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Pre-cooled liquefaction process of natural gas

A pre-cooling and coolant technology, applied in refrigeration and liquefaction, liquefaction, chemical instruments and methods, etc., can solve problems such as platform melting and danger

Inactive Publication Date: 2010-11-10
AIR PROD & CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The accident resulted in the death of 167 people and the melting of the platform
[0010] Therefore, the use of propane as a refrigerant can be extremely dangerous, especially since propane inventories are required not only in the pre-cooling section, but also in storage and in the depropanization column used to extract propane

Method used

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  • Pre-cooled liquefaction process of natural gas
  • Pre-cooled liquefaction process of natural gas
  • Pre-cooled liquefaction process of natural gas

Examples

Experimental program
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Embodiment

[0090] In this illustrative illustration, a dehydrated natural gas feed stream 100 is liquefied to form LNG using a HFC pre-cooled mixed refrigerant process. The total dehydrated natural gas feed stream 100 into the pre-cooling section is about 2.39 mmtpa or 301.2 tph. from the desiccant bed ( figure 1 ) dehydrated natural gas feed stream 100 enters HFC-cooled evaporator 222 at 15°C and 68.95 bar (absolute pressure), where it is cooled to a temperature of -4.06°C. This feed is further cooled in evaporator 226 to a temperature of approximately -24.39° C., after which it is sent as stream 102 to scrubber 103 . The cold reflux stream 111 in the scrubber 103 strips C3+ (propane, butane, pentane, etc.) hydrocarbons from the input stream 102 to produce a vapor upper stream 104 and a bottom heavy hydrocarbon stream 105 .

[0091] Table 4 summarizes the different fluid conditions exemplified:

[0092] Table 4

[0093]

[0094]

[0095] The heavy hydrocarbon stream 105 is t...

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Abstract

A system and method for liquefying a natural gas stream, the method including the steps of providing a dehydrated natural gas stream for liquefaction, pre-cooling the dehydrated natural gas stream in a pre-cooling apparatus, wherein, the pre-cooling is performed by using a pre-coolant (162) that consists essentially of a hydrofluorocarbon (HFC) refrigerant, and further cooling the pre-cooled dehydrated natural gas stream in a main heat exchanger through indirect heat exchange against a vaporized hydrocarbon mixed refrigerant coolant to produce a liquefied natural gas product stream, wherein, the mixed refrigerant coolant comprises ethane, methane, nitrogen, and, preferably, less than or equal to 3 mol % of propane.

Description

technical field [0001] The present invention relates to a system and method for liquefying a natural gas stream. Background technique [0002] Existing pre-cooled natural gas liquefaction methods have been disclosed for use on floating production storage and offloading (FPSO) platforms using CO 2 to pre-cool a natural gas feed stream, while using a hybrid refrigerant hydrocarbon mixture (HMR) to further cool the pre-cooled stream to provide a liquefied natural gas (LNG) product. In these processes, a natural gas feed stream is treated with boiling CO at one or more pressure levels 2 Allow to pre-cool. CO 2 vaporization while precooling the natural gas feed stream to a temperature of approximately -35°C. The CO 2 The vapor is then compressed, cooled and condensed to form liquid CO 2 Refrigerant for recycling back into the process. [0003] However, using CO 2 Liquefying LNG on an FPSO as a pre-coolant has several disadvantages. First, CO 2 Its freezing point is -56....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L3/10F25B31/02
CPCF25J1/0256F25J1/0241F25J1/0216F25J1/0052F25B9/006F25J1/0292F25J1/0298F25J1/0284F25J2220/64F25J1/025F25J1/0214F25J1/0087F25J1/0283F25J2290/02F25J1/0097F25J1/0055C09K5/041F25J1/0215F25J1/0278F25J1/0238F25J1/0092F25J2280/10F25J1/0022F25J1/004F25J1/021
Inventor M·J·罗伯茨V·A·瓦马
Owner AIR PROD & CHEM INC