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자료유형
학술저널
저자정보
김수현 (고등기술연구원) 유영돈 (고등기술연구원) 김형택 (아주대학교)
저널정보
한국에너지기후변화학회 에너지기후변화학회지 에너지기후변화학회지 Vol.6 No.1
발행연도
2011.4
수록면
79 - 94 (16page)

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Natural gas consumption as 1st energy in Korea accounted for about 14% in 2009. At present, Korea imports most of natural gas, but the natural gas prices has potential for rising in oil prices and increased demand for natural gas. So, there is a need for the technology development to secure the natural gas supply. One of these technologies is the manufacturing process of synthetic natural gas from coal gasification. In this paper, SNG quality and the emission of carbon dioxide in two different coal-to-SNG processes are discussed by process simulation. One process is the conventional shift and methanation process, and the other is combined shift and methanation process. The conventional process consists of multiple adiabatic fixed-bed reactors and a recycle gas system. The recycle gas is used to limit the temperature rise across a reactor. The feed gas hydrogen content is adjusted slightly above stoichiometric reaction requirement to convert the feed carbon to CH4. The combined process is based on the two reactions, water gas shift and methanation. The combined process has the steam injection to provide additional hydrogen in the CO-rich feed gas and suppress carbon formation in the reactors. Syngas flow rate from coal gasification of 100 Nm3/h was applied to two coal-to-SNG processes, the final SNG production based on the conventional process was 23.90 Nm3/h and that on the combined process was 23.99 Nm3/h. Composition of CH4 in SNG of conventional process was 96.16% and that of combined process was 95.52%. CO in SNG was high in case of Combined process, while H2 in SNG was high in case of Conventional process. Therefore, to meet pipeline quality standards in the future, an additional method to reduce CO in SNG of Combined process or H2 in SNG of Conventional process may be necessary. Total carbon dioxide emission of two processes was same, but CO2 separated in AGR of Conventional process was 21% higher than that of Combined process.

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Abstract
1. 서론
2. SNG 합성공정의 주요 반응 및 공정 종류
3. 전형적인 메탄화 공정과 수성가스와 메탄화 조합공정을 적용한 SNG 제조 공정 구성
4. 전형적인 메탄화 공정과 수성가스와 메탄화 조합 공정을 적용한 SNG 제조 공정의 CO₂ 배출량 비교
5. 결론
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