• 한국연소학회:학술대회논문집
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• 2013.06a
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• pp.65-68
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• 2013

In a syngas cooling system of coal gasification process, fly slag carried by syngas deposit on the surface of heat exchanger. The deposited materials form a fouling layer with several millimeters thickness, disturbing heat transfer between steam and syngas. This study investigates flow and heat transfer characteristics of syngas in helical coil heat exchanger using computational fluid dynamics under clean and fouled surface condition. Process model were also designed and its results are in good agreement with CFD results.

• 에너지협의회보
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• s.52
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• pp.54-61
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• 2000

• Korean Chemical Engineering Research
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• v.52 no.6
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• pp.796-806
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• 2014

The key for the commercial deployment of IGCC power plants or chemical (methanol, dimethyl ether, etc.) production plants based on coal gasification is their economic advantage over plants producing electricity or chemicals from crude oil or natural gas. The better economy of coal gasification based plants can be obtained by co-production of electricity and chemicals. In this study, we carried out the economic feasibility analysis on the process of co-producing electricity and DME (dimethyl ether) using coal gasification. The plant's capacity was 250 MW electric and DME production of 300,000 ton per year. Assuming that the sales price of DME is 500,000 won/ton, the production cost of electricity is in the range of 33~58% of 150.69 won/kwh which is the average of SMP (system marginal price) in 2013, Korea. At present, the sales price of DME in China is approximately 900,000 won/ton. Therefore, there are more potential for lowering the price of co-produced electricity when comparing that from IGCC only. Since the co-production system can not only use the coal gasifier and the gas purification process as a common facility but also can control production rates of electricity and DME depending on the market demand, the production cost of electricity and DME can be significantly reduced compared to the process of producing electricity or DME separately.

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.28 no.5
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• pp.199-205
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• 2018

A geopolymer was produced from coal ash generated from an integrated gasification combined cycle (IGCC) plant and its water resistance was evaluated. For this purpose, the geopolymer specimens were immersed in water for 30 days to measure changes in microstructure and alkalinity of the immersion liquid. Particularly, the experiment was carried out with foaming status of the geopolymers and parameters of room temperature aging condition, and immersion time. The foamed geopolymer containing 0.1 wt% Si-sludge had pores with a diameter of 1 to 3 mm and exhibited excellent foamability. Also, the calcium-silicate-hydrate crystal phase appeared in the foamed geopolymer. In the geopolymer immersion experiment, the pH of the immersion liquid increased with time, because the un-reacted alkali activator remained was dissolved in the immersion liquid. From the pH change of the immersion liquid, it was found that geopolymer reaction in the foamed specimen was completed faster than the non-foamed specimen. Through this study, it was possible to successfully produce foamed and non-foamed geopolymers recycled from IGCC coal ash. Also the necessary data for the safe application of IGCC coal ash-based geopolymers to areas where water resistance is needed were established; for example, the process conditions for room temperature aging time, effect of foaming status, immersion time and so on.

• Journal of Energy Engineering
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• v.24 no.3
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• pp.40-47
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• 2015

Integrated gasification combined cycle (IGCC) power plants not only emit less greenhouse gases and air pollutants than conventional coal-fired power plants, but also use low-price, low-quality, and internationally easily procurable coal. Thus we can benefit from safeguarding energy security through building the IGCC power plant. This paper attempts to value the benefits of energy security enhanced by IGCC power plant. To this end, we report here the results from a contingent valuation survey of randomly selected 600 households. A combination of a double-bounded model and a spike model is applied for the purpose of increasing statistical efficiency and dealing with zero(0) willingness to pay data, respectively. The results show that the respondents are additionally willing to pay 6.05 won for 1kWh of electricity generated from IGCC power plant. In other words, the benefits from safeguarding energy security through building the IGCC power plant are 6.05 won per kWh. Given that the expected amount of generation from the Taean IGCC power plant that is scheduled to be built in late 2015 is 2.27 TWh per year, the benefits are estimated to be 13.74 billion won per year.

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 1998.05a
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• pp.79-84
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• 1998

고압 분류층 가스화기는 탄소전환율을 높이기 위해 고온, 즉 Ash Slagging 조건보다 높은 온도에서 운전된다. 따라서 분류층 가스화기에서 생산되어 배출되는 Raw Syngas는 고온의 현열을 보유하고 있다. 고온의 반응과정으로 인하여 타르나 기타 중탄화수소가 생성되지 않으므로 발생열을 회수하기가 용이하며 가스정제 및 불순물 제거과정도 단순해진다. (중략)

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 1996.10b
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• pp.104-112
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• 1996

석탄공급방식에 따른 250MW급 석탄가스화 복합발전 플랜트의 성능을 생성가스의 발열량 및 발전 효율의 측면에서 살펴보았다. 대상탄은 Illinois No. 6탄, Drayton탄, Buckskin탄 및 Usibelli탄을 사용하였으며, 각 탄에 대하여 건식 및 습식 석탄 공급 방식에 따른 생성가스 및 정화가스의 조성과 IGCC 플랜트의 성능을 비교하였다. 탄소 함량이 높을수록 발전 효율은 증가하는 경향을 나타내었으며, 습식 석탄공급방식보다는 건식 석탄공급방식이 발전효율면에서 유리한 것으로 나타났다.

• Journal of Energy Engineering
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• v.8 no.1
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• pp.174-180
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• 1999

본 연구는 여러 종류의 연소가스들의 연소 특성변수를 판단하여 각 가스들 간의 교체 가능성을 조사하는 것을 목적으로 하고 있다. 천연가스, 메탄가스, IGCC 생성가스의 연소특성, 즉 역화, 비화, 및 황염형성을 분제 버너를 이용하여 판단하였고, 실험 데이터는 연소 다이어그램 상에서 이론 공기량 분률과 입열로 표현하였다. 실험 결과, 메탄은 천연가스와 아무런 운전조건의 변화없이 호환가능하나, 천연가스를 IGCC 생성가스로 치환하고자 할 경우는 화염 안정으로 인하여 버너의 운전변수를 조절하여야만 한다. 이러한 연구결과는 다양한 산지에 따른 각종 천연가스들의 교체가능성 및 타 연료와의 호환가능성을 판단하는 기초자료로 사용될 수 있다.

• 한국연소학회:학술대회논문집
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• 2012.11a
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• pp.53-54
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• 2012

In an IGCC plant, one of the most important issues on fuel flexibility in the lean premixed combustor is combustion instabilities. They are characterized by large amplitude pressure oscillations which are caused by unsteady heat release from the flames. The relationship between the unsteady heat release and flow oscillation can be qualitatively and quantitatively explained by flame transfer function. This paper introduces combustion instability modeling methods based on the flame transfer function approach.

• Proceedings of the KSME Conference
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• 2008.11b
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• pp.2952-2952
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• 2008