Principle of the venturi scrubber

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This post discusses the principle of the venturi scrubber and how it differs from a steam jet pump. You can see the answer only by replying. Thank you for participating. A venturi tube consists of a converging section, a throat, and a diverging section. As the dusty gas enters the contraction section, its flow velocity increases, reaching a maximum value when it reaches the throat. The washing liquid is introduced at the contraction section or throat; the relative flow velocity between the gas and liquid phases is very high, causing the droplets to be atomized under the effect of the fast-moving gas stream. In a Venturi washer, the gas humidity reaches saturation, and the dust particles become moistened by the water. Intense collisions and agglomeration occur between dust particles and liquid droplets, or among dust particles themselves. In the diffusion section, the gas-liquid velocity decreases and the pressure rises, accelerating the coagulation process using dust particles as nuclei; this results in the formation of larger dust-containing droplets, which are then captured in the demister. There are various types of venturi tube configurations. Based on the cross-sectional shape, they are divided into circular and square types ； Based on the adjustability of the throat tube diameter, they are divided into adjustable and fixed types ； Based on the liquid atomization method, they can be divided into pre-atomized type and non-atomized type ； Based on the water supply method, it can be divided into four categories: radial inward spraying, radial outward spraying, axial spraying, and overflow water supply. It is suitable for removing dust particles with a particle size of 0.1–100 μm, featuring a dust removal efficiency of 80–99%. The pressure loss ranges from 1.0–9.0 kPa, while the liquid-to-gas ratio lies within the range of 0.3–1.5 L/m3. It has a good cooling effect on high-temperature gases, and is widely used for dust removal and temperature reduction of high-temperature flue gases; it can also be used as a gas absorber.