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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),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(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.
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.
외부 수증기 연계 SOEC 시스템의 공급 스팀 온도에 따른 시스템 BOP 및 운전 특성 분석
김영상(Young Sang Kim),이영덕(Young Duk Lee),안국영(Kook Young Ahn) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11
SOEC attracts much attention because of its high energy efficiency among many water-electrolysis technologies. SOEC operates at temperatures above 700 degrees Celsius, so that the water required for water-electrolysis must be supplied in the form of steam. When the steam to be supplied to the SOEC is generated by the SOEC system itself, an enormous amount of latent heat is required to vaporize the water, so additional energy must be supplied to the SOEC system. On the other hand, if the steam can be supplied from the outside, a small amount of energy is required to raise the temperature of the low temperature steam, so that the SOEC system can be operated without additional energy supply from outside, which enables efficient water-electrolysis. In this study, we propose the optimized BOP size such as heat exchanger for various steam temperature, and propose the energy efficiency of the system.