POWER April 2013 - 40

EMISSIONS CONTROL
4. Coal ash collecting. ESP collection efficiency versus specific collecting area (SCA) for
various coals in illustrated. Source: K.S. Kumar and P.L. Feldman, Beyond NSPS: Electrostatic
Precipitator and Fabric Filter Technologies to Meet Future Emission Control Requirements, 9th
Symposium on Transfer & Utilization of Particulate Control Technology, October 1991.
99.98
99.97
99.95
99.92
99.90
99.85
99.8
99.7
99.6
99.4
99.0
98.0
should be expected. Also, stack filterable
emissions after the wet FGD will be influenced
by the degree of re-entrainment
of scrubber-generated gypsum particulate
from the mist eliminators located at the
wet FGD outlet.
95.0
90.0
85.0
80.0
200
300
400
500
600 700 800 9001000
SO3 Makes a Contribution
ESP filterable outlet emissions data can
vary widely, even for a seemingly consistent
level of electrical energization. However,
the contribution of artifacts from
measurement emissions test methods can
introduce considerable positive bias to a
true filterable emission value. Figure 3,
showing sulfuric acid dew point curves,
highlights this phenomenon. EPA Test
Methods 5 and 17 (other than Method 5B),
generally stipulated for unscrubbed units,
require the filter probe temperature to be at
250F or at the stack temperature, respectively.
For units operating with a wet FGD
system ahead of the stack, EPA Method 5B
is typically specified.
For an ESP operating at an outlet temperature
of 325F and a typical concentration
of 10 ppm SO3
at a flue gas moisture
level of 10%, the sulfuric acid dew point
can be estimated from Figure 3 to be 277F.
If you need information on the global power
generation industry, look to
first.
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40
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POWER | April 2013
Efficiency (%)
Eastern high sulfur
Eastern low sulfur with SO3 gas conditioning
Eastern 1% sulfur or western low sulfur, medium sodium
0.8% - 1.5% Na2O in ash
Western low sulfur, low NO
<0.5% Na2O

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POWER April 2013

Table of Contents for the Digital Edition of POWER April 2013

Contents
POWER April 2013 - Cover1
POWER April 2013 - Cover2
POWER April 2013 - Contents
POWER April 2013 - 2
POWER April 2013 - 3
POWER April 2013 - 4
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POWER April 2013 - Cover3
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