• Journal of Energy Engineering
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• v.1 no.1
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• pp.49-52
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• 1992

전 세계적으로 사용되고 있는 에너지의 90% 정도가 화석 연료로서 현재의 에너지 사용추세로 보아 21세기초에는 석유와 천연가스가 고갈되고 이후 예측되는 석탄의 가속적인 이용을 감안하면 석탄에너지 자원도 21세기를 넘기기 어려울 것으로 전망된다. 이에 대처하기 위하여 화석연료 대체에너지자원 및 기술개발이 활발히 진행되고는 있으나 핵연료비가 발전원가에 차지하는 비용이 낮고(15%, 석유 약 57%, 석탄 약 60%) 기술집약형으로 복합기술의 파급효과, 그리고 산성비 온실효과 등의 환경오염을 유발하지 않는 청정에너지라는 점에서 현재로는 원자력이 에너지 문제 해결을 위한 대안이라고 하겠다. (중략)

• Journal of Energy Engineering
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• v.12 no.4
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• pp.320-327
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• 2003

A CFD (Computational fluid Dynamics) research is conducted for the investigation of the fuel alteration of MBTU (medium-Btu) gas in IGCC gas turbine combustor. The computational analysis method of the gas turbine combustor is constructed by incorporating MBTU gas reaction and fuel NOx models into commercial CFD code. With the use of the present analysis method, comparisons are made on the flow velocity, the chemical species and the temperature distributions, and on the flame shape and behavior of gas turbine combustor firing natural gas and MBTU gases (coal gas, heavy residue oil gas). Furthermore, the NOx formation characteristics and the turbine matching condition of the combustor are analyzed. Based on the computed analysis results, the present study provides the directions for the redesign and the design modification of IGCC gas turbine combustor firing MBTU gas as alternative fuel.

• Journal of the Korean Institute of Gas
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• v.25 no.6
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• pp.45-52
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• 2021

The government is converting the fuel for trucks, one of the causes of PM in Korea, form diesel to LNG. Mobile LNG station are being developed to solve the problems of insufficient charging infrastructure and facilitate the spread of LNG fuel. In this study, QRA was used th calculate the CA of the facility for a secure design prior to the development of the mobile LNG station and to predict the individual/societal risk the scenario. As a result, the danger of mobile LNG station was in ALARP.

• 한국연소학회:학술대회논문집
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• 2014.11a
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• pp.77-80
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• 2014

• Transactions of the Korean hydrogen and new energy society
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• v.30 no.2
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• pp.111-118
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• 2019

Greenhouse gas emissions have a profound effect on global warming. Various environmental regulations have been introduced to reduce the emissions. The largest amount of greenhouse gases, including carbon dioxide, is produced in the steel industry. To decrease carbon dioxide emission, hydrogen-based iron oxide reduction, which can replace carbon-based reduction has received a great attention. Iron production generates various by-product gases, such as cokes oven gas (COG), blast furnace gas (BFG), and Linz-Donawitz gas (LDG). In particular, COG, due to its high concentrations of hydrogen and methane, can be reformed to become a major source of hydrogen for reducing iron oxide. Nevertheless, continuous COG cannot be supplied under actual operation condition of steel industry. To solve this problem, this study proposed to use two alternative COG-based fuel mixtures; one with natural gas and the other with biogas. Reforming study on two types of mixed gas were carried out to evaluate catalyst performance under a variety of operating conditions. In addition, methane conversion and product composition were investigated both theoretically and experimentally.

• Journal of the Korean Electrochemical Society
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• v.11 no.1
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• pp.42-46
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• 2008

Even though fuel cell have high efficiency when pure hydrogen from gas tank is used as a fuel source, it is more beneficial to generate hydrogen from city gas (mainly methane) in residential application such as domestic or office environments. Thus hydrogen is generated by reforming process using hydrocarbon. Unfortunately, the reforming process for hydrogen production is accompanied with unavoidable impurities. Impurities such as CO, $CO_2$, $H_2S$, $NH_3$, $CH_4$, and $CH_4$ in hydrogen could cause negative effects on fuel cell performance. Those effects are kinetic losses due to poisoning of the electrode catalysts, ohmic losses due to proton conductivity reduction including membrane and catalyst ionomer layers, and mass transport losses due to degrading catalyst layer structure and hydrophobic property. Hydrogen produced from reformer eventually contains around 73% of $H_2$, 20% or less of $CO_2$, 5.8% of less of $N_2$, or 2% less of $CH_4$, and 10ppm or less of CO. This study is aimed at investigating the effect of carbon dioxide on fuel cell performance. The performance of PEM fuel cell was investigated using current vs. potential experiment, long run(10 hr) test, and electrochemical impedance measurement when the concentrations of carbon dioxide were 10%, 20% and 30%. Also, the concentration of impurity supplied to the fuel cell was verified by gas chromatography(GC).

• 한국신재생에너지학회:학술대회논문집
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• 2005.11a
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• pp.436-445
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• 2005

석탄가스화는 화석연료인 석탄을 기존의 공해물질 발생을 90% 이상 줄이면서 고효율로 활용할 수 있는 방법이다. 3톤/일급 pilot급 석탄가스화 설비에서 생산된 CO와 수소가 주성분인 합성가스를 소형 LPG 엔진과 중형 천연가스 엔진에 연계시켜 발전시스템을 구성하였으며 전기생산까지 구현하였다. 합성가스의 고온 집진과 탈황을 자체기술로 구현하여 합성가스내 $H_2S$와 COS 성분들을 1 ppm 이하 정제와 99% 이상의 고온집진 효율을 확인하였다. 선진국들의 설비 규모에 비해서는 극히 열세인 국내 현황이지만, 고온고압의 석탄가스화로부터 탈황과 집진, 전기 생산까지 전 과정을 pilot 설비규모에서 실증하는 성과를 얻었으며 향후 전체 시스템의 최적화와 연속운전 기술의 개발로 이어진다면 중소형 석탄가스화 부분에서는 선진국과 차별화된 틈새시장 실용화 기술의 확보가 가능할 것이다.

• Proceedings of KOSOMES biannual meeting
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• 2017.11a
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• pp.183-183
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• 2017

• Journal of Energy Engineering
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• v.10 no.1
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• pp.1-9
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• 2001

전력 사업 구조 개편과 전력계통 신뢰도에 대한 우려 증대, 풍부하고 저렴한 천연가스, 새로운 대기 오염 규제, 부정전전원의 가치 증대로 인하여 분산형 발전의 수요가 증가하고 있다. 본고에서는 미국의 사례를 중심으로 분사형 전원의 현황을 개략적으로 살펴보고 핵심기술인 왕복동엔진, 가스터빈, 마이크로터빈, 연료전지, 태양광발전 기술들의 특징, 장점, 경제성 등을 서술하고 이 기술들의 활용범위 및 분산형 시스템으로서의 적합성에 대하여 논하며 관련 연구개발, 기존 전력망과의 연계, 문제점과 전망에 대해서 살펴보고자 한다.

• Journal of ILASS-Korea
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• v.24 no.4
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• pp.194-202
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• 2019

A mixture preparation strategy was proposed and evaluated in a diesel-natural gas dual-fuel engine to reduce hydrocarbon (HC) and carbon monoxide (CO) emissions under low load conditions. An experimental investigation was conducted in a single-cylinder compression-ignition engine. Natural gas was supplied with air during the intake stroke, and diesel was injected directly into the combustion chamber during the compression stroke. First, effects of diesel start of energizing (SOE) and natural gas substitution ratio on the combustion and exhaust gas emissions were analyzed. Based on the results, the mixture preparation strategy was established. A low natural gas substitution ratio and a high exhaust gas recirculation (EGR) rate were effective in reducing the HC and CO emissions.