关键词: 煤制天然气, Aspen Plus, 过程模拟, (火用)

Abstract: Coal to SNG process has such advantages as simple flowsheet and equipment,high reliability and low investment per heating value. A model was developed using process simulation software Aspen Plus for the process producing SNG from coal,and exergy distribution of the process and exergy loss of each unit were calculated based on the exergy analysis method. In the process,the exergy efficiency of the rectisol unit was the highest,98.22%,and that of the gasification unit was the lowest,58.99%. Exergy loss mainly took place in the gasification unit,accounting for 72.69% of the total exergy loss. The internal exergy loss caused by heat transfer and chemical reactions irreversibility was the major loss in the gasification unit. Optimizing gasification temperature and molar ratio of steam to oxygen could be the key to improving exergy efficiency and reducing exergy loss of the process

Key words: coal to SNG, Aspen Plus, process simulation, exergy