FIELD: machine building; oil and gas industry.
SUBSTANCE: invention relates to equipment for field preparation of natural gas with simultaneous production of liquefied natural gas (LNG) and can be used in gas industry. Proposed plant comprises inlet and intermediate separators, recuperative heat exchanger, fractionating column with top and bottom heat exchange sections, heat exchanger, separator, reducing devices, and fractionation unit. During operation of the plant, raw natural gas is separated in the inlet separator to produce hydrocarbon condensate and gas, which is divided into two flows. First flow is supplied for cooling to lower heat exchange section of column, mixed with second flow cooled in recuperative heat exchanger, is separated in intermediate separator into hydrocarbon condensate and gas, which is reduced and supplied to the column together with reduced hydrocarbon condensates. From the bottom of the column, the demethanized condensate is fed into a fractionation unit from which products are taken in a given range, note here that part of stripped gas or part of prepared gas is introduced / discharged as coolant. From top of column is removed stripped gas, cooled in heat exchanger, reduced and separated into LNG and prepared gas discharged from the plant after heating in heat exchanger, upper heat exchange column section and recuperative heat exchanger.
EFFECT: technical result consists in increase of output of hydrocarbons C2+ and LNG, as well as elimination of use of external sources of low-temperature cold.
1 cl, 1 dwg
