POWER August 2010 - 59
MERCURY REMOVAL
must be considered. Typical questions that
make up the model input include these:
■ What is the overall system goal?
■ What are the fuels and fuel blends to be
considered?
■ What are the operating conditions and
other key performance requirements of
the SCR, such as NOx
reduction and SO2
conversion?
■ What level of mercury oxidation should be
expected through the air preheater?
■ Will the dust collection system contribute
to mercury reduction performance?
■ Will fuel or postcombustion additives be
utilized?
■ What collection efficiency should be expected
from the FGD system, including
consideration of re-emission control (conversion
back to elemental mercury)?
■ What are the economic considerations,
including, but not limited to, cost of additives,
cost of catalyst, pressure loss,
impact on ash sales, boiler corrosion, and
material-handling equipment?
Once requirements are understood, a series
of " what-if " scenarios can be run and
80
90
3. Mercury rising. Oxidized mercury levels increase with rising HCl concentrations in the flue
gas. Data were taken from a large utility boiler operating at full load with 12,000 operating hours on
the SCR. Source: Cormetech Inc.
Predicted
100
Actual (4-test avg.)
Individual tests
70
60
10
20
30
HCI(g) (ppmvd)
40
50
60
UDI World Electric
Power Plants Database -
The Original Global
Reference
Find cogen power plants in South
India, list new coal-fired projects
in Germany, track hydroelectric
projects in Brazil, and more ...
The Platts UDI World Electric Power Plants
Database (WEPP) is an inventory of generating
units covering plants of all sizes and
technologies operated by regulated utilities,
private power companies, and industrial
autoproducers (captive power).
This unique database is the largest global
power plant information resource available.
To purchase the UDI World Electric Power Plants Database, visit www.udidata.com or call your nearest Platts office.
North America
Europe/Middle East/Africa Latin America
1-800-PLATTS8 (toll-free) +44-20-7176-6111
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August 2010 | POWER
www.powermag.com
59
Outlet Hg+2 (%)
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POWER August 2010
Table of Contents for the Digital Edition of POWER August 2010
Contents
POWER August 2010 - Cover1
POWER August 2010 - Cover2
POWER August 2010 - Contents
POWER August 2010 - 2
POWER August 2010 - 3
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