Scrubber Technology Compact gas scrubbers

Compact gas scrubbers are used to clean flue gas flows and are to be found in the most varied areas of industry.

Compact gas scrubbers are designed to absorb harmful substances, cool gases, condense vapors and separate dusts. In addition, chemical engineering processes can be carried out using compact gas scrubbers, e.g. the recovery of valuable materials and the manufacture of chemical products.


Compact gas scrubbers are exceptional among the gas scrubbers. They work according to the injection principle and they are the only scrubbers which produce no loss in pressure but rather an increase in pressure in the gas flow.

Therefore, in general terms, when using a compact gas scrubber, no mechanical ventilator is needed to extract and convey the gases. The scrubbing liquid acts as the motive medium, which will be sprayed by special designed nozzles in very fine droplets where gas cleaning takes place 

The gas/droplet mixture is separated in a centrifugal separator which is arranged downstream. The latter is designed in such a way that the formation of foam is largely avoided. The  droplets fall down into the liquid supply tank from where it is recycled by means of a submergible pump. 

In addition, the gas flows through a counter-flow scrubbing column arranged downstream which is provided with the scrubbing liquid from the circulation pump or with fresh scrubbing liquid if necessary. 

According to requirements, a packed column, a tray column or a structured packing column can be used. Entrained liquid droplets are separated in a demister arranged downstream before the gas outlet. In special cases the jet scrubber can also be equipped with a quench for cooling of hot gas. 

The solution or reaction heat which occurs during the scrubbing process can be discharged either through the continuous addition of fresh liquid with the corresponding liquid overflow or through the installation of a cooler in the form of a plate heat exchanger. 

The compact gas scrubber KGW is supplied in four standard sizes and two designs. Its modular construction lends itself to being easily extended and adapted to the given operating conditions.



  • Gas conveyance
  • Gas saturation and cooling
  • Hot gas quenching
  • Condensation
  • Separation of noxious substances (absorption)
  • Solid separation (de-dusting)


  • Broad range of application
  • Auto-suction, no pressure loss
  • Wide load range, efficient partial load
  • Easily combined and extended
  • Available in almost any material
  • Resistant to fouling
  • High reliability
  • Little maintenance