How to choose the best air aftertreatment system?

As we have already mentioned, compressed air can be processed from dirty, greasy, and humid to dry, clean, and oil-free air, many times cleaner than the ambient air we breathe. However, as air quality improves, so does the cost. This fee can take many forms:

  • Increased cost of capital equipment
  • Increased maintenance costs
  • Increased energy costs
  • DryerEnergy consumption (electric or in compressed air)
  • Pressure drop (requires the compressor to use more power to overcome the losses)

1. Determine the required air quality

To help facility engineers andOEMSpecify the compressed air quality of solid particles, humidity and oil, the International Organization for Standardization (ISO) has been formulatedISO 8573.1:2010. for air qualityXYZsaid, whereXis the particulate level,Yis the humidity (moisture) level,Zare oils, as shown in the table below.


If there are no specifications for installed equipment, some guidelines are as follows:



Typical manufacturing and carpentryIn the heating facility using pneumatic tools, cylinders, blow-moulding trade-offs andCNCMachines usually require liquid water to eliminate and reduce particulate and oil content (ISO 8573.1:2010Class2.4.2). This can be solved by using a refrigerated air dryer and a general purpose coalescing filter. 


Manufacturing in cold environments and unheated spaces A lower moisture dew point will be required to prevent moisture and line icing (ISO 8573.1:2010Level 2.2.2). This can be solved by a desiccant dryer with a coalescing pre-filter and a particle post-filter, or by a membrane dryer with a coalescing pre-filter if the demand is low.


Laser cutting of ferrous metals Low moisture and oil contents are often required (ISO 8573.1:2010Class 1.2.1). This requires a desiccant or membrane dryer with a particle filter, an ultrafine coalescing filter and a vapor filter.


laser cuttingCertain thicknesses of stainless steel It may be necessary to use nitrogen or other shielding gas instead of compressed air. This can be done by using a membrane nitrogen generator or pressure swing adsorption (PSA) Nitrogen generator is generated from compressed air.


 According to the Instrument Society of America (ISA1) Standard7.0.0.01-1996The instrument air requirement pressure dew point shall not be lower than the minimum temperature to which any part of the instrument air system is subjected in any season.18°FThe following. In no case shall more35°F.


The particle level is limited3Micron, and the oil content does not exceed one part per million (weight). This puts the instrument airISO 8573.1:2010 2Class .3.In most cases, a desiccant dryer with a coalescing prefilter and a particulate postfilter, or a membrane dryer with a coalescing prefilter is required.


In fully heated equipment, this requirement can almost pass.ISO 8573.1:2010 class 2to meet .

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