Jet scrubber

from Wikipedia, the free encyclopedia

A jet scrubber or injector is a device for mass transfer and heat transfer between flowing gases and liquids. Jet scrubbers are used in particular for exhaust gas cleaning.

functionality

Jet scrubbers work on the principle of the water jet pump. Washing liquid is introduced into the gas to be treated through a nozzle at an overpressure of 1500  hPa to 7000 hPa, which entrains it in cocurrent and the liquid jet breaks up into drops. The water speed is up to 35 m / s , the gas speed is  usually between 5 m / s and 15 m / s. In the two-phase flow that forms , the driving forces for mass transfer are high at the beginning, but lower over the entire mass transfer process than comparable countercurrent processes.

Jet scrubbers do not generate any additional pressure loss. The energy input takes place via the washing liquid.

Due to turbulence , a large part of the liquid droplets is deposited on the scrubber wall. The remaining drops are to be removed from the gas flow using a drop separator . The washing liquid is usually reused by recycling.

commitment

Jet scrubbers are often connected in series or combined with other devices. Since the ratio of liquid to gas in jet scrubbers is comparatively high, they are preferred for chemisorption processes in order to dissipate the heat released by chemical reactions. The oxidizing scrubbing of exhaust gases containing elemental halogens is also often carried out with the help of jet scrubbers. For particle separation, jet scrubbers are suitable for particle sizes of 1  µm and larger.

literature

  • VDI 3679 Part 1: 2014-07 wet separator; Basics, waste gas cleaning of particulate matter (wet separators; Fundamentals, waste gas cleaning of particle collections). Beuth Verlag, Berlin. ( Summary online , table of contents )

Individual evidence

  1. ↑ VDI 3679 sheet 1: 2014-07 wet separator; Basics, waste gas cleaning of particulate matter (wet separators; Fundamentals, waste gas cleaning of particle collections). Beuth Verlag, Berlin. P. 33.
  2. ↑ a b c Matthias Stieß: Mechanical Process Engineering 2 . Springer-Verlag Berlin, Heidelberg, New York 1994, ISBN 3-540-55852-7 , p. 35.
  3. ^ A b Gabi Förtsch, Heinz Meinholz: Manual of operational pollution control . Springer Spectrum, Heidelberg 2013, ISBN 978-3-658-00005-9 , p. 214.
  4. ↑ a b Harald Menig: Air pollution control through adsorption, absorption and oxidation . Deutscher Fachschriften-Verlag, Wiesbaden 1977, ISBN 3-8078-8056-9 , pp. 257-258.
  5. ↑ VDI 3679 sheet 1: 2014-07 wet separator; Basics, waste gas cleaning of particulate matter (wet separators; Fundamentals, waste gas cleaning of particle collections). Beuth Verlag, Berlin. P. 34.
  6. ↑ VDI 3679 sheet 2: 2014-07 wet separator; Exhaust gas purification by absorption (scrubber) (Wet separator; Waste gas cleaning by absorption (scrubbers)). Beuth Verlag, Berlin. P. 35.
  7. ↑ VDI 3679 sheet 4: 2014-10 wet separator; Waste gas cleaning by oxidative gas scrubbing (wet separators). Beuth Verlag, Berlin. P. 13.