FIELD: oil and gas industry.
SUBSTANCE: invention relates to apparatus for separating natural gas by low-temperature separation and can be used in gas industry. Natural gas deethanization unit, which includes a recovery heat exchanger, a dephlegmator, reducing devices and a separator, differs by the fact that the reducing devices are installed expanders, kinematically or electrically connected to the chiller drive, on the high pressure gas line there is a drying unit with a purge gas inlet line and a regeneration gas discharge line to the low pressure gas discharge line, then the high pressure gas line is divided into two lines, on one there is a refrigerator with a refrigerating machine, on the other—a recuperative heat exchanger with lines of input/output of low pressure gas, then lines are connected in one line, on which the first expander and the dephlegmator, connected to the separator by the low pressure gas supply line and the dephlegmation gas supply line, on which a second expander is installed, and with a recuperative heat exchanger—a low pressure gas feed line, equipped with a reflux feed line into the demethanizer, to which adjoins line of supply of wide fraction of light hydrocarbons from separator, wherein demethanizer is equipped with liquid hydrocarbon discharge line and methane-containing gas supply line to separator.
EFFECT: technical result is higher yield of liquid hydrocarbons.
1 cl, 1 dwg
