CFD study of CO 2 separation in an HFMC: Under non-wetted and partially-wetted conditions

Azari, Ahmad; Abbasi, Mohammad Ali; Sanaeepur, Hamidreza

doi:10.1016/j.ijggc.2016.02.024

Cited by 24 publications

(24 citation statements)

References 32 publications

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“…To estimate the shell radius ( 3 ), Happel's free surface model can be used. Free surface radius (r3) can be calculated by equation ( 4) [6]:…”

Section: Simulationmentioning

confidence: 99%

“…In 2011, Kazemi [5] had a study on the simultaneous transport of CO2 through a HFMC using methyl-di-ethanolamine (MDEA) as chemical absorbent, in which the effect of absorbent (MDEA) concentration, was studied on CO2 removal. In 2016, Azari [6] studied the effect of gas flow rate and liquid flow rate with different chemical absorbents on the function of HFMC system. In the proposed system, the gas phase containing CO2 in the membrane contactor and the liquid phase containing the mono ethanol amine as a suitable chemical adsorbent flow in the opposite direction.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation on the Effect of Flow Parameters in CO2 Capturing Using Aqueous MEA Absorbent in HFMC Systems

2020

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Nowadays, CO2 as the product of fossil fuel combustions, is polluting the air and the human environment, and it causes global warming. To reduce the negative effect of CO2 presence, it should be removed from the air by capturing methods. Hollow fiber membrane contactor (HFMC) system is one of the most efficient method for CO2 capturing than the other feasible capturing methods. In the present paper an HFMC absorbing system has been simulated using COMSOL Multiphysics software and the effect of flow rates of gas and liquid on the amount of CO2 removal has been studied. Aqueous solution of Mono-ethanolamine (MEA) is entered as the absorbent liquid in the tubes, and CO2 is removed from the shell side by the diffusion phenomena by participating in the chemical reaction with MEA. The results show that the higher liquid flow rate the higher %CO2 removal from the inserted gas. Against this result, the percentage of CO2 removal decreases with increasing the gas flow rate as expected. Higher gas flow rate leads the gas velocity to higher values and less possibility of absorbing by the diffusion method. The rate of the CO2 removal variation with liquid flow rate is higher than the CO2 removal variation whit the gas flow rate.

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“…To estimate the shell radius ( 3 ), Happel's free surface model can be used. Free surface radius (r3) can be calculated by equation ( 4) [6]:…”

Section: Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on the Effect of Flow Parameters in CO2 Capturing Using Aqueous MEA Absorbent in HFMC Systems

2020

sjfst

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“…The first H 2 /nitrogen (N 2 ) membrane separation unit in a large-scale industrial plant was implemented by Monsanto in the ammonia purge gas unit in 1980. 38 Aghaeinejad-Meybodi et al 39 have modeled the inorganic silica membranes in cocurrent, countercurrent, and crosscurrent flow conditions in order to optimize the process of H 2 separation from methanol steam reforming products (with CO as a major component). 10,11 H 2 is a small and noncondensable gas with a high diffusion rate in glassy polymers.…”

Section: Introductionmentioning

confidence: 99%

“…For example, HFMCs in nonwetted conditions, which apply hydrophobic membrane materials, showed usually better performances due to low resistance against the species transport through the membrane pores. 38 Aghaeinejad-Meybodi et al 39 have modeled the inorganic silica membranes in cocurrent, countercurrent, and crosscurrent flow conditions in order to optimize the process of H 2 separation from methanol steam reforming products (with CO as a major component). The results showed that by a single-stage silica membrane for H 2 /CO, separation can be obtained high purity of H 2 (99 mol.%, and 0.4 mol.% of CO) at a pressure gradient equal to 3 bar.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen recovery from ammonia purge gas by a membrane separator: A simulation study

Maarefian¹,

Bandehali

Azami

et al. 2019

Int J Energy Res

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Summary In this study, a two‐dimensional mathematical model is proposed for modeling the hollow fiber membrane (HFM) separators for hydrogen (H2) recovery unit implemented in the Razi Petrochemical Company (Imam Khomeini Port, Iran) to capture hydrogen from ammonia (NH3) purge gas. In this regard, computational fluid dynamics is applied to solve the equations of momentum and mass transfer in the laminar flow conditions. Axial and radial diffusion for mass transfer inside the membrane fibers and axial diffusion within the shell side of separator were considered. The distributions of concentration, velocity, and mass transfer fluxes were achieved by the model. As the new insights, the effects of feed flow rate and feed gas concentration on mass transfer of H2 were investigated. Moreover, fluid velocity profile and H2 fluxes in the tube (fiber), membrane, and shell sides of the HFM separator were studied. The results of simulation were compared with the industrial data and showed that the present developed model has excellent agreement with the experimental data with a low mean deviation value of 3.5%.

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“…Thus, preventing or controlling the greenhouse gas emissions—especially the CO 2 emission from flue gases—has become a concern in the industry . Industrial gas separation has been carried out via several methods that membrane separation is one of the most important ones . Membrane separation technology beneficiates from some advantages such as low energy consumption and investment costs as compared to the conventional separation methods.…”

Section: Introductionmentioning

confidence: 99%

Gas permeation modeling of mixed matrix membranes: Adsorption isotherms and permeability models

et al. 2017

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In order to calculate the permeability of gases in mixed matrix membranes (MMMs) filled with porous particles, the first step is to calculate the permeability of filler particles. Because particle pore sizes of the considered sodium zeolite Y (NaY) in this study is greater than the molecular sizes of the tested gases (CO 2 and N 2 ), it is assumed that diffusion of the gases in the zeolite particles is from Knudsen type. Moreover, the gas sorption data (isotherms) were measured experimentally and then fitted with Langmuir and Freundlich model equations to calculate the related constants. Finally, the experimental CO 2 and N 2 permeabilities of cellulose acetate (CA)/NaY MMMs were compared with the corresponding data predicted by the well-known permeability models in this field. It was concluded that the Bruggeman model has better predictions among the other models, especially for the higher particle loadings. POLYM. COMPOS., 00:000-000,

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CFD study of CO 2 separation in an HFMC: Under non-wetted and partially-wetted conditions

Cited by 24 publications

References 32 publications

Numerical Investigation on the Effect of Flow Parameters in CO2 Capturing Using Aqueous MEA Absorbent in HFMC Systems

Numerical Investigation on the Effect of Flow Parameters in CO2 Capturing Using Aqueous MEA Absorbent in HFMC Systems

Hydrogen recovery from ammonia purge gas by a membrane separator: A simulation study

Gas permeation modeling of mixed matrix membranes: Adsorption isotherms and permeability models

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