• Ocean and Polar Research
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• 제27권4호
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• pp.451-461
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• 2005

The $CO_2$ storage in geologic and oceanic reservoirs is considered to be one of the carbon management strategies for responding to global climate change. Ocean carbon sequestration is purposeful storage acceleration into the ocean of large amounts of carbon that would accumulate in the atmosphere and naturally enter the ocean over a longer timespan. Some technologies for $CO_2$ ocean sequestrations have been developed as a nation project. However, $CO_2$ ocean sequestrations are attractive because they have the advantage of vast capacity sequestration far away from industrial areas, and offer easier monitoring whereas less economic advantage has been indicated as one of the key barriers compared with $CO_2$ geosphere sequestration, which is produced as a byproduct. In this paper, a conceptual design for $CO_2$ ocean sequestration is introduced, and the preliminary examination is described. As a result, the $CO_2$ price, US$ 24/t shows far away from the economics. The causes come from the expensive $CO_2$ recovery cost and the low $CO_2$ price. The expensive $CO_2$ recovery cost is because too much electricity and water are consumed. In order to look for an economic balance point for $CO_2$ ocean sequestration, NPV=0, it is increases the $CO_2$ price. Finally 60.4$ per ton is found to be the balance price.

• 한국세라믹학회지
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• 제51권2호
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• pp.64-71
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• 2014

Accelerated carbonation is a technique that can be used as a CCS technology for $CO_2$ sequestration of approximately 5~20% in a stable solid through the precipitation of carbonate. An alkaline inorganic waste material such as ash, slag, and cement paste are generated from incinerators, accelerated carbonation offers the advantage of lower transport and processing costs at the same generation location of waste and $CO_2$. In this study, we evaluated an amount of $CO_2$ sequestration in various types of inorganic alkaline waste processed by means of accelerated carbonation. A quantitative evaluation of $CO_2$ real sequestration based on a TG/DTA analysis, the maximum 118.88 $g/kg_{-waste}$ of $CO_2$ in paper sludge fly ash, the maximum 134.46 $g/kg_{-waste}$ of $CO_2$ in municipal solid waste incinerator bottom ash, the maximum 9.72 $g/kg_{-waste}$ of $CO_2$ in industrial solid waste incinerator fly ash, and the maximum $18.19g/kg_{-waste}$ of $CO_2$ in waste cement paste.

• Ocean Systems Engineering
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• 제10권3호
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• pp.317-332
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• 2020

This study examines the behaviors and properties of discharged liquid CO₂ from a long elastic pipe moving with a vessel for the oceanic CO₂ sequestration by considering pipe dynamics and vessel motions. The coupled vessel-pipe dynamic analysis for a typical configuration is done in the frequency and time domain using the ORCAFLEX program. The system's characteristics, such as vessel RAOs and pipe-axial-velocity transfer function, are identified by applying a broadband white noise wave spectrum to the vessel-pipe dynamic system. The frequency shift of the vessel's RAO due to the encounter-frequency effect is also investigated through the system identification method. Additionally, the time histories of the tip-of-pipe velocities, along with the corresponding discharged droplet size and Weber numbers, are generated for two different sea states. The comparison between the stiff non-oscillating pipe with the flexible oscillating pipe shows the effect of the vessel and pipe dynamics to the discharged CO₂ droplet size and Weber number. The pipe's axial-mode resonance is the leading cause of the fluctuation of the discharged CO₂ properties. The significant variation of the discharged CO₂ properties observed in this study shows the importance of considering the vessel-pipe motions when designing oceanic CO₂ sequestration strategy, including suitable sequestration locations, discharge rate, towing speed, and sea states.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2009년 춘계학술대회논문집
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• pp.196-201
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• 2009

Global warming issues due to the $CO_2$(Carbon Dioxide) become increasing since the Industrial Revolution. After the Kyoto protocol at 1997, nations which have the prearranged quota drives their national project for the reduction of $CO_2$. Korean Government start to the related big projects in the view of three concepts which have consist of the $CO_2$ exhaust reduction on land, $CO_2$ capture and $CO_2$ storage. Furthermore, the storage method putting into depleted region underground is accepted by the London Convention while the ocean diluted method discharging the liquid $CO_2$ into the deep ocean using the long pipe which is towed by the surface vessel is underway for the research steps which means that there are many potentials for the R&Ds that need for the breakthrough. In this paper, the role and example of the Computational Fluid Dynamics for the feasibility study of the $CO_2$ ocean sequestration is mentioned.

• 한국입자에어로졸학회지
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• 제9권4호
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• pp.201-208
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• 2013

Copper (II) and Nickel (II) mimic complexes of enzyme carbonic anhydrase were evaluated under ambient condition for carbon dioxide capture and conversion process. The synthesized complexes were characterized by ATR-FTIR and UV-DR spectroscopy. It was found that all the complexes have biomimetic activity towards $CO_2$ using para-nitrophenyl acetate (p-NPA) hydrolysis as the model reaction. Interestingly, the proper geometry obtained by the restricted orientation of tripodal N atoms in Cu (II) complex of 2,6-bis(2-benzimidazolyl) pyridine showed the highest activity (1.14 au) compared to others. The $CO_2$ bio-mineralization to $CaCO_3$ was carried out via in-vitro crystallization approach. Results indicate that the biomimetic complexes have a role in determining $CaCO_3$ morphology. The present observations establish a qualitative insight for the design of improved small-molecule catalysts for carbon capture.

• 터널과지하공간
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• 제18권3호
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• pp.175-184
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• 2008

본 고에서는 온실가스 감축방안으로 배출 $CO_2$를 지하심부에 격리 저장시키는 지중 저장기술의 국내외 기술동향을 살펴보고 지반 및 암반공학적 관련기술로서 $CO_2$ 주입에 따른 대상지층의 역학적 안정성 및 누출경로 평가를 위한 열-수리-역학적 연계해석기술 및 적용사례, 기술개발요소를 소개하였다.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2023년도 봄 학술논문 발표대회
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• pp.107-108
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• 2023

In this study, in CO₂ sequestration was carried out through pressure carbonation for concrete slurry water to realize carbon neutrality in the cement industry. As a result of the experiment, it was confirmed that as the pressure of CO₂ increased, the pH decreased and the amount of CaCO₃ produced increased. However, despite the CO₂ pressure of 5 bars, the carbonation reaction for 10 minutes alone did not proceed completely.

• 청정기술
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• 제20권1호
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• pp.42-50
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• 2014

본 논문은 페로니켈 슬래그를 이용하여 간접적으로 $CO_2$를 고정화시키는 기술에 대한 연구를 하였으며, 효율적으로 Mg를 추출하여 제조된 $Mg(OH)_2$의 $CO_2$ 고정화 최적 조건을 제시하고자 하였다. 실험 결과, 최적의 추출조건은 1 M $H_2SO_4$, 반응온도 333 K이었으며, 용출액에 NaOH를 첨가하여 pH값을 8까지 높일 경우, 침전물은 $Fe_2O_3$로 확인되었다. 또한 pH 값이 11까지 높아질 때, 그 성분은 $Mg(OH)_2$로 나타났다. 이렇게 제조된 $Mg(OH)_2$ slurry 용액을 $CO_2$ 고정화실험에서 준 2차 탄산화반응 모델을 통해 적용한 결과, 반응온도 및 초기 $CO_2$분압에 따라 초기 $CO_2$의 고정화 속도를 증진할 수 있는 반면 반응온도가 323 K 이상 높아질 경우, 고정화속도가 감소하는 것으로 나타났다. 또한 $CO_2$ 고정화반응 시 이온을 조사한 결과, $CO_2$를 고정화 할 수 있는 최적의 pH 조건으로 8.38 이상 유지해야 할 것으로 판단되었다. 종합적으로 본 연구에서는 페로니켈 슬래그를 이용하여 $CO_2$를 고정화하기 위한 최적의 조건을 도출하였으며, 향후 $CO_2$를 고정화 하기 위한 연구의 기초자료로 활용할 수 있을 것으로 판단된다.

• 자원환경지질
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• 제38권1호
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• pp.1-22
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• 2005

이산화탄소($CO_2$)는 기후협약에 관한 교토의정서에서 적시한 온실가스 중에서 가장 중요한 물질이다. 이에 세계 각 국은 화석에너지 사용의 효율성 증가, 저탄소 함량의 에너지원, 대체에너지원 개발 등 이산화탄소 배출량을 조절하고 줄이기 위한 기술 개발에 상당한 노력을 기울이고 있다. 그러나 교토의정서에서 제시한 배출량을 만족시키기 위해서 는 이산화탄소 처분 기술의 개발과 적용이 필수적으로 요구된다. 현재까지 개발된 이산화탄소 처분 기술 중에는 심부 대수층 처분, 심부 석탄층 처분, 유전 및 가스전 처분, 탄산염광물화 처분 등의 지중(지질) 처분 기술이 그 안정성 및 환경적 친화성으로 말미암아 가장 적극적으로 고려되고 있다. 본 논문에서는 이산화탄소 지중 처분 기술, 특히 대수 층 처분 및 탄산염광물화 처분 기술의 지구화학적 개념과 기술개발 동향에 대하여 알아보고 또한 각 지중 처분 기술 의 장점과 단점에 대하여 검토하고자 한다.

• 대한약학회:학술대회논문집
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• 대한약학회 2003년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2-2
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• pp.77.2-77.2
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• 2003

The dopamine D2 receptor (D$_2$R) is target for antipsychotic drugs and associated with several neuropsychiatric disorders. The internalization (sequestration) of G protin-coupled receptor is caused by agonist-induced receptor phosphorylation mediated by GRK, followed by the interaction with ${\beta}$-arrestin. In this study, we examined the agonist-dependent sequestration/internalization of dopamine D$_2$R, which were transiently expressed in HEK 293 cells with of without GRK co-expression. Co-expression of GRK2 or GRK3 markedly enhanced the sequestration of D$_2$R. (omitted)