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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.
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.
김영철(Young-Cheol Kim),안국영(Kook-Young Ahn) 한국유체기계학회 2008 유체기계 연구개발 발표회 논문집 Vol.2008 No.-
For the purpose of high outlet pressure, compactness and low vibration and noise, 2 stage reciprocating air compressors can have various cylinder arrangement opposed, in-line. and V type This paper presents an effective method to calculate the inertia forces and to design counter weight. This method is based on the complex representation for the orbital behavior of the compressor shaft. This method help to find the optimal balancing rate easily to reduce the inertial force or moment. This paper shows that the compressor shaft having single throw remains the residual inertia force and the one having double throws remains the residual inertia moment.
SOFC와 HCCI 엔진을 연계한 고효율 하이브리드 발전시스템의 효율 및 경제성 평가
이영덕(Young Duk Lee),박성호(Sung Ho Park),강상규(Sanggyu Kang),안국영(Kook Young Ahn) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Performance analysis and economic assessment on SOFC-based hybrid power generation systems have been carried out and comparisons have been made with conventional SOFC system. Suggested SOFC hybrid system is a combination of a SOFC and a HCCI type internal combustion engine; through such a combination, significant efficiency improvement and cost reduction have been achieved. To model the every single component and to simulate the overall system, Aspen Plus software was used. To improve the accuracy of simulation results, rigorous model of the core components were developed and embedded into the Aspen Plus using Fortran subroutines. For the economic assessment, LCOE (levelized cost of electricity) were calculated using TRR (total revenue requirement) method under appropriate economic assumptions. As a performance calculation result, the SOFC - HCCI engine hybrid system showed the highest efficiency, 59.5%; which is 7.8% and 0.9% higher efficiency than those of the SOFC simple system and the SOFC-GT hybrid system, respectively. As an economic calculation result, SOFC - HCCI engine hybrid system exhibited the lowest LCOE $0.23/kWh; 12.4% and 7.6% of cost reduction were obtained compared with the other two cases.