• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 2004.11a
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• pp.121-126
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• 2004

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 2004.05a
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• pp.125-130
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• 2004

• Journal of Hydrogen and New Energy
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• v.30 no.4
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• pp.347-355
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• 2019

As a solution to the growing concern on the global warming, researches are being actively carried out to apply carbon dioxide capture and storage technology to power generation systems. In this study, the integrated gasification combined cycle (IGCC) adopting oxy-combustion carbon capture was modeled and the effect of replacing the conventional air separation unit (ASU) with the ion transport membrane (ITM) on the net system efficiency was analyzed. The ITM-based system was predicted to consume less net auxiliary power owing to an additional nitrogen expander. Even with a regular pressure ratio which is 21, the ITM-based system would provide a higher net efficiency than the optimized ASU-based system which should be designed with a very high pressure ratio around 90. The optimal net efficiency of the ITM-based system is more than 3% higher than that of the ASU-based system. The influence of the operating pressure and temperature of the ITM on system efficiency was predicted to be marginal.

• Environmental Engineering Research
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• v.16 no.1
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• pp.35-39
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• 2011

An integrated gasification combined cycle (IGCC) system has been attracting attention due to its increased energy conversion efficiency and ability to treat various carbonaceous materials. IGCC is also expected to play an important role in the future supply of hydrogen energy. The use of a palladium-based membrane to separate the hydrogen from the synthesis gas stream has been intensively studied due to its exceptional hydrogen-separating capability. However, theoretical research on hydrogen separation is still an unfamiliar area in Korea. First-principle density functional theory was applied in this study to investigate the dissociative adsorption of hydrogen onto a palladium surface. The stability of hydrogen on the surface was theoretically evaluated with various adsorption configurations, partial pressures and temperatures. Further theoretical and experimental studies were also suggested to find a more hydrogen-selective material.

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 1997.10a
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• pp.47-53
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• 1997

Dynamic models have been developed for the coal gasification process by using a modular approach method. The complete unit is divided, for the convenience of the analysis, into several sections, viz. the coal feeding system, the gasifier, the gas cooler, the valves, the pumps, etc. The dynamic behaviour of each section is described in mathematical terms and each term is modulized into several submodels consisting of the complete process. To represent the behaviour of the fluid flow, the hydraulic network is proposed. Results for the more important system variables are presented and discussed. There dynamic models enable process and control engineers to quickly review a wide range of alternative operating and control strategies and help operators to easily understand the process dynamics and eventually can be applied to the design of commercial scale IGCC plants.

• 한국신재생에너지학회:학술대회논문집
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• 2008.10a
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• pp.234-237
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• 2008

분류층 가스화기에서 가스화기 운전 온도는 슬래그의 원활한 배출과 가스화기 성능 등에 영향을 미친다. 가스화기 운전온도는 또한, 석탄 및 산소 소비량에도 영향을 미쳐 궁극적으로는 가스화 플랜트의 주요 설비 용량을 결정하는 주요 요인중의 하나이다. 가스화기 운전 온도가 일정수준 이상으로 증가할 경우 냉가스 효율이 저하되고 가스화 성능에 약 영향을 미친다. 본 논문에서는 Coal 및 Flux 공급장치, 슬래그 배출장치 당의 구성을 설명하고 Flux 투입량에 따른 슬래그 Tcv, 가스화기 성능 등을 예측하였다. 또한, 300MW IGCC 실증 가스화플랜트 엔지니어링을 위한 예비단계로 석회석 투입에 따른 Flux 공급장치를 포함한 Feeding 설비 용량, 슬래그처리설비 용량, 가스화기 내부 및 출구 적정온도를 예측하였다.

• New & Renewable Energy
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• v.9 no.3
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• pp.20-28
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• 2013

The gasification process has developed to convert coal into the more useful energy and material since decades. Despite the numberous design of ones, entrained flow gasifier of the major companies has had an advantage on the market. Because it has a merit of full-scale and high performance plant. In this paper, the gasification technologies of GE energy, Phillips, Siemens and Shell have been reviewed to compare their characteristics and a high performance gasification process was suggested. And the simulation model of gasifiers using Aspen Plus offered the quantitative comparison data for difference designs. The simulation results revealed the poor performance of the slurry feed than dry design. The corresponding cold gas efficiency of 77% is much lower than the 80.3% for the dry feed cases. The exergy analysis of the difference syngas quenching system showed that chemical quenching is superior to another. The results of analysis recommend the two stage gasifier with dry multi-feeder as the energy effective design.

• KEPCO Journal on Electric Power and Energy
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• v.2 no.3
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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.

• Applied Chemistry for Engineering
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• v.2 no.4
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• pp.393-398
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• 1991

An experimental reactor system was devised and employed to examine catalytic coal gasification. A 4-kw tungsten halogen lamp heater combinded with a graphite sample basket coated with silicon nitride film made rapid heating and cooling possible. Also a small graphite cap on the thermocouple tip which located just beneath the sample basket helped remarkably to read real temperatures. Silicon nitride film on the basket and the cap showed very good protection against the reaction between graphite and oxidant gases during the experiments. The weight of specimen could be continuously measured without disturbance.

• Journal of the Korean Institute of Gas
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• v.24 no.5
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• pp.65-73
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• 2020

To reduce the hydrogen production cost through the utilizing the oxygen and improving the capacity factor of water electrolysis used to energy storage of renewable energy, the hybrid hydrogen production process which has dual operating concept of using the water electrolysis as energy storage and oxygen production process for biomass gasification was proposed. Moreover, Techno-economic analysis on this system was quantitatively performed.