METHOD AND DEVICE FOR LIQUEFYING NATURAL GAS Russian patent published in 2006 - IPC F25J1/00 

FIELD: cryogenic engineering.

SUBSTANCE: method comprises removing admixtures from the gas before expansion and separating the gas flow into three flows. The first flow is cooled in the separating vortex tube and is separated into the cooled and heated gases. The ratio of mass flow rate of the cooled gas at the tube outlet and total gas flow supplied to it is equal to 0.4-0.7. The cooled gas flows through the system of recuperative heat exchangers from the vortex tube, thus cooling in part the gas flow before expansion that is supplied to the liquefying, and the gas is fed to the consumer of reduced gas. The heated gas is throttled, cooled in the heat exchanger, and supplied to the vortex tube as an additional flow. The second flow is supplied for liquefying through the path of the system of recuperative heat exchangers. The ratio of mass flow rates of gas supplied for liquefying to the total flow rate supplied to the vortex tubes is equal to 0.070.22. The gas is throttled, and the condensate is collected in the collecting tank. The third flow is cooled in the vortex tube with additional flow. The cooled gas is throttled, flows through the path of the recuperative heat exchanger thus in part cooling the gas before expansion, is supplied to liquefying, and is fed to the consumer of reduced gas. The heated gas is supplied to the consumer of high-pressure gas.

EFFECT: enhanced efficiency.

2 cl, 1 dwg