FGD
and DeNOx
NEWSLETTER
July 2015
No. 447
Mercury Hot Topic Hour February 26 Explores Ways to Optimize Performance
The speakers in the Hot Topic Hour on February 26 and the one scheduled for
next week are demonstrating the large amount of knowledge that the U.S. has
gained as the leader in mercury reduction. There are still many issues and
therefore many options. Bob McIlvaine started the meeting by pointing out
areas which are under scrutiny.
CEMS versus sorbent traps
Carbon versus non carbon sorbents
Iodine
versus bromine versus chlorine
Additives impact on mercury and particulate capture
Mercury modules, e.g., Gore, Haldor Topsoe, BASF
Hydrochloric acid pre-scrubber to capture both mercury and rare earths
and start the leaching process
Mercury capture at 850°F
Sampling train reliability and maintenance considerations
Flyash salablility
This is just some of many issues with lots of options.
Mercury Hot Topic Hour Overview by Bob McIlvaine - Hot Topic Hour
February 26, 2015
Overview of conveying, corrosion, measurement and sorbents for removing
mercury.
Revision Date:
2/27/2015
Tags:
221112 - Fossil Fuel
化石燃料,
Mercury
Sheila Glesmann, Senior Vice President, Environmental and External Affairs,
ADA-CS provided an overview of mercury control options along with
some insights relative to the operation of activated carbon systems. Some of
the operational practices which should be utilized include
Align Injection Manifold/Lances during operation
Initial
silo fill of one truckload to identify leaks or other construction
defects
PAC flows readily and is low in density
All connections, doors, and flanges must be sealed
Add water line to the exterior top of the silo for cleaning
Lances can plug when not in operation — clear lances
High
carbon injection rates may require additional weigh hopper venting
Additional fluidization capability in the silo can improve flow
Sheila also discussed the market. She cited a recent Institute of Clean Air Companies survey which confirmed 181 GW of Hg control installations.
This includes only ICAC members and not all members responded.
Represents about 60 percent of coal-fired power plants; potentially
about 70% of those that will be operating post-MATS (assume 50-70 GW
retirements).
Technologies reported are
Activated Carbon Injection (ACI) 310 units; 137 GW
Wet Flue Gas Desulfurization additives 67 units; 32 GW
Upstream oxidation additives 61 units; 30 GW (combined w/ACI 12 units;
w/WFGD 31 units)
Non-carbon sorbents 3 units; 1.6 GW
Sheila provided an overview of mercury control options along with some
insights relative to the operation of activated carbon systems.
Revision Date:
2/27/2015
Tags:
221112 - Fossil Fuel
化石燃料,
ADA Carbon Solutions, Activated Carbon, Mercury
Steve Feeney, Mgr./Nat'l. Sales/Aftermarkets, Babcock & Wilcox Power
Generating Group described a program whereby B&W can supply an inorganic
sulfide for economic prevention of re-emission. The various chemicals
available range by almost an order of magnitude in price.
Steve described a program whereby B&W can supply an inorganic sulfide for
economic prevention of re-emission.
Revision Date:
2/27/2015
Tags:
221112 - Fossil Fuel
化石燃料,
Babcock & Wilcox Power Generation Group, Mercury, Re-Emission, Sulfide
Jeff Doherty, President, Semi-Bulk Systems, Inc. described the
injection system using a
venturi
ejector principle to introduce the PAC to the recirculating scrubber slurry.
This system is also widely used to introduce powdered limestone to the
scrubber system. In the U.S. some power plants have elected to purchase
powdered limestone rather than invest in ball mills. This practice is much
more common in China where Semi-Bulk has a number of installations.
Jeff described the injection system using a venturi ejector principle to
introduce the PAC to the recirculating scrubber slurry.
Revision Date:
2/27/2015
Tags:
221112 - Fossil Fuel
化石燃料,
Semi-Bulk Systems, Activated Carbon, Mercury, Limestone
Jeremy Whorton, P.E., CEMS Product Manager-Americas, Air Quality
Instruments,
Thermo
Fisher Scientific,
explained why power plants should consider a process mercury CEMS as well as
one for compliance. The process CEMS is built for mobility and can be used
to measure emissions at any point in the system. Features include:
Lower Cost than a Compliance System
FAST Continuous Readout
Feedback
Control
Less QA/QC
Lower
O&M
Short Return on Investment
Commonality of components for Thermo Scientific
Freedom Hg CEMS for MATS Compliance
Thermo also sells equipment to measure the mercury content in coal,
limestone, etc. So a power plant has the ability to analyze fuels and
optimize operations based on the minimal reagent, fuel and other costs.
Jeremy explained why power plants should consider a process mercury CEMS as
well as one for compliance.
Revision Date:
2/27/2015
Tags:
221112 - Fossil Fuel
化石燃料,
Thermo Fisher Scientific, Continuous Emissions Monitor, Mercury
The entire February 26 recording can be heard at
Mercury Measurement and Capture
– 106 minutes
You will need to enter your name and email address after clicking
link to view recording.
Mercury Measurement & Capture Webinar - Hot Topic Hour February 26, 2015
Discussion of conveying, corrosion, measurement and sorbents for removing
mercury.
Revision Date:
2/27/2015
Tags:
221112 - Fossil Fuel
化石燃料,
Thermo Fisher Scientific, Activated Carbon, Continuous Emissions Monitor,
Mercury, Re-Emission, Sulfide, Limestone
Back to FGD and DeNOx Newsletter No. 447 Table of Contents