METHODS FOR COLD SUPPLY IN INSTALLATIONS FOR EXTRACTION OF GAS CONDENSATE LIQUIDS Russian patent published in 2021 - IPC C10L3/10 F25J3/06 

FIELD: gas industry.

SUBSTANCE: invention relates to the extraction of gas-condensing liquids. A method for the extraction of gas condensate liquids (natural gas liquids, hereinafter – NGL) includes: the introduction of a supplied natural gas stream into a main heat exchanger, in which the supplied stream is cooled and partially condensed, the introduction of a partially condensed supplied stream into a cold gas-liquid separator, in which the partially condensed supplied stream is divided into a liquid fraction and a gaseous fraction, the introduction of the liquid fraction into a separation or distillation column, the separation of the gaseous fraction into the first part and the second part, cooling of the first part of the gaseous fraction in an upper heat exchanger by indirect heat exchange with a flow of an upper gaseous product discharged from the upper part of the separation or distillation column, and the introduction of the cooled and partially condensed first part of the gaseous fraction into the separation or distillation column at a point located above the point of introduction of the liquid fraction into the separation or distillation column, expansion of the second part of the gaseous fraction, and introduction of the expanded second part of the gaseous fraction into the separation or distillation column at a point located above the point of introduction of the liquid fraction into the separation or distillation column, output of a flow of a liquid product of C2+ or C3+ (NGL) from the lower part of the separation or distillation column, output of a flow of an upper gaseous product from the upper part of the separation or distillation column, wherein the flow of the upper gaseous product is enriched with methane, use of the flow of the upper gaseous product as a cooling medium in the upper heat exchanger and then, in the main heat exchanger, compression of the flow of the upper gaseous product in a compressor unit of residual gas to produce a residual gas stream under pressure, expansion of a part of the residual gas stream under pressure, and use of expanded residual gas as a cooling medium in the upper heat exchanger and in the main heat exchanger, and compression of expanded residual gas used as a cooling medium to form a stream of compressed residual gas, and then combination of the stream of compressed residual gas with the flow of the upper gaseous product upstream from the compressor unit of residual gas.

EFFECT: increase in the efficiency of extracting gas condensate liquid and reducing energy consumption.

29 cl, 5 dwg