FIELD: natural gas liquefaction.
SUBSTANCE: method for liquefying a purified and dried natural gas stream. Natural gas is cooled by heat exchange with mixed coolants in a cascade of three mixed coolant circuits. In the first heat exchanger of the first, second and third mixed coolant circuits, natural gas is pre-cooled, in the second heat exchanger of the second and third mixed coolant circuits, natural gas is liquefied, and in the third heat exchanger of the third mixed coolant circuit, natural gas is supercooled. When the ambient temperature changes, the composition of the mixed coolant in each circuit is regulated by directing part of the flow of the mixed coolant into the evaporation tank with a decrease in pressure to a value at which the formation of liquid and vapor phases occurs in the evaporation tank. After that, one of the phases, selected from the condition of the required change in the composition of the mixed coolant, is returned to the corresponding circuit, for which it is sent with a decrease in pressure to the evaporation space of the corresponding heat exchanger, connected to the inlet of the indicated compressor of the corresponding circuit. When the ambient air temperature changes downward, the vapor phase is selected to be returned to the circuit, and when the ambient air temperature changes upward, the liquid phase is selected to be returned to the circuit.
EFFECT: ensuring a rapid change in the composition of the mixed coolants of all circuits and the total amount of coolants in the circuits with a rapid change in ambient temperature.
8 cl, 2 dwg, 5 tbl
Title | Year | Author | Number |
---|---|---|---|
METHOD FOR LIQUEFYING NATURAL GAS ON SINGLE MIXED REFRIGERANT "SUNRISE ENERGY" AND INSTALLATION FOR ITS IMPLEMENTATION | 2023 |
|
RU2803441C1 |
CONTAINER UNIT OF NATURAL GAS LIQUEFACTION AND METHOD FOR PRODUCING LNS USING THIS UNIT | 2018 |
|
RU2767239C2 |
METHOD FOR LIQUEFYING HYDROCARBON RAW FLOW AND SYSTEM FOR ITS IMPLEMENTATION | 2017 |
|
RU2749626C2 |
METHOD FOR NATURAL GAS LIQUEFACTION | 2022 |
|
RU2803363C1 |
METHOD OF NATURAL GAS LIQUEFACTION AND DEVICE FOR ITS IMPLEMENTATION | 2013 |
|
RU2538192C1 |
COMPLEX SYSTEM FOR METHANE COOLING FOR NATURAL GAS LIQUEFACTION | 2016 |
|
RU2752223C2 |
METHOD FOR LIQUEFYING NATURAL GAS | 2022 |
|
RU2795716C1 |
COMPLEX FOR PROCESSING MAIN NATURAL GAS INTO MARKETABLE PRODUCTS | 2020 |
|
RU2744415C1 |
INSTALLATION AND METHOD OF LIQUEFYING NATURAL GAS | 2018 |
|
RU2684232C1 |
NATURAL GAS LIQUEFACTION METHOD “ARCTIC MIX” | 2023 |
|
RU2797608C1 |
Authors
Dates
2023-09-12—Published
2023-06-01—Filed