METHOD FOR LOW-TEMPERATURE PREPARATION OF NATURAL GAS AND EXTRACTION OF UNSTABLE HYDROCARBON CONDENSATE FROM NATIVE GAS (VERSIONS) AND PLANT FOR ITS REALISATION Russian patent published in 2013 - IPC F25J3/00 

FIELD: heating.

SUBSTANCE: in the plant primary separation of fluid from an input flow is carried out. Methanol is added to the primary separation gas. Cooling of the produced flow is carried out in an air cooling device 7, in parallel first and second recuperative heat exchangers 4, 5 and in a unit of cold reduction and recuperation 9, separation is carried out in a low-temperature separator 10. Low-temperature separation gas is heated in the heat exchanger 4 and in the unit of cold reduction and recuperation 9, afterwards it is sent into a product gas pipeline. The primary separation condensate is sent for degassing and separation of a water or a water-methanol phase to the first three-phase separator 11, from which the extracted gas is supplied to the inlet into the low-temperature separator 10, and the condensate is heated in the third recuperative heat exchanger 6 and a bottom heater 14, afterwards it is sent into the lower separation part of a rectification tower 15. The low-temperature separation condensate is heated in the heat exchanger 5 and exposed to degassing and separation of the water-methanol phase in the second three-phase separator 12, afterwards the condensate is supplied into the rectification tower 15 for irrigation. The gas from the rectification tower 15 and the degassing gas from the second three-phase separator 12 are compressed in a compression unit 16 and mixed with the low-temperature separation gas. The condensate from the rectification tower 15 is cooled in the third recuperative heat exchanger 6 and the second air cooling device 8 and is sent to separation of the water-methanol phase into the third three-phase separator 13, additionally compressed and sent to a product condensate pipeline 41.

EFFECT: expansion of functional capabilities, lower power inputs, higher operational reliability of plant operation.

5 cl, 1 dwg