|
PREDICTION OF BOIL OFF RATE IN LIQUEFIED NATURAL GAS STORAGE PROCESSES.
|
|
|
T. Wlodek
|
|
|
||
|
|
|
|
1314-2704
|
|
|
||
|
English
|
|
|
17
|
|
|
15
|
|
|
|
|
|
||
|
Liquefied Natural Gas (LNG) is stored in cryogenic tanks at receiving terminals. During the LNG storage some part of LNG evaporates into gas phase. Evaporated LNG is called Boil off Gas (BOG). Heat flow has an influence on evaporation process. It indicates continuous boil-off of small fraction of LNG due to heat flow from the ambient air through tank insulation. Vaporization process causes changes in the composition of stored LNG. Increased vaporization process may negatively affect the stability and safety of the LNG storage process. Rate of vaporization (boil off rate) should be precisely determined. For these reasons different calculation models to determine the LNG boil off rate are shown in this paper, also there are presented some boil off rate calculation results for different Liquefied Natural Gas compositions representing different sources of LNG. Obtained results show that Boil Off Rate is higher for LNG which contains nitrogen. Due to lower bubble temperature nitrogen evaporates first from the LNG, it causes significant LNG density drop in surface layer in storage tank. Difference of densities in surface and bottom layer of stored LNG may cause the stratification process and consequently affect the stability of storage process (higher possibility of danger roll-over phenomenon).
|
|
|
conference
|
|
|
||
|
||
|
17th International Multidisciplinary Scientific GeoConference SGEM 2017
|
|
|
17th International Multidisciplinary Scientific GeoConference SGEM 2017, 27 ? 29 November, 2017
|
|
|
Proceedings Paper
|
|
|
STEF92 Technology
|
|
|
International Multidisciplinary Scientific GeoConference-SGEM
|
|
|
Bulgarian Acad Sci; Acad Sci Czech Republ; Latvian Acad Sci; Polish Acad Sci; Russian Acad Sci; Serbian Acad Sci & Arts; Slovak Acad Sci; Natl Acad Sci Ukraine; Natl Acad Sci Armenia; Sci Council Japan; World Acad Sci; European Acad Sci, Arts & Letters; Ac
|
|
|
405-414
|
|
|
27 ? 29 November, 2017
|
|
|
website
|
|
|
cdrom
|
|
|
2896
|
|
|
Boil Off Rate; BOG; LNG; LNG storage terminals; Vaporization;
|
|