FIELD: technological processes.
SUBSTANCE: invention relates to low-temperature separation plants and can be used in gas industry. Disclosed is an installation comprising, in option 1, two recuperative heat exchangers, an external cooling circuit in the evaporator, compressor, condenser and reducing device, three reducing devices, separator, refluxer and demethanizer. According to the second version, instead of external cooling circuit equipment includes compressor, refrigerator and fourth reducing device. During operation of version 1 of the plant, high pressure gas is divided into two streams, the first one is cooled in the first recuperative heat exchanger, and the second one – in the evaporator and in the second recuperative heat exchanger, then flows are combined, reduced and directed to refluxer, cooled by low pressure gas, which is then heated in the first recuperative heat exchanger and discharged. During circulation, the coolant of the external circuit after heating in the evaporator is compressed by a compressor driven by at least one of the expanders, cooled in a condenser and reduced. Reflux gas is reduced and mixed with methane-containing gas to obtain low-pressure gas. Reflux is discharged from refluxer, reduced, weathering to produce weathering gas supplied to low pressure gas line, and is fed via second recovery heat exchanger into demethanizer, from which hydrocarbons C2+ and methane-containing gas. Operation of version 2 is characterized by that the second high-pressure gas stream is compressed by a compressor driven by at least one of the expanders, cooled in a cooler, a second recuperative heat exchanger and reduced.
EFFECT: invention increases output of hydrocarbons C2+.
2 cl, 2 dwg
