METHOD FOR LIQUEFYING A FRACTION SATURATED WITH HYDROCARBONS Russian patent published in 2021 - IPC F25J1/00 

FIELD: gas industry.

SUBSTANCE: method for liquefying stream saturated with hydrocarbons, in particular natural gas stream, is proposed. The liquefaction of stream saturated with hydrocarbons is carried out in counterflow with cascade of circuits of a mixture of refrigerating agents, consisting of three circuits of a mixture of refrigerating agents. In each of three circuits of a mixture of refrigerating agents, the mixture of refrigerating agents to be compressed is divided into two corresponding partial streams (1, 1', 10, 10', 20, 20') of the mixture of refrigerating agents. Compression of partial streams of the mixture of refrigerating agents is carried out using four lines (GT-C1A-C2A, GT-C1B-C2B, GT-C3A-C3A', GT-C3B-C3B') of essentially equal power. Compression of partial streams of the mixture (1, 1', 10, 10') of refrigerating agents from the first and from the second circuits of the mixture of refrigerating agents (1, 1', 10, 10') is carried out in each case separately on two lines (GT-C1A-C2A, GT-C1B-C2B). Compression of partial streams of the mixture (20, 20') of refrigerating agents from the third circuit of the mixture of refrigerating agents is carried out in each case separately on two other lines (GT-C3A-C3A', GT-C3B-C3B').

EFFECT: ensuring the continuous operation of the liquefaction process in terms of loading.

1 cl, 2 dwg