A method and device for calculating the amount of condensation on the surface of power transmission equipment in a hot and humid marine environment

Abstract

The application discloses a kind of wet and hot marine environment under power transmission equipment surface condensation amount calculation method and device, it is related to power transmission equipment humidity management technical field, wherein method includes: obtaining the temperature and relative humidity parameters of the environment where target power transmission equipment is located, into salt moisture dissociation corrected condensation generation condition criterion, whether to meet condensation generation condition is judged, not meet then terminate calculation, meet then enter subsequent process;Based on salt moisture dissociation effect, through the surface tension of salt solution and equivalent curvature radius double correction, construct condensation amount calculation equation, enter environmental parameter and obtain the condensation amount of moisture dissociation correction after solution;Combining the salt density deposition amount and contact angle change caused by wet and hot marine environment dry-wet alternation, based on the salt space redistribution characteristics complete salt density dynamic correction, into parameter calculation dry-wet cycle condensation amount, realize the quantification of equipment surface condensation amount.The application realizes the accurate calculation of condensation amount, while guaranteeing long-term service of marine power transmission equipment.

Description

Technical Field

[0001] This invention relates to the field of humidity management technology for power transmission equipment, and in particular to a method and apparatus for calculating condensation on the surface of power transmission equipment in a hot and humid marine environment. Background Technology

[0002] The hot and humid marine environment is characterized by high salt spray, high humidity, and frequent temperature fluctuations. Salt particles in this environment easily deposit on the surface of power transmission equipment, and together with humid air, they cause condensation, leading to decreased equipment insulation performance, corrosion of metal components, and even serious faults such as partial discharge and short circuits, posing a serious threat to the safe and stable operation of the power system. Taking the switchgear of an island substation as an example, even with dehumidification equipment, the indoor humidity often approaches or exceeds the critical threshold. The superposition of salt adhesion and condensation leads to salt accumulation on the surface of insulation sleeves and frequent partial discharges in the busbar compartment, significantly increasing equipment operation and maintenance costs and the risk of power outages.

[0003] Currently, most methods for calculating condensation on power transmission equipment are based on dew point temperature models for conventional environments. These methods estimate the critical conditions and amount of condensation by collecting environmental temperature and humidity parameters, and these technologies have been successfully applied in ordinary terrestrial environments. However, in hot and humid marine environments, the deliquescence effect significantly reduces the critical relative humidity for condensation, altering the formation mechanism and development pattern of condensation. Existing calculation methods do not incorporate the impact of deliquescence on water vapor adsorption and phase change processes, nor do they include key parameters such as salt deposition and salt composition. This results in significant errors in the calculations of condensation in marine environments, failing to accurately reflect the actual condensation state on the equipment surface.

[0004] This calculation error directly leads to a lack of scientific basis in the anti-condensation design of power transmission equipment. Protective measures often fail due to underestimating the amount of condensation, or cause cost waste due to over-design. At the same time, it is difficult to guide operation and maintenance personnel to formulate accurate dehumidification and anti-salt operation and maintenance strategies, resulting in consistently low reliability of equipment operation in high-salt and high-humidity environments.

[0005] In summary, there is an urgent need to establish a method for calculating condensation that takes into account the deliquescence effect of salt, so as to make up for the shortcomings of existing technologies in the applicability of hot and humid marine environments and provide strong technical support for the optimized design and safe operation and maintenance of power transmission equipment in such environments. Summary of the Invention

[0006] The main objective of this invention is to provide a method for calculating the condensation on the surface of power transmission equipment in a hot and humid marine environment.

[0007] Another objective of this invention is to provide a device for calculating the condensation on the surface of power transmission equipment in a hot and humid marine environment.

[0008] The third objective of this invention is to provide an electronic device.

[0009] A fourth objective of this invention is to provide a non-transitory computer-readable storage medium.

[0010] To achieve the above objectives, a first aspect of the present invention provides a method for calculating the condensation on the surface of power transmission equipment in a hot and humid marine environment, comprising:

[0011] S1. Obtain the ambient temperature and relative humidity parameters of the target power transmission equipment. Substitute them into the condensation formation condition criterion after salt deliquescence correction to determine whether the condensation formation condition is met. If not, terminate the calculation. If it is met, proceed to the next step. S2, based on the mechanism of salt deliquescence effect, by correcting the surface tension of salt solution and the equivalent radius of curvature, a calculation equation for the amount of condensation after salt deliquescence correction is constructed. By substituting environmental parameters into the equation, the amount of condensation on the equipment surface after salt deliquescence correction is obtained. S3 combines the changes in salt density deposition and wetting contact angle caused by the alternating dry and wet conditions on the surface of equipment in a hot and humid marine environment. Based on the spatial redistribution characteristics of salt, the amount of condensation during the dry-wet cycle is calculated by substituting temperature and humidity parameters after dynamic correction of salt density. This completes the quantitative calculation of condensation on the surface of power transmission equipment in a hot and humid marine environment.

[0012] Optionally, the condensation formation criterion after salt deliquescence correction further includes: Based on the classic Magnus-Tetens formula, a modified version is given. The classic Magnus-Tetens expression is as follows: ; Introduce a dew point correction value that is positively correlated with salt concentration. , To construct the actual dew point calculation relationship when salt is present, based on the solid surface temperature of the equipment. The temperature below the actual dew point is used as the thermodynamic criterion for condensation to occur, and its expression is as follows:

[0013] in, The solid surface temperature Here, is the dew point temperature, parameters A and B are constants, T is the ambient temperature, and RH is the relative humidity. Let be the mass fraction of salt, and k be the characteristic constant of salt.

[0014] Optionally, the theoretical support system for the condensation formation condition criterion after salt deliquescence correction includes the derivation logic of the calculation equation for condensation in a pure water vapor environment. The calculation equation for condensation in a pure water vapor environment is derived based on the Kelvin equation, and the expression of the Kelvin equation is:

[0015] The derivation process incorporates the coupling relationship between water vapor molecule diffusion flux and the volume growth rate of a single droplet. Through a series of steps including Kelvin equation approximation, logarithmic Taylor expansion, discarding higher-order terms, equation integration, and parameter simplification, the final expression for the calculation equation of condensation in a pure water vapor environment is obtained as follows:

[0016] Where P is the actual vapor pressure. For flat surface vapor pressure, For liquid-gas interfacial tension, Let be the molar volume of the liquid, r be the radius of curvature of the droplet, R be the gas constant, and V be the volume of the droplet per unit area. These are the comprehensive parameter constants.

[0017] Optionally, the process of correcting the surface tension of the salt solution also includes: Based on the equation for calculating condensation in a pure water vapor environment, an empirical relationship between the surface tension of a salt solution and its concentration is introduced. Establish salt density sedimentation Directly proportional to salt concentration Substituting empirical relationships, we obtain the correlation between the surface tension of the salt solution and the amount of salt deposited. ; Solving for liquid-gas interfacial tension using the Neumann equation The Neumann equation is approximated by the Taylor expansion. Substituting the equation into the equation for calculating condensation in a pure water atmosphere, the equation is simplified to obtain an intermediate equation containing a surface tension correction term. ,in The solid-gas interfacial tension is given by θ, where θ is the contact angle of pure water. , , , Let V be a constant and V be the amount of condensation. Let be the partial pressure of water vapor at temperature T, r be the radius of curvature of the droplet, and RH be the relative humidity.

[0018] Optionally, the basis for the formation and quantification of salinity spatial redistribution characteristics also includes: In a hot and humid marine environment, the alternating wet and dry cycles on the equipment surface cause changes in the amount of salt deposited. The core driving mechanism is the coffee ring effect, which causes the condensation morphology to gradually change from a droplet spreading state to a ring-shaped condensation, thereby inducing the spatial redistribution of salt on the equipment surface. When deriving the correction relationship of salt density deposition after spatial redistribution of salt, the core conservation principle is that the total amount of salt remains unchanged before and after the wet-dry cycle, which provides the core basis for the derivation of the correction relationship.

[0019] Optionally, the derivation of the correction relationship for salt density deposition after salt redistribution also includes: Based on the principle of conservation of total salt content, the following relationship is constructed:

[0020] in, This represents the amount of salt density deposited before the wet-dry cycle. This represents the amount of salt density deposited after salt redistribution. The droplet spreading radius before the wet-dry cycle. The droplet spreading radius after the wet-dry cycle; By simplifying the conservation equations, the expression for the amount of salt density deposited after salt redistribution is obtained as follows: .

[0021] Optionally, the construction of the equation for calculating condensation after the wet-dry cycle correction also includes: Substitute the expression for salt density deposition after salt redistribution into the equation for calculating condensation after salt deliquescence correction. By replacing the water vapor partial pressure term in the Tetens formula, the final equation for calculating condensation after the wet-dry cycle correction is as follows: .

[0022] To achieve the above objectives, a second aspect of the present invention provides a device for calculating the condensation on the surface of power transmission equipment in a hot and humid marine environment, comprising: The condensation determination module is used to obtain the spatial temperature and relative humidity parameters of the environment where the power transmission equipment to be predicted is located, and substitute them into the condensation formation condition criterion after salt deliquescence correction to determine whether the condensation formation condition is met. If it is not met, the calculation is terminated; if it is met, the subsequent steps are entered. The deliquescence correction module is used to construct a calculation equation for condensation amount after salt deliquescence correction by correcting the surface tension of the salt solution and the equivalent radius of curvature. By substituting environmental parameters into the equation, the condensation amount on the equipment surface after salt deliquescence correction can be obtained. The wet-dry correction module is used to combine the changes in salt density deposition and wetting contact angle caused by the alternating wet and dry conditions on the surface of equipment in a hot and humid marine environment. Based on the spatial redistribution characteristics of salt, the module calculates the condensation amount of the wet-dry cycle after dynamic salt density correction and inputting temperature and humidity parameters, thus completing the quantitative calculation of condensation amount on the surface of power transmission equipment in a hot and humid marine environment.

[0023] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0024] To achieve the above objectives, a third aspect of this application provides an electronic device, including a processor and a memory; wherein the processor reads executable program code stored in the memory to run a program corresponding to the executable program code, for implementing a method for calculating the surface condensation of power transmission equipment in a humid and hot marine environment as described in the first aspect embodiment.

[0025] To achieve the above objectives, the fourth aspect of this application provides a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements a method for calculating the condensation on the surface of power transmission equipment in a humid and hot marine environment as described in the first aspect embodiment.

[0026] The embodiments of the present invention have the following beneficial effects: 1. The method for calculating condensation generation in this invention is designed for the characteristics of salt deliquescence in a humid marine environment. Based on the correction of the surface tension of the salt solution on the solid surface, the equivalent radius of curvature of the condensation droplets, and the changes in the amount of salt density deposited on the solid surface caused by the spatial redistribution of salt during the condensation wet-dry cycle, a professional mathematical equation is established to calculate the amount of condensation generation on the solid surface in a humid marine environment, thereby improving the accuracy of condensation behavior prediction.

[0027] 2. The method for calculating condensation generation of the present invention is of great significance in calculating and predicting the short-term condensation behavior caused by salt spray deposition on the surface of power transmission equipment in nearshore and offshore areas, as well as the condensation behavior during long-term wet-dry cycles, and in drawing condensation maps as a reference for economic development. Attached Figure Description

[0028] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 A flowchart illustrating a method for calculating condensation on the surface of power transmission equipment in a humid and hot marine environment, provided by an embodiment of the present invention; Figure 2 This is a flowchart illustrating the overall framework of a method for calculating condensation on the surface of power transmission equipment in a humid and hot marine environment, as provided in an embodiment of the present invention. Figure 3 This is a diagram showing the experimental results of spatial redistribution of salt during the condensation wet-dry cycle provided in an embodiment of the present invention. Figure 4 A schematic diagram illustrating the calculation process of salt spatial redistribution leading to changes in salt density deposition during the condensation wet-dry cycle provided in an embodiment of the present invention; Figure 5 A schematic diagram of the condensation process considering salt deliquescence and wet-dry cycles in a humid marine environment, provided by an embodiment of the present invention. Figure 6The ambient temperature / humidity curve provided for the embodiments of the present invention; Figure 7 This is a structural diagram of a device for calculating the condensation on the surface of power transmission equipment in a humid and hot marine environment, provided in an embodiment of the present invention. Detailed Implementation

[0029] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0031] The following describes, with reference to the accompanying drawings, a method and apparatus for calculating condensation on the surface of power transmission equipment in a humid and hot marine environment, according to an embodiment of the present invention.

[0032] Example 1 This invention provides a method for calculating condensation on the surface of power transmission equipment in a hot and humid marine environment. Figure 1 This is a flowchart illustrating a method for calculating condensation on the surface of power transmission equipment in a hot and humid marine environment, as provided in an embodiment of the present invention. Figure 2 This is a flowchart illustrating the overall framework of a method for calculating condensation on the surface of power transmission equipment in a hot and humid marine environment, as provided in an embodiment of the present invention. Figure 1 , Figure 2 As shown, the method includes the following steps: Step S1: Obtain the ambient temperature and relative humidity parameters of the target power transmission equipment's environment, substitute them into the condensation formation condition criterion corrected for salt deliquescence, and determine whether the condensation formation condition is met. If not, terminate the calculation; if so, proceed to the next step.

[0033] In this embodiment, the primary step in calculating condensation on the surface of power transmission equipment in a hot and humid marine environment is to collect and confirm core environmental parameters. Specifically, it is necessary to accurately acquire two key parameters: the ambient temperature (T) and relative humidity (RH) of the service environment where the target power transmission equipment operates. These two parameters are the core input data for the orderly progress of all subsequent condensation calculation processes, and their acquisition accuracy directly determines the reliability and accuracy of the final condensation calculation results. In practical engineering applications, these environmental parameters can be collected in real time and continuously by strategically deploying high-precision environmental monitoring sensors at key locations around the power transmission equipment. This ensures that the acquired data accurately and dynamically reflects the actual environmental conditions of the equipment, providing reliable data support for subsequent calculations.

[0034] After collecting environmental parameters, the next step is to determine the conditions for condensation formation based on these parameters. The core purpose of this step is to screen out scenarios with a risk of condensation, avoiding invalid calculations for situations where condensation is not possible, thereby improving the efficiency and relevance of the overall calculation process. Specifically, the spatial temperature T and relative humidity RH parameters collected above are substituted into the pre-constructed salt deliquescence-corrected condensation formation condition criterion. The calculation results of this criterion are then used to determine whether the surface of the target power transmission equipment possesses the thermodynamic conditions required for condensation formation.

[0035] It is important to note that the condensation formation criterion used in this application, after salt deliquescence correction, is derived from the classic Magnus-Tetens dew point calculation model, optimized and modified to suit the specific characteristics of a humid and hot marine environment. The classic Magnus-Tetens formula is the existing technology used to calculate dew point temperatures under normal salt-free conditions. The mature model is expressed in formula (1): (1) However, this classic model has significant limitations in applicability to hot and humid marine environments. The reason is that in such environments, a large number of suspended salt particles in the air easily deposit on the surface of power transmission equipment. These salt particles rapidly deliquesce in high humidity, forming salt solutions. These salt solutions indirectly increase the dew point temperature by lowering their vapor pressure, making condensation more likely than in conventional salt-free environments. If the classic Magnus-Tetens formula is still used to calculate the dew point temperature in this situation, the criteria will be distorted because the effect of salt deliquescence is not considered.

[0036] To address this core issue, this application proposes a targeted correction scheme, namely, introducing a dew point correction value ΔT determined by the salt concentration. This correction value satisfies the following relationship with the salt concentration: The approximate relationship, where, denoted as the mass fraction of salt, expressed in %; k is a salt characteristic constant, with different k values ​​corresponding to different types of salt. For example, NaCl, a common salt in humid and hot marine environments, has a k value of approximately 0.3℃ / .

[0037] From the perspective of basic thermodynamic principles, the core condition for condensation formation is that the solid surface temperature is lower than the ambient dew point temperature. Based on the aforementioned influence of salt deliquescence on dew point temperature, this application further derives and determines the thermodynamic condition that condensation formation must satisfy after salt deliquescence correction. The specific expression for this condition is shown in formula (2): (2) In the formula, The solid surface temperature of the power transmission equipment is represented in °C; parameters A and B are inherent constants of the Magnus-Tetens formula, with standard values ​​of A = 17.27 °C and B = 237.7 °C, respectively; T is the ambient temperature collected earlier, in °C; RH is the relative humidity collected earlier, in %; k is the salt characteristic constant. This represents the mass fraction of salt.

[0038] When making a specific determination based on the thermodynamic conditions expressed in formula (2), two cases need to be handled: First, if the solid surface temperature of the target power transmission equipment is calculated... Not less than the actual dew point temperature This indicates that the thermodynamic conditions for condensation formation are not met on the equipment surface at this time, and condensation will not occur subsequently. In this case, the entire condensation calculation process can be terminated directly; secondly, if the judgment result is... < This indicates that there is a possibility of condensation forming on the surface of the target power transmission equipment, which is a prerequisite for further calculation of condensation amount. At this point, it is necessary to proceed to the subsequent step of accurate calculation of condensation amount.

[0039] Step S2: Based on the mechanism of salt deliquescence effect, a calculation equation for condensation amount after salt deliquescence correction is constructed by correcting the surface tension of the salt solution and the equivalent radius of curvature. The environmental parameters are substituted into the equation to solve for the condensation amount on the equipment surface after salt deliquescence correction.

[0040] The salt deliquescence-corrected condensation calculation equation constructed in this application is not built entirely from scratch, but rather optimized and corrected based on the condensation calculation equation for a pure water vapor environment. It should be noted that the core basis for the derivation of this pure water vapor environment condensation calculation equation is the Kelvin equation. The derivation is completed by applying a series of reasonable approximations and simplifications to the Kelvin equation, and by combining relevant physical models such as water vapor diffusion flux and droplet growth rate.

[0041] Among them, the Kelvin equation is a classic equation that describes the quantitative relationship between vapor pressure and droplet curvature radius on a curved liquid surface. Its specific expression is shown in formula (3): (3) In the formula, each parameter is defined as follows: P is the actual vapor pressure (unit: Pa). Vapor pressure on a flat surface (unit: Pa). V is the interfacial tension between liquid and gas (unit: N / m). m R is the liquid molar volume (m³ / mol), r is the droplet radius of curvature (m), and R is the universal gas constant, with a standard value of 8.314 J / (mol·K).

[0042] In this embodiment, the condensation amount V is defined as the droplet volume per unit area of ​​the equipment surface. Its size is determined by the coupling of the diffusion flux of water vapor molecules to the equipment surface and the growth rate of the droplets themselves, which together dominate the formation and development process of condensation. The diffusion flux J of water vapor to the surface of the cryogenic equipment (i.e., the number of water vapor molecules passing through a unit area per unit time) can be calculated using formula (4): (4) In the formula, D is the water vapor diffusion coefficient. The concentration of water molecules at ambient temperature T. For the surface temperature of the equipment The concentration of water molecules, This refers to the diffusion boundary layer thickness (i.e., the thickness of the gas layer that water vapor needs to pass through during diffusion).

[0043] To derive the equation for calculating condensation in a pure water vapor environment, this application adopts a step-by-step approximation and simplification approach. The specific process is as follows: First, the Kelvin equation is reasonably approximated by replacing the actual vapor pressure P in the equation with the vapor pressure of a flat surface at different temperatures, resulting in formula (5); then, to simplify the calculation, the logarithmic term on the left side of formula (5) is approximated by Taylor expansion, resulting in formula (6). Subsequently, higher-order terms in the expansion are discarded, and the simplified vapor pressure difference relationship is finally obtained as shown in formula (7). (5) (6) (7).

[0044] Meanwhile, there is a clear quantitative relationship between the volume growth rate of a single droplet and the water vapor diffusion flux, as shown in formula (8); substituting the diffusion flux expression shown in formula (4) into formula (8), we can obtain the specific expression for the droplet volume growth rate, as shown in formula (9): (8) (9) In the formula, The volumetric growth rate of a single droplet. It represents the surface area of ​​the droplet in contact with the gas.

[0045] Subsequently, the vapor pressure difference relationship shown in formula (7) is substituted into the diffusion flux equation shown in formula (9), and the integral is performed over time to obtain formula (10); to further simplify the equation form, the relationship between molar volume and mass and density is introduced. (where M is the molar mass of the liquid,) Let (where is the liquid density), transform formula (10) to obtain formula (11), and then further simplify it algebraically to obtain formula (12); finally, let (where k1 is a constant coefficient introduced during the simplification process), substituting it into formula (12), the final calculation equation for condensation in pure water vapor environment is shown in formula (13): (10) (11) (12) (13).

[0046] It should be clarified that the above-derived equation for calculating condensation in a pure water vapor environment is applicable to conventional salt-free environments and does not consider the influence of salt deliquescence on condensation formation in humid marine environments. In humid marine environments, salt deliquescence significantly alters the formation mechanism and development pattern of condensation. If the equation for calculating condensation in a pure water vapor environment is directly used, the calculated result will deviate significantly from the actual condensation on the equipment surface, failing to meet the requirements for accurate calculation. Therefore, this embodiment of the application, targeting the salt deliquescence characteristics of humid marine environments, sequentially corrects the salt solution surface tension and the equivalent radius of curvature of the salt solution in the equation for calculating condensation in a pure water vapor environment shown in formula (13). Through these two targeted corrections, a salt deliquescence-corrected equation for calculating condensation suitable for humid marine environments is finally obtained.

[0047] In the salt solution surface tension correction process, the core correction logic is as follows: Salt deliquescence causes salt particles on the equipment surface to dissolve, forming a salt solution. As the salt continues to dissolve, the concentration of the salt solution gradually increases, and this increase in concentration directly affects the liquid-gas interfacial tension. Increased concentration affects the calculation results of condensation. Based on this, the embodiments of this application use an empirical formula to describe the relationship between the surface tension and concentration of the salt solution, as shown in formula (14); at the same time, considering that the salt density deposition amount (the salt mass per unit area of ​​the equipment surface) is directly related to the salt solution concentration, the salt density deposition amount is introduced. And define the direct proportional relationship between salt density deposition and solution concentration as follows: (in (where is a proportionality constant), substituting this proportional relationship into formula (14), we obtain the correlation between the surface tension of the salt solution and the amount of salt deposited, as shown in formula (15); substituting formula (15) into formula (13), we can complete the correction of the surface tension of the salt solution, and at this time, equation (13) is updated to formula (16): (14) (15) (16) In the formula, The liquid-gas interfacial tension of the salt solution. is the surface tension concentration coefficient of the salt solution.

[0048] To further refine the solution of formula (16) In this application embodiment, the Neumann equation (Equation (17)) is adopted. This equation is a classical equation describing the interfacial tension balance relationship of the solid, liquid, and gas three-phase interface, which can accurately reflect the relationship between interfacial tension and contact angle. When the material of the power transmission equipment is determined, the solid-gas interfacial tension is... Since the value is fixed, the Neumann equation is expanded using Taylor and approximated to obtain formula (18); substituting formula (18) into formula (16) and simplifying algebraically, formula (19) is obtained: (17) (18) (19) In the formula, θ is the contact angle of pure water on the surface of the equipment. , These are constant coefficients introduced during the simplification process.

[0049] In the correction step for the equivalent radius of curvature of the salt solution, the core correction logic is as follows: the salt solution formed by salt deliquescence will form a micro-liquid film on the equipment surface. This micro-liquid film will change the existence shape of the droplets, resulting in an increase in the equivalent radius of curvature r of the droplets. The radius of curvature is a key parameter affecting the calculation of condensation, so it needs to be corrected accordingly. This application's embodiment uses the core conservation principle of "the condensation volume remains unchanged before and after the contact angle change" to derive the correction for the equivalent radius of curvature: Let the contact angle of pure water on the equipment surface be θ, and the corresponding droplet radius of curvature be r. After salt deliquescence, the contact angle of the salt solution on the equipment surface becomes... The corresponding droplet radius of curvature becomes The volume conservation relationship between the two is shown in formula (20); the relationship between droplet height and radius of curvature and contact angle is expressed by formula (20). (where h is the droplet height) Substituting into formula (20), we get formula (21), and after algebraic simplification, we get the corrected formula for the equivalent radius of curvature as shown in formula (22): (20) (twenty one) (twenty two) Substituting the equivalent radius of curvature correction formula shown in formula (22) into formula (19), and after further algebraic simplification, we finally obtain formula (23), which is the calculation equation for condensation amount considering the salt deliquescence effect, that is, the salt deliquescence correction condensation amount calculation equation required in this application: (twenty three) In the formula, Let T be the partial pressure of water vapor in the air at temperature T (unit: kPa). Its specific value can be calculated using the Tetens formula, which is expressed as follows: ; The contact angle of the salt solution on the material surface after salt deliquescence. The solid-gas interfacial tension (unit: N / m). Salt density deposition (unit: salt mass per unit area).

[0050] Substitute the ambient temperature T and relative humidity RH parameters obtained in step S1, along with the specific values ​​of each parameter, into formula (23). By solving this equation, the amount of condensation on the equipment surface corrected for salt deliquescence can be obtained. This result can preliminarily reflect the influence of salt deliquescence on the amount of condensation in a humid and hot marine environment.

[0051] Step S3: Combining the changes in salt density deposition and wetting contact angle caused by the alternating dry and wet conditions on the equipment surface in a hot and humid marine environment, and based on the spatial redistribution characteristics of salt, the amount of condensation during the dry-wet cycle is calculated by substituting temperature and humidity parameters after dynamic correction of salt density, thus completing the quantitative calculation of condensation on the surface of power transmission equipment in a hot and humid marine environment.

[0052] In this embodiment, the core objective of step S3 is to further integrate the typical characteristics of a humid marine environment to accurately calculate the condensation amount after dry-wet cycle correction, ultimately achieving a comprehensive quantification of the condensation amount on the surface of power transmission equipment in this environment. Specifically, this step aims to combine the changes in salt density deposition and wetting contact angle caused by the alternating dry and wet processes on the equipment surface in a humid marine environment, conduct dynamic salt density correction based on the spatial redistribution characteristics of salt, and then substitute the ambient temperature and relative humidity parameters obtained in step S1 into the corrected equation to calculate the condensation amount during the dry-wet cycle, thereby completing the accurate quantification calculation of the condensation amount on the surface of power transmission equipment in a humid marine environment.

[0053] It is important to emphasize that the hot and humid marine environment is characterized by large diurnal temperature variations and frequent alternations between sunny and rainy weather. This directly leads to repeated cycles of condensation and evaporation on the surfaces of power transmission equipment. In this process, the core driving mechanism for the spatial redistribution of salinity is the coffee ring effect, such as... Figure 3 As shown, its working principle is as follows: When condensation droplets on the equipment surface evaporate, the evaporation rate at the edge of the droplet is much higher than that at the center. This difference in evaporation rate causes the solute, i.e., salt, within the droplet to migrate and deposit towards the edge. Ultimately, this causes the condensation to change from an initial spread-out state to a ring-shaped condensation, thereby inducing a significant spatial redistribution of salt on the equipment surface, resulting in a high salt density deposition. Changes have occurred. Salt density deposition is a key parameter affecting condensation calculations, therefore dynamic corrections must be made for this parameter.

[0054] Based on this, the embodiments of this application take "the total salt content remains unchanged before and after the wet-dry cycle" as the core conservation principle, and derive the correction relationship for salt density deposition, such as... Figure 4 As shown in the figure. The conservation relationship of the total salt content before and after the wet-dry cycle is shown in formula (24). The left side of the formula represents the total salt content in the droplet spreading area before the wet-dry cycle, and the right side represents the total salt content in the annular area after the wet-dry cycle. By performing algebraic transformation and simplification on formula (24), the amount of salt density deposited after salt redistribution can be derived. The expression is shown in formula (25): (twenty four) (25) In the formula, The radius of droplet spread before the condensation wet-dry cycle. The radius of droplet spread after the condensation undergoes a wet-dry cycle.

[0055] Subsequently, in this embodiment of the application, the salt density dynamic correction relationship shown in formula (25) is substituted into the salt deliquescence correction condensation calculation equation obtained in step S2, which is formula (23), and the corrected salt density deposition amount is used. Replace the salt density deposition amount in the original equation After further simplification, the equation for calculating condensation after the dry-wet cycle correction is shown in formula (26): (26).

[0056] In this embodiment of the application, when substituting parameters to perform calculations, , , , and The specific values ​​for key parameters can be selected by referring to Table 1. Table 1 shows the preset parameters and corresponding values ​​of the condensation calculation equation during the wet-dry cycle: Table 1

[0057] Substituting the spatial temperature T and relative humidity RH parameters obtained in step S1, along with the preset parameter values ​​in Table 1, into formula (26), the amount of condensation on the equipment surface after the wet-dry cycle can be obtained by solving this equation. This calculation result comprehensively considers the dual effects of salt deliquescence and wet-dry cycles, and can more realistically and accurately reflect the actual condensation state on the surface of power transmission equipment in a humid and hot marine environment, ultimately achieving accurate quantitative calculation of the amount of condensation on the surface of power transmission equipment in this environment.

[0058] In the application of one embodiment of the present invention, the implementation process is as follows: NaCl salt particles were deposited on a galvanized steel sheet with dimensions of 148mm × 68mm × 1mm. The galvanized steel sheet weighed 78.86g before deposition and 81.25g after deposition. The amount of salt deposited was calculated. =0.24kg / m 2 The deposited galvanized steel sheet was placed in a controlled humidity and heat environment chamber, with the ambient temperature T=40℃, the ambient relative humidity RH=95%, and the environmental exposure time 6 hours. Substituting into the condensation calculation equation (formula (26)), the condensation generation amount V=1.37ml was calculated. Figure 5 This is a schematic diagram of the condensation process considering salt deliquescence and wet-dry cycles in a humid marine environment, provided by an embodiment of the present invention. Figure 6 The ambient temperature / humidity curves provided for the embodiments of the present invention are as follows: Figure 5 , Figure 6 As shown.

[0059] Example 2 This invention provides a device for calculating the condensation on the surface of power transmission equipment in a hot and humid marine environment. Figure 7 This is a schematic flowchart of a device for calculating condensation on the surface of power transmission equipment in a hot and humid marine environment, provided in an embodiment of the present invention. Figure 7 As shown, the device includes: The condensation determination module 100 is used to obtain the spatial temperature and relative humidity parameters of the environment where the power transmission equipment to be predicted is located, substitute them into the condensation formation condition criterion after salt deliquescence correction, and determine whether the condensation formation condition is met. If it is not met, the calculation is terminated; if it is met, the subsequent steps are entered. The deliquescence correction module 200 is used to construct a calculation equation for the amount of condensation after salt deliquescence correction by correcting the surface tension of the salt solution and the equivalent radius of curvature. By substituting environmental parameters into the equation, the amount of condensation on the equipment surface after salt deliquescence correction can be obtained. The wet-dry correction module 300 is used to combine the changes in salt density deposition and wetting contact angle caused by the alternating wet and dry conditions on the surface of equipment in a hot and humid marine environment. Based on the spatial redistribution characteristics of salt, the module calculates the amount of condensation in the wet-dry cycle by inputting temperature and humidity parameters after dynamic correction of salt density, thus completing the quantitative calculation of condensation on the surface of power transmission equipment in a hot and humid marine environment.

[0060] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0061] Example 3 To implement the methods of the above embodiments, the present invention also provides an electronic device, which includes a memory and a processor; wherein the processor reads executable program code stored in the memory to run a program corresponding to the executable program code, so as to implement the various steps of the methods described above.

[0062] Example 4 To implement the above embodiments, this application also proposes a non-transitory computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the method described in the foregoing embodiments.

[0063] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0064] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0065] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

Claims

1. A method for calculating condensation on the surface of power transmission equipment in a hot and humid marine environment, characterized in that, include: S1. Obtain the ambient temperature and relative humidity parameters of the target power transmission equipment. Substitute them into the condensation formation condition criterion after salt deliquescence correction to determine whether the condensation formation condition is met. If not, terminate the calculation. If it is met, proceed to the next step. S2, based on the mechanism of salt deliquescence effect, by correcting the surface tension of salt solution and the equivalent radius of curvature, a calculation equation for the amount of condensation after salt deliquescence correction is constructed. By substituting environmental parameters into the equation, the amount of condensation on the equipment surface after salt deliquescence correction is obtained. S3 combines the changes in salt density deposition and wetting contact angle caused by the alternating dry and wet conditions on the surface of equipment in a hot and humid marine environment. Based on the spatial redistribution characteristics of salt, the amount of condensation during the dry-wet cycle is calculated by substituting temperature and humidity parameters after dynamic correction of salt density. This completes the quantitative calculation of condensation on the surface of power transmission equipment in a hot and humid marine environment.

2. The method according to claim 1, characterized in that, The condensation formation criterion after salt deliquescence correction also includes: Based on the classic Magnus-Tetens formula, a modified version is given. The classic Magnus-Tetens expression is as follows: ； Introduce a dew point correction value that is positively correlated with salt concentration. , To construct the actual dew point calculation relationship when salt is present, based on the solid surface temperature of the equipment. The temperature below the actual dew point is used as the thermodynamic criterion for condensation to occur, and its expression is as follows: in, The solid surface temperature Here, is the dew point temperature, parameters A and B are constants, T is the ambient temperature, and RH is the relative humidity. Let be the mass fraction of salt, and k be the characteristic constant of salt.

3. The method according to claim 2, characterized in that, The theoretical support system for the condensation formation criterion corrected for salinity deliquescence includes the derivation logic of the equation for calculating condensation in a pure water vapor environment. This equation is derived from the Kelvin equation, and its expression is: The derivation process incorporates the coupling relationship between water vapor molecule diffusion flux and the volume growth rate of a single droplet. Through a series of steps including Kelvin equation approximation, logarithmic Taylor expansion, discarding higher-order terms, equation integration, and parameter simplification, the final expression for the calculation equation of condensation in a pure water vapor environment is obtained as follows: Where P is the actual vapor pressure. For flat surface vapor pressure, For liquid-gas interfacial tension, Let be the molar volume of the liquid, r be the radius of curvature of the droplet, R be the gas constant, and V be the volume of the droplet per unit area. These are the comprehensive parameter constants.

4. The method according to claim 3, characterized in that, The process of correcting the surface tension of a salt solution also includes: Based on the equation for calculating condensation in a pure water vapor environment, an empirical relationship between the surface tension of a salt solution and the salt concentration is introduced. Establish salt density sedimentation Directly proportional to salt concentration Substituting empirical relationships, we obtain the correlation between the surface tension of the salt solution and the amount of salt deposited. ; Solving for liquid-gas interfacial tension using the Neumann equation The Neumann equation is approximated by the Taylor expansion. Substituting the equation into the equation for calculating condensation in a pure water atmosphere, the equation is simplified to obtain an intermediate equation containing a surface tension correction term. ,in The solid-gas interfacial tension is given, and θ is the contact angle of pure water. , , , Let V be a constant, and V be the amount of condensation. Let be the partial pressure of water vapor at temperature T, r be the radius of curvature of the droplet, and RH be the relative humidity.

5. The method according to claim 4, characterized in that, The formation and quantification basis of the spatial redistribution characteristics of salinity also include: In a hot and humid marine environment, the alternating wet and dry cycles on the equipment surface cause changes in the amount of salt deposited. The core driving mechanism is the coffee ring effect, which causes the condensation morphology to gradually change from a droplet spreading state to a ring-shaped condensation, thereby inducing the spatial redistribution of salt on the equipment surface. When deriving the correction relationship of salt density deposition after spatial redistribution of salt, the core conservation principle is that the total amount of salt remains unchanged before and after the wet-dry cycle, which provides the core basis for the derivation of the correction relationship.

6. The method according to claim 5, characterized in that, The derivation of the correction relationship for salt density deposition after salt redistribution also includes: Based on the principle of conservation of total salt content, the following relationship is constructed: in, This represents the amount of salt density deposited before the wet-dry cycle. This represents the amount of salt density deposited after salt redistribution. The droplet spreading radius before the wet-dry cycle. The droplet spreading radius after the wet-dry cycle; By simplifying the conservation equations, the expression for the amount of salt density deposited after salt redistribution is obtained as follows: 。 7. The method according to claim 6, characterized in that, The construction of the equation for calculating condensation after the wet-dry cycle correction also includes: Substitute the expression for salt density deposition after salt redistribution into the equation for calculating condensation after salt deliquescence correction. By replacing the water vapor partial pressure term in the Tetens formula, the final equation for calculating condensation after the wet-dry cycle correction is as follows: 。 8. A device for calculating the condensation on the surface of power transmission equipment in a hot and humid marine environment, characterized in that, include: The condensation determination module is used to obtain the spatial temperature and relative humidity parameters of the environment where the power transmission equipment to be predicted is located, and substitute them into the condensation formation condition criterion after salt deliquescence correction to determine whether the condensation formation condition is met. If it is not met, the calculation is terminated; if it is met, the subsequent steps are entered. The deliquescence correction module is used to construct a calculation equation for condensation amount after salt deliquescence correction by correcting the surface tension of the salt solution and the equivalent radius of curvature. By substituting environmental parameters into the equation, the condensation amount on the equipment surface after salt deliquescence correction can be obtained. The wet-dry correction module is used to combine the changes in salt density deposition and wetting contact angle caused by the alternating wet and dry conditions on the surface of equipment in a hot and humid marine environment. Based on the spatial redistribution characteristics of salt, the module calculates the condensation amount of the wet-dry cycle after dynamic salt density correction and inputting temperature and humidity parameters, thus completing the quantitative calculation of condensation amount on the surface of power transmission equipment in a hot and humid marine environment.

9. An electronic device, characterized in that, Including processor and memory; The processor reads executable program code stored in the memory to run a program corresponding to the executable program code, so as to implement the method as described in any one of claims 1-7.

10. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the method as described in any one of claims 1-7.

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