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Sulfite removal from flue-gas desulfurization residues of coal-fired power plants: Oxidation experiments and kinetic parameters estimation
| Content Provider | Directory of Open Access Journals (DOAJ) |
|---|---|
| Author | José Luiz de Medeiros Ofélia de Queiroz F. Araújo Igor Nunes Rodrigues |
| Abstract | 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. |
| Related Links | http://www.sciencedirect.com/science/article/pii/S2352484721003735 |
| e-ISSN | 23524847 |
| DOI | 10.1016/j.egyr.2021.04.062 |
| Journal | Energy Reports |
| Volume Number | 7 |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2021-01-01 |
| Publisher Place | United Kingdom |
| Access Restriction | Open |
| Subject Keyword | Electrical Engineering. Electronics. Nuclear Engineering Coal-fired Power Plants Flue-gas Desulfurization Fgd Flue-gas Desulfurization Residue Dry-oxidation Kinetic Model |
| Content Type | Text |
| Resource Type | Article |
