FIELD: oil and gas industry.
SUBSTANCE: method of production of liquefied natural gas and compressed natural gas at a gas distribution station (GDS), a non-volatile one, which simultaneously produces liquefied and compressed natural gas. Natural gas is taken from the main gas pipeline, divided into two streams: the first stream is directed to the liquefaction of natural gas and, at the same time, the second stream is directed to natural gas compression. The second stream is passed alternately through a second compressor and an air-cooling unit. Concurrently, the first liquefaction stream is filtered, purified in an adsorber, cooled in at least one heat exchanger and divided into two streams: process and production. The process flow is directed to the expander, with the generator of which the electrical connection of the first compressor engines is established, which is used when the production flow of the incoming first gas stream is liquefied, and the second compressor, which is used to compress the incoming second gas stream, as well as the fans of the air-cooling unit. The production stream is passed through the first compressor, cooled in an air-cooling unit, then it is additionally cooled in at least one heat exchanger and passed through a choke to produce a vapor-liquid mixture. Liquid phase is separated from it and, completing the production flow, directs it for download to the consumer of liquefied natural gas. Reverse flow is formed from the vapor phase, directed through the heat exchangers of the production stream, connecting with the expanded and low-temperature process stream leaving the expander. The complex for implementing the method includes two lines. The first natural gas supply line contains a filtration unit, an adsorber, a heat exchanger and is divided into a process, production and return line. The production line comprises a first compressor, an air-cooling unit, and at least one heat exchanger, a choke, a separator and is connected to a liquefied natural gas storage. The return line originates in the separator, passes through the heat exchangers of the production line and is connected at the outlet to the gas transmission grid. The process line contains an expander and is connected to the return line, at the same time the second natural gas supply line comprises a second compressor, an air-cooling unit and is connected to the consumers of compressed natural gas, and the expander generator is connected through electrical communication with the motors of the first and second compressors, as well as with fans of air cooling units.
EFFECT: increase of productivity at reduction of energy consumption.
7 cl, 4 dwg
