scholarly journals CFD Modelling of a Hollow Fibre Membrane for CO2 Removal by Aqueous Amine Solutions of MEA, DEA and MDEA

2016 ◽  
Vol 14 (1) ◽  
pp. 53-61 ◽  
Author(s):  
Sina Gilassi ◽  
Nejat Rahmanian
Keyword(s):  
Mass Transfer ◽  
Flow Rate ◽  
Mass Transfer Rate ◽  
Hollow Fibre ◽  
Operating Conditions ◽  
Transfer Model ◽  
Co2 Removal ◽  
Hollow Fibre Membrane ◽  
Fibre Membrane ◽  
Amine Solutions

AbstractA mass transfer model was developed to capture CO2 from a gas mixture in hollow fibre membrane contactors under laminar flow conditions. The axial and radial diffusions through membrane and convection in tube and shell sides with chemical reaction were investigated. COMSOL software was used to numerically solve a system of non-linear equations with boundary conditions by use of the finite element method. Three different amine solutions of monoethanolamine (MEA), diethanolamine (DEA) and n-methyldiethanolamine (MDEA) were chosen as absorbent in lumen to consider the mass transfer rate of CO2 and its removal efficiency. The modelling results were compared with experimental data available in the literature and a good agreement was observed. The CFD results revealed that MEA had the best performance for CO2 removal as compared to DEA and MDEA under various operating conditions due to the different CO2 loading factor of absorbents. Furthermore, efficiency of CO2 removal was highly dependent on the absorbent concentration and flow rate, increasing of the gas flow rate caused a reduction in gas residence time in the shell and consequently declined CO2 mass transfer. The modelling results showed the effect of absorbent concentration on the CO2 mass transfer was improved due to availability of absorbent reactants at the gas-liquid interface.

Numerical investigation of the effects of polypropylene hollow fibre membrane structure on the performance of CO2 removal from flue gas

RSC Advances ◽  
2015 ◽  
Vol 5 (1) ◽  
pp. 424-433 ◽  
Author(s):  
Li Zhang ◽  
Zi-Yi Qu ◽  
Yun-Fei Yan ◽  
Shun-Xiang Ju ◽  
Zhi-En Zhang
Keyword(s):  
Carbon Dioxide ◽  
Numerical Investigation ◽  
Flue Gas ◽  
Membrane Structure ◽  
Hollow Fibre ◽  
Co2 Removal ◽  
Hollow Fibre Membrane ◽  
Highly Efficient ◽  
Fibre Membrane ◽  
Membrane Contactors

Carbon dioxide (CO2) absorption from flue gas by hollow fibre membrane contactors is considered as a clean, highly efficient and promising decarburisation technique.

Application of hollow fibre membrane reactor for biological removal of H2S

2020 ◽  
Author(s):  
Jewel Das ◽  
Harish Ravishankar ◽  
Piet Lens
Keyword(s):  
Mass Transfer ◽  
Membrane Surface ◽  
Hollow Fibre ◽  
Microbial Community Analysis ◽  
Rayon Production ◽  
Membrane Area ◽  
Hollow Fibre Membrane ◽  
Fibre Membrane ◽  
Physico Chemical ◽  
Biological Methods

<p>Hydrogen sulfide (H<sub>2</sub>S) is a toxic pollutant and harmful to human health. Industries such as pulp and paper manufacturing, rayon production, natural gas extraction and refining, and crude petroleum refineries generate waste gas streams with high H<sub>2</sub>S concentrations. Both physico-chemical and biological methods are used for H<sub>2</sub>S removal from the gas stream. Biological methods offer several advantages such as environmental friendly, less expensive and require simple operation and maintenance compared to physico-chemical methods. In this study, a hydrophilic hollow fibre membrane (HFM) based bioreactor configuration has been tested for biological H<sub>2</sub>S removal. Three reactors were fabricated and operated for ~ 3 months where two reactors were used for biological conversion process and the third reactor was used for abiotic process. The effective membrane area of a HFM module used in each reactor was 0.0138 m<sup>2</sup>. The bioreactors demonstrated efficient gas-liquid mass transfer through the HFM module and achieved ~ 99% removal efficiency with an elimination capacity of ~ 17.0 g m<sup>-3</sup> h<sup>-1</sup>. The H<sub>2</sub>S flux of the bioreactor was ~ 0.20 g m<sup>-2</sup> day<sup>-1</sup> which was ~ 9 times higher than the abiotic reactor for an inlet H<sub>2</sub>S concentration of ~ 0.90 g m<sup>-3</sup>. The overall mass transfer coefficient value for the biotic process was 17.2 µm s<sup>-1</sup> which was ~ 25 times higher than the abiotic process. The bioreactors demonstrated both microbial attached growth on the membrane surface and suspended growth in the liquid phase. Microbial community analysis confirmed the presence of diverse sulfur-oxidizing bacteria at genus level including <em>Acinetobacter</em>, <em>Dechloromonas</em>, <em>Hydrogenophaga</em>, <em>Rhodopseudomonas</em> and <em>Sulfurospirillum</em>. Moreover, the enrichment of other bacterial genera such as ammonia-oxidizing (e.g. <em>Nitrosospira</em>), organic matter degrading (e.g. <em>Trichococcus</em>) and methanogenic (e.g. <em>Methanosaeta</em>) microorganisms demonstrate the diverse microbial ecology of the sludge growing in the bioreactor.</p>

Enzymatic peroxycarboxylic acid formation in a hollow-fibre membrane reactor: kinetics and mass transfer

1994 ◽  
Vol 22 (3) ◽  
pp. 537-547 ◽  
Author(s):  
G.F.H. Kramer ◽  
S.Th. Bouwer ◽  
R.W. van Gemert ◽  
J.T.P. Derksen ◽  
F.P. Cuperus
Keyword(s):  
Mass Transfer ◽  
Membrane Reactor ◽  
Hollow Fibre ◽  
Acid Formation ◽  
Hollow Fibre Membrane ◽  
Reactor Kinetics ◽  
Fibre Membrane

Preliminary Study on Biomitigation Green House Gas Carbon Dioxide in Closed System Bubble Photobioreactor: Relationship Among the Mass Transfer Rate and CO2 Removal Efficiency in High Level of CO2

2014 ◽  
Vol 69 (6) ◽  
Author(s):  
Astri Rinanti ◽  
Kania Dewi ◽  
Dea Indriani Astuti ◽  
Nico Halomoan
Keyword(s):  
Carbon Dioxide ◽  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Removal Efficiency ◽  
Flow Rate ◽  
Mass Transfer Rate ◽  
Co2 Concentration ◽  
Co2 Removal ◽  
Co2 Removal Efficiency

Emission of carbon dioxide (CO2) is a major contributor to global warming. Biofixation of CO2 by microalgae in photobioreactors seems to be a promising strategy for CO2 mitigation. The research to determine the overall mass transfer coefficient (kLa) has been done to find the way on biomitigation CO2 emission by using biologically Carbon Capture and Sequestration method. This research was conducted according to green microalgae Scenedesmus obliquus activity, which is cultivated in a bubble photobioreactor through the mass transfer process that assumed adequate mixing occurs. Flow rate of CO2 that supplied to the system were 2 L/min, 5 L/min and 8 L/min, when each rate flowed into the photobioreactor with high CO2 concentration (v/v) of 2%, 5% and 10%. The highest CO2 removal efficiency occurred at culture that supplied with an CO2-enriched air flow rate of 5 L/min. The kLa (CO2) value is the highest in 0.3582/day at 2% CO2 concentration and flow rate of 2 L/min, while the lowest is in 0.0503/day at 5% CO2 concentration and flow rate of 8 L/min. In terms of solubility is inversely proportional to the flow rate, the less carbon dioxide is dissolved at the rate of 8 L/min as well as the value of the kLa. The results showed that the variation of flow rate will affect the amount of mass transfer coefficient, growth rate and cell biomass.  Higher flow rate decreases kLa value as well as CO2 removal efficiency.

scholarly journals Theoretical and Computational Analysis on Double-End Submerged Hollow Fibre Membrane Modules

Energies ◽  
2018 ◽  
Vol 11 (5) ◽  
pp. 1042 ◽  
Author(s):  
Keng Lim ◽  
Hui An ◽  
Peng Wang ◽  
Guiqin Liu ◽  
Simon Yu
Keyword(s):  
Membrane Permeability ◽  
Flow Rate ◽  
Hollow Fibre ◽  
Design Stage ◽  
Membrane Thickness ◽  
Characteristic Ratio ◽  
Hollow Fibre Membrane ◽  
Fibre Membrane ◽  
Output Flow ◽  
Inner Diameter

This paper studies the potential increase in permeate output flow rate that submerged hollow fibres can achieve when operating in double-end suction. The flow dynamics of submerged hollow fibre membranes with different combinations of fibre inner diameter, membrane thickness, and membrane permeability were numerically simulated. Fibre features (fibre inner diameter, membrane thickness, and membrane permeability) are then characterised for their effects on the increment in permeate flow rate due to change in configuration. Concurrently, an analytical model of a fibre in double-end suction is modelled. Analysis on the double-end fibre model has indicated that the fibre characteristic ratio, λ, has a direct influence on the relative increase in output flow rate when both ends are open. Parametric investigations on the three fibre features have shown that their effects on relative output increase agree with the co-relations indicated by λ. For fibres with λ less than 4, a proportional relationship between a fibre’s λ value and the percentage increment in permeate flow rate is observed when adopting double-end suction. The fibre characteristic ratio, λ, in addition to characterising flux uniformity, can further be used to consider the effectiveness of applying double-end suction in Submerged Hollow Fibre Membrane Module (SHFMM) systems at the design stage.

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