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Language: korean

Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received April 4, 2016
Accepted August 2, 2016

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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전산유체역학을 이용한 이산화탄소 광물 탄산화 반응기 분석: 용액 내 고체 반응물 교반 향상을 위한 내부 구조 설계

CO2 Mineral Carbonation Reactor Analysis using Computational Fluid Dynamics: Internal Reactor Design Study for the Efficient Mixing of Solid Reactants in the Solution

박성언 나종걸 김민준 안진주 이채희¹ 한종훈^†

Seongeon Park Jonggeol Na Minjun Kim Jinjoo An Chaehee Lee¹ Chonghun Han^†

서울대학교 화학생물공학부, 08826 서울시 관악구 관악로 1 ¹(주)아이시스텍, 06660 서울특별시 서초구 서초동 1495-1

School of chemical and biological engineering, Seoul National University, Korea ¹ISYSTECH, 1495-1, Seocho-dong, Seocho-gu, Seoul, 06660, Korea

chhan@snu.ac.kr

Korean Chemical Engineering Research, October 2016, 54(5), 612-620(9), 10.9713/kcer.2016.54.5.612 Epub 6 October 2016

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Abstract

산화 칼슘 수용액을 통해 이산화탄소를 포집하는 수성 광물 탄산화 공정은 안정적으로 이산화탄소를 고립시킬 뿐 아니라 생성물의 부가 가치를 기대할 수 있는 대표적인 CCU (Carbon Capture & Utilization) 기술이다. 이 공정의 핵심은 고체 반응물인 산화칼슘의 용해 속도를 최대로 높이는 것인데, 이를 위해 반응기 전체에 고체 반응물이 균일하게 분포되도록 혼합하는 적절한 반응기의 설계가 필요하다. 본 논문에서는 하루에 40ton의 이산화탄소 포집이 가능한 파일럿 규모의 광물 탄산화 반응기를 대상으로, 반응기의 내부 구조 설계에 따라 고체 반응물의 분산도가 어떻게 변하는지에 대해 전산 유체 역학적 모델링(Computational Fluid Dynamics (CFD) modeling)을 통해 연구하였다. 교반 탱크반응기(stirred tank reactor) 형태를 기반으로 외부 구조는 고정한 상태에서 교반기의 종류/갯수/지름/유격/회전 속도, 칸막이의 높이/너비를 변수로 선정하여 다양한 조합의 경우(case)들을 해석하였다. 각 설계 변수에 대한 민감도를 분석함으로써 각 변수의 영향을 파악하고, 중요한 변수를 판별할 수 있었다. 동시에 고체 부피 분율(solid volume fraction)의 높이 방향 표준 편차가 0.001에 가까운 균일한 분포를 만들 수 있는 내부 설계안을 제안하였다.

Aqueous mineral carbonation process, in which CO2 is captured through the reaction with aqueous calcium oxide (CaO) solution, is one of CCU technology enabling the stable sequestration of CO2 as well as economic value creation from its products. In order to enhance the carbon capture efficiency, it is required to maximize the dissolution rate of solid reactants, CaO. For this purpose, the proper design of a reactor, which can achieve the uniform distribution of solid reactants throughout the whole reactor, is essential. In this paper, the effect of internal reactor designs on the solid dispersion quality is studied by using CFD (computational fluid dynamics) techniques for the pilot-scale reactor which can handle 40 ton of CO2 per day. Various combination cases consisting of different internal design variables, such as types, numbers, diameters, clearances and speed of impellers and length and width of baffles are analyzed for the stirred tank reactor with a fixed tank geometry. By conducting sensitivity analysis, we could distinguish critical variables and their impacts on solid distribution. At the same time, the reactor design which can produce solid distribution profile with a standard deviation value of 0.001 is proposed.

Keywords

CCU Mineral Carbonation Reactor Design Impeller CFD

References

Chae SC, Jang YN, Ryu KW, J. Geological Society of Korea, 45(5), 527 (2009)
Han K, Rhee CH, Chun HD, Korean Chem. Eng. Res., 49(2), 137 (2011)
Chen ZY, O'Connor WK, Gerdemann S, Environ. Prog., 25
LACKNER KS, WENDY CH, BUTT DP, JOYCE EL, SHARP DH, Energy, 20(11), 1153 (1995)
Montes-Hernandez G, et al., J. Hazard. Mater., 161(2), 1347 (2009)
Jana SK, Bhaskarwar AN, Chem. Eng. Sci.
Olajire AA, J. Petrol. Sci. Eng., 109, 364 (2013)
Jin B, Lant P, Chem. Eng. Sci., 59(12), 2379 (2004)
Pangarkar VG, Design of Multiphase Reactors, Wiley, 30-46 (2014).
Zwietering TN, Chem. Eng. Sci., 8(3-4), 244 (1958)
Grenville RK, Mak AT, Brown DA, “An Improved Correlation to Predict ‘‘just suspension’’ Speed for Solid-liquid Mixtures with Axial Flow Impellers in Stirred Tanks,” North American Mixing Forum, June, Victoria, BC, Canada (2010).
Smith J, Warmoeskerken M, Zeef E, in Ho CS, Oldshue JY (Ed.), Flow conditions in vessels dispersing gases in liquids with multiple impellers, AIChE, New York, 107-115(1987).
Harris CK, Roekaerts D, Rosendal FJ, Buitendijk FG, Daskopoulos P, Vreenegoor AJ, Wang H, Chem. Eng. Sci., 51(10), 1569 (1996)
Kasat GR, Khopkar AR, Ranade VV, Pandita AB, Chem. Eng. Sci., 63(15), 3877 (2008)
Murthy BN, Ghadge RS, Joshi JB, Chem. Eng. Sci., 62(24), 7184 (2007)
Micale G, Montante G, Grisafi F, Brucato A, Godfrey J, Chem. Eng. Res. Des., 78(3), 435 (2000)
Jafari R, Chaouki J, Tanguy PA, Int. J. Chem. React. Eng., 10(1) (2012)
Bittorf KJ, Kresta SM, AIChE J., 47(6), 1277 (2001)
Sharma RN, Shaikh AA, Chem. Eng. Sci., 58(10), 2123 (2003)
Khopkar A, et al., Chem. Eng. Sci., 60(8), 2215 (2005)
Ljungqvist M, Rasmuson A, Chem. Eng. Res. Des., 79(5), 533 (2001)
Gohel S, et al., Int. J. Chem. Eng., 2012 (2012)
Ding J, Gidaspow D, AIChE J., 36(4), 523 (1990)