• 자원ㆍ환경경제연구
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• 제18권4호
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• pp.787-813
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• 2009

최근 기후변화가 가장 큰 이슈로 부각되고 있는 가운데 북극의 해빙이 점차 줄어들고 있다는 점을 강조하고 있다. 이에 따라 세계적으로 화석연료를 줄이려는 정책적 움직임을 보이고 있다. 그런데 기후변화로 인한 북극의 해빙 감소를 천연가스 자원개발 측면에서 보면 예전에 비해 오히려 낮은 단위 비용으로 천연가스를 생산할 수 있는 기회를 만들어주고 있는 것이다. 본 논문은 이러한 양자 모순관계에서 북극의 천연가스에 대한 영유권을 갖고 있는 국가들은 어떠한 정책을 갖고 움직이고 있는지를 살펴보고자 하였다. 특히 북극에서 가장 많은 매장량을 갖고 있는 러시아의 북극에서의 천연가스 개발 정책이 향후 세계 천연가스시장에서의 수급에 미칠 영향이 상당할 것으로 분석되는 바, 이에 대한 국가적 대응책이 마련되어져야 할 것이다. 러시아가 2030~2040년대에 매장량이 풍부한 야말 반도에서 생산된 천연가스를 북극항로를 통해 액화천연가스(LNG) 수송선으로 수출하게 되면 세계 천연가스시장의 구조는 새로운 단계로 발전될 것이다. 왜냐하면 이러한 거래 형태는 이전의 천연가스 거래에 있어서 지리적 한계를 뛰어 넘을 뿐만 아니라 이제까지의 파이프라인 가스(PNG) 거래 중심에서 액화천연가스(LNG) 거래 중심으로 무게가 이동하기 때문이다. 한편 우리나라와 같이 북극에 대한 영유권을 갖고 있지 않은 중국이나 일본의 움직임을 살펴보면서 우리에게 주는 타산지석의 교훈을 얻고자 하는 것이다.

• 시스템엔지니어링학술지
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• 제11권1호
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• pp.81-93
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• 2015

Steam Reforming H2 Generation (SRH2G) System is a chemical process to produce hydrogen through steam reforming of hydrocarbon. Largely speaking, there are two types of materials for the SRH2G: 1) Oil and coal, and 2)Natural Gas such as shale gas. From the perspective of cost, quality (purity), and environmental burden (pollution), the latter is much more desirable than the former. For this reason, research on SRH2G using natural gas is actively carried out, and implemented and operated in the various industry. In this paper, we develop a natural gas based SRH2G system via systems engineering approach. Specifically, we first derived stakeholder requirements, followed by systems requirements and finally system architecture via a tailored SE process for plant (called Plant Systems Engineering (PSE) process) based on ISO/IEC 15288. The developed method was applied to iron and steel plant as a case study. Through the case study, by the SE approach, we were convinced that a successful system satisfying stakeholders' requirements within the given constraints can be developed, verified and validated.

• 플랜트 저널
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• 제4권3호
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• pp.54-59
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• 2008

The resonance of boiler is caused by exciting force in the gas path and it generates the vibration by the harmony of boiler's dimensional factor. According to trending toward the boiler of increasing capacity and a bigger size, it has a problem of the vibration at back-pass heating surfaces. We can predict such vibrations as comparison between vortex frequency and gas column's natural frequency. We can't rely on the method for the past decades because of changing parameters, such as an allowable error, gas temperature, gas velocity, Strouhal number. We can reduce the vibration to use the seasoning effect and change the operating condition in coal fired boiler but it's not essential solution. When the vibration occurred in the model boiler, we must measures the acoustic pressure and frequency of places for considering the means. So far, we confirmed the problem from field measures and theoretical analysis about the acoustic vibration of boiler. We installed anti-acoustic baffle in a existing boiler to change the acoustic natural frequency at the cavity, which results in reducing the acoustic vibration. The first, we prove that the acoustic resonance is caused by harmonizing vortex shedding frequency of tube heat surface with acoustic natural frequency of cavity in the range of 650~750 MW loads. The second, the acoustic resonance at the back-pass heating surface has the third order of acoustic natural frequency at the second economizer. We install five anti-acoustic baffles at the second economizer to reducing the resonance. We confirm considerably reducing the acoustic vibration of boiler during the commercial boiler.

• 산업경영시스템학회지
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• 제37권4호
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• pp.82-89
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• 2014

Recently, the mineral resource protection policies and regulations in production countries of natural resources including rare metals are becoming more stringent. Such environment makes which market has malfunction. In other word, those are not perfect or pure market. Therefore because each market of natural resources have special or unique characters, it is difficult to forecast their market prices. In this study, we constructed several models to estimate prices of natural resources using statistical tools like ARIMA and their business indices. And for examples, Indium and Coal were introduced.

• 한국가스학회지
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• 제25권1호
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• pp.30-39
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• 2021

세계적으로 천연가스는 환경적, 정치적, 지역적인 이유로 중요한 에너지원으로 부상하고 있다. 우리나라에서 천연가스는 액화천연가스로 수입하고 있으며, 석탄과 원전을 대체하는 연료나 원료의 활용에서 액화천연가스는 증가하고 있다. 우리나라는 천연가스를 수입에 의존하고 있기 때문에 공급에 대한 안정성분석이 중요하다. 따라서, 본 연구에서는 우리나라 수입구조의 위험도 분석을 통하여 공급리스크를 줄이고 안정적인 공급과 수요를 위한 방안을 제시하였다. 공급위험도를 감소시키기 위해 한 국가로부터의 수입 집중도를 낮춰야 하며, 가스공급안정성 지수 (gas supply security index, GSSI)가 낮은 국가의 수입비중을 낮추고 상대적으로 안정적인 국가인 러시아로부터 수입을 증가시켜야 한다. 또한, 수입국가의 수를 늘리거나 안정적 공급이 가능한 국가와의 관계 유지는 우리나라 수입가스의 공급안정성지표 (total gas supply security index, TGSSI)에 긍정적인 영향을 줄 것으로 분석되었다.

• KEPCO Journal on Electric Power and Energy
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• 제2권3호
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• pp.415-419
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• 2016

As the need for clean coal technology has grown, so has the global research and development efforts into integrated gasification combined cycle (IGCC) plants. An IGCC plant couples a gas turbine to a gasification block. Various technical and economic problems exist in designing such a system. One such problem is the difficulty in realizing economies of scale because the single-train flow capacity of commercial IGCC synthetic gas turbine plants is limited; the capacity does not exceed a net power rating of 300 MW. To address this problem, this study modeled and simulated a synthetic gas turbine with the goal of evaluating the feasibility of a 500 MW or larger IGCC plant. First, a gas turbine with the best output and efficiency was chosen for use with natural gas. The turbine was modeled using GateCycle (a simulation tool), and the integrity of the model validated by comparing the result to the design value. Next, off-design modeling was carried out for a gas turbine with synthetic gas based on its on-design model, and the result was compared with the study result of the gas turbine manufacturer. The simulation confirmed that it is possible to create a large capacity IGCC plant by undertaking the remodeling of a gas turbine designed to use natural gas into one suitable for synthetic gas.

• 에너지공학
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• 제11권3호
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• pp.187-193
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• 2002

가스화복합발전기술은 석탄 또는 중질유 등의 기존 발전연료 뿐만 아니라 잔사유 또는 나무와 같은 다양한 연료를 가스터빈에 사용할 수 있어 차세대 발전방식으로 부각되고 있다. 본 논문은 이러한 가스화 복합발전에서 가스화 하여 나온 저열량의 합성가스를 천연가스연료로 설계된 가스터빈에 사용할 때 가스터빈의 성능을 예측하였다. 이를 위해 제한된 설계 데이터로부터 가스터빈의 거동을 예측하는 시스템 적인 방법을 사용하여 발전용 GE 7FA가스터빈에 설계연료인 천연가스와 4가지의 다른 종류의 합성가스를 사용할 때 가스터빈의 설계조건과 탈 설계조건 성능을 예측하였다.

• 대한기계학회논문집B
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• 제32권1호
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• pp.54-61
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• 2008

Integrated Gasification Combined Cycle (IGCC) power plant converts coal to syngas, which is mainly composed of hydrogen and carbon monoxide, by the gasification process and produces electric power by the gas and steam turbine combined cycle power plant. The purpose of this study is to investigate the influence of using syngas in a gas turbine, originally designed for natural gas fuel, on its performance. A commercial gas turbine is selected and variations of its performance characteristics due to adopting syngas is analyzed by simulating off-design gas turbine operation. Since the heating value of the syngas is lower, compared to natural gas, IGCC plants require much larger fuel flow rate. This increases the gas flow rate to the turbine and the pressure ratio, leading to far larger power output and higher thermal efficiency. Examination of using two different syngases reveals that the gas turbine performance varies much with the fuel composition.

• 대한화학회지
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• 제22권2호
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• pp.105-110
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• 1978

産地가 다른 22種類의 國産無煙炭에 含有되어 있는 黑鉛의 含量을 internal standard method와 direct method로 定量分析하였다. 두 方法으로 實驗한 分析結果는 約 $\pm$ 3%內에서 잘 一致하였다. 各 試料中에 含有되어 있는 無定形炭素와 黑鉛性炭素의 含量比는 地域別로 多小 差異가 있으며 聞慶地區가 14${\sim}$24%,大川地區가 12${\sim}$14%, 江原地區가 3${\sim}$5%로서 江原地區에서 産出되는 無煙炭中의 黑鉛含量이 가장 적음을 알 수 있다.

• 설비공학논문집
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• 제22권8호
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• pp.545-552
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• 2010

Research and development efforts to reduce $CO_2$ emission are in progress to cope with global warming. $CO_2$ emission from fossil fuel fired power plants is a major greenhouse gas source and the post-combustion $CO_2$ capture is considered as a short or medium term option to reduce $CO_2$ emissions. In this study, the application of the post-combustion $CO_2$ capture system, which is based on chemical absorption and stripping processes, to typical fossil fuel fired power plants was investigated. A coal fired plant and a natural gas fired combined cycle plant were selected. Performance of the MEA-based $CO_2$ capture system combined with power plants was analyzed and overall plant performance including the energy consumption of the $CO_2$ capture process was investigated.