FIELD: chemistry.
SUBSTANCE: method allows to extract sales gas with three pressure levels (low, medium and high), C2+ fraction and helium concentrate from natural gas by low-temperature separation, heat exchange and distillation. The plant comprises seven recuperative heat exchangers, two of which are multithreaded, a demethanizer, equipped with plates having different temperatures, and a boiler, two low-temperature separators, a turbo-expander unit, which includes an expansion turbine and a turbocharger, a column for helium pre-concentration with a built-in boiler, a column for helium concentrate extraction with a built-in boiler and a reflux condenser, a liquid pump, piping and six throttles.
EFFECT: increased efficiency of gas processing, ensuring the efficiency and depth of natural gas target components extraction in case of change of the feed gas composition supplied to the plant.
2 cl, 1 dwg
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