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서상일(Sangil Seo),정의현(Euihyun Jung),박용진(Yongjin Park) 한국정보과학회 1996 한국정보과학회 학술발표논문집 Vol.23 No.2B
본 논문에서는 WWW 상에서의 회의 시스템을 제안하여 기존의 CSCW(Computer Supported Cooperative Work) 시스템이 가지고 있는 전용 시스템의 도입과 공간 제약성이라는 두 가지 큰 단점을 극복하고자 한다. 본 논문에서 제안한 회의 시스템을 이용하면 WWW 상에서 별도의 전용 시스템의 도움을 받지 않고도 웹브라우저(Web Browser)만을 이용하여 시간과 장소에 구애받지 않고 공동 작업을 수행할 수 있다.
김성은(Sungeun Kim),안형준(Hyungjun Ahn),최상민(Sangmin Choi),김태형(Taehyung Kim),서상일(Sangil Seo) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.41
A feasibility study has been conducted on the retrofit project of Youngdong power station unit 1, coal fired 125㎿e, to be converted to 100㎿e oxy-coal combustion system. One of the critical issues is the impurity impacts on optimizing the oxygen and carbon-dioxide systems. Existence of the impurity in the gas stream requires additional separation work for sequestration of CO₂, which degrades net plant efficiency. The aim of this study as a part of conceptual design of oxy-coal combustion power generation system is to examine the effect of the impurity on the CO₂ purification process and to suggest ways to deal with impurity. Impurity sources considered in this research are O₂ purity, excess O₂ and air ingress. CO₂ purity, CO₂ recovery rate and power cost which are obtained from the process evaluation are compared to find out optimized operational mode. The performance of oxy-coal combustion power generation system was evaluated in terms of CO₂ concentration in the flue gas at the inlet of the CO₂ purification unit. In this study, the selection of O₂ purity and air ingress are main factors to the system performance, and measures to control impurity for the optimization of overall system are discussed; 1) O₂ purity selection at different CO₂ purity requirement, 2) excess O₂ ratio considering the combustion efficiency and 3) replacement of excess O₂ with air ingress.
순산소 석탄 연소 발전 시스템의 성능 평가 - 동력 사이클의 열역학적 해석
이광진(Kwangjin Lee),최상민(Sangmin Choi),김태형(Taehyung Kim),서상일(Sangil Seo) 한국연소학회 2010 한국연소학회지 Vol.15 No.2
Power generation systems based on the oxy-coal combustion with carbon dioxide capture and storage (CCS) capability are being proposed and discussed lately. Although a large number of lab scale studies for oxy-coal power plant have been made, studies of pilot scale or commercial scale power plant are not enough. Only a few demonstration projects for oxy-coal power plant are publicized recently. The proposed systems are evolving and various alternatives are to be comparatively evaluated. This paper presents a proposed approach for performance evaluation of a commercial 100 ㎿e class power plant, which is currently being considered for ‘retrofitting’ for the demonstration of the concept. The system is configurated based on design and operating conditions with proper assumptions. System components to be included in the discussion are listed. Evaluation criteria in terms of performance are summarized based on the system heat and mass balance and simple performance parameters, such as the fuel to power efficiency and brief introduction of the second law analysis. Also, gas composition is identified for additional analysis to impurities in the system including the purity of oxygen and unwanted gaseous components of nitrogen, argon and oxygen in air separation unit and CO₂ processing unit.
석탄 순산소 연소 조건에서의 가스 및 입자의 복사 열전달 영향 평가
박상현(Sanghyun Park),채태영(Taeyoung Chae),류창국(Changkook Ryu),양원(Won Yang),김영주(Youngjoo Kim),이성호(Sungho Lee),서상일(Sangil Seo) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.42
In oxy-fuel combustion for CO₂ capture, it is important to understand the influence of increased CO₂ and H₂O concentrations on radiation for the thermal design of the boiler. This study evaluated the effect of gas and particle emissions on the wall heat flux in a simplified furnace for representative gas compositions from oxy- and air-fuel combustion using numerical simulations. The radiation was calculated by the discrete ordinate method with gaseous emission predicted by the weighted sum of gray gases models (WSGGMs). The results show that employing an optimized WSGGM is essential for accurate prediction of wall heat flux in oxy-fuel combustion, especially for larger furnace volumes or under dry FGR conditions. With higher particle concentrations, the wall heat flux increases towards a saturation level, and is dominated by particle emission especially for large furnaces. The lower heat capacity of N₂ in air-fuel combustion leads to reduced heat flux compared to that of oxy-fuel combustion at the same volume flow rates.
미분탄 순산소 버너의 화염 안정성 파악을 위한 실험적 연구
최종균(Chong-Gun Choi),나익환(Ik-Hwan Na),채태영(Tae Young Chae),류태우(Tae-U Yu),양원(Won Yang),강태석(Tae Seok Kang),김태형(Tae Hyung Kim),서상일(Sangil Seo),류승관(Seung Kwan Ryu) 한국연소학회 2009 KOSCOSYMPOSIUM논문집 Vol.- No.39
Oxy-coal combustion is one of the key technologies for CO2 capture in coal power plants. In this study, flame stability of an oxy-puverized coal flame was investigated in two burners: a 300 ㎾ pulverized coal burner in KITECH and a 1 ㎿MW pulverized coal burner in KEPRI. Flame attachment characteristics were observed visually for air and oxy-fuel conditions, and effect of various ratios of primary and secondary oxidants was also investigated. We found that the operating conditions of oxy-PC flame should be determined more carefully than those of air-PC flame, observing characteristics of the flame attachment in various conditions. Based on the information, stable flame could be achieved for various oxygen concentrations in the oxdizer stream. However, more investigation should be performed for design of a real-scale oxy-PC burner.