Molecular Sieve Nitrogen Generator

A molecular sieve nitrogen generator utilizes high-quality carbon molecular sieves and operates based on the principle of Pressure Swing Adsorption (PSA) to extract nitrogen from air. Under certain pressure conditions, purified and dried compressed air passes through an adsorber where oxygen is preferentially adsorbed due to its faster diffusion rate compared to nitrogen. As a result, nitrogen is enriched and collected as the final product. The adsorbent is regenerated by releasing pressure, allowing desorption of oxygen and other impurities.

A standard system includes two adsorption towers that operate alternately to ensure continuous nitrogen generation. The entire process is controlled by a PLC (Programmable Logic Controller) that automatically manages valve operations for efficient and stable performance.

System Components

1. Compressed Air Purification Unit

• Function: Removes oil, moisture, and dust from compressed air.
• Key Equipment:
  • Pipeline filters
  • Refrigerated dryer
  • Fine and ultra-fine filters
  • Oil removal unit (optional)
• Purpose: Ensures long-term protection and performance of the carbon molecular sieve.

2. Air Storage Tank

• Function: Buffers and stabilizes compressed air flow.
• Benefits:
  • Minimizes pressure fluctuations
  • Reduces load on purification and separation systems
  • Provides surge capacity for rapid pressurization of adsorption towers

3. Nitrogen-Oxygen Separation Unit

• Structure: Twin-tower adsorption system (Tower A & B)
• Process:
  • One tower adsorbs oxygen while the other regenerates
  • Clean nitrogen exits the outlet while impurities are removed during regeneration
  • Unqualified nitrogen is automatically vented to maintain output quality
• Control: Fully automated via PLC with real-time purity monitoring

4. Nitrogen Buffer Tank

• Function: Maintains consistent nitrogen purity and pressure
• Additional Role:
  • Stabilizes nitrogen delivery
  • Protects adsorption beds during tower switching

Technical Specifications

• Flow Rate: 3–2000 Nm³/h
• Purity: 95% – 99.9995%
• Dew Point: ≤ -40℃
• Working Pressure: ≤ 0.6 MPa (adjustable)

Key Features

1. Optimized internal design for uniform airflow and reduced impact
2. Advanced process engineering for improved efficiency
3. Patented molecular sieve protection for extended service life
4. Automatic discharge of low-purity nitrogen to ensure quality
5. Optional remote monitoring, flow/purity adjustment systems
6. High automation with easy operation and stable performance

Applications

• Metallurgy: Protective gas during heat treatment
• Chemical Industry: Nitrogen blanketing and purging
• Rubber & Plastics: Process gas
• Food & Beverage: Oxygen removal, freshness preservation, and nitrogen packaging
• Pharmaceutical: Container purging and storage preservation
• Electronics: Inert atmosphere for semiconductor and PCB manufacturing

Purity, flow rate, and pressure can be tailored to specific customer needs.

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