Dew point temperature measuring method and system for mixed gas containing perfluoroisobutyronitrile

Abstract

The invention discloses a dew point temperature measuring method and system for mixed gas containing perfluoroisobutyronitrile, and relates to the technical field of power switchs.The method comprises the steps that a pressure container is vacuumized, and the perfluoroisobutyronitrile mixed gas in a specific proportion is inflated through an inflation device; measuring initial pressure and temperature by using an air pressure sensor and a temperature sensor to obtain an initial condition pressure-temperature ratio; the temperature of the temperature control box is adjusted, and the real-time pressure-temperature ratio is obtained; continuously reducing the temperature until the real-time pressure-temperature ratio is smaller than the initial condition to obtain the dew-point temperature; according to the invention, accurate temperature control and real operation condition simulation are facilitated, and the measurement accuracy is ensured; the reliability of a measurement result is improved; the experiment process is simplified, and the efficiency is improved; the dew-point temperature can be measured without a gas chromatograph, the cost and the operation difficulty are reduced, the dew-point air pressure change in the operation process of the power equipment is simulated, and the evaluation of the actual application performance is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of power switches, and in particular to a method and system for measuring the dew point temperature of a mixed gas containing perfluoroisobutyronitrile. Background Art

[0002] In the field of power switches, although SF 6 Gas has excellent insulation and arc extinguishing properties, but SF 6 Gas has a strong greenhouse gas effect. In the past decade, the insulation and disconnection technology using environmentally friendly mixed gases with low greenhouse gas potential (GWP) has made significant progress and is expected to replace SF in the near future. 6 Power switchgear. In many SF 6 Among the alternative gases, low GWP perfluoroisobutyronitrile mixed gas (C4F7N mixed gas) is currently the best performing alternative gas. The dew point characteristic, i.e., the saturated vapor pressure-temperature characteristic, is one of the most important physical characteristics of the perfluoroisobutyronitrile mixed gas, which determines the maximum gas filling pressure of the mixed gas and the corresponding perfluoroisobutyronitrile gas content of the power switchgear within a given operating temperature range. Since the perfluoroisobutyronitrile molecule has a high boiling point, in order to avoid the condensation of perfluoroisobutyronitrile gas at a lower operating temperature, it is necessary to measure the dew point characteristics (dew point pressure and temperature) of the mixed gas of perfluoroisobutyronitrile and the corresponding natural gas under a certain total gas filling pressure condition.

[0003] Perfluoroisobutyronitrile is a synthetic molecule with a complex molecular structure. It has never been used before it was applied to high-voltage power equipment. Although the content of perfluoroisobutyronitrile gas used in high-voltage power equipment is low, the presence of perfluoroisobutyronitrile makes the properties of the mixed gas deviate from the ideal gas state model. Therefore, for the ternary mixed gas C containing perfluoroisobutyronitrile 4 F 7 N / CO 2 / O 2 , C 4 F 7 N / N 2 / O 2, within the typical operating pressure range of 5-11 bar required by high-voltage power equipment, it is necessary to establish an accurate real gas model, on which the Wagner equation for calculating the dew point curve of the perfluoroisobutyronitrile mixed gas is obtained to calculate the dew point pressure of any given ratio of perfluoroisobutyronitrile mixed gas at a certain dew point temperature. In order to establish and verify the dew point curve equation, it is usually necessary to carry out a vapor-liquid equilibrium test experiment (vapor liquid equilibrium test), which requires the use of gas chromatography to measure the concentration of gas-phase perfluoroisobutyronitrile under given temperature and pressure conditions, in order to establish a dew point pressure-dew point temperature curve under different perfluoroisobutyronitrile concentrations (local pressure ratio) conditions. However, the vapor-liquid equilibrium test method is used to establish and verify the dew point curve of the gas under study. Gas chromatography is required to measure the concentration of gas-phase perfluoroisobutyronitrile under given temperature and pressure conditions. Gas chromatography requires sample pretreatment and separation, which increases the complexity and cost of the experiment, resulting in a long experimental process, which is not conducive to rapid data acquisition or testing of a large number of samples. In addition, the purchase and maintenance costs of the equipment are relatively high, and precise control of temperature, pressure and other conditions is required, which increases the complexity of the operation. Summary of the invention

[0004] In view of the above-mentioned problems, the present invention is proposed.

[0005] Therefore, the technical problem solved by the present invention is: how to measure the dew point temperature characteristics of various perfluoroisobutyronitrile mixed gases without the aid of a gas chromatograph and simulate the change process of the dew point pressure of perfluoroisobutyronitrile mixed gas power equipment during the process of temperature drop during operation.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] In a first aspect, an embodiment of the present invention provides a method for measuring the dew point temperature of a mixed gas containing perfluoroisobutyronitrile, comprising:

[0008] The pressure vessel is evacuated, and a mixed gas containing perfluoroisobutyronitrile in a test proportion is charged into the pressure vessel through a charging device;

[0009] The initial pressure value and the initial temperature value in the pressure vessel are measured by a pressure sensor and a temperature sensor to obtain the initial condition pressure-temperature ratio;

[0010] Adjust the temperature of the temperature control box to obtain the real-time pressure-temperature ratio;

[0011] Continue to lower the temperature until the real-time pressure-temperature ratio is less than the initial pressure-temperature ratio to obtain the dew point temperature.

[0012] As a preferred solution of the method for measuring the dew point temperature of a mixed gas containing perfluoroisobutyronitrile, wherein:

[0013] The perfluoroisobutyronitrile mixed gas filled into the test ratio includes:

[0014] After the test proportion of the mixed gas containing perfluoroisobutyronitrile is filled into the pressure vessel, the fan power is turned on and the fan is started to fully mix the mixed gas containing perfluoroisobutyronitrile.

[0015] As a preferred solution of the method for measuring the dew point temperature of a mixed gas containing perfluoroisobutyronitrile, wherein:

[0016] The initial condition pressure-temperature ratio is expressed as:

[0017] P 0 / T 0 =A

[0018] Among them, P 0 Indicates the initial pressure value, T 0 represents the initial temperature value, and A represents the pressure-temperature ratio of the initial conditions.

[0019] As a preferred solution of the method for measuring the dew point temperature of a mixed gas containing perfluoroisobutyronitrile, wherein:

[0020] The obtaining of the real-time pressure-temperature ratio comprises:

[0021] Adjust the temperature of the temperature control box to slowly reduce the temperature of the perfluoroisobutyronitrile mixed gas in the pressure vessel, and record the pressure and temperature values ​​in the pressure vessel in real time to obtain the real-time pressure-temperature ratio, which is expressed as:

[0022] P x / T x =B x

[0023] Among them, P x Indicates the pressure value in the pressure vessel, T x Indicates the temperature value inside the pressure vessel, B x Indicates the real-time pressure-temperature ratio.

[0024] As a preferred solution of the method for measuring the dew point temperature of a mixed gas containing perfluoroisobutyronitrile, wherein:

[0025] The step of continuously lowering the temperature until the real-time pressure-temperature ratio is less than the initial pressure-temperature ratio to obtain the dew point temperature comprises:

[0026] When B x When it is less than A, record T x is the dew point temperature.

[0027] In a second aspect, an embodiment of the present invention provides a dew point temperature measurement system for a perfluoroisobutyronitrile mixed gas, comprising:

[0028] Pressure vessel, air pressure sensor, temperature sensor, fan and temperature control box;

[0029] The pressure vessel is arranged inside the temperature control box and is used to contain the mixed gas containing perfluoroisobutyronitrile;

[0030] The air pressure sensor is installed on the top of the pressure vessel and is used to measure the pressure of the perfluoroisobutyronitrile mixed gas in the pressure vessel;

[0031] The temperature sensor is installed inside the pressure vessel and is used to measure the temperature inside the pressure vessel;

[0032] The fan is arranged inside the pressure vessel and is used to fully mix the mixed gas containing perfluoroisobutyronitrile;

[0033] The temperature control box is used to control the temperature in the pressure container.

[0034] As a preferred solution of the dew point temperature measurement system containing perfluoroisobutyronitrile mixed gas, wherein:

[0035] It also includes a data acquisition, comparison and analysis device, which is connected to the air pressure sensor and the temperature sensor to receive the pressure signal and the temperature signal, and compare and analyze the pressure signal and the temperature signal;

[0036] Also included is a fan power supply, which is connected to the fan and is used to provide power to the fan;

[0037] Also included is an electrical interface, the electrical interface extends to the outside of the temperature control box, and the electrical interface is used to introduce power into the pressure vessel;

[0038] It also includes an exhaust device, which is arranged on the pressure vessel and connected to the pressure gas cylinder outside the temperature control box through an air pipe, and is used to extract the mixed gas containing perfluoroisobutyronitrile in the pressure vessel;

[0039] The invention also comprises an air charging device, which is arranged on the pressure vessel and connected to a vacuum pump outside the temperature control box through an air pipe, and is used for charging a mixed gas containing perfluoroisobutyronitrile into the pressure vessel.

[0040] As a preferred solution of the dew point temperature measurement system containing perfluoroisobutyronitrile mixed gas, wherein:

[0041] It also includes a data acquisition / mode conversion module, which is used to receive initial signals from the air pressure sensor and the temperature sensor and convert them into digital signals.

[0042] In a third aspect, an embodiment of the present invention provides a computing device, including:

[0043] Memory and processor;

[0044] The memory is used to store computer executable instructions, and the processor is used to execute the computer executable instructions. When the one or more programs are executed by the one or more processors, the one or more processors implement the dew point temperature measurement method of the mixed gas containing perfluoroisobutyronitrile as described in any embodiment of the present invention.

[0045] In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the method for measuring the dew point temperature of a mixed gas containing perfluoroisobutyronitrile.

[0046] Beneficial effects of the present invention: The dew point temperature measurement system containing a mixed gas of perfluoroisobutyronitrile of the present invention is convenient for accurately controlling the temperature in the pressure vessel by arranging the pressure vessel inside the temperature control box, simulating the temperature change under actual operating conditions, and arranging an air pressure sensor and a temperature sensor on the pressure vessel, so that the system can accurately control the temperature and pressure conditions inside the pressure vessel. The fan arranged inside the pressure vessel promotes the full mixing of the mixed gas containing perfluoroisobutyronitrile, ensuring the uniformity of the gas composition during the measurement process, thereby improving the accuracy and reliability of the measurement result. The system integrates multiple components such as the pressure vessel, the air pressure sensor, the temperature sensor and the fan to form a complete dew point temperature measurement platform, which is not only simple but also convenient to operate. The experimental process is simplified, and the experimental efficiency and measurement accuracy are improved; further, the LabVIEW program receives the digital signal processed by the data acquisition / mode conversion module, and stores and analyzes the digital signal, thereby realizing automatic data processing; the dew point temperature measurement method of the perfluoroisobutyronitrile mixed gas of the present invention can measure the dew point temperature of the perfluoroisobutyronitrile mixed gas without using a gas chromatograph, thereby simplifying the measurement process, reducing the cost and the difficulty of operation, and at the same time, by gradually reducing the temperature of the perfluoroisobutyronitrile mixed gas in the pressure vessel, the change process of the dew point pressure of the perfluoroisobutyronitrile mixed gas power equipment during the process of the operating temperature dropping is simulated, which is helpful to predict and evaluate the performance in practical applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0048] Figure 1 It is an overall flow chart of the dew point temperature measurement method of the mixed gas containing perfluoroisobutyronitrile according to the present invention;

[0049] Figure 2 It is a schematic diagram of the dew point temperature measurement system of the mixed gas containing perfluoroisobutyronitrile according to the present invention. DETAILED DESCRIPTION

[0050] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0051] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0052] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0053] Example 1

[0054] Reference Figure 1-Figure 2 , which is the first embodiment of the present invention, provides a method for measuring the dew point temperature of a mixed gas containing perfluoroisobutyronitrile, comprising:

[0055] S1: evacuate the pressure vessel 200, and fill the pressure vessel 200 with a test ratio of a mixed gas containing perfluoroisobutyronitrile through a gas charging device;

[0056] S2: measuring the initial pressure value and the initial temperature value in the pressure vessel 200 by the air pressure sensor 300 and the temperature sensor 400 to obtain the initial condition pressure-temperature ratio;

[0057] S3: adjusting the temperature of the temperature control box 100 to obtain a real-time pressure-temperature ratio;

[0058] S4: Continue to lower the temperature until the real-time pressure-temperature ratio is less than the initial pressure-temperature ratio, and obtain the dew point temperature.

[0059] In the embodiment of the present application, the mixed gas containing perfluoroisobutyronitrile in the test ratio filled in the above step S1 includes:

[0060] After the perfluoroisobutyronitrile mixed gas in the test proportion is charged into the pressure vessel, the fan power is turned on, and the fan 500 is started to fully mix the perfluoroisobutyronitrile mixed gas.

[0061] In the embodiment of the present application, the initial condition pressure-temperature ratio in the above step S2 is expressed as:

[0062] P 0 / T 0 =A

[0063] Among them, P 0 Indicates the initial pressure value, T 0 represents the initial temperature value, and A represents the pressure-temperature ratio of the initial conditions.

[0064] In the embodiment of the present application, obtaining the real-time pressure-temperature ratio in the above step S3 includes:

[0065] The temperature of the temperature control box 100 is adjusted to slowly reduce the temperature of the mixed gas containing perfluoroisobutyronitrile in the pressure vessel 200, and the pressure value and temperature value in the pressure vessel 200 are recorded in real time to obtain a real-time pressure-temperature ratio, which is expressed as:

[0066] P x / T x =B x

[0067] Among them, P x represents the pressure value in the pressure vessel 200, T x represents the temperature value in the pressure vessel 200, B x Indicates the real-time pressure-temperature ratio.

[0068] In the embodiment of the present application, the temperature is continuously lowered in the above step S4 until the real-time pressure-temperature ratio is less than the initial condition pressure-temperature ratio, and the dew point temperature is obtained, including:

[0069] When B x When it is less than A, record T x is the dew point temperature.

[0070] It should be noted that based on the principle of liquid-gas equilibrium, before the mixed gas containing perfluoroisobutyronitrile reaches the dew point temperature, the ratio of its pressure to temperature P / T relative to the ratio of the initial state of the mixed gas containing perfluoroisobutyronitrile P 0 / T 0 is the value A, that is, before the gas condenses, the number of gas phase molecules remains unchanged; when the gas condenses, the number of gas phase molecules decreases, so the ratio of pressure and temperature P / T is relative to the initial value P 0 / T 0 Based on this principle, the present invention proposes a method of filling a pressure vessel of a certain volume with a mixed gas containing perfluoroisobutyronitrile, measuring the ratio of the gas pressure and temperature in the pressure vessel, and gradually reducing the gas temperature in the pressure vessel to measure the dew point temperature.

[0071] The above is a schematic scheme of the method for measuring the dew point temperature of a mixed gas containing perfluoroisobutyronitrile in this embodiment. It should be noted that the technical scheme of the dew point temperature measurement system containing a mixed gas containing perfluoroisobutyronitrile and the technical scheme of the method for measuring the dew point temperature of a mixed gas containing perfluoroisobutyronitrile are of the same concept, and the details of the technical scheme of the dew point temperature measurement system containing a mixed gas containing perfluoroisobutyronitrile in this embodiment that are not described in detail can all be referred to the description of the technical scheme of the method for measuring the dew point temperature of a mixed gas containing perfluoroisobutyronitrile.

[0072] The dew point temperature measurement system of the perfluoroisobutyronitrile mixed gas in this embodiment includes:

[0073] A pressure container 200, an air pressure sensor 300, a temperature sensor 400, a fan 500 and a temperature control box 100;

[0074] In the embodiment of the present application, the pressure vessel 200 is disposed inside the temperature control box 100 and is used to contain the mixed gas containing perfluoroisobutyronitrile;

[0075] In another possible implementation, a gas composition analyzer may be installed in the pressure vessel 200 to monitor the composition changes of the mixed gas containing perfluoroisobutyronitrile in real time to ensure the impact of gas purity and concentration on the measurement results.

[0076] In another possible implementation, a multi-channel sampling device may be introduced to measure different gases simultaneously to improve the data comparison and reliability of the experiment.

[0077] In the embodiment of the present application, the dew point temperature measurement system containing the perfluoroisobutyronitrile mixed gas further includes:

[0078] The air pressure sensor 300 is installed on the top of the pressure vessel 200 and is used to measure the pressure of the mixed gas containing perfluoroisobutyronitrile in the pressure vessel 200;

[0079] The temperature sensor 400 is installed inside the pressure vessel 200 and is used to measure the temperature inside the pressure vessel 200;

[0080] The fan 500 is disposed inside the pressure vessel 200 to fully mix the mixed gas containing perfluoroisobutyronitrile;

[0081] The temperature control box 100 is used to control the temperature inside the pressure container 200 .

[0082] In another possible implementation, a humidity sensor may be added to the temperature control box 100 to monitor the air humidity in real time to provide more accurate dew point temperature measurement.

[0083] A humidifier or dehumidifier is also installed in the temperature control box to adjust the gas humidity and ensure the measurement accuracy under specific experimental conditions.

[0084] In the embodiment of the present application, the dew point temperature measurement system containing the perfluoroisobutyronitrile mixed gas further includes:

[0085] The data acquisition, comparison and analysis device is connected to the air pressure sensor 300 and the temperature sensor 400, and is used to receive the pressure signal and the temperature signal, and compare and analyze the pressure signal and the temperature signal;

[0086] A fan power supply, the fan power supply is connected to the fan 500 and is used to provide power to the fan 500;

[0087] An electrical interface, which extends to the outside of the temperature control box 100 and is used to introduce a power source into the pressure vessel 200;

[0088] A gas extraction device, which is disposed on the pressure vessel 200 and connected to the pressure gas cylinder outside the temperature control box 100 through a gas pipe, and is used to extract the mixed gas containing perfluoroisobutyronitrile in the pressure vessel 200;

[0089] The gas filling device is arranged on the pressure vessel 200 and is connected to the vacuum pump outside the temperature control box 100 through an air pipe, and is used for filling the pressure vessel 200 with a mixed gas containing perfluoroisobutyronitrile.

[0090] The data acquisition / mode conversion module is used to receive the initial signals of the air pressure sensor 300 and the temperature sensor 400 and convert them into digital signals.

[0091] In an embodiment of the present application, the data acquisition / mode conversion module converts the initial signals of the pressure sensor and the temperature sensor into digital signals that can be processed by the LabVIEW program; the LabVIEW program is used to receive the digital signals processed by the data acquisition / mode conversion module, and store and analyze the digital signals.

[0092] In another possible implementation, a cloud-based real-time monitoring platform may be added to upload the data from the data acquisition / pattern conversion module to the cloud, and big data analysis technology may be used to achieve remote monitoring and analysis of the data.

[0093] In another possible implementation, a machine learning algorithm may be used to analyze historical measurement data, automatically adjust measurement and control parameters according to different conditions, and optimize system performance.

[0094] This embodiment also provides a computing device, which is applicable to the dew point temperature measurement method of a mixed gas containing perfluoroisobutyronitrile, and includes:

[0095] Memory and processor; the memory is used to store computer executable instructions, and the processor is used to execute computer executable instructions to implement the dew point temperature measurement method of the mixed gas containing perfluoroisobutyronitrile as proposed in the above embodiment.

[0096] This embodiment further provides a storage medium on which a computer program is stored. When the program is executed by a processor, the method for measuring the dew point temperature of a mixed gas containing perfluoroisobutyronitrile as proposed in the above embodiment is implemented.

[0097] The storage medium proposed in this embodiment and the dew point temperature measurement method containing perfluoroisobutyronitrile mixed gas proposed in the above embodiment belong to the same inventive concept. The technical details not fully described in this embodiment can be referred to the above embodiment, and this embodiment has the same beneficial effects as the above embodiment.

[0098] Example 2

[0099] Reference Figure 1-Figure 2 , which is an embodiment of the present invention, provides a method for measuring the dew point temperature of a mixed gas containing perfluoroisobutyronitrile. In order to verify the beneficial effects of the present invention, a scientific demonstration is carried out through simulation experiments.

[0100] Select a thermostatic box with precise temperature control function as the temperature control box 100. The temperature adjustment range of the temperature control box 100 needs to cover the required range of dew point measurement of the mixed gas containing perfluoroisobutyronitrile. Place the temperature control box 100 in a stable working environment to ensure that there is no interference from external heat or cold sources. Select a high-strength, corrosion-resistant stainless steel pressure vessel 200, place the pressure vessel 200 inside the temperature control box 100, and ensure that it is firmly fixed to prevent movement or tilting during the experiment. Select a high-precision air pressure sensor 300 and install it on the top of the pressure vessel 200 to ensure that the gas pressure inside the pressure vessel 200 can be accurately measured. The air pressure sensor 300 is connected to the data acquisition, comparison and analysis device via a cable.

[0101] A temperature sensor 400 is installed inside the pressure vessel 200 to ensure that the temperature distribution inside the pressure vessel 200 can be fully and accurately monitored. The temperature sensor 400 is also connected to the data acquisition, comparison and analysis device via a cable. A small fan 500 is installed inside the pressure vessel 200 and powered by a fan power supply. The position of the fan 500 should ensure that the mixed gas in the container can be fully stirred to promote uniform mixing of the gas.

[0102] A device with data acquisition, comparison and analysis functions is installed, the device is connected to the air pressure sensor 300 and the temperature sensor 400, and receives and processes the pressure signal and temperature signal from the air pressure sensor 300 and the temperature sensor 400 in real time. At the same time, the device should also have the ability to communicate with the LabVIEW program so as to transmit the processed data to the LabVIEW program for further storage and analysis.

[0103] An electrical interface is provided on the outside of the temperature control box 100 for introducing power into the interior of the pressure vessel 200 to supply power to the fan 500, the air pressure sensor 300 and the temperature sensor 400; an exhaust device and an air charging device are installed on the pressure vessel 200, and are connected to an external pressure gas cylinder and a vacuum pump respectively through air pipes; the exhaust device is used to extract the mixed gas in the container after the experiment, and the air charging device is used to charge a new mixed gas containing perfluoroisobutyronitrile into the container.

[0104] Experimental procedures

[0105] System preparation: Place the pressure vessel 200 into the temperature control box 100, connect the air pressure sensor 300, temperature sensor 400, fan 500, data acquisition, comparison and analysis device and electrical interface, and ensure that all equipment is in normal working condition;

[0106] Inflation: A mixed gas containing perfluoroisobutyronitrile in a measured proportion is charged into the pressure vessel 200 using an inflating device, and the inflating valve is closed. At this time, the initial pressure value and the initial temperature value in the pressure vessel 200 are measured by the air pressure sensor 300 and the temperature sensor 400 to obtain the initial condition pressure-temperature ratio;

[0107] Temperature control: adjusting the temperature of the temperature control box 100 to slowly reduce the temperature in the pressure vessel 200;

[0108] Data collection: During the temperature drop, the pressure value and temperature value in the pressure vessel 200 are measured by the air pressure sensor 300 and the temperature sensor 400 to obtain the real-time pressure-temperature ratio;

[0109] Data analysis: The data acquisition, comparison and analysis device receives the pressure signal and temperature signal from the air pressure sensor 300 and the temperature sensor 400 in real time, performs preliminary processing, converts the processed data into digital signals through the data acquisition / mode conversion module, and transmits them to the LabVIEW program for storage and analysis, and calculates the difference between the real-time pressure-temperature ratio and the initial condition pressure-temperature ratio;

[0110] End of the experiment: When the real-time pressure-temperature ratio is less than the initial pressure-temperature ratio, record the temperature value at this time as the dew point temperature, turn off the temperature control system and all equipment power supplies, and use the exhaust device to extract the mixed gas in the container.

[0111] Through the above embodiments, the actual operation and application process of a dew point temperature measurement system containing a perfluoroisobutyronitrile mixed gas can be fully demonstrated.

[0112] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A method for measuring the dew point temperature of a mixed gas containing perfluoroisobutyronitrile, characterized in that: include: The pressure container (200) is evacuated, and a mixed gas containing perfluoroisobutyronitrile in a test proportion is charged into the pressure container (200) through a charging device; Measuring the initial pressure value and the initial temperature value in the pressure container (200) by means of a pressure sensor (300) and a temperature sensor (400) to obtain an initial condition pressure-temperature ratio; Adjusting the temperature of the temperature control box (100) to obtain a real-time pressure-temperature ratio; Continue to lower the temperature until the real-time pressure-temperature ratio is less than the initial pressure-temperature ratio to obtain the dew point temperature.

2. The method for measuring the dew point temperature of a mixed gas containing perfluoroisobutyronitrile according to claim 1, characterized in that: The perfluoroisobutyronitrile mixed gas filled into the test ratio includes: After the perfluoroisobutyronitrile mixed gas in the test proportion is charged into the pressure container, the fan power is turned on and the fan (500) is started to fully mix the perfluoroisobutyronitrile mixed gas.

3. The method for measuring the dew point temperature of a mixed gas containing perfluoroisobutyronitrile according to claim 2, characterized in that: The initial condition pressure-temperature ratio is expressed as: P0 / T0=A Wherein, P0 represents the initial pressure value, T0 represents the initial temperature value, and A represents the pressure-temperature ratio of the initial condition.

4. The method for measuring the dew point temperature of a mixed gas containing perfluoroisobutyronitrile according to claim 3, characterized in that: The obtaining of the real-time pressure-temperature ratio comprises: The temperature of the temperature control box (100) is adjusted to slowly reduce the temperature of the perfluoroisobutyronitrile mixed gas in the pressure container (200), and the pressure value and temperature value in the pressure container (200) are recorded in real time to obtain a real-time pressure-temperature ratio, which is expressed as: P x / T x =B x Among them, P x represents the pressure value in the pressure container (200), T x represents the temperature value in the pressure vessel (200), B x Indicates the real-time pressure-temperature ratio.

5. The method for measuring the dew point temperature of a mixed gas containing perfluoroisobutyronitrile according to claim 4, characterized in that: The step of continuously lowering the temperature until the real-time pressure-temperature ratio is less than the initial pressure-temperature ratio to obtain the dew point temperature comprises: When B x When it is less than A, record T x is the dew point temperature.

6. A system using the method for measuring the dew point temperature of a mixed gas containing perfluoroisobutyronitrile as claimed in any one of claims 1 to 5, characterized in that: include: A pressure container (200), an air pressure sensor (300), a temperature sensor (400), a fan (500) and a temperature control box (100); The pressure container (200) is arranged inside the temperature control box (100) and is used to contain a mixed gas containing perfluoroisobutyronitrile; The air pressure sensor (300) is installed on the top of the pressure container (200) and is used to measure the pressure of the perfluoroisobutyronitrile mixed gas in the pressure container (200); The temperature sensor (400) is installed inside the pressure container (200) and is used to measure the temperature inside the pressure container (200); The fan (500) is arranged inside the pressure container (200) and is used to fully mix the mixed gas containing perfluoroisobutyronitrile; The temperature control box (100) is used to control the temperature inside the pressure container (200).

7. The dew point temperature measurement system containing perfluoroisobutyronitrile mixed gas according to claim 6, characterized in that: It also includes a data acquisition, comparison and analysis device, which is connected to the air pressure sensor (300) and the temperature sensor (400) and is used to receive the pressure signal and the temperature signal, and compare and analyze the pressure signal and the temperature signal; Also included is a fan power supply, which is connected to the fan (500) and is used to provide power to the fan (500); It also includes an electrical interface, which extends to the outside of the temperature control box (100) and is used to introduce a power source into the interior of the pressure container (200); It also includes an exhaust device, which is arranged on the pressure container (200) and connected to a pressure gas cylinder outside the temperature control box (100) through an air pipe, and is used to extract the mixed gas containing perfluoroisobutyronitrile in the pressure container (200); The invention also comprises a gas charging device, which is arranged on the pressure container (200) and connected to a vacuum pump outside the temperature control box (100) through a gas pipe, and is used for charging a mixed gas containing perfluoroisobutyronitrile into the pressure container (200).

8. The dew point temperature measurement system containing perfluoroisobutyronitrile mixed gas according to claim 7, characterized in that: It also includes a data acquisition / mode conversion module, which is used to receive initial signals from the air pressure sensor (300) and the temperature sensor (400) and convert them into digital signals.

9. A computing device comprising: Memory and processor; The memory is used to store computer executable instructions, and the processor is used to execute the computer executable instructions. When the computer executable instructions are executed by the processor, the steps of the method for measuring the dew point temperature of a mixed gas containing perfluoroisobutyronitrile as claimed in any one of claims 1 to 5 are implemented.

10. A computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, implement the steps of the method for measuring the dew point temperature of a mixed gas containing perfluoroisobutyronitrile according to any one of claims 1 to 5.

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