Analysis of the LNG re-condensation system based on Joule-Thomson cooler

27th International Cryogenics Engineering Conference and International Cryogenic Materials Conference 2018

Dorosz, P.^1 ; Piotrowska, A.^1 ; Pyrka, P.^1 ; Bogdan, P.^2

Wrocaw University of Science and Technology, Wyspiaskiego 27, Wrocaw

50-370, Poland^1

Remontowa LNG Systems Spzoo, Sobieskiego 42, Rumia

84-230, Poland^2

关键词: Cryogenic system;    Joule-Thomson coolers;    Optimization analysis;    Single components;    Thermo dynamic analysis;    Thermodynamic efficiency;    Working mixtures;    Working pressures;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/502/1/012151/pdf
DOI  :  10.1088/1757-899X/502/1/012151

来源: IOP

【 摘 要 】

Nowadays, LNG (Liquefied Natural Gas) has become a significant alternative fuel for both land and marine transport units. Due to formal regulations, gaseous natural gas (boil-off gas-BOG) cannot be released to environment when e.g. ship is docked or truck is out of operation. Stream of BOG can be burnt but this solution should be limited due to ecological reasons. Therefore, re-condensation systems allowing to extend holding time of the storage vessels are currently under strong interest and development. Joule-Thomson (J-T) cooler is simple cryogenic system, well recognized and tested. However, J-T coolers are not commercially available mainly because of very high working pressure and low thermodynamic efficiency. Both problems can be reduced by using gas mixture instead of single component working fluid. This paper presents thermodynamic analysis of the LNG re-condensation system based on Joule-Thomson cooler working in the closed system and supplied with gas mixture. Optimization analysis of the working mixture are presented. Theoretical results have been experimentally verified. Test results are presented and discussed.