When blowing out the oil and water at all levels of the air compressor, it can be seen that a large amount of water is constantly blown out from the separator. Where does this water come from?
This is because the amount of water that can be accommodated in each cubic meter of air mainly depends on the temperature, and is not closely related to the total air pressure. At 30 ℃ and 0.1MPa pressure, the saturation content of water in the air is 30.3g/m3. If the air is compressed to 0.6MPa and the temperature remains at 30 ℃, the saturated moisture content in each cubic meter of air is still 30.3g/m3. However, as the pressure increases, the air quality contained in each cubic meter of air increases, and the amount of moisture also increases accordingly. When the temperature remains constant and its saturation content remains constant, excess water will precipitate in a liquid state. For the above situation, air with a pressure of 0.6MPa in 1m3 is compressed from air with a pressure of 0.1MPa and a volume of 6m3. The moisture content in 1m3 of air also increases to six times × 30.3 (g/m3)=181.8g/m3. If the temperature remains constant and the air can only hold 30.3g/m3 of water, then five sixths of the water will precipitate. As the pressure increases, the more water precipitates; The better the cooling effect, the more water will precipitate.
For a medium pressure oxygen generator, the working pressure is around 2.0MPa, and the moisture released from the compressed and cooled air can reach over 90% of the moisture content in the air. Therefore, it is necessary to regularly blow out to avoid increasing the burden of removing water from the dryer (purifier) and to avoid bringing water into the fractionator.
