POWER May 2010 - 118
emissions
7. Mercury removal performance with trona. Source: Solvay Chemicals Inc.
No trona With trona
100
90
80
70
60
50
40
30
20
10
0.0
5.0
trona was injected before the air preheater
and powdered activated carbon was injected
between the air preheater and ESP. Without
trona, no more than 80% of mercury was
removed even at very high PAC feed rates.
With trona injection at NSR = 0.1 based on
10.0
PAC injection rate (lb/mmacf)
the concentration of SO2
, high mercury removal
rates (>90%) were achieved even at
low PAC feedrates. The SO3
at SCR outlet
was around 3 ppm. After trona injection,
there was no measurable SO3
key to the high mercury removal.
, which was the
15.0
20.0
In addition to mitigating air pollutants,
sodium sorbents are able to improve the performance
of electrostatic precipitators, even
cold-side ESP units. Some flyash has higher
resistivity, which makes the capture of fine
particulate material difficult with electrostatic
precipitators. The injection of low-cost sodium
sorbent, such as trona, is able to lower
the resistivity of flyash and, consequently,
improve the performance of the ESP.
Intellectual Property
Solvay was awarded a patent for the use of
trona in a DSI to react with SO3
in certain
cases in March of this year. However, the
patent has been dropped and the technology
is now available to the public. This decision
was reached in cooperation with and the
full support of AEP, which was one of the
pioneers of using trona for SO3
mitigation.
Solvay feels very strongly that there should
be no encumbrances to the widespread use of
this technology. ■
-Dr. Yougen Kong, PE (yougen.kong@
solvay.com) is technical development
manager and Michael D. Wood (michael
.wood@solvay.com ) is senior business
manager for the SOLVAir Products Group,
Solvay Chemicals Inc.
Safety &
Professionalism
... are at the heart of everything we do.
We are a reliable & respected
full-service contractor to the
wind-energy industry.
Undeniable Professionalism
(Whether wearing our ties or not.)
circle 57 on reader service card
118
White_5010.indd 1
www.powermag.com
POWER | May 2010
4/14/10 2:53:42 PM
Offices in Indiana, Texas, and Ontario, Canada * www.whiteconstruction.com * 1-800-355-9401
ot.)
Hg removal rate (%)
Visit us at
Windpower2010
Booth # 8433
http://www.whiteconstruction.com
http://www.powermag.com
POWER May 2010
Table of Contents for the Digital Edition of POWER May 2010
Contents
POWER May 2010 - Cover1
POWER May 2010 - Cover2
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