Rotary washer

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A rotary washer is a device for the exchange of substances between flowing gases and liquids. In the case of rotary washers, a distinction is made between rotary atomizers and disintegrators. In both versions, the energy input to generate the drops is carried out by rotating mechanical elements. They are used for exhaust gas cleaning.

functionality

Rotary atomizer

In the case of the rotary atomizer, the washing liquid is removed from rotating components, such as B. rotating letters or atomizer wheels atomized. This creates a veil of droplets between the device wall and the atomizer device. When crossing this veil, the particles contained in the gas are absorbed by the liquid and transported to the wall of the apparatus by centrifugal force . The advantages of the rotary atomizer are a low pressure loss , a wide power range and the possibility of loading the washing liquid to a high level. This is offset by a complex construction. The energy requirement for driving the atomizer device can also be considerable.

Disintegrator

The disintegrator has concentrically arranged internals in a spiral housing, some of which rotate (rotor cages) and some of which are stationary (stator cages). The washing liquid is introduced into the disintegrator via an injection tube. Gas and scrubbing liquid pass alternately through rotor and stator baskets in direct current. The rotational movement of the rotor baskets causes constant changes of direction with temporarily high relative speeds and constant renewal of the washing liquid contact surface. A pressure gain can be achieved using a disintegrator.

Similarities between rotary atomizers and disintegrators

Rotary washers usually have a compact design. Since both the speed and the washing liquid flow can be set separately from one another, they can be used in broad ranges of the gas throughput and the dust load due to their influence on the droplet size distribution. Another advantage is that intensive mixing and separation of gas and absorbent takes place in each stage. On the other hand, there is an increased energy requirement.

commitment

Rotary scrubbers are generally used for the joint separation of gaseous and particulate contaminants. They can also be used for oxidizing gas scrubbing .

literature

Individual evidence

  1. ↑ Tilman Schultz, Edgar Muschelknautz: Separation capacity and energy requirements of the rotary scrubber for exhaust gas dedusting . In: Chemical Engineer Technology . 63, No. 8, 1991, ISSN  0009-286X , pp. 856-857.
  2. ↑ Klaus Holzer: Experience with wet-working dust collectors in the chemical industry. In: Dust - cleanliness. Air . 34, No. 10, 1974, ISSN  0949-8036 , pp. 361-365.
  3. ↑ Klaus Holzer: Aerosol separation from flue gases from plants for the incineration of hazardous waste. In: Dust - cleanliness. Air. 48, No. 5, 1988, ISSN  0949-8036 , pp. 203-208.
  4. ↑ Matthias Stieß: Mechanical Process Engineering 2 . Springer, Berlin / Heidelberg / New York 1994, ISBN 3-540-55852-7 , p. 35.
  5. ↑ Ekkehard Weber, Manfred Schütz: Absorption apparatus . In: Dust - cleanliness. Air . 36, No. 8, 1976, ISSN  0949-8036 , pp. 340-348.
  6. ↑ VDI 3679 sheet 1: 2014-07 wet separator; Basics, exhaust gas cleaning of particulate substances. Beuth, Berlin, p. 37.
  7. ↑ VDI 3679 sheet 4: 2014-10 wet separator; Flue gas cleaning through oxidizing gas scrubbing. Beuth, Berlin, p. 9.