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Air quality standards in compressed air treatment

Did you know that more and more companies have now recognized and identified the growing need for dry and treated compressed air ?

Contact us for air treatment solutions

March 16, 2020

Estimated reading time: 5 minutes

The current market trend in compressed air treatment is moving away from traditional installations (otherwise limited to installing a fabricated pre and a post-filter with a refrigeration dryer).

Now users becoming more aware of application needs and ISO purity classes governing the user applications whether within the compressor room or outside of the compressor room (i.e. close to point of use or user application point).

Drying Technologies

The two predominant drying technologies include moisture separation using refrigeration technology (for low dew point needs +3 to +10 deg C PDP) and pressure swing adsorption technology using a desiccant bed ( for even lower dew point ranging from -20 deg C PDP to -70 deg C PDP).

The choice of technology depends on user requirements and application criticality.

Parameters

Refrigeration Drying

Desiccant Drying

Achievable pressure Dew point

+3 to +10 deg C pdp

-20 to -70 deg C pdp

Moisture presence

Comparatively higher

Relatively lower

System complexity

Low

Medium/ High

Service intensity

Very Low

Low

Water vapour sensitivity

No liquid water

No liquid water

Oil sensitivity

Not a factor

Not allowed (< 0,01mg/m³)

Noise level

Very low

High (blow-off peaks)

Weight

Low

Medium (bulky construction)

Pressure drop

Low

Relatively high(needs pre filtration)

Losses

Low

Medium/ High (purge & zero purge systems)

Power consumption

Low

Low/ Medium

Impact of changing Temp/ Press

High

Low/ Medium

Likewise filtration otherwise believed to work on principle of sieving (wherein the filter media acts as a sieve) is now understood well and correct synergies for different particle needs have been identified by the market with the re-defining of contaminants of different sizes and their removal using below 3 principles which act simultaneously and provide for quality filtered air.

  • Impaction: big particles
  • Interception: mid-size particles
  • Diffusion: small particles

Types of contaminants and recommended technology

S.no.

Contaminants

Technology

1

Dry Dust

Dry Dust Filter

2

Wet Dust

Coalescing Filter

3

Liquid

Water Separator/ Aftercooler

4

Vapour (Humidity)

Dryers (Refrigerant, Desiccant or Membrane

5

Liquid (Aerosol)

Coalescing Filter

6

Vapour (Hydrocarbon)

Oil Vapour Filter / Activated Carbon Tower

The opportunity these new advancements present to customers include:

  • Reducing quality costs
  • Reduced rework
  • No equipment damage
  • No contamination of end product
  • No System contamination
  • Low Maintenance costs
  • No Product Spoilage
  • High Reliability
  • Improved Energy efficiency 
  • High production efficiency
  • High Profitability

Watch this video to know more about filtration principles

What are the benefits of the treated compressed air ?

The benefits of the treated (dried and filtered) compressed air are two folds:
  • No water vapor thus ensuring prevention from corrosion of downstream equipment and thus no pipe rust & scaling
  • No dust particles & oil vapors/droplets preventing contamination and thus, no equipment/ product spoilage. 

These inherent benefits of air treatment products make it useful for many industrial applications.

Click here to read more on air treatment and ask for air expert for the best solution for your industry.