What Is A Venturi Scrubber?
A Venturi scrubber is a type of air treatment plant that uses a liquid (often water) to capture and remove pollutants from a gas stream. This device is characterized by a specific structure comprising three main sections before scrubbing step: a converging section, where the gas stream is initially introduced; a throat, which is the narrowest part of the scrubber, where the velocity of the gas stream increases and scrubbing liquid is introduced and a diverging section, where the gas stream slows down, allowing for more effective interaction between the liquid and the pollutants.
How does it work?
The working principle of a venturi scrubber involves several steps:
- The polluted gas stream first enters the converging section, where it starts to accelerate. As the gas stream passes through the throat, it reaches its maximum velocity. Here, the scrubbing liquid is introduced, either at the converging section or directly into the throat.
- The high velocity and turbulence in the throat cause the scrubbing liquid to atomise into small droplets, which increases the surface area for interaction between the droplets and the pollutants in the gas stream.
- In the diverging section, the velocity of the gas stream decreases, allowing for a longer residence time. This enhances the scrubbing process as the droplets capture more pollutants.
Finally, the cleaned gas is separated from the liquid in the scrubbing tower. A demister removes the liquid droplets entrapping the pollutants, allowing the clean gas to either proceed to the next process step or be released into the atmosphere.
Which problem can sort it out?
They are particularly good at removing fine particulates and soluble gases from industrial exhaust streams.
They can handle high-temperature and high-humidity gas streams, making them suitable for various industrial applications.
Venturi scrubbers are also effective in controlling emissions of hazardous substances and can be used in processes where gas streams contain high concentrations of pollutants.
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