Effect of intermittent purge on O 2 production with rapid pressure swing adsorption technology
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Effect of intermittent purge on O2 production with rapid pressure swing adsorption technology Yingshu Liu1,2 · Quanli Zhang1,2 · Yongzheng Cao3 · Xiong Yang1,2 · Ziyi Li1,2 · Wenhai Liu1,2 · Jean Baptiste Habyarimana1,2 · Yongkang Cui1,2 · Haoyu Wang2,4 · Ralph T. Yang5 Received: 13 August 2020 / Revised: 22 October 2020 / Accepted: 16 November 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract The rapid pressure swing adsorption (RPSA) technology has been widely used for applications including portable oxygen generators due to high O 2 productivities and low bed size factors (BSF, total amount of adsorbent per ton of O2 produced per 2 production in terms of its generally day, kg/TPDO2). The improvement of RPSA process has been a key issue for efficient O lower O2 recovery as compared to other processes. In this work, a dual-column RPSA oxygen production system with an intermittent purge step (intermittently switching between purge and interruption) was designed to investigate the effects of interruption frequency (the number of interruptions during a purge step) and times on the O 2 recovery, purity, productivity and BSF. Experimental results show the improvement on O2 production performance using the intermittent purge step in comparison to conventional continuous purge step. Under the optimized interruption frequency of 2 and time of 0.3 s, the O2 recovery, purity and productivity were increased from 36 to 39.2%, 89.5 to 93%, and 6.24 to 6.49 mmol/kg/s, respectively, while the BSF was decreased from 57.94 to 55.75 kg/TPDO2. Keywords Rapid pressure swing adsorption (RPSA) · Oxygen production · Intermittent purge · O2 recovery · Bed size factor (BSF)
1 Introduction In past few decades, the portable oxygen generator has been widely used in many oxygen supply applications for anoxic environments, due to its cost-effectiveness, operation flexibility, and adequate O2 purity [5, 18, 22]. The rapid pressure swing adsorption (RPSA) oxygen production process has * Ziyi Li [email protected] 1
School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
2
Beijing Higher Institution Engineering Research Center of Energy Conservation and Environmental Protection, Beijing 100083, China
3
Changsha Qicen Medical Technology Co., Ltd, Changsha 410000, Hunan, China
4
College of Biochemical Engineering, Beijing Union University, Beijing 100023, China
5
Department of Chemical Engineering, University of Michigan, Ann Arbor, MI 48109‑2136, USA
the advantages of shorter total process cycle time, higher 2 productivity (O2 production per second per kilogram O adsorbent, mmol/kg/s), and lower bed size factor (BSF, total amount of adsorbent per ton of O 2 produced per day, kg/ TPDO2) contributing to a more compact and lightweight unit [19, 21]. Therefore, portable oxygen generators mostly adopt RPSA process for their operation. However, the O 2 recovery is generally lower for RPSA as compare to other oxygen prod
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