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| Titel |
Mercury emission and speciation of coal-fired power plants in China |
| VerfasserIn |
S. X. Wang, L. Zhang, G. H. Li, Y. Wu, J. M. Hao, N. Pirrone, F. Sprovieri, M. P. Ancora |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 10, no. 3 ; Nr. 10, no. 3 (2010-02-03), S.1183-1192 |
| Datensatznummer |
250008037
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| Publikation (Nr.) |
 copernicus.org/acp-10-1183-2010.pdf |
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| Zusammenfassung |
| Comprehensive field measurements are needed to understand the mercury
emissions from Chinese power plants and to improve the accuracy of emission
inventories. Characterization of mercury emissions and their behavior were
measured in six typical coal-fired power plants in China. During the tests,
the flue gas was sampled simultaneously at inlet and outlet of Selective
Catalytic Reduction (SCR), electrostatic precipitators (ESP), and flue gas
desulfurization (FGD) using the Ontario Hydro Method (OHM). The pulverized
coal, bottom ash, fly ash and gypsum were also sampled in the field. Mercury
concentrations in coal burned in the measured power plants ranged from 17 to
385 μg/kg. The mercury mass balances for the six power plants varied
from 87 to 116% of the input coal mercury for the whole system. The total
mercury concentrations in the flue gas from boilers were at the range of
1.92–27.15 μg/m3, which were significantly related to the mercury
contents in burned coal. The mercury speciation in flue gas right after the
boiler is influenced by the contents of halogen, mercury, and ash in the
burned coal. The average mercury removal efficiencies of ESP, ESP plus wet
FGD, and ESP plus dry FGD-FF systems were 24%, 73% and 66%,
respectively, which were similar to the average removal efficiencies of
pollution control device systems in other countries such as US, Japan and
South Korea. The SCR system oxidized 16% elemental mercury and reduced
about 32% of total mercury. Elemental mercury, accounting for 66–94%
of total mercury, was the dominant species emitted to the atmosphere. The
mercury emission factor was also calculated for each power plant. |
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