scholarly journals Optimization of Cyclic Adsorption Processes and Gas Mixture Separation Plants

2021 ◽  
Vol 27 (4) ◽  
pp. 599-614
Author(s):  
E. I. Akulinin ◽  
D. S. Dvoretsky ◽  
S. I. Dvoretsky
Keyword(s):  
Gas Flow ◽  
Reverse Flow ◽  
Initial Information ◽  
Mixture Separation ◽  
Product Gas ◽  
Adsorption Processes ◽  
Separation Of Gas Mixtures ◽  
Pressure Swing ◽  
Degree Of Extraction ◽  
Cyclic Adsorption

The analysis of the cyclic adsorption process and the installation of separation of gas mixtures by the method of pressure swing adsorption as an object of optimization have been carried out. The study found operating (control) variables (the duration of the adsorption stage, the pressure at the compressor outlet, the coefficient of reverse flow for the regeneration of the adsorbent, the program of changes in the opening time of the inlet and outlet valves of the installation); undefined parameters (composition, temperature and pressure of the initial gas-air mixture); output variables of the installation (concentration of oxygen, nitrogen in the product gas flow, the productivity of the installation, the degree of extraction and reduced costs for the production of oxygen with a given purity of 40 - 90 and higher vol.%). A one-stage problem of optimization of the regimes of a stationary periodic process of adsorption separation of atmospheric air and oxygen concentration was formulated and solved by the method of short-cycle adsorption under conditions of partial uncertainty of the initial information in the presence of restrictions on the purity of the product gas, the productivity of the installation and the rate of gas flow in the “frontal layer” of the adsorbent. An iterative algorithm for its solution is proposed.

scholarly journals Numerical study of the dynamics and optimization of the modes of air adsorption separation and oxygen concentration

2019 ◽  
Vol 81 (1) ◽  
pp. 310-317
Author(s):  
E. I. Akulinin ◽  
O. O. Golubyatnikov ◽  
D. S. Dvoretsky ◽  
S. I. Dvoretsky
Keyword(s):  
Oxygen Concentration ◽  
Gas Flow ◽  
Numerical Study ◽  
Air Separation ◽  
Zeolite 13X ◽  
Wide Range ◽  
Cyclic Processes ◽  
Pressure Swing ◽  
Cyclic Adsorption ◽  
Adsorption Desorption

Numerical researches of influence of temperature, composition and pressure changes of the initial gas mixture on the purity, recovery and capacity of the pressure swing adsorption (PSA) unit was made. Air separation dynamics was researches in a wide range of control (pressure at the compressor outlet, the duration of the adsorption – desorption cycle, backflow coefficient, programs of control valves opening degree in time) variables. It was found that the change of regime parameters and the inflow on has a significant impact on the purity and recovery of oxygen. Also was founded that the range of the duration of the adsorption stage and the compressor outlet pressure values should be limited to the intervals of 39-43 s and 2.7–2.8?105 Pa, respectively. The steady-state of the PSA unit mode output time was amount 20-30 cycles of "adsorption-desorption". Formulated and solved the optimization tasks of regime parameters of air separation cyclic processes by criterion of maximum oxygen recovery in 2-bed PSA unit with granular adsorbent zeolite 13X; the optimal values of the control parameters for differential environmental conditions (when the product oxygen concentration not less than 45% vol. and the PSA unit capacity ~2 l/min) are determined. It is shown that the implementation of the optimal of the inlet and discharge valves opening degree changes program in PSA unit allows to provide the set values of the gas flow rate in the "frontal" layer of the adsorbent, in which there is no abrasion of the adsorbent in the cyclic adsorption–desorption processes

scholarly journals Mathematical modelling of cyclic pressure swing adsorption processes

2018 ◽  
Vol 1015 ◽  
pp. 032002 ◽  
Author(s):  
S A Skvortsov ◽  
E I Akulinin ◽  
O O Golubyatnikov ◽  
D S Dvoretsky ◽  
S I Dvoretsky
Keyword(s):  
Mathematical Modelling ◽  
Pressure Swing Adsorption ◽  
Cyclic Pressure ◽  
Adsorption Processes ◽  
Pressure Swing

scholarly journals Adsorption Properties of Modified Clinoptilolite for Methane and Nitrogen

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2024 ◽  
Author(s):  
Xiaofei Hao ◽  
Hongjie Hu ◽  
Zhen Li ◽  
Limei Wu ◽  
Xueqin Liu ◽  
...  
Keyword(s):  
Coalbed Methane ◽  
Pressure Swing Adsorption ◽  
Adsorption Properties ◽  
Unconventional Gas ◽  
Mixture Separation ◽  
Separation Factors ◽  
Methane Mixture ◽  
Equilibrium Separation ◽  
Pressure Swing ◽  
Modified Clinoptilolite

Coalbed methane (CBM) is a kind of unconventional gas. CBM often contains a great deal of air when it comes out of the well. So, it must be condensed and purified before it can be applied. In this paper, raw clinoptilolite (Cp) was treated with grinding, gravimetric concentration, and ion-exchange using different aqueous solutions of salts. Then, the modified Cp powder was prepared into particles as adsorbents. Then, the adsorbents were used for nitrogen/methane separation in pressure swing adsorption (PSA) at the same condition of 0.2 MPa and 298 K. Research results indicated that there were micropores and lots of mesopores in the Cp, and the pores were mainly slit holes formed by sheet stacking. The adsorbents of NH4-Cp, Cs-Cp, and Cu-Cp showed good equilibrium selectivity for CH4, and the equilibrium separation factors of CH4 and N2 were 2.56, 2.31, and 1.95, respectively. The adsorbents of Na-Cp and Ag-Cp showed good equilibrium selectivity for N2, and the equilibrium separation factors of N2 and CH4 were 7.25 and 6.53, respectively. Consequently, the adsorbent of Na-Cp was suitable for nitrogen/methane mixture separation, which could make the concentration of methane concentrated from 19.7% to 30.72%.

Advanced Materials for Separation and Purification of Gas Mixtures in Cyclic Adsorption Processes

2019 ◽  
Vol 10 (5) ◽  
pp. 1185-1190
Author(s):  
N. V. Posternak ◽  
Yu. A. Ferapontov ◽  
L. L. Ferapontova ◽  
E. I. Akulinin ◽  
S. I. Dvoretsky
Keyword(s):  
Gas Mixtures ◽  
Advanced Materials ◽  
Separation And Purification ◽  
Adsorption Processes ◽  
Cyclic Adsorption

Reverse Flow Pressure Limiting Aperture

2000 ◽  
Vol 6 (1) ◽  
pp. 21-30 ◽  
Author(s):  
Gerasimos D. Danilatos
Keyword(s):  
Pressure Difference ◽  
Gas Flow ◽  
Reverse Flow ◽  
Gas Jet ◽  
The Third ◽  
The Core ◽  
Annular Aperture ◽  
Flow Through ◽  
Flow Pressure ◽  
Gas Molecules

The reverse flow pressure limiting aperture is a device that creates and sustains a substantial gas pressure difference between two chambers connected via an aperture. The aperture is surrounded by an annular orifice leading to a third chamber. The third chamber is maintained at a relatively high pressure that forces gas to flow through the annular aperture into the first of said two chambers. The ensuing gas flow develops into a supersonic annular gas jet, the core of which is coaxial with the central aperture. A pumping action is created at the core of the jet and any gas molecules leaking through the aperture from the second chamber are entrained and forced into the first chamber, thus creating a substantial pressure difference between the first and second chamber.

Modeling of Pressure Swing Adsorption Processes

2011 ◽  
pp. 137-172
Author(s):  
Eustathios S. Kikkinides ◽  
Dragan Nikolic ◽  
Michael C. Georgiadis
Keyword(s):  
Pressure Swing Adsorption ◽  
Adsorption Processes ◽  
Pressure Swing
Sign in / Sign up

Export Citation Format

Share Document