FIELD: oil, gas and coke-chemical industries.
SUBSTANCE: invention relates to production of liquefied natural gas (LNG) at gas-distributing station (GDS) of main gas pipeline. Direct flow of natural gas of high pressure is divided into process and production streams, expanding process flow of gas and returning it by return flow with cooling of production gas flow. Production gas flow is throttled after its cooling, vapour-liquid mixture is divided into steam and liquid phases with further direction into reverse flow of uncondensed natural gas. Inverse flow is compressed, cooled and returned to cycle. Additional natural gas flow is extracted from the main pipeline, dried in the unit, cleaned in the cleaning unit and divided into two flows. First one is connected with the direct flow before separation into process and production flows, and the second one is cooled, expanded in the expander and connected to the return flow before its heating. Part of the stream is heated by means of a gas heater and directed for regeneration of adsorbent drying and cleaning. Portion of the back flow of gas ahead of the compressor is directed to provide operation of the gas heaters.
EFFECT: technical result of invention is increase of energy efficiency of process of liquefied natural gas production on GDS.
1 cl, 1 dwg
