TY - JOUR
T1 - Carbon dioxide capture by single droplet using Selexol, Rectisol and water as absorbents
T2 - A theoretical approach
AU - Chen, Wei Hsin
AU - Chen, Shu Mi
AU - Hung, Chen I.
N1 - Funding Information:
The authors gratefully acknowledge the financial support of the National Science Council, Taiwan, ROC, for this study.
PY - 2013/11
Y1 - 2013/11
N2 - A theoretical method is developed to analyze carbon dioxide capture by a stationary single droplet for evaluating the fundamental mass transfer behavior. In the method, the gas-phase diffusion is predicted using a similarity method and the technique of separation of variable is employed to approach the liquid-phase diffusion. At the interface, a finite difference method is applied to connect the CO2 diffusion between the two phases. The individual capture processes of CO2 by three different absorbents of Selexol, Rectisol and water, are taken into account. The operating pressure and temperature of Selexol and water are in the ranges of 30-60atm and 303-333K, respectively, and they are 30-60atm and 240-270K for Rectisol. The analysis indicates that an increase in temperature decreases the CO2 capture amount and absorption time by Selexol and Rectisol droplets. The absorption time is more sensitive to the operating temperature than the capture amount. As a result, the CO2 absorption rates by the droplets are increased when the temperature increases. Among the three absorbents, Rectisol has the highest capacity to capture CO2 and its absorption time is in a comparable state to the other two absorbents. This results in that its absorption rate is larger than the others by an order of magnitude.
AB - A theoretical method is developed to analyze carbon dioxide capture by a stationary single droplet for evaluating the fundamental mass transfer behavior. In the method, the gas-phase diffusion is predicted using a similarity method and the technique of separation of variable is employed to approach the liquid-phase diffusion. At the interface, a finite difference method is applied to connect the CO2 diffusion between the two phases. The individual capture processes of CO2 by three different absorbents of Selexol, Rectisol and water, are taken into account. The operating pressure and temperature of Selexol and water are in the ranges of 30-60atm and 303-333K, respectively, and they are 30-60atm and 240-270K for Rectisol. The analysis indicates that an increase in temperature decreases the CO2 capture amount and absorption time by Selexol and Rectisol droplets. The absorption time is more sensitive to the operating temperature than the capture amount. As a result, the CO2 absorption rates by the droplets are increased when the temperature increases. Among the three absorbents, Rectisol has the highest capacity to capture CO2 and its absorption time is in a comparable state to the other two absorbents. This results in that its absorption rate is larger than the others by an order of magnitude.
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U2 - 10.1016/j.apenergy.2013.05.051
DO - 10.1016/j.apenergy.2013.05.051
M3 - Article
AN - SCOPUS:84879275523
SN - 0306-2619
VL - 111
SP - 731
EP - 741
JO - Applied Energy
JF - Applied Energy
ER -