PP 09 12 01 “Electrostatic Precipitators, Bag Filters and Emission Standards for Coal-fired Power Plants in China” by Wang Liqian, Zhang Dexuan and Yang Xiuyun, Chinese Society of Electrostatic Precipitation, Jiangsu Province, China. ICESP, 8 p.
From 1980 to 2003, installed power capacity in China grew from 65,869 MW to 384,500 MW. By the end of 2003, coal-fired power increased to 285,640 MW, thus increasing air pollution. Accompanying the emission standards from tolerant to stringent, higher efficiency ESPs gradually played a more dominant role. Since January 2004, when the new coal power emission standard of 50 mg/m3 was implemented, the choice between precipitator or fabric filter may be worth considering. A primary economic comparison is given.
IP 401 DRY ESP, IP 780 FABRIC FILTERS, IP 700 COSTS, IP 160 STANDARDS
The following four papers were presented at Air Quality VII, Arlington, VA, October 2009.
PP 09 12 02 “Dynawave/Membrane WESP — A Low Cost Technology for Reducing SO2, SO3, Hg+2 and Particulate from Coal-fired Power Plants” by John Caine, Southern Environmental, Inc., Pensacola, FL and Steven Meyer, MECS, Inc., Chesterfield, MO. 11 p.
Achieving reductions in multi-pollutant emissions within one device offers cost advantages, reduced space requirements, and less complexity. This paper documents the advantages of a DynaWave™/Membrane WESP system to capture SO2, SO3, Hg+2, and particulate for coal-fired boilers of 350 MW or less in size. The membrane WESP has the capability to cool the saturated gas stream, condensing water out of the gas stream which results in the unit requiring no make-up water. This allows the use of lower grade stainless steels for materials of construction. Combined in a skid mounted, modular package, these two proven technologies offer reliability, efficiency and demonstrated low maintenance.
IP 430 WET ESP, IP 576 SO3, IP 591 FGD SYSTEMS, IP 579 MULTIPOLLUTANT CONTROL, IP 589 MERCURY
PP 09 12 03 “Preliminary Results of the Full-Scale Field Trial of the Low Temperature Mercury Control (LTMC) Process” by James E. Locke and Richard A. Winschel, CONSOL Energy, Inc., South Park, PA and B. Andrew O’Palko, U.S. Dept. of Energy, National Energy Technology Laboratory, Morgantown, WV. 7 p.
This paper presents the initial experimental results from the full-scale evaluation of CONSOL Energy’s Low Temperature Mercury Control (LTMC) process. This technology reduces mercury and sulfur trioxide emissions from coal-fired power plants by cooling the exhaust gases to 220 to 240°F. This promotes the absorption of mercury on the coal flyash, which is then captured in the ESP. Magnesium hydroxide slurry can be injected to prevent corrosion, if necessary. The performance of the process is being evaluated at an 18 MW pulverized-coal-fired unit at the Jamestown, NY Board of Public Utilities’ Samuel A. Carlson Station with support from DOE National Energy Technology Laboratory.
IP 589 MERCURY, IP 539 COOLING SYSTEMS, IP 610 CORROSION, IP 207 TESTING
PP 09 12 04 “Mercury Oxidation SCR Catalyst for Power Plants Firing Low Chlorine Coals” by Peter Jin, Anthony C. Favale, William J. Gretta and Song Wu, Hitachi Power Systems America, Ltd., Basking Ridge, NJ and Yoshinori Nagai, Yasuyoshi Kato and Isato Morita, Babcock Hitachi, Kure-shi, Hiroshima-ken, Japan. 9 p.
Power plants that burn bituminous coals, which generally contain high amounts of Cl, have shown high mercury oxidation across the conventional SCR catalyst. However, the power plants burning low chlorine coals such as PRB, only limited or insignificant mercury oxidation has been observed. Therefore, it is essential to develop new SCR catalyst for low chlorine coal-fired boilers in order to achieve high mercury oxidation and high overall mercury removal. A new SCR catalyst TRAC™, has been developed by Hitachi to enhance mercury oxidation for low chlorine coal-fired boilers while still maintaining low SO2 to SO3 conversion. Hitachi conducted a slip stream reactor (SSR) test. It was demonstrated that more than 80 percent mercury oxidation was obtained in the SSR after one-year testing even as the chlorine concentration in flue gas was extremely low.
IP 589 MERCURY, IP 590 NOx REMOVAL, IP 352 OXIDATION, IP 207 TESTING
PP 09 12 05 “Field Investigations of Fixed-Bed Sorbents for Mercury Capture from Coal-fired Flue Gas” by Brandon Looney, Southern Company, Birmingham, AL, Tom Machalek and Carl Richardson, URS Corporation, Austin, TX, Ramsay Chang, Electric Power Research Institute, Palo Alto, CA, Randy Merritt, Randy Merritt Consulting, Birmingham, AL, Walter Piulle, Consultant, Redwood, City, CA and Pierina Fayish, DOE, National Energy Technology Laboratory, Pittsburgh, PA. 11 p.
The use of fixed-structure sorbents for mercury capture from coal-fired flue gas may offer several advantages over injection technologies related to sorbent utilization, byproduct contamination, and particulate emissions. EPRI’s MercScreen™ is a fixed-structure technology that uses a sorbent bed to remove flue gas mercury downstream of a primary particulate collector. MercScreen™ has demonstrated effective performance in a number of slipstream and pilot scale tests. Current work focuses on optimizing this process. This paper summarizes results of tests conducted at power plants firing bituminous and PRB coals. Tests have evaluated the impact of sorbent type and space velocity. Longer-term pilot tests have evaluated pressure drop behavior, particulate emissions, and the optimization of flow dynamics. The results of a preliminary economic analysis are also presented.
IP 589 MERCURY, IP 700 COSTS, IP 559 SORBENTS, IP 207 TESTING, IP 203 PILOT PLANTS