Insulating oil dissolved gas membrane separation device and mass spectrometry detection method

Abstract

The application discloses an insulating oil dissolved gas membrane separation device and a mass spectrum detection method, belongs to the technical field of power equipment state monitoring, and solves the problem of how to improve the membrane separation and detection efficiency.The device comprises a top cover plate, a base plate, an annular sealing gasket, an oil-gas separation membrane, a metal supporting net, a capillary, a valve and a heating resistance wire and the like.The device heats the insulating oil sample by controlling the temperature of an external oil sample heating device, then inputs the insulating oil sample through an oil inlet hole, controls the temperature of the heating resistance wire to heat the base plate, keeps the temperature gradient on both sides of the oil-gas separation membrane uniform, and significantly improves the resolution efficiency of the characteristic dissolved gas from the surface of the oil-gas separation membrane.The mass spectrum detection method establishes the quantitative relationship between the ionization efficiency, ion response, membrane permeation efficiency and signal intensity, realizes the accurate calculation of the characteristic gas concentration, and is suitable for the online real-time monitoring of the dissolved gas of the transformer insulating oil.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of power equipment state monitoring, and relates to an insulating oil dissolved gas membrane separation device and a mass spectrometric detection method. BACKGROUND

[0002] As the core equipment of power system energy transmission and distribution, the operation state of a transformer is directly related to the safety and stability of a power grid. When insulation aging, partial discharge or overheating failure occurs inside the transformer, insulating oil will decompose to produce characteristic gases such as hydrogen (H2), methane (CH4), ethane (C2H6), ethylene (C2H4), acetylene (C2H2), carbon monoxide (CO), carbon dioxide (CO2) and the like. The composition and concentration changes of these gases are the key basis for fault diagnosis. Therefore, realizing efficient separation and real-time monitoring of the dissolved gases in the oil has become an important technical requirement for power equipment state monitoring.

[0003] Although traditional dissolved gas analysis techniques in oil (such as gas chromatography and photoacoustic spectroscopy) have high accuracy, they have problems such as long sample pretreatment time, low automation level and difficulty in realizing online monitoring. Membrane separation technology has gradually become a research hotspot due to its fast response, simple structure and easy integration. However, the high viscosity characteristics of insulating oil and the temperature fluctuations during operation result in low mass transfer efficiency of the gas in the membrane, and the traditional method of heating the oil liquid only can easily cause uneven temperature gradient on both sides of the membrane, affecting the desorption stability and detection consistency of the gas, which limits the application of this technology in engineering. SUMMARY

[0004] The technical solution of the application is used to solve the problem of how to improve the membrane separation and detection efficiency.

[0005] The application solves the above technical problems by the following technical solution:

[0006] The application provides an insulating oil dissolved gas membrane separation device, which comprises an upper cover plate, a base plate, an annular sealing gasket, an oil-gas separation membrane, a metal support net, a capillary, a valve, a heating resistance wire, an oil inlet hole, an oil outlet hole and an external oil sample heating device; the upper cover plate is symmetrically provided with the oil inlet hole and the oil outlet hole, the output port of the external oil sample heating device is in sealing connection with the oil inlet hole, the annular sealing gasket is arranged between the upper cover plate and the base plate, the upper cover plate and the base plate are in alignment and sealing compression to form an oil passage, a circular groove is formed in the top of the base plate, the heating resistance wire in a spiral shape is uniformly embedded in the base plate, the metal support net is installed in the circular groove, the oil-gas separation membrane is attached to the upper surface of the metal support net, a through hole is formed downward at the center of the circular groove in the top of the base plate, the input end of the capillary is installed in the through hole and extends downward, the input end of the capillary is in abutment with the lower surface of the metal support net, the valve is installed on the capillary, and the output end of the capillary is in sealing connection with a mass spectrometer; the external oil sample heating device is used in cooperation with the heating resistance wire to keep the temperature gradient on both sides of the oil-gas separation membrane uniform.

[0007] Further, the external oil sample heating device comprises an insulating oil conveying pipeline and a constant-temperature water bath heating device; the insulating oil conveying pipeline is in the shape of a plurality of U-shaped pipelines connected in series, the insulating oil conveying pipeline is arranged in the constant-temperature water bath heating device, constant-temperature hot water is filled in the constant-temperature water bath heating device, the input port of the insulating oil conveying pipeline is used for inputting insulating oil, and the output port of the insulating oil conveying pipeline is in sealing connection with the oil inlet hole.

[0008] Further, the input port of the insulating oil conveying pipeline is arranged below the constant-temperature water bath heating device, and the output port of the insulating oil conveying pipeline is arranged above the constant-temperature water bath heating device.

[0009] Further, the distance between the inner hole walls of the oil inlet hole and the oil outlet hole away from each other is equal to the diameter of the circular groove formed in the top of the base plate.

[0010] Further, the oil outlet hole is connected to a peristaltic pump.

[0011] Further, the insulating oil dissolved gas membrane separation device further comprises a thermocouple, and the thermocouple is arranged in the oil passage.

[0012] Further, the oil-gas separation membrane adopts an AF2400 membrane.

[0013] Further, the heating resistance wire adopts a nickel-chromium alloy heating resistance wire.

[0014] The application provides an insulating oil dissolved gas membrane separation device, which comprises an upper cover plate, a base plate, an annular sealing gasket, an oil-gas separation membrane, a metal support net, a capillary, a valve, a heating resistance wire, an oil inlet hole and an oil outlet hole.

[0015] Further, the oil outlet hole is connected to a peristaltic pump through a PTFE tube to control the flow rate of the insulating oil sample into the oil inlet hole, the heating resistance wire is turned on to heat the base plate, the insulating oil sample is input from the oil inlet hole, the insulating oil sample passes through the oil liquid channel, at this time, the oil-gas separation membrane separates the oil liquid from the characteristic dissolved gas, the characteristic dissolved gas is collected in the circular groove formed at the top of the base plate, finally, the characteristic dissolved gas is sent into a mass spectrometer through the capillary for quantitative detection, and the remaining oil sample is output from the oil outlet hole and recycled.

[0016] Further, the distance between the inner hole walls of the oil inlet hole and the oil outlet hole away from each other is equal to the diameter of the circular groove formed at the top of the base plate.

[0017] Further, the oil-gas separation membrane adopts an AF2400 membrane.

[0018] Further, the heating resistance wire adopts a nickel-chromium alloy heating resistance wire.

[0019] The application further provides a mass spectrometric detection method based on the above-mentioned insulating oil dissolved gas membrane separation device, which comprises the following steps.

[0020] S1, according to the flow rate and signal intensity relationship of the characteristic dissolved gas, the ionization efficiency parameter is solved, and the specific method is as follows: the flow rate and signal intensity relationship of a plurality of different characteristic dissolved gases is obtained by using membrane sampling and mass spectrometric detection, the experimental data of the flow rate and signal intensity of the plurality of different characteristic dissolved gases are linearly fitted, the relative ionization efficiency of the plurality of different characteristic dissolved gases is calculated by combining the partial pressure information of the gas components and the slope information of the fitted straight line;

[0021] S2, according to the relationship between the dissolved oxygen concentration and the signal intensity, the ion response parameter is solved, and the specific method is: the dissolved oxygen concentration in the insulating oil is changed by using pure nitrogen to perform headspace purging, and the mass spectrometer is used to detect the dissolved oxygen concentration synchronously, the relationship curve between the dissolved oxygen concentration and the signal intensity is obtained, the signal intensity of the dissolved oxygen is extracted from the spectrum, the relationship curve between the dissolved oxygen concentration and the signal intensity is drawn and linear fitting is performed, so that the ion response coefficient is obtained;

[0022] S3, the membrane permeation efficiency parameter is solved, and the specific method is: the membrane permeation efficiency under different influence factors is calculated, and the Arrhenius formula is used to describe the influence function of temperature on the membrane permeation efficiency, so that the quantitative relationship between the membrane permeation efficiency under different influence factors and each influence factor is obtained;

[0023] S4, the concentration of the characteristic gas is solved by the signal intensity in the mass spectrum, and the specific method is: under the condition that the temperature, the gas type and the membrane specification factor do not change, the signal intensity in the mass spectrum is proportional to the concentration of the characteristic gas, so that the quantitative relationship between the concentration of the characteristic gas and the signal intensity in the mass spectrum is obtained.

[0024] Further, the calculation formula of the relative ionization efficiency of the plurality of different characteristic dissolved gases in step S1 is as follows:

[0025] (1)

[0026] wherein, is the ionization efficiency of the characteristic dissolved gas x, is the target ion concentration after ionization of the characteristic dissolved gas x, is the original concentration of the characteristic dissolved gas x, is the ionization efficiency of argon, is the relative ionization efficiency of the characteristic dissolved gas x relative to argon.

[0027] Further, the calculation formula of the ion response coefficient in step S2 is as follows:

[0028] (2)

[0029] wherein, represents the ion response parameter, represents the membrane permeation efficiency at standard conditions, represents the proportion of the ion concentration reaching the mass spectrometer to the ion concentration separated from the insulating oil, represents the amplification multiple.

[0030] Further, the calculation of the membrane permeation efficiency under different influencing factors in step S3 and the description of the temperature influence function on the membrane permeation efficiency by using Arrhenius formula to obtain the quantitative relationship between the membrane permeation efficiency under different influencing factors and the influencing factors are as follows:

[0031] Membrane permeation efficiency under different influencing factors is expressed as:

[0032] (3)

[0033] Under the given flow rate and pressure conditions, the temperature influence function on the membrane permeation efficiency is described by Arrhenius formula as follows:

[0034] (4)

[0035] The quantitative relationship between the membrane permeation efficiency under different influencing factors and the influencing factors is obtained by combining formula (3) and formula (4) as follows:

[0036] (5)

[0037] Wherein, T is the membrane surface temperature, is the temperature influence function on the membrane permeation efficiency, is the membrane permeation efficiency under standard conditions, R is the gas constant, is the permeation activation energy.

[0038] Further, the determination method of the membrane permeation efficiency under standard conditions is as follows: using different characteristic dissolved gas insulating oil with fixed concentration as experimental samples, obtaining the detection signal intensity corresponding to the known concentration samples, and fitting to obtain the standard membrane permeation efficiency of different characteristic dissolved gases.

[0039] Further, the determination method of the permeation activation energy is as follows: the temperature is increased at equal intervals within a certain range, the characteristic dissolved gas is input into the mass spectrometer under the condition of one atmosphere, the relationship between the mass spectrum peak height of the characteristic dissolved gas and the temperature is obtained, and then the permeation activation energy of each characteristic dissolved gas is fitted. .

[0040] Further, the quantitative relationship between the characteristic gas concentration and the signal intensity in the mass spectrum in step S4 is as follows:

[0041] (6)

[0042] By combining formula (1), formula (2), formula (5) and formula (6), the following is obtained:

[0043] (7)

[0044] wherein, is the membrane permeation efficiency under different influencing factor conditions, represents an ion response parameter, represents the proportion of the ion concentration reaching the mass spectrometer to the ion concentration separated from the insulating oil, is the relative ionization efficiency of gas x relative to argon, is the signal intensity in the spectrum, represents the amplification factor.

[0045] The application also provides a device comprising a memory for storing a program supporting the processor to execute the above-mentioned mass spectrometry method and a processor configured to execute the program stored in the memory.

[0046] The application also provides a storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, performs the steps of the above-mentioned mass spectrometry method.

[0047] The application has the following beneficial effects:

[0048] The device of the application heats the insulating oil sample by controlling the temperature of the external oil sample heating device, then inputs the insulating oil sample through the oil inlet hole, controls the temperature of the heating resistance wire to heat the base plate, keeps the temperature gradient on both sides of the oil-gas separation membrane uniform, significantly improves the resolution efficiency of the characteristic dissolved gas from the surface of the oil-gas separation membrane, and is conducive to better separation of oil and gas, greatly improves the efficiency of membrane separation; through multi-parameter modeling of ionization efficiency, ion response, membrane permeation efficiency, etc., a quantitative relationship between signal intensity and gas concentration is established, and the accuracy and reliability of the detection result are improved; the device structure is compact, can be integrated with a miniature mass spectrometer, realizes continuous, automatic and quantitative detection of insulating oil dissolved gas, and meets the real-time sensing needs of intelligent power grids for equipment status. BRIEF DESCRIPTION OF DRAWINGS

[0049] Figure 1 is a structural cross-sectional schematic view of the insulating oil dissolved gas membrane separation device of the first embodiment of the application;

[0050] Figure 2 is a schematic view of the heating resistance wire embedded in the base plate of the insulating oil dissolved gas membrane separation device of the first embodiment of the application;

[0051] Figure 3 is a structural schematic view of the external oil sample heating device of the insulating oil dissolved gas membrane separation device of the first embodiment of the application;

[0052] Figure 4 is a flowchart of the mass spectrometry method of the second embodiment of the application;

[0053] Figure 5 This is a graph showing the relationship between the flow rate and signal intensity of seven characteristic dissolved gases in the mass spectrometry detection method of Embodiment 2 of the present invention.

[0054] Figure 6 This is a graph showing the relationship between dissolved oxygen concentration and signal intensity in the mass spectrometry detection method of Embodiment 2 of the present invention.

[0055] Figure 7 This is a standard membrane permeation efficiency fitting curve of seven characteristic dissolved gases in the mass spectrometry detection method of Embodiment 2 of the present invention;

[0056] Figure 8 This is a graph showing the relationship between peak height and temperature of the mass spectrometry peaks of seven characteristic dissolved gases in the mass spectrometry detection method of Embodiment 2 of the present invention. Detailed Implementation

[0057] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0058] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0059] Example 1

[0060] like Figure 1 As shown, this embodiment of the invention provides an insulating oil dissolution gas film separation device, including: an upper cover plate 10, a base plate 11, an annular sealing gasket 12, an oil-gas separation membrane 13, a metal support mesh 14, a capillary tube 15, a valve 16, a heating resistance wire 17, an oil inlet hole 18, an oil outlet hole 19, a thermocouple (not shown in the figure), and an external oil sample heating device.

[0061] Both the upper cover plate 10 and the base plate 11 are circular metal cylinders. The upper cover plate 10 has symmetrically opened oil inlet holes 18 and oil outlet holes 19. The output port of the external oil sample heating device is sealed and connected to the oil inlet hole 18. An annular sealing gasket 12 is provided between the upper cover plate 10 and the base plate 11. After the upper cover plate 10 and the base plate 11 are aligned and sealed and pressed together, an oil channel with a certain thickness gap is formed. The thermocouple is installed in the oil channel to monitor the temperature of the insulating oil in the oil channel.

[0062] Preferably, the distance between the inner walls of the oil inlet hole 18 and the oil outlet hole 19 that are far apart from each other is equal to the diameter of the circular groove opened on the top of the base plate 11. At this time, the contact area between the insulating oil and the oil-gas separation membrane 13 is the largest, and the membrane separation oil-gas separation effect is the best.

[0063] A circular groove is formed on the top of the base plate 11, and the metal support mesh 14 is installed in the circular groove. The oil-gas separation membrane 13 is attached to the upper surface of the metal support mesh 14. A through hole is formed downward at the center of the circular groove formed on the top of the base plate 11. The input end of the capillary tube 15 is installed in the through hole and extends downward. The input end of the capillary tube 15 abuts against the lower surface of the metal support mesh 14. A valve 16 is installed on the capillary tube 15, and the output end of the capillary tube 15 is sealed and connected to the mass spectrometer.

[0064] Preferably, the oil-gas separation membrane 13 is an AF2400 membrane.

[0065] Preferably, such as Figure 2 As shown, a spiral heating resistance wire 17 is uniformly embedded inside the base plate 11. The heating resistance wire 17 is made of nickel-chromium alloy heating resistance wire.

[0066] like Figure 3 As shown, the external oil sample heating device includes: an insulating oil conveying pipe 20 and a constant temperature water bath heating device 21; the insulating oil conveying pipe 20 is in the form of multiple U-shaped pipes connected in series, which is beneficial to increase the heating area; the insulating oil conveying pipe 20 is installed in the constant temperature water bath heating device 21, which is filled with constant temperature hot water for heating the insulating oil in the insulating oil conveying pipe 20; the inlet of the insulating oil conveying pipe 20 is located below the constant temperature water bath heating device 21, and the outlet of the insulating oil conveying pipe 20 is located above the constant temperature water bath heating device 21; the inlet of the insulating oil conveying pipe 20 is used to input insulating oil, and the outlet of the insulating oil conveying pipe 20 is sealed to the oil inlet 18 of the insulating oil dissolving gas film separation device.

[0067] The working process of the device is as follows:

[0068] The temperature of the external oil sample heating device is controlled to heat the insulating oil sample, which is then input through the oil inlet 18. Simultaneously, the temperature of the heating resistance wire 17 is controlled to heat the base plate 11, maintaining a uniform temperature gradient on both sides of the oil-gas separation membrane 13. This significantly improves the desorption efficiency of the characteristic dissolved gas from the surface of the oil-gas separation membrane 13, facilitating better oil-gas separation. The insulating oil sample passes through the oil channel, where the oil-gas separation membrane 13 separates the oil from the characteristic dissolved gas. The characteristic dissolved gas collects in a circular groove at the top of the base plate 11 and is finally sent to the mass spectrometer for quantitative detection through the capillary tube 15. The remaining oil sample is output from the oil outlet 19 and recovered. In addition, the oil outlet 19 is connected to a peristaltic pump through a PTFE tube to control the flow rate of the insulating oil sample introduced through the oil inlet 18, preventing the generation of air bubbles during the introduction of the insulating oil sample, which could affect the stability and accuracy of the detection.

[0069] Example 2

[0070] like Figure 4 As shown, this embodiment of the invention provides a mass spectrometry detection method based on the insulating oil dissolved gas film separation device of Embodiment 1, comprising the following steps:

[0071] Step 1: Solve for the ionization efficiency parameters based on the relationship between the flow rate and signal intensity of the characteristic dissolved gas.

[0072] By obtaining the relationship between the flow rate and signal intensity of dissolved gases with different characteristics (e.g., hydrogen (H2), methane (CH4), ethane (C2H6), ethylene (C2H4), acetylene (C2H2), carbon monoxide (CO), carbon dioxide (CO2)) and determining the ionization efficiency parameters, the ionization efficiency parameters can be determined. Figure 5 The figure shows the relationship between flow rate and signal intensity for seven characteristic dissolved gases. Linear fitting was performed on the experimental data of flow rate and signal intensity for these seven characteristic dissolved gases, revealing that the ionization efficiency is a directly proportional function. Combining the partial pressure information of the gas components and the slope of the fitted line, the relative ionization efficiency of different characteristic dissolved gases was calculated, i.e.:

[0073] (1)

[0074] in, The ionization efficiency of the characteristic dissolved gas x is given. The target ion concentration after ionization of a characteristic dissolved gas x (where x is hydrogen, methane, ethane, ethylene, acetylene, carbon monoxide, or carbon dioxide). Characteristic dissolved gas x initial concentration, For argon ionization efficiency, The relative ionization efficiency of the characteristic dissolved gas x relative to argon is given.

[0075] Step 2: Solve for the ion response parameters based on the relationship between dissolved oxygen concentration and signal intensity.

[0076] The ion response parameters are determined by the transmission, separation, and detection performance of the mass spectrometer itself. The dissolved oxygen concentration in the insulating oil is altered by headspace purging with pure nitrogen, while the dissolved oxygen concentration is simultaneously detected by the mass spectrometer. A curve showing the relationship between dissolved oxygen concentration and signal intensity is obtained. The signal intensity of dissolved oxygen is extracted from the spectrum, and a linear fit is performed on the curve showing the relationship between dissolved oxygen concentration and signal intensity to obtain the ion response coefficients. Figure 6 The figure shows the signal intensity relationship curves when the dissolved oxygen concentrations are 0.1 mmol / L, 0.2 mmol / L, 0.3 mmol / L, 0.4 mmol / L, and 0.5 mmol / L.

[0077] The formula for calculating the ion response coefficient is as follows:

[0078] (2)

[0079] in, Indicates the ion response parameters. This represents the membrane permeation efficiency under standard conditions (1 atmosphere, 25°C). This indicates the ratio of the ion concentration reaching the mass spectrometer to the ion concentration separated from the insulating oil. Indicates magnification factor. and It is determined by the performance of the mass spectrometer itself.

[0080] Step 3: Solve for the membrane permeation efficiency parameters.

[0081] Membrane permeation efficiency under different influencing factors Represented as:

[0082] (3)

[0083] in, T The film surface temperature (unit: K ), Let be the function of the effect of temperature on membrane permeation efficiency. This represents the membrane permeation efficiency under standard conditions.

[0084] Under given flow rate and pressure conditions, the effect of temperature on membrane permeation efficiency is described by Arrhenius's law as follows:

[0085] (4)

[0086] in, RThe gas constant (value 8.314 cm⁻¹) 3 MPa / (mol·K)), The value is the osmotic activation energy (unit: kcal / mol).

[0087] Combining formulas (3) and (4), the quantitative relationship between membrane permeability and each influencing factor under different influencing conditions is obtained as follows:

[0088] (5)

[0089] The method for determining the membrane permeation efficiency under standard conditions is as follows: using insulating oil with seven characteristic dissolved gases at fixed concentrations as experimental samples, the detection signal intensity corresponding to samples of known concentrations is obtained, such as... Figure 7 As shown, the standard membrane permeation efficiency for different dissolved gases was obtained through fitting. In actual operating environments, the Reynolds number corresponding to the membrane surface flow velocity is greater than 3000, and the effect of the membrane surface flow velocity on the permeation efficiency can be ignored.

[0090] The osmotic activation energy The determination method is as follows: Temperatures are increased at equal intervals within the range of 10℃ to 70℃, and seven characteristic dissolved gases are input into the mass spectrometer under one atmosphere of pressure. Figure 8 As shown, the relationship between the peak heights and temperature of the mass spectra of seven characteristic dissolved gases was obtained, thereby fitting the permeation activation energy of each characteristic dissolved gas. .

[0091] Step 4: Determine the concentration of the characteristic gas by analyzing the signal intensity in the mass spectrometry spectrum.

[0092] Under conditions where temperature, gas type, and membrane specifications remain unchanged, the signal intensity (peak height) in the mass spectrometer is directly proportional to the concentration of the characteristic gas. Therefore, the quantitative relationship between the concentration of the characteristic gas and the signal intensity in the mass spectrometer is as follows:

[0093] (6)

[0094] Combining formulas (1), (2), (5), and (6), we get:

[0095] (7)

[0096] in, Membrane permeation efficiency under different influencing factors, Indicates the ion response parameters. This indicates the ratio of the ion concentration reaching the mass spectrometer to the ion concentration separated from the insulating oil. Let x be the relative ionization efficiency of gas x relative to argon. The signal intensity in the spectrum. Indicates the magnification factor.

[0097] Example 3

[0098] An apparatus includes a memory and a processor, the memory being used to store a program that enables the processor to execute the mass spectrometry detection method of Embodiment 2, the processor being configured to execute the program stored in the memory.

[0099] Example 4

[0100] A storage medium storing a computer program, which, when executed by a processor, performs the steps of the mass spectrometry detection method in Embodiment 2.

[0101] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An insulating oil dissolution gas film separation device, characterized in that, include: The components include an upper cover plate (10), a base plate (11), an annular sealing gasket (12), an oil-gas separation membrane (13), a metal support mesh (14), a capillary tube (15), a valve (16), a heating resistance wire (17), an oil inlet (18), an oil outlet (19), and an external oil sample heating device. The upper cover plate (10) is symmetrically provided with an oil inlet (18) and an oil outlet (19). The output port of the external oil sample heating device is sealed to the oil inlet (18). An annular sealing gasket (12) is provided between the upper cover plate (10) and the base plate (11). After the upper cover plate (10) and the base plate (11) are aligned and sealed, an oil channel is formed. A circular groove is opened on the top of the base plate (11). 11) The interior is uniformly embedded with a spiral heating resistance wire (17). The metal support mesh (14) is installed in a circular groove. The oil-gas separation membrane (13) is attached to the upper surface of the metal support mesh (14). A through hole is opened downward at the center of the circular groove opened at the top of the base plate (11). The input end of the capillary tube (15) is installed in the through hole and extends downward. The input end of the capillary tube (15) abuts against the lower surface of the metal support mesh (14). A valve (16) is installed on the capillary tube (15). The output end of the capillary tube (15) is sealed and connected to the mass spectrometer. The external oil sample heating device is used in conjunction with the heating resistance wire (17) to maintain a uniform temperature gradient on both sides of the oil-gas separation membrane (13).

2. The insulating oil dissolving gas film separation device according to claim 1, characterized in that, The external oil sample heating device includes: an insulating oil conveying pipe (20) and a constant temperature water bath heating device (21); the insulating oil conveying pipe (20) is in the form of multiple U-shaped pipes connected in series, the insulating oil conveying pipe (20) is installed in the constant temperature water bath heating device (21), the constant temperature water bath heating device (21) is filled with constant temperature hot water, the inlet of the insulating oil conveying pipe (20) is used to input insulating oil, and the outlet of the insulating oil conveying pipe (20) is sealed to the oil inlet hole (18).

3. The insulating oil dissolving gas film separation device according to claim 2, characterized in that, The inlet of the insulating oil conveying pipe (20) is located below the constant temperature water bath heating device (21), and the outlet of the insulating oil conveying pipe (20) is located above the constant temperature water bath heating device (21).

4. The insulating oil dissolving gas film separation device according to claim 1, characterized in that, The distance between the inner walls of the oil inlet (18) and the oil outlet (19) that are far apart from each other is equal to the diameter of the circular groove opened on the top of the base plate (11).

5. The insulating oil dissolving gas film separation device according to claim 1, characterized in that, The oil outlet (19) is connected to the peristaltic pump.

6. The insulating oil dissolving gas film separation device according to claim 1, characterized in that, It also includes thermocouples, which are disposed in the oil channel.

7. The insulating oil dissolving gas film separation device according to claim 1, characterized in that, The oil-gas separation membrane (13) is an AF2400 membrane.

8. The insulating oil dissolving gas film separation device according to claim 1, characterized in that, The heating resistance wire (17) is a nickel-chromium alloy heating resistance wire.

9. A mass spectrometry detection method based on the insulating oil dissolved gas film separation device according to any one of claims 1 to 8, characterized in that, include: S1. Based on the relationship between the flow rate and signal intensity of the characteristic dissolved gases, the ionization efficiency parameters are solved. The specific method is as follows: membrane injection and mass spectrometry are used to obtain the relationship between the flow rate and signal intensity of various characteristic dissolved gases. The experimental data of the flow rate and signal intensity of various characteristic dissolved gases are linearly fitted. Combined with the partial pressure information of the gas components and the slope information of the fitted line, the relative ionization efficiency of various characteristic dissolved gases is calculated. S2. Based on the relationship between dissolved oxygen concentration and signal intensity, the ion response parameters are solved. The specific method is as follows: the dissolved oxygen concentration of the insulating oil is changed by using pure nitrogen for headspace purging, and the dissolved oxygen concentration is simultaneously detected by a mass spectrometer. The relationship curve between dissolved oxygen concentration and signal intensity is obtained. The signal intensity of dissolved oxygen is extracted from the spectrum, and the relationship curve between dissolved oxygen concentration and signal intensity is plotted and linearly fitted to obtain the ion response coefficient. S3. Solve for the membrane permeation efficiency parameters. The specific method is as follows: calculate the membrane permeation efficiency under different influencing factors, and use the Arrhenius formula to describe the influence function of temperature on membrane permeation efficiency, thereby obtaining the quantitative relationship between the membrane permeation efficiency under different influencing factors and each influencing factor. S4. The concentration of the characteristic gas is determined by the signal intensity in the mass spectrometer. Specifically, under the condition that the temperature, gas type, and membrane specifications remain unchanged, the signal intensity in the mass spectrometer is directly proportional to the concentration of the characteristic gas, thus obtaining the quantitative relationship between the concentration of the characteristic gas and the signal intensity in the mass spectrometer.

10. The mass spectrometry detection method according to claim 9, characterized in that, The formulas for calculating the relative ionization efficiency of the various dissolved gases with different characteristics mentioned in step S1 are as follows: （1） in, The ionization efficiency of the characteristic dissolved gas x is given. The target ion concentration after the characteristic dissolved gas x is ionized. Characteristic dissolved gas x initial concentration, For argon ionization efficiency, The relative ionization efficiency of the characteristic dissolved gas x relative to argon is given.

11. The quantitative mass spectrometry detection method for dissolved gas in insulating oil according to claim 10, characterized in that, The formula for calculating the ion response coefficient in step S2 is as follows: （2） in, Indicates the ion response parameters. This indicates the membrane permeation efficiency under standard conditions. This indicates the ratio of the ion concentration reaching the mass spectrometer to the ion concentration separated from the insulating oil. Indicates the magnification factor.

12. The mass spectrometry detection method according to claim 11, characterized in that, The method described in step S3, which calculates the membrane permeation efficiency under different influencing factors and uses the Arrhenius formula to describe the effect function of temperature on membrane permeation efficiency, thereby obtaining the quantitative relationship between the membrane permeation efficiency and each influencing factor under different influencing factors, is as follows: Membrane permeation efficiency under different influencing factors Represented as: （3） Under given flow rate and pressure conditions, the effect of temperature on membrane permeation efficiency is described by the Arrhenius formula as follows: （4） Combining formulas (3) and (4), the quantitative relationship between membrane permeability and each influencing factor under different influencing conditions is obtained as follows: （5） in, T The temperature of the membrane surface. Let be the function of the effect of temperature on membrane permeation efficiency. The membrane permeation efficiency under standard conditions. R The gas constant is This is the osmotic activation energy.

13. The mass spectrometry detection method according to claim 12, characterized in that, The method for determining the membrane permeation efficiency under standard conditions is as follows: using insulating oil with different characteristic dissolved gases at fixed concentrations as experimental samples, obtaining the detection signal intensity corresponding to samples with known concentrations, and fitting the standard membrane permeation efficiency for different characteristic dissolved gases.

14. The mass spectrometry detection method according to claim 12, characterized in that, The method for determining the osmotic activation energy is as follows: Temperature is increased at equal intervals within a certain range. Under one atmosphere of pressure, the characteristic dissolved gas is input into a mass spectrometer. The relationship between the peak height of the mass spectrum of the characteristic dissolved gas and the temperature is obtained, thereby fitting the osmotic activation energy of each characteristic dissolved gas. .

15. The mass spectrometry detection method according to claim 12, characterized in that, The quantitative relationship between the characteristic gas concentration and the signal intensity in the mass spectrum in step S4 is as follows: （6） Combining formulas (1), (2), (5), and (6), we get: （7） in, Membrane permeation efficiency under different influencing factors, Indicates the ion response parameters. This indicates the ratio of the ion concentration reaching the mass spectrometer to the ion concentration separated from the insulating oil. Let x be the relative ionization efficiency of gas x relative to argon. The signal intensity in the spectrum. Indicates the magnification factor.

16. A device comprising a memory and a processor, characterized in that, The memory is used to store a program that supports the processor in executing the mass spectrometry detection method according to any one of claims 9 to 15, and the processor is configured to execute the program stored in the memory.

17. A storage medium storing a computer program, characterized in that, The computer program is executed by the processor to perform the steps of the mass spectrometry detection method according to any one of claims 9 to 15.

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