INSTALLATION FOR GAS REDUCTION AND PRODUCTION OF CONSTANT AMOUNT OF LNG Russian patent published in 2021 - IPC F25J1/00 

FIELD: gas industry.

SUBSTANCE: invention relates to cryogenic technology and can be used to liquefy natural gas at gas distribution stations. The invention relates to an installation for reducing gas and generating a constant amount of liquefied natural gas (LNG), including gas drying and purification units, preliminary and main heat exchangers, a separator, as well as expanders and a compressor connected to each other. As a compressor, a cooling machine compressor is installed with the possibility of supplying energy from the side, the high-pressure dried natural gas line is divided into at least one auxiliary gas line, the main and auxiliary process gas lines and the production gas line, in which the first section of the pre-heat exchanger, the cleaning unit, the second section of the pre-heat exchanger, the main heat exchanger, the first expander and the separator, equipped with an LNG output line and a return gas line with the main heat exchanger, are sequentially located. In the main process gas line, the first evaporator of the refrigerating machine, the second expander and connections to the return gas line and to the auxiliary process gas line equipped with an auxiliary refrigerator and a third expander are located, and in the low-pressure gas line formed by these lines, a preliminary heat exchanger is located. The auxiliary refrigerator is also located in at least one auxiliary gas line equipped with an auxiliary expander and a second evaporator of the refrigeration machine, in addition, the low-pressure gas line is connected to the main process gas line in front of the first evaporator by a circulation gas line in which the circulation compressor and refrigerator are installed.

EFFECT: invention is aimed at increasing the LNG output and the possibility of gas extraction by several consumers at different pressures and ensuring the consistency of the LNG output.

1 cl, 1 dwg