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WO2022205503A1 - Système d'absorption d'humidité d'un appareil rempli d'huile et procédé de commande de fonctionnement d'un système d'absorption d'humidité - Google Patents

Système d'absorption d'humidité d'un appareil rempli d'huile et procédé de commande de fonctionnement d'un système d'absorption d'humidité Download PDF

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Publication number
WO2022205503A1
WO2022205503A1 PCT/CN2021/086864 CN2021086864W WO2022205503A1 WO 2022205503 A1 WO2022205503 A1 WO 2022205503A1 CN 2021086864 W CN2021086864 W CN 2021086864W WO 2022205503 A1 WO2022205503 A1 WO 2022205503A1
Authority
WO
WIPO (PCT)
Prior art keywords
moisture
silica gel
oil
solenoid valve
moisture absorber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2021/086864
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English (en)
Chinese (zh)
Inventor
陈文联
黎贤钛
郑尚尧
王建光
谢栋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang ERG Technology Inc
Original Assignee
Zhejiang ERG Technology Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zhejiang ERG Technology Inc filed Critical Zhejiang ERG Technology Inc
Publication of WO2022205503A1 publication Critical patent/WO2022205503A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26—Drying gases or vapours
    • B01D53/261—Drying gases or vapours by adsorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/26—Drying gases or vapours
    • B01D53/28—Selection of materials for use as drying agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
    • B01D2253/10—Inorganic adsorbents
    • B01D2253/106—Silica or silicates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/80—Water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2259/00—Type of treatment
    • B01D2259/40—Further details for adsorption processes and devices
    • B01D2259/40083—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption
    • B01D2259/40088—Regeneration of adsorbents in processes other than pressure or temperature swing adsorption by heating

Definitions

  • the present application relates to a moisture-proof technology for oil-filled equipment, in particular to a moisture-absorbing system for oil-filled equipment such as transformers and reactors, and a method for controlling the operation of the moisture-absorbing system.
  • Oil-filled equipment especially oil-filled electrical equipment, must be equipped with a moisture absorber.
  • Most of the existing moisture absorbers rely on observing the discoloration of the discolored silica gel, humidity detection, and determining the regeneration time or replacement time of the silica gel by combining the humidity value with an algorithm. There is no specific quantification of the moisture absorption degree of the silica gel. Or the silica gel has failed but the silica gel has not been treated, resulting in waste or moisture absorption of oil products, resulting in deterioration of insulation.
  • an electric heater is usually used for the regeneration and heating of the silica gel in the moisture absorber, which relies on thermal radiation to transfer heat during heating.
  • the existing moisture absorber usually uses transformer oil to isolate the connection between the moisture absorber and the outside air when there is no breathing action, and the effect of isolating the air is good. It may also contaminate the silicone, rendering it ineffective.
  • the present application provides a moisture absorption system for oil-filled equipment.
  • the moisture absorption system of the oil-filled equipment of the present application it is possible to avoid the situation that the silica gel has been treated when it still has a moisture-absorbing effect, or the silica gel has failed but the silica gel has not been treated, and the oil-filled equipment of the present application is maintenance-free and clean.
  • the present application also provides an operation control method for the moisture absorption system of the oil-filled equipment.
  • the moisture absorption system adopts the operation control method, which can avoid the occurrence of the silica gel has been processed when the moisture absorption effect is still present, or the silica gel has failed but the silica gel has not been treated. deal with the situation, and make the equipment operate with high reliability.
  • the moisture absorption system of the oil-filled equipment includes a main moisture absorber and an auxiliary moisture absorber; the tops of the main moisture absorber and the auxiliary moisture absorber are respectively connected with the first outlet and the second outlet of the two-position three-way solenoid valve through pipelines, The inlet of the two-position three-way solenoid valve is communicated with the breathing port on the oil pillow of the oil-filled equipment through the pipeline; the bottoms of the main moisture absorber and the auxiliary moisture absorber are respectively communicated with the top air port of a moisture isolation valve through the pipeline.
  • the interior of the moisture barrier valve is provided with an inspiratory flow channel and an expiratory flow channel, and both ends of the inspiratory flow channel and the expiratory flow channel are respectively communicated with the top vent and the bottom vent of the moisture barrier; so
  • the inhalation flow channel is provided with an upwardly open inhalation conduction check valve.
  • the inhalation conduction check valve is opened;
  • the exhalation flow channel is provided with a downwardly open one-way valve.
  • the exhalation conduction one-way valve is opened when the oil-filled device exhales.
  • the tops of the main moisture absorber and the auxiliary moisture absorber are respectively connected with the first outlet and the second outlet of the two-position three-way solenoid valve through the pipeline, and the inlet of the two-position three-way solenoid valve is connected with the charging port through the pipeline.
  • the breathing port on the oil pillow of the oil equipment is connected, and the three-way solenoid valve can be energized when processing the moisture absorbing material in the main moisture absorber, and the system can be switched to the auxiliary moisture absorber.
  • the moisture absorber works, so that the three-way solenoid valve is in a power-off state for most of the time, it is not easy to fail, and the reliability is high;
  • the moisture isolation valve is closed to isolate the communication between the inside of the moisture absorber and the outside air, so as to prevent the outside air from entering the moisture absorber and making the moisture-absorbing material damp. It enters the dehumidifier through the inhalation flow channel, and enters the oil pillow after drying.
  • the exhalation conduction check valve is opened, and the gas is discharged to the outside through the exhalation flow channel.
  • the moisture isolation valve replaces the traditional transformer oil to seal and isolate the outside world. It not only has a good air isolation effect, but also has no oil stains on the surface of the moisture absorber, which is clean and environmentally friendly.
  • the main moisture absorber includes a vertically arranged cylindrical shell; a moisture absorption box is arranged inside the cylindrical shell, and the moisture absorption box is densely provided with ventilation holes, so The moisture absorption box is provided with color-changing silica gel and a temperature sensor for detecting the temperature of the color-changing silica gel; correspondingly, the interior of the cylindrical shell is also provided with a magnetron microwave heating device for heating the color-changing silica gel and a magnetron microwave heating device for heating the color-changing silica gel.
  • the top and bottom of the cylindrical shell are respectively provided with a first solenoid valve and a second solenoid valve; the structure of the auxiliary moisture absorber is the same as that of the main moisture absorber. Therefore, when the moisture absorber is working, when the weighing sensor detects that the water absorption of the silica gel in the moisture absorber reaches a certain set value, the silica gel can be heated by the magnetron microwave heating device, and the temperature of the silica gel can be detected by the temperature sensor. The temperature of the silica gel is controlled within the set range, so that the silica gel is dehydrated and regenerated.
  • the first solenoid valve and the second solenoid valve are in the open state, the generated water vapor is discharged through the first solenoid valve, and the condensed water generated passes through the second solenoid valve.
  • the solenoid valve is discharged.
  • the color-changing silica gel regeneration is completed, the magnetron microwave heating device stops heating, and the first solenoid valve and the second solenoid valve are closed.
  • the silica gel regeneration is completed, and the regeneration process is only It takes dozens of minutes to complete.
  • the moisture absorption box, the magnetron microwave heating device and the load cell are arranged in sequence from top to bottom, and the moisture absorption box and the magnetron microwave heating device exist circumferentially. Constrained, vertically movable in the gap with the top, the load cell is free to bear the weight of the magnetron microwave heating device and the hygroscopic box equipped with color-changing silica gel and temperature probe in the vertical direction.
  • the material of the moisture absorption box may be plastic.
  • the load cell may be a high temperature type bellows fully sealed load cell.
  • an insulating layer is provided between the magnetron microwave heating device and the load cell.
  • the first solenoid valve is connected to the elbow to form an outlet facing downward; the outlet of the second solenoid valve faces downward.
  • the first solenoid valve is connected to the elbow outlet to prevent dust, moisture, etc. from accumulating at the outlet, and the second solenoid valve outlet faces downwards to facilitate drainage.
  • the aforementioned operation control method of the moisture absorption system of the oil-filled equipment of the present application is: under normal circumstances, the two-position three-way solenoid valve is powered off, the main moisture absorber works, and the auxiliary moisture absorber does not work; When the water absorption of the color-changing silica gel reaches the first set threshold, the two-position three-way solenoid valve, the magnetron microwave heating device, the first solenoid valve, and the second solenoid valve are energized at the same time, the main moisture absorber stops working, and the auxiliary moisture absorber starts.
  • the magnetron microwave heating device heats the discolored silica gel in the main moisture absorber, and controls the heating temperature to 100-120 °C, the water vapor produced is discharged through the first solenoid valve, and the condensed water produced is discharged through the solenoid valve at the bottom.
  • the magnetron microwave heating device, the first solenoid valve and the second solenoid valve lose power at the same time, and the magnetron microwave heating device stops heating, The first solenoid valve and the second solenoid valve are closed, and the regeneration of the discolored silica gel ends.
  • the residual water vapor after the silica gel regeneration is absorbed by the silica gel.
  • the two-position three-way solenoid valve is powered off and switches to the main moisture absorber work; during the regeneration of the discolored silica gel in the main moisture absorber, if the water absorption of the discolored silica gel in the auxiliary moisture absorber reaches the first set threshold, after the regeneration of the discolored silica gel in the main moisture absorber is completed, it is switched back to the main moisture absorber to work. Regenerate the discolored silica gel in the auxiliary moisture absorber in the same way.
  • the moisture absorption system operates in the above method.
  • the two-position three-way solenoid valve is not energized under normal circumstances. It is only energized during the regeneration of the silica gel in the main moisture absorber and during the delay period after regeneration. It is not easy to damage, has high reliability and has a long service life. Long, control the heating temperature of silica gel regeneration to 100-120 °C, which will not damage the silica gel, and the regeneration time is short, which can be completed in tens of minutes. After the silica gel regeneration in the main moisture absorber is completed, delay for a set time and then switch back The main moisture absorber works to prevent the residual water vapor from entering the oil pillow after the main moisture absorber completes the discoloration silica gel regeneration.
  • the first set threshold may be 26% of the weight of the color-changing silica gel
  • the second set threshold may be 26% of the weight of the color-changing silica gel.
  • the set time does not exceed 30 minutes.
  • the specific structure makes the moisture absorption system maintenance-free and highly reliable during operation
  • the traditional transformer oil is sealed and isolated from the outside by setting a moisture-proof valve with a specific structure, which can effectively ensure the tightness, clean and environmental protection, and completely prevent the possible failure of silica gel pollution;
  • the magnetron microwave heating device is used to replace the traditional electric heating device. During heating, the high-frequency reciprocating motion of the water molecules inside the silica gel generates "internal friction heat" to increase the temperature of the silica gel.
  • the silica gel regeneration time is from 8-10 The hour is shortened to dozens of minutes, which greatly reduces the power consumption and prevents the rapid aging of the internal materials of the dehumidifier;
  • the specific operation control method provides a guarantee for the reliable operation of the moisture absorption system.
  • Fig. 1 is the structural schematic diagram of the moisture absorption system of the oil-filled equipment of the application
  • FIG. 2 is a schematic structural diagram of the moisture barrier valve in the application (closed state);
  • FIG. 3 is a schematic diagram of the structure of the moisture barrier valve in the present application (inhalation state);
  • FIG. 4 is a schematic diagram of the structure of the moisture barrier valve in the present application (exhalation state).
  • moisture absorber refers to either the main moisture absorber or the auxiliary moisture absorber.
  • the first outlet of the two-position, three-way solenoid valve 3 refers to the outlet that is opened when the power is turned off
  • the second outlet of the two-position, three-way solenoid valve 3 refers to the outlet that is opened when the power is turned on.
  • the moisture absorption system of the oil-filled device includes a main moisture absorber 1 and an auxiliary moisture absorber 2; the tops of the main moisture absorber 1 and the auxiliary moisture absorber 2 are connected to two The first outlet and the second outlet of the three-way solenoid valve 3 are connected, and the inlet of the two-position three-way solenoid valve 3 is connected to the breathing port on the oil pillow 5 of the oil-filled equipment through a pipeline; the main moisture absorber The bottoms of 1 and the auxiliary moisture absorber 2 are respectively communicated with the top vent of a moisture isolation valve 4 through pipelines; The two ends of the flow channel 401 and the expiratory flow channel 402 are respectively communicated with the top air port and the bottom air port of the moisture barrier valve 4; the inhalation flow channel 401 is provided with an upwardly open inhalation conduction check valve 4011, When the oil-filled device inhales, the inhalation conduction check valve 4011 is opened; the expiratory flow channel 402 is provided with an expiratory conduction check
  • the moisture isolation valve 4 is in the closed state as shown in Figure 2; when the oil-filled equipment inhales, the suction in the moisture isolation valve 4 The air conduction check valve 4011 is opened, and the moisture isolation valve 4 is in the inhalation state as shown in Figure 3; when the oil-filled device inhales, the exhalation check valve 4021 on the moisture isolation valve 4 is opened, and the moisture isolation valve 4021 is opened.
  • the valve 4 is in an exhaled state as shown in FIG. 4 .
  • the main moisture absorber 1 includes a vertical cylindrical casing 101; the cylindrical casing 101 is provided with a moisture absorption box 102, and the moisture absorption box 102 is densely provided with ventilation holes, and the moisture absorption
  • the box 102 is provided with color-changing silica gel and a temperature sensor for detecting the temperature of the color-changing silica gel; correspondingly, the interior of the cylindrical housing 101 is also provided with a magnetron microwave heating device 104 for heating the color-changing silica gel and a magnetron microwave heating device 104 for heating the color-changing silica gel.
  • the top and bottom of the cylindrical housing 101 are respectively provided with a first solenoid valve 106 and a second solenoid valve 107 ; the structure of the auxiliary moisture absorber 2 is the same as that of the main moisture absorber 1 .
  • the moisture absorption box 102, the magnetron microwave heating device 104 and the load cell 105 are arranged in order from top to bottom, and the moisture absorption box 102 and the magnetron microwave heating device 104 are constrained in the circumferential direction,
  • the vertical direction can move in the gap with the top, and the load cell 105 can freely bear the weight of the magnetron microwave heating device 104 and the moisture absorption box 102 equipped with the color-changing silica gel and the temperature probe in the vertical direction.
  • the material of the moisture absorption box 102 is plastic;
  • the weighing sensor 105 is a high temperature type diaphragm box fully sealed weighing sensor with a rated temperature of 180°C;
  • the magnetron microwave heating device 104 and all
  • An insulating layer 103 is provided between the load cells 105 .
  • the first solenoid valve 106 is connected to the elbow 1061 to form an outlet facing downward; the outlet of the second solenoid valve 107 faces downward.
  • the moisture absorption system is connected with the control system, and the control system controls the operation of the relevant components.
  • the operation control method of the moisture absorption system of the oil-filled equipment is as follows:
  • the two-position three-way solenoid valve 3 is powered off, the main moisture absorber 1 works, and the auxiliary moisture absorber 2 does not work;
  • the two-position three-way solenoid valve 3 the magnetron microwave heating device 104, the first solenoid valve 106, and the second solenoid valve 107 simultaneously
  • the magnetron microwave heating device 104 heats the discolored silica gel in the main moisture absorber 1, and the heating temperature is controlled to be 100-120 °C, and the generated water vapor passes through
  • the first solenoid valve 106 is discharged, and the generated condensed water is discharged through the solenoid valve at the bottom, until the water absorption of the discolored silica gel in the main moisture absorber 1 drops to the second set threshold, the magnetron microwave heating device 104, the first The solenoid valve 106 and the second solenoid valve 107 are de-energized at the same time, the magnetron microwave heating device 104 stops heating
  • the implementation is realized by an electronic delay relay), the residual water vapor after the silica gel regeneration is absorbed by the silica gel, the two-position three-way solenoid valve 3 is powered off, and the main moisture absorber 1 is switched back to work (the purpose of the delay switching is to prevent the main moisture absorber. 1 After the completion of the discoloration silica gel regeneration, the residual water vapor enters the oil pillow);
  • the first set threshold is 26% of the weight of the color-changing silica gel (the color-changing silica gel can absorb water up to more than 30% of its own weight, and the general failure critical point is 31-37%, and the technology of the present application is implemented.
  • the first set threshold value can also be other values lower than the failure critical point, and the first set threshold value to trigger the regeneration of the color-changing silica gel in the main moisture absorber 1 and the color-changing silica gel in the auxiliary moisture absorber 2 can be selected.
  • the setting of the first setting valve that triggers the regeneration of the color-changing silica gel in the auxiliary moisture absorber 2 should ensure that the color-changing silica gel in the auxiliary moisture absorber 2 will not fail during the regeneration of the color-changing silica gel in the main moisture absorber 1).
  • the second set threshold is 2% of the weight of the color-changing silica gel.
  • the set time is 30 minutes.
  • the discolored silica gel in the main moisture absorber 1 is immersed in a xylitol solution; Saturated xylitol solution (can also be other concentrations during implementation), soak for 5min, take it out, carry out heating regeneration, wait for the color to return to the initial state, and then put it into the moisture absorption box 102; the set time is 10min.
  • the self-weight of the color-changing silica gel involved in the operation control method is the initial weight of the color-changing silica gel placed in the moisture absorption box 102 after the immersion treatment.
  • the discolored silica gel in the main moisture absorber is immersed in xylitol solution, which contains xylitol (the dried silica gel is placed in the xylitol solution, the silica gel will absorb water quickly, and the xylitol molecules will also enter the interior of the silica gel. In the micropore, after taking it out, it is heated and regenerated, the absorbed water volatilizes, and the xylitol remains inside the silica gel).
  • the silica gel absorbs and regenerates the residual water vapor, and the absorbed water encounters xylitol to dissolve the xylitol, absorb heat, and play a cooling role, so that the residual water vapor that has not been absorbed condenses and is quickly absorbed by the silica gel.
  • the delay time of restarting the main moisture absorber after the regeneration of the main moisture absorber is shortened, thereby shortening the power-on time of the two-position three-way solenoid valve, further reducing the failure rate of the two-position three-way solenoid valve, and improving the reliability of the system.
  • the delay time is set to 10min, so that the silica gel can fully absorb the water vapor remaining in the regeneration, and the delay time is shortened.
  • the color-changing silica gel can be replaced by other hygroscopic materials that can be regenerated by heating and dehydration;
  • Other logic work; the parameters (temperature, time, etc.) in the operation control method of the present application can also be selected with different values from the above-mentioned embodiments, as long as they are within the scope of the solution of the present application, the invention purpose of the present application can be achieved.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Drying Of Gases (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)

Abstract

Un système d'absorption d'humidité d'un appareil rempli d'huile, le système d'absorption d'humidité comprenant un absorbeur d'humidité principal et un absorbeur d'humidité auxiliaire ; les parties supérieures de l'absorbeur d'humidité principal et de l'absorbeur d'humidité auxiliaire sont respectivement en communication avec un premier orifice de sortie de trajet et un second orifice de sortie de trajet d'un robinet électromagnétique à trois voies à deux positions au moyen de conduites ; les parties inférieures de l'absorbeur d'humidité principal et l'absorbeur d'humidité auxiliaire sont respectivement en communication avec une ouverture de ventilation supérieure d'un robinet résistant à l'humidité au moyen de conduites ; l'intérieur du robinet résistant à l'humidité est pourvu d'un passage d'aspiration d'air et d'un passage d'évacuation d'air, et deux extrémités du passage d'aspiration d'air et deux extrémités du passage d'évacuation d'air sont respectivement en communication avec l'ouverture de ventilation supérieure et une ouverture de ventilation inférieure du robinet résistant à l'humidité ; un robinet unidirectionnel de conduction d'aspiration d'air est disposé dans le passage d'aspiration d'air ; et un robinet unidirectionnel de conduction d'évacuation d'air est disposé dans le passage d'évacuation d'air. Le système d'absorption d'humidité d'un appareil rempli d'huile présente les avantages d'être sans entretien, propre et respectueux de l'environnement, et d'une fiabilité élevée. D'une manière correspondante, la présente invention concerne également un procédé de commande de fonctionnement destiné au système d'absorption d'humidité d'un appareil rempli d'huile, ledit procédé pouvant empêcher une situation où un gel de silice est traité tandis que ce dernier présente encore un effet d'absorption d'humidité ou le gel de silice n'est pas traité même après avoir perdu son efficacité, et rend la fiabilité du système élevée.
PCT/CN2021/086864 2021-03-29 2021-04-13 Système d'absorption d'humidité d'un appareil rempli d'huile et procédé de commande de fonctionnement d'un système d'absorption d'humidité Ceased WO2022205503A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202110334822.3A CN113069897B (zh) 2021-03-29 2021-03-29 充油设备的吸湿系统及其运行控制方法
CN202110334822.3 2021-03-29

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WO2022205503A1 true WO2022205503A1 (fr) 2022-10-06

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