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가스터빈과 산소분리공정의 연계 방법에 따른 IGCC 플랜트 성능영향 분석
서석빈,김종진,조상기,이윤경,안달홍 한국에너지학회 1999 에너지공학 Vol.8 No.4
석탄가스화 복합발전 (IGCC ; Integrated Gasification Combined Cycle)에서 가스터빈과 산소분리공간의 연계는 플랜트의 성능과 경제성을 향상시키는 잠재력이 있어 최근에 이에 대한 연구가 다수 수행되었으며, 일부방법은 상용플랜트에 적용이 되고 있다. 본 논문은 가스터빈과 산소분리공정간의 연계방법들에 대해 검토하고 이들 방법을 적용시 IGCC 플랜트 성능을 비교하기위해 Texaco Quench 가스화 공정을 채용한 300MW 급 IGCC를 대상으로 공정모사를 수행하였다. 그 결과, 가스터빈 압축기 출구의 압축공기를 추출하여 산소분리공정에 요구하는 공기의 전량을 공급하는 방법이 가장 플랜트 효율이 좋은 것으로 나타났으며, 플랜트 출력은 산소분리공정의 공기요구량의 75%를 가스터빈에서 추출하여 공급하는 경우에서 최대가 됨을 알수있었다. Integration methods of a Gas Turbine and a Air Separation Unit have a potential to improve plant performance and cost of IFCC. Several studies on those integrations schemes were carried out. Then some of the methods were accually in commercial plants. Thus paper reviewed the integration schemes of a Gas Turbine and a Air Separation Unit. In order to compare the plant performance of IGCC with each scheme, simulation model was developed for IGCC power cycle with Texaco Quench gasification process. The simulation results showed that the thermal efficiency of the plant was appeared to be the best when all of the air consumption required for Air Separation Unit was supplied from the Gas Turbine and the net plant power output was maximized when 75% of the total ASU an requirement was supplied from Gas Turbine.
서석빈,방인철 한국원자력학회 2015 Nuclear Engineering and Technology Vol.47 No.4
In this study, R-123 flow boiling experiments were carried out to investigate the effects ofnanoparticle deposition on heater surfaces on flow critical heat flux (CHF) and boiling heattransfer. It is known that CHF enhancement by nanoparticles results from porous structuresthat are very similar to layers of Chalk River unidentified deposit formed on nuclearfuel rod surfaces during the reactor operation period. Although previous studies haveinvestigated the surface effects through surface modifications, most studies are limited topool boiling conditions, and therefore, the effects of porous surfaces on flow boiling heattransfer are still unclear. In addition, there have been only few reports on suppression ofwetting for decoupled approaches of reasoning. In this study, bare and Al2O3 nanoparticlecoatedsurfaces were prepared for the study experiments. The CHF of each surface wasmeasured with different mass fluxes of 1,600 kg/m2s, 1,800 kg/m2s, 2,100 kg/m2s, 2,400 kg/m2s, and 2,600 kg/m2s. The nanoparticle-coated tube showed CHF enhancement up to 17%at a mass flux of 2,400 kg/m2s compared with the bare tube. The factors for CHFenhancement are related to the enhanced rewetting process derived from capillary actionthrough porous structures built-up by nanoparticles while suppressing relative wettabilityeffects between two sample surfaces as a highly wettable R-123 refrigerant was used as aworking fluid.
서석빈,김종진,안달홍,이성노,박종호 한국에너지학회 2002 에너지공학 Vol.11 No.3
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. IGCC (Integrated Gasification Combined Cycle) power plant is becoming more attractive because it allows that various fuels like coal, heavy oil md even residue oil and wood are used in a gas turbine. This paper presents a prediction of performances of gas turbine when low caloric value syngas fuels produced from the IGCC is used in it originally designed with natural gas fuel. Using a systemic method which predicts a gas turbine behavior with limited design data, when natural gas, design fuel and four other types of syngas are used in GE 7FA gas turbine, its performances are predicted on design and off-design conditions.
가스터빈 설비의 운전신뢰도 향상을 위한 감시시스템 개발
서석빈(Seok-Bin Seo),정재화(Jae-Hwa Chung),박세익(Se-Ik Park),김의식(Ui-sik Lim) 대한설비공학회 2011 대한설비공학회 학술발표대회논문집 Vol.2011 No.7
The present study has been conducted a development of a monitoring system for enhanced reliability of gas turbine. The system can monitor both combustion oscillation and mechanical vibration and analyze the cause of abnormal conditions on gas turbine. The system has an advance to identify mechanical vibration caused by combustion oscillation