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Possibilities of Mercury Removal in the Dry Flue Gas Cleaning Lines of Solid Waste Incineration Units

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    0450927 - UCHP-M 2016 RIV GB eng J - Journal Article
    Svoboda, Karel - Hartman, Miloslav - Šyc, Michal - Pohořelý, Michael - Kameníková, Petra - Jeremiáš, Michal - Durda, Tomáš
    Possibilities of Mercury Removal in the Dry Flue Gas Cleaning Lines of Solid Waste Incineration Units.
    Journal of Environmental Management. Roč. 166, JAN 15 (2016), s. 499-511. ISSN 0301-4797
    R&D Projects: GA TA ČR TE02000236
    Institutional support: RVO:67985858
    Keywords : waste incineration * mercury removal * flue gas
    Subject RIV: CI - Industrial Chemistry, Chemical Engineering
    OBOR OECD: Chemical process engineering
    Impact factor: 4.010, year: 2016

    Dry methods of the flue gas cleaning are useful particularly in smaller solid waste incineration units. The amount and forms of mercury emissions depend on waste composition, content of mercury and chlorine and on the entire process of the flue gas cleaning. In the case of high HCl/total Hg molar ratio in the flue gas, the majority of mercury is present in the form of HgCl2 and a smaller amount in the form of mercury vapors at higher temperatures. Removal of both main forms of mercury from the flue gas is dependent on chemical reactions and sorption processes at the temperatures below approx. 340°C. Significant part of HgCl2 and a small part of elemental Hg vapors can be adsorbed on fly ash and solid particle in the air pollution control processes, which are removed in dust filters. Injection of non-impregnated active carbon or activated lignite coke particles is able to remove mainly the oxidized Hg2þ compounds. Vapors of metallic Hgo are adsorbed relatively weakly. Much better chemisorption of Hgo together with higher sorbent capacity is achieved by AC-based sorbents impregnated with sulfur, alkali poly-sulfides, etc.
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