The downsizing of a TSA system for an air purification unit using a high flow rate method

Hidano, Tatsuya; Nakamura, Mihoko; Nakamura, Akihiro; Kawai, Masato

doi:10.1007/s10450-010-9291-5

Cited by 8 publications

(6 citation statements)

References 4 publications

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“…Figure 1 shows the basic scheme of the TSA method of air separation using the adsorption-desorption cycle. In a standard TSA approach, the whole process occurs at atmospheric pressure, the adsorption stage takes place at ambient temperature, and the regeneration at increased temperature-usually at a temperature between 370-450 K [17]. Thus the temperature difference between the desorption and the adsorption stage usually varies between 70 and 150 K. This requires a supply of a significant amount of heat at this temperature level.…”

Section: Tsa Methods Of Air Separationmentioning

confidence: 99%

The Possible Coupling of LNG Regasification Process with the TSA Method of Oxygen Separation from Atmospheric Air

Banaszkiewicz

2021

Entropy

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Liquefied Natural Gas (LNG) must be vaporized before it is used in the combustion process. In most regasification terminals, energy that was previously expended to liquefy natural gas is dissipated in the environment. The paper proposes the use of the thermal effect of LNG regasification for the atmospheric air separation as a possible solution to the LNG exergy recovery problem. The presented idea is based on the coupling of the LNG regasification unit with an oxygen generator based on the Temperature Swing Adsorption (TSA) process. Theoretical analysis has revealed that it is thermodynamically justified to use the LNG enthalpy of vaporization for cooling of the TSA adsorption bed for increasing its adsorptive capacity. It has been shown that 1 kg of LNG carries enough exergy for separating up to approximately 100 g of oxygen using the TSA method. Although the paper suggests using the enthalpy of LNG vaporization for atmospheric air separation, similar processes for other gas mixture separations using the TSA method can be applied.

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Section: Tsa Methods Of Air Separationmentioning

confidence: 99%

The Possible Coupling of LNG Regasification Process with the TSA Method of Oxygen Separation from Atmospheric Air

Banaszkiewicz

2021

Entropy

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“…Schmidt et al (2008) proposed a hybrid PSA/TSA system that can adjust the quantity of heat to be provided by the regeneration gas as a function of temperature data, which were taken within a strategic portion of the water selective adsorbent zone. Hidano et al (2011) reduced the cost of adsorption vessel by 30% by using a high flow-rate method in a TSA air purification system. Zhang and Wang (2013) proposed a three-bed TSA system, which can achieve energy savings of 29.5% by recovering and reusing the effluent purge gas.…”

Section: Introductionmentioning

confidence: 99%

Desorption characteristics of H2O and CO2 from alumina F200 under different feed/purge pressure ratios and regeneration temperatures

et al. 2017

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Air pre-purification is an important process for industrial air separation with cryogenic distillation method. This process is typically realized by pressure swing adsorption or temperature swing adsorption. H2O and CO2 are the two major components to be removed among the contaminants. In this paper, we establish a mathematical model describing the mass and heat balances in the adsorption bed, and the double-component adsorption/desorption equilibriums of H2O/CO2 on alumina F200. To conduct desorption performance analysis, a one-cycle process consisting of feed, blowdown, and purge step under different operating conditions, such as feed/purge pressure ratio and regeneration temperature, is numerically studied. The effect of heat on the desorption performance of H2O and CO2 is investigated by changing the purge gas temperature within 30 °C to 200 °C under feed/purge pressure ratios of 6:1.1 and 10:1.1, respectively. Detailed results of the H2O and CO2 adsorption/desorption behaviors in the bed are demonstrated. The mass and heat transfer characteristics during desorption are also analyzed. Suggestions on the optimization of the heating temperature and duration of purge gas are also proposed.

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“…The air prepurification unit (APU), to remove impurities such as water vapor (H 2 O) and carbon dioxide (CO 2 ) included in the atmosphere, is essential in a cryogenic ASU, because the impurities solidify and plug the passages in equipment. 1 The typical specifications for H 2 O and CO 2 levels in the compressed feed air are 0.1 and 1 ppm, respectively. 2 The industrial technique of choice for removing such impurities from air is adsorption, such as temperature swing adsorption (TSA) and pressure swing adsorption (PSA).…”

Section: Introductionmentioning

confidence: 99%

“…Through a process of distillation, the air is then separated into its major components. The air prepurification unit (APU), to remove impurities such as water vapor (H 2 O) and carbon dioxide (CO 2 ) included in the atmosphere, is essential in a cryogenic ASU, because the impurities solidify and plug the passages in equipment . The typical specifications for H 2 O and CO 2 levels in the compressed feed air are 0.1 and 1 ppm, respectively …”

Section: Introductionmentioning

confidence: 99%

Comparative Study on the Performance of Adsorbent Bed Regenerated by the Clean and Used Purge Gas Heating

Zhang

Wang

2013

Ind. Eng. Chem. Res.

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The temperature swing adsorption (TSA) process is the most commonly used method for air prepurification units (APU). Compared to the conventional two-bed process, the three-bed TSA-APU can achieve energy savings by recovering and reusing the used purge gas. The purification performance of the three-bed process has recently been demonstrated to be satisfactory by numerical simulation. This study aimed to further characterize the effects of water impurity in the recovered gas on the bed purification performance. Experimental and modeling works were both made on the TSA processes with the conventional regeneration and the regeneration by a used purge heating. Experimental results show that the purification performance of the bed regenerated by a used purge gas heating is still excellent, although it is slightly inferior to that of the bed by conventional regeneration. Comparisons between experimental and modeling results show that the mathematical model can be efficiently employed to predict the dynamic behaviors of adsorbent bed over a wide concentration range.

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The downsizing of a TSA system for an air purification unit using a high flow rate method

Cited by 8 publications

References 4 publications

The Possible Coupling of LNG Regasification Process with the TSA Method of Oxygen Separation from Atmospheric Air

The Possible Coupling of LNG Regasification Process with the TSA Method of Oxygen Separation from Atmospheric Air

Desorption characteristics of H2O and CO2 from alumina F200 under different feed/purge pressure ratios and regeneration temperatures

Comparative Study on the Performance of Adsorbent Bed Regenerated by the Clean and Used Purge Gas Heating

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