FIELD: oil and gas industry.
SUBSTANCE: gas stream is withdrawn from the main gas pipeline with a pressure relief during an increase in the gas pressure in the main gas pipeline and the gas flow in the gas distribution net to supply the gas to the consumer via the open first main flow regulator, after which the gas is sent to a natural gas partial liquefaction plant. At the same time, the reverse flow formed in the partial liquefaction plant of natural gas is sent through a regulator of the reverse gas flow, where pressure is released, to the gas distribution network to supply the gas to the consumer. When the gas pressure in the main gas pipeline and the gas flow in the gas distribution net for supplying gas to the consumer are being decreased, the first main gas flow regulator is closed and the gas flow from the main gas pipeline is directed through the open second regulator of the main gas stream, with the help of which the main gas flow pressure is reduced to the working pressure of the gas flows mixing to one of the inputs of the gas stream mixer. Then the gas flow is directed to a pressurized compressor device, and then to the inlet of the partial natural gas liquefaction plant. At the same time, the reverse flow formed in the natural gas partial liquefaction plant is directed, on the one side, through the gas return regulator to the gas distribution net to supply the gas to the consumer, and on the other side through the third gas flow regulator for recirculation and compression into the circulation compressor unit with its subsequent supply to another inlet of the gas flow mixer. In the mixer, the compressed circulating gas flow is mixed with the main gas flow and the resulting flow is fed to the suction drum of a pressurized compressor device feeding the gas flow to the inlet of the natural gas partial liquefaction plant.
EFFECT: increasing of the liquefaction rate of the natural gas liquefaction complex and reducing of the dependence of the natural gas liquefaction process on the seasonal unevenness of changes of pressure and main flow gas flowrate from the main gas pipeline to the gas distribution station.
4 cl, 2 dwg
