The converging section of a Venturi scrubber that accelerates gas flow to create high-velocity conditions for particulate and pollutant removal.
The converging section, also known as the inlet or throat entry, is a critical component of a Venturi scrubber designed to gradually reduce the cross-sectional area of the gas stream. This geometric constriction accelerates the gas to high velocities (typically 60-120 m/s), creating intense turbulence and shear forces that atomize the scrubbing liquid into fine droplets, enabling efficient impaction and absorption of particulate matter and gaseous pollutants.
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The optimal convergence angle is typically 15-20 degrees. Angles below 12 degrees cause insufficient acceleration, while angles above 25 degrees create excessive pressure drop and potential flow separation.
The converging section determines gas velocity, which directly impacts droplet atomization. Higher velocities create smaller droplets with greater surface area, improving particulate capture efficiency through enhanced inertial impaction.
For highly corrosive environments, 316L stainless steel, Hastelloy C-276, or FRP with chemical-resistant linings are recommended to prevent degradation from acidic or alkaline gas streams.
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