FIELD: chemistry.
SUBSTANCE: invention relates to equipment for extraction of hydrocarbons from low-calorie gaseous mixtures with non-condensed gases containing helium, and can be used in gas industry. Invention relates to an apparatus for extracting helium concentrate from a hydrocarbon-containing gas mixture comprising a demethanizer disposed on a feed gas line and connected to a helium pre-concentration column, as well as recuperative heat exchangers, refrigerating machine, separator and reducing devices. Demethanizer is equipped with upper and lower heat and mass exchange sections in reinforcing part and heater in stripping part, which is located on bypass line of first recuperative heat exchanger, bottom of demethanizer is equipped with hydrocarbon fraction discharge line C1+, on which successively adjacent first bypass line abutment with first reducing device, second reduction device and separator, equipped with liquefied natural gas outlet line and separation gas discharge line, on which the first bypass line connection is sequentially located, the recuperative heat exchanger and adjunction of the second bypass line connected to the raw gas supply line, lower heat-mass-exchange section of demethanizer is connected to refrigerating machine by cooling agent inlet/outlet lines. Demethanizer head is equipped with non-condensed gas mixture discharge line, on which the second recuperative heat exchanger and helium preliminary concentration column are arranged in series, equipped with upper heat-mass-exchange section in reinforcing part and heater in stripping part, which is located on bypass line of second recuperative heat exchanger, wherein the column top is equipped with a helium concentrate discharge line, and the column bottom is with a line of helium-depleted mixture of non-condensed gases, mainly nitrogen, which is divided into two lines, on the first line there arranged in series are a third reduction device, a second recuperative heat exchanger, an upper demetanizer heat-mass exchange section and a first recuperative heat exchanger. On the second line, the fourth reducing device and the upper heat-mass-exchange section of the column are successively located, after which the second line is either withdrawn from the installation, or connected to the first line between the third reducing device and the second recuperative heat exchanger, or between the second recuperative heat exchanger and the upper heat-mass transfer section of the demethanizer, or between the upper heat-mass exchange section of the demethanizer and the first recuperative heat exchanger.
EFFECT: technical result is simplification of installation and increased output of fraction of hydrocarbons C1+ in form of commercial gas and/or liquefied natural gas.
1 cl, 1 dwg
