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전과정 평가(Life Cycle Assessment)방법을 이용한 SOFC 열병합 발전시스템의 환경영향 분석
이영덕(Young Duk Lee),강상규(Sanggyu Kang),안국영(Kook Young Ahn),George Tsatsaronis 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
The environmental impact associated with a solid-oxide fuel-cell (SOFC) power generation system has been assessed using a life cycle assessment (LCA) method. LCA is a technique assessing the environmental aspects associated with a system during its entire life cycle. To calculate the environmental impact of the analyzed system, a commercial software package, SimaPro version 7.3.3., was used; the ReCiPe method, endpoint approach, and the hierarchists perspective were selected for calculating the values. The calculation results reveal that the manufacturing stage and the disposal stage have small contributions to the total environmental impact, which just cover 2.1% to 9.5% and 0.1% to 0.6% of the total, respectively, depending on the assumption made for the lifetime of the SOFC stack and the overall system. The SOFC stack is a dominant contributor to the environmental impact associated with manufacturing; 72% of the total environmental impact of manufacturing comes from the SOFC stack; the remaining balance-of-plant (BOP) components account for 28% of the total environmental impact.
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.
이영덕(Young Duk Lee),이동석(Dong Seok Lee),강상규(Sanggyu Kang),안국영(Kook Young Ahn) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.5
본 논문에서는 1㎾급 SOFC 시스템을 대상으로 다양한 시스템 구성방안을 도출하고, 각각의 효율을 비교하여 효율 극대화를 위한 시스템 최적 구성방안을 제시하고자 하였다. 개질기술로는 수증기 개질, 부분산화개질, 자열개질 등의 기술을 검토하였고, 외부개질과 부분 내부개질 방법을 검토하였다. 개질기에 열을 효율적으로 공급하기 위해서 촉매연소기와 통합된 개질시스템을 고안하여 기존의 보조버너를 이용하는 방식과 비교하였고, 효율향상과 물 공급을 최소화 하기 위해서 애노드 오프가스를 재순환하는 방안을 검토하였다. 공정해석결과, 부분내부개질 기술과 촉매연소 통합형 개질기술, 애노드 오프가스 재순환을 적용하는 사이클의 경우에 57.9%의 높은 효율을 기대할 수 있었다. Eight different concepts for 1㎾-class small SOFC system have been investigated, and a comparison is made based on net system efficiency. Reference concept (case 1) consists of SOFC stack, steam reformer, external burner, air/fuel blower, water pump, catalytic combustor and recuperator. For the reforming options, steam reforming (SR), partial oxidation (POX) and auto-thermal reforming (ATR) have been considered and compared with one another. To improve cycle efficiency, various ideas such as integration between catalytic combustor and reformer, internal reforming, anode offgas recirculation have been applied to SOFC system and the effect on system efficiency has been examined. Among eight concepts, Case 5, adapting catalytic combustor integrated reformer, partial internal reforming and anode offgas recirculation, shows the best efficiency of 57.9%, 26.4% higher than the reference cycle, case 1.
이영덕(Young Duk Lee),이상민(Sang Min Lee),박준홍(Junhong Park),유상석(Sangseok Yu),안국영(Kook Young Ahn) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Future power plants will be required to adopt some type of carbon capture and storage (CCS) technologies to reduce their CO2 emissions. One of distinguished CCS techniques expected to resolve the green house effect is to apply the oxy-fuel combustion technique to power plant, and a lot of research/demonstration programs have been going on in the world. In this paper, CO2-capturing power plants based on gas turbine and oxy-fuel combustion are investigated over several types of configurations. As a prior step, simulation model for 500 ㎹-class combined cycle power plant was set and was used as a reference case. The efficiencies of several power plants was compared and the advantages and disadvanteges was investigated.
김영철(Young-Cheol Kim),이안성(An-Sung Lee),김병옥(Byung-Ok Kim),안국영(Kook-Young Ahn),이영덕(Young-Duk Lee),김경웅(Kyung-Woong Kim) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
This paper shows the rotordynamic characteristics of a turbo blower which is one of BOP(Balance Of Plant) for of a 1㎾ class fuel cell system for domestic use. The rotor-bearing system consists of magnetic shaft, compressor impeller, 2 oil free air foil journal bearings, and thrust bearings. Preliminary design such as critical speed map is considered. Static and dynamic characteristics of the journal and thrust AFB(Air Foil Bearing)s are estimated by the soft elasto-hydrodynamic analysis technique and the perturbation method. Also the natural frequencies, mode shapes, and unbalance response of the rotor-bearing system are analyzed.
외부 개질형 평판형 고체 산화물 연료전지 시스템 구성법에 따른 효율특성
이강훈(Kang Hun Lee),우현탁(Hyun Tak Woo),이상민(Sang Min Lee),이영덕(Young Duk Lee),강상규(Sang Gyu Kang),안국영(Kook Young Ahn),유상석(Sang Seok Yu) 대한기계학회 2012 大韓機械學會論文集B Vol.36 No.3
본 연구에서는 외부 개질기에 열원을 공급하기 위한 시스템 내에 가용한 열에너지의 활용 및 확보에 대한 해석을 위해서 외부 개질기를 연계한 평판형 SOFC 시스템의 해석 모델을 구축하고자 한다. 이러한 해석을 위한 모델 구축을 위해 Matlab simulink® 기반의 ThermoLib module을 사용하였으며, 구축된 해석 모델을 통하여 시스템의 성능 향상을 위한 구성 기법에 대해서 연구를 하였다. 시스템 구성 방법은 기존 시스템의 layout을 바꾸기 위해 공기극 출구가스 재순환 및 외부개질기와 촉매연소기를 통합한 개질반응시스템 적용, 개질기에 공급되는 혼합연료의 예열, 연료극 출구가스의 응축을 통한 연료 농도 향상 등을 고려하였다. 시뮬레이션의 해석 결과에서는 SOFC 시스템에 있어서 일반 연소기를 적용한 기준 시스템에 비하여 촉매 연소기를 사용한 시스템의 전기 효율이 12.13% 향상되었으며, 연료극 출구 가스를 응축시켜 버너로 연소시킨 시스템에서는 열효율이 76.12%로 가장 높았다. A planar solid oxide fuel cell (PSOFC) is studied in its application in a high-temperature stationary power plant. Even though PSOFCs with external reformers are designed for application from the distributed power source to the central power plant, such PSOFCs may sacrifice more system efficiency than internally reformed SOFCs. In this study, modeling of the PSOFC with an external reformer was developed to analyze the feasibility of thermal energy utilization for the external reformer. The PSOFC system model includes the stack, reformer, burner, heat exchanger, blower, pump, PID controller, 3-way valve, reactor, mixer, and steam separator. The model was developed under the Matlab/Simulink environment with Thermolib<SUP>®</SUP> modules. The model was used to study the system performance according to its configuration. Three configurations of the SOFC system were selected for the comparison of the system performance. The system configuration considered the cathode recirculation, thermal sources for the external reformer, heat-up of operating gases, and condensate anode off-gas for the enhancement of the fuel concentration. The simulation results show that the magnitude of the electric efficiency of the PSOFC system for Case 2 is 12.13% higher than that for Case 1 (reference case), and the thermal efficiency of the PSOFC system for Case 3 is 76.12%, which is the highest of all the cases investigated.
외부 개질형 평판형 고체 산화물 연료전지 시스템 구성법에 따른 효율특성
이강훈(Kang Hun Lee),우현탁(Hyun Tak Woo),이상민(Sang Min Lee),이영덕(Young Duk Lee),강상규(Sang Gyu Kang),안국영(Kook Young Ahn),유상석(Sang Seok Yu) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
A planar solid oxide fuel cell (PSOFC) has been studied in the applications of high temperature stationary power plant. Even though a PSOFC with external reformer is easy to apply to distributed generation of electricity, the PSOFC system may sacrifice the system efficiency. In this study, modeling of PSOFC with external reformer has been developed to analyze the feasibility of thermal energy utilization for external reformer. The PSOFC system model includes the PSOFC stack, external reformer, catalytic combustor, burner, and various heat exchangers. The model is developed under Matlab/Simulink environment with Thermolib<SUP>®</SUP> modules. Three different PSOFC system configurations are evaluated to understand the trends of hydrogen supply with appropriate thermal environment. The simulation results show that the magnitude of the efficiency advantage of PSOFC system adopting catalytic combustor over one adopting burner can be as high as 13.2%.