Design and Application of Wet Scrubbers

Authored by: Karl B. Schnelle , Russell F. Dunn , Mary Ellen Ternes

Air Pollution Control Technology Handbook

Print publication date:  October  2015
Online publication date:  October  2015

Print ISBN: 9781482245608
eBook ISBN: 9781482245622
Adobe ISBN:

10.1201/b19286-23

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Abstract

In wet scrubbing, an atomized liquid, usually water, is used to capture particulate dust or to increase the size of aerosols. Increasing size facilitates separation of the particulate from the carrier gas. Wet scrubbing can effectively remove fine particles in the range from 0.1 to 20 µm. The particles may be caught first by the liquid, or first on the scrubber structure, and then washed off by the liquid. Because most conventional scrubbers depend upon some form of inertial collection of particulates as the primary mechanism of capture, scrubbers when used in a conventional way have a limited capacity for controlling fine particulates. Unfortunately, inertial forces become insignificantly small as particle size decreases, and collection efficiency decreases rapidly as particle size decreases. As a result, it becomes necessary to greatly increase the energy input to a wet scrubber to significantly improve the efficiency of collection of fine particles. Even with great energy inputs, wet scrubber collection efficiencies are not high with particles less than 1.0 µm in size.

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