METHOD FOR CONTROLLING LIQUEFACTION OF NATURAL GAS Russian patent published in 2018 - IPC F25J1/00 

FIELD: machine engineering.

SUBSTANCE: invention relates to methods for controlling liquefaction of natural gas (LNG), and can be used for liquefaction and supercooling of natural gas. Method of controlling liquefaction of natural gas by means of a plant operating on mixed refrigerant consists in periodical measurement of actual parameters of said process and controlling the composition of refrigerant fed to the main cryogenic heat exchanger in order to achieve optimal process parameters. The Carnot factor is used as a criterion for optimal process parameters. The composition of refrigerant is controlled by direct calculation based on actual process parameters and equations of state of substance components quantity of mixed refrigerant (for example, equations of state of Penga-Robinson) necessary to achieve temperature profile in the main cryogenic heat exchanger corresponding to the optimal parameters of the process and introducing said components in calculated quantity in the main cryogenic heat exchanger.

EFFECT: invention makes it possible to increase efficiency of natural gas liquefaction cycle and thereby minimize the specific power of the compressor required for production of liquefied natural gas.

2 cl, 2 dwg