FIELD: oil and gas industry.
SUBSTANCE: invention relates to cryogenic engineering and can be used in gas industry for liquefaction of natural gas. Natural gas liquefaction method involving preliminary cooling and cleaning from oil and condensed moisture, adsorption drying and removal of carbon dioxide liquid hydrocarbons obtained by compression of mixture of natural gas and process gas flow, cooling to complete condensation, cleaning of solid impurities by filtration and separation into process flow. It is used for cooling and preliminary cooling of compressed gas and then taken for mixing with natural gas. Product flow, which is reduced and separated to liquefied natural gas supplied as product and separation gas, which is cooled liquid hydrocarbons released during gas compression, and then used as fuel gas for compressor drive. Dehydration is carried out after its cooling by additional coolant, process flow of gas and fuel gas to temperature close to temperature of hydrate formation, but exceeds it, cleaning of liquid hydrocarbons from carbon dioxide is carried out after its preliminary cooling process flow of gas and fuel gas to temperature close to temperature dew point at carbon dioxide gas, but exceeds it. Purified liquid hydrocarbons released during gas compression is divided into process and product flows and separate cooling and reduction, besides, gas recovery of drying and cleaning of liquid hydrocarbons from carbon dioxide gas is mixed with gas separation.
EFFECT: high output of liquefied natural gas.
4 cl, 1 dwg
