Effects of pH on Hg0 Re-Emission in WFGD

Yong Qiu; Hui Wu; Guang Qian Luo; Hong Yao

doi:10.4028/www.scientific.net/AMR.960-961.462

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 960-961Effects of pH on Hg0 Re-Emission in WFGD

Effects of pH on Hg⁰Re-Emission in WFGD

Abstract:

Gaseous oxidized mercury (Hg²⁺) in the flue gas is soluble in water and can be captured effectively by Wet flue gas desulfurization (WFGD) system. But in some extent Hg⁰re-emission happens due to the reduction of absorbed Hg²⁺, and the pH of slurry is an important factor affecting Hg⁰re-emission. In this study, the theoretical formulas of slurry pH were derived through the conventional solution theory and then were used to evaluate the factors determining the pH of slurry. A series of laboratory experiments were carried out under N_2, CO₂ and O₂/N₂atmosphere to measure the Hg⁰re-emission tendency at different pH values. The results show that the higher the pH, the less Hg²⁺ reduced by S(IV), resulting in the decrease of Hg⁰re-emission. Under N₂ atmosphere, the Hg⁰re-emission was mild at pH>4 while it was dramatic at pH<4. Under O₂/N₂ atmosphere, the addition of O₂ extended the time span of Hg⁰re-emission at low pH and increased Hg⁰re-emission unexpectedly in the latter part of the experiments at high pH. CO₂ atmosphere almost did not affect Hg⁰re-emission because of its little effect on the slurry pH.

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Periodical:

Advanced Materials Research (Volumes 960-961)

Pages:

462-468

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.960-961.462

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Online since:

June 2014

Authors:

Yong Qiu, Hui Wu, Guang Qian Luo*, Hong Yao

Keywords:

Desulfurization Slurry, Flue Gas, Mercury, Oxy-Fuel, WFGD

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