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Methods and configuration of boil-off gas handling in LNG regasification terminals

一种燃气、再液化的技术，应用在容器排放的方法、气体处理/储存目的、流体处理等方向

Inactive Publication Date: 2011-06-01
FLUOR TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Therefore, although various methods of controlling the calorific value of LNG are known in the technical field, all or almost all of them are plagued by more or less disadvantages, especially in the case of using imported LNG, in the case of NGL In the absence of a market, and in situations where the Wobbe Index for imported LNG is only just barely meeting local norms

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  • Methods and configuration of boil-off gas handling in LNG regasification terminals
  • Methods and configuration of boil-off gas handling in LNG regasification terminals
  • Methods and configuration of boil-off gas handling in LNG regasification terminals

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[0019] The inventors have found that, for situations where at least partially vaporized vapor is reliquefied during storage and at least partially condensed within the feed LNG, changes in the Wobbe Index due to aging in LNG storage tanks can be reduced and typically In some cases the change can be prevented entirely. Further flexibility is provided by routing at least another portion of the steam to a fuel manifold or other device utilizing lean natural gas.

[0020] For example in a particularly preferred method, control of the Wobbe index of the LNG in the LNG storage tank (which is coupled to the regasification unit) can be achieved by means of a compression unit which compresses the cold boil-off gas from the tank, and The first stream of compressed boil-off gas is heat exchanged with cold boil-off gas or LNG to form cooled compressed boil-off gas. A portion of the cooled compressed boil-off gas is then mixed with LNG while another portion of the cooled compressed boil-o...

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Abstract

A LNG storage and regasification plant includes a reliquefaction unit in which boil-off vapors from the storage tanks are re liquefied and recycled back to the LNG storage tanks for tank pressure and Wobbe index control. Preferably, LNG cold is used for reliquefaction and operational flexibility is achieved by feeding a portion of the pressurized boil-off gas to a fuel gas header and / or to be recondensed by the sendout LNG.

Description

[0001] This application claims priority to our US Provisional Patent Application (Serial No. 61 / 044302) filed April 11, 2008, which is hereby incorporated by reference into this application. field of invention [0002] The field of the invention is natural gas processing, in particular as it relates to the treatment of boil-off gas in LNG regasification terminals and the control of the Wobbe index. Background technique [0003] US pipeline gas is generally very lean, with a calorific value in the range of 1000 to 1070 Btu / scf, and FERC (Federal Energy Regulatory Commission) has recently established guidelines and regulations for natural gas imports. These guidelines call for a Wobbe Index of imported gas relative to the quality of local gas to vary by + / - 4%, with a maximum of 1400. California, traditionally using very lean gas, requires a significantly lower Wobbe Index for imported gas. For example, the local air emission agency SCAQMD (Southern California Air Quality Man...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F17C7/00
CPCF17C2270/0136F17C2265/015F17C2227/0157F17C9/04F17C2223/033F17C2227/0135F17C2227/0362F25J2210/62F25J1/0045F25J1/005F17C2227/0185F17C2221/033F17C2221/014F25J1/0288F17C2265/036F17C2223/0161F25J1/0072F25J1/0255F17C2265/037F17C2227/0393F17C2265/034F17C2265/05F17C9/02F17C2227/0344F17C2260/046F25J1/0204F25J1/0221F25J1/0025F17C2265/07F17C2227/036F25J1/004F17C2227/0348F25J1/0222F25J1/023F25J2205/90F25J2215/02
Inventor J·马克
Owner FLUOR TECH CORP
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