METHOD OF NATURAL GAS LIQUEFACTION AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2015 - IPC F25J1/00 

FIELD: energy industry.

SUBSTANCE: pre-purified and dried natural gas is cooled and condensed in heat exchanger of pre-cooling, and then it is separated by separating the liquid ethane fraction which is directed to fractionation, and the gas flow from the first separator is successively cooled in heat exchanger of liquefaction using the mixed refrigerant, overcooled with gaseous nitrogen in heat exchanger of overcooling, the pressure of the overcooled LNG is reduced in the liquid expander, and the overcooled LNG is directed to separation, then the liquefied gas is directed to the LNG storage tank, the separated gas is directed into the fuel gas system. The unit for liquefying gas comprises heat exchanger of pre-cooling, five separators, two throttles, the heat exchanger of liquefaction, three compressors designed to compress the mixed refrigerant, five air coolers, two pumps, liquid expander, a heat exchanger of overcooling, a turbo expanding assembly comprising an expander and a compressor, two compressors of nitrogen cycle.

EFFECT: reduction of energy consumption required to carry out the process of gas liquefaction.

2 cl, 1 dwg