Absorption with instantaneous reaction in a droplet with sparingly soluble fines

Scala, Fabrizio; D'Ascenzo, Michele

doi:10.1002/aic.690480813

Cited by 13 publications

(5 citation statements)

References 12 publications

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“…17 These authors presented a detailed model for gas absorption followed by instantaneous irreversible reaction in a rigid droplet containing sparingly soluble fine reactant particles. The diffusion/reaction equations were solved analytically giving a simple expression for the instantaneous gas absorption rate to the droplet without having to know a priori the location of the reaction fronts.…”

Section: Model Descriptionmentioning

confidence: 41%

Spray-Dry Desulfurization of Flue Gas from Heavy Oil Combustion

Scala

Lancia

Nigro

et al. 2005

Journal of the Air & Waste Management Association

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An experimental investigation on sulfur dioxide removal in a pilot-scale spray dryer from the flue gas generated by combustion of low-sulfur (S) heavy oil is reported. A limewater slurry was sprayed through an ultrasonic two-fluid atomizer in the spray-dry chamber, and the spent sorbent was collected downstream in a pulse-jet baghouse together with fly ash. Flue gas was sampled at different points to measure the desulfurization efficiency after both the spray-dry chamber and the baghouse. Parametric tests were performed to study the effect of the following variables: gas inlet temperature, difference between gas outlet temperature and adiabatic saturation temperature, lime-to-S ratio, and average size of lime particles in the slurry.Results indicated that spray drying is an effective technology for the desulfurization of low-S fuel oil flue gas, provided operating conditions are chosen carefully.In particular, the lowest gas inlet and outlet temperatures compatible with baghouse operation should be selected, as should a sufficiently high lime-to-S ratio. The attainment of a small lime particle size in the slurry is critical for obtaining a high desulfurization efficiency.A previously presented spray-dry flue gas desulfurization model was used to simulate the pilot-scale desulfurization tests, to check the ability of the model to predict the S capture data and its usefulness as a design tool, minimizing the need for pilot-scale experimentation.Comparison between model and experimental results was fairly good for the whole range of calcium/S ratios considered.

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Section: Model Descriptionmentioning

confidence: 41%

Spray-Dry Desulfurization of Flue Gas from Heavy Oil Combustion

Scala

Lancia

Nigro

et al. 2005

Journal of the Air & Waste Management Association

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“…These assumptions are regarded as reasonable based on the previous works from the literature [23,24] for the construction of a first principle simulation model. Effective mixing is caused by the fluidized bed where all reactions occur and the latent heat of vaporization dominates the energy balance.…”

Section: Mathematical Modelingmentioning

confidence: 47%

Dynamic Modeling and Analysis of an Industrial Gas Suspension Absorber for Flue Gas Desulfurization

Cignitti

Mansouri

Sales‐Cruz

et al. 2015

Emiss. Control Sci. Technol.

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In this work, semidry desulfurization of flue gas using a gas suspension absorber (GSA) is studied. A simple dynamic model which can properly represent the GSA was developed. In order to model the reaction kinetics, an empirical reaction rate expression was introduced. The reaction rate expression parameters were fitted to operational data from a real cement plant. A detailed statistical analysis of the parameter estimation procedure was performed, and the confidence intervals for estimated kinetic parameters were calculated. The model and reaction rate expression prediction ability was tested using another plant data set. It was verified that in spite of the simplicity of the model, very good prediction of industrial behavior was obtained. Furthermore, the dynamic analysis of the system was performed by carrying out open-loop and closed-loop simulations to verify plant dynamics. Therefore, a simple dynamic model with a reaction rate expression that is simple and efficient to use to predict the dynamics of GSA process was proposed in this work.

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“…Scala and D'Ascenzo discussed the case of gas absorption followed by an instantaneous irreversible chemical reaction into a rigid droplet containing sparingly soluble, fine reactant particles, assuming slow reactant particle dissolution which implies that particle shrinkage is negligible. Conditions are also given for the applicability of the model.…”

Section: Literature Reviewmentioning

confidence: 99%

Gas Absorption in Slurries of Fine Particles: SO₂−Mg(OH)₂−MgSO₃ System

Kakaraniya

Kari

Verma

et al. 2007

Ind. Eng. Chem. Res.

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The problem of gas absorption with reaction, in a slurry containing fine particles, is important in the development of processes for the removal of acidic pollutants such as sulfur dioxide. Typically, lime and lime stone slurries can be used for removal of sulfur dioxide. However, magnesium hydroxide slurries may yield a higher scrubbing capacity as a result of the more soluble reaction product, magnesium sulfite, compared to the corresponding calcium salt. In this study, absorption experiments were carried out in a stirred cell and the resulting data is analyzed using the model proposed by Mehra [Chem. Eng. Sci. 1996, 51, 461-477]. The proposed theory incorporates the process of particle dissolution and the consequent change in particle size near the gas-liquid interface, using Higbie's model of mass transfer with chemical reaction. A population balance approach is used to track the particle size distribution.

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Absorption with instantaneous reaction in a droplet with sparingly soluble fines

Abstract: water is discussed.

Cited by 13 publications

References 12 publications

Spray-Dry Desulfurization of Flue Gas from Heavy Oil Combustion

Spray-Dry Desulfurization of Flue Gas from Heavy Oil Combustion

Dynamic Modeling and Analysis of an Industrial Gas Suspension Absorber for Flue Gas Desulfurization

Gas Absorption in Slurries of Fine Particles: SO₂−Mg(OH)₂−MgSO₃ System

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Absorption with instantaneous reaction in a droplet with sparingly soluble fines

Abstract: water is discussed.

Cited by 13 publications

References 12 publications

Spray-Dry Desulfurization of Flue Gas from Heavy Oil Combustion

Spray-Dry Desulfurization of Flue Gas from Heavy Oil Combustion

Dynamic Modeling and Analysis of an Industrial Gas Suspension Absorber for Flue Gas Desulfurization

Gas Absorption in Slurries of Fine Particles: SO2−Mg(OH)2−MgSO3 System

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Gas Absorption in Slurries of Fine Particles: SO₂−Mg(OH)₂−MgSO₃ System