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Natural gas liquefaction system and method

A technology of natural gas and circulation system, applied in the field of natural gas liquefaction, can solve the problems of increasing operating costs, occupying process space, and wasting limited space resources, etc., and achieves the effect of improving the utilization rate of cold energy, simplifying the process, and improving the value of promotion.

Active Publication Date: 2021-11-12
CNOOC GAS & POWER GRP
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Problems solved by technology

At present, many gas-liquid separation tanks need to be installed in the natural gas liquefaction process, which occupies a large space in the entire process, which is contrary to the concept of compact space on the FLSU, wastes limited space resources and increases the operating cost of the enterprise

Method used

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  • Natural gas liquefaction system and method

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Embodiment Construction

[0031] The experimental methods used in the following examples are conventional methods unless otherwise specified.

[0032] The materials and reagents used in the following examples can be obtained from commercial sources unless otherwise specified.

[0033] Such as figure 1 Shown, be the natural gas liquefaction system of the present invention, structure is as follows:

[0034] The natural gas liquefaction system includes a first liquefaction cold box 2 and a second liquefaction cold box 11, the inlet end of the primary pre-cooling section in the first liquefaction cold box 2 is connected with the natural gas inlet pipeline 1, and the first liquefaction cold box 2 The outlet port of the third-stage precooling section is connected with the inlet port of the first-stage cryogenic section in the second liquefaction cold box 11, and the outlet of the second-stage cryogenic section in the second liquefaction cold box 11 is connected with the sixth throttle valve 15 , connected ...

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Abstract

The invention discloses a natural gas liquefaction system and method. The natural gas liquefaction system comprises a first liquefaction cold box and a second liquefaction cold box; a three-stage pre-cooling section is formed in the first liquefaction cold box through a propane pre-cooling circulating system, so that early-stage pre-cooling of natural gas and a mixed refrigerant is realized; a two-stage cryogenic section is formed in the second liquefaction cold box through a mixed refrigerant circulating system; and the inlet end of the third-stage pre-cooling section is connected with a natural gas inlet pipeline, the outlet end of the third-stage precooling section is connected with the inlet end of the two-stage cryogenic section, the outlet end of the two-stage cryogenic section is connected with a liquefied natural gas outlet pipeline, and a sixth throttling valve is arranged on the liquefied natural gas outlet pipeline. The number of separators in the liquefaction process is simplified, the occupied space of the separators is greatly reduced, free switching among the stages of the three-stage separation tank can be carried out according to local conditions by means of opening and closing of the valves, the production cost of enterprises is reduced while the equipment investment is simplified, and the natural gas liquefaction system has good popularization value on an offshore floating type FLNG (floating liquefied natural gas) platform.

Description

technical field [0001] The invention relates to a natural gas liquefaction system and method, belonging to the technical field of natural gas liquefaction. Background technique [0002] Liquefied Natural Gas (LNG for short), as a clean and efficient strategic energy source, is becoming a new hotspot 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. The offshore floating liquefaction and storage unit (FLSU) is considered to be the best choice for the development of offshore gas field resources. [0003] The deck area of ​​FLSU is 1 / 4 of the area of ​​the onshore natural gas liquefaction plant, 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 natural gas from different origins, so the design of the liquefaction process needs to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25J1/02
CPCF25J1/0217F25J2210/62F25J1/0022F25J1/0052F25J1/0055F25J1/0258F25J1/0278F25J1/0216F25J1/0087F25J1/0292F25J2205/02F25J1/0262
Inventor 范明龙花亦怀苏清博尹全森李秋英
Owner CNOOC GAS & POWER GRP
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