Investigation of Flue Gas and Natural Gas Separation Using Silica Composite Membranes Formed on Porous Alumina Support

2017 ◽  
pp. 573-582
Author(s):  
Ngozi Nwogu ◽  
Ifeyinwa Orakwe ◽  
Edward Gobina
Keyword(s):  
Natural Gas ◽  
Gas Separation ◽  
Flue Gas ◽  
Porous Alumina ◽  
Composite Membranes ◽  
Alumina Support ◽  
Silica Composite

Fabrication and Microstructure of ZnO-TiO2 Composite Membranes by a Reverse Micelle and Sol-Gel Processing

2006 ◽  
Vol 510-511 ◽  
pp. 786-789 ◽  
Author(s):  
Dong Sik Bae ◽  
Byung Ik Kim ◽  
Kyong Sop Han
Keyword(s):  
Particle Size ◽  
Reverse Micelle ◽  
Porous Alumina ◽  
Sol Gel ◽  
Average Particle Size ◽  
Composite Membranes ◽  
Dip Coating ◽  
Narrow Particle Size Distribution ◽  
Average Particle ◽  
Alumina Support

ZnO-TiO2 nanoparticles were synthesized by a reverse micelle and sol-gel process. The average particle size of the colloid was below 30 nm and well dispersed in the solution. ZnOTiO2 composite membranes were fabricated by using the dip-coating method on a porous alumina support. ZnO-TiO2 composite membranes showed a crack-free microstructure and narrow particle size distribution even after the heat treatment up to 600°C. The average particle size of the membrane was 30-40nm, and the pore size of ZnO-TiO2 composite membrane was below 10 nm.

H2/CO2 Gas Separation Characteristic of Zeolite Membrane at High Temperature

2007 ◽  
Vol 26-28 ◽  
pp. 267-270
Author(s):  
Woo Teck Kwon ◽  
Soo Ryong Kim ◽  
Eun Bi Kim ◽  
Seong Youl Bae ◽  
Y. Kim
Keyword(s):  
Gas Separation ◽  
Coal Gasification ◽  
Hydrothermal Reaction ◽  
Low Cost ◽  
Porous Alumina ◽  
Hydrogen Permeability ◽  
Combined Cycle ◽  
Zeolite Membrane ◽  
Alumina Support ◽  
Zeolite Membranes

Due to the need for CO2 sequestration associated with H2 production from fossil fuels, zeolite membrane are very promising due to their low cost, high stability and high permeance. Recently, the faujasite(FAU), the silica/aluminophophate(SAPO-4) framework family of zeolite have been studied for CO2 gas separation. In our study, ZSM-5 membrane was prepared on the porous alumina support using a hydrothermal technique. The thickness of zeolite membrane was controlled by the hydrothermal reaction time and temperature. The prepared zeolite membranes were characterized with SEM and thin film XRD. The hydrogen permeability and selectivity toward carbon dioxide gas were 0.6x 10-6 mole/m2.s.pa and 3.16, respectively. The hydrogen selective zeolite membranes show promising application in hydrogen separation from coal gasification such as Integrated Gasification Combined Cycle (IGCC).

Structure and gas separation properties of ultra-smooth PE-CVD silicon organic coated composite membranes

2021 ◽  
pp. 127338
Author(s):  
Lara Kleines ◽  
Stefan Wilski ◽  
Philipp Alizadeh ◽  
Jens Rubner ◽  
Matthias Wessling ◽  
...  
Keyword(s):  
Gas Separation ◽  
Composite Membranes

PDMS–silica composite membranes with silane coupling for propylene separation

2009 ◽  
Vol 344 (1-2) ◽  
pp. 211-218 ◽  
Author(s):  
Haesook Kim ◽  
Hyun-Gi Kim ◽  
Sooyeon Kim ◽  
Sung Soo Kim
Keyword(s):  
Composite Membranes ◽  
Silica Composite ◽  
Silane Coupling

Xenon recovery from natural gas by hybrid method based on gas hydrate crystallisation and membrane gas separation

2021 ◽  
Vol 86 ◽  
pp. 103740
Author(s):  
Maria S. Sergeeva ◽  
Nikita A. Mokhnachev ◽  
Dmitry N. Shablykin ◽  
Andrey V. Vorotyntsev ◽  
Dmitriy M. Zarubin ◽  
...  
Keyword(s):  
Natural Gas ◽  
Gas Separation ◽  
Hybrid Method ◽  
Gas Hydrate ◽  
Membrane Gas Separation

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.

Numerical Simulations of Turbulent Mixing and Autoignition of Hydrogen Fuel at Reheat Combustor Operating Conditions

2011 ◽  
Author(s):  
Elizaveta Ivanova ◽  
Berthold Noll ◽  
Peter Griebel ◽  
Manfred Aigner ◽  
Khawar Syed
Keyword(s):  
Natural Gas ◽  
Numerical Simulations ◽  
Flue Gas ◽  
Turbulent Mixing ◽  
Turbulence Modeling ◽  
Numerical Study ◽  
Operating Conditions ◽  
Fuel Blend ◽  
Flow Configuration ◽  
Modeling Methods

Turbulent mixing and autoignition of H2-rich fuels at relevant reheat combustor operating conditions are investigated in the present numerical study. The flow configuration under consideration is a fuel jet perpendicularly injected into a crossflow of hot flue gas (T > 1000K, p = 15bar). Based on the results of the experimental study for the same flow configuration and operating conditions two different fuel blends are chosen for the numerical simulations. The first fuel blend is a H2/natural gas/N2 mixture at which no autoignition events were observed in the experiments. The second fuel blend is a H2/N2 mixture at which autoignition in the mixing section occurred. First, the non-reacting flow simulations are performed for the H2/natural gas/N2 mixture in order to compare the accuracy of different turbulence modeling methods. Here the steady-state Reynolds-averaged Navier-Stokes (RANS) as well as the unsteady scale-adaptive simulation (SAS) turbulence modeling methods are applied. The velocity fields obtained in both simulations are directly validated against experimental data. The SAS method shows better agreement with the experimental results. In the second part of the present work the autoignition of the H2/N2 mixture is numerically studied using the 9-species 21-steps reaction mechanism of O’Conaire et al. [1]. As in the reference experiments, autoignition can be observed in the simulations. Influences of the turbulence modeling as well as of the hot flue gas temperature are investigated. The onset and the propagation of the ignition kernels are studied based on the SAS modeling results. The obtained numerical results are discussed and compared with data from experimental autoignition studies.

Sign in / Sign up

Export Citation Format

Share Document