Tio2 2 particle packed DBD-based SF 6 degradation performance evaluation method and system

Abstract

A TiO2 particle packed DBD-based SF6 degradation performance evaluation method, comprising: selecting nano TiO2 particles as a packing medium, researching a SF6 plasma discharge decomposition process on the basis of DBD, using a test area to offline analyze the concentration of SF6, and measuring discharge power by means of an oscilloscope; on the basis of DBD plasma degradation technology, evaluating the degradation effect of DBD on SF6; and, by means of a degradation product measured by a GC-MS, performing performance evaluation on the catalytic effect of the TiO2 packing medium.

Description

A performance evaluation method and system for SF6 degradation based on TiO2 particle-filled DBD Technical Field

[0001] The present invention belongs to the field of high voltage insulation technology and environmental protection, and particularly relates to a catalytic effect and performance evaluation method for SF6 degradation based on TiO2 particle-filled DBD. Background Art

[0002] SF6 is widely used in the electrical industry and other fields due to its excellent insulating properties. However, due to its strong greenhouse effect, the global atmospheric concentration of SF6 has reached 105 tons in recent years. Due to its stable chemical properties, SF6 can persist stably in the atmosphere, making its harmless treatment of SF6 of great environmental significance in today's society. Currently, DBD technology has been proven to be a reliable method for treating industrial waste gases such as SF6. However, the waste gas degradation rate and energy efficiency of DBD discharge are difficult to guarantee, leaving significant room for improvement. Research has found that combining it with a catalyst to form a packed-bed dielectric barrier discharge technology can effectively overcome these challenges and improve the discharge intensity. Research has shown that factors such as the type and size of filler particles significantly affect the DBD discharge process. Filler particles provide surface active sites for the reaction, ultimately affecting the CO2 reduction process. Compared to a system without filler, the addition of filler materials can significantly improve the discharge system. However, existing research on the degradation of SF6 by filler materials is limited. Therefore, further research on filler materials is necessary to find better solutions for the treatment of SF6 and its products.

[0003] In terms of the selection of filler materials, TiO2 generally has three crystal forms: rutile, anatase, and brookite. Anatase is the most commonly obtained crystal form in nanomaterials. The anatase phase is not as stable as the rutile phase and contains a large number of defects on the surface, which gives it excellent catalytic activity and is the crystal form with the best catalytic effect. Nano-TiO2 has very valuable properties, with high hardness, density, dielectric constant and refractive index. Nano-TiO2 also has good thermal stability, chemical stability, and good optical, mechanical and electrical properties. Studies have found that TiO2 has high catalytic activity, strong photooxidation and reduction capabilities, and exhibits good catalytic effects.

[0004] Summary of the Invention

[0005] The purpose of this section is to summarize some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract and title of this application to avoid obscuring the purpose of this section, the abstract and the title of the invention, and such simplifications or omissions should not be used to limit the scope of the present invention.

[0006] In view of the above existing problems, the present invention is proposed.

[0007] Therefore, a performance evaluation method for SF6 degradation based on TiO2 particle-filled DBD is provided. The purpose of the present invention is to address the problems that the current research on SF6 treatment by DBD is not in-depth enough and is not applicable to industrial practice. A catalytic effect and performance evaluation method for SF6 degradation based on TiO2 particle-filled DBD is provided, ultimately providing a reliable experimental basis and technical support for the efficient and harmless industrial treatment of SF6 waste gas, thereby reducing the harm caused by SF6 gas to the environment.

[0008] To solve the above technical problems, the present invention provides the following technical solution: a performance evaluation method for SF6 degradation based on TiO2 particle-filled DBD, comprising:

[0009] Nano-TiO2 particles were selected as the filling medium, and the plasma discharge decomposition process of SF6 was studied based on DBD. The SF6 concentration was analyzed offline in the detection area, and the discharge power was measured by an oscilloscope. The degradation effect of DBD on SF6 was evaluated based on the DBD plasma degradation technology. The catalytic effect of the TiO2 filling medium was evaluated by measuring the degradation products using GC-MS.

[0010] As a preferred embodiment of the performance evaluation method for SF6 degradation based on TiO2 particle-filled DBD of the present invention, the detection area includes online detection and offline detection, and the online detection area includes an oscilloscope and an emission spectrometer to detect plasma discharge parameters in real time;

[0011] The offline detection area includes a gas chromatograph, a gas chromatography-mass spectrometer, and an infrared Fourier transform spectrometer to perform offline analysis of SF6 concentration and the types and concentrations of decomposition products;

[0012] The DBD discharge process is monitored in real time by an oscilloscope, and the key physical parameters of the discharge process, such as discharge voltage, discharge current, and charge transfer, are measured.

[0013] As a preferred embodiment of the performance evaluation method for SF6 degradation based on TiO2 particle-filled DBD according to the present invention, the discharge power is measured by the Lissajous figure method, and the product of the area of ​​the parallelogram ABCD and the discharge frequency corresponds to the plasma discharge power expressed as: P = fS ABCD

[0014] Among them, P is the discharge power of plasma, f is the discharge frequency, S ABCD The area of ​​parallelogram ABCD corresponds to the energy of one discharge cycle.

[0015] As a preferred embodiment of the performance evaluation method for SF6 degradation based on TiO2 particle-filled DBD according to the present invention, the plasma degradation technology includes a high-efficiency plasma degradation technology taking both degradation rate and energy efficiency into consideration;

[0016] In the DBD reactor, plasma degradation technology and TiO2 particle photocatalytic degradation technology work together to improve the degradation rate and energy efficiency of SF6. The high-energy electrons and active oxygen species in the plasma destroy the molecular structure of SF6, causing SF6 to be photocatalytically affected by the TiO2 particles. The photocatalytic activity of the TiO2 particles is enhanced, and the degradation rate of SF6 is subsequently improved. At the same time, the effects of the filling amount of TiO2 particles and the operating parameters of the reactor on the degradation rate and energy efficiency are considered and optimized to achieve the best degradation effect and energy utilization efficiency.

[0017] As a preferred embodiment of the performance evaluation method for SF6 degradation based on TiO2 particle-filled DBD according to the present invention, the degradation rate includes determining the SF6 degradation rate by measuring the concentration of SF6 before and after DBD degradation:

[0018] Where DRE is the degradation rate, C in is the initial concentration of SF6, C out It is the concentration of SF6 after degradation, in ppm.

[0019] As a preferred embodiment of the performance evaluation method for SF6 degradation based on TiO2 particle-filled DBD according to the present invention, the energy efficiency includes the discharge energy density of the reactor when the reactor degrades the flowing SF6 gas, which is expressed as:

[0020] The energy efficiency is expressed as:

[0021] Where SED is the discharge energy density, in J / mL, Q g is the reaction gas flow rate, in mL / min, M is the molar mass of SF6 molecules, in g / mol, V0 is the molar volume of gas under experimental conditions, in L / mol, and EY is the energy efficiency, in g / kWh.

[0022] As a preferred embodiment of the performance evaluation method for SF6 degradation based on TiO2 particle-filled DBD according to the present invention, the GC-MS measurement includes the measurement results of GC-MS, and the calculation formula of the selectivity of the gas product is expressed as follows:

[0023] Among them, C kis the volume fraction of k gas, and S is the percentage of one decomposition gas in the total decomposition amount of SF6.

[0024] Another object of the present invention is to provide a performance evaluation method and system for SF6 degradation based on TiO2 particle-filled DBD. Nano-TiO2 particles are selected as the filling medium, and the plasma discharge decomposition process of SF6 is studied based on DBD. Secondly, the catalytic effect of the TiO2 filling medium is evaluated from the aspects of DBD plasma discharge characteristics, SF6 degradation rate, energy efficiency and degradation products through different instruments.

[0025] A performance evaluation system for SF6 degradation based on TiO2 particle-filled DBD is characterized by comprising a detection module, a discharge module, a plasma degradation module, and a gas product selection module.

[0026] The detection module detects the concentration and composition of SF6 gas and the concentration and composition of gas products generated during the degradation process.

[0027] The discharge module decomposes SF6 gas into low fluoride and free radicals through high voltage discharge.

[0028] The plasma degradation module uses TiO2 particles to fill DBD in a plasma reactor and evaluates the degradation effect on SF6 through plasma reaction.

[0029] The gas product selection module is used to select appropriate gas products to reduce SF6 gas pollution.

[0030] A computer device includes a memory and a processor, wherein the memory stores a computer program, and is characterized in that when the processor executes the computer program, steps of a method for evaluating the performance of TiO2 particle-filled DBD in degrading SF6 are implemented.

[0031] A computer-readable storage medium having a computer program stored thereon, characterized in that when the computer program is executed by a processor, the steps of a method for evaluating the performance of TiO2 particle-filled DBD in degrading SF6 are implemented.

[0032] The beneficial effects of the present invention are as follows: the present invention can reveal the mechanism of the influence of TiO2 filling on DBD degradation of SF6; it can be used to analyze the essential reason why the filling material promotes DBD degradation of SF6; the technical solution proposed by the present invention can solve the shortcomings of traditional DBD degradation of SF6, and through analysis, it can not only save experimental costs but also reflect the microscopic interaction mechanism of gas and solid phase materials; the present invention proposes a catalytic effect and performance evaluation method for SF6 degradation based on TiO2 particle filling DBD, which ultimately provides a reliable experimental basis and technical support for industrial efficient and harmless treatment of SF6 waste gas, thereby reducing the harm caused by SF6 gas to the environment, and has broad application prospects in this field. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. Those skilled in the art can also derive other drawings based on these drawings without inventive work. Among them:

[0034] FIG1 is a schematic diagram of a working method of a performance evaluation method for degrading SF6 based on TiO2 particle-filled DBD provided by one embodiment of the present invention.

[0035] FIG2 shows voltage and current waveforms during a plasma discharge process under TiO2 particle filling, according to a method for evaluating the performance of a TiO2 particle-filled DBD for degrading SF6, provided by an embodiment of the present invention.

[0036] FIG3 is an overlay diagram of Lissajous figures of different power discharge systems of a performance evaluation method for SF6 degradation based on TiO2 particle-filled DBD provided by one embodiment of the present invention.

[0037] FIG4 shows the degradation rate of SF6 at different input powers according to a performance evaluation method for SF6 degradation based on TiO2 particle-filled DBD provided by one embodiment of the present invention.

[0038] FIG5 shows the energy efficiency distribution under different input powers of a performance evaluation method for SF6 degradation based on TiO2 particle-filled DBD provided by an embodiment of the present invention.

[0039] FIG6 is an FTIR result of degradation products in a TiO2 system according to a performance evaluation method for SF6 degradation based on TiO2 particle-filled DBD provided by one embodiment of the present invention.

[0040] FIG7 shows the proportions of three gas products under different input powers according to a performance evaluation method for SF6 degradation based on TiO2 particle-filled DBD provided by an embodiment of the present invention.

[0041] FIG8 is a schematic diagram of the working process of a performance evaluation system for SF6 degradation based on TiO2 particle-filled DBD provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0042] To make the above-mentioned objects, features, and advantages of the present invention more clearly understood, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. It is obvious that the described embodiments are only part of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in this field without making creative efforts should fall within the scope of protection of the present invention.

[0043] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. 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.

[0044] Secondly, the term "one embodiment" or "embodiment" herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in various places throughout this specification does not necessarily refer to the same embodiment, nor does it constitute a separate or selective embodiment that is mutually exclusive with other embodiments.

[0045] The present invention is described in detail with reference to schematic diagrams. For ease of illustration, cross-sectional views of device structures may be partially enlarged and not to scale when describing embodiments of the present invention. Furthermore, the schematic diagrams are merely illustrative and should not limit the scope of the present invention. Furthermore, in actual production, the three-dimensional dimensions of length, width, and depth should be included.

[0046] In the description of the present invention, it should be noted that the terms "upper, lower, inner, and outer" and other references to orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first, second, or third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0047] In this disclosure, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly. For example, they may refer to fixed, removable, or integral connections. They may also refer to mechanical, electrical, or direct connections, indirect connections through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this disclosure.

[0048] Example 1

[0049] 1 , which is a first embodiment of the present invention, provides a method for evaluating the performance of SF6 degradation based on TiO2 particle-filled DBD, comprising:

[0050] S1: Nano-TiO2 particles are selected as the filling medium, and the plasma discharge decomposition process of SF6 is studied based on DBD. The SF6 concentration is analyzed offline in the detection area, and the discharge power is measured by an oscilloscope.

[0051] Furthermore, the detection area is divided into online detection and offline detection. The online detection area includes an oscilloscope and an emission spectrometer to detect plasma discharge parameters in real time; the offline detection area includes a gas chromatograph, a gas chromatography-mass spectrometer and an infrared Fourier spectrometer to perform offline analysis of SF6 concentration and the type and concentration of decomposition products; the DBD discharge process is monitored in real time by an oscilloscope and the key physical parameters of the discharge process, such as discharge voltage, discharge current and charge transfer, are measured.

[0052] Electrical parameters such as discharge voltage, current, and power are important indicators for analyzing plasma properties. Using an oscilloscope, the DBD discharge process can be monitored in real time, and key physical parameters such as discharge voltage, discharge current, and charge transfer can be measured. These parameters are crucial for analyzing the impact of discharge physical parameters when TiO2 particles are used as the filling medium.

[0053] It should be noted that the input power can be obtained directly from the power supply end, the discharge power is obtained by calculating the charge-voltage (QU) Lissajous figure, the discharge amount Q is measured by a 0.47μF sampling capacitor connected in series in the reactor (Q=CUC), and the discharge voltage and current as well as the Lissajous figure are measured by a Tektronix TDS320 digital oscilloscope; the SF6 residual gas concentration is quantitatively detected by a gas chromatograph; the SF6 degradation products are qualitatively detected by an infrared Fourier analyzer, with a spectral detection range of 400 to 2000cm-1, a detection accuracy of 1nm, and 10 scans; the gas cell optical path length is 10cm; SOF2, SO2F2 and SO2 degradation products are quantitatively detected by a gas chromatography-mass spectrometer, 99.999% He is used as the carrier gas, and the absorption peak area external standard method is used as the quantitative method.

[0054] It should also be noted that the discharge power is an important indicator reflecting the working characteristics of the reactor through the Lissajous figure method. The Lissajous figure method can reflect the relationship between the transport charge and voltage at both ends of the reactor during the DBD process. The product of the area of ​​the parallelogram ABCD and the discharge frequency corresponds to the plasma discharge power expression: P = fS ABCD

[0055] Among them, P is the discharge power of plasma, f is the discharge frequency, S ABCD The area of ​​parallelogram ABCD corresponds to the energy of one discharge cycle.

[0056] S2: Evaluate the degradation effect of DBD on SF6 based on DBD plasma degradation technology.

[0057] Furthermore, in a dielectric barrier discharge structure, at least one layer of insulating dielectric is added to the air gap between the two metal electrodes to act as a "discharge barrier." Under the action of a high-frequency electric field, the voltage across the air gap rises to a certain value, causing the air gap to breakdown. At the same time, the dielectric in the air gap is charged and generates a reverse capacitance voltage. When this reverse voltage increases to a certain level, it weakens the voltage across the air gap, causing it to be less than the breakdown value, thereby "blocking" the development of the discharge until the applied voltage alternates to the negative half-cycle or the next cycle (DC), at which point air gap discharge reoccurs. This high-frequency discharge formation and barrier disappearance process causes a large number of free electrons and excited-state particles to accumulate in the discharge region, forming a plasma.

[0058] It should be noted that efficient plasma degradation technology takes into account both degradation rate and energy efficiency; in the DBD reactor, plasma degradation technology and TiO2 particle photocatalytic degradation technology work together to improve the degradation rate and energy efficiency of SF6. The high-energy electrons and active oxygen species in the plasma destroy the molecular structure of SF6, so that SF6 is photocatalytically affected by TiO2 particles. The photocatalytic activity of TiO2 particles is enhanced, and the degradation rate of SF6 is subsequently improved. At the same time, the effects of the filling amount of TiO2 particles and the operating parameters of the reactor on the degradation rate and energy efficiency are considered and optimized to achieve the best degradation effect and energy utilization efficiency.

[0059] It should also be noted that by measuring the concentration of SF6 before and after DBD degradation, the degradation rate of SF6 was determined to be:

[0060] Where DRE is the degradation rate, C in is the initial concentration of SF6, C out It is the concentration of SF6 after degradation, in ppm.

[0061] It should also be noted that when the reactor degrades the flowing SF6 gas, the discharge energy density of the reactor is expressed as:

[0062] The energy efficiency is expressed as:

[0063] Where SED is the discharge energy density, in J / mL, Q g is the reaction gas flow rate, in mL / min, M is the molar mass of SF6 molecules, in g / mol, V0 is the molar volume of gas under experimental conditions, in L / mol, and EY is the energy efficiency, in g / kWh.

[0064] S3: Performance evaluation of the catalytic effect of the TiO2 filled media by measuring degradation products through GC-MS.

[0065] Furthermore, based on the GC-MS measurement results, the selectivity of gas products can be calculated as follows:

[0066] Among them, C k is the volume fraction of k gas, and S is the percentage of one decomposition gas in the total decomposition amount of SF6.

[0067] It should be noted that packed-bed dielectric barrier discharge (DBD) combines this with dielectric barrier discharge (DBD). By filling the reactor with specific catalyst particles or powder, introducing the desired reaction gas or liquid, and heating it, the catalytic process can be achieved. Traditional packed-bed reactors are very similar to coaxial DBRs, except that they typically lack a central inner electrode. Therefore, by adding filler particles or powder to the coaxial DBD discharge tube, a packed-bed DBD discharge can be formed. The filler particles or powder not only have a catalytic effect but may also promote discharge.

[0068] Example 2

[0069] 2 to 7 , which are an embodiment of the present invention, provide a performance evaluation method for SF6 degradation based on TiO2 particle-filled DBD. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through experiments.

[0070] Figure 2 is a voltage and current waveform diagram of the plasma discharge process under TiO2 particle filling involved in the present invention. The burr and filament discharge phenomena in the TiO2 system are significantly reduced, which indicates that the addition of TiO2 causes part of the current in the system to be used for discharge on the particle surface, and the entire discharge process is relatively stable.

[0071] Figure 3 shows an overlay of Lissajous figures for the various power discharge systems of the present invention. The addition of TiO2 makes the Lissajous figures more elliptical. In the TiO2-filled system, as the input power increases from 60W to 90W, the slopes of the discharge segments AB and CD increase significantly, as does the area of ​​the figures. This indicates that the change in power increases the proportion of the discharge process within a cycle, thereby increasing the discharge power.

[0072] Figure 4 shows the SF6 degradation rate under different input powers for the present invention. As the input power gradually increases from 60W to 90W, the DRE of the TiO2 particle-filled system eventually approaches 100%. This demonstrates that the TiO2 filler material strongly promotes the SF6 degradation process. This facilitates the discharge process, allowing for more complete contact between SF6 molecules and active particles. Furthermore, the surface of the filler particles may participate in the SF6 degradation reaction, potentially allowing chemical interactions such as adsorption and catalytic activation to occur on the TiO2 particle surface, resulting in a more effective degradation system.

[0073] Figure 5 shows the energy efficiency distribution under different input powers. When the input power is 60W, the degradation energy efficiency of the TiO2-filled system is 10.35g / kWh. As the input power gradually increases to 80W, the degradation energy efficiency gradually increases to 13.19g / kWh. When the input power increases from 80W to 90W, the degradation energy efficiency decreases to 13.06g / kWh, and the degradation energy efficiency gradually decreases. The TiO2 system can still maintain a high degradation energy efficiency while the input power continues to increase.

[0074] Figure 6 shows the FTIR results of the degradation products using the TiO2 system of the present invention. The gas products after SF6 degradation are concentrated in the 400-1600 cm-1 band, and the degradation products are mainly SO2, SOF2, SO2F2, OF2, and SF4.

[0075] Figure 7 shows the proportions of the three gas products at different input powers. As can be seen from the figure, as the input power increases from 60W to 90W, SO2F2 shows a gradual downward trend, with the product selectivity dropping from 39% to 15%. SO2 shows a gradual upward trend, with the product selectivity rising from 7% to 17%. SOF2 maintains a relatively low proportion, ultimately reaching a product selectivity of 5%. This indicates that TiO2 can promote the formation of SO2, a degradation product of SF6, and inhibit the formation of SOF-like products (SO2F2). Since SO2F2 is more difficult to handle and recover, it reduces the difficulty of recovering and treating SF6 degradation products to a certain extent.

[0076] Based on the above experimental results, TiO2 as a filling medium can ensure a high degradation rate, stable degradation energy efficiency and good product selectivity, and is a recommended filling medium.

[0077] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to 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.

[0078] Example 3

[0079] The third embodiment of the present invention is different from the first two embodiments in that:

[0080] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0081] The logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing the logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (e.g., a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device). For purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by, or in conjunction with, an instruction execution system, apparatus, or device.

[0082] More specific examples (a non-exhaustive list) of computer-readable media include the following: an electrical connection with one or more wires (electronic devices), a portable computer disk cartridge (magnetic devices), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disc read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering, or processing in another suitable manner as necessary, and then stored in a computer memory.

[0083] It should be understood that various parts of the present invention can be implemented using hardware, software, firmware, or a combination thereof. In the above-described embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0084] Example 4

[0085] 8 , which is a fourth embodiment of the present invention, provides a performance evaluation system for SF6 degradation based on TiO2 particle-filled DBD, including a detection module, a discharge module, a plasma degradation module, and a gas product selection module.

[0086] The detection module detects the concentration and composition of SF6 gas and the concentration and composition of gas products generated during the degradation process.

[0087] The discharge module decomposes SF6 gas into low fluoride and free radicals through high voltage discharge.

[0088] In the plasma degradation module, TiO2 particles are used to fill DBD in a plasma reactor, and the degradation effect on SF6 is evaluated through plasma reaction.

[0089] The gas product selection module is used to select appropriate gas products to reduce SF6 gas pollution.

[0090] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to 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 performance evaluation method for SF6 degradation based on TiO2 particle filled DBD, characterized in that: include, Nano-TiO2 particles were selected as the filling medium, and the plasma discharge decomposition process of SF6 was studied based on DBD. The SF6 concentration was analyzed offline in the detection area, and the discharge power was measured by an oscilloscope. The degradation effect of DBD on SF6 was evaluated based on DBD plasma degradation technology; The catalytic performance of the TiO2 filled media was evaluated by measuring the degradation products via GC-MS.

2. A performance evaluation method for SF6 degradation based on TiO2 particle-filled DBD as claimed in claim 1, characterized in that: The detection area includes an online detection area and an offline detection area, and the online detection area includes an oscilloscope and an emission spectrometer to detect plasma discharge parameters in real time; The offline detection area includes a gas chromatograph, a gas-mass spectrometer-chromatograph and an infrared Fourier transform spectrometer to perform offline analysis of SF6 concentration and the types and concentrations of decomposition products; The DBD discharge process is monitored in real time by an oscilloscope, and the key physical parameters of the discharge process, such as discharge voltage, discharge current, and charge transfer, are measured.

3. A performance evaluation method for SF6 degradation based on TiO2 particle-filled DBD as claimed in claim 2, characterized in that: The discharge power is measured by the Lissajous figure method. The product of the area of ​​the parallelogram ABCD and the discharge frequency corresponds to the discharge power of the plasma expressed as: P = fS ABCD Where P is the discharge power of the plasma, f is the discharge frequency, S ABCD The area of ​​parallelogram ABCD corresponds to the energy of one discharge cycle.

4. A performance evaluation method for SF6 degradation based on TiO2 particle filled DBD as claimed in claim 3, characterized in that: The plasma degradation technology includes an efficient plasma degradation technology that takes both degradation rate and energy efficiency into consideration; In the DBD reactor, plasma degradation technology and TiO2 particle photocatalytic degradation technology work together to improve the degradation rate and energy efficiency of SF6. The high-energy electrons and active oxygen species in the plasma destroy the molecular structure of SF6, so that SF6 is photocatalytically affected by the TiO2 particles. The photocatalytic activity of the TiO2 particles is enhanced, and the degradation rate of SF6 is subsequently improved. At the same time, the effects of the filling amount of TiO2 particles and the operating parameters of the reactor on the degradation rate and energy efficiency are considered and optimized to achieve the best degradation effect and energy utilization efficiency.

5. A performance evaluation method for SF6 degradation based on TiO2 particle-filled DBD as claimed in claim 4, characterized in that: The degradation rate includes determining the degradation rate of SF6 by measuring the concentration of SF6 before and after DBD degradation: Where DRE is the degradation rate, C in is the initial concentration of SF6, C out It is the concentration of SF6 after degradation, in ppm.

6. A performance evaluation method for SF6 degradation based on TiO2 particle-filled DBD as claimed in claim 5, characterized in that: The energy efficiency includes the discharge energy density of the reactor when the reactor degrades the flowing SF6 gas, expressed as: At this time, the energy efficiency is expressed as: Where SED is the discharge energy density, in J / mL, Q g is the reaction gas flow rate, in mL / min, M is the molar mass of SF6 molecules, in g / mol, V0 is the molar volume of gas under experimental conditions, in L / mol, and EY is the energy efficiency, in g / kWh.

7. A performance evaluation method for SF6 degradation based on TiO2 particle filled DBD as claimed in claim 6, characterized in that: The GC-MS measurement includes the measurement results of GC-MS, and the calculation formula of the selectivity of the gas product is expressed as: Among them, C k is the volume fraction of k gas, and S is the percentage of one decomposition gas in the total decomposition amount of SF6.

8. A system using the performance evaluation method for degrading SF6 based on TiO2 particle-filled DBD as described in any one of claims 1 to 7, characterized in that: It includes a detection module, a discharge module, a plasma degradation module, and a gas product selection module; The detection module detects the concentration and composition of SF6 gas and the concentration and composition of gas products generated during the degradation process; The discharge module decomposes SF6 gas into low fluoride and free radicals through high voltage discharge; The plasma degradation module uses TiO2 particles to fill DBD in a plasma reactor and evaluates the degradation effect on SF6 through plasma reaction; The gas product selection module is used to select appropriate gas products to reduce SF6 gas pollution.

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

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

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