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System And Method For Natural Gas Liquefaction

  • US 20150204603A1
  • Filed: 09/07/2012
  • Published: 07/23/2015
  • Est. Priority Date: 09/07/2012
  • Status: Abandoned Application
First Claim
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1. A liquefied natural gas (LNG) production system, comprising:

  • a main cryogenic heat exchanger;

    a natural gas liquefaction subsystem; and

    a refrigeration subsystem comprising a plurality of refrigerant compressors configured into a series arrangement to perform multi-stage compressions of a refrigerant, a plurality of aftercoolers each of which being coupled to each of the plurality of refrigerant compressors to cool the compressed refrigerant, a plurality of turboexpanders coupled to the last aftercooler and configured into a series configuration to perform multi-stage expansions of the compressed refrigerant, and a plurality of refrigerant heat exchange means coupled to both the first of the plurality of refrigerant compressors and the last of the plurality of turboexpanders, so that all components form a close refrigeration cycle;

    wherein the main cryogenic heat exchanger facilitates heat exchange between a pressurized natural gas passing through the natural gas liquefaction subsystem and a refrigerant passing through the refrigeration subsystem so that the pressurized natural gas in the natural gas liquefaction subsystem is liquefied by the refrigerant in the refrigeration subsystem.

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