Method and device for determining gas-liquid phase transition temperature of mixed gas containing perfluoroisobutyronitrile, computer equipment and storage medium

Abstract

The invention relates to the field of insulating materials, and discloses a method and device for determining the gas-liquid phase transition temperature of mixed gas containing perfluoroisobutyronitrile, computer equipment and a storage medium, and the method comprises the following steps: obtaining composition data of the mixed gas and first physical property data of perfluoroisobutyronitrile; determining second physical property data of the buffer gas according to the composition data; the buffer gas is all gas components except the perfluoroisobutyronitrile in the mixed gas; inputting the first physical property data and the second physical property data into a binary gas-liquid phase change temperature calculation model; and solving the binary gas-liquid phase change model through an iteration method to obtain the gas-liquid phase change temperature of the mixed gas. According to the method, the binary gas-liquid phase change temperature calculation model is adopted to calculate the gas-liquid phase change temperature of the mixed gas containing the perfluoroisobutyronitrile, the thermodynamic law is met, the prediction precision is high, the calculation efficiency is high, the calculation complexity of a multivariate model is greatly reduced, the experimental data calibration quantity is reduced, and the engineering real-time requirement is met.

Description

Technical Field

[0001] The present invention relates to the field of insulating materials, and in particular to a method, device, computer equipment and storage medium for determining the gas-liquid phase transition temperature of a mixed gas containing perfluoroisobutyronitrile. Background Art

[0002] Perfluoroisobutyronitrile (PFIBN) (also known as heptafluoroisobutyronitrile) is a new, environmentally friendly insulating gas material with a low boiling point, high volatility, excellent electrical insulation properties, and good environmental performance. It is a key component of electrical equipment insulators. However, when PFIBN is mixed with gases such as carbon dioxide and nitrogen, the differences in the melting and boiling points of the various components of the mixed gas can cause the PFIB to undergo phase changes (e.g., to liquid or solid) when used as a mixed gas, affecting the component ratios of the mixed gas and, in turn, the electrical properties of the mixed gas. In particular, the gas-liquid phase transition temperature of the mixed gas (including the bubble point temperature—the temperature at which the liquid begins to vaporize—and the dew point temperature—the temperature at which the gas begins to liquefy) are key parameters for evaluating the low-temperature operating limits of the mixed gas.

[0003] Existing calculation methods for obtaining the gas-liquid phase transition temperature of perfluoroisobutyronitrile-containing mixed gases (such as the equation of state method and the activity coefficient method) require iterative solution of multi-component phase equilibrium equations, have high computational complexity, and rely on a large amount of experimental data to calibrate interaction parameters, making it difficult to meet the real-time requirements of engineering. Summary of the Invention

[0004] Embodiments of the present invention provide a method, apparatus, computer equipment, and storage medium for determining the gas-liquid phase transition temperature of a perfluoroisobutyronitrile-containing gas mixture, thereby reducing the cost of obtaining the gas-liquid phase transition temperature of the perfluoroisobutyronitrile-containing gas mixture and improving the efficiency of obtaining the temperature.

[0005] A method for determining the gas-liquid phase transition temperature of a perfluoroisobutyronitrile-containing gas mixture, comprising: Obtaining composition data of the mixed gas and first physical property data of perfluoroisobutyronitrile; Determining second physical property data of a buffer gas based on the composition data; the buffer gas is all gas components in the mixed gas except perfluoroisobutyronitrile; inputting the first physical property data and the second physical property data into a binary gas-liquid phase transition temperature calculation model; The binary gas-liquid phase transition model is solved by an iterative method to obtain the gas-liquid phase transition temperature of the mixed gas.

[0006] Optionally, the binary gas-liquid phase transition temperature calculation model includes a dew point temperature calculation model, and the dew point temperature calculation model includes: in, is the mole fraction of perfluoroisobutyronitrile; Perfluoroisobutyronitrile at dew point temperature Saturated vapor pressure under is the mole fraction of the buffer gas; The buffer gas is at the dew point temperature Saturated vapor pressure under is the total pressure of the mixed gas; is the dew point temperature.

[0007] Optionally, solving the binary gas-liquid phase transition model by an iterative method to obtain the gas-liquid phase transition temperature of the mixed gas includes: Define the residual function : ; Where T is the dew point temperature to be solved; By iterating Approaching zero.

[0008] Optionally, Newton's iterative formula is used to Iterate; the Newton iteration formula includes: in, is the k+1th iteration temperature; is the k-th iteration temperature; for exist The derivative at .

[0009] Optionally, Through the derivative function Solution; It can be expressed as: in, It is the second antoin factor of perfluoroisobutyronitrile; It is the third antoin factor of perfluoroisobutyronitrile; is the second Antoine factor of the buffer gas; is the third Antoine factor of the buffer gas.

[0010] Optionally, the binary gas-liquid phase transition temperature calculation model includes a bubble point temperature calculation model, and the bubble point temperature calculation model includes: in, is the mole fraction of the i-th component; is the calibrated relative volatility ratio of perfluoroisobutyronitrile and buffer gas; For the i-th component Saturated vapor pressure under is the total pressure of the mixed gas; n is 2.

[0011] Optionally, solving the binary gas-liquid phase transition model by an iterative method to obtain the gas-liquid phase transition temperature of the mixed gas includes: Define the residual function : in, is the bubble point temperature to be solved; By iterating Approaching zero.

[0012] A device for determining the gas-liquid phase transition temperature of a mixed gas containing perfluoroisobutyronitrile, comprising: an acquisition module, for acquiring composition data of the mixed gas and first physical property data of perfluoroisobutyronitrile; A second physical property data acquisition module is used to determine second physical property data of a buffer gas according to the composition data; the buffer gas is all gas components in the mixed gas except perfluoroisobutyronitrile; A model input module, configured to input the first physical property data and the second physical property data into a binary gas-liquid phase transition temperature calculation model; The temperature calculation module is used to solve the binary gas-liquid phase transition model through an iterative method to obtain the gas-liquid phase transition temperature of the mixed gas.

[0013] A computer device comprises a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the method for determining the gas-liquid phase transition temperature of a mixed gas containing perfluoroisobutyronitrile is implemented.

[0014] A computer-readable storage medium stores a computer program, which, when executed by a processor, implements the method for determining the gas-liquid phase transition temperature of a mixed gas containing perfluoroisobutyronitrile.

[0015] The above-mentioned method, device, computer equipment and storage medium for determining the gas-liquid phase transition temperature of a mixed gas containing perfluoroisobutyronitrile adopt a binary gas-liquid phase transition temperature calculation model to calculate the gas-liquid phase transition temperature of a mixed gas containing perfluoroisobutyronitrile, conforming to the laws of thermodynamics, with high prediction accuracy and high computational efficiency, greatly reducing the computational complexity of the multivariate model, reducing the amount of experimental data calibration, and meeting the real-time requirements of the engineering. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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 description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0017] Figure 1 is a flow chart of a method for determining the gas-liquid phase transition temperature of a mixed gas containing perfluoroisobutyronitrile in one embodiment of the present invention; Figure 2 1 is a schematic diagram of an apparatus for determining the gas-liquid phase transition temperature of a mixed gas containing perfluoroisobutyronitrile in one embodiment of the present invention; Figure 3 FIG. 1 is a schematic diagram of a computer device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0019] In one embodiment, if Figure 1 As shown, a method for determining the gas-liquid phase transition temperature of a mixed gas containing perfluoroisobutyronitrile is provided, comprising: S10, obtaining composition data of the mixed gas and first physical property data of perfluoroisobutyronitrile; S20, determining second physical property data of a buffer gas based on the composition data; the buffer gas is all gas components in the mixed gas except perfluoroisobutyronitrile; S30, inputting the first physical property data and the second physical property data into a binary gas-liquid phase transition temperature calculation model; S40. Solve the binary gas-liquid phase transition model by an iterative method to obtain the gas-liquid phase transition temperature of the mixed gas.

[0020] Understandably, the mixed gas refers to a gas mixture containing perfluoroisobutyronitrile. The mixed gas can be a mixture of perfluoroisobutyronitrile and carbon dioxide, nitrogen, oxygen, etc. The composition data of the mixed gas refers to the proportion of each component in the mixed gas, which can be a percentage, or a mole fraction, gas partial pressure, etc. The first physical property data of perfluoroisobutyronitrile refers to the physical parameters related to the gas-liquid phase transition temperature, such as the Antoine coefficient used to calculate the saturated vapor pressure of perfluoroisobutyronitrile, or the relative volatility data related to perfluoroisobutyronitrile.

[0021] The gas mixture can be simplified as a binary system consisting of perfluoroisobutyronitrile and a buffer gas. The buffer gas consists of all gas components except perfluoroisobutyronitrile. Based on the composition data, the composition of the buffer gas can be determined and secondary physical properties of the buffer gas can be obtained. These secondary physical properties refer to physical parameters of the buffer gas related to the gas-liquid phase transition temperature, such as the saturated vapor pressure of the buffer gas.

[0022] The binary gas-liquid phase transition temperature calculation model refers to a mathematical model used to calculate the gas-liquid phase transition temperature of a mixed gas. In some examples, the binary gas-liquid phase transition temperature calculation model includes a dew point temperature calculation model and a bubble point temperature calculation model. The first physical property data and the second physical property data can be input into the binary gas-liquid phase transition temperature calculation model, and the gas-liquid phase transition temperature of the mixed gas can be obtained by solving the binary gas-liquid phase transition temperature calculation model. Here, an iterative method can be used to solve the binary gas-liquid phase transition temperature calculation model, such as the Newton iteration method. The Newton iteration method uses Taylor expansion and derivative information to approximate the extreme point and has a fast convergence speed. The calculated gas-liquid phase transition temperature includes the dew point temperature and / or the bubble point temperature.

[0023] This embodiment uses a binary gas-liquid phase transition temperature calculation model to calculate the gas-liquid phase transition temperature of a mixed gas containing perfluoroisobutyronitrile. This model complies with the laws of thermodynamics, has high prediction accuracy and high computational efficiency, greatly reduces the computational complexity of the multivariate model, reduces the amount of experimental data calibration, and meets the real-time requirements of the project.

[0024] Optionally, the binary gas-liquid phase transition temperature calculation model includes a dew point temperature calculation model, and the dew point temperature calculation model includes: in, is the mole fraction of perfluoroisobutyronitrile; Perfluoroisobutyronitrile at dew point temperature Saturated vapor pressure under is the mole fraction of the buffer gas; The buffer gas is at the dew point temperature Saturated vapor pressure under is the total pressure of the mixed gas; is the dew point temperature.

[0025] Understandably, the dew point temperature ( ) is the total pressure of the mixed gas at P total The temperature at which condensation begins. The relationship between the vapor pressure of a single component and temperature can be expressed by the Antoine equation, that is: Where P is the saturated vapor pressure of pure liquid corresponding to temperature T, in MPa; A is the first Antoine factor, dimensionless, related to the base value of the vapor pressure of the substance, reflecting the strength of the intermolecular force; B is the second Antoine factor, dimensionless, related to the latent heat of evaporation. The larger the value, the more significant the effect of temperature on vapor pressure. C is the third Antoine factor, a dimensionless, empirical constant used to adjust the temperature offset; T is temperature in °C.

[0026] The first physical property data includes the values ​​of the three Antoine factors of perfluoroisobutyronitrile (determined through experimental data), and the second physical property data includes the values ​​of the three Antoine factors of the buffer gas. is the mole fraction of perfluoroisobutyronitrile, is the mole fraction of the buffer gas, .

[0027] The nonlinear equations are solved numerically and iteratively to determine .

[0028] Optionally, solving the binary gas-liquid phase transition model by an iterative method to obtain the gas-liquid phase transition temperature of the mixed gas includes: Define the residual function : ; Where T is the dew point temperature to be solved; By iterating Approaching zero.

[0029] Understandably, the residual function can be defined as , the Newton iteration method is used to iterate the residual function. Perfluoroisobutyronitrile is the high boiling point component in the mixed gas, and the dew point temperature is dominated by it. Therefore, the dew point temperature T of pure perfluoroisobutyronitrile can be d0 As the starting point for iteration.

[0030] Optionally, Newton's iterative formula is used to Iterate; the Newton iteration formula includes: in, is the k+1th iteration temperature; is the k-th iteration temperature; for exist The derivative at .

[0031] Understandably, The calculation can be performed by numerical difference or analytical derivation. During the iteration process, the convergence condition can be set according to the actual situation. In one example, the convergence condition includes: the temperature change |T k+1 −T k ∣ is the temperature threshold, which can be set according to actual needs, such as 0.1K; the number of iterations is less than or equal to the preset number, such as 5.

[0032] Optionally, Through the derivative function Solution; It can be expressed as: in, It is the second antoin factor of perfluoroisobutyronitrile; It is the third antoin factor of perfluoroisobutyronitrile; is the second Antoine factor of the buffer gas; is the third Antoine factor of the buffer gas.

[0033] Understandably, is the iteration step size. If it is too large, the damped Newton method or limiting the temperature change range (such as |ΔT|≤10 ℃) can be used for correction.

[0034] In one application example, the mixed gas is C4F7N / CO2 (molar ratio 7:3) with a total pressure of 0.5 MPa, wherein the CO2 is doped with O2.

[0035] The second physical property parameter of the buffer gas can be the weighted value of the physical property parameters of each component of the buffer gas. For example, if the CO2 mole fraction is 0.3, the Antoine coefficient of the buffer gas can be: A eq =0.3A CO2 +0.05A O2 , and the rest of the parameters are the same.

[0036] The Antoine coefficient of C4F7N is A=6.2; B=1200; C=220; The Antoine coefficients of CO2 are A=6.8; B=900; C=240; Substituting the dew point temperature into the calculation model, the initial value T0 is obtained as -20℃.

[0037] The saturated vapor pressure of C4F7N is calculated with T0=-20℃ as the initial value: ; The saturated vapor pressure of CO2 is: .

[0038] Substituting into the residual function we get: Compute the derivative: Update temperature: Because the first iteration step size is too large, the damped Newton method can be used or the temperature change amplitude can be limited (such as |ΔT| < 10°C). After correction, T1 = -30.0°C.

[0039] Take T1=-30.0℃ and continue iterating; ; ; ; Update temperature: .

[0040] Iterate in the above manner until |ΔT| < 0.1°C, and the dew point temperature is obtained as -39.63°C.

[0041] Optionally, the binary gas-liquid phase transition temperature calculation model includes a bubble point temperature calculation model, and the bubble point temperature calculation model includes: in, is the mole fraction of the i-th component; is the calibrated relative volatility ratio of perfluoroisobutyronitrile and buffer gas; For the i-th component Saturated vapor pressure under is the total pressure of the mixed gas; n is 2.

[0042] Understandably, the above bubble point temperature calculation model is applicable to low- to medium-pressure systems with weak non-idealities, where the relative volatility changes little with temperature. In order to calibrate the relative volatility ratio of perfluoroisobutyronitrile to the buffer gas, the applicable relative volatility under different conditions can be stored in a preset data table and obtained by looking up the table when needed. It can be calculated by the following formula: Optionally, solving the binary gas-liquid phase transition model by an iterative method to obtain the gas-liquid phase transition temperature of the mixed gas includes: Define the residual function : in, is the bubble point temperature to be solved; By iterating Approaching zero.

[0043] Understandably, when iterating the residual function When the physical parameters are input, the composition of the mixed gas (x i ), total pressure P total , Pre-store Data table. The initial temperature can be taken as the boiling point of pure C4F7N.

[0044] By adjusting the temperature Until <Convergence threshold: The convergence threshold can be set according to actual needs, such as 0.001.

[0045] During the iterative calculation process, a piecewise linear interpolation method can be used to pre-generate the Antoine coefficient-temperature lookup table. The convergence conditions include the number of iterations ≤ 5 and the temperature convergence threshold set to ±0.1K.

[0046] In an application example, calling the pre-stored α C4F7N−CO2 =0.12, directly solve the simplified equation to get T b =−40.2℃.

[0047] Input C4F7N / CO2 (7:3), P total =0.5 MPa, Antoine coefficient: C4F7N (A=6.2, B=1200, C=220), CO2 (A=6.8, B=900, C=240) pre-calibrated α C4F7N-CO2 =0.12.

[0048] Substitute the initial temperature T0 = −20°C into the residual function In the residual =0.15.

[0049] In the first iteration, T1 = −30°C is substituted into the residual function In, Δ =0.08.

[0050] In the second iteration, T2 = −38°C is substituted into the residual function In, Δ =0.005.

[0051] In the third iteration, T3 = −40.2°C is substituted into the residual function In, Δ =0.0003 (meets the convergence condition).

[0052] Finally output the bubble point temperature T b =−40.2℃, and the bubble point temperature deviates by 0.5℃ from the traditional method.

[0053] It should be understood that the size of the serial numbers of the steps in the above embodiments does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0054] In one embodiment, a device for determining the gas-liquid phase transition temperature of a mixed gas containing perfluoroisobutyronitrile is provided. The device for determining the gas-liquid phase transition temperature of a mixed gas containing perfluoroisobutyronitrile corresponds one-to-one to the method for determining the gas-liquid phase transition temperature of a mixed gas containing perfluoroisobutyronitrile in the above embodiment. Figure 2 As shown, the device for determining the gas-liquid phase transition temperature of a mixed gas containing perfluoroisobutyronitrile comprises: An acquisition module 10 is used to acquire composition data of the mixed gas and first physical property data of perfluoroisobutyronitrile; A second physical property data acquisition module 20 is configured to determine second physical property data of a buffer gas according to the composition data; the buffer gas is all gas components in the mixed gas except perfluoroisobutyronitrile; A model input module 30, configured to input the first physical property data and the second physical property data into a binary gas-liquid phase transition temperature calculation model; The temperature calculation module 40 is used to solve the binary gas-liquid phase transition model through an iterative method to obtain the gas-liquid phase transition temperature of the mixed gas.

[0055] Optionally, the binary gas-liquid phase transition temperature calculation model includes a dew point temperature calculation model, and the dew point temperature calculation model includes: in, is the mole fraction of perfluoroisobutyronitrile; Perfluoroisobutyronitrile at dew point temperature Saturated vapor pressure under is the mole fraction of the buffer gas; The buffer gas is at the dew point temperature Saturated vapor pressure under is the total pressure of the mixed gas; is the dew point temperature.

[0056] Optionally, the temperature calculation module 40 is further configured to: Define the residual function : ; Where T is the dew point temperature to be solved; By iterating Approaching zero.

[0057] Optionally, the temperature calculation module 40 is further configured to: Newton's iterative formula Iterate; the Newton iteration formula includes: in, is the k+1th iteration temperature; is the k-th iteration temperature; for exist The derivative at .

[0058] Optionally, the temperature calculation module 40 is further configured to: Through the derivative function Solution; It can be expressed as: in, It is the second antoin factor of perfluoroisobutyronitrile; It is the third antoin factor of perfluoroisobutyronitrile; is the second Antoine factor of the buffer gas; is the third Antoine factor of the buffer gas.

[0059] Optionally, the binary gas-liquid phase transition temperature calculation model includes a bubble point temperature calculation model, and the bubble point temperature calculation model includes: in, is the mole fraction of the i-th component; is the calibrated relative volatility ratio of perfluoroisobutyronitrile and buffer gas; For the i-th component Saturated vapor pressure under is the total pressure of the mixed gas; n is 2.

[0060] Optionally, the temperature calculation module 40 is further configured to: Define the residual function : in, is the bubble point temperature to be solved; By iterating Approaching zero.

[0061] The specific definition of the apparatus for determining the gas-liquid phase transition temperature of a perfluoroisobutyronitrile-containing gas mixture can be found in the definition of the method for determining the gas-liquid phase transition temperature of a perfluoroisobutyronitrile-containing gas mixture described above and will not be further elaborated here. Each module of the apparatus for determining the gas-liquid phase transition temperature of a perfluoroisobutyronitrile-containing gas mixture described above can be implemented in whole or in part via software, hardware, or a combination thereof. Each of these modules can be embedded in or independent of a processor in a computer device in hardware form, or stored in a computer device memory in software form, allowing the processor to call and execute the corresponding operations of each module.

[0062] In one embodiment, a computer device is provided. The computer device may be a server, and its internal structure diagram may be as follows: Figure 3 As shown. The computer device includes a processor, a memory, a network interface and a database connected via a system bus. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store data related to a method for determining the gas-liquid phase transition temperature of a mixed gas containing perfluoroisobutyronitrile. The network interface of the computer device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, a method for determining the gas-liquid phase transition temperature of a mixed gas containing perfluoroisobutyronitrile is implemented.

[0063] In one embodiment, a computer device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the method for determining the gas-liquid phase transition temperature of a perfluoroisobutyronitrile-containing gas mixture described in the above-described embodiment. To avoid repetition, this description is omitted. Alternatively, when the processor executes the computer program, it implements the functions of the various modules / units described in the embodiment of the apparatus for determining the gas-liquid phase transition temperature of a perfluoroisobutyronitrile-containing gas mixture. To avoid repetition, this description is omitted.

[0064] In one embodiment, a computer-readable storage medium is provided, storing a computer program. When executed by a processor, the computer program implements the method for determining the gas-liquid phase transition temperature of a perfluoroisobutyronitrile-containing gas mixture described in the above-described embodiment. To avoid repetition, this description is omitted. Alternatively, when executed by a processor, the computer program implements the functions of the various modules / units of the apparatus for determining the gas-liquid phase transition temperature of a perfluoroisobutyronitrile-containing gas mixture described in the above-described embodiment. To avoid repetition, this description is omitted.

[0065] Those skilled in the art will understand that all or part of the processes in the above-mentioned embodiments can be implemented by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in this application may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0066] Those skilled in the art will clearly understand that for the sake of convenience and brevity of description, only the division of the above-mentioned functional units and modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above.

[0067] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. A method for determining the gas-liquid phase transition temperature of a mixed gas containing perfluoroisobutyronitrile, characterized in that: include: Obtaining composition data of the mixed gas and first physical property data of perfluoroisobutyronitrile; Determining second physical property data of a buffer gas based on the composition data; the buffer gas is all gas components in the mixed gas except perfluoroisobutyronitrile; inputting the first physical property data and the second physical property data into a binary gas-liquid phase transition temperature calculation model; The binary gas-liquid phase transition model is solved by an iterative method to obtain the gas-liquid phase transition temperature of the mixed gas.

2. The method for determining the gas-liquid phase transition temperature of a mixed gas containing perfluoroisobutyronitrile according to claim 1, wherein: The binary gas-liquid phase transition temperature calculation model includes a dew point temperature calculation model, and the dew point temperature calculation model includes: in, is the mole fraction of perfluoroisobutyronitrile; Perfluoroisobutyronitrile at dew point temperature Saturated vapor pressure under is the mole fraction of the buffer gas; The buffer gas is at the dew point temperature Saturated vapor pressure under is the total pressure of the mixed gas.

3. The method for determining the gas-liquid phase transition temperature of a mixed gas containing perfluoroisobutyronitrile according to claim 2, wherein: Solving the binary gas-liquid phase transition model by an iterative method to obtain the gas-liquid phase transition temperature of the mixed gas includes: Define the residual function : ; Where T is the dew point temperature to be solved; By iterating Approaching zero.

4. The method for determining the gas-liquid phase transition temperature of a mixed gas containing perfluoroisobutyronitrile according to claim 3, wherein: Newton's iterative formula Iteration is performed; the Newton iteration formula includes: in, is the k+1th iteration temperature; is the k-th iteration temperature; for exist The derivative at .

5. The method for determining the gas-liquid phase transition temperature of a mixed gas containing perfluoroisobutyronitrile according to claim 4, wherein: Through the derivative function Solution; It can be expressed as: in, It is the second antoin factor of perfluoroisobutyronitrile; It is the third antoin factor of perfluoroisobutyronitrile; is the second Antoine factor of the buffer gas; The third Antoine factor for the buffer gas; T is the temperature variable.

6. The method for determining the gas-liquid phase transition temperature of a mixed gas containing perfluoroisobutyronitrile according to claim 1, wherein: The binary gas-liquid phase transition temperature calculation model includes a bubble point temperature calculation model, which includes: in, is the mole fraction of the i-th component; is the calibrated relative volatility ratio of perfluoroisobutyronitrile and buffer gas; For the i-th component Saturated vapor pressure under is the total pressure of the mixed gas; n is 2.

7. The method for determining the gas-liquid phase transition temperature of a mixed gas containing perfluoroisobutyronitrile according to claim 6, wherein: Solving the binary gas-liquid phase transition model by an iterative method to obtain the gas-liquid phase transition temperature of the mixed gas includes: Define the residual function : in, is the bubble point temperature to be solved; By iterating Approaching zero.

8. A device for determining the gas-liquid phase transition temperature of a mixed gas containing perfluoroisobutyronitrile, characterized in that: include: An acquisition module, used to acquire composition data of the mixed gas and first physical property data of perfluoroisobutyronitrile; A second physical property data acquisition module is used to determine second physical property data of a buffer gas according to the composition data; the buffer gas is all gas components in the mixed gas except perfluoroisobutyronitrile; A model input module, configured to input the first physical property data and the second physical property data into a binary gas-liquid phase transition temperature calculation model; The temperature calculation module is used to solve the binary gas-liquid phase transition model through an iterative method to obtain the gas-liquid phase transition temperature of the mixed gas.

9. A computer 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 method for determining the gas-liquid phase transition temperature of a mixed gas containing perfluoroisobutyronitrile according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method for determining the gas-liquid phase transition temperature of a mixed gas containing perfluoroisobutyronitrile according to any one of claims 1 to 7 is implemented.

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