How to get oil-free compressed air

To obtain oil-free compressed air, the following methods and techniques can be used:

1. Use an oil-free air compressor

• Definition and principle: The oil-free air compressor does not use lubricant during the compression process, thereby preventing the lubricant from entering the compressed air and directly outputting low-oil or close to oil-free compressed air.
• Advantages: The purity of compressed air is ensured from the source, without the need for subsequent complicated oil removal treatment.
• Application: Widely used in industries with extremely high requirements for air quality, such as food, medicine, electronics, laboratories, etc.

2. Precision filter is used in combination with activated carbon filter

• Precision filter: Through the pore size and filter element structure of the filter element, pollutant particles can be 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 it does not have the effect of removing oil vapor.
• Activated Carbon Filter: Use the large specific surface area and strong adsorption capacity of activated carbon to effectively adsorb and remove oil vapor from compressed air, further improving the purity of the air.
• Combination Use: Combining precision filters with activated carbon filters can achieve comprehensive removal of oil droplets, oil mist and oil vapor in compressed air, reaching a high oil-free standard.

3. Refrigeration dryer is used in combination with precision filters

• Refrigeration dryer: Heat exchange is performed by refrigerant and compressed air, and the difference in saturated vapor pressure is used to make a large amount of water vapor condense into liquid water and discharge it, while reducing the content of oil vapor.
• Combination Use: Using a refrigeration dryer with a precision filter can further remove oil droplets, oil mist and oil vapor in the compressed air while removing moisture. Since the saturated vapor pressure of oil vapor varies at different temperatures, the lower the temperature, the lower the saturated vapor pressure of the corresponding substances in the oil, it is more conducive to the removal of oil at low temperatures.
• Effect: This combination can achieve a higher oil removal efficiency, usually up to more than 99%.

4. Catalytic oxidized oil removal purifier

• Principle: Oil removal is achieved based on chemical reactions. The oil impurities in compressed air undergo complex chemical reactions with oxygen on the surface of the catalyst, causing the oil impurities to break the carbon chain.Finally, it oxidizes to produce carbon dioxide and water.
• Advantages: The oil removal effect is constant and can remove oil mist and oil steam at one time, with high removal efficiency and is not affected by fluctuations in the inlet oil content.
• Application: Suitable for occasions with extremely high requirements for air quality, 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: Regular maintenance and maintenance of the equipment to ensure its normal operation and extend its service life.
• Online Monitoring: By monitoring the gas quality online, you can timely understand the air quality status, and adjust the equipment operating parameters or replace the filter element according to the monitoring results.

Through the above methods and techniques, oil-free compressed air can be effectively obtained to meet the high requirements for air quality in different industries.