HYDROCARBON GAS DEETHANIZATION PLANT Russian patent published in 2023 - IPC C10L3/10 C10G5/06 F25J3/00 

FIELD: gas industry.

SUBSTANCE: hydrocarbon gas deethanization plant is proposed. The plant includes a dry hydrocarbon gas line divided into two lines. The first line is connected to the first demethanizer, and the first recuperative heat exchanger, reducing device and intermediate separator are installed on the second line. The separator is connected to the first demethanizer by a condensate outlet line with a reducing device and is equipped with an intermediate separation gas outlet line, on which a reflux condenser with a heat and mass exchange unit is installed. The reflux condenser is connected to the first demethanizer by a condensate supply line equipped with a reducing device, and is connected to a low-temperature separator by a reflux gas supply line equipped with a reducing device. The low temperature separator is connected to the first demethanizer by a condensate supply line, and is equipped with a low temperature separation gas supply line connected to the first recuperative heat exchanger. In addition, the first demethanizer is connected by a demethanized condensate supply line to the second demethanizer equipped with an ethane-containing gas outlet line, connected by a wide fraction of light hydrocarbons supply line to a deethanizer equipped with ethane and propane-butane fractions outlet lines. At the same time, three-flow heat exchangers are installed as recuperative heat exchangers. The first dry hydrocarbon gas line is equipped with a heater at the bottom of the first demethanizer and is connected to the second dry hydrocarbon gas line between the first three-way heat exchanger and the reducing device. Also, the low-temperature separation gas supply line is divided into two lines. The first low-temperature separation gas line, equipped with a second recuperative heat exchanger, is connected to the dry stripped gas outlet line after the first three-stream heat exchanger. The first three-flow heat exchanger, a compressor, the second three-flow heat exchanger, a reducing device and a boil-off gas separator are installed on the second low-temperature separation gas line. At the same time, the boil-off gas separator is connected to the first demethanizer by a methane fraction supply line as an acute irrigation, and is connected by a boil-off gas outlet line. The second three-flow heat exchanger is located on the boil-off gas output line, with a dry stripped gas output line after the first three-flow heat exchanger. In addition, the ethane-containing gas outlet line is equipped with a compressor and connected to the second dry hydrocarbon gas line before the first three-way heat exchanger.

EFFECT: technical result of the invention is to increase the yield of ethane by lowering the temperature of the top of the first demethanizer by eliminating the connection of the ethane-containing gas supply line to the first demethanizer and by additionally equipping the first demethanizer with a methane fraction supply line as acute irrigation.

1 cl, 1 dwg, 1 ex