scholarly journals CFD Simulation for Separation of Carbon Dioxide-Methane Mixture by Pressure Swing Adsorption

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
K. Rambabu ◽  
L. Muruganandam ◽  
S. Velu
Keyword(s):  
Carbon Dioxide ◽  
Flow Rate ◽  
Pressure Swing Adsorption ◽  
Cfd Simulation ◽  
Separation Efficiency ◽  
Carbon Dioxide Concentration ◽  
Operating Conditions ◽  
Analytical Models ◽  
Feed Mixture ◽  
Pressure Swing

A developing technology for gas separations is pressure swing adsorption, which has been proven to be more economical and energy efficient compared to other separation methods like cryogenic distillation and membrane separation. A pressure swing adsorption (PSA) column, with carbon dioxide-methane as feed mixture and 6-FDA based polyimides as the adsorbent, was modeled and simulated in this work. Ansys Fluent 12.1, along with supplementary user defined functions, was used to develop a 2D transient Eulerian laminar viscous flow model for the PSA column. The model was validated by comparing the simulated results with established analytical models for PSA. The developed numerical model was used to determine the carbon dioxide concentration in the column as a function of time based on different operating conditions. Effect of various operating parameters like pressure, temperature, and flow rate on the separation efficiency has been studied and reported. Optimization studies were carried out to obtain suitable operating conditions for the feed gases separation. Simulation studies were carried out to determine the separation length required for complete separation of the feed mixture corresponding to different inlet feed concentrations which were entering the column at a given flow rate.

scholarly journals Simulation study of pressure swing adsorption to purify helium using zeolite 13X

2020 ◽  
Vol 3 (1) ◽  
pp. 1
Author(s):  
Ehsan Javadi Shokroo ◽  
Mehdi Farniaei ◽  
Mehdi Baghbani
Keyword(s):  
Flow Rate ◽  
Pressure Swing Adsorption ◽  
Gaseous Mixture ◽  
Operating Conditions ◽  
Feed Flow Rate ◽  
Zeolite 13X ◽  
Adsorption Step ◽  
Fully Implicit ◽  
Wide Range ◽  
Pressure Swing

A two-bed pressure swing adsorption system on a commercial type of zeolite 13X adsorbent has been studied numerically over a wide range of operating conditions to helium separation from gaseous mixture. The model includes energy, mass and momentum balances. The coupled partial differential equations are solved using fully implicit forth order Rung-Kutta scheme in the simulation. The effects of adsorption step pressure, adsorption step time and feed flow rate on the helium purity and recovery were investigated. Results shown that as the adsorption step pressure increases the helium purity will be increased. In addition, the helium recovery increases, and the helium purity decreases when the feed flow rate increases. Finally, the simulation results indicated a very good agreement with some current literature experimental work.

scholarly journals Simulation Study of Pressure Swing Adsorption to Purify Helium Using Zeolite 13X

2019 ◽  
Vol 2 (1) ◽  
Author(s):  
Ehsan Javadi Shokroo ◽  
Mehdi Farniaei ◽  
Mehdi Baghbani
Keyword(s):  
Flow Rate ◽  
Pressure Swing Adsorption ◽  
Gaseous Mixture ◽  
Operating Conditions ◽  
Feed Flow Rate ◽  
Zeolite 13X ◽  
Adsorption Step ◽  
Fully Implicit ◽  
Wide Range ◽  
Pressure Swing

A two-bed pressure swing adsorption system on a commercial type of zeolite 13X adsorbent has been studied numerically over a wide range of operating conditions to helium separation from gaseous mixture. The model includes energy, mass and momentum balances. The coupled partial differential equations are solved using fully implicit forth order Rung-Kutta scheme in the simulation. The effects of adsorption step pressure, adsorption step time and feed flow rate on the helium purity and recovery were investigated. Results shown that as the adsorption step pressure increases the helium purity will be increased. In addition, the helium recovery increases, and the helium purity decreases when the feed flow rate increases. Finally, the simulation results indicated a very good agreement with some current literature experimentally work.

A Novel Constant Bias Flow Rate CPAP Mask for OSA Therapy Treatments

2006 ◽  
Author(s):  
Z. F. Zhang ◽  
A. M. Al-Jumaily
Keyword(s):  
Carbon Dioxide ◽  
Flow Rate ◽  
Positive Airway Pressure ◽  
Carbon Dioxide Concentration ◽  
Cpap Therapy ◽  
Constant Bias ◽  
Obstructive Sleep ◽  
Bias Flow ◽  
Flow Through ◽  
Pressure Swing

Continuous positive airway pressure (CPAP) therapy is considered the most effective treatment for patients with Obstructive Sleep Apnea (OSA) symptom. A CPAP mask is the interface between the patient and the CPAP humidifier, which contains a series of orifice to circulate the air and ensure that the expired carbon dioxide from the patient's breathing is not rebreathed. The flow through those orifices is called bias flow. For the existing CPAP mask, this bias flow rate increases as the CPAP pressure increases. This raised bias flow rate usually causes a bigger pressure swing inside the mask when the patient is breathing, which is unfavorable for OSA therapy due to the much bigger breathing load required. However, a minimum bias flow rate needs to be maintained inside the mask in order to keep carbon dioxide concentration low. Therefore, this paper introduces a novel mask that can produce a relatively constant bias flow rate (CBFR) over a CPAP range of 0-20cm H2O. Dynamic response tests have proved that this CBFR mask can constrict the mask pressure swing by an order of two so as to offer better comfort for OSA patients.

Adsorption of Carbon Dioxide on Monoethanolamine (MEA)–Impregnated Kenaf Core Fiber by Pressure Swing Adsorption System (PSA)

2014 ◽  
Vol 68 (5) ◽  
Author(s):  
Nabilah Zaini ◽  
Khairul Sozana Nor Kamarudin
Keyword(s):  
Carbon Dioxide ◽  
Carbon Capture ◽  
Pressure Swing Adsorption ◽  
Co2 Adsorption ◽  
Carbon Capture And Storage ◽  
Freundlich Isotherm ◽  
Industrial Applications ◽  
Sem Analysis ◽  
Impregnation Method ◽  
Pressure Swing

Emission of carbon dioxide (CO2) becomes a major concern in combating issues of global warming. The strategy to reduce the concentration of CO2 could be achieved by executing carbon capture and storage (CCS) technology such as adsorption. This study presents the used of kenaf as a green source for CO2 adsorption material. The modification of MEA on kenaf is a novelty work to enhance the capacity of adsorbent since MEA has been proved to have potential in separating CO2 in industrial applications. In this work, 10 wt % of MEA has been impregnated on kenaf via wet impregnation method. The adsorption of CO2 study was conducted by passing CO2/N2 mixture in a ratio of 30:70 in a Pressure Swing Adsorption (PSA) system with a pressure up to 1.5 bar at ambient temperature. Result obtained via SEM analysis shows that the morphology of kenaf was affected after modification with MEA. However, the presence of MEA on kenaf has improved the CO2 adsorption capacity by 16 %. In addition, the adsorption equilibrium data for kenaf and MEA modified kenaf are well fitted in Freundlich isotherm model at low pressure and well fitted in Langmuir model at higher pressure. This study indicates that the introduction of MEA on kenaf could enhance the CO2 adsorption process.  

CFD Investigation of Downhole Natural Gas Separation Efficiency in the Churn Flow Regime

2021 ◽  
Author(s):  
Charles Okafor ◽  
Patrick Verdin ◽  
Phill Hart
Keyword(s):  
Natural Gas ◽  
Flow Regime ◽  
Gas Separation ◽  
Separation Efficiency ◽  
Operating Conditions ◽  
Analytical Models ◽  
Design Stage ◽  
Average Error ◽  
Multiphase Model ◽  
Churn Flow

Abstract Downhole Natural Gas Separation Efficiency (NGSE) is flow regime dependent, and current analytical models in certain conditions lack accuracy. Downhole NGSE was investigated through 3D Computational Fluid Dynamics (CFD) transient simulations for pumping wells in the Churn flow regime. The Volume of Fluid (VOF) multiphase model was considered along with the k – ε turbulence model for most simulations. A mesh independence study was performed, and the final model results validated against experimental data, showing an average error of less than 6 %. Numerical simulation results showed that the steady state assumption used by current mathematical models for churn flow can be inaccurate. Several key parameters affecting the NGSE were identified, and suggestions for key improvements to the widely used mathematical formulations for viscous flow provided. Sensitivity studies were conducted on fluid/geometric parameters and operating conditions, to gain a better understanding of the influence of each parameter on NGSE. These are important results as they equip the ESP engineer with additional knowledge to maximise the NGSE from design stage to pumping operations.

scholarly journals Carbon dioxide removal from compressed air by pressure swing adsorption.

1987 ◽  
Vol 13 (2) ◽  
pp. 139-144 ◽  
Author(s):  
Masaomi Tomomura ◽  
Syunsuke Nogita ◽  
Kazuo Someya
Keyword(s):  
Carbon Dioxide ◽  
Pressure Swing Adsorption ◽  
Carbon Dioxide Removal ◽  
Compressed Air ◽  
Pressure Swing
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