Masters Theses

Date of Award

12-1996

Degree Type

Thesis

Degree Name

Master of Science

Major

Environmental Engineering

Major Professor

Wayne T. Davis

Committee Members

Terry Miller, James Smoot

Abstract

The primary objectives of this study were to characterize and quantify the particle collection efficiency of an ionizing wet scrubber (IWS). The system tested consisted of a cross-flow packed bed pre-scrubber, an ionizer, and a second cross-flow packed bed scrubber in series. The penetration of the system was studied as a function of particle diameter, gas flowrate, and packing media used in the scrubbers. Studies were conducted at gas flowrates of 500, 900 and 1100 ft3/min (specific collector areas of 62.6, 34.8 and 28.5 respectively), for particle diameters ranging from 0.118 - 5.0 microns. Three types of packing were studied. Three equations were developed as a function of specific collector area to describe the behavior of the IWS, which consists of an ionizer and a packed bed in series. The models have the following forms:

IWS: 62.6 SCA (For dp= 0.075 - 3.2μ: da=0.12 - 5.0μ)

Pt(62.6)IWS= exp [- (-0.48 dp2 + 3.07 dp + 2.02)]

X [0.006199 da3 - 0.060103 da2 + 0.011302 da + 0.77037](L/8)

IWS: 34.8 SCA (For dp= 0.075 - 3.2μ: da=0.12 - 5.0μ)

Pt(34.8)IWS = exp [- (-0.43 dp2 + 2.60 dp + 1.20)]

X [0.006199 da3 - 0.060103 da2 + 0.011302 da + 0.77037](L/8)

IWS: 28.5 SCA (For dp= 0.075 - 3.2μ: da=0.12 - 5.0μ)

Pt(28.5)IWS = exp [- (-0-66 dp2 + 2.93 dp + 0.74)]

X [0.006199 da3 - 0.060103 da2 + 0.011302 da + 0.77037](L/8) where Pt is the fractional penetration, dp is the physical diameter of the particle in microns, da is the aerodynamic diameter of the particle in microns, and L is the depth of wetted packing in the direction of gas flow in feet.

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