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Flue gas conditioning for improved particle collection in electrostatic precipitators [electronic resource].

Published
Washington, D.C. : United States. Dept. of Energy, 1992.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
Pages: (16 pages) : digital, PDF file
Additional Creators
United States. Department of Energy and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
By injecting high concentrations of SO[sub 3] (80 to 100 ppM) it was possible to reduce the particle resistivity from 10[sup 11] to 10[sup 7] ohm-cm. However, it was very difficult to consistently obtain intermediate levels of resistivity. This was because of the steep relationships between gas phase SO[sub 3] and resistivity. It only takes a few ppM of SO[sub 3] to provide an order of magnitude change in resistivity. This is demonstrated by the curves in Figure 2. The water dew point for a gas stream with a moisture content of 10%, which is typical of coal fired boilers, is approximately 120[degrees]F. However, in a flue gas with only 2 ppM of SO[sub 3], sulfuric acid will begin to condense at 270[degrees]F. The effect of the rapid rise in acid dew point is reflected by the corresponding rapid decrease in resistivity. With no gas phase SO[sub 3] present the resistivity is in the high 10[sup 11] ohm-cm range. However with only 10 ppM of SO[sub 3], the resistivity drops three orders of magnitude. Therefore, intermediate levels of resistivity can only be obtained by controlling the SO[sub 3] concentration within 1 or 2 ppM.
Report Numbers
E 1.99:doe/pc/90364-t4
doe/pc/90364-t4
Subject(s)
Other Subject(s)
Note
Published through SciTech Connect.
10/14/1992.
"doe/pc/90364-t4"
"DE93008094"
Durham, M.D.
ADA Technologies, Inc., Englewood, CO (United States)
Funding Information
AC22-91PC90364
View MARC record | catkey: 14153443