• 에너지공학
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• 제8권4호
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• pp.533-539
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• 1999

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.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2010년도 춘계학술대회 초록집
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• pp.113.1-113.1
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• 2010

IGCC(Integrated Coal Gasification and Combined Cycle) plants can be among the most advanced and environmental systems for electric energy generation from various feed stocks and is becoming more and more popular in new power generation fields. In this work, the performance of IGCC plants employing Shell gasification technology and a GE 7FB gas turbine engine was simulated using IPSEpro open-equation modeling environment for different operating conditions. Performance analyses and comparisons of all operating cases were performed based on the design cases. Discussions were focused on gas composition, syngas production rate and overall performance. The validation of key steady-state performance values calculated from the process models were compared with values from the provided heat and material balances for Shell coal gasification technology. The key values included in the validation included the inlet coal flow rate; the mass flow rate, heating value, and composition of major gas species (CO, H2, CH4, H2O, CO2, H2S, N2, Ar) for the syngas exiting the gasifier island; and the HP and MP steam flows exiting the gasifier island.

• 대한기계학회논문집B
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• 제20권5호
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• pp.1735-1742
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• 1996

An entrained flow gasifier simulating the cold mode was tested to estimate its performance for coal gasification and flow characteristics with a developed high speed impinging jet nozzle. The burner was designed for high temperature and high pressure(HTHP) conditions, especially for IGCC(Integrated Coal Gasification Combined Cycle). In order to get proper size of droplets for high viscous liquid such as coal slurry, atomization was achieved by impacting slurry with high speed (over 150m/sec) secondary gas (oxygen/or air)/ Formed water droplets were ranged between 100.mu.m to 20.mu.m in their sizes. The flow characteristics in the gasifier was well understood in mixing between fuel and oxidizer. Both external and internal recirculation zones were closely investigated through experimentation with visualization and numerical solutions from FLUENT CODE.

• 한국수소및신에너지학회논문집
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• 제23권3호
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• pp.264-273
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• 2012

In this paper, two types of integrated gasification combined cycle (IGCC) plants using either an air separation unit (ASU) or an ion transport membrane (ITM), which provide the oxygen required in the gasification process, were simulated and their thermodynamic performance was compared. Also, the influence of adopting a pre-combustion $CO_2$ capture in the downstream of the gasification process on the performance of the two systems was examined. The system using the ITM exhibits greater net power output than the system using the ASU. However, its net plant efficiency is slightly lower because of the additional fuel consumption required to operate the ITM at an appropriate operating temperature. This efficiency comparison is based on the assumption of a moderately high purity (95%) of the oxygen generated from the ASU. However, if the oxygen purity of the ASU is to be comparable to that of the ITM, which is over 99%, the ASU based IGCC system would exhibit a lower net efficiency than the ITM based system.

• 한국건설순환자원학회논문집
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• 제7권2호
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• pp.101-108
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• 2019

본 연구는 석탄가스화발전(IGCC)에서 발생하는 부산물인 CGS에 대한 콘크리트용 잔골재로서의 활용성을 분석한 것이다. 즉, KS F 2527 "콘크리트용 골재"에서 천연 및 용융슬래그 잔골재에 해당하는 품질항목을 중심으로 CGS 1~12회분에 대한 물성평가를 실시하였다. 그 결과, 물리적인 특성으로 입자모양판정실적률, 안정성 및 팽창성은 KS의 품질기준을 전부 만족하였으나, 절건밀도와 흡수율은 7~12회분에서 품질이 불안정한 것으로 나타났다. 입도의 경우 불균일한 굵은 입자분포로 인해 품질이 다소 불안정하였고, 7~12회분은 입자가 너무 굵은 것으로 나타났다. 유해물질 특성으로 0.08mm체 통과량 또한 7~12회분의 일부 수준에서 KS기준을 벗어났으나, 염화물함유량, 점토덩어리, 석탄 및 갈탄은 모두 만족하는 것으로 나타났다. 한편, 화학성분은 1~6회분에서 $SO_3$를 제외하고 전부 만족하였으며, 유해물질 함유량 용출량은 함유량에서 7~12회분의 F를 제외하고 전부 규정치 이내로 나타났다. SEM분석 결과 1~6회분에 비해 7~12회분이 거친 표면성상 및 다공질을 보여 품질이 저하된 것으로 판단되었다. 따라서 향후 콘크리트용 골재로서 활용하기 위해서는 별도 조치를 통한 품질편차 감소가 필요하고, 양질의 골재와 혼합하여 품질을 보완한다면 골재수급난 해소 및 순환자원 활용에 긍정적으로 기여할 수 있을 것으로 판단된다.

• 한국에너지공학회:학술대회논문집
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• 한국태양에너지학회, 한국에너지공학회 1993년도 춘계 공동학술발표회 초록집
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• pp.120-125
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• 1993

석탄가스화 복합사이클 발전시스템에서 스팀터빈 발전시스템은 1차 사이클인 가스터빈사이클에서 나오는 폐열을 이용하여 발생하는 증기로 구동되며, 증기의 일부는 가스화기로 들어가서 가스화 반응에 이용된다. 이와 같은 시스템의 설계나 평가를 위해서는, 주어진 시스템에 대한 열 및 물질수지 정산을 구할 수 있는 능력을 갖추는 것이 필요하다. 본 연구에서는 주어진 시스템의 성능을 평가할 수 있는 프로그램을 개발하여 IGCC(Integrated Gasification Combined Cycle)System의 증기터빈 사이클과 유사한 증기터빈기계의 열 및 물질정사고 성능 해석에 적용하였다. (중략)

• 한국수소및신에너지학회논문집
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• 제23권3호
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• pp.285-292
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• 2012

The integrated gasification combined cycle (IGCC) system is well known for its high efficiency compared with that of other coal fueled power generation system. IGCC offers substantial advantages over pulverized coal combustion when carbon capture and storage (CCS) is required. Commercial plants employ different types of quenching system to meet the purpose of the system. Depending on that, the downstream units of IGCC can be modeled using different operating conditions and units. In case with $CO_2$ separation and capture, the gasifier product must be converted to hydrogen-rich syngas using Water Gas Shift (WGS) reaction. In most WGS processes, the water gas shift reactor is the biggest and heaviest component because the reaction is relatively slow compared to the other reactions and is inhibited at higher temperatures by thermodynamics. In this study, tehchno-econimic assessments were found according to the quench types and operating conditions in the WGS system. These results can improve the efficiency and reduce the cost of coal gasification.

• 한국건축시공학회지
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• 제20권4호
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• pp.331-338
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• 2020

본 연구는 CGS를 콘크리트용 혼합골재로서 활용성을 검토하기 위하여 양호한 입도분포의 부순잔골재(CSa) 및 미립자인 해사와 굵은 입자의 부순잔골재를 혼합한 혼합골재(MS)에 CGS의 치환율 변화에 따른 콘크리트의 기초적 특성 및 내구성을 분석하였다. 실험결과, 슬럼프 및 슬럼프 플로는 CSa 및 MS 모두 CGS 치환율이 증가할수록 증가하였으며, 공기량은 반대로 감소하였다. 압축강도는 CSa를 사용한 경우 CGS 치환율이 증가할수록 저하하였지만, MS를 사용한 경우는 CGS 50 %에서 최대치를 나타내었다. 콘크리트 내구성을 검토한 결과로, 건조수축 및 탄산화 깊이측정의 경우는 CGS 치환율에 따라 양호한 성능을 나타내었다. 하지만, 내동해성에서는 전반적으로 CGS 치환율이 증가할수록 감소하는 것으로 나타났다. 따라서, CGS를 치환 사용하는 혼합잔골재 콘크리트의 경우는 공기량 감소를 보완할 수 있도록 AE제 추가 투입 등의 대책을 수립한다면, 큰 문제 없을 것으로 판단된다.

• 유체기계공업학회:학술대회논문집
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• 유체기계공업학회 1998년도 유체기계 연구개발 발표회 논문집
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• pp.209-214
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• 1998

A thermodynamic simulation method is developed for the process design and the performance evaluation of the gas turbine in IGCC power plant. The present study adopts four clean coal gases derived from four different coal gasification and gas clean-up processes as IGCC gas turbine fuel, and considers the integration design condition of the gas turbine with ASU(Air Separation Unit). In addition, the present simulation method includes compressor performance map and expander choking models for considering the off-design effects due to coal gas firing and ASU integration. The present prediction results show that the efficiency and the net power of the IGCC gas turbines are seperior to those of the natural gas fired one but they are decreased with the air extraction from gas turbine to ASU. The operation point of the IGCC gas turbine compressor is shifted to the higher pressure ratio condition far from the design point by reducing the air extraction ratio. The exhaust gas of the IGCC gas turbine has more abundant wast heat for the heat recovery steam generator than that of the natural gas fired gas turbine.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2010년도 추계학술대회 초록집
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• pp.131.1-131.1
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• 2010

This study was conducted for engineering optimization for the gasification process which is the key factor for success of Taean IGCC gasification plant which has been driven forward under the government support in order to expand to supply new and renewable energy and diminish the burden of the responsibility for the reduction of the green house gas emission. The gasification process consists of coal milling and drying, pressurization and feeding, gasification, quenching and HP syngas cooling, slag removal system, dry flyash removal system, wet scrubbing system, and primary water treatment system. The configuration optimization is essential for the high efficiency and the cost saving. For this purpose, it was designed to have syngas cooler to recover the sensible heat as much as possible from the hot syngas produced from the gasifier which is the dry-feeding and entrained bed slagging type and also applied with the oxygen combustion and the first stage cylindrical upward gas flow. The pressure condition inside of the gasifier is around 40~45Mpg and the temperature condition is up to $1500{\sim}1700^{\circ}C$. It was designed for about 70% out of fly ash to be drained out throughout the quenching water in the bottom part of the gasifier as a type of molten slag flowing down on the membrane wall and finally become a byproduct over the slag removal system. The flyash removal system to capture solid particulates is applied with HPHT ceramic candle filter to stand up against the high pressure and temperature. When it comes to the residual tiny particles after the flyash removal system, wet scurbbing system is applied to finally clean up the solids. The washed-up syngas through the wet scrubber will keep around $130{\sim}135^{\circ}C$, 40~42Mpg and 250 ppmv of hydrochloric acid(HCl) and hydrofluoric acid(HF) at maximum and it is turned over to the gas treatment system for removing toxic gases out of the syngas to comply with the conditions requested from the gas turbine. The result of this study will be utilized to the detailed engineering, procurement and manufacturing of equipments, and construction for the Taean IGCC plant and furthermore it is the baseline technology applicable for the poly-generation such as coal gasification(SNG) and liquefaction(CTL) to reinforce national energy security and create new business models.