Application analysis of air compressor in chemical fiber industry

1. The core demand for compressed air in the chemical fiber industry

1. Pressure grading requirements：
   • spinning step: 0.6-0.8MPa (6-8Bar) is needed to stabilize the air pressure to ensure uniform ejection of the melt.
   • drafting process: Adopt 0.4-0.6MPa (4-6Bar) graded pressure adjustment to adapt to the needs of different fiber varieties.
   • winding process: Requirements 0.3-0.5MPa (3-5Bar) clean air source, equipped with 0.01μm terminal filtration.
   • public Works: Auxiliary systems such as pneumatic conveying and instrument control adopt a basic pressure of 0.5-0.7MPa (5-7Bar).
2. air quality requirements：
   • oil content: ≤0.1mg/m³, to avoid oil pollution of fibers or equipment.
   • water content: Pressure dew point ≤4℃ to prevent pipeline condensate from affecting production.
   • dust content: ≤1μm, dust particle concentration ≤1mg/m³, protecting precision equipment.

2. Types of air compressors commonly used in the chemical fiber industry

1. screw air compressor

• application scenarios：
  • Instrument gas and suction gun: Provide stable, oil-free, medium and low pressure compressed air to ensure the accuracy of spinning and drafting processes.
  • Small and medium traffic demand: Suitable for winding processes and auxiliary systems, balancing efficiency and maintenance costs.
• advantages：
  • efficient and stable: Strong continuous operation capabilities and long maintenance intervals (usually every 8000 hours).
  • Oil-free configuration: Adopt oil-free screw technology to meet the strict requirements of the chemical fiber industry for air purity.
  • strong adaptability: The pressure requirements of different processes can be matched through frequency conversion adjustment.

2. centrifugal air compressor

• application scenarios：
  • High-flow public works: For example, the compressed air station provides process gas, kinetic energy and air gun gas for the whole factory.
  • continuous production: Suitable for chemical fiber projects with a scale of 1 million tons/year and above, such as polyester POY and DTY fiber production.
• advantages：
  • high-efficiency energy-saving: 5%-10% higher energy efficiency than screw type, and annual energy saving can reach 8 – 16 million yuan (taking four units as an example).
  • stable and reliable: Adopt integrated gear design for uninterrupted operation throughout the year to avoid waste wire or delivery delays caused by downtime.
  • Low pressure and high flow: Meet the needs of large-scale pneumatic transportation and drying in chemical fiber production.

3. piston air compressor

• application scenarios：
  • Early small chemical fiber factory: Used for low-pressure auxiliary systems, and has now been gradually replaced by screw type.
  • Special high-pressure requirementsFor example, maintenance of some old equipment or specific process links.
• limitations：
  • maintain complex: Need to replace piston rings, valves and other parts frequently, not suitable for continuous production.
  • less efficient: In small and medium traffic scenarios, the energy efficiency is lower than that of screw and centrifugal models.

3. Selection suggestions and industry trends

1. selection principle：
   • oil-free priority: The chemical fiber industry must use oil-free screws or centrifugal compressors to ensure air purity.
   • Energy efficiency and stability: Centrifugal type is preferred for large-scale projects; screw type is selected for scenarios with small and medium-sized scale or diverse pressure requirements.
   • maintenance costs: The screw type is simple to maintain and suitable for enterprises with limited budgets; the centrifugal type has high initial investment, but has significant long-term energy-saving benefits.
2. industry trends：
   • Centrifugal proportion increase: With the expansion of chemical fiber production capacity, centrifugal compressors are increasingly used in large-scale projects due to their efficient and energy-saving characteristics.
   • Popularization of oil-free technology: Oil-free screw compressors have become standard, and some companies even adopt centrifugal oil-free solutions to further improve air quality.
   • intelligent control: Integrate frequency conversion regulation, remote monitoring and other technologies to optimize pressure stability and energy consumption management.

IV. Conclusion

Chemical fiber industry mainly usesscrew air compressor(oil-free) andcentrifugal air compressor。The screw type is suitable for medium and low pressure, high-purity purity requirements (such as instrument gas, wire suction gun); the centrifugal type is suitable for large flow, continuous operation of public engineering and process gas supply. Piston type has gradually withdrawn from mainstream applications due to efficiency and maintenance issues. Enterprises should select the most suitable model based on production scale, pressure requirements and budget to ensure product quality and production efficiency.