Method for refrigerating liquefied gas and installation therefor

A technology of liquefied natural gas and cooling method, which is applied in liquefaction, refrigeration and liquefaction, lighting and heating equipment, etc., can solve the problems of increasing production and achieve the effect of increasing production

Inactive Publication Date: 2006-07-26
TECH FRANCE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In fact, when an LNG production unit is operating at its maximum capacity, there is no way to increase, even temporarily, its production without resorting to heavy and expensive investments in building another production unit

Method used

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  • Method for refrigerating liquefied gas and installation therefor
  • Method for refrigerating liquefied gas and installation therefor
  • Method for refrigerating liquefied gas and installation therefor

Examples

Experimental program
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Embodiment Construction

[0031] Some symbols can be seen in these 7 diagrams: "FC" stands for "Flow Controller", "GT" stands for "Gas Turbine", "GE" stands for "Generator", "LC" stands for "Liquid Level Controller" , "PC" stands for "Pressure Controller", "SC" stands for "Speed ​​Controller", "TC" stands for "Temperature Controller".

[0032] For the sake of clarity and conciseness, the pipes used in the apparatus of Figures 1-7 are indicated by the same reference symbols as the gas fractions flowing therein.

[0033] Referring to Figure 1, the apparatus shown is used in known manner to process a dry natural gas 100 free of sulfur and carbon to obtain a liquefied natural gas 1 at a temperature generally below -120°C.

[0034] The GNL liquefaction plant has two separate cooling circuits. The first cooling circuit 101 corresponds to a propane circuit, and a primary cooling of approximately -30° C. can be obtained by expansion and vaporization of liquid propane in an exchanger E3. The heated and expand...

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PUM

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Abstract

The invention concerns a method for refrigerating liquefied natural gas under pressure (1), comprising a first step wherein the LNG (1) is cooled, expanded and separated (a) in a first base fraction (4) which is collected, and (b) a first top fraction (3) which is heated, compressed in a compressor (K1) and cooled into a first compressed fraction (5) which is collected; a second compressed fraction (6) is drawn from the fuel gas (5), cooled then mixed with the cooled and expanded LNG (1). The invention is characterised in that it comprises a second step wherein the second compressed fraction (6) is compressed and cooled, and a flux is (8) drawn and cooled, expanded and introduced in the compressor (K1). The invention also describes other embodiments.

Description

technical field [0001] A first aspect of the present invention relates generally to the gas industry, and in particular to a process for refrigeration of gases under pressure containing methane and C2 and higher hydrocarbons for their separation. [0002] More specifically, the first aspect of the invention relates to a process for refrigeration of pressurized liquefied natural gas containing methane and C2 and higher hydrocarbons, the process comprising a first stage (I) in which: (Ia ) expanding said pressurized liquefied natural gas to provide an expanded liquefied natural gas stream; (1b) separating said expanded liquefied natural gas into a more volatile first overhead fraction and a less volatile second overhead fraction; a bottoms fraction; (Ic) a first bottoms fraction consisting of cooled liquefied natural gas is collected; (Id) a first overhead fraction is heated and compressed in a first compressor and cooled to provide a first compression of the combustible gas an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F25J1/02F25J1/00C10L3/06C10L3/10F25J3/02F25J3/06
CPCF25J2240/30F25J2200/04F25J3/0209F25J3/0635F25J2290/80F25J2200/70F25J3/0257F25J1/004F25J2270/12F25J1/0037F25J2200/02F25J2270/42F25J1/0285F25J2220/62F25J2270/04F25J1/0219F25J1/0052F25J1/0274F25J2270/60F25J3/066F25J1/0022F25J3/061F25J1/0055F25J1/0087F25J1/0042F25J2245/02F25J3/0233F25J2280/02F25J1/0288F25J2270/18F25J1/0283F25J2215/04F25J2270/66F25J2205/04F25J2240/40F25J1/02F25J3/08
Inventor 亨利·帕拉道斯基
Owner TECH FRANCE SA
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