Experimental study of a rotary valve multi-bed rapid cycle pressure swing adsorption process based medical oxygen concen
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Experimental study of a rotary valve multi‑bed rapid cycle pressure swing adsorption process based medical oxygen concentrator Xianqiang Zhu1,2 · Xiaowei Wang3 Received: 17 January 2020 / Revised: 16 April 2020 / Accepted: 13 May 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Rapid cycle pressure swing adsorption (RCPSA) characterized by short cycle time permits adsorbents to be used more frequently and increases process productivity. A rotary valve multi-bed RCPSA process is proposed to improve the performance of miniature oxygen concentrator. The RCPSA air separation system is highly integrated by four adsorbent beds and a rotary valve. The effects of process parameters on the performance of the RCPSA system were conducted by experiments. Results showed that the system could produce 1 L min−1 of ~ 92% O2 with ~ 30% of oxygen recovery and ~ 78 kg·TPD−1 of bed size factor (BSF) from compressed air at low adsorption and desorption pressure ratio (~ 250:101 kPa). The minimum BSF with ~ 5 s optimal cycle time is a sharp decline with increasing of pressure ratio. However, a reversed trend between BSF and unit power at different pressure ratios is prominently emerged. Keywords Oxygen concentrator · Pressure swing adsorption · Rapid cycle · Rotary valve · Multi-bed · Process performance
1 Introduction Rapid cycle pressure swing adsorption (RCPSA) is characterized by short cycle time and high productivity (Rama Rao et al. 2010, 2014a, b, 2015a, b, c; Chai et al. 2011; Rama Rao and Farooq 2014; Zhu et al. 2017; Moran and Talu 2018; Ackley 2019). The total cycle time of RCPSA is usually about 10 s, preferably less than 5 s (Chai et al. 2011; Rama Rao et al. 2014a; Moran and Talu 2018). Rapid cycles permit adsorbents to be used more frequently, therefore increase the productivity provided that the performance is not affected by fast cycling of the process. And this process is particularly suitable for miniaturization and modular Electronic supplementary material The online version of this article (https://doi.org/10.1007/s10450-020-00240-5) contains supplementary material, which is available to authorized users. * Xianqiang Zhu [email protected]; [email protected] 1
Present Address: School of Mechanical & Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Republic of Singapore
2
Jiangsu Oxtek Air Equipment & Technology Co., Ltd., Danyang 212300, China
3
IP Tech Pte Ltd., 2 Venture Drive, Singapore 608526, Republic of Singapore
separator, such as miniature medical oxygen concentrators (Chai et al. 2011; Rama Rao et al. 2014a; Zhu et al. 2017). Although the RCPSA often labeled rapid pressure swing adsorption (RPSA) (Rama Rao et al. 2014a, 2015a; Zheng et al. 2017), Moran and Talu (2018) pointed out that the RCPSA process is clearly different from the original RPSA concept (Turnock and Kadlec 1971) which involved single column with simple cycle and high pressure drop. The RCPSA air separation system is much closer to a c
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