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Boil‐Off Gas Two‐Stage Compression and Recondensation Process at a Liquefied Natural Gas Receiving Terminal
Author(s) -
Li Yajun,
Wen Mingyang
Publication year - 2017
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201500751
Subject(s) - liquefied natural gas , bog , natural gas , process (computing) , terminal (telecommunication) , engineering , gas consumption , energy consumption , air separation , compressed natural gas , petroleum engineering , natural gas processing , environmental science , process engineering , waste management , mechanical engineering , computer science , peat , chemistry , ecology , telecommunications , operating system , electrical engineering , organic chemistry , oxygen , biology
Due to ship unloading and the change of downstream gas consumption, the boil‐off gas (BOG) and liquefied natural gas outputs fluctuate constantly, causing difficulties in both the design and operation of the BOG handling process. The high energy consumption, instability, and inflexibility of the original process affect the operation cost and running safety of the terminal to a large extent. To address these problems, a two‐stage compression and recondensation process is designed and optimized, based on the original one. Compared with the original process through dynamic simulation, the design process has better stability, benefiting from lower operating pressure and smaller fluctuations of both the pressure and the liquid level in the recondenser. In addition, the power and BOG emission are remarkably reduced, which will soon bring great benefit and recovery of investment cost.