FIELD: chemistry.
SUBSTANCE: invention relates to methods for field preparation of hydrocarbon gases and can be used in oil industry for processing associated petroleum gas. Proposed are four embodiments of installation, which includes two compressor stations, recuperative heat exchanger, two separators, three-phase separator, refluxer with external source of cold, as well as reducing devices. In embodiments 3 and 4, the upper part of the dephlegmator is equipped with a heat-mass exchange section. During operation of the first embodiment, the APG of the first separation stages is compressed with the help of the first stage of the first compressor station, mixed with separation gas and stabilization gas, compressed by second stage of first compressor station, cooled in heat exchanger and separated in first separator into residue and gas, which together with hydrate inhibitor is supplied to bottom of dephlegmator, top of which is cooled with coolant supplied from cold source. Reflux gas is withdrawn from the top of the dephlegmator, heated in a heat exchanger and discharged as DGS, and reflux is discharged from the bottom of the dephlegmator. APG of the end separation plant is compressed in the second compressor station and separated in the second separator into gas and a residue fed by pump into three-phase separator after mixing with reduced separation residue. Waste hydrate inhibitor and unstable hydrocarbon condensate are removed from three-phase separator, which after mixing with reduced reflux is supplied to stripping column, from which bottom LPG is removed, and off-gas is removed from top, which is mixed with gas withdrawn from separator, and stabilization gas is obtained.
EFFECT: technical result is reduction of power inputs.
4 cl, 4 dwg
