LNG facility with integrated NGL recovery for enhanced liquid recovery and product flexibility

Patent metadata

Field	Value
Publication number	US-9841231-B2
Application number	US-201113282936-A
Country	US
Kind code	B2
Filing date	Oct 27, 2011
Priority date	Jul 12, 2005
Publication date	Dec 12, 2017
Grant date	Dec 12, 2017

Abstract

Process for efficiently operating a natural gas liquefaction system with integrated heavies removal/natural gas liquids recovery to produce liquefied natural gas (LNG) and/or natural gas liquids (NGL) products with varying characteristics, such as, for example higher heating value (HHV) and/or propane content. Resulting LNG and/or NGL products are capable of meeting the significantly different specifications of two or more markets.

First claim

What is claimed is:

1. A natural gas handling facility comprising:
a first distillation column comprising a first fluid inlet, a first vapor outlet, and a first liquid outlet;
a first heat exchanger defining a first heating pass and a first cooling pass, wherein said first heating pass defines a first cool fluid inlet and a first warm fluid outlet, wherein said first cooling pass defines a first warm fluid inlet and a first cool fluid outlet, wherein said first cool fluid inlet of said first heating pass is in fluid flow communication with said first liquid outlet of said first distillation column;
a second heat exchanger defining a second heating pass and a second cooling pass, wherein said second heating pass defines a second cool fluid inlet and a second warm fluid outlet, wherein said second cooling pass defines a second warm fluid inlet and a second cool fluid outlet, wherein said first warm fluid outlet of said first heating pass is in fluid flow communication with said second cool fluid inlet of said second heating pass;
an intermediate stage flash drum comprising a third fluid inlet, a third vapor outlet, and a third liquid outlet, wherein said third fluid inlet is in fluid flow communication with said first liquid outlet of said first distillation column;
a second distillation column comprising a second fluid inlet, a second vapor outlet, and a second liquid outlet, wherein said second fluid inlet of said second distillation column is in fluid flow communication with a composite stream formed from said second warm fluid outlet of said second heating pass and said third liquid outlet of said intermediate stage flash drum,
wherein said second vapor outlet of said second distillation column is in fluid flow communication with said second warm fluid inlet of said second cooling pass, and
wherein said first warm fluid outlet of said first heating pass is not in fluid flow communication with said first distillation column.

2. The facility of claim 1 , further comprising an upstream refrigeration cycle defining a warm natural gas inlet and a cool natural gas outlet, wherein said cool natural gas outlet is in fluid flow communication with said first fluid inlet of said first distillation column.

3. The facility of claim 2 , wherein said upstream refrigeration cycle comprises a propane, propylene, ethane, or ethane refrigeration cycle.

Assignees

• Qualls Wesley
• Ransbarger Weldon L
• Huang Shawn S
• Yao Jame
• Elliot Doug
• Chen Jong Juh
• Lee Rong-Jwyn
• Conocophillips Co

Inventors

• Qualls Wesley
• Ransbarger Weldon L
• Huang Shawn S
• Yao Jame
• Elliot Doug
• Chen Jong Juh
• Lee Rong-Jwyn

Classifications

• F25J1/0052

  by vaporising a liquid refrigerant stream · CPC title

• F25J3/0247

  separation of CnHm with 4 carbon atoms or more · CPC title

• F25J2205/04

  in the feed line, i.e. upstream of the fractionation step · CPC title

• F25J1/0045

  by vaporising a liquid return stream · CPC title

• F25J1/004

  by flash gas recovery (F25J1/0267 takes precedence) · CPC title