@Air Compressor
2025-04-22
Working pressure of air compressor cooling dryer
The working pressure of the air compressor cooling and drying machine needs to be based onAir compressor exhaust pressureandGas equipment demand pressureComprehensive determination and reasonable selection can balance drying efficiency and equipment life. The following are key parameters and selection suggestions:
1. Standard working pressure range
- Conventional cold drying machine: 0.6-1.6MPa (suitable for most industrial scenarios)
- High-pressure cold drying machine: 1.6-3.0MPa (special process requirements, such as PET blowing)
- Low pressure cold drying machine: 0.2-0.6MPa (gas supply to laboratory or precision instruments)
2. Pressure matching principles
- Cold dryer inlet pressureShould be ≤ the rated exhaust pressure of the air compressor-0.1MPa
- For example: air compressor exhaust pressure 1.0MPa → cold drying machine selection pressure ≤0.9MPa
- Cold dryer outlet pressureNeed ≥ the maximum working pressure of gas equipment +0.05MPa
- For example: equipment demand pressure 0.7MPa → cold dryer outlet pressure ≥0.75MPa
3. Effect of pressure on performance
| pressure interval | drying efficiency | energy consumption coefficient | equipment life |
|---|---|---|---|
| 0.6-0.8MPa | Efficient (dew point ≤-40℃) | 0.8-1.0 | normal |
| 0.8-1.2MPa | Medium (dew point-35℃~-40℃) | 1.0-1.2 | Shorten by 10%-15% |
| >1.2MPa | Low (dew point-30℃~-35℃) | 1.2-1.5 | Shorten by 20%-30% |
4. Handling of special working conditions
- high pressure system（>1.6MPa）：
- Reinforced condenser is required (copper pipe thickness ≥2.5mm)
- Configuration of dual-stage compression refrigeration system (improves evaporation efficiency)
- low pressure system（<0.4MPa）：
- Use inverter compressor (avoid frequent start and stop)
- Add gas-liquid separator (prevent liquid water from entering the equipment)
5. Selection calculation formula
- example: Air compressor exhaust pressure 1.0MPa, pipeline pressure loss 0.05MPa
→ The working pressure of the cold drying machine should be 0.85×1.0 -0.05 = 0.8MPa
maintenance prompt: Long-term overpressure operation of the cold dryer (> 1.1 times the design pressure) will cause heat exchanger deformation and refrigerant leakage. It is recommended to install a pressure sensor and set an alarm threshold (recommended to be 1.05 times the design pressure).