• Journal of the Korean Institute of Gas
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• v.15 no.3
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• pp.1-5
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• 2011

For the hydrogen liquefaction, the large amount of energy is consumed, because precooling, liquefaction and ortho/para conversion heats should be eliminated. In this paper the basic design and thermal analysis are carried out to reduce the energy consumption by using LNG cold energy for precooling process in hydrogen liquefaction processes. The LNG cold energy utilization for hydrogen precooling enables not only to get energy saving for liquefaction, but to recover the wasted cold energy to sea water at the LNG terminal. The results show that the energy saving rate for liquefaction using LNG cold energy is almost 75% of current industrial hydrogen liquefaction plant. The demand flow-rate of LNG is only 15T/D for 1T/D hydrogen liquefaction.

• Journal of the Korean Society for Nondestructive Testing
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• v.29 no.2
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• pp.162-170
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• 2009

As one of promising solutions to overcome high oil price and energy crisis, the construction market of high value-added LNG plants is spotlighted world widely. The purpose of this manuscript is to introduce domestic activities to develop risk assessment technology against overseas monopolization. After analyzing relevant specific features and their technical levels, risk assessment program, non-destructive reliability evaluation strategy and safety criteria unification class are derived as core technologies. These IT-based convergence technologies can be used for enhancement of LNG plant efficiency, in which the modular parts are related to a system with artificial optimized algorithms as well as diverse databases of facility inspection and diagnosis fields.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2007.11a
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• pp.991-994
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• 2007

Since the year of 2003, the overseas plant market has grown by an average of 6% per year. It is because of the increase of oil-money, economic growth of BRICs, and the result of heavy competition among the countries which demands a great amount of resources for the purpose of resource securing. Such a situation is expected to be continued for a while. The procurement is one of critical functions for successful completion of a plant project. For effective procurement, it is required to manage vendor's information efficiently. But most of the vendor management systems deal with simple general information and performance data about vendors. In this sense, this paper proposes a vendor management system which can be used within a decision-making system. The system uses existing DB and makes the close relationship with the vendors. This paper will also reduce risks and difficulties in the process of selecting the proper vendors and will increase efficiency of procurement process in electronic bidding between companies.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.37 no.1
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• pp.1-8
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• 2024

This paper employs stochastic processing techniques to analyze explosion risks in plant facilities based on explosion return periods. Release probability is calculated using data from the Health and Safety Executive (HSE), along with annual leakage frequency per plant provided by DNV. Ignition probability, derived from various researchers' findings, is then considered to calculate the explosion return period based on the release quantity. The explosion risk is assessed by examining the volume, radius, and blast load of the vapor cloud, taking into account the calculated explosion return period. The reference distance for the design blast load model is determined by comparing and analyzing the vapor cloud radius according to the return period, historical vapor cloud explosion cases, and blast-resistant design guidelines. Utilizing the multi-energy method, the blast load range corresponding to the explosion return period is presented. The proposed return period serves as a standard for the design blast load model, established through a comparative analysis of vapor cloud explosion cases and blast-resistant design guidelines. The outcomes of this study contribute to the development of a performance-based blast-resistant design framework for plant facilities.

• Journal of Energy Engineering
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• v.17 no.4
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• pp.175-181
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• 2008

지난 10여년간 한국 사회는 기술적, 경제적, 정치적으로 많은 성장과 변화, 그리고 발전을 거듭하여 세계 13의 경쟁력을 자랑하고 있다. 하지만, 우리나라의 사회적 성장 수준은 세계 30위에 그치고 있어 노령화 정책, 환경 문제, 양극화문제, 균형 발전 등의 사회적 성장과 삶의 질 향상을 위한 노력이 필요한 상황이다. 지속가능한 안전한 삶에 대한 국민적 관심과 요구가 높아지고 있음에도 불구하고 우리 사회는 일상생활과 밀접한 전기 화재 및 가스 사고에서부터 국가 산업 경쟁력 및 심각한 환경문제까지 야기할 수 있는 발전소 혹은 대형 플랜트 사고에 이르기까지 위험 요소를 안고 있다. 이에 본 연구는 이러한 에너지 관련 시설 및 활동으로부터 발생할 수 있는 사고를 예방하고 조치할 수 있는 안전 기술 개발 현황에 대하여 조사하고 이를 바탕으로 향후 국내 에너지 안전 기술의 개발 방향에 대한 의견을 제안하였다. 또한, 국내 가스 및 설비 안전 기술의 현황을 파악하고 이를 토대로 안전 기술의 유형을 분류하여 향후 관련 기술의 방향성 제시를 위해 중장기 TRM(technical road map)을 제시하여 에너지 안전 기술의 경쟁력 확보를 위한 토대를 마련하였다.

• Plant Journal
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• v.12 no.2
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• pp.36-40
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• 2016

At the contract for power plant construction, the penalty appropriation on performance decrease is signed between ordering organization and construction firm. In this, the penalty cost signed must be reasonable value that both of ordering organization and construction firm can accept, therefore the methodology for penalty appropriation is very important. Cogeneration is a system that produces electricity and heat at the same time, therefore the penalty appropriation for cogeneration should be uncertain. Thermoeconomics analyzes various energy costs, however the relation of thermoeconomics and penalty cost may not be analyzed up to now. The aim of this study demonstrates that thermoeconomics can be applied to the penalty appropriation at the performance acceptance test. As the result of CGAM system, if the construction cost is $10,000,000, the value of $6,665,688 was appropriated to the electricity production performance and the value of $3,334,312 was appropriated to the heat production performance. Therefore if one percentage at the electricity production performance decreases, the penalty is $6,666, and one percentage at the heat production performance decrease, we can understand that the penalty is $3,334.

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 2000.11a
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• pp.39-44
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• 2000

석탄가스화 복합발전(IGCC; Integrated Gasification Combined Cycle) 은 석탄을 연료로 사용하면서 NOx, SOx 등 오염물 발생량이 적고 가스터빈을 채용한 복합발전 방식으로 효율이 높은 청정에너지 발전방식이다. 특히 우리나라와 같이 전력생산 분야에서 석탄화력의 비중이 높은('99년 6월 현재 27.8%(한전통계자료)) 우리나라에서 급격히 강화되는 석탄화력발전소에 대한 오염물 배출량 제한에 대처하기 위해 기존 석탄화력의 대안으로써 석탄가스화 복합발전이 부각되고 있다. 본 연구에서 국내에 IGCC 상용설비 도입에 대비하여 참조플랜트로서 Texaco 가스화공정을 채용한 2 case의 IGCC 시스템 연구를 수행하였다.(중략)

• Journal of Welding and Joining
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• v.1 no.1
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• pp.30-36
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• 1983

현재의 세계적 경제발전의 침체는 가까운 장래에 급속한 경기회복으로 전환될 전망을 보여주지는 않는다. 한편으로는 기계·전자공학을 중심으로한 기술의 발전, 정보화 사회로의 변화가 눈에 뛸 정도로 급격히 일어나고 있다. 이와 같은 정세속에서 앞으로의 용접기술에는 무엇을 목표로 어떠한 노력이 이루어져야 하는가에 대해, 일본 용접학회, 일본용접협회의 각종 활동을 중심으로 소개하고자 한다. 또한 에너지의 문제는 현재도, 장래도 세계적으로 가장 중요한 문제의 하나다. 에너지 산업의 제분야-유전의 개발, 석유의 채굴과 파이프라인 수송, 액화석유가스(LPG), 액화 천연가스(LNG)의 수송과 저장, 석탄액화, 나아가서는 원자력, 수력 발전 플랜트의 건조 등등-에 있어서 용접기술의 역할은 매우 크다. 1982년 5월 미국에서 '에너지 이용과 용접기술'을 테마로 한 국제회의가 열렸는데 이 회의에서 보고한 일본의 용접기술에 관한 주제를 여기서도 소개하 고자 한다.

• Journal of Energy Engineering
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• v.25 no.3
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• pp.59-65
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• 2016

MVR evaporation is a method of pressurizing the evaporating steam to raise its temperature with an electric compressor instead of burning fuel and reusing the heat source through the embraced heat exchanger to minimize energy use. MVR desalination system with wind power uses varying wind power instead of stable electricity and can flexibly control the volume of fresh water production. The present study introduces the design, construction and operation of a MVR desalination system of 30ton/day capacity. Experimental results, MVR compression ratio is higher than 1.5, temperature difference of the main heat exchanger is $5{\sim}7^{\circ}C$. This value shows the same performance as the designed value.

• Journal of Navigation and Port Research
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• v.43 no.3
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• pp.143-152
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• 2019

In this paper, the towing stability of the LNG bunker barge was estimated. Currently, LNG bunkering barge is being developed for the bunkering of LNG (Liquefied Natural Gas), an eco-friendly energy source. Since the LNG bunkering barge assumes the form of a towed ship connected to the tow line, the towing stability of the LNG bunker barge is crucial f not only for the safety of the LNG bunker barge but also the neighboring sailing vessels. In the initial stages, a numerical code for towing simulation was developed to estimate the towing stability of the LNG bunkering barge. The MMG (Maneuvering Mathematical modeling Group) model was applied to the equations of motion while the empirical formula was applied to the maneuvering coefficients for use in the initial design stage. To validate the developed numerical code, it was compared with published calculation and model test results. Towing simulations were done based on the changing skeg area and the towing position of the LNG bunkering barge using the developed numerical codes. As a result, the suitability of the designed stern skeg area was confirmed.