Authors:
Pao Chi Chen
;
Huan Sheng Tseng
;
Zi Qi Lai
and
Zi Xiang Liao
Affiliation:
Department of Chemical and Materials Engineering ;Lunghwa University of Science and Technology and Taiwan, China
Keyword(s):
Carbon dioxide, amine, bubble-column scrubber, Taguchi, mass transfer coefficient
Abstract:
Carbon dioxide emissions are the major climatic change issue in the world. In order to reduce the CO2 emissions, several technologies have been explored, in which absorption is found to be a powerful method. The key factors for an effective absorption are the structure of the scrubbers and solvents adopted. Therefore, this study aimed at absorbing carbon dioxide through a bubble column using AMP+MEA blended amine solution as an absorbent. The reason for using MEA+AMP as the absorbent was that its absorption capacity can be improved and the price was cheaper for both. In addition, the scrubbing factor for a bubble-column scrubber was higher. In the experiment, CO2 absorption was performed by simulating the temperature of the flue gas and the concentration of CO2 in the coal-fired power plant. The liquid flow rate (A), gas flow rate (B), temperature in the column (C) and solution concentration (D) were chosen as the operating factors. There were 4 factors in total, and 3 levels of each
were taken for Taguchi design L9(34). There were a total of 9 groups of experiments. In order to explore the effect of operating variables on the absorption efficiency (E), absorption rate (RA) and overall mass transfer coefficient (KGa), the parameter significance and target operating condition (E=90%; RA=1x10-3 mol/s-L; KGa=0.4 s-1) could be obtained by Taguchi design and Taguchi analysis, so as to serve as a reference for future scale-up design. The results showed that E was in 65.79-98.7%; RA was in 3.54 x10-4-13.9 x10-4mol/s-L; and KGa was in 0.1743-0.3950 s-1. After Taguchi analysis, A and B were found to be significant parameters, and the target condition was confirmed to be A1B1C2D3. In addition, the best condition was also discussed in here.
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