Venturi Wet Dust Scrubbers

Nederman MikroPul venturi scrubbers are valuable in processes needing high particulate removal efficiency, high inlet gas temperatures, high particle loading and high percentage of solids in the liquid recirculation loop. These flexible designs are well matched to solving problems in mining, chemical, food, explosive dust and metallurgical applications.

Venturi Scrubbers can operate with efficiencies of 99%+ for sub-micron particles, with minimal maintenance and long operating life.

Multi-Venturi Scrubbers are also available with special features to address applications where the user desires high performance at low pressure drops, adjustability of the venturi rod deck or compact, low profile design to suit available space. Additionally, these designs are self-draining and do not require water level control.

Our experienced engineers will design a venturi scrubber to suit your specific application. The two basic design are:

Venturi Wet Scrubber

The design of the MikroPul Venturi Scrubber consists of a “wet approach” venturi followed by a liquid entrainment separator. Dust-laden gases enter the venturi and instantly make contact with the tangentially introduced scrubbing liquid swirling down the venturi’s converging walls.

At the venturi throat, the gas and liquid streams collide and the liquid breaks down into droplets which trap dust particles. This gas/liquid mixture passes through a flooded elbow, and then enters the entrainment separator through a tangential inlet. Centrifugal action removes the heavy wetted particles from the gas stream. Alternatively, when very large diameter separators are required, the liquid is separated by passing the stream through a chevron-type mist eliminator baffle.

The dust/liquid mixture is discharged from the separator bottom drain and the cleaned gas leaves through the top of the separator.

This design has minimum maintenance since it utilizes open pipe liquid inlets, and no spray nozzles are required.

What is a Venturi Scrubber and how does it work?

Multi-Stage Venturi Wet Scrubber

The multi-stage venturi wet scrubber is for applications where one stage of wet scrubbing is not enough to completely remove the particular dirty gas particles from the air flow.

Multi-Venturi Wet Scrubber

This scrubber makes use of a venturi-rod deck consisting of a series of rods arranged to create a venturi effect between each rod. It offers higher efficiencies at lower pressure drops and liquid to gas ratios than conventional venturi scrubbers.

Dust laden gases are directed through the venturi-rod deck where atomized scrub water is introduced co-currently with the gas stream. The scrub water is sprayed through a series of low pressure, large orifice nozzles, distributing it evenly across the deck. The gas rapidly accelerates as it passes through the venturi-rods. This action creates smaller droplets, causing encapsulation of the particles and increasing the collection efficiency of submicron particles.

As the gases exit the venturi-rod area, velocity slows causing the larger particle-laden droplets to fall out of the stream. The scrubbed gasses are then directed toward a two-stage demisting zone by distribution baffles or turning vanes. Primary demisting and gas distribution occurs in the pre-demist area, which removes 90% of the water. The remaining free water droplets are removed by impingement on the final stage demist vanes. The scrub water collected prior to the demist section flows down the scrubber floor to the drain trough. Dewatered scrubbed gases are exhausted via the scrubber outlet.

This design utilizes rod-deck design that is easy to maintain.