SF6 tail gas recovery system for micro-water test

Abstract

The utility model discloses an SF6 tail gas recovery system for a micro-water test, which comprises a pressurizing unit, a control display unit and a recovery unit, the pressurizing unit comprises a pressurizing device and a regulating valve, the control display unit comprises a controller, the recovery unit comprises a recovery gas cylinder, and the recovery gas cylinder is connected with the regulating valve. The regulating valve, the supercharging device and the recovery gas cylinder are sequentially connected in the flowing direction of tail gas, the controller is used for controlling the supercharging device to start and stop, and the controller is further used for controlling opening and closing of the regulating valve and the opening degree of the regulating valve; according to the SF6 tail gas recycling system for the micro-water test, the recycling pressure of SF6 tail gas is effectively improved through the additionally-arranged pressurizing unit, meanwhile, loss in the tail gas recycling process is reduced in cooperation with the recycling gas cylinder, and the tail gas recycling rate is effectively improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of power equipment testing, and relates to an SF6 tail gas recovery system for dew point testing. Background Art

[0002] Dew point testing refers to using a testing instrument to measure the moisture content in sulfur hexafluoride gas (SF6), a commonly used insulating gas in gas insulated switchgear (GIS). During the dew point testing process, after the SF6 gas in the GIS equipment is detected by the instrument, the discharged SF6 tail gas is recovered and stored accordingly. SF6 gas has high electrical insulation performance, but it is also a greenhouse gas that has a negative impact on global climate change. Reducing SF6 tail gas emissions is crucial for environmental protection. By increasing the recovery rate of SF6 tail gas, the consumption of SF6 gas can be reduced, preventing on-site operators from inhaling SF6 tail gas, and at the same time reducing environmental pollution.

[0003] The expected recovery rate of SF6 tail gas in dew point testing is above 90%. However, during actual operation, the average tail gas recovery rate of a single dew point test is about 75%. Through research, it is found that the tail gas loss in dew point testing mainly occurs in the recovery link. The existing tail gas recovery device directly connects an aluminum foil bag at the end of the test instrument to recover the tail gas. The pressure of the directly discharged tail gas is low, and the volume of the aluminum foil bag is small and needs to be replaced frequently, which leads to tail gas loss during the recovery process, thereby affecting the tail gas recovery rate.

[0004] To solve the above problems, a tail gas recovery system is needed that can effectively increase the recovery rate of SF6 tail gas in dew point testing. Summary of the Utility Model

[0005] In view of this, the utility model provides an SF6 tail gas recovery system for dew point testing. The added pressurization unit effectively increases the recovery pressure of SF6 tail gas. At the same time, in cooperation with the recovery gas cylinder, the loss during the tail gas recovery process is reduced, and the tail gas recovery rate is effectively increased.

[0006] The utility model discloses an SF6 tail gas recovery system for dew point testing, which includes a pressurization unit, a control and display unit, and a recovery unit. The pressurization unit includes a pressurization device and a regulating valve. The control and display unit includes a controller. The recovery unit includes a recovery gas cylinder. The regulating valve, the pressurization device, and the recovery gas cylinder are connected in sequence according to the flow direction of the tail gas. The controller is used to control the start and stop of the pressurization device, and the controller is also used to control the opening and closing and the opening degree of the regulating valve.

[0007] Further, the pressurization unit further includes a buffer bottle, and the buffer bottle is arranged in front of the regulating valve.

[0008] Further, the control and display unit further includes a differential pressure sensor, which has a first detection port and a second detection port. The first detection port communicates with the position between the buffer bottle and the regulating valve, and the second detection port communicates with the position between the pressurizing device and the recovery gas cylinder. The controller is used to receive the pressure difference monitored by the differential pressure sensor.

[0009] Further, it further includes a support trolley, and the recovery gas cylinder is detachably installed on the support trolley.

[0010] Further, the support trolley is provided with an equipment box, and the controller, the differential pressure sensor and the pressurizing unit are installed in the equipment box.

[0011] Further, the control and display unit further includes a display screen, which is installed on the surface of the equipment box, and the display screen is electrically connected to the controller.

[0012] Further, the pressurizing unit further includes an air inlet interface and an air outlet interface. The air inlet interface is arranged in front of the buffer bottle, and the air outlet interface is arranged behind the pressurizing device. The air pump is detachably connected to the recovery gas cylinder through the air outlet interface.

[0013] Further, the support trolley is installed with a support frame, the support frame is hingedly installed on the support trolley in a limited way, and the equipment box is installed on the support frame.

[0014] Advantages of the present utility model:

[0015] The present utility model discloses an SF6 tail gas recovery system for micro-water test. By adding a pressurizing unit, the recovery pressure of SF6 tail gas is effectively increased; using a recovery gas cylinder instead of the original recovery bag, the gas cylinder not only has a larger capacity but also is more resistant to high pressure. Cooperating with the pressurizing unit, the loss of SF6 tail gas during the recovery process is effectively reduced, and the recovery rate of SF6 tail gas in the micro-water test is effectively improved.

[0016] At the same time, setting a regulating valve can effectively adjust the overall flow according to the actual situation. The control and display unit realizes the control of the entire recovery system, and the support trolley provides convenience for the use and movement of the entire system. Description of the drawings

[0017] Figure 1 It is the front view of the present utility model;

[0018] Figure 2 It is the left view of the present utility model;

[0019] Figure 3 It is the structural schematic diagram of the equipment box of the present utility model. Detailed implementation manners

[0020] It should be noted that in the description of this specification, the orientation or positional relationship indicated by terms such as "upper", "lower", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention. In this embodiment, the front and back are based on the direction of the exhaust gas flow.

[0021] The present invention discloses an SF6 exhaust gas recovery system for micro-water tests, which includes a pressurization unit, a control and display unit, and a recovery unit. The pressurization unit includes a pressurization device 10 and a regulating valve 9. The control and display unit includes a controller 12. The recovery unit includes a recovery gas cylinder 1. The regulating valve 9, the pressurization device 10, and the recovery gas cylinder 1 are connected in sequence according to the flow direction of the exhaust gas. The controller 12 is used to control the start and stop of the pressurization device 10. The controller 12 is also used to control the opening and closing of the regulating valve 9 and the size of the opening degree. In this embodiment, the pressurization device 10 is an air pump, which can effectively increase the pressure during the exhaust gas recovery process; the regulating valve 9 is an electric needle valve, which is easy to control and has a fast response speed; the recovery gas cylinder 1 is an SF6 gas cylinder with a volume of 40L, which not only has a large volume but also is resistant to high temperatures. The gas cylinder cooperates with the pressurization unit, effectively reducing the loss of SF6 exhaust gas during the recovery process and effectively improving the recovery rate of SF6 exhaust gas in micro-water tests. The controller 12 can be a single-chip microcomputer or an FPGA (Field-Programmable Gate Array, a programmable integrated circuit) that can edit control programs; in this embodiment, the controller 12 selects an FPGA with the model number EP4CE10F17C8N. The controller 12 can control the start of the pressurization device 10, can control the opening and closing of the regulating valve 9 to control whether the entire recovery system is unobstructed, and can also control the opening degree of the regulating valve 9. By controlling the opening degree of the regulating valve 9, the flow rate in the entire system can be effectively adjusted.

[0022] The pressurization unit in this embodiment further includes a buffer bottle 8, and the buffer bottle 8 is arranged in front of the regulating valve 9. As shown in the figure, after the exhaust gas first flows into the buffer bottle 8, it is then pressurized by the regulating valve 9 and the pressurization device 10 and finally enters the recovery gas cylinder 1. The setting of the buffer bottle 8 can make the exhaust gas more stable, smooth, and continuous during the recovery process.

[0023] In this embodiment, the control and display unit further includes a differential pressure sensor 11, which has a first detection port and a second detection port. The first detection port is connected to the position between the buffer bottle 8 and the regulating valve 9, and the second detection port is connected between the pressurizing device 10 and the recovery gas cylinder 1. The controller 12 is configured to receive the pressure difference monitored by the differential pressure sensor 11. The differential pressure sensor 11 is mainly used to monitor the pressure difference between the outlet of the buffer bottle 8 and the outlet of the pressurizing device 10. Since the pressurizing device 10 is ultimately connected to the recovery gas cylinder 1 and its flow rate is larger than the flow rate entering the buffer bottle 8, the opening degree of the regulating valve 9 needs to be adjusted according to the feedback value of the differential pressure sensor 11 for the intake pressure. The final adjustment and control ensure that the flow rate entering the buffer tank is equal to the flow rate drawn away at the outlet connection.

[0024] In this embodiment, the pressurizing unit further includes an air inlet interface 6 and an exhaust interface 7. The air inlet interface 6 is arranged in front of the buffer bottle 8, and the exhaust interface 7 is arranged behind the pressurizing device 10. The air pump is detachably connected to the recovery gas cylinder 1 through the exhaust interface 7. The air inlet interface 6 is for facilitating the connection of the buffer bottle 8 to the micro-water test instrument to allow the tail gas to enter the system, and the exhaust interface 7 is for facilitating the connection of the outlet of the pressurizing device 10, i.e., the air pump, to the recovery gas cylinder 1 to complete the final recovery of the tail gas. In this embodiment, unless otherwise specified, the components through which the tail gas flows in, such as the buffer bottle 8, the regulating valve 9, and the pressurizing device 10, are all connected through pipelines, while the electrical components or control circuits are electrically connected.

[0025] In this embodiment, it further includes a support trolley 3, and the recovery gas cylinder 1 is detachably installed on the support trolley 3. The support trolley 3 is provided with an equipment box 2, and the controller 12, the differential pressure sensor 11 and the boosting unit are installed in the equipment box 2. In this embodiment, the control and display unit further includes a display screen 5, and the display screen 5 is installed on the surface of the equipment box 2. The display screen 5 is electrically connected to the controller 12. The display screen 5 adopts an LCD12864_COG graphic liquid crystal display screen, which is composed of a row driver / column driver and a 128×64 full dot matrix liquid crystal display. It can display 6×4 (8×16 dot matrix) ASCII codes, and realizes real-time status display through serial communication, which is easier and more useful than other methods; by controlling the data line, clock line, and chip select port, the change of its working status and display data is realized. At the same time, relevant manual buttons can also be set on the equipment to facilitate manual operation. The support trolley 3 is installed with a support frame 4, and the support frame 4 is hinged to the support trolley 3 in a limited way, and the equipment box 2 is installed on the support frame 4. As shown in the figure, the support trolley 3 in this embodiment is provided with two parallel wheels, and the recovery gas cylinder 1 and the support frame 4 are respectively arranged on both sides of the support trolley 3. The recovery gas cylinder 1 is fixed and limited by a fixing device 301 (such as a strap, a hoop, etc.) on the support trolley 3. The support frame 4 is hinged to the support trolley 3, and a link mechanism 401 is arranged on the support frame 4 to lock and limit the swing of the support frame 4. One end of the link structure is connected to the middle of the support frame 4, and the other end is connected to the support trolley 3. The setting of the support frame 4 enables the entire recovery device to be laid down and used obliquely.

[0026] It should be noted that how the controller 12 controls the operation of each component of this system through a set program and how to write the corresponding control program are all applications of conventional technical means in this field, so they will not be elaborated here.

[0027] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. An SF6 tail gas recovery system for micro-water test, characterized in that: It includes a boosting unit, a control and display unit and a recovery unit. The boosting unit includes a boosting device and a regulating valve. The control and display unit includes a controller. The recovery unit includes a recovery gas cylinder. The regulating valve, the boosting device and the recovery gas cylinder are connected in sequence according to the flow direction of the exhaust gas. The controller is used to control the start and stop of the boosting device. The controller is also used to control the opening and closing of the regulating valve and the size of the opening.

2. The SF6 tail gas recovery system for micro-water test according to claim 1 is characterized in that: The pressurizing unit further includes a buffer bottle, which is arranged in front of the regulating valve.

3. The SF6 tail gas recovery system for micro-water test according to claim 2 is characterized in that: The control display unit also includes a differential pressure sensor, which has a first detection port and a second detection port. The first detection port is connected to a position between the buffer bottle and the regulating valve, and the second detection port is connected to a position between the boosting device and the recovery gas bottle. The controller is used to receive the pressure difference monitored by the differential pressure sensor.

4. The SF6 tail gas recovery system for micro-water test according to claim 3 is characterized in that: It also includes a supporting trolley, and the recovery gas cylinder is detachably mounted on the supporting trolley.

5. The SF6 tail gas recovery system for micro-water test according to claim 4 is characterized in that: The supporting trolley is provided with an equipment box, and the controller, the differential pressure sensor and the boosting unit are installed in the equipment box.

6. The SF6 tail gas recovery system for micro-water test according to claim 5 is characterized in that: The control and display unit also includes a display screen, which is mounted on the surface of the device box and is electrically connected to the controller.

7. The SF6 tail gas recovery system for micro-water test according to claim 2 is characterized in that: The boosting unit also includes an air inlet interface and an exhaust interface. The air inlet interface is arranged in front of the buffer bottle, and the exhaust interface is arranged behind the boosting device. The air pump is detachably connected to the recovery gas bottle through the exhaust interface.

8. The SF6 tail gas recovery system for micro-water test according to claim 6 is characterized in that: The support trolley is equipped with a support frame, the support frame can be hingedly mounted on the support trolley in a limited position, and the equipment box is mounted on the support frame.

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