LNG 냉열을 이용한 공기액화분리시스템의 시뮬레이션 및 공정 해석

• Published in: 한국수소 및 신에너지학회 논문집 Vol. 30; no. 3; pp. 276 - 281
• Main Authors: 한단비(DANBEE HAN), 백영순(YOUNGSOON BAEK)
• Format: Journal Article
• Language: Korean
• Published: 한국수소및신에너지학회 2019
• Subjects: 기계공학; Cold energy(냉열에너지); Air separation(공기분리); LNG(액화천연가스); Process simulation(공정시뮬레이 션); Air liquefaction(공기 액화)
• ISSN: 1738-7264; 2288-7407

The process of separating oxygen and nitrogen from the air is mainly performed by electric liquefaction, which consumes a lot of electricity, resulting in higher operating costs. On the other hand, when used for cold energy of LNG, electric power can be reduced compared to the electric Linde cycle. Currently, LNG cold energy is used in the cold refrigeration warehouse, separation of air-liquefaction, and LNG cold energy generation in Japan. In this study, the system using LNG cold energy and the Linde cycle process system were simulated by PRO/II simulators, respectively, to cool the elevated air temperature from the compressor to about $-183^{\circ}C$ in the air liquefaction separation process. The required amount of electricity was compared with the latent heat utilization fraction of LNG, the LNG supply pressure, and the LNG cold energy usage. At the air flow rate of $17,600m^3/h$, the power source unit of the Linde cycle system was $0.77kWh/m^3$, compared with $0.3kWh/m^3$.