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Paul A Webley - One of the best experts on this subject based on the ideXlab platform.
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experimental study on Oxygen Concentrator with wide product flow rate range individual parametric effect and process improvement strategy
Separation and Purification Technology, 2021Co-Authors: Quanli Zhang, Yingshu Liu, Penny Xiao, Wenhai Liu, Xiong Yang, Chunyu Zhao, Ralph T Yang, Paul A WebleyAbstract:Abstract Improvement on Oxygen (O2) Concentrator using pressure swing adsorption (PSA) technology according to variable product demands is of great significance, which, for instance, provides the key step for success in practical O2 therapy for COVID-19 patients who need to be delivered with a wide product flow rate range (1–15 standard liter per minute (SLPM)) of medical O2 (purity > 82%). This work studied the individual effects of major PSA process parameters on O2 production performance at the product flow rate of 3.46–19.88 SLPM (0.64–3.68 SLPM per kilogram of adsorbent (SLPM/kg)), based on a self-designed two-bed PSA unit with a modified Skarstom cycle using Li-LSX zeolite adsorbents. The improvement strategies were accordingly proposed based upon influential mechanisms of each parameter: 1) at lower product flow rates (≤2.00 SLPM/kg), increasing the purge flow rate and decreasing the adsorption pressure to suppress excess O2 adsorption, and decreasing the feed flow rate to ensure low energy consumption; 2) at higher product flow rates (≥2.00 SLPM/kg), decreasing the purge flow rate and increasing the adsorption pressure to eliminate N2 breakthrough and O2-rich product waste, and appropriately increasing the feed flow rate to enhance cost-effectiveness. An improved set of parameters rendered O2 purity (95.67–74.86%), recovery (11.28–49.05%), productivity (0.47–2.04 mmol/kg/s) increased by up to 3.52–20.08%, 0.36–20.47%, 6.82–19.61%, and energy consumption (4.07–0.95 kWh/kgO2) decreased by up to 10.56–18.10%, in comparison to two conventional sets, respectively. The results are beneficial for developing intellectualized and flexibly-controlled O2 Concentrators for practical applications.
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experimental study on Oxygen Concentrator with wide product flow rate range individual parametric effect and process improvement strategy
Separation and Purification Technology, 2021Co-Authors: Quanli Zhang, Yingshu Liu, Penny Xiao, Wenhai Liu, Xiong Yang, Chunyu Zhao, Ralph T Yang, Paul A WebleyAbstract:Abstract Improvement on Oxygen (O2) Concentrator using pressure swing adsorption (PSA) technology according to variable product demands is of great significance, which, for instance, provides the key step for success in practical O2 therapy for COVID-19 patients who need to be delivered with a wide flow range (1 – 15 standard liter per minute (SLPM)) of medical O2 (purity >82%). This work studied the individual effects of major PSA process parameters on O2 production performance at the product flow rate of 3.46 – 19.88 SLPM (0.64 – 3.68 SLPM per kilogram of adsorbent (SLPM/kg)), based on a self-designed two-bed PSA unit with a modified Skarstom cycle using Li-LSX zeolite adsorbents. The improvement strategies were accordingly proposed based upon influential mechanisms of each parameter: 1) at lower product flow rates (≤2.00 SLPM/kg), increasing the purge flow rate and decreasing the adsorption pressure to suppress excess O2 adsorption, and decreasing the feed flow rate to ensure low energy consumption; 2) at higher product flow rates (≥2.00 SLPM/kg), decreasing the purge flow rate and increasing the adsorption pressure to eliminate N2 breakthrough and O2-rich product waste, and appropriately increasing the feed flow rate to enhance cost-effectiveness. An improved set of parameters (at 3.46 – 19.88 SLPM) rendered O2 purity (95.67 – 74.86%), recovery (11.28 – 49.05%), productivity (0.47 – 2.04 mmol/kg/s) increased by up to 3.52 – 20.08%, 0.36 – 20.47%, 6.82 – 19.61%, and energy consumption (4.07 – 0.95 kWh/kgO2) decreased by up to 10.56 – 18.10%, respectively, in comparison to two conventional sets. The results are beneficial for realizing intellectualized and flexibly-controlled O2 Concentrators for practical applications.
Shivaji Sircar - One of the best experts on this subject based on the ideXlab platform.
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experimental study of a novel rapid pressure swing adsorption based medical Oxygen Concentrator effect of the adsorbent selectivity of n2 over o2
Industrial & Engineering Chemistry Research, 2016Co-Authors: Rama Rao Vemula, Mayuresh V. Kothare, Shivaji SircarAbstract:It was experimentally demonstrated that the performance of a medical Oxygen Concentrator based on rapid pressure swing adsorption (RPSA) process using a LiLSX zeolite was improved [lower bed size factor (BSF) and higher Oxygen recovery (RO)] when the adsorbent exhibited higher selectivity of adsorption of N2 over O2. The effects of N2 selectivity on BSF and RO as functions of the RPSA process cycle times were found to be complex and nonintuitive. The key properties of a LiLSX zeolite sample for adsorption of N2 and O2 (pure and binary gas isotherms, binary selectivity, pure gas isosteric heats, pure gas mass-transfer characteristics, and degrees of adsorbent heterogeneity), which exhibited a relatively higher selectivity of adsorption for N2 over O2 compared to a previously reported sample, were measured and used in this study.
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novel design and performance of a medical Oxygen Concentrator using a rapid pressure swing adsorption concept
Aiche Journal, 2014Co-Authors: Vemula Rama Rao, Mayuresh V. Kothare, Shivaji SircarAbstract:A novel design of a compact rapid pressure swing adsorption system consisting of a single adsorber enclosed inside a product storage tank is proposed for application as a medical Oxygen Concentrator (MOC). A self-contained test unit for the process is constructed which is capable of directly and continuously producing 1–3 sl/m of 90% O2 from compressed air. Pelletized LiLSX zeolite is used as the air separation adsorbent. Steady state process performance data [bed size factor (BSF) and O2 recovery (R) as functions of total cycle time (tc)], as well as transient, cyclic, adsorber pressure, and temperature profiles are presented. A four-step Skarstrom-like pressure swing adsorption cycle was used. Two options for column pressurization, (a) using compressed feed air cocurrently or (b) using a part of the Oxygen-enriched product gas counter-currently were evaluated. Option (b) exhibited superior performance. The optimum total cycle time for option (b) was 5–6 s where the BSF was lowest (∼45 kgs/TPD O2) and the corresponding R was ∼29.3%. These numbers indicate that the adsorbent inventory of a MOC can be potentially reduced by a factor of three while offering a ∼10–20% higher O2 recovery compared to a typical commercial unit. © 2014 American Institute of Chemical Engineers AIChE J, 60: 3330–3335, 2014
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highlights of non equilibrium non isobaric non isothermal desorption of nitrogen from a lix zeolite column by rapid pressure reduction and rapid purge by Oxygen
Adsorption-journal of The International Adsorption Society, 2014Co-Authors: Siew Wah Chai, Mayuresh V. Kothare, Shivaji SircarAbstract:The effects of adsorption kinetics, column pressure drop, gas phase mass and heat dispersions, gas–solid heat transfer resistance, and adsorber adiabaticity on desorption of N2 from a LiX zeolite column by O2 purge as well as pressurization–depressurization of the column using pure N2 were recently studied using a numerical model of these processes [Chai et al. in Ind Eng Chem Res 50:8703, 2011, Chai et al. in Adsorption 18:87, 2012, Chai et al. in AIChE J 59:365 2013; Rama Rao et al. in Adsorption 2013]. The role of adsorbent particle size and column length to diameter ratio in determining the durations and efficiency of these processes were also investigated. These studies revealed several important limiting and optimum conditions for optimum operation of these processes which can be useful in design of a practical rapid pressure swing adsorption (RPSA) process for medical Oxygen Concentrator (MOC) application. The purpose of this short review article is to consolidate and re-emphasize these important results in a single article to be used as a guideline for design of a RPSA-MOC unit.
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Highlights of non-equilibrium, non-isobaric, non-isothermal desorption of nitrogen from a LiX zeolite column by rapid pressure reduction and rapid purge by Oxygen
Adsorption, 2014Co-Authors: V. Rama Rao, Siew Wah Chai, Mayuresh V. Kothare, Shivaji SircarAbstract:The effects of adsorption kinetics, column pressure drop, gas phase mass and heat dispersions, gas–solid heat transfer resistance, and adsorber adiabaticity on desorption of N_2 from a LiX zeolite column by O_2 purge as well as pressurization–depressurization of the column using pure N_2 were recently studied using a numerical model of these processes [Chai et al. in Ind Eng Chem Res 50:8703, 2011 , Chai et al. in Adsorption 18:87, 2012 , Chai et al. in AIChE J 59:365 2013 ; Rama Rao et al. in Adsorption 2013 ]. The role of adsorbent particle size and column length to diameter ratio in determining the durations and efficiency of these processes were also investigated. These studies revealed several important limiting and optimum conditions for optimum operation of these processes which can be useful in design of a practical rapid pressure swing adsorption (RPSA) process for medical Oxygen Concentrator (MOC) application. The purpose of this short review article is to consolidate and re-emphasize these important results in a single article to be used as a guideline for design of a RPSA-MOC unit.
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numerical study of nitrogen desorption by rapid Oxygen purge for a medical Oxygen Concentrator
Adsorption-journal of The International Adsorption Society, 2012Co-Authors: Siew Wah Chai, Mayuresh V. Kothare, Shivaji SircarAbstract:Efficient desorption of selectively adsorbed N2 from air in a packed column of LiX zeolite by rapidly purging the adsorbent with an O2 enriched gas is an important element of a rapid cyclic pressure swing adsorption (RPSA) process used in the design of many medical Oxygen Concentrators (MOC). The amount of O2 purge gas used in the desorption process is a sensitive variable in determining the overall separation performance of a MOC unit. Various resistances like (a) adsorption kinetics, (b) column pressure drop, (c) non-isothermal column operation, (d) gas phase mass and thermal axial dispersions, and (e) gas-solid heat transfer kinetics determine the amount of purge gas required for efficient desorption of N2. The impacts of these variables on the purge efficiency were numerically simulated using a detailed mathematical model of non-isothermal, non-isobaric, and non-equilibrium desorption process in an adiabatic column.
Quanli Zhang - One of the best experts on this subject based on the ideXlab platform.
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experimental study on Oxygen Concentrator with wide product flow rate range individual parametric effect and process improvement strategy
Separation and Purification Technology, 2021Co-Authors: Quanli Zhang, Yingshu Liu, Penny Xiao, Wenhai Liu, Xiong Yang, Chunyu Zhao, Ralph T Yang, Paul A WebleyAbstract:Abstract Improvement on Oxygen (O2) Concentrator using pressure swing adsorption (PSA) technology according to variable product demands is of great significance, which, for instance, provides the key step for success in practical O2 therapy for COVID-19 patients who need to be delivered with a wide product flow rate range (1–15 standard liter per minute (SLPM)) of medical O2 (purity > 82%). This work studied the individual effects of major PSA process parameters on O2 production performance at the product flow rate of 3.46–19.88 SLPM (0.64–3.68 SLPM per kilogram of adsorbent (SLPM/kg)), based on a self-designed two-bed PSA unit with a modified Skarstom cycle using Li-LSX zeolite adsorbents. The improvement strategies were accordingly proposed based upon influential mechanisms of each parameter: 1) at lower product flow rates (≤2.00 SLPM/kg), increasing the purge flow rate and decreasing the adsorption pressure to suppress excess O2 adsorption, and decreasing the feed flow rate to ensure low energy consumption; 2) at higher product flow rates (≥2.00 SLPM/kg), decreasing the purge flow rate and increasing the adsorption pressure to eliminate N2 breakthrough and O2-rich product waste, and appropriately increasing the feed flow rate to enhance cost-effectiveness. An improved set of parameters rendered O2 purity (95.67–74.86%), recovery (11.28–49.05%), productivity (0.47–2.04 mmol/kg/s) increased by up to 3.52–20.08%, 0.36–20.47%, 6.82–19.61%, and energy consumption (4.07–0.95 kWh/kgO2) decreased by up to 10.56–18.10%, in comparison to two conventional sets, respectively. The results are beneficial for developing intellectualized and flexibly-controlled O2 Concentrators for practical applications.
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experimental study on Oxygen Concentrator with wide product flow rate range individual parametric effect and process improvement strategy
Separation and Purification Technology, 2021Co-Authors: Quanli Zhang, Yingshu Liu, Penny Xiao, Wenhai Liu, Xiong Yang, Chunyu Zhao, Ralph T Yang, Paul A WebleyAbstract:Abstract Improvement on Oxygen (O2) Concentrator using pressure swing adsorption (PSA) technology according to variable product demands is of great significance, which, for instance, provides the key step for success in practical O2 therapy for COVID-19 patients who need to be delivered with a wide flow range (1 – 15 standard liter per minute (SLPM)) of medical O2 (purity >82%). This work studied the individual effects of major PSA process parameters on O2 production performance at the product flow rate of 3.46 – 19.88 SLPM (0.64 – 3.68 SLPM per kilogram of adsorbent (SLPM/kg)), based on a self-designed two-bed PSA unit with a modified Skarstom cycle using Li-LSX zeolite adsorbents. The improvement strategies were accordingly proposed based upon influential mechanisms of each parameter: 1) at lower product flow rates (≤2.00 SLPM/kg), increasing the purge flow rate and decreasing the adsorption pressure to suppress excess O2 adsorption, and decreasing the feed flow rate to ensure low energy consumption; 2) at higher product flow rates (≥2.00 SLPM/kg), decreasing the purge flow rate and increasing the adsorption pressure to eliminate N2 breakthrough and O2-rich product waste, and appropriately increasing the feed flow rate to enhance cost-effectiveness. An improved set of parameters (at 3.46 – 19.88 SLPM) rendered O2 purity (95.67 – 74.86%), recovery (11.28 – 49.05%), productivity (0.47 – 2.04 mmol/kg/s) increased by up to 3.52 – 20.08%, 0.36 – 20.47%, 6.82 – 19.61%, and energy consumption (4.07 – 0.95 kWh/kgO2) decreased by up to 10.56 – 18.10%, respectively, in comparison to two conventional sets. The results are beneficial for realizing intellectualized and flexibly-controlled O2 Concentrators for practical applications.
Yingshu Liu - One of the best experts on this subject based on the ideXlab platform.
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experimental study on Oxygen Concentrator with wide product flow rate range individual parametric effect and process improvement strategy
Separation and Purification Technology, 2021Co-Authors: Quanli Zhang, Yingshu Liu, Penny Xiao, Wenhai Liu, Xiong Yang, Chunyu Zhao, Ralph T Yang, Paul A WebleyAbstract:Abstract Improvement on Oxygen (O2) Concentrator using pressure swing adsorption (PSA) technology according to variable product demands is of great significance, which, for instance, provides the key step for success in practical O2 therapy for COVID-19 patients who need to be delivered with a wide product flow rate range (1–15 standard liter per minute (SLPM)) of medical O2 (purity > 82%). This work studied the individual effects of major PSA process parameters on O2 production performance at the product flow rate of 3.46–19.88 SLPM (0.64–3.68 SLPM per kilogram of adsorbent (SLPM/kg)), based on a self-designed two-bed PSA unit with a modified Skarstom cycle using Li-LSX zeolite adsorbents. The improvement strategies were accordingly proposed based upon influential mechanisms of each parameter: 1) at lower product flow rates (≤2.00 SLPM/kg), increasing the purge flow rate and decreasing the adsorption pressure to suppress excess O2 adsorption, and decreasing the feed flow rate to ensure low energy consumption; 2) at higher product flow rates (≥2.00 SLPM/kg), decreasing the purge flow rate and increasing the adsorption pressure to eliminate N2 breakthrough and O2-rich product waste, and appropriately increasing the feed flow rate to enhance cost-effectiveness. An improved set of parameters rendered O2 purity (95.67–74.86%), recovery (11.28–49.05%), productivity (0.47–2.04 mmol/kg/s) increased by up to 3.52–20.08%, 0.36–20.47%, 6.82–19.61%, and energy consumption (4.07–0.95 kWh/kgO2) decreased by up to 10.56–18.10%, in comparison to two conventional sets, respectively. The results are beneficial for developing intellectualized and flexibly-controlled O2 Concentrators for practical applications.
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experimental study on Oxygen Concentrator with wide product flow rate range individual parametric effect and process improvement strategy
Separation and Purification Technology, 2021Co-Authors: Quanli Zhang, Yingshu Liu, Penny Xiao, Wenhai Liu, Xiong Yang, Chunyu Zhao, Ralph T Yang, Paul A WebleyAbstract:Abstract Improvement on Oxygen (O2) Concentrator using pressure swing adsorption (PSA) technology according to variable product demands is of great significance, which, for instance, provides the key step for success in practical O2 therapy for COVID-19 patients who need to be delivered with a wide flow range (1 – 15 standard liter per minute (SLPM)) of medical O2 (purity >82%). This work studied the individual effects of major PSA process parameters on O2 production performance at the product flow rate of 3.46 – 19.88 SLPM (0.64 – 3.68 SLPM per kilogram of adsorbent (SLPM/kg)), based on a self-designed two-bed PSA unit with a modified Skarstom cycle using Li-LSX zeolite adsorbents. The improvement strategies were accordingly proposed based upon influential mechanisms of each parameter: 1) at lower product flow rates (≤2.00 SLPM/kg), increasing the purge flow rate and decreasing the adsorption pressure to suppress excess O2 adsorption, and decreasing the feed flow rate to ensure low energy consumption; 2) at higher product flow rates (≥2.00 SLPM/kg), decreasing the purge flow rate and increasing the adsorption pressure to eliminate N2 breakthrough and O2-rich product waste, and appropriately increasing the feed flow rate to enhance cost-effectiveness. An improved set of parameters (at 3.46 – 19.88 SLPM) rendered O2 purity (95.67 – 74.86%), recovery (11.28 – 49.05%), productivity (0.47 – 2.04 mmol/kg/s) increased by up to 3.52 – 20.08%, 0.36 – 20.47%, 6.82 – 19.61%, and energy consumption (4.07 – 0.95 kWh/kgO2) decreased by up to 10.56 – 18.10%, respectively, in comparison to two conventional sets. The results are beneficial for realizing intellectualized and flexibly-controlled O2 Concentrators for practical applications.
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effects of operating temperature on the performance of small scale rapid cycle pressure swing adsorption air separation process
Adsorption-journal of The International Adsorption Society, 2021Co-Authors: Xianqiang Zhu, Yingshu Liu, Ralph T YangAbstract:The effects of operating temperature on the performance of small scale Oxygen Concentrator were experimentally investigated using a rotary valve multi-column rapid cycle pressure swing adsorption (PSA) unit which produced a continuous stream of ≥ 90% O2 from compressed air. Simple cooling fans and air cylinder were used for controlling the temperature of compressed air. The change of column midpoint gas temperature inside adsorption column was relatively small and approximately 3–5 K with a low pressure ratio of ~ 250:101 kPa during each cycle. The Oxygen recovery could be improved by increasing the operating temperature and the bed size factor (BSF) could be reduced by decreasing the operating temperature. However, the adverse thermal effects on Oxygen recovery and BSF became more dominant at very low and high operating temperatures. A similar trend between unit power and BSF at different operating temperature was emerged. There was an appropriate temperature range for achieving favorable performance.
Penny Xiao - One of the best experts on this subject based on the ideXlab platform.
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experimental study on Oxygen Concentrator with wide product flow rate range individual parametric effect and process improvement strategy
Separation and Purification Technology, 2021Co-Authors: Quanli Zhang, Yingshu Liu, Penny Xiao, Wenhai Liu, Xiong Yang, Chunyu Zhao, Ralph T Yang, Paul A WebleyAbstract:Abstract Improvement on Oxygen (O2) Concentrator using pressure swing adsorption (PSA) technology according to variable product demands is of great significance, which, for instance, provides the key step for success in practical O2 therapy for COVID-19 patients who need to be delivered with a wide product flow rate range (1–15 standard liter per minute (SLPM)) of medical O2 (purity > 82%). This work studied the individual effects of major PSA process parameters on O2 production performance at the product flow rate of 3.46–19.88 SLPM (0.64–3.68 SLPM per kilogram of adsorbent (SLPM/kg)), based on a self-designed two-bed PSA unit with a modified Skarstom cycle using Li-LSX zeolite adsorbents. The improvement strategies were accordingly proposed based upon influential mechanisms of each parameter: 1) at lower product flow rates (≤2.00 SLPM/kg), increasing the purge flow rate and decreasing the adsorption pressure to suppress excess O2 adsorption, and decreasing the feed flow rate to ensure low energy consumption; 2) at higher product flow rates (≥2.00 SLPM/kg), decreasing the purge flow rate and increasing the adsorption pressure to eliminate N2 breakthrough and O2-rich product waste, and appropriately increasing the feed flow rate to enhance cost-effectiveness. An improved set of parameters rendered O2 purity (95.67–74.86%), recovery (11.28–49.05%), productivity (0.47–2.04 mmol/kg/s) increased by up to 3.52–20.08%, 0.36–20.47%, 6.82–19.61%, and energy consumption (4.07–0.95 kWh/kgO2) decreased by up to 10.56–18.10%, in comparison to two conventional sets, respectively. The results are beneficial for developing intellectualized and flexibly-controlled O2 Concentrators for practical applications.
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experimental study on Oxygen Concentrator with wide product flow rate range individual parametric effect and process improvement strategy
Separation and Purification Technology, 2021Co-Authors: Quanli Zhang, Yingshu Liu, Penny Xiao, Wenhai Liu, Xiong Yang, Chunyu Zhao, Ralph T Yang, Paul A WebleyAbstract:Abstract Improvement on Oxygen (O2) Concentrator using pressure swing adsorption (PSA) technology according to variable product demands is of great significance, which, for instance, provides the key step for success in practical O2 therapy for COVID-19 patients who need to be delivered with a wide flow range (1 – 15 standard liter per minute (SLPM)) of medical O2 (purity >82%). This work studied the individual effects of major PSA process parameters on O2 production performance at the product flow rate of 3.46 – 19.88 SLPM (0.64 – 3.68 SLPM per kilogram of adsorbent (SLPM/kg)), based on a self-designed two-bed PSA unit with a modified Skarstom cycle using Li-LSX zeolite adsorbents. The improvement strategies were accordingly proposed based upon influential mechanisms of each parameter: 1) at lower product flow rates (≤2.00 SLPM/kg), increasing the purge flow rate and decreasing the adsorption pressure to suppress excess O2 adsorption, and decreasing the feed flow rate to ensure low energy consumption; 2) at higher product flow rates (≥2.00 SLPM/kg), decreasing the purge flow rate and increasing the adsorption pressure to eliminate N2 breakthrough and O2-rich product waste, and appropriately increasing the feed flow rate to enhance cost-effectiveness. An improved set of parameters (at 3.46 – 19.88 SLPM) rendered O2 purity (95.67 – 74.86%), recovery (11.28 – 49.05%), productivity (0.47 – 2.04 mmol/kg/s) increased by up to 3.52 – 20.08%, 0.36 – 20.47%, 6.82 – 19.61%, and energy consumption (4.07 – 0.95 kWh/kgO2) decreased by up to 10.56 – 18.10%, respectively, in comparison to two conventional sets. The results are beneficial for realizing intellectualized and flexibly-controlled O2 Concentrators for practical applications.
