LH-38Y-30 Type Gas Recovery and Filling Equipment

I. Overview

The SF6 gas recovery and filling unit is used by manufacturers of SF6-insulated electrical equipment, as well as in operation, research, and scientific departments. It is designed for vacuum evacuation of various electrical equipment, filling them with SF6 gas, and recovering SF6 gas from used or tested equipment. It also performs purification, compression, liquefaction, and storage in tanks. The recovery unit is suitable for on-site installation and use of SF6 electrical equipment of various voltage levels and GIS combined electrical equipment.

The device is manufactured in accordance with the National Power Department's DL/T662-1999 standard for "Inflating and Recovery Equipment," and references products from world-renowned brands. It is a recovery unit developed with national patented technology. The unit consists of a recovery system, inflation system, vacuum extraction system, purification system, and gas storage system, featuring the following main functions:

1. Measurement of the unit itself and electrical equipment, storage tanks, vacuum extraction, and vacuum levels.

2. Recycle the SF6 gas in electrical equipment.

3. Dry and purify SF6 gas from recycling and recharging.

4. Rapidly gasify and inflate SF6 electrical equipment.

5. Compress and store SF6 gas in a liquid state for electrical equipment.

Recycling unit main components and their advantages:

(1) Utilizing the system principles from Germany's DILO company and complementing them with the internationally advanced condensation liquefaction method, we reduce the system's working pressure, enhance the efficiency of recovery, and offer an advanced design with comprehensive functions, rational structure, and simple, clear operation.

(2) SF6-specific compressor incorporating foreign compression technology, utilizing this compressor and condensation cooling can directly compress SF6 gas into a liquid for storage in SF6 storage tanks, achieving oil-free and rapid recovery of SF6 gas.

(3) The vacuum system utilizes a two-stage scroll vacuum pump for fast vacuum rate, and is equipped with a device to prevent oil return.

(4) The purification system utilizes the principle filter from the U.S. Neil Company, featuring a double-stage internal electric heating and high-efficiency adsorbent inside, resulting in a more pronounced purification effect (adsorbent replacement is not required frequently).

(5) Automatic confirmation and adjustment of three-phase power supply for electrical system.

(6) The device control system employs patented SF6-specific valves, which are more reliable than similar ball valves from overseas. (Utilizing the valve cores from American Nylese valves)

(7) Storage systems are configured with liquid tanks according to customer requirements.

(8) The equipment is wind-cooled and mobile, capable of operation without an external water source.

III. Main Technical Performance Indicators

Type: Mobile, Air-cooled

(2) Working Principle:

a. Utilize a two-stage compressor system for SF6 gas liquefaction and recovery.

b. Condensers, heat exchangers, and fan-assisted gas recovery and refueling.

c. Inflated by introducing air through a buffer.

(3) Working Environment Temperature: -10℃ to +40℃

(4) Main Performance and Technical Parameters (Model: LH-38Y-30)

1. Ultimate vacuum degree of the device < 10 Pa

2. Vacuum pump with a vacuum rate of 30L/s, (limiting ultimate vacuum less than 6×10-2Pa for 108m3/h vacuum pump)

LH-38Y-30 Type Gas Recovery Purification Filling and Emptying Unit

3. Initial inflation pressure of the device < 133 Pa (user-defined as required)

4. Final inflation pressure of the device ≤ 0.8 MPa

5. Inflation Rate > 6~10 m³/h

6. Initial Pressure of Device Recovery ≤ 0.8 MPa

7. Final Pressure of Device Recovery < 5 kPa

8. Recycle Compressor with a Rate of 22 m³/h

9. Annual leakage rate of the device < 1%

10. 400L Storage Tank (max design pressure 4.0 MPa)

11. Approximate dimensions: 1860mm x 1280mm x 1860mm

12. Storage Method: Room Temperature Liquid

Noise level ≤ 65 dB(A)

14. Regeneration Method of Dry Filter: Vacuum self-regeneration with heating and activation treatment

15. Gas Recovery Quality: Complies with GB8905-88 Standard, IEC Standard

16. Power: AC three-phase 380V ±10%, 50Hz

Unit total power < 12KW

18. Unit Weight: 1,500 kg

IV. Main Components and Configuration of the Equipment:

The main functional components of the equipment include SF6 compressors, condensation systems, vacuum pumps, heat exchangers, fans, desiccant filter regenerators, heaters, purifiers, filters, pipes, valves, instruments, electrical control systems, and structural parts, such as frame panels, casters, and storage tanks.

(1) Recycled 2Z Type Double-Cylinder Double-Stage Single-Action Compressor (using imported main unit products).

System Storage: Utilizes ambient temperature liquid storage with extreme high-pressure automatic control to ensure safety.

(3) Vacuum Pump: Equipped with a 2X type two-stage scroll vacuum pump (Joint venture with German technology).

(4) Purification and Drying Filtration System: The drying filter incorporates an internal electric heating element and a high-efficiency adsorbent, boasting strong self-regeneration capabilities to regenerate and dry the gas, ensuring the purity of SF6 gas. (Utilizes the Penneal principle filter from the USA, with dual-stage filtration and vacuum activation for self-regeneration).

(5) Purifier: Utilizes the D-48 model from the U.S. ALCO product, capable of purifying impurities and powders in gases, ensuring the purity of SF6 gas and enhancing the reliability of electrical equipment operation.

(VI) Valves: Utilize imported Nalges SF6 specialized valves with excellent sealing properties, capable of withstanding high pressure and high vacuum conditions.

(Seven) Electrical Control System: Valves and instruments use imported joint venture products, centrally arranged for ease of operation and monitoring.

Five: A set of factory documents for the recycling equipment

Nantong Keyuan Electric Equipment Co., Ltd. produces recycling and charging equipment, which is an essential device for the manufacturing, installation, and maintenance of high-voltage transmission and transformation equipment. The products are developed by absorbing and integrating technologies from companies like LIMCO in the U.S., DILO in Germany, and MICAFIL in Switzerland, combined with the company's years of production experience. They are researched and developed using advanced compression liquefaction technology and patented technologies from abroad. The recycling equipment consists of a recovery system, inflation system, vacuum extraction system, purification system, and gas storage system. The product has been certified by experts, with all performance indicators reaching the international advanced level. It has won the Gold Award at the first China Youth Science and Technology Fair and the Gold Award at the China High-Tech New Products Fair.