(A) study on a continuous $co_2$ capture process using an aqueous ammonia solution = 암모니아수를 이용한 연속 이산화탄소 포집공정에 관한 연구

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A continuous $CO_2$ capture process using an aqueous $NH_3$ solution was investigated in this study. The experiments of continuous $CO_2$ absorption-desorption were performed using a lab-scale experimental apparatus. In order to find out the optimal operating conditions of continuous $CO_2$ capture process using an aqueous $NH_3$ solution, $CO_2$ removal efficiencies were measured under various operating conditions. The removal efficiencies were proportionally increased as the increase of $NH_3$ concentration but kept steady value above 12 wt\%. The removal efficiencies were also increased as the flow rates of gas and absorbent increase but the effects of these parameters on removal efficiencies were weaker than that of $NH_3$ concentration. As the regeneration temperature increased, the removal efficiencies increased rapidly and kept steady value at above specific temperature which defined as an optimal regeneration temperature. The optimal regeneration temperature were $87^\circ C$ for 15 wt\%, $90^\circ C$ for 12 wt\%, $93^\circ C$ for 9 wt\%, $95^\circ C$ for 6 wt\% and $97^\circ C$ for 3 wt\%. As the regeneration temperature increase, $CO_2$ loadings of both absorbents were changed from rapid decrease to steady value and the increased differences of lean and rich $CO_2$ loadings explained increased $CO_2$ removal efficiencies. Through the continuous $CO_2$ capture experiments, it could found out that the optimal operating conditions were 12 wt\% of $NH_3$ concentration, $90^\circ C$ of regeneration temperature with $CO_2$ loadings kept below 0.4. A method based on mole fractions of vapor components at equilibrium was developed for continuous $CO_2$ capture process. It could be understood that the regeneration of $CO_2$ rich absorbent prefers the condition that the mole fraction of $NH_3$ in vapor phase at equilibrium is larger than that of $CO_2$. The mole fractions of $CO_2$ and $NH_3$ in vapor phase at actual regeneration are opposite to those at equil...
Advisors
Hong, Won-Hiresearcher홍원희researcher
Description
한국과학기술원 : 생명화학공학과,
Publisher
한국과학기술원
Issue Date
2011
Identifier
466378/325007  / 020045829
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 생명화학공학과, 2011.2, [ x, 98 p. ]

Keywords

desorption; absorption; carbon dioxide; ammonia; regeneration; 재생; 탈거; 흡수; 이산화탄소; 암모니아

URI
http://hdl.handle.net/10203/29113
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=466378&flag=dissertation
Appears in Collection
CBE-Theses_Ph.D.(박사논문)
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