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Impact of additives for enhanced sulfur dioxide removal on re-emissions of mercury in wet flue gas desulfurization

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  • Heidel, Barna
  • Hilber, Melanie
  • Scheffknecht, Günter

Abstract

The wet flue gas desulfurization process (FGD) in fossil fired power plants offers the advantage of simultaneously removing SO2 and other water soluble pollutants, such as certain oxidized mercury compounds (Hg2+). In order to maximize SO2 removal efficiency of installed FGD units, organic additives can be utilized. In the context of multi-pollutant control by wet FGD, the effect of formic and adipic acid on redox reactions of dissolved mercury compounds is investigated with a continuously operated lab-scale test-rig. For sulfite (SO32-) concentrations above a certain critical value, their potential as reducing agent leads to rapidly increasing formation and re-emission of elemental mercury (Hg0). Increasing chloride concentration and decreasing pH and slurry temperature have been identified as key factors for depressing Hg0 re-emissions. Both organic additives have a negative impact on Hg-retention and cause increased Hg0 re-emissions in the wet FGD process, with formic acid being the significantly stronger reducing agent. Different pathways of Hg2+ reduction were identified by qualitative interpretation of the pH-dependence and by comparison of activation enthalpies and activation entropies. While the first mechanism proposed identifies SO32- as reducing agent and is therefore relevant for any FGD process, the second mechanism involves the formate anion, thus being exclusively relevant for FGDs utilizing formic acid as additive.

Suggested Citation

  • Heidel, Barna & Hilber, Melanie & Scheffknecht, Günter, 2014. "Impact of additives for enhanced sulfur dioxide removal on re-emissions of mercury in wet flue gas desulfurization," Applied Energy, Elsevier, vol. 114(C), pages 485-491.
    • Handle: RePEc:eee:appene:v:114:y:2014:i:c:p:485-491
    DOI: 10.1016/j.apenergy.2013.09.059
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    References listed on IDEAS

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    1. Islas, Jorge & Grande, Genice, 2008. "Abatement costs of SO2-control options in the Mexican electric-power sector," Applied Energy, Elsevier, vol. 85(2-3), pages 80-94, February.
    2. Sun, Zhongwei & Wang, Shengwei & Zhou, Qulan & Hui, Shi'en, 2010. "Experimental study on desulfurization efficiency and gas-liquid mass transfer in a new liquid-screen desulfurization system," Applied Energy, Elsevier, vol. 87(5), pages 1505-1512, May.
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    Cited by:

    1. Łuszkiewicz, Dariusz & Jędrusik, Maria & Świerczok, Arkadiusz & Kobylańska-Pawlisz, Mariola, 2023. "Effect of addition of sulphide based additive to WFGD slurry on mercury removal from flue gas," Energy, Elsevier, vol. 270(C).
    2. Zhao, Haitao & Mu, Xueliang & Yang, Gang & George, Mike & Cao, Pengfei & Fanady, Billy & Rong, Siyu & Gao, Xiang & Wu, Tao, 2017. "Graphene-like MoS2 containing adsorbents for Hg0 capture at coal-fired power plants," Applied Energy, Elsevier, vol. 207(C), pages 254-264.
    3. Chen, Long & Xu, Guiyin & Rui, Zhenhua & Alshawabkeh, Akram N., 2019. "Demonstration of a feasible energy-water-environment nexus: Waste sulfur dioxide for water treatment," Applied Energy, Elsevier, vol. 250(C), pages 1011-1022.
    4. Heidel, Barna & Rogge, Tobias & Scheffknecht, Günter, 2016. "Controlled desorption of mercury in wet FGD waste water treatment," Applied Energy, Elsevier, vol. 162(C), pages 1211-1217.

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