Integrated Nitrogen Removal in the Production of Liquefied Natural Gas Using Intermediate Feed Gas Separation

Integrated Nitrogen Removal in the Production of Liquefied Natural Gas Using Intermediate Feed Gas Separation

  • CN 105,043,011 A
  • Filed: 04/24/2015
  • Published: 11/11/2015
  • Est. Priority Date: 04/24/2014
  • Status: Active Application
First Claim
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1. , for generation of a method for denitrogenation liquefied natural gas product, described method comprises:

  • A natural gas feed stream is incorporated in the warm end of main heat exchanger by (), make described natural gas feed stream cool and liquefy at least in part, and extracts out through cooling and the stream liquefied at least in part from the centre position of described main heat exchanger;

    B () makes described through cooling and the stream expansion of liquefying at least in part, partly evaporate and be separated, to form rich nitrogen natural gas vapor stream and denitrogenation natural gas liquids stream;

    C described steam and liquid stream are incorporated in the centre position of described main heat exchanger by () dividually again, cool described steam and liquid stream concurrently further, described liquid stream cools further, to form the first liquefied natural gas stream, and described steam stream cools further and liquefies at least in part, to form the first rich nitrogen natural gas flow liquefied at least in part, and from the rich nitrogen natural gas flow that cold junction extraction described first liquefied natural gas stream and described first of described main heat exchanger liquefies at least in part;

    D rich nitrogen natural gas flow that () makes described first to liquefy at least in part expands, partly evaporates and be separated, to form nitrogen rich vapor product and the second liquefied natural gas stream;

    AndE () makes described second liquefied natural gas stream expand, partly evaporate and be separated, to form denitrogenation liquefied natural gas product and rich nitrogen natural gas vapor.

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