FIELD: technological processes.
SUBSTANCE: invention relates to low-temperature dephlegmation units with rectification LTDR and can be used in gas industry for field preparation of natural gas. Disclosed group of inventions includes versions of plants LTDR for integrated non-waste field gas treatment. At that, plant LTDR for integrated non-waste field gas treatment includes an inlet separator, first and second recuperative heat exchangers, a refluxer with a heat exchange section, equipped with a dephlegmation gas supply line with a reducing device, separator equipped with a prepared gas discharge line, as well as a fractionation unit and reducing devices, wherein as a separator a demethanizer is installed, which is equipped with a demethanized condensate supply line to the fractionation unit and the treated gas outlet line with the refluxing heat exchange section and the first recuperative heat exchanger, furthermore, the demethanizer is connected to the inlet separator, the first and second intermediate separators and the dephlegmator by the condensate supply lines with the reduction devices, and with second recovery heat exchanger – circulation irrigation input / output lines, at that between the recuperative heat exchangers and the dephlegmator there installed are the first and the second intermediate separators with a reducing device between them, fractionation unit is equipped with product discharge lines and connected to demethanizer by off-gas feed line, and dephlegmation gas supply line is connected to prepared gas discharge line.
EFFECT: technical result is higher output of hydrocarbons C3+.
2 cl, 2 dwg
