Performance of a Carbon Dioxide Removal Process Using a Water Scrubber with the Aid of a Water-Film-Forming Apparatus

• Published in: Waste and biomass valorization 2018-10, Vol.9 (10), p.1827-1839
• Main Authors: Nguyen, Mai Kim Diem, Imai, Tsuyoshi, Yoshida, Wataru, Dang, Loc Thi Thanh, Higuchi, Takaya, Kanno, Ariyo, Yamamoto, Koichi, Sekine, Masahiko
• Format: Article
• Language: English
• Subjects: Absorption; Carbon dioxide; Carbon dioxide removal; Carbon sequestration; Compressed gas; Contact pressure; Drinking water; Engineering; Environment; Environmental Engineering/Biotechnology; Exhaust emissions; Exhaust gases; Gas pressure; Gases; Independent variables; Industrial Pollution Prevention; Original Paper; Pressure; Renewable and Green Energy; Scrubbers; Taguchi methods; Temperature; Vapor phases; Waste Management/Waste Technology; Water treatment
• ISSN: 1877-2641; 1877-265X
• DOI: 10.1007/s12649-017-9951-8

With tap water as a physical solvent to absorb CO 2 from different concentrations of mixed gases (containing CO 2 and N 2 ), an apparatus outfitted with a water-film generator was used to enhance the CO 2 dissolution rate as well as the contact between the liquid and gas phases. The operational pressure in the absorption tank, induced gas pressure, initial CO 2 content, liquid-to-gas ratio, and temperature had a significant effect on the CO 2 removal efficiency and its absorption rate in water. On varying the experimental conditions, the CO 2 removal ability and absorption rate varied from 22.9 to 90.0% and 4.5 × 10 −4 –44.4 × 10 −4  mol s −1  L −1 , respectively. For instance, the removal and absorption rates reached approximately 90.0% and 12.0 × 10 −4  mol s −1  L −1 , respectively, when the experiment was operated at 10 °C and 0.30 MPa of gas pressure with 35% CO 2 inlet gas content and 1.40 liquid-to-gas ratio. Additionally, a statistical tool, the Taguchi method, was applied to evaluate the effects of four parameters thoroughly and systematically. According to the Taguchi analysis results of nine total runs for four independent variables with three levels for each, the two most significant variables for the removal rate were temperature and liquid-to-gas ratio, whereas those for the absorption rate were inlet gas CO 2 concentration and gas compressed pressure. These results may provide evidence to aid in the adoption of this method for large-scale CO 2 capture from exhaust gases.