Dynamic evaporation rate monitoring method and system for standing low-temperature storage tank

Abstract

The invention relates to the technical field of low-temperature storage tanks, in particular to an evaporation rate dynamic monitoring method and system for a standing low-temperature storage tank, and the method comprises the steps: obtaining monitoring data under different liquid levels in the low-temperature storage tank, air flow velocity data, air pressure data and liquid level height monitoring data at different sampling positions are acquired; analyzing the monitoring data, determining the steam diffusivity under different liquid levels, and determining the influence factors of the airflow disturbance on the evaporation rate under different liquid levels by combining the change conditions of the liquid level data under different liquid levels; and correcting the initial estimated evaporation rate under different liquid level heights based on the influence factor of the airflow disturbance on the evaporation rate. According to the method, the initial estimated evaporation rate is corrected by analyzing the influence of airflow disturbance on the evaporation rate under different liquid level heights, and the accuracy of dynamic monitoring of the evaporation rate of the low-temperature storage tank is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of cryogenic storage tank technology, and specifically to a method and system for dynamic monitoring of evaporation rate in stationary cryogenic storage tanks. Background Technology

[0002] Cryogenic storage tanks are devices used to store cryogenic liquids or gases. They are typically used to store liquids with boiling points below room temperature, such as liquid nitrogen, liquid oxygen, and liquid helium, and are widely used in industry, medicine, and scientific research. Because cryogenic liquids can evaporate during storage due to temperature changes and changes in the external environment, potentially leading to tank failure or resource waste, dynamic monitoring of the evaporation rate of cryogenic storage tanks is particularly important.

[0003] In existing technologies, the evaporation rate of cryogenic storage tanks is typically determined by coupling and estimating multi-source monitoring data. However, since liquid level is a crucial factor affecting the evaporation rate, the liquid in the cryogenic storage tank experiences varying degrees of gas flow pressure and liquid level fluctuations at different liquid levels. This interference from the liquid level can cause significant deviations in real-time evaporation rate monitoring results as the liquid level changes, thus impacting the accuracy of evaporation rate monitoring and early warning. Summary of the Invention

[0004] To address the aforementioned technical problems, the present invention aims to provide a method and system for dynamic monitoring of evaporation rate in static cryogenic storage tanks. The specific technical solution adopted is as follows: In a first aspect, the present invention provides a method for dynamic monitoring of the evaporation rate of a static cryogenic storage tank, comprising the following steps: Acquire monitoring data at different liquid levels inside the cryogenic storage tank. The monitoring data includes vapor concentration data, as well as airflow velocity data, air pressure data, and liquid level monitoring data at different sampling locations. Analyze the changes in airflow velocity and air pressure data at different sampling locations under different liquid levels to determine the airflow interference at different liquid levels. Based on the distribution of airflow interference and vapor concentration data at different liquid levels, the vapor diffusion rate at different liquid levels was determined. Based on the vapor diffusivity and combined with the changes in liquid level data at different liquid levels, the influence factor of airflow disturbance on evaporation rate at different liquid levels is determined. Based on the influence factor of the airflow disturbance on the evaporation rate, the initial estimated evaporation rate at different liquid level heights is corrected to obtain the corrected evaporation rate at different liquid level heights.

[0005] In conjunction with the first aspect mentioned above, among some possible implementation methods, the degree of airflow disturbance at different liquid level heights is determined, including: Based on the difference distribution of airflow velocity data at different sampling locations under different liquid levels, the airflow velocity non-uniformity under different liquid levels is determined. Based on the difference between air pressure data at different sampling locations under different liquid levels, the degree of air pressure difference under different liquid levels is determined. By combining the airflow velocity non-uniformity and air pressure difference, the airflow interference degree at different liquid level heights is determined.

[0006] In conjunction with the first aspect above, among some possible implementation methods, determining the non-uniformity of airflow velocity at different liquid level heights includes: Based on the distribution level of airflow velocity at different sampling locations under different liquid levels, the mean airflow velocity at each sampling location is determined. The airflow velocity difference at each time moment is determined based on the difference between the airflow velocity at different sampling locations and the mean airflow velocity. Based on the differences in airflow velocity at different times under different liquid levels, the non-uniformity of airflow velocity at different liquid levels is determined.

[0007] In conjunction with the first aspect mentioned above, among some possible implementation methods, the degree of pressure difference at different liquid levels is determined, including: Determine the pressure range corresponding to the pressure at different sampling locations at different liquid levels for each moment; Based on the distribution level of the pressure difference at different times under different liquid levels, the pressure difference degree under different liquid levels is determined.

[0008] In conjunction with the first aspect above, among some possible implementation methods, the vapor diffusivity at different liquid level heights is determined, including: Based on the difference between the vapor concentration data at different liquid levels and the vapor concentration at the initial full tank state, the relative vapor concentration at different liquid levels is determined. Based on the airflow disturbance and relative vapor concentration at different liquid levels, the vapor diffusion rate at different liquid levels was determined.

[0009] In conjunction with the first aspect mentioned above, among some possible implementation methods, the influence factors of airflow disturbance on the evaporation rate at different liquid level heights are determined, including: Based on the differences in liquid level monitoring data at different sampling points under different liquid levels, the degree of liquid level fluctuation under different liquid levels is determined. By combining the vapor diffusivity and the degree of liquid surface fluctuation, the influence factor of airflow disturbance on evaporation rate at different liquid surface heights is determined.

[0010] In conjunction with the first aspect mentioned above, among some possible implementation methods, the degree of liquid level fluctuation at different liquid level heights is determined, including: In the liquid level monitoring data of all different sampling locations at different liquid level heights, determine the maximum height value and the minimum height value, as well as the height difference value of the liquid level monitoring values ​​of any two sampling locations at the same time. The degree of liquid level fluctuation is determined based on the distribution level of height difference values ​​corresponding to all sampling points at all times. Based on the maximum and minimum height values ​​at different liquid levels, and the degree of liquid level fluctuation, the degree of liquid level fluctuation at different liquid levels is determined.

[0011] In conjunction with the first aspect above, some possible implementations include correcting the initial estimated evaporation rate at different liquid level heights based on the aforementioned influencing factors, including: The influencing factors are normalized to obtain the modified parameters; The sum of the modified parameter and the set value is determined to obtain the evaporation rate correction coefficient; The product of the evaporation rate correction coefficient and the initial estimated evaporation rate at different liquid level heights is determined to obtain the corrected evaporation rate at different liquid level heights.

[0012] In conjunction with the first aspect above, in some possible implementations, the method further includes: predicting abnormal leaks in cryogenic storage tanks based on the corrected evaporation rate.

[0013] Secondly, the present invention also provides a dynamic monitoring device for the evaporation rate of a static cryogenic storage tank, the device comprising: The monitoring data acquisition module is used to acquire monitoring data at different liquid levels inside the cryogenic storage tank. The monitoring data includes vapor concentration data, as well as airflow velocity data, air pressure data, and liquid level monitoring data at different sampling locations. The airflow interference analysis module is used to analyze the changes in airflow velocity and air pressure data at different sampling locations under different liquid levels, and to determine the airflow interference under different liquid levels. The vapor diffusivity analysis module is used to determine the vapor diffusivity at different liquid levels based on the distribution of airflow interference and vapor concentration data at different liquid levels. The influencing factor analysis module is used to determine the influencing factor of airflow disturbance on evaporation rate at different liquid levels, based on the vapor diffusivity and the changes in liquid level data at different liquid levels. The evaporation rate correction module is used to correct the initial estimated evaporation rate at different liquid level heights based on the influence factor of the airflow disturbance on the evaporation rate, so as to obtain the corrected evaporation rate at different liquid level heights.

[0014] Thirdly, the present invention also provides a dynamic evaporation rate monitoring system for stationary cryogenic storage tanks, including a memory and a processor. The memory is used to store executable computer program code, and the processor is used to call and run the executable computer program code from the memory, causing the system to perform the dynamic evaporation rate monitoring method for stationary cryogenic storage tanks as described in the first aspect or any possible implementation thereof.

[0015] Fourthly, the present invention also provides a computer program product comprising: computer program code, which, when run on a computer, causes the computer to execute the dynamic monitoring method for evaporation rate of a stationary cryogenic storage tank as described in the first aspect or any possible implementation thereof.

[0016] Fifthly, the present invention also provides a computer-readable storage medium storing computer program code that, when executed on a computer, causes the computer to perform the dynamic monitoring method for evaporation rate of a stationary cryogenic storage tank as described in the first aspect or any possible implementation thereof.

[0017] This invention has the following beneficial effects: It determines the airflow disturbance degree at different liquid levels by analyzing the changes in gas pressure and airflow at different liquid levels within the tank. This reflects the airflow disturbance at different liquid levels. Then, based on the airflow disturbance at the liquid level and the distribution of steam concentration data, it determines the steam diffusivity at different liquid levels. This steam diffusivity represents the impact of airflow disturbance on the driving force of liquid evaporation. Based on the steam diffusivity and the changes in liquid level data at different liquid levels, it analyzes the degree of influence of airflow disturbance in the liquid phase space on the evaporation rate, thereby determining the influence factor of airflow disturbance on the evaporation rate at different liquid levels. Finally, based on the influence factor of airflow disturbance on the evaporation rate, it corrects the initial estimated evaporation rate at different liquid levels, thus solving the problem that airflow changes and liquid level fluctuations at different liquid levels cause large deviations in the evaporation rate as the liquid level changes, thereby effectively improving the accuracy of evaporation rate monitoring in cryogenic storage tanks. Attached Figure Description

[0018] To more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a flowchart illustrating the steps of a dynamic monitoring method for evaporation rate in a static cryogenic storage tank according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the dynamic monitoring device for evaporation rate of a static cryogenic storage tank according to an embodiment of the present invention. Figure 3 This is a schematic diagram of the evaporation rate dynamic monitoring system for stationary cryogenic storage tanks according to an embodiment of the present invention. Detailed Implementation

[0020] To clearly illustrate the technical features of this solution, the invention will be described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0021] Embodiments of the present invention will now be described in more detail with reference to the accompanying drawings. While some embodiments of the invention are shown in the drawings, it should be understood that the invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the invention. It should be understood that the accompanying drawings and embodiments are for illustrative purposes only and are not intended to limit the scope of protection of the invention.

[0022] It should be understood that the various steps described in the method embodiments of the present invention may be performed in different orders and / or in parallel. Furthermore, the method embodiments may include additional steps and / or omit the steps shown. The scope of the present invention is not limited in this respect.

[0023] The term "comprising" and its variations as used herein are open-ended inclusions, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Definitions of other terms will be given in the description below.

[0024] It should be noted that the concepts of "first" and "second" mentioned in this invention are only used to distinguish different devices, modules or units, and are not used to limit the order of functions performed by these devices, modules or units or their interdependencies.

[0025] Although operations or steps are described in a specific order in the accompanying drawings in the embodiments of the present invention, this should not be construed as requiring these operations or steps to be performed in the specific order or serial order shown, or requiring all of the shown operations or steps to be performed to obtain the desired result. In the embodiments of the present invention, these operations or steps may be performed serially; they may be performed in parallel; or a portion of these operations or steps may be performed.

[0026] Furthermore, it is understood that the data involved in the technical solutions of this invention (including but not limited to the data itself, the acquisition or use of the data) shall comply with the requirements of relevant laws, regulations and related provisions. Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains, and all parameters or indicators in the formulas involved in this invention are normalized values ​​that have eliminated the influence of dimensions.

[0027] The following will describe in detail, with reference to the accompanying drawings, the method and system for dynamic monitoring of evaporation rate of stationary cryogenic storage tanks provided by the embodiments of the present invention.

[0028] Figure 1 This diagram illustrates the basic flow chart of the dynamic monitoring method for evaporation rate of static cryogenic storage tanks provided by an embodiment of the present invention. Figure 1 As shown, the method specifically includes the following steps: Step S100: Obtain monitoring data at different liquid levels inside the cryogenic storage tank. The monitoring data includes steam concentration data, as well as airflow velocity data, air pressure data, and liquid level monitoring data at different sampling locations.

[0029] Cryogenic storage tanks require good thermal insulation performance, typically employing multi-layer vacuum insulation technology (vacuum insulation layer) to reduce heat conduction. However, the cryogenic liquid within will evaporate during storage due to temperature changes, changes in the external environment, and other factors. Evaporation rate refers to the mass of liquid that evaporates from the cryogenic storage tank per unit time. For stationary cryogenic storage tanks, the evaporation rate is usually related to factors such as the external ambient temperature, the internal pressure of the tank, and the type of liquid.

[0030] In cryogenic storage tanks, the liquid level typically decreases gradually due to usage and consumption. This change in liquid level significantly impacts the evaporation rate, especially in cryogenic tanks (such as LNG, liquid nitrogen, and liquid oxygen tanks). Existing evaporation rate estimation methods assume that the gas flow pressure and liquid level fluctuation conditions are the same at different liquid levels. However, these factors vary with actual liquid level changes, leading to errors in the estimated evaporation rate.

[0031] Therefore, to improve the accuracy of evaporation rate monitoring, this embodiment of the invention uses sensors inside the cryogenic storage tank to acquire monitoring data at different liquid level heights. Subsequent analysis of the monitoring data determines the influencing factors of different liquid level heights on the evaporation rate, thereby achieving accurate correction of the evaporation rate. The monitoring data includes steam concentration data, as well as airflow velocity data, air pressure data, and liquid level monitoring data at different sampling locations.

[0032] In this embodiment of the invention, multiple pressure sensors and hot-wire anemometers are deployed inside the cryogenic storage tank to collect multiple local real-time pressure and airflow velocity values ​​at corresponding liquid levels, with a sampling interval of 0.1 seconds. Simultaneously, a vapor concentration sensor is deployed inside the cryogenic storage tank to collect vapor concentration values ​​at different liquid levels. Furthermore, liquid level height information is obtained based on liquid surface laser ranging, and a three-dimensional model of the liquid surface at the current liquid level is created. Based on the three-dimensional modeling results, liquid level height monitoring data at different sampling locations at different liquid levels is obtained. The vapor concentration data at different liquid levels, the airflow velocity data and pressure data at different sampling locations, and the liquid level monitoring data together constitute the monitoring data inside the cryogenic storage tank at different liquid levels. It should be understood that different liquid levels refer to the liquid level inside the cryogenic storage tank when evaporation rate detection is performed, while the liquid level monitoring data refers to the actual liquid level height values ​​at different sampling locations obtained through liquid surface laser ranging.

[0033] Step S200: Analyze the changes in airflow velocity and air pressure data at different sampling locations under different liquid levels to determine the airflow interference degree under different liquid levels.

[0034] Because the liquid level in a cryogenic storage tank gradually decreases with use, changes in liquid level alter the disturbance effect of airflow on the liquid, leading to localized fluctuations at the gas-liquid interface. Larger fluctuations exacerbate the liquid evaporation process, thus affecting the measurement of the liquid evaporation rate within the tank. Therefore, this embodiment of the invention first calculates the corresponding liquid-airflow disturbance based on changes in gas pressure and airflow at the real-time liquid level, thereby determining the degree of airflow interference at different liquid level levels.

[0035] In this embodiment of the invention, step S200, determining the airflow disturbance at different liquid level heights, includes: Step S201: Based on the difference distribution of airflow velocity data at different sampling locations under different liquid levels, determine the airflow velocity non-uniformity under different liquid levels.

[0036] Different liquid level heights typically have varying effects on evaporation rates. When the liquid level is low, airflow disturbances are more likely to cause local fluctuations on the liquid surface, making the airflow disturbances more pronounced and further increasing the evaporation rate. Conversely, when the liquid level is high, the gas phase space becomes smaller, the gas's buffering capacity weakens, the disturbance effect is weaker, and the evaporation rate error is generally smaller. Since the essence of airflow disturbance is the local non-uniform distribution of air pressure and airflow, the stronger the airflow disturbance, the greater the corresponding pressure imbalance and the more non-uniform the airflow velocity. Therefore, this study analyzes the difference distribution of airflow velocity data at different sampling locations under different liquid level heights to determine the airflow velocity non-uniformity at different liquid level heights.

[0037] In this embodiment of the invention, step S201, determining the non-uniformity of airflow velocity at different liquid levels, includes: First, based on the distribution level of airflow velocity at different sampling locations under different liquid levels, the average airflow velocity at each sampling location is determined. Specifically, for the current liquid level... Calculate the height of this liquid level. Next The average airflow velocity at all sampling locations at the sampling time is used to obtain the th sampling moment. The average airflow velocity at each sampling time point is denoted as . .

[0038] Secondly, based on the difference between the airflow velocity at different sampling locations at each moment and the average airflow velocity, the airflow velocity difference at each moment is determined. Specifically, for the current liquid level... Calculate the height of this liquid level respectively. Next The airflow velocity at each sampling location at the sampling time and the... Average airflow velocity at each sampling time absolute value of the difference ,in, Therefore, the liquid level height is... At a certain sampling point at a sampling time The airflow velocity at point [number]. Then, the airflow velocity at point [number] is calculated. The absolute value of the difference at all sampling locations at each sampling time. The cumulative value is used to obtain the height of the liquid level at this point. Difference in airflow velocity at each sampling time ,in, Number of sampling locations. Difference in airflow velocity. Represents the first The relative difference in local airflow velocity at different sampling locations at each sampling time is represented by a value that indicates a greater difference and a more significant difference in local airflow velocity at that time.

[0039] Finally, based on the differences in airflow velocity at different times under different liquid levels, the non-uniformity of airflow velocity at different liquid levels is determined. Specifically, for the current liquid level... Calculate the height of this liquid level. Differences in airflow velocity at all sampling times The standard deviation is used as the height of the liquid surface. The standard deviation indicates the non-uniformity of airflow velocity. The larger the standard deviation, the greater the variation in airflow velocity at different sampling times, and the more non-uniform the airflow velocity.

[0040] Step S202: Determine the degree of pressure difference at different liquid levels based on the difference between the air pressure data at different sampling locations under different liquid levels.

[0041] Since airflow interference is often related to pressure imbalance, greater local pressure imbalance leads to airflow shifts and causes airflow interference. Therefore, the degree of pressure imbalance needs to be considered to more accurately measure the degree of airflow interference at this liquid level. Thus, the differences in pressure data at different sampling locations at different liquid levels are analyzed to determine the degree of pressure difference at different liquid levels.

[0042] In this embodiment of the invention, step S202, determining the pressure difference at different liquid levels, includes: First, from the air pressure data at different sampling locations under different liquid levels, determine the pressure range corresponding to the air pressure at different sampling locations at each moment. Specifically, for the current liquid level... Calculate the height of this liquid level respectively. Next The maximum air pressure at different sampling locations at each sampling time. and minimum air pressure And calculate the maximum air pressure. and minimum air pressure The difference As the first The air pressure difference at each sampling time.

[0043] Secondly, based on the distribution level of the pressure difference at different times under different liquid levels, the pressure difference degree at different liquid levels is determined. Specifically, for the current liquid level... Calculate the pressure range at different sampling times. The average value is used to obtain the liquid level height. The degree of air pressure difference. The greater the air pressure range at different sampling times, the greater the corresponding air pressure difference, and the more likely it is to cause airflow disturbance.

[0044] Step S203: Combine the airflow velocity non-uniformity and air pressure difference to determine the airflow interference degree at different liquid level heights.

[0045] Simultaneously, by combining the airflow velocity non-uniformity and pressure difference at different liquid level heights, the airflow interference degree at different liquid level heights is determined. The greater the airflow velocity non-uniformity and the greater the pressure difference, the greater the airflow interference degree at that liquid level height, and the greater the impact of the airflow on the evaporation rate of the liquid surface. In this embodiment of the invention, for the current liquid level height... Calculate the product of the airflow velocity non-uniformity and the air pressure difference at this liquid level, and use this product as the liquid level. The degree of airflow disturbance.

[0046] The above method can be used to determine the degree of airflow disturbance at different liquid levels.

[0047] Step S300: Based on the distribution of airflow interference and steam concentration data at different liquid levels, determine the steam diffusion rate at different liquid levels.

[0048] The above steps calculated the airflow disturbances generated by the liquid at different liquid levels in the cryogenic storage tank. Airflow disturbances in the gas phase space affect the liquid's evaporation rate, primarily in two aspects: ① As airflow disturbance increases, the random movement of different gas molecules in the gas phase space increases, leading to a greater driving force for evaporation at the liquid surface and thus increasing the evaporation rate. ② Greater airflow disturbance can disrupt the gas film on the liquid surface, making the exchange interface between the liquid and air more active, thereby promoting evaporation.

[0049] Therefore, the distribution of airflow disturbance and vapor concentration data at different liquid level heights was analyzed to determine the vapor diffusivity at different liquid level heights. This vapor diffusivity represents the influence of airflow disturbance on the driving force of liquid evaporation. Specifically, in the gas phase space, airflow disturbance pushes gas molecules, causing vapor molecules to diffuse rapidly, thus promoting evaporation and diffusion. Simultaneously, the lower the vapor concentration in the gas phase space below the liquid surface, the greater the driving force for vapor diffusion at the liquid surface, and thus the greater the vapor diffusivity.

[0050] In this embodiment of the invention, step S300, determining the vapor diffusion rate at different liquid level heights, includes: First, based on the difference between the vapor concentration data at different liquid levels and the vapor concentration at the initial full tank state, the relative vapor concentration at different liquid levels is determined. Specifically, for the current liquid level... Calculate the height of this liquid level. The average steam concentration is obtained by taking the mean of the steam concentration data below, and is denoted as . Obtain the steam concentration when the tank is initially full. Then, the average steam concentration is calculated. With steam concentration The difference The difference is used as the liquid level height. The relative steam concentration below.

[0051] Secondly, based on the airflow disturbance and relative vapor concentration at different liquid levels, the vapor diffusion rate at different liquid levels is determined. Specifically, for the current liquid level... Calculate the airflow disturbance at this liquid level. With relative steam concentration normalized value The ratio of ) and the ratio As liquid level height The vapor diffusivity under the given conditions is denoted as . Among them, when the relative steam concentration The smaller the value, the slower the vapor concentration rises as the liquid level decreases, and the weaker the diffusion dynamics. Therefore, considering the airflow disturbance... The greater the corresponding vapor diffusion rate, the better.

[0052] The vapor diffusion rate at different liquid levels can be determined using the above method.

[0053] Step S400: Based on the vapor diffusivity and the changes in liquid level data at different liquid levels, determine the influence factor of airflow disturbance on evaporation rate at different liquid levels.

[0054] Airflow disturbances affect not only the gas phase space but also the liquid phase space. Airflow disturbances cause fluctuations in the liquid surface; increased surface fluctuations typically increase the contact area between the liquid and the airflow, potentially promoting evaporation. Therefore, based on vapor diffusivity, it is necessary to analyze the impact of airflow disturbances on the liquid phase space by considering changes in liquid level data at different liquid heights, ultimately determining the influencing factors of airflow disturbances on the evaporation rate.

[0055] In this embodiment of the invention, step S400, determining the influence factor of airflow disturbance on the evaporation rate at different liquid level heights, includes: Step S401: Based on the differences in liquid level monitoring data at different sampling points under different liquid levels, determine the degree of liquid level fluctuation under different liquid levels.

[0056] The degree of liquid surface fluctuation reflects the extent of liquid surface height variation at different locations under each liquid level. A greater degree of fluctuation at a given liquid level indicates more severe interference from airflow on the liquid surface, more frequent contact between the liquid and airflow, and consequently, a higher evaporation rate of the liquid in the tank. Therefore, the differences in liquid level monitoring data from different sampling points at different liquid levels are analyzed to determine the degree of liquid surface fluctuation at different liquid levels.

[0057] In this embodiment of the invention, step S400, determining the degree of liquid level fluctuation at different liquid level heights, includes: First, in the liquid level monitoring data from all different sampling locations at different liquid level heights, the maximum and minimum height values, as well as the height difference between any two sampling locations at the same time, are determined. Specifically, for the current liquid level height... The maximum and minimum values ​​of the liquid level monitoring data from all different sampling locations were determined, thus obtaining the maximum and minimum height values, which were denoted as follows: and At the same time, at all different sampling locations From the liquid level monitoring data, determine any two sampling locations at the same time. Liquid level monitoring value and absolute value of the difference between and the absolute value of the difference As a value of high degree of difference.

[0058] Secondly, based on the distribution level of height difference values ​​corresponding to all sampling points at all times, the degree of fluctuation in liquid level height is determined. Specifically, for the current liquid level height... The average height difference between any two sampling locations at the same time is determined to obtain the first height difference value. The average of the first height difference values ​​at all times is then calculated to obtain the second height difference value. This second height difference value is taken as the degree of liquid level height fluctuation and denoted as [value missing]. The degree of fluctuation in liquid level height It represents the unevenness of the liquid surface fluctuation. The larger the value, the more uneven the liquid surface fluctuation and the greater the degree of fluctuation.

[0059] Finally, based on the maximum and minimum height values ​​at different liquid level heights, and the degree of liquid level fluctuation, the degree of liquid level fluctuation at different liquid level heights is determined. Specifically, for the current liquid level height... Calculate the maximum height value With minimum height value ratio The ratio This represents the range of amplitude fluctuations in the liquid surface at this height; the larger the value, the more violent the fluctuations. Furthermore, this ratio is calculated. With the degree of fluctuation of liquid level The product of these two values ​​is used as the current liquid level height. The degree of fluctuation of the liquid surface below, and recorded as .

[0060] The degree of liquid level fluctuation at different liquid level heights can be determined using the above method.

[0061] Step S402: Combine the vapor diffusion rate and the liquid surface fluctuation degree to determine the influence factor of airflow disturbance on evaporation rate at different liquid surface heights.

[0062] The above analysis of airflow disturbances at arbitrary liquid level in a cryogenic storage tank yielded results regarding their impact on the evaporation rate of both the gas and liquid phases. Specifically, the vapor diffusivity represents the degree of influence of airflow disturbances on the evaporation rate in the gas phase, while the liquid level fluctuation represents the degree of influence of airflow disturbances on the evaporation rate in the liquid phase. Therefore, by combining the vapor diffusivity at different liquid level and the aforementioned liquid level fluctuation, the influence factor of airflow disturbances on the evaporation rate at different liquid level can be determined.

[0063] In this embodiment of the invention, for the current liquid level height Calculate the vapor diffusivity at this liquid level. and the degree of liquid surface fluctuation The product of these factors is used as the influence factor of airflow disturbance on the evaporation rate at this liquid level, and is denoted as... At this time there is Since a greater vapor diffusivity and a greater degree of liquid surface undulation correspond to a greater promotion of evaporation, then... The larger the value, the greater the influence of the corresponding liquid level height.

[0064] The above method can be used to determine the influence factor of airflow disturbance on evaporation rate at different liquid level heights.

[0065] Step S500: Based on the influence factor of the airflow disturbance on the evaporation rate, the initial estimated evaporation rate at different liquid level heights is corrected, and the corrected evaporation rate at different liquid level heights is determined.

[0066] Since the degree to which airflow disturbance promotes evaporation varies at different liquid levels, a larger influence factor indicates a greater degree of airflow disturbance at the corresponding liquid level, resulting in a larger deviation of the estimated evaporation rate from the actual evaporation rate and a greater degree of correction required, and vice versa. Therefore, by utilizing the influence factor of airflow disturbance on evaporation rate at different liquid levels, the initial estimated evaporation rate at different liquid levels is corrected, thus obtaining the corrected evaporation rate at different liquid levels.

[0067] In this embodiment of the invention, step S500, determining the corrected evaporation rate at different liquid level heights, includes: First, the influencing factors are normalized to obtain the modified parameters. Specifically, for the current liquid level... The liquid level height is determined using a normalization function. Factors affecting evaporation rate Normalize to the range [0,1] to obtain the liquid level height. Modify the parameters below and record them as follows. .

[0068] Next, the sum of the modified parameter and the set value is determined to obtain the evaporation rate correction coefficient.

[0069] Finally, the product of the evaporation rate correction coefficient and the initial estimated evaporation rate at different liquid level heights is determined to obtain the corrected evaporation rate at different liquid level heights. Specifically, for the current liquid level height... Corrected evaporation rate ;in, Indicates liquid level height The initial estimated evaporation rate is as follows. This indicates the set value. This represents the evaporation rate correction factor. When the liquid level is... Modify parameters below The larger the value, the greater the degree to which airflow disturbance at the corresponding liquid level promotes the evaporation rate. Therefore, the greater the actual evaporation rate after weighting with this value as the weight.

[0070] This method allows for the correction of the estimated evaporation rate at different liquid level heights, thus obtaining a more accurate evaporation rate after correction at different liquid level heights.

[0071] In this embodiment of the invention, the method further includes: predicting abnormal leaks in cryogenic storage tanks based on the corrected evaporation rate. Specifically, the occurrence of abnormal leaks is closely related to the evaporation behavior of the storage tank. Generally, the evaporation rate of a cryogenic storage tank fluctuates within a certain range. If the evaporation rate significantly exceeds the normal range, it may indicate a leak or other malfunction. Therefore, by monitoring parameters such as the evaporation rate, pressure, and temperature of the storage tank in real time, a predictive model is established using historical data and machine learning algorithms, and alarm thresholds are set to assist relevant personnel in fault diagnosis and maintenance. Simultaneously, regular equipment inspections are conducted, especially checking the condition of valves, pipes, seals, and other components to ensure there is no aging or damage, thus preventing leaks.

[0072] Based on the same inventive concept, embodiments of the present invention also provide a dynamic monitoring device for the evaporation rate of stationary cryogenic storage tanks, such as... Figure 2 As shown, the device includes: The monitoring data acquisition module is used to acquire monitoring data at different liquid levels inside the cryogenic storage tank. The monitoring data includes vapor concentration data, as well as airflow velocity data, air pressure data, and liquid level monitoring data at different sampling locations. The airflow interference analysis module is used to analyze the changes in airflow velocity and air pressure data at different sampling locations under different liquid levels, and to determine the airflow interference under different liquid levels. The vapor diffusivity analysis module is used to determine the vapor diffusivity at different liquid levels based on the distribution of airflow interference and vapor concentration data at different liquid levels. The influencing factor analysis module is used to determine the influencing factor of airflow disturbance on evaporation rate at different liquid levels, based on the vapor diffusivity and the changes in liquid level data at different liquid levels. The evaporation rate correction module is used to correct the initial estimated evaporation rate at different liquid level heights based on the influence factor of the airflow disturbance on the evaporation rate, so as to obtain the corrected evaporation rate at different liquid level heights.

[0073] It should be noted that the device provided in the above embodiments is only an example of the division of the above functional modules. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the computer device can be divided into different functional modules to complete all or part of the functions described above.

[0074] Based on the same inventive concept, embodiments of the present invention also provide a dynamic monitoring system for the evaporation rate of stationary cryogenic storage tanks, such as... Figure 3As shown, the system includes: a memory 301, a processor 302, and computer program code 303 stored in the memory 301 and running on the processor 302. When the processor 302 executes the computer program code 303, the system can execute any of the aforementioned methods for dynamic monitoring of evaporation rate of stationary cryogenic storage tanks.

[0075] In this embodiment of the invention, the system can be divided into functional modules according to the above method example. For example, each module can correspond to a separate functional module, or two or more functions can be integrated into one processing module. The integrated module can be implemented in hardware. It should be noted that the module division in this embodiment is illustrative and only represents one logical functional division. In actual implementation, there may be other division methods.

[0076] Based on the same inventive concept, embodiments of the present invention also provide a computer program product, which includes: computer program code, which, when run on a computer, causes the computer to execute any of the aforementioned methods for dynamic monitoring of evaporation rate of stationary cryogenic storage tanks.

[0077] Based on the same inventive concept, embodiments of the present invention also provide a computer-readable storage medium storing computer program code, which, when executed on a computer, causes the computer to perform any of the aforementioned methods for dynamic monitoring of evaporation rate in stationary cryogenic storage tanks.

[0078] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A method for dynamic monitoring of evaporation rate in stationary cryogenic storage tanks, characterized in that, Includes the following steps: Acquire monitoring data at different liquid levels inside the cryogenic storage tank. The monitoring data includes vapor concentration data, as well as airflow velocity data, air pressure data, and liquid level monitoring data at different sampling locations. Analyze the changes in airflow velocity and air pressure data at different sampling locations under different liquid levels to determine the airflow interference at different liquid levels. Based on the distribution of airflow interference and vapor concentration data at different liquid levels, the vapor diffusion rate at different liquid levels was determined. Based on the vapor diffusivity and combined with the changes in liquid level data at different liquid levels, the influence factor of airflow disturbance on evaporation rate at different liquid levels is determined. Based on the influence factor of the airflow disturbance on the evaporation rate, the initial estimated evaporation rate at different liquid level heights is corrected to obtain the corrected evaporation rate at different liquid level heights.

2. The method for dynamic monitoring of evaporation rate in static cryogenic storage tanks according to claim 1, characterized in that, Determine the airflow disturbance at different liquid levels, including: Based on the difference distribution of airflow velocity data at different sampling locations under different liquid levels, the airflow velocity non-uniformity under different liquid levels is determined. Based on the difference between air pressure data at different sampling locations under different liquid levels, the degree of air pressure difference under different liquid levels is determined. By combining the airflow velocity non-uniformity and air pressure difference, the airflow interference degree at different liquid level heights is determined.

3. The method for dynamic monitoring of evaporation rate in static cryogenic storage tanks according to claim 2, characterized in that, Determine the non-uniformity of airflow velocity at different liquid levels, including: Based on the distribution level of airflow velocity at different sampling locations under different liquid levels, the mean airflow velocity at each sampling location is determined. The airflow velocity difference at each time moment is determined based on the difference between the airflow velocity at different sampling locations and the mean airflow velocity. Based on the differences in airflow velocity at different times under different liquid levels, the non-uniformity of airflow velocity at different liquid levels is determined.

4. The method for dynamic monitoring of evaporation rate in static cryogenic storage tanks according to claim 2, characterized in that, Determine the pressure difference at different liquid levels, including: Determine the pressure range corresponding to the pressure at different sampling locations at different liquid levels for each moment; Based on the distribution level of the pressure difference at different times under different liquid levels, the pressure difference degree under different liquid levels is determined.

5. The method for dynamic monitoring of evaporation rate in static cryogenic storage tanks according to claim 1, characterized in that, Determining the vapor diffusivity at different liquid level heights includes: Based on the difference between the vapor concentration data at different liquid levels and the vapor concentration at the initial full tank state, the relative vapor concentration at different liquid levels is determined. Based on the airflow disturbance and relative vapor concentration at different liquid levels, the vapor diffusion rate at different liquid levels was determined.

6. The method for dynamic monitoring of evaporation rate in static cryogenic storage tanks according to claim 1, characterized in that, The factors influencing the evaporation rate at different liquid level heights were determined, including: Based on the differences in liquid level monitoring data at different sampling points under different liquid levels, the degree of liquid level fluctuation under different liquid levels is determined. By combining the vapor diffusivity and the degree of liquid surface fluctuation, the influence factor of airflow disturbance on evaporation rate at different liquid surface heights is determined.

7. The method for dynamic monitoring of evaporation rate in static cryogenic storage tanks according to claim 6, characterized in that, Determine the degree of liquid level fluctuation at different liquid level heights, including: In the liquid level monitoring data of all different sampling locations at different liquid level heights, determine the maximum height value and the minimum height value, as well as the height difference value of the liquid level monitoring values ​​of any two sampling locations at the same time. The degree of liquid level fluctuation is determined based on the distribution level of height difference values ​​corresponding to all sampling points at all times. Based on the maximum and minimum height values ​​at different liquid levels, and the degree of liquid level fluctuation, the degree of liquid level fluctuation at different liquid levels is determined.

8. The method for dynamic monitoring of evaporation rate in static cryogenic storage tanks according to claim 1, characterized in that, The initial estimated evaporation rate at different liquid level heights is corrected based on the aforementioned influencing factors, including: The influencing factors are normalized to obtain the modified parameters; The sum of the modified parameter and the set value is determined to obtain the evaporation rate correction coefficient; The product of the evaporation rate correction coefficient and the initial estimated evaporation rate at different liquid level heights is determined to obtain the corrected evaporation rate at different liquid level heights.

9. The method for dynamic monitoring of evaporation rate in static cryogenic storage tanks according to claim 1, characterized in that, The method also includes: predicting abnormal leaks in cryogenic storage tanks based on the corrected evaporation rate.

10. A dynamic monitoring system for the evaporation rate of stationary cryogenic storage tanks, characterized in that, The system includes a memory, a processor, and executable computer program code stored in the memory and executable on the processor. When the processor executes the computer program code, it performs the dynamic monitoring method for evaporation rate of a stationary cryogenic storage tank as described in any one of claims 1 to 9.

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