STUDY ON MULTI-METHOD MERCURY SPECIATION IN LIGNITE-FIRED POWER PLANTS
Introduction Mercury emission is a global air pollution problem attracts more and more attentions world-wide. Coal-fired electric utility boilers have been reported as the largest anthropogenic mercury emissions,contributing about one third of total anthropogenic mercury emissions 1-3. The US EPA has set the final regulation on mercury emission from coal-fired power generation on March 15, 2005 4. As specified in the rule, the mercury emission from utility boilers will be reduced to a final cap at 15 ton/year in 2018. During combustion, mercury (Hg) in coal is volatilized and converted to elemental mercury (Hg0) vapor in the high temperature regions of coal-fired boilers. As the flue gas is cooled, a series of complex reactions begin to convert Hg0 to oxidized mercury (Hg2+)compounds and/or Hg compounds (HgP) that are in a solid-phase at flue gas cleaning temperatures or Hg that is adsorbed onto the surface of other particles. This partitioning of Hg into Hg0, Hg2+, and HgP has considerable influence on selection of mercury control and measuring methods 5. Mercury emission for coal-fired boilers can be improved by fuel blending, conventional air pollution control device (APCD)operating conditions, etc. In this paper, Mercury concentration and speciation partitioning, including total HgP, Hg0, and Hg2+from two lignite-fired power plants under different operating conditions, was studied by Ontario Hydro method (OHM), Hg semi-continuous emission monitors (SCEM), continuous mercury monitor (CMM) and sorbent trap method (Appendix K). The effects of boiler load, fuel blending ratio, ESP, FGD, flue gas bypassing the FGD ratio, etc. On the mercury emission were analyzed.
Ping Lu Jiang Wu Wei-ping Pan
School of Power Engineering Nanjing Normal University, Nanjing 210042, China School of Energy and Environmental Engineering, Shanghai University of Electric Power, Shanghai 2000 ICSET, Western Kentucky University, Bowling Green, KY42101,USA
国际会议
The 7th China-Korea Workshop on Clean Energy Technology(第七届中韩清洁能源技术研讨会)
太原
英文
29-30
2008-06-25（万方平台首次上网日期，不代表论文的发表时间）