Comprehensive dehumidification system and method for SF6 insulation high-voltage experiment tank

Abstract

The invention discloses a comprehensive dehumidification system for an SF6 insulation high-voltage experiment tank, and relates to the technical field of high-voltage test equipment and gas insulation, and the device comprises an experiment tank, a vacuum pump set, a high-purity nitrogen source, a sulfur hexafluoride gas source, a dew-point instrument and a renewable drying device. A renewable drying device and an experimental tank body are deeply integrated, and gas in the tank is driven by a circulating fan to form a closed circulating flow path, so that the gas forcibly flows through an adsorption tank filled with an adsorbent for continuous moisture adsorption; when regeneration is needed, after the adsorption tank is isolated through the drying valve group, an adsorbent is heated and desorbed by utilizing a heater arranged on the adsorption tank, and meanwhile, the vacuum pump group is started and water vapor is rapidly pumped away through the vacuum interface valve group, so that a complete closed loop from adsorption to regeneration is realized, and the dryness in the tank can be continuously maintained through physical circulation; and the tedious operation of replacing the drying agent by opening the tank in the traditional scheme is fundamentally avoided.

Description

Technical Field

[0001] This invention relates to the field of high voltage testing equipment and gas insulation technology, and in particular to a comprehensive dehumidification system and method for SF6 insulated high voltage test tanks. Background Technology

[0002] In the field of high-voltage engineering, high-voltage training and insulation experiments at 2.5 MeV and above typically require creating and maintaining an extremely pure and dry insulating environment within a sealed, large experimental tank. Sulfur hexafluoride (SF6) gas is widely used as the insulating medium for such tanks due to its excellent dielectric strength and superior arc-quenching properties. However, the insulating properties of SF6 gas are extremely sensitive to its internal moisture content. Even trace amounts of moisture can significantly reduce the gas's insulating strength, easily leading to insulation breakdown under high electric fields and causing experimental failure. More seriously, under high-voltage discharge (such as corona discharge or arc discharge), moisture reacts chemically with the decomposition products of SF6, generating highly corrosive substances such as hydrogen fluoride and sulfuric acid. These substances not only corrode the inner wall of the tank and critical components such as high-voltage electrodes, shortening equipment lifespan, but also severely pollute the experimental environment, affecting the accuracy and reliability of experimental data. Therefore, dehumidification within the experimental tank is extremely important.

[0003] Currently, traditional dehumidification methods for SF6 insulation test tanks mainly rely on nitrogen purging or simple vacuuming before filling. These methods are effective for initially adhering moisture, but they are difficult to completely remove deeply adsorbed moisture on the tank walls, insulation components, and in hard-to-reach areas, resulting in limited initial dehumidification. Furthermore, the test tank is not absolutely sealed. During long-term operation, moisture from the external environment slowly but continuously seeps into the tank due to the humidity difference between the inside and outside, causing the internal moisture content to gradually increase. Once the moisture content exceeds the standard, the traditional approach is to recover and purify all the expensive SF6 gas, then open the tank and replace the disposable desiccant. This process is not only cumbersome, time-consuming, and labor-intensive, interrupting the experiment, but SF6 gas itself is expensive and has a strong greenhouse effect, incurring economic and environmental costs for recovery and filling. More importantly, opening the tank inevitably introduces new air pollutants and moisture, disrupting the established stable experimental environment and affecting the continuity and repeatability of the experiment. Therefore, existing technical solutions have significant shortcomings in terms of the thoroughness of initial dehumidification, the dynamic stability of humidity during long-term operation, and the economy and convenience of maintenance. Summary of the Invention

[0004] This invention provides a comprehensive dehumidification system and method for SF6 insulated high-voltage test tanks, which can solve the problems of obvious deficiencies in the existing technology in terms of the thoroughness of initial dehumidification, the dynamic stability of humidity during long-term operation, and the economy and convenience of maintenance.

[0005] A comprehensive dehumidification system for an SF6-insulated high-voltage test tank includes a test tank, a vacuum pump unit, a high-purity nitrogen source, a sulfur hexafluoride (SF6) gas source, a dew point meter, and a regenerative drying device. The vacuum pump unit is connected to the test tank via pipeline; the high-purity nitrogen source is connected to the test tank via pipeline; the SF6 gas source is connected to the test tank via pipeline; the dew point meter is installed on the test tank to monitor the moisture content of the gas inside the test tank; the regenerative drying device is connected to the test tank via pipeline to form a circulation path; the regenerative drying device includes at least one adsorption tank filled with adsorbent and a circulating fan for driving gas circulation. The inlet of the circulating fan is connected to the outlet of the test tank via pipeline, and the outlet of the circulating fan is connected to the inlet of the adsorption tank via pipeline. The outlet of the adsorption tank is connected to the inlet of the test tank via a drying valve group, and the inlet of the vacuum pump unit is connected to the adsorption tank via a vacuum interface valve group. A heater is installed on the adsorption tank.

[0006] The present invention provides a comprehensive dehumidification system for SF6 insulated high-voltage test tanks, which, compared with the prior art, has, but is not limited to, the following beneficial effects: This integrated dehumidification system for SF6 insulated high-voltage test tanks deeply integrates a regenerable drying device with the test tank. A circulating fan drives the gas inside the tank to form a closed-loop flow path, forcing the gas to continuously adsorb moisture through the adsorption tank filled with adsorbent. When regeneration is required, the adsorption tank is isolated by a drying valve assembly, and the adsorbent is heated and desorbed using its built-in heater. Simultaneously, a vacuum pump assembly is activated, and water vapor is quickly removed through a vacuum interface valve assembly. This achieves a complete closed loop from adsorption to regeneration, continuously maintaining the dryness inside the tank through physical circulation and regenerating the adsorbent in situ. This fundamentally avoids the cumbersome operation of opening the tank to replace the desiccant required in traditional solutions, significantly improving the continuity and economy of system operation.

[0007] Furthermore, a first control valve is installed on the pipeline between the vacuum pump unit and the experimental tank, a second control valve is installed on the pipeline between the high-purity nitrogen source and the experimental tank, and a fourth control valve is installed on the pipeline between the sulfur hexafluoride source and the experimental tank.

[0008] Furthermore, the sulfur hexafluoride gas source is connected to the adsorption tank via a pipeline, and a third control valve is installed on the pipeline between the sulfur hexafluoride gas source and the adsorption tank.

[0009] Furthermore, the regenerative drying device includes two adsorption tanks, namely a first adsorption tank and a second adsorption tank arranged in parallel. The gas outlets of the first adsorption tank and the second adsorption tank are respectively connected to the gas inlet of the experimental tank through pipelines. The gas inlet of the vacuum pump group is respectively connected to the first adsorption tank and the second adsorption tank through pipelines.

[0010] Furthermore, a first vacuum interface valve group is installed on the pipeline between the first adsorption tank and the vacuum pump group, a second vacuum interface valve group is installed on the pipeline between the second adsorption tank and the vacuum pump group, a first drying valve group is installed on the pipeline between the gas outlet end of the first adsorption tank and the gas inlet end of the experimental tank, and a second drying valve group is installed on the pipeline between the second adsorption tank and the gas inlet end of the experimental tank.

[0011] Furthermore, high-precision gas filters are installed on the outlet pipelines of both the high-purity nitrogen source and the sulfur hexafluoride source.

[0012] Furthermore, a heating jacket is provided on the outside of the experimental tank.

[0013] A comprehensive dehumidification method for an SF6-insulated high-voltage test tank includes the following steps: S1. Close the drying valve group, open the first control valve, start the vacuum pump group to evacuate the test tank, and simultaneously heat the test tank through the heating jacket until the dew point inside the tank reaches a first predetermined threshold; S2. Close the first control valve, open the second control valve, fill the test tank with high-purity nitrogen to atmospheric pressure, close the second control valve, and open the first control valve again to evacuate the tank. This process can be repeated; S3. Close the first control valve, open the fourth control valve, and fill the test tank with sulfur hexafluoride gas to the test pressure; S4. Open the drying valve group, start the circulating fan, and allow the sulfur hexafluoride gas in the test tank to circulate through the adsorption tank, where the adsorbent continuously adsorbs moisture; S5. When regeneration is required, close the drying valve group to isolate the adsorption tank, turn on the heater to heat the adsorption tank, and simultaneously open the vacuum interface valve group and start the vacuum pump group to evacuate the tank. After desorption of moisture, stop heating and cool down to complete regeneration.

[0014] Furthermore, in step S5, the regeneration operation is triggered when the dew point value monitored by the dew point meter reaches a second predetermined threshold, or when it is automatically executed according to a preset time period.

[0015] Furthermore, when using a system that includes a first adsorption tank and a second adsorption tank, the first adsorption tank and the second adsorption tank are controlled to alternate between adsorption mode and regeneration mode to achieve uninterrupted dehumidification. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the integrated dehumidification system for an SF6-insulated high-voltage test tank according to an embodiment of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the integrated dehumidification system for an SF6-insulated high-voltage test tank according to an embodiment of the present invention. Figure 2 ; Figure 3 This is a schematic diagram of the integrated dehumidification system for an SF6 insulated high-voltage test tank according to another embodiment of the present invention.

[0017] Explanation of reference numerals in the attached figures: 1. Experimental tank; 2. Vacuum pump assembly; 3. High-purity nitrogen source; 4. Sulfur hexafluoride gas source; 5. Dew point meter; 6. Regenerative drying device; 7. Vacuum interface valve assembly; 7a. First vacuum interface valve assembly; 7b. Second vacuum interface valve assembly; 8. High-precision gas filter; 9. Heating jacket; 10. First control valve; 11. Second control valve; 12. Third control valve; 13. Fourth control valve; 61. Adsorption tank; 61a. First adsorption tank; 61b. Second adsorption tank; 62. Circulating fan; 63. Adsorbent; 64. Heater; 65. Drying valve assembly; 65a. First drying valve assembly; 65b. Second drying valve assembly. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings showing multiple embodiments according to this application. It should be understood that the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments described in this application without creative effort will fall within the scope of protection of this application.

[0019] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing specific embodiments only and is not intended to limit this application; the terms "comprising," "including," "having," "containing," etc., in the description, claims, and accompanying drawings of this application are open-ended terms. Therefore, "comprising," "including," or "having" refers to, for example, a method or apparatus having one or more steps or elements, but is not limited to having only these one or more elements. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy. Furthermore, 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. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0020] In the description of this invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0021] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0022] It should be emphasized that when the term "comprising / including" is used in this specification, it is used to explicitly indicate the presence of the stated feature, integer, step, or component, but does not exclude the presence or addition of one or more other features, integers, steps, parts, or groups of features, integers, steps, or parts.

[0023] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0024] Example 1: like Figure 1-2 As shown in the figure, an embodiment of the present invention provides a comprehensive dehumidification system for an SF6-insulated high-voltage test tank, comprising a test tank 1, a vacuum pump assembly 2, a high-purity nitrogen source 3, a sulfur hexafluoride gas source 4, a dew point meter 5, and a regenerative drying device 6. The vacuum pump assembly 2 is connected to the test tank 1 via a pipeline; the high-purity nitrogen source 3 is connected to the test tank 1 via a pipeline; the sulfur hexafluoride gas source 4 is connected to the test tank 1 via a pipeline; the dew point meter 5 is installed on the test tank 1 to monitor the moisture content of the gas inside the test tank 1; and the regenerative drying device 6... The pipeline is connected to the experimental tank 1 to form a circulation path; the regenerable drying device 6 includes at least one adsorption tank 61 filled with adsorbent 63 and a circulating fan 62 that drives gas circulation. The inlet of the circulating fan 62 is connected to the outlet of the experimental tank 1 through a pipeline, and the outlet of the circulating fan 62 is connected to the inlet of the adsorption tank 61 through a pipeline. The outlet of the adsorption tank 61 is connected to the inlet of the experimental tank 1 through a drying valve group 65. The inlet of the vacuum pump group 2 is connected to the adsorption tank 61 through a vacuum interface valve group 7. A heater 64 is provided on the adsorption tank 61.

[0025] In this embodiment, by deeply integrating the regenerable drying device 6 with the experimental tank 1, the gas inside the tank is driven by the circulating fan 62 to form a closed circulation flow path, so that the gas is forced to flow through the adsorption tank 61 filled with adsorbent 63 for continuous moisture adsorption. When regeneration is required, the adsorption tank is isolated by the drying valve group 65, and the adsorbent is heated and desorbed by the heater 64 configured thereon. At the same time, the vacuum pump group 2 is turned on and the water vapor is quickly extracted through the vacuum interface valve group 7, realizing a complete closed loop from adsorption to regeneration. It can not only maintain the dryness inside the tank through physical circulation, but also regenerate the adsorbent in situ, fundamentally avoiding the cumbersome operation of opening the tank to replace the desiccant in the traditional solution, and significantly improving the continuity and economy of system operation.

[0026] Specifically, the experimental tank 1 serves as the core bearing space for the high-pressure experiment. It is connected via pipelines to a vacuum pump group 2, a high-purity nitrogen source 3, and a sulfur hexafluoride gas source 4, forming a basic flow path of vacuuming, gas replacement, and insulating gas filling. A dew point meter 5 mounted on the tank monitors the internal moisture content in real time, allowing for precise control of humidity levels at each stage of dehumidification. Simultaneously, a regenerable drying device 6 is connected to the experimental tank 1 via pipelines, forming a closed-loop circulation path. Its adsorption tank 61 and circulating fan 62 form a dynamic dehumidification unit driven by gas and adsorbing moisture. The inlet of the circulating fan 62 is connected to the air inlet of the adsorption tank 61, and the outlet is connected to the air outlet of the experimental tank 1. The air outlet of the adsorption tank 61 is then connected to the air inlet of the experimental tank 1 via a drying valve group 65, ensuring that the SF6 gas inside the experimental tank 1 is forcibly driven to flow through the adsorption tank 61, where the adsorbent 63 efficiently captures moisture. Furthermore, the drying valve group 65 can flexibly control the opening and closing of the circulation path, facilitating subsequent adsorption tank regeneration operations. Vacuum pump unit 2 is connected to adsorption tank 61 via vacuum interface valve group 7. Adsorption tank 61 is also equipped with heater 64. The two work together to isolate adsorption tank 61 from experimental tank 1 when adsorbent 63 is saturated. Heater 64 heats and desorbs moisture, while vacuum pump unit 2 removes water vapor, achieving in-situ regeneration of adsorbent. In the overall system structure, the pipeline connection between vacuum pump unit 2 and experimental tank 1 ensures initial high-vacuum dehumidification. The cooperation between drying valve group 65 and adsorption tank 61 enables dynamic dehumidification and regeneration switching. This ensures that the initial dehumidification stage can be achieved by vacuuming with vacuum pump unit 2 and replacing the background moisture in experimental tank 1 with high-purity nitrogen source 3. At the same time, it can maintain low humidity throughout the experimental cycle through the circulation path of regenerable drying device 6. Meanwhile, vacuum interface valve group 7 and heater 64 avoid opening the tank for maintenance, significantly improving the thoroughness, continuity and ease of operation of system dehumidification, and effectively meeting the requirements of high-pressure experiments for an ultra-dry and insulating environment.

[0027] Among them, the gas extracted by vacuum pump unit 2 is discharged into the recycling tank for recycling.

[0028] like Figure 1 and Figure 2 As shown, a first control valve 10 is installed on the pipeline between the vacuum pump unit 2 and the experimental tank 1, a second control valve 11 is installed on the pipeline between the high-purity nitrogen source 3 and the experimental tank 1, and a fourth control valve 13 is installed on the pipeline between the sulfur hexafluoride source 4 and the experimental tank 1.

[0029] In this embodiment, the first control valve 10 enables independent and precise control of the tank vacuuming process; the second control valve 11, installed at the inlet of the high-purity nitrogen source 3, ensures the management of the gas supply during the nitrogen replacement stage; and the fourth control valve 13, installed on the sulfur hexafluoride gas source 4 pipeline, ensures the controllable operation of the insulating gas filling process. This multi-valve group collaborative layout allows the system to execute the strict process flow of vacuuming, gas replacement, and insulating gas filling in sequence, with each stage operating independently. This avoids cross-contamination of gases and effectively reduces the mutual influence between different gas source pipelines through valve isolation, significantly improving the accuracy and reliability of system operation.

[0030] like Figure 1 and Figure 2 As shown, the sulfur hexafluoride gas source 4 is connected to the adsorption tank 61 through a pipeline, and a third control valve 12 is installed on the pipeline between the sulfur hexafluoride gas source 4 and the adsorption tank 61.

[0031] In this embodiment, by setting up a dedicated pipeline connecting the sulfur hexafluoride gas source 4 and the adsorption tank 61 and a third control valve 12, a small amount of dry sulfur hexafluoride gas can be directly introduced into the tank after the adsorption tank has completed regeneration, so that its pressure is quickly balanced with the main experimental tank 1. This not only avoids the adsorbent from coming into contact with the outside air during the switching process, but also ensures that the system always maintains a pure sulfur hexafluoride insulating environment, significantly reducing the loss and pollution risk during the gas replacement process.

[0032] like Figure 1 and Figure 2 As shown, high-precision gas filters 8 are installed on the outlet pipes of high-purity nitrogen source 3 and sulfur hexafluoride source 4, and a heating jacket 9 is installed on the outside of the experimental tank 1.

[0033] In this embodiment, high-precision gas filters 8 are installed on the outlet pipelines of high-purity nitrogen source 3 and sulfur hexafluoride source 4, respectively, which can effectively filter out trace amounts of moisture and particulate impurities that may be contained in the gas source, ensuring the purity of the gas entering the experimental tank 1 from the source. At the same time, the heating jacket 9 wrapped around the outer wall of the experimental tank 1 can uniformly heat the tank during the initial dehumidification stage, significantly improving the desorption efficiency of moisture adsorbed on the inner wall. These two measures work together to provide a solid foundation for establishing and maintaining an ultra-low humidity insulating experimental environment.

[0034] A comprehensive dehumidification method for an SF6 insulated high-voltage test tank includes the following steps: S1, closing the drying valve group 65, opening the first control valve 10, starting the vacuum pump group 2 to evacuate the test tank 1, and simultaneously heating the test tank 1 through the heating jacket 9 until the dew point inside the tank reaches a first predetermined threshold; S2, closing the first control valve 10, opening the second control valve 11, filling the test tank 1 with high-purity nitrogen to atmospheric pressure, closing the second control valve 11, and opening the first control valve 10 again to evacuate the tank; this process can be repeated; S3, closing... First control valve 10 is opened, and fourth control valve 13 is opened to fill the experimental tank 1 with sulfur hexafluoride gas to the experimental pressure; S4, the drying valve group 65 is opened and the circulating fan 62 is started to make the sulfur hexafluoride gas in the experimental tank 1 circulate through the adsorption tank 61, where the adsorbent 63 continuously adsorbs moisture; S5, when regeneration is required, the drying valve group 65 is closed to isolate the adsorption tank 61, the heater 64 is turned on to heat the adsorption tank 61, and at the same time, the vacuum interface valve group 7 is opened and the vacuum pump group 2 is started to evacuate the vacuum. After desorption of moisture, heating is stopped and cooling is performed to complete regeneration.

[0035] In this embodiment, by closing the drying valve group 65 to avoid airflow interference, and opening the first control valve 10 to enable the vacuum pump group 2 to precisely evacuate the experimental tank 1, while the heating jacket 9 heats the experimental tank 1, the dual action promotes the desorption and extraction of deep moisture inside the tank until the dew point meter 5 detects that the first predetermined threshold has been reached, ensuring that the initial background moisture is completely removed; by closing the first control valve 10 and opening the second control valve 11, the high-purity nitrogen source 3 is used to fill the experimental tank 1 with nitrogen, and then the second control valve 11 is closed and the first control valve 10 is opened to evacuate the tank. Repeating this operation can further replace residual moisture and air, preventing impurities from affecting the subsequent SF6 insulation performance; By closing the first control valve 10 and opening the fourth control valve 13, the sulfur hexafluoride gas source 4 is used to fill the experimental tank 1 with gas to the experimental pressure, precisely controlling the amount and pressure of insulating gas. By opening the drying valve group 65 and starting the circulating fan 62, the SF6 gas in the experimental tank 1 is driven to circulate through the adsorption tank 61, where the adsorbent 63 continuously adsorbs moisture, achieving dynamic humidity maintenance during the experiment. By closing the drying valve group 65 to isolate the adsorption tank 61, turning on the heater 64 to heat the adsorption tank 61, opening the vacuum interface valve group 7 and starting the vacuum pump group 2 to evacuate the system, the adsorbent 63 is desorbed and then cooled to complete regeneration, restoring its adsorption capacity without opening the tank. This forms a complete dehumidification-regeneration closed-loop control, thereby ensuring the purity of the insulating gas while achieving long-term self-sustaining operation of the system.

[0036] Furthermore, in step S5, the regeneration operation is triggered when the dew point value monitored by the dew point meter 5 reaches a second predetermined threshold, or automatically executed according to a preset time cycle. Through real-time monitoring by the dew point meter 5 and dual-path control via a preset cycle, intelligent operation management is achieved. When the dew point meter 5 monitors the value to the second predetermined threshold, regeneration is immediately initiated to ensure the accuracy of humidity control. Simultaneously, the preset time cycle serves as a safeguard, effectively addressing potential malfunctions or monitoring blind spots in the dew point meter 5. This achieves energy-saving operation with on-demand regeneration while ensuring the system's reliability during long-term operation, effectively preventing a decrease in dehumidification capacity due to adsorbent saturation.

[0037] Furthermore, when using a system including a first adsorption tank 61a and a second adsorption tank 61b, the first adsorption tank 61a and the second adsorption tank 61b are controlled to alternate between adsorption mode and regeneration mode to achieve uninterrupted dehumidification. By adopting a dual-tower structure with the first adsorption tank 61a and the second adsorption tank 61b arranged in parallel, and with an independent valve control system, truly uninterrupted dehumidification operation is achieved: when the first adsorption tank 61a is in adsorption mode to dehumidify the gas in the experimental tank 1, the second adsorption tank 61b can be heated and regenerated simultaneously; the automatic control system precisely switches the working state of the two adsorption tanks to ensure that one adsorption tank is always in working state, completely eliminating the dehumidification window period during regeneration in traditional single-tower systems, providing a continuous and stable ultra-low humidity environment for high-pressure experiments, and significantly improving the reliability of the system and the accuracy of experimental data.

[0038] Example 2: like Figure 3 As shown, the regenerative drying device 6 includes two adsorption tanks 61, namely a first adsorption tank 61a and a second adsorption tank 61b arranged in parallel. The outlet of the first adsorption tank 61a and the outlet of the second adsorption tank 61b are respectively connected to the inlet of the experimental tank 1 through pipelines. The inlet of the vacuum pump group 2 is connected to the first adsorption tank 61a and the second adsorption tank 61b through pipelines. The inlet of the first adsorption tank 61a and the second adsorption tank 61b are both connected to the outlet of the experimental tank 1 through a circulating fan 62.

[0039] In this embodiment, by connecting the first adsorption tank 61a and the second adsorption tank 61b in parallel to the system, when the first adsorption tank 61a is in adsorption mode, the second adsorption tank 61b can be regenerated independently. The vacuum pump group 2 is used to evacuate and desorb moisture from the second adsorption tank. The two towers are automatically controlled to operate alternately, thereby achieving truly uninterrupted and continuous dehumidification. This completely solves the technical problem of dehumidification interruption during regeneration in a single-tower structure and significantly improves the stability and reliability of the system.

[0040] like Figure 3As shown, a first vacuum interface valve group 7a is installed on the pipeline between the first adsorption tank 61a and the vacuum pump group 2, a second vacuum interface valve group 7b is installed on the pipeline between the second adsorption tank 61b and the vacuum pump group 2, a first drying valve group 65a is installed on the pipeline between the outlet end of the first adsorption tank 61a and the inlet end of the experimental tank 1, and a second drying valve group 65b is installed on the pipeline between the second adsorption tank 61b and the inlet end of the experimental tank 1.

[0041] In this embodiment, by setting a first vacuum interface valve group 7a and a second vacuum interface valve group 7b in the parallel dual-tower structure, the connection between the vacuum pump group 2 and the first adsorption tank 61a and the second adsorption tank 61b is independently controlled respectively. With the independent control of the gas outlet of each adsorption tank by the first drying valve group 65a and the second drying valve group 65b, the complete isolation operation of the dual towers is realized. This allows the other adsorption tank to continue to perform dehumidification while one adsorption tank is undergoing heating and vacuuming regeneration, ensuring the continuous and uninterrupted dehumidification process. At the same time, it effectively prevents the reverse diffusion of water vapor during the regeneration process, greatly improving the stability and reliability of the system operation.

[0042] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A comprehensive dehumidification system for SF6 insulated high-voltage test tanks, characterized in that: Experimental tank (1); The vacuum pump assembly (2) is connected to the experimental tank (1) via a pipeline; A high-purity nitrogen source (3) is connected to the experimental tank (1) via a pipeline; A sulfur hexafluoride gas source (4) is connected to the experimental tank (1) via a pipeline; A dew point meter (5) is installed on the experimental tank (1) to monitor the moisture content of the gas inside the experimental tank (1); The regenerative drying device (6) is connected to the experimental tank (1) through a pipeline to form a circulation path; The regenerative drying device (6) includes at least one adsorption tank (61) filled with adsorbent (63) and a circulating fan (62) for driving gas circulation. The inlet of the circulating fan (62) is connected to the outlet of the experimental tank (1) through a pipeline, and the outlet of the circulating fan (62) is connected to the inlet of the adsorption tank (61) through a pipeline. The outlet of the adsorption tank (61) is connected to the inlet of the experimental tank (1) through a drying valve group (65). The inlet of the vacuum pump group (2) is connected to the adsorption tank (61) through a vacuum interface valve group (7). A heater (64) is provided on the adsorption tank (61).

2. The integrated dehumidification system for SF6 insulated high-voltage test tanks as described in claim 1, characterized in that, A first control valve (10) is installed on the pipeline between the vacuum pump group (2) and the experimental tank (1), a second control valve (11) is installed on the pipeline between the high-purity nitrogen source (3) and the experimental tank (1), and a fourth control valve (13) is installed on the pipeline between the sulfur hexafluoride source (4) and the experimental tank (1).

3. The integrated dehumidification system for SF6 insulated high-voltage test tanks as described in claim 1, characterized in that, The sulfur hexafluoride gas source (4) is connected to the adsorption tank (61) through a pipeline, and a third control valve (12) is provided on the pipeline between the sulfur hexafluoride gas source (4) and the adsorption tank (61).

4. The integrated dehumidification system for SF6 insulated high-voltage test tanks as described in claim 1, characterized in that, The regenerative drying device (6) includes two adsorption tanks (61), which are a first adsorption tank (61a) and a second adsorption tank (61b) connected in parallel. The gas outlet of the first adsorption tank (61a) and the gas outlet of the second adsorption tank (61b) are respectively connected to the gas inlet of the experimental tank body (1) through pipelines. The gas inlet of the vacuum pump group (2) is respectively connected to the first adsorption tank (61a) and the second adsorption tank (61b) through pipelines.

5. The integrated dehumidification system for SF6 insulated high-voltage test tanks as described in claim 4, characterized in that, A first vacuum interface valve group (7a) is provided on the pipeline between the first adsorption tank (61a) and the vacuum pump group (2), a second vacuum interface valve group (7b) is provided on the pipeline between the second adsorption tank (61b) and the vacuum pump group (2), a first drying valve group (65a) is provided on the pipeline between the outlet end of the first adsorption tank (61a) and the inlet end of the experimental tank (1), and a second drying valve group (65b) is provided on the pipeline between the inlet end of the second adsorption tank (61b) and the inlet end of the experimental tank (1).

6. The integrated dehumidification system for SF6 insulated high-voltage test tanks as described in claim 1, characterized in that, High-precision gas filters (8) are installed on the outlet pipelines of both the high-purity nitrogen source (3) and the sulfur hexafluoride source (4).

7. The integrated dehumidification system for SF6 insulated high-voltage test tanks as described in claim 1, characterized in that, The experimental tank (1) is equipped with a heating jacket (9) on the outside.

8. A comprehensive dehumidification method for SF6 insulated high-voltage test tanks, characterized in that, The method is applied to the integrated dehumidification system for SF6 insulated high-voltage test tanks as described in any one of claims 1-7, and includes the following steps: S1. Close the drying valve group (65), open the first control valve (10), start the vacuum pump group (2) to evacuate the experimental tank (1), and at the same time heat the experimental tank (1) through the heating jacket (9) until the dew point inside the tank reaches the first predetermined threshold. S2. Close the first control valve (10), open the second control valve (11), fill the experimental tank (1) with high-purity nitrogen to atmospheric pressure, close the second control valve (11), and open the first control valve (10) again to evacuate. This process can be repeated. S3. Close the first control valve (10), open the fourth control valve (13), and fill the experimental tank (1) with sulfur hexafluoride gas to the experimental pressure; S4. Open the drying valve group (65) and start the circulating fan (62) to make the sulfur hexafluoride gas in the experimental tank (1) circulate through the adsorption tank (61) and the adsorbent (63) continuously adsorbs the moisture. S5. When regeneration is required, close the drying valve group (65) to isolate the adsorption tank (61), turn on the heater (64) and heat the adsorption tank (61), and at the same time open the vacuum interface valve group (7) and start the vacuum pump group (2) to evacuate the vacuum. After desorbing the moisture, stop heating and cool down to complete the regeneration.

9. The comprehensive dehumidification method for SF6 insulated high-voltage test tanks as described in claim 8, characterized in that, In step S5, the regeneration operation is triggered when the dew point value monitored by the dew point meter (5) reaches the second predetermined threshold, or when it is automatically executed according to a preset time period.

10. The comprehensive dehumidification method for SF6 insulated high-voltage test tanks as described in claim 8, characterized in that, When using a system including a first adsorption tank (61a) and a second adsorption tank (61b), the first adsorption tank (61a) and the second adsorption tank (61b) are controlled to alternate between adsorption mode and regeneration mode to achieve uninterrupted dehumidification.

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