INTEGRATED SYSTEM TO CONTROL PRIMARY PM 2.5 FROM ELECTRIC POWER PLANTS Page: 4 of 14
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The first step in being able to use the P5A data to estimate the concentration of
particles in the clean flow outlet is to run simultaneous P5A and Method 5 tests. Figure
5 shows the Method 5 results plotted as a function of the P5A output voltage. The data
from the first two test days show an excellent straight-line correlation with an R2 value of
over 0.99. The data from the final three days shows poor correlation. The most
significant difference in the operation of unit over the two time periods is that electrodes
in the separator were energized during all tests in the last three days but energized only
during one test during the first two days. It is supposed that energization of the
electrodes in the separator encourages particle agglomeration by the phenomenon
known as the "pith ball effect" described in Electrostatic Precipitation by Oglesby and
For the purposes of analysis, the correlation from the first two days was used to
correlate the P5A output to the EPA Method 5 results. This causes the P5A determined
efficiency to be greater than the Method 5 efficiency for those tests where the Advanced
ElectroCore electrode is energized. It represents an estimate of the efficiency if the
agglomeration process could be controlled or eliminated.
Figure 6 and Figure 7 show examples of the P5A output traces. Figure 6 shows the
trace for Test 2, which had the lowest outlet emission of all tests conducted and Figure
7 shows the trace for Test 4 which had the highest outlet loading. The first trace shows
a consistently low output level with only eight significant spikes, all but one of short
duration. The middle spike correlates to the midpoint of the Method 5 test where the
probes are taken out and inserted into the sampling port 90 degrees away. The second
trace shows the output is very unsteady with many peaks saturating the P5A output.
Observations during the test indicated that the plant was having combustion problems
as indicated by periodic puffs coming from the Unit 4 stack.
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INTEGRATED SYSTEM TO CONTROL PRIMARY PM 2.5 FROM ELECTRIC POWER PLANTS, report, December 1, 2001; Pittsburgh, Pennsylvania. (digital.library.unt.edu/ark:/67531/metadc743169/m1/4/: accessed July 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.