Helium extraction and nitrogen removal from LNG boil-off gas

26th International Cryogenic Engineering Conference & International Cryogenic Materials Conference 2016

材料科学;物理学

Xiong, L.^1 ; Peng, N.^1 ; Liu, L.^1 ; Gong, L.^1

Key Laboratory of Cryogenics, Technical Institute of Physics and Chemistry, CAS, Beijing

100190, China^1

关键词: Boil off gas;    Condensation process;    Cryogenic distillations;    Cryogenic separation;    Helium concentrations;    Liquid natural gas;    Nitrogen removal process;    Storage tank;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/171/1/012003/pdf
DOI  :  10.1088/1757-899X/171/1/012003

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The helium bearing boil off gas (BOG) from liquid natural gas (LNG) storage tank in LNG plant, which has a helium concentration of about 1%, has attracted the attention in China as a new helium source. As the BOG is usually reused by re-condensing to recover methane, it is likely to cause continuous accumulation of nitrogen in the unit, thus a nitrogen removal process must be integrated. This paper describes a conceptional cryogenic separation system aiming at recovering methane, helium and nitrogen from BOG based on cryogenic distillation and condensation process.