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안국영(Kook-Young Ahn),김한석(Han-Seok Kim),이윤원(Yun-Won Lee),황철홍(Chul-Hong Hwang) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.11
The oxygen enhanced combustion technology is becoming important to save the energy and capture CO₂. Recently, concern to reduce the CO₂ has led many researchers to investigate the combustion phenomena including O₂ and CO₂ as oxidizer. A method to capture CO₂ using oxidizer control is firing the fuel in pure or highly enhanced oxygen instead of air. When firing fuel in pure oxygen, the flame temperature is much higher than in air. Flue gas, containing chiefly CO₂, recirculation is necessary to reduce the flame temperature. In this paper the combustion characteristics of oxygen enhanced and CO₂ recirculated flame have been investigated. The emission characteristics, flame stability and the flame temperature were studied experimentally. The compositions of oxidizer were varied by substituting N2 with CO₂ at the constant O₂ concentration. As the CO₂ is increased, the flame became unstable and the CO and NO were decreased due to the heat capacity and radiation effect. Also, the combustion characteristics according to the oxygen enhancement were discussed.
안국영,김한석,안진혁,배형수,Ahn, Kook-Young,Kim, Han-Seok,Ahn, Jin-Hyuk,Pae, Hyoung-Su 대한기계학회 2000 大韓機械學會論文集B Vol.24 No.10
The combustion characteristics have been investigated to develop the 50 kW-class gas turbine combustor. The combustor design program was developed and applied to design this combustor. The combustion air which has the temperature of 45, 200, $300^{\circ}C$ were supplied to combustor for elucidating the effect of inlet air temperature on CO, NOx emissions and flame temperature. The exit temperature and NO were increased and CO was decreased with increasing inlet air temperature. Also, the effect of equivalence ratio was considered to verify the combustor performance. The emissions of CO and NO with inlet air temperature can be analyzed qualitatively by measuring the temperature inside the combustor. The combustion performance with fuel schedule was evaluated to get the informations of the starting and part loading process of gas turbine. The combustion was stable above the equivalence ratio of 0.18. The pattern factor which is the important parameter of combustor performance was satisfied with the design criterion. Consequently the combustor was proved to meet the performance goal required for the target gas turbine system.
안국영(Kook Young Ahn),이상민(Sang Min Lee),이영덕(Young Duk Lee) 대한설비공학회 2006 대한설비공학회 학술발표대회논문집 Vol.2006 No.11
CO₂ capture has become an important environmental issue with accelerating global warming problem. Oxyfuel combustion, utilizing oxygen as oxidizer instead of air, has been actively studied since it enables high-purity CO₂ capture with high efficiency. In order to apply oxyfuel combustion to gas turbine systems, a several cycles with new technologies using highly diluted combustion, internal oxygen production have been developed.
Fabrication of Starch-Lauric Acid Nanoparticles for Potential Tumor Therapy
Guk-Young Ahn(안국영),Inseong Choi(최인성),Tae Hoon Yun(윤태훈),Sung-Wook Choi(최성욱) 한국고분자학회 2021 폴리머 Vol.45 No.1
라우르산의 양을 변화시킴으로써 잠재적인 암 요법을 갖는 전분-라우르산(starch-lauric acid; St-LA) 나노 입자를 제조하고 최적화된 St-LA 나노 입자를 발견하였다. 또한 주사 전자 현미경(SEM) 및 푸리에 변환 적외선 분광법(FTIR) 분석을 통해 St-LA 나노 입자가 성공적으로 제조되었음을 확인하였다. 세포 실험에서, St-LA 나노 입자는 A549 및 Caco-2 세포에서 세포 독성을 나타내지만 NIH/3T3 세포는 나타내지 않았음이 LIVE/DEAD 염색 및 형광 이미징에 의해 확인되었다. 따라서 St-LA 나노 입자는 잠재적으로 암 화학 요법에 적용될 수 있을 것으로 판단된다. This manuscript reports on the fabrication of starch-lauric acid (St-LA) nanoparticles having potential cancer therapy. St-LA nanoparticles were fabricated by varying the amount of LA, and the optimized St-LA nanoparticles were found. In addition, it was confirmed that the St-LA nanoparticles were successfully fabricated through scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) analysis. In vitro, the St-LA nanoparticles showed cytotoxicity in A549 and Caco-2 cells but not NIH/3T3 cells. These results were confirmed by LIVE/DEAD staining and fluorescence imaging. Our next goal is to evaluate the St-LA nanoparticles containing various anticancer drugs through in vitro and in vivo studies. St-LA nanoparticles can potentially be applied to cancer chemotherapy.
연소용 공기중 $N_2$의 $CO_2$대체에 대한 연소특성 해석
김한석,안국영,김호근,이윤원,이창언,Kim, Han-Seok,Ahn, Kook-Young,Kim, Ho-Keun,Lee, Yun-Won,Lee, Chang-Eon 한국연소학회 2002 한국연소학회지 Vol.7 No.4
[$CO_2$] is a well-known greenhouse gas, which is the major source of global warming. Many researchers have studied to reduce $CO_2$ emission in combustion processes. The central method of low $CO_2$ emission is Oxygen/CxHy combustion. Theoretically Oxygen/CxHy combustion only produces $CO_2\;and\;H_2O$ and allows convenient recovery of $CO_2$. The combustion characteristics, flame stability, composition in the flame zone and temperature profile were studied experimentally for various compositions of oxidant by substituting $CO_2\;for\;N_2$ with the constant $O_2$ concentration. Results showed that flame became unstable due to the high heat capacity, low transport rate and strong radiation effect of $CO_2$ in comparison with those of $N_2$. The reaction zone was quenched and broadened, as the ratio of $CO_2\;to\;N_2$ was increased. The emission of NOx in flue gas decreased due to the decreased temperature of the reaction zone. As the conversion ratio of $CO_2\;to\;N_2$ was increased, the emission of CO and the higher temperature zone increased due to decrease of reaction rate by the a quenching effect.
동축 공기다단 LPG화염의 NOx 생성특성에 관한 연구
김한석,안국영,김호근,유명종,백승욱,Kim, Han-Seok,Ahn, Kook-Young,Kim, Ho-Keun,Yu, Myung-Jong,Baek, Seung-Wook 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.2
Experimental and numerical studies have been done to examine the effects of excess air ratio and tertiary air swirl number on the formation characteristics of NOx in a pilot scale combustor adopting a multi-air staged burner. In numerical calculation the mathematical models for turbulence, radiation and nitric oxide chemistry were taken into account. The radiative transfer equation was solved using the discrete ordinates method with the weighted sum of gray gases model. In the NOx chemistry model, the chemical reaction rates for thermal and prompt NOx were statistically averaged using a probability density function. The results were validated by comparison with measurements. For the experiment, a 0.2 MW pilot multi-staged air burner has been designed and fabricated. Using the numerical simulation developed here, a variation of thermal and prompt NOx formation was predicted by changing the excess air ratio and tertiary air swirl number. As the excess air ratio increased up to 1.9, the formation of the total as well as thermal NOx at exit increased while the prompt NOx decreased. The formation of thermal NOx was more affected by concentration of $O_2$ and $N_2$ than gas temperature. When the tertiary air swirl number increased, the formation of the total as well as the prompt NOx slightly decreased.