Selectivity of transition metal catalysts in promoting the oxidation of solid sulfites in flue gas desulfurization

Wang, Lidong; Wang, Juan; Pan, Xu; Li, Qiangwei; Zhang, Wendi; Cui, Shuai

doi:10.1016/j.apcata.2015.10.008

Cited by 49 publications

(12 citation statements)

References 30 publications

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“…At present, there are many methods for treating flue gas in China and abroad [3][4][5][6][7]. According to the state of the desulfurizer, it is divided into three types: the wet method [8][9][10][11], the dry method [12], and the semi-dry method [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Study on the Flow Characteristics of Desulfurization Ash Fine Particles in a Circulating Fluidized Bed

et al. 2021

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In view of the current status of catalytic cracking flue gas treatment, it is necessary to study the flow environment of desulfurization ash particles, which are a type of Geldart C particle, in a circulating fluidized bed (CFB) for semi-dry flue gas desulphurization using CFB technology. This study investigated the flow characteristics of desulphurization ash particles in a riser with an inner diameter of 70 mm and a height of 12.6 m, at a gas velocity of 4–7 m/s and a solids circulation rate of 15–45 kg/m2·s. The solids holdup in the axial distribution is relatively high near the bottom of the riser, and gradually decreases as the riser height increases, with a stable value from the middle to the top of the riser. In the radial distribution, the solids holdup of desulfurization ash particles is low in the center and high in the wall region. Within the above operating conditions, the solids holdup ranges from 0.008 to 0.025. The particle-based Archimedes number has a linear relationship with the solids holdup at all operating conditions.

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Section: Introductionmentioning

confidence: 99%

Study on the Flow Characteristics of Desulfurization Ash Fine Particles in a Circulating Fluidized Bed

et al. 2021

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“…Ning et al 8 found that Fe 2+ and Mn 2+ could enhance the In some previous studies, 13,14 the activation energies of Mn 2+ (22.36 kJ/mol), Fe 3+ (24.35 kJ/mol), and no metal ion (63.93 kJ/mol) for the S(IV) oxidation were calculated. The results showed that Mn 2+ and Fe 3+ play an important role in S(IV) oxidation.…”

Section: Resultsmentioning

confidence: 99%

Efficient Removal of Sulfur Dioxide from Flue Gas through Liquid Catalytic Oxidation Using Copper Tailing as the In Situ Iron Ion Donator

Tao

Wang

et al. 2020

Energy Fuels

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In recent years, the utilization of copper tailing and removal of sulfur dioxide (SO2) have become the focus of research. In this study, copper tailing was used as an iron ion donator to remove SO2 from flue gas. To improve the desulfurization performance, the additive was selected from metal sulfates, such as ferrous sulfate, ferric sulfate, manganese sulfate, and scrap iron. A series of experiments were conducted in a bubble reactor to study the effects of various critical factors, including the inlet SO2 concentration, solid/liquid ratio, dosage of additive, gas flow rate, O2 concentration, and reaction temperature, on the flue gas desulfurization performance. Various characterizations, such as X-ray fluorescence spectroscopy, X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy with energy-dispersive spectroscopy, X-ray photoelectron spectroscopy, inductively coupled plasma spectroscopy, and titration, were used to study the properties of copper tailing and absorption liquid. Furthermore, the reaction mechanism of SO2 removal was also studied. The results showed that copper tailing combined with MnSO4·H2O exhibited the highest SO2 removal efficiency. The desulfurization efficiency reached approximately 99% and was mainly affected by the flue gas flow rate and the absorption temperature. Mn2+ served as a catalyst for liquid-phase catalytic oxidation. Furthermore, the leaching reaction contributed to the consumption of some H+, whereas Fe2+ (primarily leached from fayalite in the copper tailing) served as its activation state and variable valence state with Mn2+ for the efficient removal of SO2. Moreover, the reduction of flue gas desulfurization is attributed to the accumulation of SO4 2– and H+ in the slurry.

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“…However, uncovering the mechanism of WFGD in specific cases requires solid knowledge of the physicochemical absorption and the characteristics of the relevant devices in the tower. Additionally, the excessive assumptions made in the mechanism models and the high computation cost limits the accurate capture of the complexities and characteristics of the WFGD system [21].…”

Section: Literature Reviewmentioning

confidence: 99%

A Many-Objective Optimization for an Eco-Efficient Flue Gas Desulfurization Process Using a Surrogate-Assisted Evolutionary Algorithm

Dong¹,

Wang²,

Peng

et al. 2021

Sustainability

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The flue gas desulfurization process in coal-fired power plants is energy and resource-intensive but the eco-efficiency of this process has scarcely been considered. Given the fluctuating unit load and complex desulfurization mechanism, optimizing the desulfurization system based on the traditional mechanistic model poses a great challenge. In this regard, the present study optimized the eco-efficiency from the perspective of operating data analysis. We formulated the issue of eco-efficiency improvement into a many-objective optimization problem. Considering the complexity between the system inputs and outputs and to further reduce the computational cost, we constructed a Kriging model and made a comparison between this model and the response surface methodology based on two accuracy metrics. This surrogate model was then incorporated into the NSGA-III algorithm to obtain the Pareto-optimal front. As this Pareto-optimal front provides multiple alternative operating options, we applied the TOPSIS to select the most appropriate alternative set of operating parameters. This approach was validated using the historical operation data from the desulfurization system at a coal-fired power plant in China with a 600 MW unit. The results indicated that the optimization would cause an improvement in the efficiency of desulfurization and energy efficiency but a slight increase in the consumption of limestone slurry. This study attempted to provide an effective operating strategy to enhance the eco-efficiency performance of desulfurization systems.

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Selectivity of transition metal catalysts in promoting the oxidation of solid sulfites in flue gas desulfurization

Cited by 49 publications

References 30 publications

Study on the Flow Characteristics of Desulfurization Ash Fine Particles in a Circulating Fluidized Bed

Study on the Flow Characteristics of Desulfurization Ash Fine Particles in a Circulating Fluidized Bed

Efficient Removal of Sulfur Dioxide from Flue Gas through Liquid Catalytic Oxidation Using Copper Tailing as the In Situ Iron Ion Donator

A Many-Objective Optimization for an Eco-Efficient Flue Gas Desulfurization Process Using a Surrogate-Assisted Evolutionary Algorithm

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