Numerical prediction of CO2 capture process by a single droplet in alkaline spray

Chen, Wei‐Hsin; Tsai, Ming-Hang; Hung, Chen-I

doi:10.1016/j.apenergy.2013.03.082

Cited by 18 publications

(5 citation statements)

References 39 publications

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“…The solvent evaporation phase plays a key role in the particle formation process . Four main techniques were used in these studies: observation of a single droplet in a quiescent gas, − where one isolated droplet evaporates falling or while levitated, typically in a room temperature environment; analysis of droplets suspended from thin filaments, where several droplets evaporate while attached to a wire; − observation of a single droplet falling in a gas flow, − where only one droplet evaporates in an air flow; and studies on monodisperse free falling droplets, − where a chain of droplets is injected into a gas flow. Several theoretical models have been developed that describe the process of evaporating single droplets falling in a gas flow ,− and evaporation of droplets in a monodisperse chain. ,, …”

Section: Introductionmentioning

confidence: 99%

Analysis of the Particle Formation Process of Structured Microparticles

et al. 2015

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The particle formation process for microparticles of cellulose acetate butyrate dried from an acetone solution was investigated experimentally and theoretically. A monodisperse droplet chain was used to produce solution microdroplets in a size range of 55-70 μm with solution concentrations of 0.37 and 10 mg/mL. As the droplets dried in a laminar air flow with a temperature of 30, 40, or 55 °C, the particle formation process was recorded by two independent optical methods. Dried particles in a size range of 10-30 μm were collected for morphology analysis, showing hollow, elongated particles whose structure was dependent on the drying gas temperature and initial solution concentration. The setup allowed comprehensive measurements of the particle formation process to be made, including the period after initial shell formation. The early particle formation process for this system was controlled by the diffusion of cellulose acetate butyrate in the liquid phase, whereas later stages of the process were dominated by shell buckling and folding.

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Section: Introductionmentioning

confidence: 99%

Analysis of the Particle Formation Process of Structured Microparticles

et al. 2015

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“…Aqueous ammonia was used as the absorbent, and the gas phase was a mixture of N 2 and CO 2 . The gas concentration was uniform across any cross section of the reactor, and the average CO 2 concentration on the liquid-side interface was assumed to be proportional to the free stream gas concentration C g,s ∼ HC g ; this assumption is valid because CO 2 diffusion in the gas phase is much faster than the chemical absorption inside the droplet . Physical and chemical properties were constant, H was expressed as a function of temperature, and the reaction rate constant k was borrowed from refs and .…”

Section: Methods For Experimentation and Analysismentioning

confidence: 99%

Novel Spray Tower for CO₂ Capture Using Uniform Spray of Monosized Absorbent Droplets

Cho

Lee

Choi³

et al. 2018

Ind. Eng. Chem. Res.

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Conventional spray towers emit absorbent droplets that are nonuniform in size and spatial distribution; as a result, capture efficiency is degraded. This paper presents the design and evaluation of a novel spray tower for capturing CO2 with much increased capture efficiency. The tower uses a multinozzle plate, and can spray sorbent drops of almost the same size vertically and quite uniformly across the flow cross section. Uniform size and spatial distribution of droplets greatly increased the capture efficiency η, although much bigger drops were used, achieving η ∼ 95%, which has rarely been reported to date for CO2 capture by a spray tower. Experimental results were compared with the predictions by numerical simulations in excellent agreement. The new spray tower has a number of strong points that are favorable for scaling up of diameter and length.

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“…Aqueous NH 3 was used as the absorbent, and the gas phase was a mixture of N 2 and CO 2 . Gas concentration was uniform at any cross section of the reactor, and average CO 2 concentration on the liquid-side interface was assumed to be proportional to the free stream gas concentration C g,s ≈ H C g ; this assumption is valid because CO 2 diffusion in the gas phase is much faster than the chemical absorption inside the droplet . Physical and chemical properties were constant, H was expressed as a function of temperature, and reaction rate constant k was borrowed from .…”

Section: Methods To Simulate Efficiency Of Co2 Capturementioning

confidence: 99%

Upper-Bound Efficiency of Spray Towers To Capture CO₂ Using Polydispersed NH₃ Droplets

Cho

Choi²,

Lee

et al. 2017

Ind. Eng. Chem. Res.

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Chemical absorption of CO2 with aqueous NH3 was numerically analyzed in an Eulerian manner for steady 1D spray towers in which gas velocity and liquid flow were uniform, and the results were formulated into a universal correlation. The capture efficiency η predicted by the proposed correlation is a sort of upper bound, and can be used as a base to evaluate the optimality of each design. Drop-size poly dispersity was considered; a spray of poly dispersed droplets was found to be equivalent in η to a spray of monodispersed droplets of an equivalent diameter, and a general formula for the equivalent size was attained in terms of mean size and geometric standard deviation. Total mass transfer coefficient was linearly proportional to the gas–liquid flow rate ratio, and the efficiency correlation agreed well with published results.

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Numerical prediction of CO2 capture process by a single droplet in alkaline spray

Cited by 18 publications

References 39 publications

Analysis of the Particle Formation Process of Structured Microparticles

Analysis of the Particle Formation Process of Structured Microparticles

Novel Spray Tower for CO₂ Capture Using Uniform Spray of Monosized Absorbent Droplets

Upper-Bound Efficiency of Spray Towers To Capture CO₂ Using Polydispersed NH₃ Droplets

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Numerical prediction of CO2 capture process by a single droplet in alkaline spray

Cited by 18 publications

References 39 publications

Analysis of the Particle Formation Process of Structured Microparticles

Analysis of the Particle Formation Process of Structured Microparticles

Novel Spray Tower for CO2 Capture Using Uniform Spray of Monosized Absorbent Droplets

Upper-Bound Efficiency of Spray Towers To Capture CO2 Using Polydispersed NH3 Droplets

Contact Info

Product

Resources

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Novel Spray Tower for CO₂ Capture Using Uniform Spray of Monosized Absorbent Droplets

Upper-Bound Efficiency of Spray Towers To Capture CO₂ Using Polydispersed NH₃ Droplets