POWER July 2014 - 25

ENVIRONMENTAL CONCERNS
4. HCl captured in ESP. In addition to very high SO3 removal, SBS Injection can achieve
significant co-removal of hydrochloric acid (HCl), thereby reducing levels in the downstream flue
gas desulfurization system and wastewater streams. Source: URS Corp.
75
70
65
60
55
50
45
40
35
30
1.25
1.50
1.75
FGD wastewater streams can be met without
the need for additional treatment.
HCl and Selenium Co-Removal
As mentioned earlier, HCl emissions in flue gas
and selenium discharges in wastewater are also
2.00
2.25
SBS Injection molar ratio (Na2CO3:SO3)
regulated by MATS and proposed ELG rules,
respectively. Recent testing has shown that
sorbent injection for the removal of SO3 and
mercury is also effective for the capture and removal
of HCl and selenium from flue gas.
HCl removal results as a function of the
2.50
2.75
SBS sorbent injection rate are illustrated in
Figure 4. At typical SBS sorbent injection
rates, roughly 40% HCl capture was achieved,
while elevated injection rates resulted in
nearly 70% HCl capture. These results are
consistent with previous testing that shows
that SO3 is preferentially removed, with excess
sorbent available to remove HCl present
in the flue gas. However, results at a given
plant will vary depending on the relative concentrations
of SO3 and HCl in the flue gas,
and the overall sorbent injection rate.
Co-removal of HCl with the fly ash can provide
several advantages to the operating plant.
Some plants must control the dissolved chloride
levels in their wet scrubbers due to materials
of construction and corresponding corrosion
concerns. As a result, many plants must operate
with a chloride purge stream from the FGD system.
In most cases, this chloride purge stream
must be treated prior to discharge.
In addition, the newly proposed ELG rules
may require additional treatment to meet new
stringent limits for mercury and selenium. By
capturing HCl in the fly ash, and reducing the
amount captured in the FGD system, it may
be possible to greatly reduce, or even eliminate,
the need for a chloride purge stream.
As a result, it may be possible to avoid the
CIRCLE 13 ON READER SERVICE CARD
July 2014 | POWER
www.powermag.com
25
Chloride removal across ESP (% of coal Cl)

http://www.powermag.com

POWER July 2014

Table of Contents for the Digital Edition of POWER July 2014

Contents
POWER July 2014 - Cover1
POWER July 2014 - Cover2
POWER July 2014 - Contents
POWER July 2014 - 2
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