Natural gas liquefaction system and method and process

1. The present invention relates to a natural gas liquefaction system and method, and belongs to the technical field of natural gas liquefaction.

Background technique:

2. Liquified natural gas (lng for short), as a clean and efficient strategic energy source, is becoming a new hot spot in the world's oil and gas industry. my country's offshore natural gas resources are mainly distributed in the western part of the continental shelf in the northern part of the South China Sea. Offshore floating liquefaction and storage unit (flsu) is considered the best choice for offshore gas field resource development.

3. The deck area of the flsu is 1/4 of the area of the natural gas liquefaction plant on shore, which requires the design of the natural gas liquefaction process to be very compact, and the refrigerant has high adaptability and high thermal efficiency to the natural gas of different origins, so the liquefaction process is required The design is optimized. At present, the natural gas liquefaction process requires multiple gas-liquid separation tanks, occupying a lot of space in the entire process, which is contrary to the concept of compact space on the flsu, and wastes limited space resources and leads to an increase in enterprise operating costs.

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