Thermodynamic possibilities of flue gas dry desulfurization, de-HCl, removal of mercury, and zinc compounds in a system with Na2CO3, Ca(OH)(2), sulfur, and HBr addition | Health & Environmental Research Online (HERO)

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Citation
Tags

HERO ID

6575310

Reference Type

Journal Article

Title

Thermodynamic possibilities of flue gas dry desulfurization, de-HCl, removal of mercury, and zinc compounds in a system with Na2CO3, Ca(OH)(2), sulfur, and HBr addition

Author(s)

Ruzovic, T; Svoboda, K; Leitner, J; Pohorely, M; Hartman, M; ,

Year

2020

Is Peer Reviewed?

Yes

Journal

Chemical Papers / Chem Zvesti
ISSN: 0366-6352
EISSN: 1336-9075

Publisher

SPRINGER INTERNATIONAL PUBLISHING AG

Location

CHAM

Volume

Issue

Page Numbers

951-962

Language

English

DOI

10.1007/s11696-019-00930-7

Web of Science Id

WOS:000520152200021

URL

http://://WOS:000520152200021
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Abstract

Dry methods of flue gas cleaning are usually based on calcium hydroxide or sodium bicarbonate (NaHCO3), which is "in situ" decomposed to active soda (Na2CO3). Together with acid gases also emissions of volatile heavy metals (e.g., mercury and some Zn-compounds) have to be reduced. Removal of both main forms of mercury (Hg-0 and Hg2+) from the flue gas is dependent on chemical reactions and sorption processes at the temperatures below approx. 300 degrees C. In this theoretical study, attention was concentrated on the thermodynamics of gas-solid reactions (de-HCl and desulfurization), reactions of Hg/HgCl2 vapours and Zn-compounds, with soda and Ca(OH)(2) in the presence of acid gases, and on effects of elemental sulfur and HBr addition. Influence of sorbents/additives and conditions (temperature, gas phase composition) on the equilibrium concentrations of gaseous and solid species was studied at temperatures 400-560 K (127-287 degrees C). Two types of alkaline solid sorbents have been theoretically analyzed: Na2CO3 and Ca(OH)(2). The thermodynamic analyses involved systems with computations of gas/solid phase composition on a basis of assumption of solid phases with unit activities (stable, basic state). Application of the minimization of Gibbs energy for the chosen systems was used for the determination of equilibrium composition of gas and solid phases.

Keywords

Flue gas cleaning; Mercury removal; Thermodynamics; hydrated lime reaction; heavy-metals; oxidation; sorbents; behavior; adsorption; speciation; Chemistry

Conference Name

44th International Conference of Slovak-Society-of-Chemical-Engineering (SSCHE)

Conference Location

Tatranske Matliare, SLOVAKIA