Natural gas liquefying device and method adopted in extremely-cold region

Abstract

The invention discloses a natural gas liquefying device and method adopted in an extremely-cold region. The device comprises an ethane liquefaction refrigerating system and a methane supercooling refrigerating system. The ethane liquefaction refrigerating system comprises an ethane compressor, an ethane air cooler, an ethane condensate collection tank, a high-pressure ethane evaporator, a medium-pressure ethane evaporator, a low-pressure ethane evaporator and a low-low-pressure ethane evaporator, wherein the ethane compressor, the ethane air cooler, the ethane condensate collection tank, the high-pressure ethane evaporator, the medium-pressure ethane evaporator, the low-pressure ethane evaporator and the low-low-pressure ethane evaporator are connected in sequence. The methane supercoolingrefrigerating system comprises a natural gas supercooler, a methane compressor and a methane air cooler, wherein the natural gas supercooler, the methane compressor and the methane air cooler are connected in sequence. A purified natural gas pipeline from the outside and a methane pipeline from the methane air cooler are each sequentially connected with the high-pressure ethane evaporator, the medium-pressure ethane evaporator, the low-pressure ethane evaporator and the low-low-pressure ethane evaporator. According to the natural gas liquefying device and method, the two-stage stepwise refrigerating mode is adopted. The natural gas liquefying device and method have the traditional stepwise refrigerating technological beneficial effects and further have the beneficial effects that the technological process is simplified; a compressor unit is omitted; operation is conducted more conveniently and more rapidly; and meanwhile, localization of a refrigerant compressor, a heat exchanger andthe like is achieved.

Description

technical field [0001] The invention relates to a natural gas liquefaction device and method in extremely cold regions. Background technique [0002] The Arctic region has more than 47 trillion cubic meters of technically recoverable natural gas reserves to be discovered, accounting for 30% of the world's untapped natural gas reserves. The natural gas there has large reserves, shallow burial depth, almost no hydrogen sulfide, and high gas purity, but nature will not easily hand over these energy treasures to human beings, and the extreme cold is always testing the miners. So far, 3 natural gas liquefaction plants have been built in the extremely cold regions, which are located in Sakhalin, Russia, Hammerfest Island, Norway, and Kinai, Alaska, USA. [0003] Due to the monopoly of foreign natural gas liquefaction technology and key equipment, the construction cost and cycle of large-scale liquefaction plants in my country cannot be effectively controlled. On the other hand, ...

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Problems solved by technology

[0003] Due to the monopoly of foreign natural gas liquefaction technology and key equipment, the constr

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