Experimental and modelling analysis of seawater scrubbers for sulphur dioxide removal from flue-gas

Flagiello, D.; Erto, Alessandro; Lancia, A.; Natale, F. Di

doi:10.1016/j.fuel.2017.10.098

Cited by 81 publications

(27 citation statements)

References 24 publications

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“…Theoretical SO 2 removal efficiency matches the experimental SO 2 removal efficiency generated at different gas and liquid flow rates and SO 2 concentrations in the gas phase. Figure 2 shows a comparison between theoretical and experimental SO2 absorption data obtained by Flagiello et al [9] via a seawater scrubbing process in a structured packed-bed column (D = 0.1 m; H = 0.892 m) with Sulzer Mellapak 250X. Theoretical SO2 removal efficiency matches the experimental SO2 removal efficiency generated at different gas and liquid flow rates and SO2 concentrations in the gas phase.…”

Section: Numerical Implementationmentioning

confidence: 69%

“…The major advantage of performing with seawater includes the simultaneous elimination of NO x and SO 2 from exhaust gas, undemanding plant design, compact scrubber system, no chemicals and absence of solid by-products. Furthermore, in the case of open loop scrubbers the acidified effluent is discharged into the ocean after neutralization [9]. Additionally, seawater scrubbers working under pressure excludes the losing of marine engines power because of the backpressure (no need to compensate the backpressure as in the case of seawater scrubbers operated at atmospheric pressure).…”

Section: Introductionmentioning

confidence: 99%

“…Tang et al [14] investigated the desulphurization efficiency of a magnesium-based seawater scrubber on-board large marine ships and found that the ratio between the liquid and gas flow rates and pH are key parameters influencing the desulphurization efficiency. Flagiello et al [9] analyzed experimentally and theoretically SO 2 removal from flue gas in a seawater packed-bed column filled with a structured packing (Mellapak 250X) at 0.1 MPa and 25 • C. Yang et al [6] proposed the removal of NO x and SO 2 from ship emissions in a semi-continuous bubble column reactor using electrolyzed seawater. The results illustrate that NO x removal efficiency can be improved by the increase of the inlet NO concentration, the concentration of CO 2 and O 2 (coexisting gases), reaction temperature and active chlorine concentration, but is impeded by the increase of the gas velocity.…”

Section: Introductionmentioning

confidence: 99%

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Modeling and Simulations of NOx and SO2 Seawater Scrubbing in Packed-Bed Columns for Marine Applications

Iliuta

Larachi

2019

Catalysts

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Seawater scrubbing of nitrogen oxides and sulfur oxide from marine emissions was simulated in packed-bed columns exposed to static inclination and heaving/oscillating motions. Fourth generation random packings (Raschig super-Rings) while providing much smaller pressure drop than traditional Pall-Rings ensure comparable absorption efficiency for the pollutants. Complete removal of SO2 was predicted over the tested pressure range with absorption efficiency indifferent to scrubber inclination or heaving/oscillating motions. In contrast, NOx and CO2 absorptions are negatively impacted for inclined seawater scrubbers. Removal efficiency is not lowered significantly owing to larger scrubber pressure and because diffusion of N2O4 into the liquid phase is associated with a rapid pseudo first-order reaction. The asymmetrical oscillating motion of the scrubber degrades the removal performance which exhibits wavy patterns close to the steady-state solution of the average inclination angle. NO and CO2 absorption performance waves are moving toward a steady-state solution of vertical scrubber when the asymmetry of the two inclined positions of the scrubber downgrades. Symmetric oscillation and heaving motion led to performance disturbance waves around a steady-state solution of the vertical scrubber which are determined by the parameters of angular/heaving motion.

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Section: Numerical Implementationmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Modeling and Simulations of NOx and SO2 Seawater Scrubbing in Packed-Bed Columns for Marine Applications

Iliuta

Larachi

2019

Catalysts

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“…However, literature concerning the application of seawater desulphurization in ships is still limited, and most of the studies that have been recorded focus on the optimization of the operation parameters. Only a few papers can be found that target the optimization of scrubber structure parameters . Conventional scaling‐up and optimization methods through experiments are too costly; however, the CFD method can simplify and accelerate this process.…”

Section: Introductionmentioning

confidence: 99%

“…Only a few papers can be found that target the optimization of scrubber structure parameters. [17][18][19] Conventional scaling-up and optimization methods through experiments are too costly; however, the CFD method can simplify and accelerate this process. Recently, significant progress has been made in the FGD mathematical model that is based on CFD.…”

Section: Introductionmentioning

confidence: 99%

Structure Optimization of Vessel Seawater Desulphurization Scrubber Based on CFD and SVM‐GA Methods

et al. 2019

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The miniaturization of the scrubber used in vessel flue gas desulphurization is a critical issue. In this study, the structure optimization of the vessel desulphurization scrubber based on CFD (computational fluid dynamics) and the SVM‐GA (support vector machine and genetic algorithm) is performed and a miniaturized scrubber design with the same desulphurization efficiency as large scrubbers is obtained. First, the seawater SO2 absorption process in a vessel desulphurization scrubber is investigated using the CFD‐DPM method, and the effects of the operating and structural parameters on the desulphurization efficiency η are discussed in detail. Results show that η is positively correlated to the absorption area height, H2, and the spray level number, N, and η first increases and then decreases with an increase in the scrubber diameter, D1, as well as the inlet flue angle, θ. Then, a prediction model of η considering D1, H2, θ, and N is established and validated using the SVM with the simulation data. Finally, D1, H2, θ, and N are optimized using the GA method based on the SVM model. The results show that the volume of the absorption area, Vab, can be reduced by 30 % while maintaining the same η through the use of this optimization method.

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Absorption

Karayiannis

Laso

2018

Kirk-Othmer Encyclopedia of Chemical Technology

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Absorption, or gas absorption, is a unit operation used in the chemical industry to separate gases by washing or scrubbing a gas mixture with a suitable liquid. One or more of the gas components dissolves or is absorbed in the liquid and is thus removed from the mixture. Absorption is currently one of the most important processes in chemical engineering not only for product recovery but also, and perhaps mainly, for pollutant removal. Intense industrial and academic effort is focused on optimizing the process, in terms process efficiency as well as commercial aspects. In this article, the fundamental principles of gas solubility and mass transfer, design and operation of industrial equipment with relevant examples of typical commercial gas absorption processes are discussed, including recent developments in these areas.

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Experimental and modelling analysis of seawater scrubbers for sulphur dioxide removal from flue-gas

Cited by 81 publications

References 24 publications

Modeling and Simulations of NOx and SO2 Seawater Scrubbing in Packed-Bed Columns for Marine Applications

Modeling and Simulations of NOx and SO2 Seawater Scrubbing in Packed-Bed Columns for Marine Applications

Structure Optimization of Vessel Seawater Desulphurization Scrubber Based on CFD and SVM‐GA Methods

Absorption

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