Effect of selective catalytic reactor on oxidation and enhanced removal of mercury in coal-fired power plants

The present study investigated the variation of mercury (Hg) speciation within the air pollution control devices (APCDs) in bituminous coal-fired power plants. The effect of selective catalytic reduction (SCR) system, which is mainly installed for NO x removal, on elemental Hg (Hg 0) oxidation and e...

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Bibliographic Details
Published in:Fuel (Guildford) 2010-04, Vol.89 (4), p.804-809
Main Authors: Pudasainee, Deepak, Lee, Sung Jun, Lee, Sang-Hyeob, Kim, Jeong-Hun, Jang, Ha-Na, Cho, Sung-Jin, Seo, Yong-Chil
Format: Article
Language:English
Subjects:
Air pollution
Air pollution caused by fuel industries
Applied sciences
Coal combustion
Electric power generation
Electric power plants
Energy
Energy. Thermal use of fuels
Exact sciences and technology
Flue gas
Flues
Mercury
Mercury partitioning
Mercury reemission in wet FGD
Oxidation
Partitioning
Pollution reduction
SCR
Speciation
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Summary:The present study investigated the variation of mercury (Hg) speciation within the air pollution control devices (APCDs) in bituminous coal-fired power plants. The effect of selective catalytic reduction (SCR) system, which is mainly installed for NO x removal, on elemental Hg (Hg 0) oxidation and enhancement of Hg removal within APCDs, was studied. Hg speciations in flue gas at the inlet and outlet of each APCDs, such as SCR, cold-side electrostatic precipitator (CS-ESP) and flue gas desulphurization (FGD), were analyzed. Sampling and analysis were carried out according to Ontario Hydro Method (OHM). Overall Hg removal efficiency of APCDs, on average, was about 61% and 47% with and without SCR system, respectively. In the flue gas, Hg was mainly distributed in gaseous (elemental and oxidized) form. The oxidized to elemental Hg partitioning coefficient increased due to oxidation of Hg 0 across the SCR system and decreased due to the removal of oxidized Hg (Hg 2+) across a wet FGD system. Hg 0 oxidation across the SCR system varied from 74% to 7% in tested coal-fired power plants. The comparative study shows that the installation of an SCR system increased Hg removal efficiency and suppressed the reemission of captured Hg 0 within a wet FGD system.
ISSN:0016-2361
1873-7153
DOI:10.1016/j.fuel.2009.06.022