characterize the resistance of the separator. This model incorporates the separator's resistance characteristics into the momentum equation to accurately calculate the pressure field before the fluid enters the separator.

[0059] In addition, in order to describe the interaction between the vapor and liquid phases, the model also uses a drift flow model to calculate the drift motion law of the vapor phase relative to the average velocity of the vapor-liquid mixture in the vapor-liquid two-phase flow, thereby obtaining key parameters such as cavitation fraction, interphase velocity, and two-phase flow resistance loss.

[0060] The operating parameters of the steam generator are used as boundary and initial conditions, and input into the established three-dimensional steady-state thermo-hydraulic calculation model for solution. By iteratively solving the mass, momentum, and energy equations throughout the computational domain, a convergent three-dimensional steady-state flow field satisfying all physical conservation laws can be obtained. From this flow field result, detailed steam parameters at the inlet section of each steam-water separator can be directly extracted or calculated, including the inlet steam flow rate, pressure, and humidity of each separator.

[0061] This embodiment overcomes the shortcomings of existing one-dimensional calculations that ignore the uneven distribution of steam and water by establishing a three-dimensional geometric model of the secondary side tube bundle region and the steam-water separator. By combining four types of targeted flow and heat transfer equations and drift flow models, it comprehensively considers the complex flow resistance, heat transfer characteristics and steam-liquid two-phase interaction of the secondary side. The calculated inlet steam parameters are more in line with the actual working conditions, providing an accurate basis for subsequent full-process humidity calculations.

[0062] In some embodiments, step S130 may include, but is not limited to, the following steps: The flow resistance in the secondary side tube bundle region is added to the secondary side momentum equation of the steam generator. The secondary-side flow heat transfer equation is added to the secondary-side energy equation of the steam generator; Add the primary-side heat transfer equation to the primary-side energy equation of the steam generator; The secondary-side flow heat transfer equation includes a single-phase flow heat transfer equation, a subcooled boiling heat transfer equation, and a saturated boiling flow heat transfer equation. The single-phase flow heat transfer equation is used to calculate the heat transfer coefficient of single-phase flow heat transfer during the secondary-side heat transfer process. The subcooled boiling heat transfer equation is used to calculate the heat transfer coefficient of subcooled boiling heat transfer during the secondary-side heat transfer process. The saturated boiling heat transfer equation is used to calculate the heat transfer coefficient of saturated boiling heat transfer during the secondary-side heat transfer process. By correlating the parameters in the quadratic mass equation, the quadratic energy equation, and the quadratic momentum equation using the drift flow equation, a correlation equation is obtained. The calculation equation is established based on the correlation equation and the primary energy equation. The drift flow equation is used to describe the drift motion law of the vapor phase relative to the average velocity of the vapor-water mixture in the two-phase flow.

[0063] In this embodiment, the establishment of the three-dimensional steady-state thermo-hydraulic calculation equations is a process of systematically integrating various local physical models into the core governing equations. Its core lies in solving the entire complex flow and heat transfer system through specific source term addition methods and the introduction of advanced two-phase flow models. The calculations are based on the governing equations of the three conservation laws of mass, momentum, and energy.

[0064] Specifically, in order to accurately simulate the flow pressure distribution of fluid in the steam generator, the frictional resistance and local resistance calculated by the secondary side tube bundle region flow resistance model, as well as the additional resistance calculated by the steam-water separator flow resistance model, are added to the momentum conservation equation describing the flow of the secondary side working fluid in the form of momentum source terms.

[0065] To simulate the heat transfer process, energy equations were established on both the secondary and primary sides, and corresponding heat transfer models were added to these equations. For the secondary side, the secondary-side flow heat transfer equation was added to the secondary-side energy equation of the steam generator. Since the secondary side of the steam generator operates under the most complex conditions, with the working fluid being heated from inlet single-phase undersaturated water to a saturated boiling state, the heat transfer mechanism changes with the fluid state. Therefore, the secondary-side flow heat transfer equation covers three modes: a single-phase flow heat transfer equation to calculate the heat transfer coefficient of single-phase water flow during the secondary-side heat transfer process; a subcooled boiling heat transfer equation to calculate the subcooled boiling heat transfer coefficient when the wall temperature is higher than the saturation temperature but the mainstream liquid is still in a subcooled state; and a saturated boiling flow heat transfer equation to calculate the heat transfer coefficient after the fluid enters a saturated boiling state. Based on the thermodynamic state of the fluid at different locations on the secondary side, the corresponding heat transfer models were automatically invoked to calculate the heat transfer coefficient, and this coefficient was added as a source term to the secondary-side energy equation.

[0066] For the primary side, the primary side flow heat transfer equation is added to the primary side energy equation of the steam generator. Considering that the primary side is in a high-pressure, single-phase subcooled state and does not involve phase change, this equation is mainly used to calculate the heat transfer coefficient between the coolant and the heat transfer tube wall, thereby determining the heat transfer from the primary side to the secondary side.

[0067] The secondary side of a steam generator involves complex two-phase steam-liquid flow. To accurately describe the interaction between the two phases, a drift flow equation is used to correlate the parameters in the secondary side mass, energy, and momentum equations, resulting in a correlated equation. The drift flow equation describes the drift motion of the vapor phase relative to the average velocity of the steam-liquid mixture in the two-phase flow. Using this model, key parameters such as the cavitation fraction, interphase velocity slip, and two-phase flow resistance losses can be calculated. This means that when solving the mass, momentum, and energy equations on the secondary side, the drift flow model is used to consider the mass, momentum, and energy exchange between the two phases, thus closing the aforementioned equation set.

[0068] This embodiment precisely integrates the flow resistance, heat transfer equations, and core conservation equations, and uses the drift flow equation to achieve a deep correlation between the secondary mass, energy, and momentum equations. This solves the problem of independent equations and inconsistent parameters in the prior art, ensuring that the calculation logic is self-consistent and the results are reliable.

[0069] In some embodiments, step S200 may include, but is not limited to, steps S210 to S240: Step S210: Obtain the height difference between the top of the steam-water separator and the water level; Step S220: Determine the Froude number corresponding to the steam-water separator based on the steam velocity in the inlet steam parameters of the steam-water separator and the height difference between the top of the steam-water separator and the water level. Step S230: Based on the preset mapping relationship between the Froude number and the ineffective separation coefficient, the ineffective separation coefficient corresponding to the Froude number is obtained. The ineffective separation coefficient is used to characterize the ratio of the outlet steam humidity to the inlet steam humidity of the steam-water separator. Step S240: Obtain the outlet steam humidity of the steam separator based on the inlet steam parameters of the steam separator and the ineffective separation coefficient.

[0070] In this embodiment, in addition to fluid dynamic parameters, the geometric characteristic parameters of the steam-water separator, namely the height difference (h) between the top of the steam-water separator and the water level, are also required when calculating the Froude number. This height difference is an important geometric factor affecting the gravity separation effect and the stability of the swirling flow field.

[0071] Using the steam velocity (V) and height difference (h) in the inlet steam parameters of the steam-water separator obtained through three-dimensional thermal-hydraulic calculations, the Froude number (Fr) corresponding to the steam-water separator can be calculated. The Froude number characterizes the relative magnitude of inertial force and gravity in fluid motion.

[0072] Based on the calculated Froude number, a preset mapping relationship between the Froude number and the ineffective separation coefficient (η) is looked up to obtain the ineffective separation coefficient corresponding to that Froude number. The ineffective separation coefficient characterizes the ratio of the outlet steam humidity to the inlet steam humidity of the steam-water separator; its physical meaning is the ratio of the separated water flow rate to the inlet water flow rate of the steam-water separator. This mapping relationship typically exists in the form of a steam-water separator performance curve, which is obtained through hot-state performance tests on a specific model of steam-water separator. In practical applications, it serves as a design input parameter for designing steam generators.

[0073] Finally, using the calculated inlet steam parameters of the steam-water separator (mainly including inlet steam humidity) and the ineffective separation coefficient, the outlet steam humidity of the steam-water separator is calculated.

[0074] This embodiment condenses the complex separation performance of a steam-water separator, which is affected by multiple variables (pressure, flow rate, water level, and inlet humidity) in actual operation, into a simple operation that queries a single performance curve using the Froude number. The preset mapping relationship between the Froude number and the invalid separation coefficient can be established experimentally in one go. Subsequent calculations only need to substitute the inlet parameters and height difference to quickly solve the problem, eliminating the need to repeat on-site tests. This meets the rapid evaluation requirements of newly designed steam generators and significantly improves computational efficiency.

[0075] In some embodiments, the mapping relationship between the Froude number and the invalid separation coefficient is obtained as follows: A hot performance test was conducted on the steam-water separator to obtain the Froude number, inlet steam humidity and outlet steam humidity of the steam-water separator under multiple first operating conditions. The multiple first operating conditions include multiple steam velocities, multiple steam pressures and multiple water level heights corresponding to the inlet of the steam-water separator. For each operating condition, the corresponding ineffective separation coefficient is calculated based on the inlet steam humidity and the outlet steam humidity. Pair the Froude number corresponding to each working condition with the invalid separation coefficient to obtain the mapping relationship between the Froude number and the invalid separation coefficient.

[0076] In this embodiment, the mapping relationship between the Froude number and the ineffective separation coefficient (i.e., the performance curve of the steam-water separator) is not the result of theoretical derivation, but is based on a systematic and multi-dimensional hot-state performance test of a specific model of steam-water separator. This test aims to simulate various operating conditions in actual operation and, based on data, empirically construct a complete spectrum of its separation performance.

[0077] To obtain data covering the actual operating range, hot-state performance tests are required for specific models of steam-water separators. The actual operating conditions of the secondary side of the steam generator are simulated on a test bench, and test parameters are adjusted to cover multiple primary operating conditions. These conditions must include multiple steam velocities, multiple steam pressures, and multiple water levels corresponding to the steam-water separator inlet. For each operating condition, corresponding operating data is obtained through experimental measurements, mainly including the current steam velocity (used to calculate the Froude number), and the corresponding inlet and outlet steam humidity.

[0078] For each operating condition obtained in the experiment, the ineffective separation coefficient corresponding to that condition is calculated based on the measured inlet and outlet steam humidity. The ineffective separation coefficient is used to characterize the ratio of the outlet steam humidity to the inlet steam humidity of the steam-water separator. Its calculation is based on the principle of mass conservation, that is, the actual separation capacity of the separator under that operating condition is determined by the humidity difference between the inlet and outlet.

[0079] The ineffective separation coefficient calculated for each operating condition is paired with the corresponding Froude number. By accumulating data points under multiple different operating conditions (covering different pressures, velocities, and water levels), a mapping relationship between the Froude number and the ineffective separation coefficient is established using data fitting or regression analysis methods.

[0080] This embodiment establishes a mapping relationship between the Froude number and the ineffective separation coefficient, which can normalize complex fluid dynamic parameters (such as pressure, velocity, and geometry) into the Froude number, thereby quickly and accurately determining the corresponding ineffective separation coefficient. Once the mapping relationship is established, it can be used as the design input parameter for this type of steam-water separator, and can be used for rapid calculation of steam humidity under different operating conditions for subsequent similar steam generators.

[0081] In some embodiments, step S300 may include, but is not limited to, steps S310 to S330: Step S310: Obtain the inlet steam velocity and liquid surface tension of the dryer; Step S320: Determine the number of Kutta corresponding to the dryer based on the inlet steam velocity of the dryer and the surface tension of the liquid; Step S330: Based on the preset mapping relationship between the number of Kuttan tubes and the outlet steam humidity of the dryer, obtain the outlet steam humidity of the dryer corresponding to the number of Kuttan tubes.

[0082] In this embodiment, after calculating the outlet steam humidity of the steam-water separator, the corresponding steam flow rate is used as the inlet flow rate of the dryer. The inlet steam velocity (V) of the dryer is calculated based on the flow area of ​​the dryer. Simultaneously, the corresponding liquid surface tension (s) is obtained by consulting a water vapor property table based on the steam pressure and temperature at the dryer inlet. Using the obtained inlet steam velocity and liquid surface tension, combined with the gravitational acceleration g, the corresponding Kutta number of the dryer can be calculated.

[0083] Based on the preset mapping relationship between the number of Kutrolleys and the outlet steam humidity of the dryer, the corresponding dryer outlet steam humidity for the calculated Kutrolley number Ku is found. This mapping relationship is typically presented as a performance curve or data table. This relationship is obtained beforehand through hot-state performance testing of the dryer. During the test, different operating conditions (covering different steam pressures, inlet steam velocities, and inlet steam humidity) are adjusted, and the corresponding outlet steam humidity is measured, thus establishing the correspondence between the number of Kutrolleys (covering the effects of pressure and velocity) and the outlet steam humidity. In actual calculations, the humidity of the steam after separation by the dryer can be quickly and accurately obtained simply by using the calculated Kutrolley number and this mapping relationship.

[0084] This embodiment simplifies the complex multi-mechanism separation process of the dryer into a query calculation process based on a key dimensionless number by introducing the Kuta number and utilizing pre-made performance curves. This avoids the time-consuming and difficult simulation calculation of the complex three-dimensional two-phase flow inside the dryer, and significantly improves the overall humidity calculation efficiency.

[0085] In some embodiments, the mapping relationship between the Kutta number and the outlet steam humidity of the dryer is obtained as follows: A hot-state performance test was conducted on the dryer to obtain the number of Kuts and the outlet steam humidity of the dryer under multiple second operating conditions. The multiple second operating conditions included multiple inlet steam velocities and multiple steam pressures of the dryer. By pairing the number of Kuttans corresponding to each operating condition with the outlet steam humidity of the dryer, a mapping relationship between the number of Kuttans and the outlet steam humidity of the dryer is obtained.

[0086] In this embodiment, the establishment of the mapping relationship between the Kuttan number and the outlet steam humidity of the dryer (i.e., the dryer performance curve) also relies on a systematic hot-state performance test of a specific type of corrugated plate dryer. This test aims to obtain separation performance data of the dryer over a wide operating range and to summarize and characterize it based on the dimensionless parameter of the Kuttan number. Specifically, by attributing changes in pressure and inlet velocity to the Kuttan number, the performance curves of the Kuttan number and outlet steam humidity under different inlet steam humidities can be obtained through the dryer hot-state performance test.

[0087] The actual operating environment of the corrugated plate dryer within the steam generator was simulated on a test bench. To obtain comprehensive data covering the actual operating range, tests were conducted under multiple secondary operating conditions. These secondary operating conditions included multiple different dryer inlet steam humidities, multiple different dryer inlet steam velocities, and multiple different steam pressures. By adjusting the test setup, the steam flow rate and pressure were varied to simulate the dryer's operating state under different loads and thermal conditions.

[0088] For each test condition, the outlet steam humidity of the dryer under that condition is obtained using measuring instruments. Simultaneously, using the operating parameters measured under that condition (mainly including dryer inlet steam velocity, steam pressure, liquid surface tension, and gravitational acceleration), the corresponding Kutta number is calculated according to the definition formula for the Kutta number.

[0089] The calculated Coulomb number for each operating condition is paired one-to-one with the measured steam humidity at the dryer outlet. By organizing, fitting, or performing regression analysis on the paired data points from multiple operating conditions, a correspondence between the Coulomb number and the steam humidity at the dryer outlet is established, i.e., the mapping relationship. This mapping relationship is usually expressed in the form of performance curves or empirical formulas, reflecting the actual separation effect of the dryer under different Coulomb numbers (i.e., different flow conditions and physical property parameters), providing a basis for subsequent rapid calculation of steam humidity.

[0090] This embodiment uses scientific experimental methods to transform the complex separation process of inertia, gravity and surface tension inside the dryer into a quantifiable and queryable mapping relationship based on the Kutta number. The mapping relationship can be established through experiments in one go, and subsequent calculations can be quickly solved by simply substituting the input parameters, without the need to repeat on-site experiments. This meets the rapid evaluation requirements of newly designed steam generators (with different flow areas and different steam loads) and significantly improves the overall humidity calculation efficiency.

[0091] In some embodiments, step S400 may include, but is not limited to, steps S410 to S430: Step S410: Obtain the pressure loss when steam flows through the flow restrictor; Step S420: Based on the outlet steam humidity of the dryer and the pressure loss, the enthalpy value of the wet steam at the outlet of the flow restrictor is obtained by establishing an inlet and outlet energy balance equation. Step S430: Obtain the outlet steam humidity of the steam generator based on the wet steam enthalpy value.

[0092] In this embodiment, the geometric parameters of the flow restrictor (including the cross-sectional area before and after the flow restrictor and the height difference between the front and rear sections), the operating parameters of the flow restrictor inlet (including steam pressure, steam flow rate, and humidity), and the pressure loss coefficient of the flow restrictor are obtained. Using Bernoulli's equation and the above parameters, the pressure loss of steam flowing through the flow restrictor is determined, and the outlet pressure and outlet steam velocity after the flow restrictor are calculated accordingly.

[0093] Based on the outlet steam humidity of the dryer and the pressure loss and outlet state parameters obtained in the above steps, an energy balance equation for the inlet and outlet of the flow restrictor is established. First, based on the pressure and humidity before the flow restrictor inlet, the enthalpy and corresponding kinetic energy of the inlet wet steam are determined by consulting a steam property table. Second, according to the law of conservation of energy, the total energy at the flow restrictor inlet (the sum of inlet enthalpy and inlet kinetic energy) should be equal to the total energy at the flow restrictor outlet (the sum of outlet enthalpy and outlet kinetic energy). Given the outlet pressure and outlet steam velocity after the flow restrictor (i.e., the known outlet kinetic energy), the enthalpy of the wet steam at the flow restrictor outlet can be calculated by solving this energy balance equation. In this process, the steam condensation effect that may result from steam acceleration and pressure reduction needs to be considered.

[0094] After obtaining the enthalpy of wet steam at the outlet of the flow restrictor, the final steam humidity is calculated based on the pressure parameters at that location. According to the outlet pressure after the flow restrictor, the enthalpy of saturated water and the enthalpy of dry steam at that pressure are obtained from a steam-water property table. Using the thermodynamic properties of wet steam, a relationship between the enthalpy of wet steam and its dryness (or humidity) is established. By substituting the calculated outlet wet steam enthalpy with the enthalpy of saturated water and the enthalpy of dry steam obtained from the table into the calculation, the final outlet steam humidity of the steam generator can be obtained.

[0095] This embodiment uses the principle of thermodynamic energy conservation to quantify the impact of the easily overlooked detail of the flow restrictor's throttling process on the final steam humidity, ensuring the physical completeness of the entire calculation method and the high accuracy of the results.

[0096] In some embodiments, step S410 may include, but is not limited to, the following steps: The first pressure loss caused by friction when steam flows through the flow restrictor is obtained; To obtain the second pressure loss caused by the acceleration of steam in the flow restrictor; The pressure loss is obtained based on the first pressure loss and the second pressure loss.

[0097] In this embodiment, the first pressure loss refers to the irreversible pressure loss caused by friction between the fluid and the pipe wall, as well as eddies generated by abrupt changes in the flow channel shape (such as contraction or expansion), when steam flows through the flow restrictor; this is the resistance loss in the conventional sense. During calculation, the resistance characteristic parameters of the flow restrictor, such as the pressure loss coefficient, are obtained. Combined with fluid parameters such as the steam velocity and density at the flow restrictor inlet, the first pressure loss caused by friction and local resistance is calculated using fluid dynamics formulas.

[0098] The second pressure loss refers to the decrease in static pressure caused by the acceleration of steam within the flow restrictor. According to Bernoulli's principle, as steam flows through the throat of the flow restrictor, the flow cross-sectional area decreases, the flow velocity increases, leading to an increase in kinetic energy and a corresponding decrease in static pressure. In calculations, based on the geometric parameters of the flow restrictor's inlet and throat cross-sectional areas, combined with the inlet steam velocity and the expansion characteristics of the compressible fluid, the amount of static pressure reduction caused by the significant increase in velocity is calculated; this is the second pressure loss.

[0099] The first and second pressure losses calculated above are superimposed to obtain the total pressure loss of steam flowing through the flow restrictor. The total pressure loss comprehensively reflects the effects of resistance and acceleration on steam pressure. Subsequently, applying the total pressure loss to Bernoulli's equation, combined with the height difference before and after the flow restrictor and operating parameters, the outlet pressure and outlet steam velocity after the flow restrictor can be accurately solved, providing accurate basic data for subsequent calculations of wet steam enthalpy and humidity based on the energy balance equation.

[0100] This embodiment breaks down the total pressure loss into friction loss and acceleration loss, which correspond to the fluid viscosity effect and kinetic energy conversion process, respectively. This clarifies the contribution of different factors to the pressure loss, and the calculation logic is more in line with the actual flow law.

[0101] In some embodiments, step S430 may include, but is not limited to, the following steps: Obtain the inlet pressure of the current limiter; The outlet pressure of the flow limiter is obtained based on the inlet pressure and the pressure loss of the flow limiter. Obtain the enthalpy of dry steam and the enthalpy of saturated water at the outlet pressure of the flow restrictor; The outlet steam humidity of the steam generator is calculated based on the wet steam enthalpy, the dry steam enthalpy, and the saturated water enthalpy.

[0102] In this embodiment, the pressure parameters of the steam before it flows through the flow restrictor are obtained, namely the inlet pressure of the flow restrictor. The inlet pressure of the flow restrictor can typically be directly taken as the steam pressure at the dryer outlet, which can be calculated using steady-state thermal-hydraulic calculation software for the steam generator. The outlet pressure of the flow restrictor is obtained by subtracting the total pressure loss when the steam flows through the flow restrictor from the inlet pressure. The outlet pressure of the flow restrictor is the steam pressure at the outlet connection of the steam generator.

[0103] Based on the calculated outlet pressure of the flow restrictor, consult the thermodynamic property table of water and steam to obtain the corresponding saturated state physical properties at that pressure. Specifically, this includes the enthalpy of dry saturated steam and the enthalpy of saturated water at that pressure. These two parameters represent the specific enthalpy values ​​of completely dry steam and completely saturated water at that pressure, respectively.

[0104] The final steam humidity is calculated using the parameters mentioned above. Given the enthalpy of the wet steam at the flow restrictor outlet calculated using the energy balance equation, and combining this with the enthalpy of dry steam and saturated water obtained from tables, the humidity of the final steam outlet from the steam generator can be calculated using the thermodynamic properties of the wet steam.

[0105] This embodiment derives the humidity formula based on the enthalpy composition principle of saturated wet steam, rather than relying on empirical estimation. It has sufficient theoretical support, and the calculation results are more in line with actual physical laws and have higher accuracy. It constructs a complete calculation chain from measurable or calculable macroscopic parameters (pressure, loss) to microscopic physical property parameters (enthalpy), and then to the final engineering target parameter (humidity). Through physical property table lookup and linear interpolation, it can adapt to the changes in operating conditions under different outlet pressures. There is no need to rebuild the calculation model for different pressures. It has strong versatility and meets the humidity calculation needs of steam generators under different operating loads.

[0106] This application's embodiments utilize three-dimensional modeling by considering the uneven distribution of the three-dimensional flow field on the secondary side, and introduce Froude number and Kutta number to establish a single functional relationship between the separation performance of the steam-water separator and the dimensionless coefficient. This overcomes the shortcomings of existing technologies that rely on expensive field tests or inaccurate one-dimensional calculations. This allows for the rapid and accurate calculation of the outlet steam humidity under different operating conditions and design scales for new steam generators using the same type of steam-water separator and dryer, without the need for repeated field tests. This effectively improves design efficiency and provides sufficient evaluation basis for the improved design and safe operation of steam generators.

[0107] Please see Figure 5 This application also provides a steam humidity calculation device 500, applied to a steam generator. The steam generator includes a steam-water separator, a dryer, and a flow restrictor. Steam flows sequentially through the steam-water separator, the dryer, and the flow restrictor, enabling the above-mentioned steam humidity calculation method. The device includes: Acquisition module 10 is used to acquire the inlet steam parameters of the steam-water separator; The first calculation module 20 is used to obtain the outlet steam humidity of the steam-water separator based on the inlet steam parameters and the Froude number of the steam-water separator. The Froude number represents the relative magnitude of inertia and gravity in fluid motion. The second calculation module 30 is used to obtain the outlet steam humidity of the dryer based on the outlet steam humidity of the steam-water separator and the number of Kutau tubes of the dryer. The number of Kutau tubes represents the relative magnitude of inertia and gravity and fluid surface tension in fluid motion. The third calculation module 40 is used to obtain the outlet steam humidity of the steam generator based on the outlet steam humidity of the dryer and the pressure loss when the steam flows through the flow restrictor.

[0108] In some implementations, the acquisition module 10 may include: The first acquisition submodule is used to acquire the structural parameters and operating parameters of the steam generator; The first modeling submodule is used to model according to the structural parameters to obtain a three-dimensional model, which includes the secondary side tube bundle area of ​​the steam generator and the steam-water separator. The second modeling submodule is used to establish calculation equations based on the three-dimensional model. These calculation equations are used to calculate the three-dimensional steady-state thermal-hydraulic properties of the secondary side of the steam generator. The three-dimensional steady-state thermal-hydraulic calculation equations include the secondary side tube bundle region flow resistance equation, the primary side flow heat transfer equation, the secondary side flow heat transfer equation, and the steam-water separator flow resistance equation. Specifically, the secondary side tube bundle region flow resistance equation is used to calculate the resistance of the flow path in the secondary side tube bundle region; the primary side flow heat transfer equation is used to calculate the primary side flow heat transfer coefficient; the secondary side flow heat transfer equation is used to calculate the secondary side flow heat transfer coefficient; and the steam-water separator flow resistance equation is used to calculate the resistance of the separator. The first calculation submodule is used to input the operating parameters of the steam generator into the three-dimensional steady-state thermal-hydraulic calculation equation for calculation, so as to obtain the inlet steam parameters of the steam-water separator.

[0109] In some implementations, the second modeling submodule may include: The first addition unit is used to add the flow resistance of the secondary side tube bundle region to the secondary side momentum equation of the steam generator. The second addition unit is used to add the secondary-side flow heat transfer equation to the secondary-side energy equation of the steam generator. The secondary-side flow heat transfer equation includes a single-phase flow heat transfer equation, a subcooled boiling heat transfer equation, and a saturated boiling flow heat transfer equation. The single-phase flow heat transfer equation is used to calculate the heat transfer coefficient of single-phase flow heat transfer during the secondary-side heat transfer process. The subcooled boiling heat transfer equation is used to calculate the heat transfer coefficient of subcooled boiling heat transfer during the secondary-side heat transfer process. The saturated boiling heat transfer equation is used to calculate the heat transfer coefficient of saturated boiling heat transfer during the secondary-side heat transfer process. The third addition unit is used to add the primary heat exchange equation to the primary energy equation of the steam generator; The correlation unit is used to correlate the parameters in the quadratic mass equation, the quadratic energy equation, and the quadratic momentum equation through the drift flow equation to obtain the correlation equation; The modeling unit is used to establish the calculation equation based on the correlation equation and the primary energy equation. The drift flow equation is used to describe the drift motion law of the vapor phase relative to the average velocity of the vapor-water mixture in the two-phase flow.

[0110] In some implementations, the first computing module 20 may include: The second acquisition submodule is used to acquire the height difference between the top of the steam-water separator and the water level. The second calculation submodule is used to determine the Froude number corresponding to the steam-water separator based on the steam velocity in the inlet steam parameters of the steam-water separator and the height difference between the top of the steam-water separator and the water level. The third calculation submodule is used to obtain the invalid separation coefficient corresponding to the Froude number according to the preset mapping relationship between the Froude number and the invalid separation coefficient. The invalid separation coefficient is used to characterize the ratio of the outlet steam humidity to the inlet steam humidity of the steam-water separator. The fourth calculation submodule is used to obtain the outlet steam humidity of the steam-water separator based on the inlet steam parameters and the ineffective separation coefficient.

[0111] In some implementations, the mapping relationship between the Froude number and the invalid separation coefficient is obtained as follows: A hot performance test was conducted on the steam-water separator to obtain the Froude number, inlet steam humidity and outlet steam humidity of the steam-water separator under multiple first operating conditions. The multiple first operating conditions include multiple steam velocities, multiple steam pressures and multiple water level heights corresponding to the inlet of the steam-water separator. For each operating condition, the corresponding ineffective separation coefficient is calculated based on the inlet steam humidity and the outlet steam humidity. Pair the Froude number corresponding to each working condition with the invalid separation coefficient to obtain the mapping relationship between the Froude number and the invalid separation coefficient.

[0112] In some implementations, the second computing module 30 may include: The third acquisition submodule is used to acquire the inlet steam velocity and liquid surface tension of the dryer; The fifth calculation submodule is used to determine the number of Kutta corresponding to the dryer based on the inlet steam velocity of the dryer and the surface tension of the liquid; The sixth calculation submodule is used to obtain the outlet steam humidity of the dryer corresponding to the preset Kuttan number based on the mapping relationship between the Kuttan number and the outlet steam humidity of the dryer.

[0113] In some embodiments, the mapping relationship between the Kutta number and the outlet steam humidity of the dryer is obtained as follows: A hot-state performance test was conducted on the dryer to obtain the number of Kuts and the outlet steam humidity of the dryer under multiple second operating conditions. The multiple second operating conditions included multiple inlet steam velocities and multiple steam pressures of the dryer. By pairing the number of Kuttan tubes corresponding to each operating condition with the outlet steam humidity of the dryer, a mapping relationship between the number of Kuttan tubes and the outlet steam humidity of the dryer is obtained. In some implementations, the third computing module 40 may include: The fourth acquisition submodule is used to acquire the pressure loss when steam flows through the flow restrictor; The seventh calculation submodule is used to obtain the wet steam enthalpy value at the outlet of the flow restrictor by establishing an inlet and outlet energy balance equation based on the outlet steam humidity of the dryer and the pressure loss. The eighth calculation submodule is used to obtain the outlet steam humidity of the steam generator based on the wet steam enthalpy value.

[0114] In some implementations, the fourth acquisition submodule may include: The first acquisition unit is used to acquire the first pressure loss caused by friction when steam flows through the flow limiter; The second acquisition unit is used to acquire the second pressure loss caused by the acceleration of steam in the flow restrictor; The first calculation unit is used to obtain the pressure loss based on the first pressure loss and the second pressure loss.

[0115] In some implementations, the eighth computing submodule may include: The third acquisition unit is used to acquire the inlet pressure of the flow limiter; The second calculation unit is used to obtain the outlet pressure of the flow limiter based on the inlet pressure of the flow limiter and the pressure loss of the flow limiter. The fourth acquisition unit is used to acquire the enthalpy of dry steam and the enthalpy of saturated water corresponding to the outlet pressure of the flow restrictor; The third calculation unit calculates the outlet steam humidity of the steam generator based on the wet steam enthalpy, the dry steam enthalpy, and the saturated water enthalpy.

[0116] This application also provides an electronic device, which includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the above-described steam humidity calculation method. This electronic device can be any smart terminal, including tablet computers, in-vehicle computers, etc.

[0117] Please see Figure 6 , Figure 6 The hardware structure of an electronic device according to another embodiment is illustrated. The electronic device includes: The processor 701 can be implemented using a general-purpose CPU (Central Processing Unit), microprocessor, 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 this application. The memory 702 can be implemented as a read-only memory (ROM), a static storage device, a dynamic storage device, or a random access memory (RAM). The memory 702 can store the operating system and other application programs. When the technical solutions provided in the embodiments of this specification are implemented through software or firmware, the relevant program code is stored in the memory 702 and is called and executed by the processor 701 using the steam humidity calculation method of the embodiments of this application. The input / output interface 703 is used to implement information input and output; The communication interface 704 is used to enable communication and interaction between this device and other devices. Communication can be achieved through wired means (such as USB, Ethernet cable, etc.) or wireless means (such as mobile network, WIFI, Bluetooth, etc.). Bus 705 transmits information between various components of the device (e.g., processor 701, memory 702, input / output interface 703, and communication interface 704); The processor 701, memory 702, input / output interface 703, and communication interface 704 are connected to each other within the device via bus 705.

[0118] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described steam humidity calculation method.

[0119] Memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. Furthermore, memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, memory may optionally include memory remotely located relative to the processor, and these remote memories can be connected to the processor via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0120] The steam humidity calculation method, steam humidity calculation device, electronic equipment, and storage medium provided in this application's embodiments acquire the inlet steam parameters of the steam-water separator, calculate the outlet humidity of the steam-water separator using the Froude number, which characterizes the relative magnitude of inertia and gravity, and then calculate the outlet humidity of the dryer using the Kutta number, which characterizes the relative magnitude of inertial force, gravity, and surface tension. Finally, the final outlet steam humidity of the steam generator is determined based on the pressure loss of the flow restrictor and the energy equation. This application establishes a single functional relationship between the performance and parameters of the separation equipment by introducing the Froude number and the Kutta number, and considers the impact of uneven flow distribution by combining three-dimensional modeling. Therefore, it can quickly and accurately evaluate the outlet steam humidity without conducting on-site tests for new steam generator models, saving testing costs and providing a basis for design and safe operation.

[0121] The embodiments described in this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided by the embodiments of this application. As those skilled in the art will know, with the evolution of technology and the emergence of new application scenarios, the technical solutions provided by the embodiments of this application are also applicable to similar technical problems.

[0122] Those skilled in the art will understand that the technical solutions shown in the figures do not constitute a limitation on the embodiments of this application, and may include more or fewer steps than shown, or combine certain steps, or different steps.

[0123] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0124] Those skilled in the art will understand that all or some of the steps in the methods disclosed above, as well as the functional modules / units in the systems and devices, can be implemented as software, firmware, hardware, or suitable combinations thereof.

[0125] The terms “first,” “second,” “third,” “fourth,” etc. (if present) in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms “comprising” and “having,” and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0126] It should be understood that in this application, "at least one (item)" means one or more, and "more than" means two or more. "And / or" is used to describe the relationship between related objects, indicating that three relationships can exist. For example, "A and / or B" can represent three cases: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one (item) of a, b, or c can represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, and c can be single or multiple.

[0127] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of the units described above is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0128] The units described above as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0129] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0130] If the integrated unit is implemented as 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 this application, in essence, 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. This computer software product is stored in a storage medium and includes multiple instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing programs, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0131] The preferred embodiments of the present application have been described above with reference to the accompanying drawings, but this does not limit the scope of the claims of the present application. Any modifications, equivalent substitutions, and improvements made by those skilled in the art without departing from the scope and substance of the embodiments of the present application shall be within the scope of the claims of the present application.

Claims

1. A method for calculating steam humidity, characterized in that, The method is applied to a steam generator, which includes a steam-water separator, a dryer, and a flow restrictor, wherein steam flows sequentially through the steam-water separator, the dryer, and the flow restrictor. Obtain the inlet steam parameters of the steam-water separator; The outlet steam humidity of the steam separator is obtained based on the inlet steam parameters and the Froude number of the steam separator. The Froude number characterizes the relative magnitude of inertia and gravity in fluid motion. The outlet steam humidity of the dryer is obtained based on the outlet steam humidity of the steam-water separator and the Kutau number of the dryer. The Kutau number represents the relative magnitudes of inertia and gravity and fluid surface tension during fluid motion. The outlet steam humidity of the steam generator is obtained based on the outlet steam humidity of the dryer and the pressure loss when the steam flows through the flow restrictor.

2. The method according to claim 1, characterized in that, The process of obtaining the inlet steam parameters of the steam-water separator includes: Obtain the structural and operating parameters of the steam generator; A three-dimensional model is obtained by modeling based on the structural parameters. The three-dimensional model includes the secondary side tube bundle area of ​​the steam generator and the steam-water separator. Based on the three-dimensional model, calculation equations are established to calculate the three-dimensional steady-state thermal-hydraulic properties of the secondary side of the steam generator. These equations include the secondary-side tube bundle region flow resistance equation, the primary-side flow heat transfer equation, the secondary-side flow heat transfer equation, and the steam-water separator flow resistance equation. Specifically, the secondary-side tube bundle region flow resistance equation is used to calculate the resistance of the flow path in the secondary-side tube bundle region; the primary-side flow heat transfer equation is used to calculate the primary-side flow heat transfer coefficient; the secondary-side flow heat transfer equation is used to calculate the secondary-side flow heat transfer coefficient; and the steam-water separator flow resistance equation is used to calculate the resistance of the separator. The operating parameters of the steam generator are input into the three-dimensional steady-state thermal-hydraulic calculation equation for calculation to obtain the inlet steam parameters of the steam-water separator.

3. The method according to claim 2, characterized in that, The step of establishing calculation equations based on the three-dimensional model includes: The flow resistance in the secondary side tube bundle region is added to the secondary side momentum equation of the steam generator. The secondary-side flow heat transfer equation is added to the secondary-side energy equation of the steam generator; Add the primary-side heat transfer equation to the primary-side energy equation of the steam generator; The secondary-side flow heat transfer equation includes a single-phase flow heat transfer equation, a subcooled boiling heat transfer equation, and a saturated boiling flow heat transfer equation. The single-phase flow heat transfer equation is used to calculate the heat transfer coefficient of single-phase flow heat transfer during the secondary-side heat transfer process. The subcooled boiling heat transfer equation is used to calculate the heat transfer coefficient of subcooled boiling heat transfer during the secondary-side heat transfer process. The saturated boiling heat transfer equation is used to calculate the heat transfer coefficient of saturated boiling heat transfer during the secondary-side heat transfer process. By correlating the parameters in the quadratic mass equation, the quadratic energy equation, and the quadratic momentum equation using the drift flow equation, a correlation equation is obtained. The calculation equation is established based on the correlation equation and the primary energy equation. The drift flow equation is used to describe the drift motion law of the vapor phase relative to the average velocity of the vapor-water mixture in the two-phase flow.

4. The method according to claim 1, characterized in that, The step of obtaining the outlet steam humidity of the steam-water separator based on the inlet steam parameters and the Froude number of the steam-water separator includes: Obtain the height difference between the top of the steam-water separator and the water level; The Froude number corresponding to the steam-water separator is determined based on the steam velocity in the inlet steam parameters and the height difference between the top of the steam-water separator and the water level. Based on the preset mapping relationship between the Froude number and the ineffective separation coefficient, the ineffective separation coefficient corresponding to the Froude number is obtained. The ineffective separation coefficient is used to characterize the ratio of the outlet steam humidity to the inlet steam humidity of the steam-water separator. The outlet steam humidity of the steam separator is obtained based on the inlet steam parameters and the ineffective separation coefficient.

5. The method according to claim 4, characterized in that, The mapping relationship between the Froude number and the invalid separation coefficient is obtained as follows: A hot performance test was conducted on the steam-water separator to obtain the Froude number, inlet steam humidity and outlet steam humidity of the steam-water separator under multiple first operating conditions. The multiple first operating conditions include multiple steam velocities, multiple steam pressures and multiple water level heights corresponding to the inlet of the steam-water separator. For each operating condition, the corresponding ineffective separation coefficient is calculated based on the inlet steam humidity and the outlet steam humidity. Pair the Froude number corresponding to each working condition with the invalid separation coefficient to obtain the mapping relationship between the Froude number and the invalid separation coefficient.

6. The method according to claim 1, characterized in that, The step of obtaining the outlet steam humidity of the dryer based on the outlet steam humidity of the steam-water separator and the number of tubes in the dryer includes: The inlet steam velocity and liquid surface tension of the dryer are obtained; The number of Kutta corresponding to the dryer is determined based on the inlet steam velocity of the dryer and the surface tension of the liquid; Based on the preset mapping relationship between the number of Kuttan tubes and the outlet steam humidity of the dryer, the outlet steam humidity of the dryer corresponding to the number of Kuttan tubes is obtained.

7. The method according to claim 6, characterized in that, The mapping relationship between the Kuta number and the outlet steam humidity of the dryer is obtained as follows: A hot-state performance test was conducted on the dryer to obtain the number of Kuts and the outlet steam humidity of the dryer under multiple second operating conditions. The multiple second operating conditions included multiple inlet steam velocities and multiple steam pressures of the dryer. By pairing the number of Kuttans corresponding to each operating condition with the outlet steam humidity of the dryer, a mapping relationship between the number of Kuttans and the outlet steam humidity of the dryer is obtained.

8. The method according to claim 1, characterized in that, The step of obtaining the outlet steam humidity of the steam generator based on the outlet steam humidity of the dryer and the pressure loss when the steam flows through the flow restrictor includes: Obtain the pressure loss of steam flowing through the flow restrictor; Based on the outlet steam humidity of the dryer and the pressure loss, the enthalpy of the wet steam at the outlet of the flow restrictor is obtained by establishing an inlet and outlet energy balance equation. The outlet steam humidity of the steam generator is obtained based on the enthalpy value of the wet steam.

9. The method according to claim 8, characterized in that, The acquisition of the pressure loss when steam flows through the flow restrictor includes: The first pressure loss caused by friction when steam flows through the flow restrictor is obtained; To obtain the second pressure loss caused by the acceleration of steam in the flow restrictor; The pressure loss is obtained based on the first pressure loss and the second pressure loss.

10. The method according to claim 8, characterized in that, The step of obtaining the outlet steam humidity of the steam generator based on the wet steam enthalpy value includes: Obtain the inlet pressure of the current limiter; The outlet pressure of the flow limiter is obtained based on the inlet pressure and the pressure loss of the flow limiter. Obtain the enthalpy of dry steam and the enthalpy of saturated water at the outlet pressure of the flow restrictor; The outlet steam humidity of the steam generator is calculated based on the wet steam enthalpy, the dry steam enthalpy, and the saturated water enthalpy.

11. A steam humidity calculation device, characterized in that, An apparatus applied to a steam generator, the steam generator comprising a steam-water separator, a dryer, and a flow restrictor, wherein steam flows sequentially through the steam-water separator, the dryer, and the flow restrictor, the apparatus comprising: The acquisition module is used to acquire the inlet steam parameters of the steam-water separator; The first calculation module is used to obtain the outlet steam humidity of the steam-water separator based on the inlet steam parameters and the Froude number of the steam-water separator. The Froude number represents the relative magnitude of inertia and gravity in fluid motion. The second calculation module is used to obtain the outlet steam humidity of the dryer based on the outlet steam humidity of the steam-water separator and the Kutau number of the dryer. The Kutau number represents the relative magnitude of inertia and gravity and fluid surface tension in fluid motion. The third calculation module is used to obtain the outlet steam humidity of the steam generator based on the outlet steam humidity of the dryer and the pressure loss when the steam flows through the flow restrictor.

12. An electronic device, characterized in that, The electronic device includes a memory and a processor. The memory stores a computer program, and the processor executes the computer program to implement the steam humidity calculation method according to any one of claims 1 to 10.

13. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steam humidity calculation method according to any one of claims 1 to 10.

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