GAS REFINING PLANT Russian patent published in 2023 - IPC C10L3/10 F25J3/02 F25J3/06 

FIELD: cryogenic engineering.

SUBSTANCE: invention relates to cryogenic engineering and may be used in gas industry for processing hydrocarbon gases. A gas refining plant and a C₂₊ hydrocarbon separation unit, which includes a compressor section of a first detander-compressor unit, a main multi-stream heat exchanger, a separator equipped with separation gas and residue separation outlet lines on a purified and dried gas line, are proposed. The separation gas outlet line is divided into first and second separation gas supply lines, the separation residue outlet line is divided into first and second separation residue supply lines, the first separation residue supply line is connected to the first separation gas supply line with an upper multi-flow heat exchanger, a reducing valve and connected to the top of the rectification column, the second separation residue supply line is equipped with a reducing valve and connected to the middle part of the distillation column, the second separation residue supply line is fitted with a reduction valve and connected to the distillation column middle section, the second separation gas supply line is fitted with the first detander-compressor unit detander section and connected to the distillation column middle section above the second separation residue supply line. The top of the distillation column is fitted with a residue gas outlet line, on which the upper heat exchanger, the main heat exchanger, the connection with the second circulating gas branch after the compressor section of the second detander, the compressor unit, the chilling machine, the first circulating gas branch and the second circulating gas branch are successively arranged. The first circulation gas branch is equipped with a main heat exchanger, an upper heat exchanger and a reduction valve and connected to the top of the distillation column above the first separation gas supply line, the second circulation gas branch is equipped with the detander section of the second detander-compressor unit, upper heat exchanger, main heat exchanger, compressor section of the second detander-compressor unit and connected to the residual gas outlet line before the compressor unit. The bottom of the distillation column is connected to the main heat exchanger by the inlet/outlet lines of the first and second circulation sprinklers, and the bottom of the distillation column is connected to the main heat exchanger by the C₂₊ hydrocarbon fraction outlet line. A separator connected to the distillation column by a supply line for a second separation gas before the distillation column and to the outlet line for a third separation residue, and also a separator connected to the distillation column by a supply line for a fourth separation residue, and to the outlet line for a fourth separation residue before the distillation column is installed in the first separation gas supply line.

EFFECT: invention provides for increase the C₂₊ hydrocarbon fraction extraction degree and reduce diameter of upper part of distillation column.

5 cl, 1 dwg, 1 ex