To obtain oil-free compressed air, the following methods and technologies can be used:
1. Use oil-free air compressor
- definition and principle: The oil-free air compressor does not use lubricating oil during the compression process, thereby preventing lubricating oil from entering the compressed air and directly outputting low-oil or nearly oil-free compressed air.
- Advantage: The purity of the compressed air is guaranteed from the source without subsequent complicated degreasing treatment.
- Application: Widely used in industries with high air quality requirements, such as food, medicine, electronics, laboratories, etc.
2. Precision filter and activated carbon filter combination
- precision filter: Through the aperture of the filter element and the filter element structure, the pollutant particles are removed in the form of direct interception, inertial collision, diffusion interception and coalescence, which can remove most of the suspended oil and liquid oil, but the oil vapor removal effect is not good.
- Activated carbon filter: Using the large specific surface area and strong adsorption capacity of activated carbon, the oil vapor in the compressed air can be effectively adsorbed and removed, and the purity of the air can be further improved.
- combined use: The combination of precision filter and activated carbon filter can realize the comprehensive removal of oil droplets, oil mist and oil vapor in compressed air, and achieve a high oil-free standard.
3. Freeze dryer and precision filter combination
- freeze dryer: Through the heat exchange between the refrigerant and the compressed air, the difference in saturated vapor pressure of water vapor at different temperatures is used to condense a large amount of water vapor into liquid water and discharge it, while reducing the content of oil vapor.
- combined use: The combination of the refrigeration dryer and the precision filter can further remove the oil droplets, oil mist and oil vapor in the compressed air while removing the water. Because the saturated vapor pressure of oil vapor at different temperatures is different, the lower the temperature, the lower the saturated vapor pressure of the corresponding substance in the oil, so the low temperature state is more conducive to the removal of oil.
- Effect: This combination can achieve higher oil removal efficiency, usually up to 99%.
4. Catalytic oxidation oil removal purifier
- principle: Oil removal based on chemical reactions. The oil impurities in the compressed air undergo a complex chemical reaction with oxygen on the surface of the catalyst, which breaks the carbon chain of the oil impurities and eventually oxidizes to form carbon dioxide and water.
- Advantage: The oil removal effect is continuously constant, which can remove oil mist and oil vapor at one time, with high removal efficiency and is not affected by the fluctuation of inlet oil content.
- Application: Suitable for occasions with extremely high air quality requirements, such as the production of high-precision electronic products, semiconductor manufacturing, etc.
Precautions
- equipment selection: Select the appropriate equipment combination and model according to actual needs to ensure that the air quality requirements can be met.
- Maintenance: Regularly maintain the equipment to ensure its normal operation and extend its service life.
- online monitoring: Through online monitoring of gas quality, timely understanding of air quality conditions, and according to the monitoring results to adjust equipment operating parameters or replace the filter element, etc.
Through the above methods and technologies, oil-free compressed air can be effectively obtained to meet the high requirements of air quality in different industries.
