METHOD FOR START OF REFRIGERATING CIRCUIT CONTAINING MIXTURE OF HYDROCARBONS Russian patent published in 2013 - IPC F25J1/02 

FIELD: heating.

SUBSTANCE: invention relates to the method of starting a unit of natural gas liquefaction, comprising a refrigerating circuit, containing a cooling liquid, which contains a mixture of hydrocarbons, at the same time the method includes serially the following stages: (a) introduction of cleaning gas into the refrigerating circuit and discharge from it; (b) introduction of the first working gas into the refrigerating circuit and (c) introduction of the second working gas into the refrigerating circuit. The average molar mass of the first working gas is more than the average molar mass of the second working gas. The refrigerating circuit comprises a heat exchanger, having a warm input and a cold input, besides, temperature of cooling liquid at the cold input of the heat exchanger reduces at least by 30°C between the start and completion of the stage (b). The invention relates also to the appropriate method of natural gas liquefaction.

EFFECT: using the invention provides for acceleration of start process for facilitation of cooling liquid condensation in a circuit.

13 cl, 3 dwg, 1 tbl