Natural gas liquefaction with feed water removal
A natural gas and natural technology, applied in the field of drying and liquefaction of natural gas streams, can solve the problems of feed pressure reducing liquefaction efficiency and other issues
Inactive Publication Date: 2013-10-30
AIR PROD & CHEM INC
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- Application Information
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Problems solved by technology
The disadvantage of this process is that it requires at least one rotating machine (i.e., an isentropic expander) and two heat exchangers (or one heat exchanger with side headers), and the expansion in the isentropic expander The resulting reduced feed pressure reduces liquefaction efficiency
Method used
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[0029] As stated above, in a first aspect of the present invention there is provided a method for drying and liquefying a natural gas stream comprising the steps of: (a) cooling a natural gas feed stream, (b) deriving from the cooled natural gas feed The stream removes water and further cools it, (c) heats the dried, cooled natural gas stream, (d) cools and liquefies the dried, warmed natural gas stream and cools it by convective indirect heat exchange with expanding cold refrigerant at least one compressed refrigerant feed stream, and (e) expanding and thereby further cooling the compressed cold refrigerant stream to provide said expanded cold refrigerant, wherein in step (a) natural gas Cooling of the feed stream and heating of the dried, cooled natural gas in step (c) takes place by indirect heat exchange between said two streams.
[0030] As used herein, the term "expanding" means reducing the pressure of the fluid in question by any suitable means, and in the case of liqu...
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A method and apparatus for drying and liquefying a natural gas stream is described, in which: (a) the water containing natural gas feed stream (10) is cooled (11); (b) the cooled natural gas feed stream (12) is dried (13) and further cooled (15); (c) the dried cooled natural gas stream (16) is heated (11); (d) the dried rewarmed natural gas stream (17) is cooled and liquefied (1) and at least one compressed refrigerant feed stream (3) is cooled by counter-current indirect heat exchange with an expanded cold refrigerant; and (e) the compressed cold refrigerant stream or streams are expanded (38,39), and thereby further cooled, to provide said expanded cold refrigerant; wherein the cooling of the natural gas feed stream in step (a) and heating of the dried cooled natural gas stream in step (c) is by indirect heat exchange (11) between said two streams.
Description
technical field [0001] The present invention relates to methods and apparatus for drying and liquefying natural gas streams. Background technique [0002] Where a natural gas stream contains water, it is necessary to first dry the stream to remove all or substantially all of the water therefrom before liquefaction of the natural gas can proceed. To remove water (and other impurities such as mercury) from natural gas prior to liquefaction, another common practice is to first cool the feedstock below ambient temperature, especially when the ambient temperature is high. [0003] An example of a liquefaction cycle that includes such a pre-cooling step is the propane pre-cooled mixed refrigerant ("C3MR") cycle. In such processes, propane (or a different liquid refrigerant in a vapor compression cycle) can be used to cool the natural gas feedstock to the desired temperature before the drying step takes place. The same liquid refrigerant at a lower pressure may then be used to fu...
Claims
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IPC IPC(8): C10L3/10
CPCF25J2205/60F25J1/0262F25J2220/68F25J1/005F25J2270/90F25J1/0022F25J1/0205F25J1/0204F25J1/0055F25J2205/02F25J1/0212F25J1/0215F25J2220/64F25J1/0072F25J1/0057F25J1/0077F25J3/08F25J5/00
Inventor A.A.布罗斯托G.E.基纳
Owner AIR PROD & CHEM INC