Thermal-gas separation type low adsorption C4F7N mixed gas portable detection method and device

Abstract

This invention relates to the field of gas insulation equipment testing technology, and particularly to a portable detection method and device for low-adsorption C4F7N mixed gas using a heat-gas separation method. The method includes: constructing a molecular model of the C4F7N mixed gas and its decomposition products, as well as a surface model of candidate flow path materials; performing interaction calculations and analyses on the molecular and surface models to obtain adsorption behavior parameters of gas molecules on different candidate material surfaces; classifying the candidate materials based on their compatibility according to the adsorption behavior parameters, identifying weakly adsorbing materials as the main detection flow path materials and strongly adsorbing materials as bypass purification materials; optimizing the detection flow path for low adsorption based on the material classification results; spatially isolating the main detection flow path from the heat source, and directionally dissipating the heat generated by the heat source through an independent heat dissipation channel. This invention solves the problems of response lag and reading distortion caused by gas adsorption in traditional equipment, significantly improving the detection response speed and accuracy.

Description

Technical Field

[0001] This invention relates to the field of gas insulation equipment testing technology, and in particular to a portable testing method and device for heat-gas separation type low-adsorption C4F7N mixed gas. Background Technology

[0002] Perfluoroisobutyronitrile (C4F7N), a novel environmentally friendly insulating gas with low global warming potential, is considered one of the ideal media to replace sulfur hexafluoride (SF6) due to its good insulation properties. In practical power equipment applications, C4F7N is usually mixed with buffer gases such as CO2, O2, and N2, and its insulation performance is highly dependent on the precise ratio of C4F7N. However, during equipment operation, C4F7N is prone to decomposition under conditions of electric arc, partial discharge, or overheating, producing byproducts such as hydrogen fluoride and fluorocarbons. These byproducts not only affect the gas insulation performance but may also corrode the metal components of the equipment, threatening the safe and stable operation of the power installation. This places higher demands on the temperature control, flow path material selection, and purification capabilities of C4F7N mixed gas detection devices.

[0003] Currently, most common C4F7N mixed gas detection devices adopt an integrated portable housing structure. While convenient for field use, the limited heat dissipation within the housing leads to heat accumulation during instrument operation, causing localized temperature rises. This, in turn, affects the stability of the temperature control unit and may induce thermal decomposition or secondary changes in the sample gas within the flow path. Furthermore, existing flow path material selection focuses primarily on pressure resistance, corrosion resistance, and ease of processing, lacking quantitative research on the adsorption behavior of C4F7N and its typical decomposition products. Because the C4F7N molecule contains a polar cyano group, different metals, polymers, inert coatings, and porous materials exhibit significant differences in their adsorption capacity for C4F7N and its decomposition products. Simply relying on empirical material selection is insufficient to simultaneously meet the requirements of low adsorption detection and decomposition product purification. Existing studies have shown that the interaction strength between CO, CF4, and C3F6 in the decomposition products of C4F7N and the surfaces of metals such as copper and aluminum is not consistent, indicating that the traditional list of corrosion-resistant materials alone is insufficient to meet the design requirements of the detection flow path. At the same time, MOFs and their composite adsorbents have strong adsorption capacity and are more suitable as purification, purging, or exhaust gas treatment units, rather than as the inner wall material of the main detection flow path, otherwise it will seriously affect the independence and reliability of the detection data.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the general background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] This invention provides a portable detection method and device for low-adsorption C4F7N mixed gas using a heat-gas separation method, thereby effectively solving the problems in the background art.

[0006] To achieve the above objectives, the technical solution adopted by this invention is: a portable detection method for low-adsorption C4F7N mixed gas using a heat-gas separation method, comprising the following steps: Molecular models of C4F7N mixed gas and its decomposition products, as well as surface models of candidate flow path materials, were constructed. Interaction calculations and analyses were performed on the molecular model and the surface model to obtain adsorption behavior parameters of gas molecules on different candidate material surfaces; Based on the adsorption behavior parameters, the candidate materials are classified for compatibility, and the weakly adsorbed materials are identified as the main detection flow path materials, while the strongly adsorbed materials are identified as the bypass purification materials. The detection flow path was optimized for low adsorption based on the material classification results. The main detection flow path is spatially isolated from the heat source, and the heat generated by the heat source is directionally discharged through an independent heat dissipation channel.

[0007] Furthermore, the decomposition products include at least one of HF, C2F6, C3F8, CO, and CF4; The candidate flow path materials include metallic materials, inert coating materials, fluoropolymer materials, and porous adsorbent materials.

[0008] Furthermore, the interaction calculation analysis includes: using first-principles calculation methods and introducing van der Waals interaction corrections for metallic materials, and using amorphous unit cell modeling methods for polymer materials.

[0009] Furthermore, the adsorption behavior parameters include one or more of the following: adsorption energy, surface residence time, number of contact atoms, radial distribution function peak value, diffusion coefficient, and average distance from the molecular centroid to the surface; The compatibility classification is based on factors including adsorption energy, whether bonding or breaking occurs, and whether orbital hybridization exists. The strong adsorption material includes at least one of molecular sieves, MOFs and porous nanofiber composite adsorption materials, and is arranged in the bypass cleaning flow path or the exhaust gas purification flow path.

[0010] Furthermore, the low-adsorption optimization design includes shortening the length of the main detection channel, setting a smooth transition bend, reducing blind cavities, reducing the inner wall roughness to Ra no greater than 0.4µm, and setting one or more of an inert liner or inert coating on the inner wall.

[0011] Furthermore, the spatial isolation of the main detection flow path from the heat source is achieved by installing the calibrator in a tilted and suspended manner inside the portable case, thereby forming an independent heat dissipation airflow channel between the side wall of the calibrator and the inner wall of the case.

[0012] Furthermore, it also includes: Clean gas is blown into the flow path during the detection gap to purge and replace the residual C4F7N gas in the flow path.

[0013] The present invention also includes a portable detection device for a heat-gas separation type low-adsorption C4F7N mixed gas, using the method described above, wherein the device comprises: Portable case with cushioning components; The calibrator is installed in the box in an inclined suspension manner through a telescopic pivot and hinge hole. An independent heat dissipation air duct is formed between the side wall of the calibrator and the inner wall of the box. Ventilation openings are provided at corresponding positions in the box. A gas flow path module is arranged on a mounting plate. The inner wall material of the gas flow path module is determined by the material classification results. The inner wall roughness Ra is not greater than 0.4µm, and the sealing element is made of perfluoroether rubber. The temperature control unit, including a temperature sensing element and a temperature control cover, is used to precisely control the temperature of the gas flowing through the flow path; The cleaning device, including an exhaust pump and clean gas piping, is used to purge residual gas in the flow path during the detection interval.

[0014] Furthermore, the buffer components include a crossbeam, buffer springs, and rubber undersupport pads, distributed at the bottom and front face of the housing.

[0015] Furthermore, the tilt angle of the calibrator is 15° to 30°.

[0016] Furthermore, the temperature control unit stably controls the gas temperature at 25±1℃; The mounting plate has a hollow structure in the gas flow path module installation area, which, together with the temperature control cover, forms a localized precise temperature control zone.

[0017] The present invention also includes a computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements the method as described above.

[0018] The present invention also includes a storage medium having a computer program stored thereon, which, when executed by a processor, implements the method as described above.

[0019] The beneficial effects of this invention are as follows: In the design of the flow path material for C4F7N mixed gas detection, the interaction between C4F7N and its decomposition products on different material surfaces is calculated, thereby selecting low-adsorption materials and avoiding the blindness of traditional empirical material selection. Simultaneously, combined with precise flow path temperature control, the adsorption and reaction of C4F7N in the flow path are significantly suppressed, greatly improving the detection response speed and accuracy. By separating the calibrator from the portable housing using an inclined suspension structure, the heat generated during instrument operation is directly exhausted to the outside of the housing through an independent air duct, achieving spatial isolation and directional heat dissipation between the gas flow path and the heat source. This fundamentally avoids the risk of C4F7N gas thermal decomposition due to instrument temperature rise, ensuring the accuracy and stability of detection data. The use of high-gloss inert materials to manufacture the gas flow path, combined with precise flow path temperature control, effectively suppresses the adsorption and reaction of C4F7N gas in the flow path, solving problems such as response lag and reading distortion caused by gas adsorption in traditional equipment, and significantly improving the detection response speed and accuracy. Meanwhile, by setting up a bypass purification module, MOFs or their composite adsorption materials can be used in the exhaust gas treatment or purging purification process, which not only gives full play to the purification advantages of high adsorption materials, but also avoids interference with the main detection results. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a flowchart of the method in Embodiment 1 of the present invention; Figure 2 This is a flowchart of the method in Embodiment 2 of the present invention; Figure 3 This is a schematic diagram of the optimized model of Al2O3 and Al materials, and C4F7N in Embodiment 2 of the present invention. Figure 4 This is a schematic diagram showing the interaction results between the C4F7N mixed gas and the material in Embodiment 2 of the present invention; Figure 5 This is a schematic diagram of the portable detection device for C4F7N mixed gas in Embodiment 3 of the present invention; Figure 6 This is a schematic diagram of the C4F7N mixed gas calibrator in Embodiment 3 of the present invention; Figure 7 This is a schematic diagram of the computer device in Embodiment 4 of the present invention. Detailed Implementation

[0022] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0023] Example 1: like Figure 1 As shown: A portable detection method for low-adsorption C4F7N mixed gas using a heat-gas separation method includes the following steps: Molecular models of C4F7N mixed gas and its decomposition products, as well as surface models of candidate flow path materials, were constructed. Interaction calculations and analyses were performed on molecular and surface models to obtain parameters of gas molecule adsorption behavior on the surfaces of different candidate materials. Candidate materials are classified for compatibility based on adsorption behavior parameters. Weakly adsorbing materials are identified as the main detection flow path materials, and strongly adsorbing materials are identified as bypass purification materials. The detection flow path was optimized for low adsorption based on the material classification results. The main detection flow path is spatially isolated from the heat source, and the heat generated by the heat source is directionally discharged through an independent heat dissipation channel.

[0024] In the design of the flow path material for C4F7N mixed gas detection, the interaction between C4F7N and its decomposition products on different material surfaces was calculated, and low-adsorption materials were selected accordingly, avoiding the blind selection based on traditional experience. Simultaneously, combined with precise flow path temperature control, the adsorption and reaction of C4F7N in the flow path were significantly suppressed, greatly improving the detection response speed and accuracy. By separating the calibrator from the portable housing using an inclined suspension structure, the heat generated during instrument operation is directly exhausted to the outside of the housing through an independent air duct, achieving spatial isolation and directional heat dissipation between the gas flow path and the heat source. This fundamentally avoids the risk of C4F7N gas thermal decomposition due to instrument temperature rise, ensuring the accuracy and stability of detection data. The gas flow path is manufactured using a high-gloss inert material, and combined with precise flow path temperature control, the adsorption and reaction of C4F7N gas in the flow path are effectively suppressed, solving problems such as response lag and reading distortion caused by gas adsorption in traditional equipment, significantly improving the detection response speed and accuracy. Meanwhile, by setting up a bypass purification module, MOFs or their composite adsorption materials can be used in the exhaust gas treatment or purging purification process, which not only gives full play to the purification advantages of high adsorption materials, but also avoids interference with the main detection results.

[0025] The decomposition products include at least one of HF, C2F6, C3F8, CO, and CF4. Candidate flow path materials include metallic materials, inert coating materials, fluoropolymer materials, and porous adsorbent materials.

[0026] Interaction calculation analysis includes: first-principles calculations with van der Waals interaction corrections for metallic materials, and amorphous cell modeling for polymer materials.

[0027] In this embodiment, the adsorption behavior parameters include one or more of the following: adsorption energy, surface residence time, number of contact atoms, radial distribution function peak value, diffusion coefficient, and average distance from the molecular centroid to the surface. Compatibility classification is based on factors including adsorption energy, whether bonding or breaking occurs, and whether orbital hybridization exists. Strong adsorption materials include at least one of molecular sieves, MOFs and porous nanofiber composite adsorption materials, which are arranged in the bypass cleaning flow path or the exhaust gas purification flow path.

[0028] The low-adsorption optimization design includes shortening the length of the main detection channel, setting a smooth transition bend, reducing blind cavities, reducing the inner wall roughness to Ra no greater than 0.4µm, and setting one or more of the following on the inner wall: an inert liner or an inert coating.

[0029] As a preferred embodiment of the above, spatial isolation between the main detection flow path and the heat source is achieved by installing the calibrator in a tilted and suspended manner inside the portable case, so that an independent heat dissipation air duct is formed between the side wall of the calibrator and the inner wall of the case.

[0030] This also includes: Clean gas is blown into the flow path during the detection gap to purge and replace the residual C4F7N gas in the flow path.

[0031] Example 2: like Figure 2 As shown, this embodiment includes a flow path design method for detecting C4F7N insulating gas and its decomposition products, comprising the following steps: S1: A C4F7N mixed gas model was established and its geometry optimized to obtain a stable configuration. 316L stainless steel, alumina, and aluminum were selected as candidate metal materials; diamond-like carbon (DLC), amorphous carbon (aC), and oxide inert coatings were selected as candidate inert coating materials; PTFE, FEP, and PFA were selected as candidate fluoropolymer materials; and molecular sieves, MOFs, and porous nanofiber composite adsorbent materials were selected as candidate porous adsorbent materials.

[0032] S2: Computational analysis is performed on gas molecule models and candidate material models. For metallic materials, first-principles calculations are used for structural optimization, with van der Waals interaction corrections introduced. The DSPP method is used for atomic nuclei and inner-shell electrons, and an appropriate k-point mesh is selected to ensure computational accuracy. For polymer materials, amorphous unit cells are constructed for modeling and structural analysis.

[0033] S3: For metallic materials, such as Figure 3 As shown, Al2O3(001) and Al(111) crystal plane models are preferably constructed, and C4F7N is optimized onto them using model D. Based on existing research, the metal surface model can employ a 3×3×4 supercell containing 4 layers and a total of 36 metal atoms, with the periodic system vacuum layer set to 20 Å. By changing the initial orientation and position of the molecules, the most stable interaction structure is obtained.

[0034] S4: Extract the interaction energy E of C4F7N and its decomposition products on different material surfaces of the optimized interface system. ads Parameters such as charge transfer, differential charge density, density of states, and changes in the distance between molecules and the surface are used as criteria for evaluating material compatibility. The interaction energy is calculated according to the following formula: (1) Among them, E total E represents the total energy of the system after adsorption equilibrium. surface For the energy of a single surface model, E gas This refers to the energy of a single gas molecule. When the absolute value of the interaction energy is small, no obvious electron enrichment bridging appears in the differential charge density distribution, no obvious orbital hybridization appears in the density of states, and no obvious bonding or breaking occurs, it is determined that the material interacts mainly with gas molecules through weak physical interactions, making it suitable as a candidate material for the main detection flow path; conversely, it is suitable as a candidate material for the bypass purification or exhaust gas treatment area. Taking C4F7N on the Al2O3(001) surface as an example, the calculated interaction energy is -1.04 eV, C4F7N loses 0.356 e electrons, and after adsorption, the nitrogen atom of C4F7N is approximately 2.01 Å away from the surface; Figure 4 As shown, DOS analysis reveals significant orbital hybridization between the 2p orbitals of N atoms and the 3s and 3p orbitals of Al atoms. These characteristics indicate a strong chemical interaction between C4F7N and the Al2O3 surface, making Al2O3 a suitable candidate material for bypass purification or exhaust gas treatment. For other materials combined with decomposition products, the same calculation process was used: those with weak interactions, no bonding, and no hybridization were assigned to the main detection path; those with strong interactions, close proximity, and orbital hybridization were assigned to bypass purification or exhaust gas treatment candidate materials.

[0035] S5: Based on the parameters obtained in step S4, the candidate materials are graded and evaluated. Materials with low adsorption energy for C4F7N and target decomposition products, weak interfacial interactions, and no obvious structural rearrangement are identified as main detection flow path materials; materials with high adsorption energy for typical decomposition products such as HF, CO, CF4, and C3F6, and long residence time are identified as preferred materials for bypass cleaning or exhaust gas purification.

[0036] S6: Based on the material screening results, the detection flow path is designed with low adsorption, including: shortening the length of the main detection channel; reducing sharp turns and abrupt changes in steps at the connection points; reducing the dead volume and the number of blind cavities; setting inert liner or inert coating in necessary metal transition areas; and placing high adsorption materials only in the bypass cleaning flow path or exhaust gas purification flow path, rather than directly on the inner wall of the main detection flow path.

[0037] S7: The main detection flow path and the bypass cleaning module are arranged in separate zones so that the highly adsorbent material does not directly participate in the main detection process. After the detection is completed, the residual sample gas is sent to the bypass cleaning module or the exhaust gas purification module through a switching valve or purging path to reduce device residue and harmful emissions. This achieves a synergistic design of low adsorption in the main detection flow path and high selective adsorption in the bypass or exhaust gas area.

[0038] Based on the above flow path design, the internal thermal field of the detection device is further optimized by combining the heat dissipation channel of the box, the heat insulation compartment structure and the active temperature control unit, so as to reduce the impact of thermal decomposition and temperature drift during sample gas transportation.

[0039] Example 3: This embodiment includes a portable detection device, such as... Figure 5 and Figure 6 As shown, the portable case 1 is made of high-strength engineering plastic through one-piece injection molding and has a flip-top structure. The case lid is connected to the main body of the case via a hinged sleeve. The inner surface of the case lid has a sealing groove 11 and a sealing strip 14, which can achieve good airtightness and dustproof effect when closed, preventing external dust and moisture from entering the internal precision components. Buffer components 5 are symmetrically arranged at the front and rear ends of the case. This component consists of a crossbeam 51, multiple buffer springs 52, and rubber under-support pads 53, distributed at the bottom and front face of the case. During transport or on-site placement, the buffer springs can elastically absorb vibration energy, while the rubber under-support pads increase the friction with the contact surface and buffer impact. This dual-protection structure can effectively attenuate the impact of external vibration and impact on internal precision components such as calibrators and gas flow path modules, ensuring the structural stability of the equipment in complex on-site environments. A positioning lock 13 is also provided on the side of the case to lock the flip-top in the open position and prevent accidental opening during transport.

[0040] The calibrator 2 is hinged to the telescopic rotating shaft and bracket 12 inside the housing via hinge holes 27 on both sides. It can be adjusted to tilt forward (preferably 15°-30°) and suspended and fixed according to usage requirements. This tilting structure creates an independent heat dissipation air duct between the side wall of the calibrator and the inner wall of the housing. The housing is equipped with vents 7 at the corresponding positions of the air duct. The heat generated by the instrument during operation can be directly discharged to the outside of the housing through the air duct and vents, thus preventing heat accumulation inside the housing from the source.

[0041] The calibrator 2 integrates a control display screen 21 and operation buttons 22 on its surface, making it convenient for users to view test data and set parameters in real time. The side is equipped with a sound tube 26, a corrosion-resistant gas interface 24, a power meter 25, and a power interface 23. The sound tube can issue an alarm when the test data is abnormal. The power meter displays the remaining power of the equipment in real time, making it convenient to monitor the battery status during on-site operations. The corrosion-resistant gas interface ensures a sealed connection with the gas flow path and corrosion resistance.

[0042] The gas flow path module 3 is arranged on the mounting plate 4 and mainly includes a conduit 31, a flow control cylinder 32, an inlet pipe 33, an outlet pipe 34, a connecting pipe 35, and an analysis and calibration box 41. Each component is fixed by a pipe rack 64 to ensure stable connection. The inner wall material of all flow path components is determined by the result of step S4, and the inner wall roughness Ra is no greater than 0.4µm. The seals are made of perfluoroether rubber. For material areas that are determined to be controllable, an active adsorption control structure is provided. This design greatly reduces the adsorption activity and reaction probability of C4F7N molecules on the flow path surface, effectively suppresses gas residue and component changes, and ensures the authenticity and response speed of the test sample.

[0043] The mounting plate 4 features a hollow structure in the installation areas of the conduit 31, flow control cylinder 32, and temperature control section, forming a localized, precise temperature control zone in conjunction with the temperature control cover 43 and the temperature sensing element 42. The temperature sensing element 42 monitors the temperature within the temperature control zone in real time and feeds the signal back to the temperature control device. The temperature control device adjusts the heating or cooling power of the temperature control cover 43 to stably control the temperature of the gas flowing through the conduit within a preset range (preferably 25±1℃), effectively eliminating the impact of temperature fluctuations on the adsorption balance of C4F7N gas and improving the stability and data repeatability of the detection process.

[0044] The internal enclosure integrates a cleaning device 6, which includes an outer protective box 65, an exhaust pump 62, an air outlet 63, a pipe rack 64, and a switch button 61. The exhaust pump is connected to the gas flow path through the air outlet 63. After each testing task is completed, the user can manually start the cleaning function by operating the switch button 61, or activate the automatic cleaning mode in the device settings, which will automatically start the device during testing intervals. During cleaning, the exhaust pump blows a preset clean gas (such as high-purity nitrogen or dry air) into the gas path device through the air outlet 63. The clean gas flows at high speed along the entire flow path, including the duct 31, the flow control cylinder 32, and the connecting pipe 35, achieving thorough purging and replacement of residual C4F7N gas inside the flow path. This cleaning function, in conjunction with the low-adsorption flow path design, effectively avoids cross-contamination between different samples during continuous testing, ensuring the independence and accuracy of batch testing data.

[0045] Example 4: Please see Figure 7The diagram shows a structural schematic of a computer device provided in an embodiment of this application. An embodiment of this application provides a computer device 400, including a processor 410 and a memory 420. The memory 420 stores a computer program executable by the processor 410. When the computer program is executed by the processor 410, it performs the method described above.

[0046] This application embodiment also provides a storage medium 430, on which a computer program is stored, and the computer program is executed by a processor 410 to perform the above method.

[0047] The storage medium 430 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read Only Memory (EPROM), Programmable Red-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0048] In the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. "A plurality of" means two or more, unless otherwise explicitly specified.

[0049] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0050] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0051] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of the invention includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as will be understood by those skilled in the art to which embodiments of the invention pertain.

[0052] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution means, apparatus, or device (such as a computer-based device, a processor-included device, or other means that can fetch and execute instructions from, or in conjunction with, an instruction execution means, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit a program for use by, or in conjunction with, an instruction execution means, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0053] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution device. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0054] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0055] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. A portable detection method of low-adsorption C4F7N mixed gas by thermal-gas separation, characterized in that, Includes the following steps: Molecular models of C4F7N mixed gas and its decomposition products, as well as surface models of candidate flow path materials, were constructed. Interaction calculations and analyses were performed on the molecular model and the surface model to obtain adsorption behavior parameters of gas molecules on different candidate material surfaces; Based on the adsorption behavior parameters, the candidate materials are classified for compatibility, and the weakly adsorbed materials are identified as the main detection flow path materials, while the strongly adsorbed materials are identified as the bypass purification materials. The detection flow path was optimized for low adsorption based on the material classification results. The main detection flow path is spatially isolated from the heat source, and the heat generated by the heat source is directionally discharged through an independent heat dissipation channel.

2. The portable detection method for low-adsorption C4F7N mixed gas by heat-gas separation according to claim 1, characterized in that, The decomposition products include at least one of HF, C2F6, C3F8, CO, and CF4; The candidate flow path materials include metallic materials, inert coating materials, fluoropolymer materials, and porous adsorbent materials.

3. The portable detection method for low-adsorption C4F7N mixed gas by heat-gas separation according to claim 1, characterized in that, The interaction calculation analysis includes: using first-principles calculation methods and introducing van der Waals interaction corrections for metallic materials, and using amorphous unit cell modeling methods for polymer materials.

4. The portable detection method for low-adsorption C4F7N mixed gas by heat-gas separation according to claim 1, characterized in that, The adsorption behavior parameters include one or more of the following: adsorption energy, surface residence time, number of contact atoms, radial distribution function peak, diffusion coefficient, and average distance from the molecular centroid to the surface. The compatibility classification is based on factors including adsorption energy, whether bonding or breaking occurs, and whether orbital hybridization exists. The strong adsorption material includes at least one of molecular sieves, MOFs and porous nanofiber composite adsorption materials, and is arranged in the bypass cleaning flow path or the exhaust gas purification flow path.

5. The portable detection method for low-adsorption C4F7N mixed gas by heat-gas separation according to claim 1, characterized in that, The low-adsorption optimization design includes shortening the length of the main detection channel, setting a smooth transition bend, reducing blind cavities, reducing the inner wall roughness to Ra no greater than 0.4µm, and setting one or more of the following on the inner wall: an inert liner or an inert coating.

6. The portable detection method for low-adsorption C4F7N mixed gas by heat-gas separation according to claim 1, characterized in that, The method of spatially isolating the main detection flow path from the heat source is to install the calibrator in a tilted and suspended manner inside the portable case, so that an independent heat dissipation air duct is formed between the side wall of the calibrator and the inner wall of the case.

7. The portable detection method for low-adsorption C4F7N mixed gas by heat-gas separation according to claim 1, characterized in that, Also includes: Clean gas is blown into the flow path during the detection gap to purge and replace the residual C4F7N gas in the flow path.

8. A portable detection device for low-adsorption C4F7N mixed gas using a heat-gas separation method, characterized in that, Using the method as described in any one of claims 1 to 7, the apparatus comprises: Portable case with cushioning components; The calibrator is installed in the box in an inclined suspension manner through a telescopic pivot and hinge hole. An independent heat dissipation air duct is formed between the side wall of the calibrator and the inner wall of the box. Ventilation openings are provided at corresponding positions in the box. A gas flow path module is arranged on a mounting plate. The inner wall material of the gas flow path module is determined by the material classification results. The inner wall roughness Ra is not greater than 0.4µm, and the sealing element is made of perfluoroether rubber. The temperature control unit, including a temperature sensing element and a temperature control cover, is used to precisely control the temperature of the gas flowing through the flow path; The cleaning device, including an exhaust pump and clean gas piping, is used to purge residual gas in the flow path during the detection interval.

9. The portable detection device for low-adsorption C4F7N mixed gas of thermal-gas separation type according to claim 8, characterized in that, The buffer components include a crossbeam, buffer springs, and rubber undersupport pads, which are distributed at the bottom and front face of the box.

10. The portable detection device for low-adsorption C4F7N mixed gas of heat-gas separation type according to claim 8, characterized in that, The tilt angle of the calibrator is 15° to 30°.

11. The portable detection device for low-adsorption C4F7N mixed gas of thermal-gas separation type according to claim 8, characterized in that, The temperature control unit stably controls the gas temperature at 25±1℃; The mounting plate has a hollow structure in the gas flow path module installation area, which, together with the temperature control cover, forms a localized precise temperature control zone.

12. A computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method as described in any one of claims 1-7.

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

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