Dust-purification-techniques

 Venturi scrubber

Trough the high speed of gas and fluid the water falls apart into fine water drops. The venturi scrubber themselves have a small volume. The total dimension of the installation is especially stipulated by the demister, those sometimes can be than larger then a scrubber. Venturi scrubbers can be applied for removing small particles (< 1 µm) from the gas flow. They can be used however also for larger particles, although the energy usage is then relatively high. Even at very high pressure drop some dust types are not separable. Some venturi's have the advantage that the neck in average can vary and that this way the separator at a varying flow can be adapted to continue preserve a high efficiency.

The advantages of venturi scrubber are: 

• Relatively little maintenance

• High disposal efficiency

• Simple and compact construction

• No mechanical components

• Gaseous components are absorbed

• Insensitively for fluctuating gas flows

• Require no aerator

The disadvantages are:

• Large pressure drops

• Erosion phenomenon at scrubbing of abrasive medium

The venturi scrubber are also used as a cooler for hot degasses (to 1,000 °C) at "quenching".
Venturi scrubber are applied on all kinds of places, among other things in:

• The chemical industry for the removal of dust and aerosols

• The metallurgy for several types of degasses

• Waste combustion installations

• Gasification processes

• Potato industry for the disposal of starch

• Glass industry

• Melting processes in the metallurgy

• Foundries

• Sinter processes

• Dust processes

• Manure production

• pharmaceutical industry

• Plastic industry

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