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정순용(Soon-Yong Jeong),김철웅(Chul-Ung Kim),정광은(Kwang-Eun Jeong),고재천(Jae-Cheon Koh),채호정(Ho-Jeong Chae),김태완(Tae-wan Kim),박현주(Hyunjoo Park),이상봉(Sang-Bong Lee),한정식(Jeongsik Han),정병훈(Byunghun Jeong) 한국추진공학회 2010 한국추진공학회 학술대회논문집 Vol.2010 No.11
석유대체자원을 이용하여 항공유의 제조기술 연구를 수행하고 있는데, 핵심 연구분야인 크게 3분야로 바이오매스, 석탄, 천연가스등으로부터 얻어진 합성가스를 제조하기 위한 전처리 제조분야, 이러한 정제된 합성가스를 사용하여 피셔트롭스(Fischer-Tropsh) 반응단계를 거쳐 탄화수소를 제조하는 단계, 마지막으로 탄화수로부터 항공유에 적합한 upgrading기술인 크래킹(cracking) 및 이성화(isomerization) 반응단계로 구분된다. 본 발표에서는 국내외 연구동향 및 주요단계에 중점기술에 관해 언급하고자 한다. The research for production of jet fuel from petroleum displacement resources such as bio-mass, coal, natural gas mainly consists of three sub-research areas; the fisrt step is the pretreatment for producing a synthetic gas, and the next step is the Fischer-Trophsh reaction process for making hydrocarbons. The last is the upgrading technology for the hydrocarbons to fit a jet fuel specification via cracking and isomerization reactions. This talk presents reaserch trends and main technologies for production of jet fuel derived from petroleum displacement resources.
합성가스로부터 탄화수소제조를 위한 피서트롭스 반응에 관한 촉매 종류 및 반응매체의 영향
김철웅(Chul-Ung Kim),정순용(Soon-Yong Jeong),정광은(Kwang-Eun Jeong),고재천(Jae-Cheon Koh),채호정(Ho-Jeong Chae),김태완(Tae-wan Kim),박현주(Hyunjoo Park),이상봉(Sang-Bong Lee),한정식(Jeongsik Han),정병훈(Byunghun Jeong) 한국추진공학회 2010 한국추진공학회 학술대회논문집 Vol.2010 No.11
석유자원의 고갈에 따라 전 세계적으로 석유대체자원인 석탄, 천연가스 및 바이오매스로부터 합성연료 및 화학물질을 제조하기 위한 피셔트롭스 반응에 관한 많은 연구가 이루어지고 있다. 일반적으로 이러한 피셔트롭스 반응은 주로 스케일 업이 비교적 용이한 고정층 반응기를 사용한 기상반응이 적용되고 있으나, 촉매 기공에서의 확산제어 및 왁스의 생성에 따른 촉매의 비활성화 등의 문제점에 기인하여 최근 들어 초임계 유체를 이용한 반응이 많이 연구되고 있다. 본 연구에서는 피셔트롭스 반응에 관한 담지 촉매 및 반응매체에 관한 좀 더 심도 있는 영향을 고찰하기 위해 다양한 담지촉매를 제조하여 피셔트롭스 반응에 관한 기상반응과 초임계 반응을 비교, 고찰하였다. With petroleum reserves dwindling, interest has been increasing worldwide in Fischer-Tropsch synthesis (FT) as a method of producing synthetic liquid fuels and chemicals from coal, natural gas or biomass. In general, FT synthesis is operated through the gas phase fixed-bed reaction system. Recently, there are lots of study in supercritical fluid due to unique characteristics such as the quick diffusion of reactant gas, effective removal of reaction heat, and the in-situ extraction of high molecular weight hydrocarbon, such as wax. In this study, our major aim is to obtain a deeper insight into the effect of the type of support on the reaction performance over a supported cobalt catalyst in a fixed bed reactor.
가스 및 초임계반응하에서 합성가스로부터 탄화수소 제조를 위한 피서트롭스 반응에 관한 연구
김철웅(Chul-Ung Kim),정순용(Soon-Yong Jeong),정광은(Kwang-Eun Jeong),채호정(Ho-Jeong Chae),김태완(Tae-wan Kim),박현주(Hyunjoo Park),이상봉(Sang-Bong Lee),김정현(Jung-Hyun Kim),한정식(Jeongsik Han),정병훈(Byunghun Jeong) 한국추진공학회 2011 한국추진공학회지 Vol.15 No.3
With petroleum reserves dwindling, interest has been increasing worldwide in Fischer-Tropsch synthesis (FT) as a method of producing synthetic liquid fuels and chemicals from coal, natural gas or biomass. In general, FT synthesis is operated through the gas phase fixed-bed reaction system. Recently, there are lots of study in supercritical fluid due to unique characteristics such as the quick diffusion of reactant gas, effective removal of reaction heat, and the in-situ extraction of high molecular weight hydrocarbon, such as wax. In this study, our major aim is to obtain a deeper insight into the effect of the type of support on the reaction performance over a supported cobalt catalyst in a fixed bed reactor.
Analysis of soil resistance on drilled shafts using proposed cyclic p-y curves in weathered soil
Jeong, Sangseom,Park, Jeongsik,Ko, Junyoung,Kim, Byungchul Techno-Press 2017 Geomechanics & engineering Vol.12 No.3
A fundamental study of drilled shafts-soil systems subjected to lateral cyclic loading in weathered soil was conducted using numerical analyses. The emphasis was on quantifying the soil resistance of laterally cyclic loaded pile using 3D finite element analysis. The appropriate parametric studies needed for verifying the cyclic p-y characteristic are presented in this paper. A framework for determining the cyclic lateral load transfer curve (p-y curves) on the basis of numerical analyses is proposed. Through comparisons with results of field load tests, the three-dimensional numerical methodology in the present study is in good agreement with the general trend observed by in situ measurements and thus, represents a realistic soil-pile interaction for laterally loaded piles in soil than that of existing p-y method. It can be said that a rigorous present analysis can overcome the limitations of existing cyclic p-y methods to some extent by considering the effect of realistic three-dimensional combination of pile-soil forces. The proposed cyclic p-y curve is shown to be capable of predicting the behavior of the drilled shafts in weathered soil.