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Configurations and methods of heating value control in LNG liquefaction plant

  • US 8,635,885 B2
  • Filed: 10/12/2011
  • Issued: 01/28/2014
  • Est. Priority Date: 10/15/2010
  • Status: Active Grant
First Claim
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1. A method of recovering NGL from a natural gas comprising:

  • cooling and separating an overhead product of a scrub column to produce a C5+ depleted vapor fraction and a first reflux for the scrub column;

    cooling and separating a first portion of the C5+ depleted vapor fraction to produce a second reflux for the scrub column and a C3+ depleted vapor stream.expanding the C3+ depleted vapor stream in an expansion device to generate refrigeration for the first portion of the C5+ depleted vapor fraction;

    compressing and combining the expanded C3+ depleted vapor stream with a second portion of the C5+ depleted vapor fraction to thereby form a liquefaction feed stream; and

    using a ratio between the first and second portions of the C5+ depleted vapor fraction and/or a discharge pressure of the expansion device to control C3 recovery in a bottom product of the scrub column.

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