PLANT FOR LIQUEFACTION OF NATURAL GAS (VERSIONS) Russian patent published in 2019 - IPC F25J1/00 

FIELD: cryogenics.

SUBSTANCE: invention relates to cryogenic equipment and can be used for liquefaction of natural gas at gas distribution stations. Plant includes a high-pressure line with a drying unit, which is divided into a production gas line and a process gas line with a preliminary heat exchanger and an expander, which is connected to a return gas line, forming a low-pressure gas line. Production flow line is equipped with a compressor, a cleaning unit, the main heat exchanger, an expander connected to the compressor and a separator with lines of return gas and LNG drainage. On the production gas line downstream the compressor there installed is a heat exchanger "compressed production gas / return gas" and a heat exchanger "compressed production gas / gas of low pressure", after which there is a cleaning unit and a heat exchanger "compressed production gas / reduced process gas". Back gas line downstream the heat exchanger "compressed production gas / return gas" is connected to the line of reduced process gas, as well as with cleaning and drying units, which are connected by regeneration gases supply lines with the line of reduced process gas after the preliminary heat exchanger, forming a low pressure gas line. In the second version of the installation, after the compressor there installed are "compressed production gas / return gas" heat exchangers and a cooler, after which there is a cleaning unit and a heat exchanger "compressed production gas / reduced process gas".

EFFECT: increased yield of liquefied natural gas.

2 cl, 2 dwg