Method and apparatus for liquefying a natural gas stream

A technology of natural gas and gas flow, applied in lighting and heating equipment, liquefaction, refrigeration and liquefaction, etc., can solve the problems of insufficient and complicated recovery of compounds, and achieve the effect of increasing recovery, maintaining the same refrigeration power and increasing production.

Inactive Publication Date: 2008-04-02
SHELL INT RES MAATSCHAPPIJ BV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The problem with the method according to DE 102 26 597 is that it is unnecessarily complicated
Another problem wit

Method used

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  • Method and apparatus for liquefying a natural gas stream

Examples

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Example Embodiment

[0046] For illustrative purposes, a single reference number will be assigned to a pipeline and the logistics carried in the pipeline. The same reference numbers refer to the same components.

[0047] Fig. 1 schematically shows a base load liquefied natural gas (LNG) output program and a device for implementing the output program (indicated by reference numeral 1 as a whole). After the feed stream 10 containing natural gas is expanded in the expander 12, it is supplied to the gas / liquid separator 31 at a specific inlet pressure and inlet temperature. Typically, the pressure of stream 10 will be between 30 bar and 80 bar (preferably >60 bar and <70 bar), and the temperature will be close to ambient temperature, usually between 5°C and 50°C.

[0048] If necessary, the feed stream 10 can be pre-treated before it is fed into the expander 12. For example, the feed stream 10 may be pre-cooled by a coolant in a heat exchanger (not shown), or in a series of heat exchangers, including for e...

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Abstract

The present invention relates to a method of liquefying a natural gas stream, wherein the natural gas stream (10) is provided at a pressure of 30-80 bar, expanded to a pressure < 35 bar, supplied to a gas/liquid separator (31) and therein into a vaporous stream (40) and a liquid stream (30). The pressure of the vaporous stream is increased to a pressure of at least 70 bar and the pressurized vaporous stream (90) is liquefied to obtain a liquefied natural gas stream.

Description

technical field [0001] The present invention relates to a method of liquefying a natural gas stream. Background technique [0002] Several methods of liquefying natural gas streams to obtain liquefied natural gas (LNG) are known. Liquefied natural gas streams are desired for several reasons. As an example, natural gas can be stored and transported over long distances more easily in liquid than in gaseous form because it occupies a smaller volume and does not need to be stored at high pressure. [0003] Examples of known processes for liquefying gases are disclosed eg in US 6 272 882 and DE 10 226 597 A1. [0004] According to Figure 1 of DE 102 26 597 A1, a natural gas stream at a pressure of 70-100 bar is expanded (expander X) to a pressure range of 40-70 bar, cooled (heat exchanger E1) and fed to heavy hydrocarbons (HHC ) tower (T1). The C-rich product removed from the top of the HHC column 2 The fraction is further cooled (E2) and fed to another column (D). The top ...

Claims

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Application Information

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IPC IPC(8): F25J1/02
CPCF25J1/0035F25J2220/64F25J2220/62F25J1/0022F25J1/0214F25J1/0216F25J1/0055F25J2205/02F25J1/0042F25J2230/60F25J1/0238F25J1/02
Inventor C·布伊斯W·达姆E·C·J·N·德容
Owner SHELL INT RES MAATSCHAPPIJ BV
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