Sulfite removal from flue-gas desulfurization residues of coal-fired power plants: Oxidation experiments and kinetic parameters estimation

Semi-dry flue-gas desulfurization (FGD) processes abate 99% of atmospheric emissions of sulfur dioxide from coal-fired power plants at the expense of producing daily tones of solid FGD residues containing sulfites, sulfates, carbonates and hydroxides of calcium and magnesium, besides fly-ashes. In t...

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Autores principales:	Igor Nunes Rodrigues, José Luiz de Medeiros, Ofélia de Queiroz F. Araújo
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Coal-fired power plants Flue-gas desulfurization FGD Flue-gas desulfurization residue Dry-oxidation Kinetic model Electrical engineering. Electronics. Nuclear engineering TK1-9971
Acceso en línea:	https://doaj.org/article/529a1e84c70d419c89cb0fdaab20b822
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spelling	oai:doaj.org-article:529a1e84c70d419c89cb0fdaab20b8222021-11-28T04:33:43ZSulfite removal from flue-gas desulfurization residues of coal-fired power plants: Oxidation experiments and kinetic parameters estimation2352-484710.1016/j.egyr.2021.04.062https://doaj.org/article/529a1e84c70d419c89cb0fdaab20b8222021-11-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2352484721003735https://doaj.org/toc/2352-4847Semi-dry flue-gas desulfurization (FGD) processes abate 99% of atmospheric emissions of sulfur dioxide from coal-fired power plants at the expense of producing daily tones of solid FGD residues containing sulfites, sulfates, carbonates and hydroxides of calcium and magnesium, besides fly-ashes. In this work, a fluidized-bed reactor pilot plant was used for experiments of dry-oxidation of FGD residues aiming at converting sulfites into sulfates in order to upgrade such residues for utilization as raw material to the cement industry. A two-dimensional design of experiments on the plane of feed air temperature and reactor time-on-stream was conducted in the pilot plant generating sulfite conversion data and transient reactor temperature profiles. These data were used for estimating the first-order kinetic parameters of sulfite conversion via non-linear regression following the Maximum Likelihood Principle. The optimized Arrhenius factor and Arrhenius activation energy obtained via the Nelder–Mead Flexible Simplex method were, respectively, 0.001 mol/kg.s.bar and 14146.5 J/mol. This kinetic model allows designing large-scale plants for treatment of semi-dry FGD residues in order to beneficiate it for utilization in the cement industry, avoiding the disposal and environmental costs of landfilling such residues.Igor Nunes RodriguesJosé Luiz de MedeirosOfélia de Queiroz F. AraújoElsevierarticleCoal-fired power plantsFlue-gas desulfurizationFGDFlue-gas desulfurization residueDry-oxidationKinetic modelElectrical engineering. Electronics. Nuclear engineeringTK1-9971ENEnergy Reports, Vol 7, Iss , Pp 8142-8151 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Coal-fired power plants Flue-gas desulfurization FGD Flue-gas desulfurization residue Dry-oxidation Kinetic model Electrical engineering. Electronics. Nuclear engineering TK1-9971
spellingShingle	Coal-fired power plants Flue-gas desulfurization FGD Flue-gas desulfurization residue Dry-oxidation Kinetic model Electrical engineering. Electronics. Nuclear engineering TK1-9971 Igor Nunes Rodrigues José Luiz de Medeiros Ofélia de Queiroz F. Araújo Sulfite removal from flue-gas desulfurization residues of coal-fired power plants: Oxidation experiments and kinetic parameters estimation
description	Semi-dry flue-gas desulfurization (FGD) processes abate 99% of atmospheric emissions of sulfur dioxide from coal-fired power plants at the expense of producing daily tones of solid FGD residues containing sulfites, sulfates, carbonates and hydroxides of calcium and magnesium, besides fly-ashes. In this work, a fluidized-bed reactor pilot plant was used for experiments of dry-oxidation of FGD residues aiming at converting sulfites into sulfates in order to upgrade such residues for utilization as raw material to the cement industry. A two-dimensional design of experiments on the plane of feed air temperature and reactor time-on-stream was conducted in the pilot plant generating sulfite conversion data and transient reactor temperature profiles. These data were used for estimating the first-order kinetic parameters of sulfite conversion via non-linear regression following the Maximum Likelihood Principle. The optimized Arrhenius factor and Arrhenius activation energy obtained via the Nelder–Mead Flexible Simplex method were, respectively, 0.001 mol/kg.s.bar and 14146.5 J/mol. This kinetic model allows designing large-scale plants for treatment of semi-dry FGD residues in order to beneficiate it for utilization in the cement industry, avoiding the disposal and environmental costs of landfilling such residues.
format	article
author	Igor Nunes Rodrigues José Luiz de Medeiros Ofélia de Queiroz F. Araújo
author_facet	Igor Nunes Rodrigues José Luiz de Medeiros Ofélia de Queiroz F. Araújo
author_sort	Igor Nunes Rodrigues
title	Sulfite removal from flue-gas desulfurization residues of coal-fired power plants: Oxidation experiments and kinetic parameters estimation
title_short	Sulfite removal from flue-gas desulfurization residues of coal-fired power plants: Oxidation experiments and kinetic parameters estimation
title_full	Sulfite removal from flue-gas desulfurization residues of coal-fired power plants: Oxidation experiments and kinetic parameters estimation
title_fullStr	Sulfite removal from flue-gas desulfurization residues of coal-fired power plants: Oxidation experiments and kinetic parameters estimation
title_full_unstemmed	Sulfite removal from flue-gas desulfurization residues of coal-fired power plants: Oxidation experiments and kinetic parameters estimation
title_sort	sulfite removal from flue-gas desulfurization residues of coal-fired power plants: oxidation experiments and kinetic parameters estimation
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/529a1e84c70d419c89cb0fdaab20b822
work_keys_str_mv	AT igornunesrodrigues sulfiteremovalfromfluegasdesulfurizationresiduesofcoalfiredpowerplantsoxidationexperimentsandkineticparametersestimation AT joseluizdemedeiros sulfiteremovalfromfluegasdesulfurizationresiduesofcoalfiredpowerplantsoxidationexperimentsandkineticparametersestimation AT ofeliadequeirozfaraujo sulfiteremovalfromfluegasdesulfurizationresiduesofcoalfiredpowerplantsoxidationexperimentsandkineticparametersestimation
_version_	1718408317039017984

Sulfite removal from flue-gas desulfurization residues of coal-fired power plants: Oxidation experiments and kinetic parameters estimation

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