• Journal of Energy Engineering
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• v.2 no.3
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• pp.276-284
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• 1993

This study is to obtain some basic data which are prerequisite for the conceptual design of gasification process based on entrained-bed type gasifier. The Gibbs free energy minimization method is used to analyze the chemical equilibrium in the gasifier. The modeling results which consider the conventional mass balance and heat balance are compared with the experimental data published by Electric Power Research Institute. The analysis shows that the reaction in a entrained-bed gasifier is influenced mainly by the amount of oxidant, by the temperature of gasifier and by the type of coals.

• Journal of the Korea Convergence Society
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• v.8 no.5
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• pp.45-52
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• 2017

In this paper, we investigated the following items for the development of gas safety work mobile app. In this study, which is a follow-up study after the completion of the scenario design and the first, second image extraction of the mobile app based on the initial research that has been studied, 1) Suggested classification of gas works by type classification and risk classification 2) The research and proposal of interaction method for effective interworking of mobile app and worker in many industrial fields of two-hand work have been made. In particular, the development of a mobile app that interacts with the main system that manages not only the gas work but also the field of each industrial field is the first attempt in Korea and has helped the worker to work freely and safely through various interaction methods.

• Proceedings of the Korean Society of Propulsion Engineers Conference
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• 2011.11a
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• pp.721-724
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• 2011

A system to pressurize propellants stored in propellant tanks is necessary to feed liquid-propellants into combustion devices at the required pressure and flowrate without having cavitation in turbo-pumps. A pressurization system can be categorized into pre-pressurization stage and main-pressurization stage. This report is regarding to a main-pressurization system. Pressurization methods for propellant tanks are divided into pressurant gas generating method and pressurant gas feeding method. One of pressurant gas generating methods uses the vaporized oxygen gas from cryogenic liquid oxygen and non-flammable gas. In this report, both advantages and disadvantages for pressurization methods and types of pressurization systems are compared. Especially the characteristics and principle of pressurization system using impulsive control strategy applied in launch vehicles are introduced. Additionally the structure, schematics, and specifications of heat exchanger, which is one of main units in pressurization system are also discussed. This paper can be utilized to generate the conceptual requirements and to design preliminary configuration of pressurization system during the development of launch vehicle.

• Journal of Energy Engineering
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• v.11 no.2
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• pp.81-89
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• 2002

IGCC (Integrated Coal Gasification Combined Cycle) is a technology that generates electric power using coal gasification and gasified fuel. Carbon conversion value of IGCC is higher and the influence on the environment is lower than the pulverized coal power plant. Especially, in the nations where the weight of fossil fuel for power generation is remarkably high like in Korea, IGCC stands out as an alternative plan to cope with sudden limitation for the emissions. In this paper, system design study for the commercial IGCC system which the introduction is imminent to Korea was performed. Two cases of entrained gasification process are adapted, one is FHR(full heat recovery) type IGCC system for high efficiency and the other is Quench type IGCC system for low cost. System simulations using common codes like AspenPlus were performed for each system. In the case of Quench system, system option study and sensitivity analysis of the air extraction rate was performed. Thermal performance result for the FHR system is 42.6% (HHV, Net) and for the quench system is 40% (HHV, net) when 75% air is extracted.

• The Bulletin of The Korean Astronomical Society
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• v.37 no.2
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• pp.153.2-153.2
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• 2012

발사체 추진기관은 추진제 및 각종 고압가스류를 엔진으로 공급하는 기능, 지상에서 추진제를 발사체로 충전/배출하는 기능, 저온 산화제를 냉각하기 위한 순환 기능, 추진제 탱크를 가압하는 기능, 지상에서 온보드 밸브를 구동하는 기능, 내부 공간 및 라인 퍼지 기능 등을 수행한다. 이와 같은 기능을 수행하기 위해 발사체에는 타 시스템과는 별도로 추진기관 원격제어 시스템을 구성한다. 제어 시스템은 크게 온보드 시퀀스 및 추진제 탱크 압력 제어, 추진제 및 고압가스 충전/배출 제어, 발사체 기능 확인, 내부 기밀 확인 및 발사 직전까지의 상태 모니터링을 위해 구성한 지상측정시스템(GMS), 비행 중 추진기관 상태를 모니터링하기 위한 텔레메트리시스템(TMS)으로 분류한다. 본 논문에서는 일반적인 발사체 추진기관 운용 및 제어 개념을 제어 기능, 시스템 구성, 작동 원리의 단계로 사례와 함께 제시하였다.

• Journal of the Korean Institute of Gas
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• v.2 no.1
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• pp.90-98
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• 1998

In order to establish detailed plans for fire protection and reduce the possible fire accidents in the future, collection of domestic and foreign fire accident cases and fundamental analysis are very important. In this study the classification model for fire accidents was developed and the direction to a new model was suggested by comparison ours with the accidents classification model of NFPA of United States of America and Japan. A new developed PC-based database program for fire accidents (FADBS) was used to analyse fire accidents easily and efficiently.

• Journal of the Korean Institute of Intelligent Systems
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• v.14 no.1
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• pp.1-8
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• 2004

In this paper, we propose neural network-based fault diagnosis method to diagnose of sensor in the gas monitoring system. In the proposed method, using thermal modulation of operating temperature of sensor, the signal patterns are extracted from the voltage of load resistance. Also, ART2 neural network is used for fault isolation. The performance and effectiveness of the proposed ART2 neural network based fault diagnosis method are shown by simulation results using real data obtained from the gas monitoring system.

• Proceedings of the Korea Information Processing Society Conference
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• 2021.11a
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• pp.132-135
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• 2021

국내에서 유통되는 일회용 가스라이터 점유율의 약 절반은 국내 유일의 한 공장에서 생산하고 있다. 저렴한 외국산 가스라이터로부터 국내 사업을 보호하기 위해 품질 향상과 원가경쟁력 확보의 중요성이 매우 커진 것이 현실이다. 본 논문에서는 YOLOv4 머신러닝 객체인식 모델과 OpenCV 실시간 이미지 처리 오픈소스를 활용해 개발한 불량품 자동 검출 시스템을 제안한다. 대표적인 불량인 '액화가스 부피 불량품'을 검출하는 시스템을 개발하고 실험을 통해 그 정확성을 검증하였다. 제안한 시스템은 97%의 정확도로 상태를 분류하였으며, 이를 통해 100%의 불량을 검출할 수 있었다.

• Journal of Energy Engineering
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• v.6 no.1
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• pp.104-113
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• 1997

This study aims to develop an analysis model using a commercial process simulator-ASPEN PLUS for an IGCC (Integrated Gasification Combined Cycle) system consisting a dry coal feeding, oxygen-blown entrained gasification process by Shell, a low temperature gas clean up process, a General Electric MS7001FA gas turbine, a three pressure, natural recirculation heat recovery steam generator, a regenerative, condensing steam turbine and a cryogenic air separation unit. The comparison between those results of this study and reference one done by other engineer at design conditions shows consistency which means the soundness of this model. The greater moisture contents in Illinois#6 coal causes decreasing gasifier temperature and the greater ash and sulfur content hurt system efficiency due to increased heat loss. As the results of sensitivity analysis using developed model for the parameters of gasifier operating pressure, steam/coal ratio and oxygen/coal ratio, the gasifier temperature increases while combustible gases (CO＋H2) decreases throughout the pressure going up. In the steam/coal ratio analysis, when the feeding steam increases the maximum combustible gas generation point moves to lower oxygen/coal ratio feeding condition. Finally, for the oxygen/coal ratio analysis, it shows oxygen/coal ratio 0.77 as a optimum operating condition at steam/coal feeding ratio 0.2.

• 한국신재생에너지학회:학술대회논문집
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• 2010.06a
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• pp.115.2-115.2
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• 2010

최근 유가 상승 및 에너지 확보, 경질 원유 생산량 및 부존량 감소로 인하여 대체 석유자원의 개발에 대한 연구 및 관심이 급증하고 있다. 기존의 연소 방식이 아닌 연료를 청정 가스로 전환하여 이용하는 가스화 기술 개발이 진행되고 있다. 석탄은 매장량이 세계적으로 풍부 할뿐만 아니라, 지역적으로도 편재되어 있지 않은 에너지원인 석탄을 활용하는 새로운 발전기술로 환경보전성이 우수하며, 효율이 기존의 발전 시스템보다 뛰어난 에너지 이용기술로 각광받는 분야이다. 석탄 슬러리는 분쇄한 석탄을 믹서를 사용하여 소량의 계면활성제를 첨가하여 제조한다. CWM 제조용 석탄은 대체로 고유수분 5%이하, 회분 10%이하의 석탄이 추천되고 있으며, 수분이나 회분량, 산소함량, 입자의 세공율이 증가할수록 고농도화에 불리한 것으로 나타나고 있다. 연료적 가치를 향상시키기 위해서는 물의 함량을 적게, 즉 석탄의 농도를 증가시키는 것이 중요하다. 일반적인 CWM 규격으로는 석탄농도 65% 이상이 바람직한 것으로 보고되고 있다. 석탄가스화에 연료로 사용되는 CWM의 연료성상 및 미립화 정도, 제조 조건 등에 따라 많은 차이가 발생한다. 본 실험에서는 1.0T/D급 습식 분류층가스화기에서 이용할 CWM의 제조를 위하여 소형 믹서를 이용하여 석탄의 농도에 따른 점도 변화와 석탄의 분쇄입자 크기에 따른 점도 변화, 계면활성제와 첨가제의 농도에 따른 점도 특성을 실험하였다.