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Method for liquefaction of a stream rich in hydrocarbons

A hydrocarbon and refrigerant technology, applied in liquefaction, refrigeration and liquefaction, solidification and other directions, can solve problems such as troublesome compressor work, large equipment costs, etc., and achieve the effect of reducing energy consumption, simple control, and reducing temperature difference

Inactive Publication Date: 2008-05-28
LINDE AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, so-called cold-suction compressors have the disadvantage that during operation, especially during start-up and stop, they are troublesomely operated as non-cold-suction compressors.
Furthermore, the liquefaction method described in US-A-6,347,531 has the disadvantage that the refrigerant is partially liquefied at intermediate pressure, which leads to greater equipment costs

Method used

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  • Method for liquefaction of a stream rich in hydrocarbons

Examples

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Embodiment Construction

[0025] Below with the help of figure 1 The examples shown illustrate in more detail the method according to the invention as well as other embodiments.

[0026] According to the method shown in the figure, a dry pretreated hydrocarbon-rich stream, such as natural gas, is fed via line X to the liquefaction process according to the invention and liquefied and optionally subcooled in heat exchanger E . The pressure of the hydrocarbon-rich stream is, for example, from 10 to 60 bar. The liquefied and optionally subcooled hydrocarbon-rich stream is then sent to other uses via conduit X'. The optional separation of undesired components, such as higher hydrocarbons, is not shown. In this regard reference is made to the corresponding embodiments of the above-mentioned German patent DE-A-102 09 799 .

[0027] According to the invention the hydrocarbon-rich stream X, X' is cooled and liquefied in heat exchange against the flow of a refrigerant mixture of three or more components, whe...

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Abstract

The invention relates to a method for liquefaction of a stream rich in hydrocarbons, whereby the liquefaction of the stream (X,X' ) rich in hydrocarbons is carried out in heat exchange (E) with a three- or multi-component refrigerant mixture, the compression of the refrigerant mixture stream (4,7) is carried out by means of an at least two-stage compression (Cl,C2), before the cooling (E) and the refrigerating expansion (a,b,c) of the refrigerant mixture, a separation (D) of the refrigerant mixture into a higher boiling (5) and a lower boiling refrigerant fraction (2) is carried out and the higher boiling (5) and the lower boiling refrigerant fraction (2) are introduced (4,7) to the compression (Cl,C2) after the refrigerating expansion (a,b,c) at the warm end of the heat exchanger (E).

Description

technical field [0001] The present invention relates to a process for liquefying hydrocarbon-rich streams, particularly natural gas streams. Background technique [0002] The natural gas liquefaction plant is configured as a so-called LNG-Baseload plant, which is a plant for liquefying natural gas to supply natural gas as primary energy, or as a so-called PeakShaving plant, which is a plant for liquefying natural gas to meet peak demand . [0003] Larger LNG plants typically operate with refrigeration circuits consisting of hydrocarbon mixtures. These mixture circuits are energy efficient as expander circuits and can achieve relatively low specific energy consumption. [0004] German patent DE-A-102 09 799 discloses a method for liquefying a hydrocarbon-rich stream, in particular a natural gas stream, according to which the enrichment is carried out in the heat exchange against the two-component refrigerant mixture stream. Liquefaction of hydrocarbon-containing streams; h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25J1/02
CPCF25J1/0092F25J1/0055F25J1/0212F25J1/0022
Inventor H·施密特
Owner LINDE AG