How to remove water in compressed air

To remove moisture from compressed air, the following measures can be taken:

1. primary filtration

primary filtration is performed before the compressed air enters the system, and primary filters are installed to filter out larger solid particles and liquid droplets. This step can be accomplished by using a screen or particulate filter.

2. cooling and condensation

the compressed air is cooled by a cooler to a temperature below the dew point, which condenses water vapor into liquid water, which is then removed using a condenser. This process is similar to the cooling of air in a condenser or cooler, and contacts the cooling medium in the condenser to condense water vapor.

3. desiccant adsorption

the remaining moisture is adsorbed using a desiccant. Adsorption dryers usually use silica gel or activated carbon as desiccant to achieve dehumidification by adsorbing moisture. When compressed air passes through the desiccant bed, moisture is adsorbed on the surface of the particles, thereby achieving drying.

4. separation and drainage

A moisture separator and automatic drainage device are provided to separate and drain liquid water from the compressed air. The moisture separator uses gravity separation or centrifugal force to separate liquid water from gas, and regularly removes the separated moisture through an automatic drain device.

5. other auxiliary measures

• regular inspection and maintenance: In order to ensure the normal operation of the compressed air system and efficient dehumidification, the filter, desiccant and drainage device should be checked, cleaned and replaced regularly.
• Rational design and operation of the system: Avoid potential moisture generation and accumulation, thereby improving the dehumidification effect.
• Environmental Control: Maintain air circulation in the air compressor room, and install air conditioners to reduce and dehumidify, especially in high temperature weather and high humidity environments.

6. Specific Equipment Selection

• gas tank: The gas storage tank itself has the functions of buffering, cooling and water removal, and only needs to be drained regularly.
• Freeze dryer (cold dryer): Quickly reduce the temperature of the compressed air and remove most of the moisture. Applicable to the gas quality requirements are not high or as a preliminary dehumidification equipment.
• Adsorption dryer (suction dryer): Use desiccant to absorb moisture to achieve a deeper dehumidification effect. It is suitable for occasions with high gas quality requirements.
• Precision filter: Further remove impurities such as moisture and oil in the compressed air to improve air quality.

To sum up, the removal of moisture in compressed air requires the comprehensive use of a variety of methods and equipment. According to the specific application scenarios and needs to choose the appropriate solution and equipment combination is the key.