POWER April 2013 - 60

MERCURY CONTROL
5. Cleaning up stack gas. CERI testwork on wet flue gas desulfurization (FGD) at the
Huaneng Beijing Cogeneration Power Plant (HBCP). The wet FGD system was supplied by a
third party. Courtesy: Hatch Consultants Inc.
7. Additive storage. This is the reagent
addition system at HBCP. Courtesy: Hatch
Consultants Inc.
6. Front-end treatment. The programmable logic control, instrumentation, and reagent dosing
silo for precombustion mercury control at HBCP are visible. Courtesy: Hatch Consultants Inc.
sorbent injection with a baghouse and wet
flue gas desulfurization.
■ D: Combined halogen and dry sorbent injection
with a baghouse and wet flue gas
desulfurization.
The selected upgrade route would primarily
depend on any existing installed
equipment. In this case, the use of SCRs
or cold/hot ESPs may partially enhance
mercury collection, but this equipment is
considered optional, as the impact would
be small and would not likely make a significant
difference in achieving the 90%
mercury reduction target.
A quick review of the table reveals a number
of important trends:
■ Circulating dry scrubber with baghouse.
■ Baghouse with wet flue gas desulfurization
(both systems).
■ Spray dryer absorber with baghouse
(both systems).
■ Selective catalytic reduction with a cold
electrostatic precipitator and wet flue gas
desulfurization (all three systems).
■ Selective catalytic reduction with a hot
electrostatic precipitator and wet flue gas
desulfurization (all three systems).
If the facility did not have any of the above
combinations of equipment, there would
only be one clear upgrade strategy, namely
to install upgrade option " A " -activated car60
bon
injection with a baghouse (one or two
upgrades, depending on whether the facility
already had a baghouse).
Conversely, a facility firing mediumsulfur,
medium- to low-chlorine lignite coal
would not be able to reliably achieve MATS
compliance with existing common gas-cleaning
equipment and would need to consider
one of four possible upgrade strategies:
■ A: Combined activated carbon and halogen
injection with a baghouse and spray
dryer absorber.
■ B: Combined activated carbon and halogen
injection with a circulating dry scrubber.
■ C: Combined activated carbon and dry
www.powermag.com
■ Coal type plays an extremely important
role in defining the available options for
mercury control. As we move from higher-
to lower-chlorine coals, the possibility
of achieving high collection efficiencies
with common (existing) gas cleaning
equipment soon dissipates. This is evident
by the absence of E options for these cases
in the table. Similarly, coals producing
lower carbon fly ash require more U options,
also evident in the table entries.
■ All else being equal, baghouses are better
suited for mercury capture than ESPs.
ESPs using SO3
as a flue gas-conditioning
agent (to meet stack opacity requirements)
are at a further disadvantage. ESPs are really
only relevant for mercury control with
certain high-chlorine coals, though even in
these cases, baghouse collection efficiencies
are still much higher.
■ The need for halogen injection to offset lowPOWER
| April 2013
http://www.powermag.com

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
POWER April 2013 - 5
POWER April 2013 - 6
POWER April 2013 - 7
POWER April 2013 - 8
POWER April 2013 - 9
POWER April 2013 - 10
POWER April 2013 - 11
POWER April 2013 - 12
POWER April 2013 - 13
POWER April 2013 - 14
POWER April 2013 - 15
POWER April 2013 - 16
POWER April 2013 - 17
POWER April 2013 - 18
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POWER April 2013 - 20
POWER April 2013 - 21
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POWER April 2013 - 23
POWER April 2013 - 24
POWER April 2013 - 25
POWER April 2013 - 26
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POWER April 2013 - 28
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POWER April 2013 - 31
POWER April 2013 - 32
POWER April 2013 - 33
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