Heatless Pressure swing Type

To reactivate the absorber, a portion of the product dry gas is depressurized and passed through. The feed gas pressure should be at least 7 kg/cm2g.

The amount of regeneration gas depends on the pressure and temperature of the supply gas. In order to avoid pressure shock , the absorber is pressurized before change over.

Salient features
  • Low capital cost
  • No heater required
  • Power is required for control purposes only
  • Ideally suitable for hazardous area
  • Desiccant does not experience thermal shock hence LONGER Life
  • Minimum maintenance as no heater, blower, or motor.

No Loss Purge Type

A part of the feed gas is heated and used for reactivation. After cooling and moisture separation, the reactivation gas is ultimately combined with the feed stream in a distributor before being fed into an absorber for adsorption.

Salient features
  • No blower.
  • No pressurization and depressurization.
  • No pressure difference across tour way valve.
  • No contamination from foreign gas.
  • No loss of dry Air.
  • Ideally suited for large capacity plant.

Open Loop Blower Type

While one absorber is kept under adsorption, the other is regenerated by passing hot air utilizing a blower through a heater and finally vented to the atmosphere. There is provision for pressurization and depressurization.

Salient features
  • Adsorbers can be kept regenerated before commissioning.
  • Adsorption is independent of regeneration.
  • No Joss of compressed air.

Closed Loop Blower Type

Operation of this system is similar to the open loop blower type except that reactivation is done through a cooler and moisture separator in a closed loop.

Salient features
  • No contamination from atmosphere.
  • Desiccant bed can be thoroughly cooled.
  • No appreciable change in quality of dry gas just after change over.

Product Purge Type

This method is exceptionally well suited for high pressures because only a small amount of product gas needs to be purged for reactivation. The saturated adsorber is depressurized for reactivation. A small quantity of dried gas is throttled, heated by means of a heater and passed through the adsorber.

For gases other than air, the purge gas can be recycled back to the suction of the compressor.

Salient features
  • No moving parts such as Blowers and motors.
  • Longer cycle time.
  • No contamination with foreign gases.
  • Due to depressurisation, regeneration can be done with nominal heating.