FIELD: methods for reconstruction of devices for low-temperature separation of natural gas.
SUBSTANCE: invention relates to methods for reconstruction operating devices for low-temperature separation of natural gas and can be used in the gas industry. The invention relates to a method for the reconstruction of a low-temperature gas separation unit, including an inlet separator, a recuperation unit, a low-temperature separation unit with a low-temperature separator and a fractionation unit, to increase the output of gas condensate, which consists in installing between a fractionation unit equipped with an exhaust gas outlet and product output lines, and a low-temperature separation unit containing a reducing device and a low-temperature separator, a demethanizer equipped with a methane-containing gas outlet line and equipped with a heater connected to the inlet separation gas line before and after the recuperation unit. An expander is placed as a reducing device, in front of which an intermediate separator is installed, the low-temperature and intermediate separators are connected to the demethanizer by feed lines of hydrocarbon condensates with reducing devices. The top of the demethanizer is connected to the off-gas outlet line by a methane-containing gas supply line, and the bottom of the demethanizer is connected to the fractionation unit by a demethanized condensate supply line. The inlet separation gas line before the recuperation unit is divided into three lines: the line for supplying part of the inlet separation gas to the heater, the line for supplying part of the inlet separation gas to the recuperation unit and the process gas line, on which the “process gas/part of the low-temperature separation gas” heat exchanger and compressor are installed. connected to the expander, and as products get a propane-butane fraction and gas condensate. The invention also relates to an option of the method for the reconstruction of a low-temperature gas separation unit.
EFFECT: increase in the yield of gas condensate during the preparation of natural gas at pressures above and below critical.
2 cl, 4 ex, 3 dwg
