Gas jet scrubbers

Jet scrubbers

Jet scrubbers are used for the following basic processes :

Cooling – absorption – dedusting – conveying

The gas enters the jet scrubber from the side. The motive fluid acts as a scrubbing medium and direct current injects it to the gas and into the scrubber. The gas is accelerated due to the impulse exchange with the motive fluid. This results in conveying flow, enabling an increase in the gas pressure. Depending on the design of the plant, this rise in pressure means that the internal flow resistance of the plant and the resistance in adjacent pipes can be overcome. Therefore, the jet scrubber replaces a mechanical ventilator in many cases.

The level of power transmission manifests itself in a jet scrubber’s pressure gain. Because the scrubbing medium is sprayed through nozzles, the cylindrical section of the scrubber is filled with a full cone and reaches the large phase interface area between the gas and the liquid which is required for the basic operations.

Advantages of Körting jet scrubbers

  • Simple designs
  • Little maintenance required
  • High levels of reliability and availability
  • No fire risk in the scrubber
  • A combination of gas conveying with dedusting and absorption

A typical Körting jet scrubbing plant consists of:

  • Jet scrubber
  • Separation tank
  • Swirl droplet separator (DTA)

Applications :

The self-priming jet scrubber is superb for:

  • Conveying gas without mechanical ventilators
  • Direct gas cooling (quenching)
  • Physical and chemical absorption of harmful substances (SO2, Cl2, HCI, NH3, HF, H2S, etc.)
  • Removing dust with particles over 3 μm in size
  • Recovering substances from gases

Venturi scrubbers

Venturi scrubbers are mainly used for dedusting, The gas enters the scrubber from the side or from the top. In the same direction of flow as the gas, the liquid is injected into the scrubber through a single nozzle or an evenly spaced array of nozzles at the top. The combined flow is then massively accelerated because it’s directed through the steadily narrowing venturi throat. In contrast to the liquid drops, the gas and the dust particles quickly reach speeds of up to 150 m/s. Very high relative speeds between the gas and liquid occur.

The resulting shearing forces break up the liquid drops into tiny droplets. At the same time, due to their inertia the dust particles will no longer be able to follow the flow of the gas. They are hurled onto the droplets and separated out as a result. The energy that has to be transmitted in order to generate relative speeds manifests itself in the pressure consumption of the venturi scrubber. This is compensated for by a mechanical blower.

The venturi scrubber that doesn’t actively convey the dust is ideal for removing dust with particle sizes less than 3 μm.

Advantages of the Körting Venturi scrubbers

  • Their designs are simple and compact
  • Little maintenance is required
  • They offer high levels of reliability and availability
  • There is no fire risk in the scrubber
  • Investment costs are low and maintenance minimal

A typical Körting Venturi scrubbing plant consists of:

  • Venturi scrubber
  • Separation tank
  • Swirl droplet separator (DTA)

The venturi scrubber separates gas and dust particles. The purpose of the separation tank is to separate the scrubbed gas and the liquid phase and to act as a buffer before the scrubbing liquid is distributed.

The downstream swirl droplet separator is used to separate the fine droplets caught in the gas flow. Depending on the engineering requirements, further components can also be added.

Applications :

Wet operation enables separation of dust in the following cases:

  • Where the dust has critical characteristics, i.e. it’s hygroscopic, swells or is sticky, which rules dry separation in bag filters out
  • After drying systems
  • When it comes from steam systems with a hot condensate as scrubbing liquid
  • After firing processes (e.g. soot) where the hot flue gas is cooled at the same time
  • When it arises from filling mixing and agitating systems