NATURAL GAS LIQUEFACTION UNIT Russian patent published in 2013 - IPC F25J1/00 

FIELD: machine building.

SUBSTANCE: natural gas liquefaction unit includes supply and return main lines, the first and the second two-flow heat exchangers that are series located in straight flow direction, an expansion device and a separator, and an adiabatic expansion main line. The unit is equipped with a three-flow heat exchanger located between the first and the second heat exchangers, the first and the second wave expansion machines - compressors and a compression main line connecting a return line in the discharge section to a low-pressure gas line and a supply line after the inlet of the adiabatic expansion main line and passing through compressor parts of the second and the first expansion machines - compressors. The adiabatic expansion main line connects the supply line at the inlet and the return line between the three-flow and the second two-flow heat exchangers and passes in series through an expansion part of the first expansion machine - compressor, the three-flow heat exchanger and the expansion part of the second expansion machine - compressor.

EFFECT: improving operating reliability of a unit when ensuring a product flow that is not contaminated with oil.

1 dwg