Study of a novel rapid vacuum pressure swing adsorption process with intermediate gas pressurization for producing oxygen

Zhu, Xianqiang; Liu, Yingshu; Yang, Xiong; Liu, Wenhai

doi:10.1007/s10450-016-9843-4

Cited by 29 publications

(28 citation statements)

References 26 publications

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“…For the candidate adsorbents considered, the equilibrium loading capacity of oxygen and nitrogen are obtained from experimental data in literature. Specifically, the equilibrium data for LiX, LiLSX and 5A zeolites are obtained from Rege and Yang 25 , Zhu et al 13 and Talu et al 26 , respectively. A nonlinear programming formulation is then solved to fit the dual-site Langmuir adsorption isotherms on experimental data wherein the objective function is to minimize the mean squared error.…”

Section: Resultsmentioning

confidence: 99%

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Flexible oxygen concentrators for medical applications

Arora

Hasan

2021

Sci Rep

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Medical oxygen concentrators (MOCs) are used for supplying medical grade oxygen to prevent hypoxemia-related complications related to COVID-19, chronic obstructive pulmonary disease (COPD), chronic bronchitis and pneumonia. MOCs often use a technology called pressure swing adsorption (PSA), which relies on nitrogen-selective adsorbents for producing oxygen from ambient air. MOCs are often designed for fixed product specifications, thereby limiting their use in meeting varying product specifications caused by a change in patient’s medical condition or activity. To address this limitation, we design and optimize flexible single-bed MOC systems that are capable of meeting varying product specification requirements. Specifically, we employ a simulation-based optimization framework for optimizing flexible PSA- and pressure vacuum swing adsorption (PVSA)-based MOC systems. Detailed optimization studies are performed to benchmark the performance limits of LiX, LiLSX and 5A zeolite adsorbents. The results indicate that LiLSX outperforms both LiX and 5A, and can produce 90% pure oxygen at 21.7 L/min. Moreover, the LiLSX-based flexible PVSA system can manufacture varying levels of oxygen purity and flow rate in the range 93–95.7% and 1–15 L/min, respectively. The flexible MOC technology paves way for transitioning to an envisioned cyber-physical system with real-time oxygen demand sensing and delivery for improved patient care.

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Section: Resultsmentioning

confidence: 99%

“… TPD . Zhu et al 13 devised a rapid PVSA process with intermediate pressurization steps using LiLSX zeolite and observed that lower desorption pressure levels help in lowering BSF and increasing oxygen recovery. The developed test unit produced 90% pure oxygen at 0.75 L/min with a BSF of 82.8 kg ads.…”

Section: Introductionmentioning

confidence: 99%

Flexible oxygen concentrators for medical applications

Arora

Hasan

2021

Sci Rep

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“…By lowering the requirement for oxygen purity, generating more oxygen in the same equipment can decrease operational costs, lower the scale of the equipment, and thus save the initial investment. For instance, oxygen purity of 80% can meet a lot of industrial requirements [25].…”

Section: Effect Of Product Flow Rate On Oxygen Generation Performancementioning

confidence: 99%

“…Numerical simulation is a very effective method to study the PSA process of oxygen generation [22][23][24][25][26]. However, most of the studies are based on the 1-D assumption, while in actual PSA processes there are often inconsistencies perpendicular to the flow direction [27,28].…”

Section: Introductionmentioning

confidence: 99%

Two-Dimensional Modeling of Pressure Swing Adsorption (PSA) Oxygen Generation with Radial-Flow Adsorber

et al. 2019

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Radial flow is an important type of flow direction for large-scale pressure swing adsorption (PSA) oxygen generation systems. In this study, a numerical simulation of a PSA oxygen generation process based on radial-flow adsorbers was performed with two-dimensional CFD modeling. The gas distribution, the maldistribution factor and the pressure difference were comparatively investigated at each flow type of the radial-flow adsorber. Considering the gas adsorption performance, the results indicated that the centripetal π-flow radial adsorber has the best flow characteristics for the PSA process. The oxygen purity distribution within the adsorption bed was studied to compare centripetal and centrifugal π-flows, and the former was shown to perform better on oxygen enrichment and adsorbent desorption. The steady state was achieved after eight cycles for the centripetal-π adsorber and each of the four steps of the PSA process was explored in detail to show the advantageous properties for oxygen generation in terms of adsorption and desorption. The relationships between the product flow rate and the oxygen purity and recovery were further investigated.

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“…It is very effective to study gas separation by numerical simulation [22][23][24][25][26]. However, most of the studies are based on the 1-D or 2-D RFA [27], and few studies have been reported in research of PSA oxygen production based on 3-D RFA.…”

Section: Introductionmentioning

confidence: 99%

3-D Modeling of Gas–Solid Two-Phase Flow in a π-Shaped Centripetal Radial Flow Adsorber

Wang

Yang

et al. 2020

Applied Sciences

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Radial flow adsorber (RFA) is widely used in large-scale pressure swing adsorption (PSA) oxygen production system because of high air separation. In this study, a 3-D modeling of gas–solid two-phase flow was established for the π-shaped centripetal RFA (CP-π RFA). The pressure difference, temperature changes, velocity profiles and oxygen distributions were comparatively studied using this model. Part of the results have been compared with the experiments results, which shows this model can give an accurately prediction. The results show that the pressure and velocity in the adsorber change greatly near the outer hole and central hole, but the overall pressure and velocity changes in the bed are stable. The oxygen product purity in the adsorbent filling area performed better on oxygen enrichment after eight cycles. The oxygen product flow rate will affect the oxygen production performance. The laws of the pressure, velocity, temperature and oxygen distributions can provide an important technical reference for CP-π RFA in the PSA for oxygen production.

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Study of a novel rapid vacuum pressure swing adsorption process with intermediate gas pressurization for producing oxygen

Cited by 29 publications

References 26 publications

Flexible oxygen concentrators for medical applications

Flexible oxygen concentrators for medical applications

Two-Dimensional Modeling of Pressure Swing Adsorption (PSA) Oxygen Generation with Radial-Flow Adsorber

3-D Modeling of Gas–Solid Two-Phase Flow in a π-Shaped Centripetal Radial Flow Adsorber

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