Zhi Qi, Bo Ren, Yalou Guo, Chuhan Fu, Jinbiao Luo, Sibin Li, Jianbin Qin, Gang Wang, Tao Qi, Paul Webley, Guoping Hu
{"title":"快速真空摇摆吸附制氧空气分离过程模拟与分析","authors":"Zhi Qi, Bo Ren, Yalou Guo, Chuhan Fu, Jinbiao Luo, Sibin Li, Jianbin Qin, Gang Wang, Tao Qi, Paul Webley, Guoping Hu","doi":"10.1007/s10450-025-00646-z","DOIUrl":null,"url":null,"abstract":"<div><p>Fast pressure swing adsorption (FPSA) is an adsorption-based separation process with cycle durations ranging from a few to tens of seconds. While widely used in small-scale oxygen generators, FPSA still holds significant potential for improvement. In this study, we propose and demonstrate a novel rapid vacuum swing adsorption (FVSA) cycle, where adsorption occurs at atmospheric pressure and desorption under vacuum, to enhance small-scale oxygen production from air. A simulated air mixture, containing 78% nitrogen (N<sub>2</sub>), 21% oxygen (O<sub>2</sub>) and 1% argon (Ar), was processed through a dual-column FVSA system using LiLSX zeolite as the adsorbent. A numerical model was developed on Aspen Adsorption and validated against previously reported results. A parametric study was conducted to assess the effects of various operating conditions on separation performance. The results indicate that a low feed flow rate, low desorption pressure, and an optimal length-to-diameter (<i>L/D</i>) ratio improve the separation efficiency. Under operating conditions of 101.1 kPa adsorption pressure, 40.3 kPa desorption pressure, and a feed rate of 47 L/min, the system achieved a 91% O<sub>2</sub> product stream with a 5 L/min flowrate and 44% O<sub>2</sub> recovery. Compared to traditional FPSA, FVSA reduced energy consumption by 13% (39.24 vs. 33.99 kJ·mol<sup>−1</sup>O<sub>2</sub>) and lowered the air-to-oxygen ratio by 25% (14.4 vs. 10.8) while maintaining comparable O<sub>2</sub> purity, demonstrating its potential for more efficient oxygen production.</p></div>","PeriodicalId":458,"journal":{"name":"Adsorption","volume":"31 6","pages":""},"PeriodicalIF":3.1000,"publicationDate":"2025-08-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s10450-025-00646-z.pdf","citationCount":"0","resultStr":"{\"title\":\"Process simulation and analysis of air separation for oxygen production via fast vacuum swing adsorption\",\"authors\":\"Zhi Qi, Bo Ren, Yalou Guo, Chuhan Fu, Jinbiao Luo, Sibin Li, Jianbin Qin, Gang Wang, Tao Qi, Paul Webley, Guoping Hu\",\"doi\":\"10.1007/s10450-025-00646-z\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Fast pressure swing adsorption (FPSA) is an adsorption-based separation process with cycle durations ranging from a few to tens of seconds. While widely used in small-scale oxygen generators, FPSA still holds significant potential for improvement. In this study, we propose and demonstrate a novel rapid vacuum swing adsorption (FVSA) cycle, where adsorption occurs at atmospheric pressure and desorption under vacuum, to enhance small-scale oxygen production from air. A simulated air mixture, containing 78% nitrogen (N<sub>2</sub>), 21% oxygen (O<sub>2</sub>) and 1% argon (Ar), was processed through a dual-column FVSA system using LiLSX zeolite as the adsorbent. A numerical model was developed on Aspen Adsorption and validated against previously reported results. A parametric study was conducted to assess the effects of various operating conditions on separation performance. The results indicate that a low feed flow rate, low desorption pressure, and an optimal length-to-diameter (<i>L/D</i>) ratio improve the separation efficiency. Under operating conditions of 101.1 kPa adsorption pressure, 40.3 kPa desorption pressure, and a feed rate of 47 L/min, the system achieved a 91% O<sub>2</sub> product stream with a 5 L/min flowrate and 44% O<sub>2</sub> recovery. 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Process simulation and analysis of air separation for oxygen production via fast vacuum swing adsorption
Fast pressure swing adsorption (FPSA) is an adsorption-based separation process with cycle durations ranging from a few to tens of seconds. While widely used in small-scale oxygen generators, FPSA still holds significant potential for improvement. In this study, we propose and demonstrate a novel rapid vacuum swing adsorption (FVSA) cycle, where adsorption occurs at atmospheric pressure and desorption under vacuum, to enhance small-scale oxygen production from air. A simulated air mixture, containing 78% nitrogen (N2), 21% oxygen (O2) and 1% argon (Ar), was processed through a dual-column FVSA system using LiLSX zeolite as the adsorbent. A numerical model was developed on Aspen Adsorption and validated against previously reported results. A parametric study was conducted to assess the effects of various operating conditions on separation performance. The results indicate that a low feed flow rate, low desorption pressure, and an optimal length-to-diameter (L/D) ratio improve the separation efficiency. Under operating conditions of 101.1 kPa adsorption pressure, 40.3 kPa desorption pressure, and a feed rate of 47 L/min, the system achieved a 91% O2 product stream with a 5 L/min flowrate and 44% O2 recovery. Compared to traditional FPSA, FVSA reduced energy consumption by 13% (39.24 vs. 33.99 kJ·mol−1O2) and lowered the air-to-oxygen ratio by 25% (14.4 vs. 10.8) while maintaining comparable O2 purity, demonstrating its potential for more efficient oxygen production.
期刊介绍：
The journal Adsorption provides authoritative information on adsorption and allied fields to scientists, engineers, and technologists throughout the world. The information takes the form of peer-reviewed articles, R&D notes, topical review papers, tutorial papers, book reviews, meeting announcements, and news.
Coverage includes fundamental and practical aspects of adsorption: mathematics, thermodynamics, chemistry, and physics, as well as processes, applications, models engineering, and equipment design.
Among the topics are Adsorbents: new materials, new synthesis techniques, characterization of structure and properties, and applications; Equilibria: novel theories or semi-empirical models, experimental data, and new measurement methods; Kinetics: new models, experimental data, and measurement methods. Processes: chemical, biochemical, environmental, and other applications, purification or bulk separation, fixed bed or moving bed systems, simulations, experiments, and design procedures.
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