The SF6 Gas Recovery Unit is manufactured according to the standard DL/T662 "SF6 Gas Charging and Recovery Equipment" of the Ministry of Electric Power. It comprises an SF6 compressor, vacuum pump, vacuum system with anti-backflow oil device, liquid storage tank, purification system equipped with regenerative drying filters and dust filters, ball valves, vacuum gauge, as well as electrical control systems, pressure detection, thermometer, alarm devices, and other auxiliary instruments for control and monitoring.

The KDQH-300 SF6 Gas Recovery Unit is suitable for the manufacturing, on-site installation, maintenance, and operation of SF6 electrical appliances, GIS combined electrical appliances, and SF6 gas-insulated electrical equipment.

The SF6 Gas Recovery Unit features the following primary functions:

1. Vacuum extraction and measurement for SF6 switches and GIS.

2. Vacuum extraction and measurement for liquefaction tanks.

3. Vacuum extraction and measurement for the unit itself.

4. Gas charging for SF6 switches.

5. Recovery of SF6 gas from electrical equipment, including moisture and oil treatment.

6. Drying and purification processing for recovered and refilled SF6 gas.

7. Recovery and liquefied storage of SF6 gas in SF6 electrical appliances.

8. Incorporates a 300KG capacity storage tank within the device body.

9. Compresses and stores SF6 gas in a liquid state, featuring liquid bottling capability.

10. The unit is portable on wheels.

Alternative names for the product include: SF6 Gas Recovery and Purification Unit, SF6 Vacuum Extraction Unit, SF6 Recovery Vehicle, SF6 Recovery Device.

1. Advanced design, comprehensive functions, and rational structure. The flowchart is illustrated on the panel for simple and clear operation.

2. Compression System: Utilizes a semi-hermetic compressor suitable for SF6, ensuring no leakage.

3. Vacuum Extraction System: Employs a dual-stage direct-drive vacuum pump with an automatic anti-return oil device. It features high gas extraction capacity, making it suitable for prolonged continuous operation.

4. Purification System: Uses the Hankison principle from the USA for filtration. The filters are equipped with electric heating and contain highly efficient specialized adsorbents, providing more significant purification effects (no need for frequent replacement of adsorbents).

5. Electrical System of the Equipment: Confirms three-phase power supply and has automatic protection against phase loss.

6. Control System of the Equipment: Ball valves adopt the Swagelok working principle from the USA, featuring seals with self-compensation capabilities, suitable for both vacuum and pressure conditions specific to SF6.

7. Storage System: Equipped with a 300KG storage tank and a column-type level gauge. The liquid level display is backlit and illuminated for clear, intuitive, and accurate readings. The equipment also features functionality for filling steel cylinders in a liquid state.

8. The device is portable on wheels for easy movement.

Technical Specifications

Type: High-pressure liquefaction, air-cooled, portable on wheels

Operating Ambient Temperature: -10°C to 40°C

Recovery:

Initial Pressure (MPa): 0.8

Final Pressure (MPa): ≤0.053

Time Required for 1m³ Volume (h/m³): ≤0.5

Gas Charging:

Initial Pressure (Pa): ≤133

Final Pressure (MPa): 0.7

Time Required for 1m³ Volume (h/m³): ≤0.2

Vacuum Extraction:

Time Required from 0.1 MPa to 133 Pa (h/m³): ≤1.0

Ultimate Vacuum (Pa): ≤10

Vacuum Retention:

Increase in Value after 24 Hours from 133 Pa (Pa): ≤400

Annual Leakage Rate: ≤0.5%

Purity of Recovered SF6 Gas:

Moisture Content (PPM/V): ≤60

Oil Content (PPM/G): ≤10

Storage Container:

Storage Method: Liquid state

Pressure (MPa): 5.2

Capacity (L): 300

Gas Storage Capacity (kg): 300

Regeneration Method for Drying Filters: Vacuum heating activation regeneration

Power Supply: Three-phase four-wire system, 3Φ 380V

Total Power (kW): ≤18

Noise Level dB(A): ≤75

Equipment Weight (kg): ≤1300