FIELD: gas industry.
SUBSTANCE: invention relates to the gas industry. The natural gas liquefaction, storage and offloading complex includes: natural gas separation and measurement unit 101, natural gas purification unit from mercury and methanol 102, natural gas purification unit from acidic impurities, hydrogen sulfide and carbon dioxide 103, natural gas drying unit 104, purification unit natural gas from heavy hydrocarbons C5 and above 105, natural gas liquefaction link 106, storage and compounding link of refrigerant components 107, refrigerant compression link 108, LNG storage link 109, LNG shipment link 110, boil-off gas compression link 111. The complex is supplemented with links 201-208, which fully corresponds to links 101-108. The complex includes: LNG degassing section 209, which includes a degassing tank for depressurizing LNG, bringing the LNG temperature to the required level and removing excess boil-off gases, as well as pumps for supplying LNG to the LNG storage section 109, boil-off gas compression link 210, providing for the return of boil-off gas from the LNG degassing link 209 to the natural gas liquefaction link 206 due to its three-stage compression: at the first stage in the compressor from atmospheric pressure to 1.0-1.5 MPa, at the second stage - up to 2.0-3.0 MPa, at the third stage - up to 6.0-8.0 MPa, after which part of the boil-off gas is sent for mixing with natural gas purified from acidic impurities from the natural gas purification unit from acidic impurities 203, and the other part of the boil-off gas is used as fuel for the complex's own needs to prevent the accumulation of nitrogen and other impurities in the natural gas liquefaction 206 and LNG storage 109 units.
EFFECT: synchronization of the performance of the complex and the LNG injection system into gas carriers.
6 cl, 1 dwg
