The recondensation system of boil-off gas (BOG) in LNG (liquefied natural gas) receiving terminal is simulated with software PRO/Ⅱ8.0 aiming to reduce its high energy consumption

and the key process parameters such as the change of the output of LNG

the mass ratio and the BOG temperature are analysed. An optimized process

named the precooling of BOG

is proposed

in which the sub-cooled high pressure LNG is used to cool the BOG from the compressor before it enters into the recondenser aiming at reducing the compression ratio of BOG compressor. The optimized process can save the work of BOG compressor in 32.5% compared with the existing process and can improve the operation flexibility when the downstream system of gas transportation appears fluctuation in gas load between peak and valley. Therefore

the proposed process has better performance for peak-valley adjustment.