Simulation of gas absorption into string-of-beads liquid flow with chemical reaction

Hosseini, SeyedMehrdad; Alizadeh, Reza; Fatehifar, Esmaeil; Alizadehdakhel, Asghar

doi:10.1007/s00231-014-1343-z

Cited by 20 publications

(15 citation statements)

References 21 publications

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“…Therefore, the CO 2 reaction rate can be estimated by . Therefore, this reaction can be simplified as the second-order irreversible reaction for describing the CO 2 absorption process; (ii) this simplification can make the simulation much easier without losing the prediction accuracy at the temperature range for CO 2 absorption; (iii) this simplified method has been extensively employed in the simulations of the CO 2 absorption (Hosseini et al, 2014;Sebastia-Saez et al, 2014;Niegodajew and Asendrych, 2016).…”

Section: Mass Transfermentioning

confidence: 99%

“…The CFD simulation of post combustion CO 2 absorption in PBs/RPBs requires the combination of a flow dynamic, heat transfer, mass transfer and reaction models. In most literature on CO 2 absorption by liquid amine, they share much the same features, and have a similar mass transfer model and a reaction mechanism (Sebastia-Saez et al, 2014;Hosseini, et al, 2014). The novelty in these published literatures are that the new CFD models that accurately describe the multiphase flow in the new reactors.…”

Section: Introductionmentioning

confidence: 99%

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Modelling of CO2 absorption in a rotating packed bed using an Eulerian porous media approach

Xie

Ingham

et al. 2019

Chemical Engineering Science

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Section: Mass Transfermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modelling of CO2 absorption in a rotating packed bed using an Eulerian porous media approach

Xie

Ingham

et al. 2019

Chemical Engineering Science

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“…A later study [5] reported the development and validation of an analytical model for the CO2 absorption performance [27]. Another study [28] developed a numerical model for CO2 absorption by water/monoethanolamine liquid films along a single string and performed a parametric study on absorption efficiency. More recent studies reported numerical fluid dynamics simulation of liquid films in the Kapitza instability regime under high counterflowing gas loads [29].…”

Section: Introductionmentioning

confidence: 99%

Thermohydraulic characteristics of a multi-string direct-contact heat exchanger

Zeng

Sadeghpour

2018

International Journal of Heat and Mass Transfer

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Direct-contact heat exchangers that involve energy exchange between gas and liquid streams have a variety of applications, including waste heat recovery, thermoelectric power plant cooling, and thermal desalination. Directcontact heat exchangers are appealing as they may help mitigate potential corrosion, fouling, and scaling of solid surfaces and enhance heat transfer effectiveness. In this study, we experimentally investigate the thermohydraulic characteristics of an economic lightweight direct-contact heat exchanger that incorporates an array of strings of diameter of the order of 0.1~1 mm to sustain flows of thin liquid films. We constructed a 1.6 m-tall prototype heat exchanger with an array of as many as 112 vertically aligned strings. Thin films of a non-evaporating liquid are flown down the strings by gravity and exchange thermal energy with a counterflowing gas stream. We obtained axial liquid temperature profiles and frictional loss in the gas stream for different combinations of liquid and gas flow rates and two different string pitches. Numerical simulation is also performed to help interpret and indirectly validate our experimental results. The overall, gas-side, and liquid-side heat transfer coefficients extracted from the experimentally measured temperature profiles are examined to evaluate the impact of instability in liquid film flows and inter-bead spacing. The applicability of the Reynolds analogy is also assessed using the measured gasstream pressure drops and air-side heat transfer coefficients. The present study helps improve our understanding of heat transfer and gas-stream pressure drop in string-based direct-contact heat exchangers and provides an experimental database to help systematically optimize their design. KEY WORDS: Direct-contact heat exchanger, interfacial heat transfer, dry cooling, thin film flows Liquid films develop wavy patterns as they flow down strings Gas streams (in) Fan Gas streams (out)

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“…Therefore, the liquid is forced to run on defined flow paths and no radial flow occurs that could lead to maldistribution. Many researches have been done to study the interphase mass or heat transfer for such wetted‐wire when applied in gas separation . Grunig et al used the watch chain, armor chain, bead chain and locking wire to improve the liquid flow pattern on the surface of the wire.…”

Section: Introductionmentioning

confidence: 99%

Liquid‐bridge flow in the channel of helical string and its application to gas–liquid contacting process

Cong

Zhao

et al. 2018

AIChE Journal

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To solve the problems of the traditional packings, such as high pressure drop, mal-distribution and short liquid residence time, a helical flow structured packings was proposed. Two different flow patterns, liquid-bridge flow and liquiddrop flow were identified when the width of the channel of the helical string was adjusted. Moreover, the characteristics of the helical liquid-bridge flow including maximum liquid loading, mean thickness of liquid film, mean residence time and effective specific surface area, were examined. And the separation efficiency was studied by the lab-scale distillation column. In comparison, the effective specific surface area of the helical flow type packings is almost as large as the traditional B1-350Y structured packings, but with thinner liquid film, longer liquid residence time and finally higher separation efficiency.

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Simulation of gas absorption into string-of-beads liquid flow with chemical reaction

Cited by 20 publications

References 21 publications

Modelling of CO2 absorption in a rotating packed bed using an Eulerian porous media approach

Modelling of CO2 absorption in a rotating packed bed using an Eulerian porous media approach

Thermohydraulic characteristics of a multi-string direct-contact heat exchanger

Liquid‐bridge flow in the channel of helical string and its application to gas–liquid contacting process

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