Fluidized bed treatment of residues of semi-dry flue gas desulfurization units of coal-fired power plants for conversion of sulfites to sulfates

Castro, Rui de Paula Vieira de; Medeiros, José Luiz de; Araújo, Ofélia de Queiroz Fernandes; Cruz, Matheus de Andrade; Ribeiro, Gabriel Travagini; Oliveira, Vanessa Reich de

doi:10.1016/j.enconman.2017.03.078

Cited by 41 publications

(12 citation statements)

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“…Based on Angevine et al [13], considering a temperature of 550 °C and 5% of excess O2, it is possible to achieve a SO3 mass composition of 3.2% on the treated SDA waste, complying with ASTM Standard C-618 [18] Sulfur trioxide (SO3) limit for class C or F fly-ash. Based on experiments of de Castro et al [29], a conversion of 91.3% was considered for SO3 oxidation reaction. These results were considered for mass and energy balances of SDA treatment unit of CASE I.…”

Section: Heat and Mass Balances And Streams Inventorymentioning

confidence: 99%

“…The pilot-plant has a heater, a cyclone (to collect and return particles above 10 μm back to the FBR), an economizer (to partially recover the heat of the hot outlet air stream leaving the cyclone) and an air filter (to avoid emission to the atmosphere of small particles, not captured by the cyclone). de Castro et al [29] reported SO3 −2 content reduction to below 5%w/w under dry oxidation on FBR at temperatures above 500 °C. Based on experimental results of de Castro et al [29] and patent information [13], this work assesses the potential environmental impacts avoided if a full-scale SD-FGD waste treatment unit were put in operation.…”

Section: Introductionmentioning

confidence: 99%

“…de Castro et al [29] reported SO3 −2 content reduction to below 5%w/w under dry oxidation on FBR at temperatures above 500 °C. Based on experimental results of de Castro et al [29] and patent information [13], this work assesses the potential environmental impacts avoided if a full-scale SD-FGD waste treatment unit were put in operation. For a full-scale plant, an air compressor is required to supply air at the FBR pressure.…”

Section: Introductionmentioning

confidence: 99%

“…Aiming to solve the environmental challenge related to CCP landfilling, a SD-FGD waste treatment pilot-plant was designed and constructed at the Federal University of Rio de Janeiro [29]. It is based on the above-mentioned patents information with a modified layout and innovative equipment design.…”

Section: Introductionmentioning

confidence: 99%

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Environmental Performance of a Solid Waste Monetization Process Applied to a Coal-Fired Power Plant with Semi-Dry Flue Gas Desulfurization

Cruz¹,

Castro²,

Araújo³

et al. 2019

J. sustain. dev. energy water environ. syst.

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Mixing of semi-dry flue gas desulfurization solids and fly-ash from coal-fired power plants results in a solid waste contaminated by calcium sulfite. Therefore, it becomes useless for industry and is often landfilled. To support decision-making on process configurations to monetize this solid residue a gate-to-gate life cycle assessment was performed, considering three scenarios: BASE case -standard 360 MW power plant, CASE I -base plant adopting dry thermal oxidation treatment of spray dryer solids, CASE IIbypass of desulfurization system. Cases I and II allow commercialization of the solid residue as class C fly-ash. Evaluated alternatives were compared based on quantitative potential environmental impacts, using United States Environmental Protection Agency waste reduction algorithm. Based on the results, the BASE case was more aggressive to the environment, due to solid waste production. CASE II increased photochemical oxidation and acidification potentials. CASE I was the more environmentally friendly but demands additional capital and operational expenditure.

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Section: Heat and Mass Balances And Streams Inventorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Environmental Performance of a Solid Waste Monetization Process Applied to a Coal-Fired Power Plant with Semi-Dry Flue Gas Desulfurization

Cruz¹,

Castro²,

Araújo³

et al. 2019

J. sustain. dev. energy water environ. syst.

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“…Semi-dry desulfurization residues, which are the main byproducts of the semi-dry flue gas desulfurization (FGD) process, are a mixture of CaSO 4 , CaSO 3 , and CaO [1,2]. Coal-fired power plants currently produce tons of semi-dry desulfurization residues each day, so the problem of their utilization has become a focus of attention [3].…”

Section: Introductionmentioning

confidence: 99%

Effect of Additives on the Morphologies of Hydrothermal Products Prepared from Semi-Dry Desulfurization Residues

Li¹,

Hao²,

Yuan³

2018

Crystals

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For effective utilization of the residues, calcium sulfate whiskers were prepared from semi-dry desulfurization residues by hydrothermal synthesis reactions. Aiming at collecting the products with a long length and large aspect ratio, the additives, including sodium oleate, sodium dodecyl benzene sulfonate (SDBS), and sodium citrate, were added to control the growth of the crystal. Compared with no additives, whiskers with relatively a longer length and larger aspect ratio could be obtained in the presence of sodium oleate or SDBS. The sodium citrate made the whiskers thicker and shorter. Then, the effects of the additives on crystal growth and the morphology of the hydrothermal products were investigated with the aid of X-ray diffraction (XRD) patterns and molecular dynamics simulations. According to the results of XRD, the diffraction intensity of the crystal face (400) increased under the influence of sodium oleate, promoting crystal growth along the c-axis. The molecular structures of the corresponding faces were built based on the strong peaks shown in the XRD patterns. The atomic distribution on the computed crystal faces was presented. The interaction energies on different faces were calculated to illustrate the different adsorption configurations of the additives. Among the calculated faces, the interaction energies on (400) were both most negative for sodium oleate and SDBS. Therefore, sodium oleate and SDBS preferred to adsorb on (400). As a result, the growth of (400) was thus inhibited and the crystal grew along the c-axis. Compared with sodium oleate and SDBS, the lowest adsorption energy of sodium citrate on the face (310) indicated that sodium citrate has no positive effect on the directional growth of the crystal parallel to c-axis. The molecular simulation results were virtually identical to the crystal faces analysis results.

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Mathematical modeling, steady state simulation, parametric analysis and optimization of SO₂ capture in a countercurrent moving bed (CaO and C) reactor

Stefas

Manavi

Paloukis

et al. 2018

J of Chemical Tech & Biotech

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The use of absorbents based on calcium for the reduction of SO2 emissions from power plants has been studied for the last 30 years. The present work is part of a research project aimed at the development of a moving bed limestone filter. It is placed after burning in order to capture the SO2 from the flue gases of pulverized lignite combustors. A heterogeneous mathematical model was developed for the steady‐state simulation of a gas–solid countercurrent moving bed reactor. The mathematical model was solved using the method of finite elements and gave results for the temperature and conversion profile along the reactor. Also, parametric analysis (for Tg,in, Ts,in, us, qo, yitalicSO2o, yO2o, do, zo) was performed and useful conclusions concerning the behavior of a moving bed reactor in different conditions were drawn. Finally, optimization of conditions was performed to give an SO2 conversion higher than 0.95. The results are of important technological interest as a dry process in applications of SO2 capture. © 2018 Society of Chemical Industry

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Fluidized bed treatment of residues of semi-dry flue gas desulfurization units of coal-fired power plants for conversion of sulfites to sulfates

Cited by 41 publications

References 16 publications

Environmental Performance of a Solid Waste Monetization Process Applied to a Coal-Fired Power Plant with Semi-Dry Flue Gas Desulfurization

Environmental Performance of a Solid Waste Monetization Process Applied to a Coal-Fired Power Plant with Semi-Dry Flue Gas Desulfurization

Effect of Additives on the Morphologies of Hydrothermal Products Prepared from Semi-Dry Desulfurization Residues

Mathematical modeling, steady state simulation, parametric analysis and optimization of SO₂ capture in a countercurrent moving bed (CaO and C) reactor

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Fluidized bed treatment of residues of semi-dry flue gas desulfurization units of coal-fired power plants for conversion of sulfites to sulfates

Cited by 41 publications

References 16 publications

Environmental Performance of a Solid Waste Monetization Process Applied to a Coal-Fired Power Plant with Semi-Dry Flue Gas Desulfurization

Environmental Performance of a Solid Waste Monetization Process Applied to a Coal-Fired Power Plant with Semi-Dry Flue Gas Desulfurization

Effect of Additives on the Morphologies of Hydrothermal Products Prepared from Semi-Dry Desulfurization Residues

Mathematical modeling, steady state simulation, parametric analysis and optimization of SO2 capture in a countercurrent moving bed (CaO and C) reactor

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Mathematical modeling, steady state simulation, parametric analysis and optimization of SO₂ capture in a countercurrent moving bed (CaO and C) reactor