순산소연소 이산화탄소 포집을 적용한 석탄가스화 복합화력 발전시스템에서 산소공급방식 변경에 의한 효율향상 분석

• Published in: 한국수소 및 신에너지학회 논문집 Vol. 30; no. 4; pp. 347 - 355
• Main Authors: 조연우(YEON WOO CHO), 안지호(JI HO AHN), 김동섭(TONG SEOP KIM)
• Format: Journal Article
• Language: Korean
• Published: 한국수소및신에너지학회 2019
• Subjects: 기계공학; ITM(이온 전도성 분리 막); IGCC(석탄가스화 복합화력 발전); Carbon capture and storage(이산화탄소 포집 및 저장); Semi-closed(반밀폐); Oxy-combustion(순산소연소)
• ISSN: 1738-7264; 2288-7407

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.