Experimental performance analysis of vacuum pressure swing adsorption air separation process under plateau special conditions

Zhu, Xianqiang; Sun, Yuan; Liu, Yingshu; Sun, Xianhang; Shi, Jujun

doi:10.1080/01496395.2022.2085115

Cited by 6 publications

(3 citation statements)

References 34 publications

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“…The effect of altitude on oxygen production can be slowed down by prolonging the adsorption time and pressure equalisation time. A research institute in Beijing [8][9][10][11][12][13] explored the effects of adsorption time, pressure equalisation time, cleaning time, and product gas flow rate on oxygen production at different altitudes. The discharge gas pressurisation process of rapid PSA oxygen production was studied.…”

Section: Introductionmentioning

confidence: 99%

Influence Factors of Pressure Swing Adsorption for Oxygen Production by the Orthogonal Method and the Response Surface Method

Jiang,

Huang

2024

Processes

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Adsorption pressure is one of the important factors affecting oxygen production in the process of pressure swing adsorption oxygen production. Three important factors, namely, the adsorption period, pressure equalisation time, and outlet flow rate, determine the variation in the adsorption pressure. In this study, the effects of the adsorption period, pressure equalisation time, and outlet flow rate on oxygen concentration were investigated through orthogonal experiments and response surface analysis. The experiments verified that three factors including the adsorption period, pressure equalisation time, and outlet flow rate have optimal values in the oxygen production process. Response surface analysis showed that the adsorption period had the greatest effect on the oxygen concentration, followed by the equalisation time, and the outlet flow rate had the least effect. The optimum process conditions are an adsorption time of 7.88 s, a pressure equalisation time of 0.9 s, an outlet flow rate of 2.31 L/min, and an oxygen concentration of 96.7%.

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Section: Introductionmentioning

confidence: 99%

Influence Factors of Pressure Swing Adsorption for Oxygen Production by the Orthogonal Method and the Response Surface Method

Jiang,

Huang

2024

Processes

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“…One common application of pressure swing adsorption (PSA) air separation technology is as a oxygen concentrator, which directly produces ~93% O 2 from compressed air [1,2]. The oxygen concentrator plays a significant role in medical treatments and oxygen conditioning of indoor environments, due to its advantages of high purity, cost-effective investment and high operational flexibility [3][4][5]. The development of miniature oxygen concentrators for use in individual patient oxygen therapy soon followed the introduction of industrial PSA oxygen production from air [2].…”

Section: Introductionmentioning

confidence: 99%

“…However, most of the above studies use the simple assumption of mass transfer rate solely controlled with macropore diffusion for small LiLSX particles, which induces significant inaccuracies when numerically predicting the separation performance [7]. The assumption of macropore diffusion is recognized as the dominant mass transfer resistance and traditionally provides a reasonable performance estimation for adsorption involving large zeolite particles [13,16,[18][19][20][21][22]. Rumbo Morales et al [19,20] conducted a parametric study of PSA using a lumped mass transfer model (comprising film resistance, macropore diffusion and micro-pore diffusion) for small particles and the simulation result provided a reasonable prediction of performance.…”

Section: Introductionmentioning

confidence: 99%

Mass and Heat Transfer of Pressure Swing Adsorption Oxygen Production Process with Small Adsorbent Particles

Sun,

Zhang,

Zhu

et al. 2023

Processes

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Rapid-cycle pressure swing adsorption (PSA) with small adsorbents particles is intended to improve mass transfer rate and productivity. However, the mass transfer mechanisms are changed with reduction of particle size during rapid-cycle adsorption process. A heat and mass transfer model of rapid-cycle PSA air separation process employing small LiLSX zeolite particles is developed and experimentally validated to numerically analyze the effects of mass transfer resistances on the characteristics of cyclic adsorption process. Multicomponent Langmuir model and linear driving force model are employed for characterizing the adsorption equilibrium and kinetic. The results of numerical analysis demonstrate that the dominant mass transfer resistance of small adsorbents particles is a combination of film resistance, axial dispersion effect and macropore diffusion resistance. The oxygen purity, recovery and productivity of the product are overestimated by ~2–4% when the effect of axial dispersion on mass transfer is ignored. As particle size decreases, the front of nitrogen-adsorbed concentration and gas temperature become sharp, which effectively improves the performance. However, the adverse effect of axial dispersion on the mass transfer becomes significant at very small particles conditions. It is nearly identical shapes of nitrogen concentration and gas temperature profiles after adsorption and desorption steps. The profiles are pushed forward near the production end with an increase in bed porosities. The optimal oxygen recovery and productivity are achieved with a particle diameter of 0.45 mm and bed porosity of 0.39 during the PSA process.

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Enhanced Direct Air Carbon Capture on NaX Zeolite by Electric‐Field Enhanced Physical Adsorption and In Situ CO₂ Synergistic Effects of Cold Plasma

Shen,

Kong,

Guo

et al. 2024

Adv Funct Materials

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Direct air carbon capture (DAC) is vital to achieving negative CO2 emissions, with physical adsorption offering a cost‐effective and energy‐efficient solution. an advanced zeolite modification technique is presented using cold plasma, which enhances the CO2 adsorption efficiency of NaX zeolite by 11.5% after just 60 min. This method utilizes the electric field to reorganize cation distribution and pore structure and significantly improve the adsorption capacity, efficiency, and selectivity. Compared to traditional methods, this technique is simpler and more effective, as demonstrated through first‐principles calculations, thermodynamics, kinetics, and adsorption equilibrium studies.

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Experimental performance analysis of vacuum pressure swing adsorption air separation process under plateau special conditions

Cited by 6 publications

References 34 publications

Influence Factors of Pressure Swing Adsorption for Oxygen Production by the Orthogonal Method and the Response Surface Method

Influence Factors of Pressure Swing Adsorption for Oxygen Production by the Orthogonal Method and the Response Surface Method

Mass and Heat Transfer of Pressure Swing Adsorption Oxygen Production Process with Small Adsorbent Particles

Enhanced Direct Air Carbon Capture on NaX Zeolite by Electric‐Field Enhanced Physical Adsorption and In Situ CO₂ Synergistic Effects of Cold Plasma

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Experimental performance analysis of vacuum pressure swing adsorption air separation process under plateau special conditions

Cited by 6 publications

References 34 publications

Influence Factors of Pressure Swing Adsorption for Oxygen Production by the Orthogonal Method and the Response Surface Method

Influence Factors of Pressure Swing Adsorption for Oxygen Production by the Orthogonal Method and the Response Surface Method

Mass and Heat Transfer of Pressure Swing Adsorption Oxygen Production Process with Small Adsorbent Particles

Enhanced Direct Air Carbon Capture on NaX Zeolite by Electric‐Field Enhanced Physical Adsorption and In Situ CO2 Synergistic Effects of Cold Plasma

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Enhanced Direct Air Carbon Capture on NaX Zeolite by Electric‐Field Enhanced Physical Adsorption and In Situ CO₂ Synergistic Effects of Cold Plasma