High-pressure gas storage cabinet pollutant leakage and diffusion analysis method and related device

Abstract

The invention discloses an analysis method for pollutant leakage and diffusion of a high-pressure gas storage cabinet and a related device, and the method comprises the steps: obtaining the internal physical property parameters of the high-pressure gas storage cabinet, the external physical property parameters of the high-pressure gas storage cabinet and the internal and external physical property parameters of the high-pressure gas storage cabinet; calculating a jet droplet evaporation heat transfer process when pollutants in the high-pressure gas storage cabinet leak; acquiring flow and particle size distribution under the condition of target leakage, calculating fitting parameter values of the particle size distribution by using an R-R particle size distribution calculation method, and establishing a flow and particle size distribution database; and analyzing the leakage and diffusion of the pollutants in the high-pressure gas storage cabinet according to the evaporation heat transfer energy and flow of the jet liquid drops and the particle size distribution database during the leakage of the pollutants in the high-pressure gas storage cabinet. By correcting the liquid drop evaporation model, the heat exchange process of the pressure reduction process is simplified into the heat exchange process of constant-pressure flowing, and the whole process of diffusion of pollutants leaked from the high-pressure gas storage cabinet is simplified.

Description

Technical Field

[0001] The present invention belongs to the field of container leakage safety and relates to an analysis method for the leakage and diffusion of pollutants in a high-pressure gas storage cabinet and a related device. Background Art

[0002] With the advancement of industrialization, many raw materials, by-products, and protective gases are stored in liquid form in high-pressure gas tanks (such as propane and R134a) for easy transportation and use. In the event of a leak, the gas often flashes at a certain pressure, posing a significant threat to personnel health and equipment safety. Emergency response to such leaks requires extensive engineering experience, necessitating analysis of pollutant leakage and diffusion for accident prediction.

[0003] Current research methods for studying the leakage and diffusion of pollutants in multiphase flows primarily include experiments, mathematical models, and numerical calculations. Computational fluid dynamics (CFD) has emerged as the most direct and cost-effective approach for studying the leakage and diffusion of pollutants in multiphase flows in recent years. However, when dealing with complex operating conditions, existing computational methods often rely on the Euler method to accurately simulate the behavior of flash jets, calculating the entire formation process upstream and downstream of the leak. This approach is computationally expensive and time-consuming, and since the primary concern during an accident is the diffusion of pollutants, computations for the flash jet's startup process, upstream of the leak, waste computing resources. Compared to the Euler method, coupled continuous and discrete phase calculations can better account for the diffusion of pollutants downstream of the leak during this leakage process without wasting computing resources upstream of the leak. However, this approach also has a drawback: the model uses a constant-pressure heating and boiling method to calculate droplet evaporation, making it unsuitable for the superheated evaporation of droplets in a jet caused by sudden pressure changes.

[0004] In the original model, the energy exchange between the droplet and the environment can be expressed as follows:

[0005] Where, is the constant pressure specific heat of the droplet, h is the convective heat transfer coefficient, is the continuous phase temperature, is the droplet temperature, is the droplet surface area, is the latent heat of vaporization. is the boiling point, which is constant before the droplet completely evaporates, so the equation becomes:

[0006] Since the equation does not involve the function of pressure, when using this method to calculate the evaporation caused by a sudden change in pressure, the droplet temperature is determined to be the boiling point temperature, and the energy of a part of the superheat is ignored, resulting in an energy imbalance. Summary of the Invention

[0007] The purpose of the present invention is to provide a method and related device for analyzing the leakage and diffusion of pollutants in a high-pressure gas storage cabinet, so as to solve the problem of energy imbalance caused by ignoring superheat energy in the prior art.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions: A method for analyzing the leakage and diffusion of pollutants in a high-pressure gas storage cabinet, comprising: Obtaining physical property parameters inside the high-pressure gas storage cabinet, physical property parameters outside the high-pressure gas storage cabinet, and physical property parameters inside and outside the high-pressure gas storage cabinet; Based on the physical parameters inside and outside the high-pressure gas storage cabinet, and the physical parameters inside and outside the high-pressure gas storage cabinet, the evaporation heat transfer energy of the jet droplets when the pollutants leak from the high-pressure gas storage cabinet is calculated; Obtain the flow rate and particle size distribution under target leakage conditions, calculate the fitting parameter values of the particle size distribution using the RR particle size distribution calculation method, and establish a flow rate and particle size distribution database; The leakage and diffusion of pollutants in high-pressure gas storage cabinets are analyzed based on the database of jet droplet evaporation heat transfer energy, flow rate and particle size distribution when pollutants leak from high-pressure gas storage cabinets.

[0009] Furthermore, the physical parameters of the high-pressure gas storage cabinet include: temperature, saturation pressure of the substance, specific heat at constant pressure, density, surface tension, boiling point temperature and latent heat value; The external physical parameters of the high-pressure gas storage cabinet include: ambient temperature, ambient pressure and molecular weight of the leaked substance; The physical property parameter that penetrates the inside and outside of the high-pressure gas storage cabinet is the saturated vapor pressure within the temperature range from lower than the boiling point inside the high-pressure gas storage cabinet to room temperature.

[0010] Furthermore, the calculation method of the heat transfer energy of the jet droplet evaporation when the pollutant leaks from the high-pressure gas storage cabinet is: Calculate the enthalpy of superheat of jet droplets when pollutants leak from the high-pressure gas storage cabinet based on the physical parameters inside and outside the high-pressure gas storage cabinet and the physical parameters inside and outside the high-pressure gas storage cabinet; Based on the enthalpy of the droplet superheat, the temperature change during the evaporation of the jet droplet when the pollutant leaks from the high-pressure gas storage cabinet is calculated.

[0011] Furthermore, the calculation method of the enthalpy value of the jet droplet superheat is:

[0012]

[0013] in, is the droplet temperature, is the saturation temperature, is the enthalpy released by the droplet due to the pressure change, is the constant-pressure specific heat of the droplet, For superheat.

[0014] Furthermore, the temperature change of the jet droplets during evaporation is calculated as follows:

[0015]

[0016]

[0017] in, is the constant pressure specific heat of the droplet, h is the convective heat transfer coefficient, is the continuous phase temperature, is the droplet temperature, is the droplet surface area, is the latent heat of vaporization, is the superheat, is the saturation temperature, is the mass of the evaporated droplet, For time.

[0018] Furthermore, the particle size distribution under the target leakage condition is measured at the leakage port by a scaled experiment using a PIV instrument; the flow rate under the target leakage condition is measured by weighing the high-pressure gas storage cabinet before and after the leakage within a certain period of time.

[0019] Furthermore, the RR particle size distribution calculation method is:

[0020] in, It represents the mass fraction of droplets smaller than the droplet diameter, n is the size distribution index, is the droplet diameter, is the average droplet diameter.

[0021] An analysis system for the leakage and diffusion of pollutants in a high-pressure gas storage cabinet, comprising: A data acquisition module, the data acquisition module is used to obtain physical property parameters inside the high-pressure gas storage cabinet, physical property parameters outside the high-pressure gas storage cabinet, and physical property parameters inside and outside the high-pressure gas storage cabinet; a first calculation module, configured to calculate a jet droplet evaporation heat transfer process when pollutants leak from the high-pressure gas storage cabinet based on physical parameters inside the high-pressure gas storage cabinet, physical parameters outside the high-pressure gas storage cabinet, and physical parameters that penetrate inside and outside the high-pressure gas storage cabinet; a second calculation module, which is used to obtain the flow rate and particle size distribution in the case of target leakage, calculate the fitting parameter value of the particle size distribution using the RR particle size distribution calculation method, and establish a flow rate and particle size distribution database; The analysis module is used to analyze the leakage and diffusion of pollutants in the high-pressure gas storage cabinet based on the jet droplet evaporation heat transfer process and the flow rate and particle size distribution database when the pollutants in the high-pressure gas storage cabinet leak.

[0022] A terminal device comprises a memory, a processor and a computer program stored in the memory and executable on the processor, wherein the steps of the method are implemented when the processor executes the computer program.

[0023] A computer-readable storage medium stores a computer program, which implements the steps of the method when executed by a processor.

[0024] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a method for analyzing the leakage and diffusion of pollutants in a high-pressure gas storage cabinet. By obtaining the external physical parameters of the high-pressure gas storage cabinet, the internal physical parameters of the high-pressure gas storage cabinet, and the physical parameters that penetrate the internal and external physical parameters of the high-pressure gas storage cabinet, the superheat and its corresponding enthalpy value are calculated, and the evaporation heat transfer energy during the leakage process is calculated. At the same time, the flow rate and particle size distribution data under the target leakage condition are measured based on the scaled experiment, and a database is established after the fitting parameters are calculated. Finally, based on the above data, CFD software is used to obtain the relevant calculation results of the pollutant diffusion under the target leakage condition to analyze the leakage accident. The present invention uses a method of coupling calculation of continuous phase and discrete phase to reasonably simplify the energy balance of the evaporation process in the flash jet pollutant diffusion, and develops a relatively simple calculation method for this type of emergency prediction method for pollutant diffusion caused by leakage in a high-pressure gas storage cabinet. By modifying the droplet evaporation model, it can well adapt to the diffusion of pollutants leaked from the high-pressure gas storage cabinet. By simplifying the energy balance of the flash evaporation process, the heat exchange process of the decompression process is simplified to the heat exchange process of constant pressure flow, thereby simplifying the entire process of pollutant diffusion caused by leakage in the high-pressure gas storage cabinet. This simplified jet flash calculation method does not involve bubble nucleation during the flash process, thus enabling faster calculation of pollutant leakage diffusion. This invention facilitates simpler calculation of the spatial concentration diffusion distribution of multiphase contaminant liquid leaks within high-pressure vessels. It can efficiently and accurately simulate and analyze the macroscopic jet behavior and the diffusion behavior of multiphase contaminant gas jets during the flash process. It is suitable for analyzing leaks of pollutants stored in liquid form in gasholders and gas tanks, facilitating emergency preparedness in petrochemical applications such as cooling and gasification, and providing guidance for emergency safety handling, thus possessing significant engineering significance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 This is a flow chart of the analysis method for the leakage and diffusion of pollutants in a high-pressure gas storage cabinet according to the present invention.

[0027] Figure 2 This is a dimensioned diagram of the high-pressure gas storage cabinet model in Example 1 of the present invention.

[0028] Figure 3 This is a diagram showing the pollutant concentration distribution in Example 1 of the present invention.

[0029] Figure 4 This is a diagram showing the particle size distribution of pollutants in Example 1 of the present invention.

[0030] Figure 5 This is a diagram showing the evaporation of pollutants under multiple sets of ambient temperatures in Example 1 of the present invention.

[0031] Figure 6 Graph showing the relationship between the flow rate and particle size of pollutants in Example 1 of the present invention.

[0032] Figure 7 This is a schematic structural diagram of an analysis system for leakage and diffusion of pollutants in a high-pressure gas storage cabinet according to a preferred embodiment of the present invention.

[0033] Figure 8 The figure shows the structure of an electronic device according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0034] The following description of exemplary embodiments of the present application is made in conjunction with the accompanying drawings, including various details of the embodiments of the present application to facilitate understanding. These details should be considered as merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the present application. Similarly, for the sake of clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0035] Obviously, the embodiments described are only part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0036] It should be noted that the terminals involved in the embodiments of the present application may include but are not limited to mobile phones, personal digital assistants (PDAs), wireless handheld devices, tablet computers, personal computers (PCs), MP3 players, MP4 players, wearable devices (for example, smart glasses, smart watches, smart bracelets, etc.), smart home appliances and other smart devices.

[0037] In this document, the term "and / or" simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0038] The present invention is described in further detail below with reference to the accompanying drawings: See also Figure 1The present invention provides a method for analyzing the leakage and diffusion of pollutants in high-pressure gas storage cabinets. The method is performed by a subject including, but not limited to, a high-pressure gas storage cabinet, a pressure storage tank, a pressure pipeline, and other environments suitable for the method. The method includes, but is not limited to, propane, carbon dioxide, and other substances with a relative density greater than air, which are gaseous at standard atmospheric pressure and room temperature and can be stored in a liquid form under pressure within the high-pressure gas storage cabinet. The method specifically comprises the following steps: Step 1: Obtain the physical parameters inside the high-pressure gas storage cabinet, the physical parameters outside the high-pressure gas storage cabinet, and the physical parameters inside and outside the high-pressure gas storage cabinet. The physical parameters outside the high-pressure gas storage cabinet include: ambient temperature, ambient pressure, and molecular weight of the leaked substance. The physical parameters inside the high-pressure gas storage cabinet include: temperature, saturation pressure of the substance at the temperature, constant-pressure specific heat at the temperature and saturation pressure, density, surface tension, boiling point temperature, and latent heat value at the boiling point temperature. The physical parameters inside and outside the high-pressure gas storage cabinet include: saturated vapor pressure within the temperature range from below the boiling point inside the high-pressure gas storage cabinet to the room temperature condition of interest.

[0039] Step 2: Based on the physical parameters inside the high-pressure gas storage cabinet, the physical parameters outside the high-pressure gas storage cabinet, and the physical parameters throughout the high-pressure gas storage cabinet, calculate the enthalpy of the superheat of the jet droplets when the high-pressure gas storage cabinet pollutants leak. The superheat of the jet droplets is calculated by taking the difference between the ambient temperature and the boiling point temperature, and then calculating the enthalpy corresponding to the heat of the jet droplets. The calculation method is the product of the superheat and the constant-pressure specific heat, that is:

[0040]

[0041] in, is the droplet temperature, is the saturation temperature, is the enthalpy released by the droplet due to the pressure change, is the constant-pressure specific heat of the droplet, Indicates superheat.

[0042] Step 3: Using the values calculated in Step 2, calculate the evaporation behavior during the leak. By subtracting the superheat enthalpy from the latent heat term, and using the boiling point as the initial jet temperature, the droplet heat transfer is converted from the pressure change upstream and downstream of the leak into a temperature change, simplifying the calculation of evaporation heat transfer.

[0043] The calculation equation for the temperature change during evaporation of the jet droplet is expressed as:

[0044]

[0045]

[0046] in, is the constant pressure specific heat of the droplet, h is the convective heat transfer coefficient, is the continuous phase temperature, is the droplet temperature, is the droplet surface area, is the latent heat of vaporization, Indicates superheat, represents the saturation temperature, represents the mass of the evaporated droplet, Indicates time.

[0047] The jet flash calculation method does not involve bubble nucleation during the flash process, so it does not have high requirements on the microscopic process of the leakage process but is more concerned with the macroscopic process. Therefore, the diffusion of pollutant leakage can be calculated more quickly.

[0048] Step 4: Use a PIV instrument to measure the particle size distribution near the leak under target conditions through a scaled-down experiment. Flow rate is determined by weighing the high-pressure gas storage tank before and after the leak over a specified period of time. Based on the flow rate and particle size distribution data obtained under target conditions through the scaled-down experiment, the RR (Rosin-Rammler) particle size distribution calculation method is used to calculate the required particle size distribution fitting parameters. A database is then established that maps the experimental data to the fitting parameter values, facilitating the selection of fitting parameters for flow rate and particle size distribution after an incident.

[0049] The RR particle size distribution calculation method is: droplet diameter With size less than The mass fraction of the droplets There are the following relationships:

[0050] Where n is the size distribution index. The larger the parameter, the more uniform the droplet size distribution. is the average droplet diameter, when When we obtain:

[0051] The main thing to do is to get the average diameter and size distribution index, then match the parameter values of the particle size distribution with the conditions under different leakage port sizes, and establish a database to facilitate the use of correct parameters.

[0052] Step 5: After a leak occurs, select physical property parameters according to Step 1 and calculate the evaporation and heat transfer process of the jet droplets when the high-pressure gas storage tank contaminant leaks. Particle size and flow rate data are selected using the flow rate and particle size distribution database measured in the scaled-down experiment in Step 4, using the measured mass of the high-pressure gas storage tank and the size of the leak over a certain period of time. CFD software is used to calculate the diffusion of contaminants under the target leak scenario and analyze the leak incident.

[0053] The present invention is described in further detail below through specific embodiments: Example 1: This embodiment provides a method for analyzing the leakage and diffusion of pollutants in a high-pressure gas storage cabinet, the execution subject of which is a pressure storage tank, such as Figure 2 As shown, the high-pressure gas storage cabinet leak is simplified to a wall leak at y = 0, and the leakage diffusion space is x * y * z = 1m * 4.5m * 1m. Propane has a higher density than air and is a gas at standard atmospheric pressure and room temperature. However, it can be stored as a liquid under pressure in a high-pressure gas storage cabinet. This method is applicable to pressure piping in this environment.

[0054] In this example, the analysis method for the leakage and diffusion of pollutants in a high-pressure gas storage cabinet specifically includes the following steps: S1. Obtain the external physical properties of the high-pressure gas storage cabinet under the leak condition, including both reference and experimental measurement. The external physical properties of the high-pressure gas storage cabinet include: ambient temperature, ambient pressure, and the molecular weight of the leaked substance. The external physical properties of the high-pressure gas storage cabinet are selected under operating conditions, most of which are room temperature. The density and molecular weight of the leaked substance at the specified ambient temperature and pressure can be found in a physical property manual.

[0055] The ambient temperature is 288K at room temperature, the pressure is one atmosphere, i.e. 0.1 MPa, and the substance selected is propane, which has a molecular weight of 44 at room temperature.

[0056] Obtain physical properties of the high-pressure gas storage tank, including by reference and experimental measurement. These physical properties include: temperature, saturation pressure of the substance at the specified temperature, specific heat at constant pressure at the specified temperature and saturation pressure, density, surface tension, boiling point, and latent heat at the specified boiling point. Here, temperature refers to the corresponding ambient temperature, and internal pressure refers to the saturated vapor pressure at the specified temperature.

[0057] At 288K, the saturated vapor pressure of propane is about 1Mpa. Take 1Mpa and the density as 510Kg / m 3 The specific heat at constant pressure is 2589 J / Kg·K, the boiling point temperature is 231 K, the surface tension can be approximately set to 0.0007 N / m, and the latent heat value at the boiling point temperature is 344650 J / Kg.

[0058] Obtain the physical properties of the inside and outside of the high-pressure gas storage cabinet, including reference and experimental measurement. The physical properties of the inside and outside of the high-pressure gas storage cabinet include: saturated vapor pressure in the temperature range from below the boiling point in the high-pressure gas storage cabinet to the room temperature condition of interest. The vapor pressure table can be in the form of linear interpolation. The temperature range is set to ensure that the values within the range can be found for the required temperature conditions. The required propane linear interpolation data are shown in Table 1.

[0059] Table 1 Linear interpolation of propane saturated vapor pressure

[0060] S2. Calculate the superheat and its corresponding enthalpy based on the obtained physical properties. The superheat of propane at 288K is the difference between the ambient temperature and the boiling point, which is 57K. The corresponding enthalpy is the product of the superheat and the specific heat at constant pressure, which is 147,573 J / Kg.

[0061] In S3, the flash process is simplified by deducting the superheat enthalpy from the latent heat term. Parameter settings primarily refer to the latent heat term and the initial jet temperature. The latent heat is 197,077 J / Kg. The initial jet temperature is set to the boiling point, or 231 K.

[0062] This step converts the evaporation heat transfer caused by the sudden pressure change into the evaporation behavior caused by temperature change under constant pressure flow. It simplifies the flow and heat transfer process between the upstream and downstream of the leakage port during the leakage of the high-pressure storage cabinet, pays more attention to the calculation downstream of the leakage port, and simplifies the calculation process.

[0063] S4, based on the scaled experiment, the flow rate and particle size distribution data of the leakage are measured, and the fitting parameters are calculated and a database is established. This embodiment uses an experimental situation as an example, that is, the leakage port size is 4mm in diameter. The leakage flow rate is 0.1kg / s, so no database is established. The jet concentration distribution of the leakage port is as follows Figure 3 As shown, from Figure 3 It can be seen that the model can calculate the concentration distribution of the jet well, and the model has good reference value qualitatively.

[0064] The flow rate can be calculated based on the quotient of the mass difference of the high-pressure gas storage cabinet before and after the leakage and the leakage time, while the particle size and distribution need to be measured using a PIV instrument to measure the particle size distribution of the pollutants within 1 cm of the axis of the leakage port, such as Figure 4 As shown. According to the particle size data obtained from the experiment, the RR distribution fitting parameter value is used, and a one-to-one correspondence between the experimental data and the fitting parameters is established. The flow rate and particle size data of the propane under the leakage condition are shown as follows: Figure 6 As shown, from Figure 6 It can be seen that this method can better fit the experimental results and be used for database establishment.

[0065] S5. Based on the above data, use CFD software to obtain relevant calculation results of pollutant diffusion under target leakage conditions to analyze the leakage accident. The calculation tools used include but are not limited to the commercial CFD software FLUENT. Figure 5 As shown in the figure, the evaporation diagrams under multiple sets of ambient temperatures corresponding to the flow rate and particle size are given. Figure 5 It can be seen that the calculation results can not only predict the concentration and velocity distribution, but also obtain the parameters related to the leakage trajectory and evaporation rate.

[0066] By using the analysis method for leakage and diffusion of pollutants in high-pressure gas storage cabinets of the present invention and setting reasonable boundary conditions, the flash evaporation process and diffusion process of multiphase flow pollutant gas leaking from high-pressure containers in liquid form into a low-pressure environment can be easily calculated, which is helpful for related industries to predict and analyze accidents.

[0067] Example 2: The present invention also provides a high-pressure gas storage cabinet pollutant leakage and diffusion analysis system, such as Figure 7 As shown, the system includes: a data acquisition module, a first calculation module, a second calculation module and an analysis module.

[0068] A data acquisition module, the data acquisition module is used to obtain physical property parameters inside the high-pressure gas storage cabinet, physical property parameters outside the high-pressure gas storage cabinet, and physical property parameters inside and outside the high-pressure gas storage cabinet; a first calculation module, configured to calculate a jet droplet evaporation heat transfer process when pollutants leak from the high-pressure gas storage cabinet based on physical parameters inside the high-pressure gas storage cabinet, physical parameters outside the high-pressure gas storage cabinet, and physical parameters that penetrate inside and outside the high-pressure gas storage cabinet; a second calculation module, which is used to obtain the flow rate and particle size distribution in the case of target leakage, calculate the fitting parameter value of the particle size distribution using the RR particle size distribution calculation method, and establish a flow rate and particle size distribution database; The analysis module is used to analyze the leakage and diffusion of pollutants in the high-pressure gas storage cabinet based on the jet droplet evaporation heat transfer process and the flow rate and particle size distribution database when the pollutants in the high-pressure gas storage cabinet leak.

[0069] It can be understood that the analysis system for leakage and diffusion of pollutants in high-pressure gas storage cabinets provided by the present invention corresponds to the analysis method for leakage and diffusion of pollutants in high-pressure gas storage cabinets provided by the aforementioned embodiments. The relevant technical features of the analysis system for leakage and diffusion of pollutants in high-pressure gas storage cabinets can refer to the relevant technical features of the analysis method for leakage and diffusion of pollutants in high-pressure gas storage cabinets, and will not be repeated here.

[0070] Another object of the present invention is to provide an electronic device, such as Figure 8As shown, it includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor executes the steps of the method for analyzing the leakage and diffusion of pollutants in a high-pressure gas storage cabinet.

[0071] The method for analyzing the leakage and diffusion of pollutants in a high-pressure gas storage cabinet comprises the following steps: Obtaining physical property parameters inside the high-pressure gas storage cabinet, physical property parameters outside the high-pressure gas storage cabinet, and physical property parameters inside and outside the high-pressure gas storage cabinet; Based on the physical parameters inside and outside the high-pressure gas storage cabinet, and the physical parameters inside and outside the high-pressure gas storage cabinet, the evaporation heat transfer process of the jet droplets when the pollutants leak from the high-pressure gas storage cabinet is calculated; Obtain the flow rate and particle size distribution under target leakage conditions, calculate the fitting parameter values of the particle size distribution using the RR particle size distribution calculation method, and establish a flow rate and particle size distribution database; The leakage and diffusion of pollutants in high-pressure gas storage cabinets are analyzed based on the jet droplet evaporation heat transfer process and the flow rate and particle size distribution database when pollutants leak from high-pressure gas storage cabinets.

[0072] A fourth object of the present invention is to provide a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the method for analyzing the leakage and diffusion of pollutants in a high-pressure gas storage cabinet.

[0073] The method for analyzing the leakage and diffusion of pollutants in a high-pressure gas storage cabinet comprises the following steps: Obtaining physical property parameters inside the high-pressure gas storage cabinet, physical property parameters outside the high-pressure gas storage cabinet, and physical property parameters inside and outside the high-pressure gas storage cabinet; Based on the physical parameters inside and outside the high-pressure gas storage cabinet, and the physical parameters inside and outside the high-pressure gas storage cabinet, the evaporation heat transfer process of the jet droplets when the pollutants leak from the high-pressure gas storage cabinet is calculated; Obtain the flow rate and particle size distribution under target leakage conditions, calculate the fitting parameter values of the particle size distribution using the RR particle size distribution calculation method, and establish a flow rate and particle size distribution database; The leakage and diffusion of pollutants in high-pressure gas storage cabinets are analyzed based on the jet droplet evaporation heat transfer process and the flow rate and particle size distribution database when pollutants leak from high-pressure gas storage cabinets.

[0074] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROMs, optical storage, etc.) containing computer-usable program code.

[0075] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0076] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0077] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered by the scope of protection of the claims of the present invention.

Claims

1. A method for analyzing the leakage and diffusion of pollutants in a high-pressure gas storage cabinet, characterized in that: include: Obtaining physical property parameters inside the high-pressure gas storage cabinet, physical property parameters outside the high-pressure gas storage cabinet, and physical property parameters inside and outside the high-pressure gas storage cabinet; Based on the physical parameters inside and outside the high-pressure gas storage cabinet, and the physical parameters inside and outside the high-pressure gas storage cabinet, the evaporation heat transfer energy of the jet droplets when the pollutants leak from the high-pressure gas storage cabinet is calculated; Obtain the flow rate and particle size distribution under target leakage conditions, calculate the fitting parameter values of the particle size distribution using the RR particle size distribution calculation method, and establish a flow rate and particle size distribution database; The leakage and diffusion of pollutants in high-pressure gas storage cabinets are analyzed based on the database of jet droplet evaporation heat transfer energy, flow rate and particle size distribution when pollutants leak from high-pressure gas storage cabinets.

2. The method for analyzing the leakage and diffusion of pollutants in a high-pressure gas storage cabinet according to claim 1, characterized in that: The physical properties of the high-pressure gas storage cabinet include: temperature, saturation pressure of the substance, specific heat at constant pressure, density, surface tension, boiling point and latent heat value; The external physical parameters of the high-pressure gas storage cabinet include: ambient temperature, ambient pressure and molecular weight of the leaked substance; The physical property parameter that penetrates the inside and outside of the high-pressure gas storage cabinet is the saturated vapor pressure within the temperature range from lower than the boiling point inside the high-pressure gas storage cabinet to room temperature.

3. The method for analyzing the leakage and diffusion of pollutants in a high-pressure gas storage cabinet according to claim 1, characterized in that: The calculation method of the heat transfer energy of the jet droplet evaporation when the high-pressure gas storage cabinet pollutants leak is: Calculate the enthalpy of superheat of jet droplets when pollutants leak from the high-pressure gas storage cabinet based on the physical parameters inside and outside the high-pressure gas storage cabinet and the physical parameters inside and outside the high-pressure gas storage cabinet; Based on the enthalpy of the droplet superheat, the temperature change during the evaporation of the jet droplet when the pollutant leaks from the high-pressure gas storage cabinet is calculated.

4. The method for analyzing the leakage and diffusion of pollutants in a high-pressure gas storage cabinet according to claim 3 is characterized in that: The calculation method of the enthalpy value of the jet droplet superheat is: in, is the droplet temperature, is the saturation temperature, is the enthalpy released by the droplet due to pressure change, is the constant-pressure specific heat of the droplet, For superheat.

5. The method for analyzing the leakage and diffusion of pollutants in a high-pressure gas storage cabinet according to claim 3 is characterized in that: The calculation method of the temperature change when the jet droplets evaporate is: in, is the constant pressure specific heat of the droplet, h is the convective heat transfer coefficient, is the continuous phase temperature, is the droplet temperature, is the droplet surface area, is the latent heat of vaporization, is the superheat, is the saturation temperature, is the mass of the evaporated droplet, For time.

6. The method for analyzing the leakage and diffusion of pollutants in a high-pressure gas storage cabinet according to claim 1, characterized in that: The particle size distribution under the target leakage condition is measured at the leakage port through a scaled experiment using a PIV instrument; the flow rate under the target leakage condition is measured by weighing the high-pressure gas storage cabinet before and after the leakage within a certain period of time.

7. The method for analyzing the leakage and diffusion of pollutants in a high-pressure gas storage cabinet according to claim 1, characterized in that: The RR particle size distribution calculation method is: in, It represents the mass fraction of droplets smaller than the droplet diameter, n is the size distribution index, is the droplet diameter, is the average droplet diameter.

8. A high-pressure gas storage cabinet pollutant leakage and diffusion analysis system, characterized in that: include: A data acquisition module, the data acquisition module is used to obtain physical property parameters inside the high-pressure gas storage cabinet, physical property parameters outside the high-pressure gas storage cabinet, and physical property parameters inside and outside the high-pressure gas storage cabinet; a first calculation module, configured to calculate a jet droplet evaporation heat transfer process when pollutants leak from the high-pressure gas storage cabinet based on physical parameters inside the high-pressure gas storage cabinet, physical parameters outside the high-pressure gas storage cabinet, and physical parameters that penetrate inside and outside the high-pressure gas storage cabinet; a second calculation module, which is used to obtain the flow rate and particle size distribution in the case of target leakage, calculate the fitting parameter value of the particle size distribution using the RR particle size distribution calculation method, and establish a flow rate and particle size distribution database; The analysis module is used to analyze the leakage and diffusion of pollutants in the high-pressure gas storage cabinet based on the jet droplet evaporation heat transfer process and the flow rate and particle size distribution database when the pollutants in the high-pressure gas storage cabinet leak.

9. A terminal device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 7 are implemented.

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