Configurations and methods of heating value control in LNG liquefaction plant
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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Abstract
NGL recovery from natural gas is achieved by processing the natural gas in a scrub column that operates at high pressure. A C3+ depleted vapor stream is generated from the vapor portion of partially condensed scrub column overhead and expanded to provide refrigeration for the vapor portion to so form a second reflux stream and the C3+ depleted vapor stream. The C3+ depleted vapor stream is then combined with another vapor portion of partially condensed column overhead to produce a lean liquefaction feed stream.
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Citations
8 Claims
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1. A method of recovering NGL from a natural gas comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification