What is the water vapor content at the outlet of screw air compressor

Technical description on water vapor content at the outlet of screw air compressor

During the operation of the screw air compressor, the water vapor content of the outlet compressed air is affected by multiple factors such as equipment performance, environmental conditions and post-treatment processes. The following will provide you with a detailed analysis of the causes, scope of influence and control methods of water vapor content from the perspective of technical principles and industry practice.

1. The core cause of water vapor content

1. Physical characteristics of the compression process
   • When air is compressed, the temperature increases significantly, resulting in an increase in the evaporation of moisture in the air.
   • After the compressed air is discharged, the temperature gradually decreases, and water vapor condenses into liquid water, forming water vapor.
2. Direct impact of environmental temperature and humidity
   • high temperature and high humidity environment: The initial water content of the air is high, and the water vapor content increases accordingly after compression.
   • a dry environment and at low temperatures: The initial water content of the air is low, and the amount of water vapor generation is reduced.
3. Equipment efficiency and operating parameters
   • exhaust pressure: The higher the pressure, the more significant the temperature increase during the compression process, and the amount of water vapor generation may increase.
   • cooling effect: Efficient cooling system can reduce compressed air temperature and reduce water vapor condensation.

2. Reasonable range of water vapor content and industry standards

1. General industry standards
   • For screw air compressors not equipped with post-treatment equipment, their outlet compressed airrelative humidityis typically70%~90%, the corresponding water vapor content varies depending on the environmental temperature and humidity.
   • After being processed by a dryer, the compressed airpressure dew point(The temperature at which water vapor begins to condense) can drop to2~10℃, meet the needs of most industrial scenarios.
2. Special scene requirements
   • food and medicine: The pressure dew point needs to be controlled toBelow-20 ℃Ensure that the compressed air is absolutely dry.
   • precision manufacturing: Pressure dew point usually requires ≤-40℃Avoid water vapor causing product oxidation or process abnormalities.

3. Control and optimization methods for water vapor content

1. environmental control
   • Control the temperature of the air compressor room to5~35℃, humidity ≤80%, reduce the initial air moisture content.
2. Equipment selection and optimization
   • Choose a screw air compressor equipped with an efficient cooling system to reduce the temperature of the compressed air.
   • Frequency conversion technology is used to adjust the exhaust volume according to gas demand to avoid the increase in condensate caused by long-term low-load operation.
3. Post-processing equipment upgrade
   • Leng gan machine: Reduce the temperature of compressed air by cooling, so that water vapor is condensed and discharged.
   • dryer: Use an adsorbent (such as activated alumina) to directly absorb water vapor to reduce the pressure to the dew pointBelow-40℃。
   • filter: Filter liquid water and tiny water droplets in stages to improve the cleanliness of compressed air.

4. Industry practice suggestions

1. Basic configuration plan
   • generic scene: equipped with cold dryer + precision filter, can control the pressure dew point2~10℃, meet most industrial gas needs.
   • Highly demanding scenarios: Adopt a dry dryer + multi-stage filtration to ensure absolute dryness of the compressed air.
2. Key points of operation and maintenance management
   • Regularly drain condensed water from air storage tanks and dryers to avoid backflow of accumulated water.
   • Check the pressure dew point of compressed air every quarter to ensure that the performance of post-treatment equipment meets standards.
   • Adjust the air compressor loading rate and dryer regeneration cycle according to changes in environmental temperature and humidity.

V. Conclusion

The water vapor content at the outlet of screw air compressor needs to be evaluated based on specific scenarios:

• Not equipped with post-processing equipment: The water vapor content is high and is only suitable for scenarios with low requirements for dryness.
• Equipped with post-processing equipment: The water vapor content can be controlled within a reasonable range through cold dryers, dry dryers, etc., to meet the needs of high-demand fields such as precision manufacturing, food and medicine.

Enterprises should select the most appropriate water vapor control plan based on the production process, environmental conditions and cost budget, and regularly test and maintain equipment to ensure stable and reliable compressed air quality.