Is it necessary to use the cold dryer on the air compressor?

Technical Description of Air Compressor Supporting Cold Dryer

in the compressed air system, the cold dryer is the key post-processing equipment, and its configuration necessity needs to be professionally evaluated in combination with specific application scenarios. The following specifications are made on the functional positioning and selection principles of the cold dryer:

the core role of 1. cold dryer
cold dryer through refrigeration technology to achieve the following functions:

1. moisture removal: Reduce the temperature of the compressed air below the pressure dew point, condense the water vapor into liquid water and discharge it, and ensure that the pressure dew point of the outlet air is stable in the range of 2-10 ℃
2. system Protection: Prevent the inner wall of the compressed air pipeline from rusting due to condensed water and prolong the service life of the pipeline system
3. process guarantee: Provide dry air source for pneumatic tools, spraying equipment and other terminal air units to avoid problems such as actuator sticking and seal failure caused by moisture.

Applicable scene of 2. cold drying machine
it is recommended to configure the cold dryer under the following working conditions:

1. precision machining field:
   • pneumatic chuck of CNC machine tool: prevent the workpiece clamping surface from rusting
   • the seventh axis of the robot: avoid the decrease of positioning accuracy caused by water accumulation in the guide rail
   • laser cutting auxiliary gas path: to prevent the lens fog affect the cutting quality
2. special Process Requirements:
   • electrostatic spraying operation: the water content of compressed air shall be controlled at 0.01 g/m & sup3;
   • food packaging production line: meet aseptic gas delivery standards
   • pharmaceutical industry: Comply with GMP requirements for compressed air cleanliness
3. environmental adaptation needs:
   • humidity> 80% of the hot and humid environment: natural condensation can not meet the requirements of drying
   • area with temperature difference between day and night> 15 ℃: prevent the accumulation of condensation water on the inner wall of the pipeline
   • compressed air delivery distance> 50 meters: reduce pipeline condensate generation

selection principle of 3. cold drying machine

1. processing Volume Matching: Select by 1.3 times the exhaust volume of the air compressor to ensure the processing capacity during peak gas consumption.
2. Pressure dew point setting: According to the requirements of terminal equipment, 3 ℃ dew point is selected for common working conditions, and -20 ℃ dew point is selected for precision processing.
3. Energy efficiency grade: Energy-saving products equipped with variable frequency drive are preferred, and the comprehensive energy efficiency ratio (CER) should be> 3.0

4. risk warning
if the cold dryer is not configured, it may cause:

• pneumatic component life shortened by 40%-60%
• pipeline system corrosion rate increased by more than 3 times
• product quality defects increased by 0.5-2%
• increase the risk of unplanned downtime, affecting the continuous operation of the production line

it is recommended that enterprises establish a compressed air quality monitoring system to implement online monitoring of compressed air pressure dew point, oil content, particle size and other parameters at key stations. For continuous operation of the system, can be configured double cold dryer redundant design, ensure the reliability of gas supply. In the equipment selection stage, professional compressed air system design should be carried out in combination with the technical requirements and environmental conditions of gas-using equipment.