System for utilize liquefied air cooling to prepare LNG

The utility model relates to a system for utilize liquefied air cooling to prepare LNG, including filter, clean system, first order heat exchanger, choke valve, LNG storage tank, liquefied air storage tank, cryogenic pump, second level heat exchanger, third level heat exchanger, the hot fluid pipeline of filter, clean system, first order heat exchanger, choke valve, LNG storage tank pass through the pipeline and establish ties in proper order, the air supply is connected to the feed inlet of filter, the cold fluid pipeline of liquefied air storage tank, cryogenic pump, second level heat exchanger passes through the pipeline and establishes ties in proper order, the cold fluid pipeline export intercommunication of second level heat exchanger pipeline between choke valve and the LNG storage tank, make full use of liquefied air 's low warm -cold volume, through direct heat transfer, waste heat utilization can accomplish with the precooling and the liquefaction of the natural gas, need not consume a large amount