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• W3048807390 abstract "Abstract In this work, direct air capture (DAC) via adsorption is studied through the design and analysis of two temperature–vacuum swing adsorption (TVSA) cycles. In the first part, a novel way of describing the adsorption of $${hbox {CO}}_{2}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msub> <mml:mtext>CO</mml:mtext> <mml:mn>2</mml:mn> </mml:msub> </mml:math> in presence of water vapor is proposed for co-adsorption kinetic and thermodynamic data gathered from the literature. Secondly, two TVSA cycle designs are proposed: one with a desorption step via external heating, and one with a steam purge. A schematic method for the determination of the cycle step times is proposed and a parametric study on the operating conditions is performed via cycle simulations using a detailed, first principles model. Finally, the two cycles are compared in terms of $${hbox {CO}}_{2}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msub> <mml:mtext>CO</mml:mtext> <mml:mn>2</mml:mn> </mml:msub> </mml:math> production and energy consumption. The parametric study on the desorption time shows that there is a desorption time yielding the highest $${hbox {CO}}_{2}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msub> <mml:mtext>CO</mml:mtext> <mml:mn>2</mml:mn> </mml:msub> </mml:math> production at low energy consumptions. Low evacuation pressures are necessary to reach high $${hbox {CO}}_{2}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msub> <mml:mtext>CO</mml:mtext> <mml:mn>2</mml:mn> </mml:msub> </mml:math> production, but higher evacuation pressures show to be always favorable in terms of specific electrical energy requirements. A steam purge requires an additional thermal energy cost, but it not only allows decreasing the specific electrical energy consumptions, it also enhances $${hbox {CO}}_{2}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msub> <mml:mtext>CO</mml:mtext> <mml:mn>2</mml:mn> </mml:msub> </mml:math> desorption kinetics and allows reaching higher $${hbox {CO}}_{2}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:msub> <mml:mtext>CO</mml:mtext> <mml:mn>2</mml:mn> </mml:msub> </mml:math> productions at milder evacuation pressures. The results of this work present the possibility to directly relate the availability of power and heat to the design of the cycle." @default.
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• W3048807390 date "2020-08-11" @default.
• W3048807390 modified "2023-10-06" @default.
• W3048807390 title "Analysis of direct capture of $${hbox {CO}}_{2}$$ from ambient air via steam-assisted temperature–vacuum swing adsorption" @default.
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• W3048807390 doi "https://doi.org/10.1007/s10450-020-00249-w" @default.
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