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Heavy hydrocarbon removal system for lean natural gas liquefaction

A natural gas and liquid flow technology, applied in liquefaction, refrigeration and liquefaction, gas fuel, etc., can solve problems such as low liquefaction efficiency

Active Publication Date: 2018-01-30
AIR PROD & CHEM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

as stated above and as figure 1 As shown, one disadvantage of the existing process for removing heavy hydrocarbons system 130 is that in order to achieve gas-liquid phase separation, the system must operate at a pressure lower than the critical pressure of the natural gas feedstock
The system needs to compensate the heat load to provide additional cooling, which may result in lower liquefaction efficiency

Method used

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  • Heavy hydrocarbon removal system for lean natural gas liquefaction
  • Heavy hydrocarbon removal system for lean natural gas liquefaction
  • Heavy hydrocarbon removal system for lean natural gas liquefaction

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Embodiment Construction

[0083] The invention provides a new method integrated with the natural gas liquefaction process. This method, in the scrubber, reflux drum, reaches the temperature and pressure of the natural gas feed stream to provide effective reflux and condensate duty to the scrubber.

[0084] As noted above, conventional scrubber configurations are inefficient or energy intensive when natural gas feedstreams contain low ("lean") C2-C5 components and contain significant amounts of heavy hydrocarbons. The inventors found that the efficiency of HHC removal and liquefaction performance can be improved by introducing an economizer heat exchanger between the MCHE and the reflux drum, and changing the pressure of the raw material gas in the process of removing heavy hydrocarbons.

[0085] More specifically, the separation performance and energy efficiency of the overall process is improved by operating the reflux drum at a temperature significantly different from that of the raw natural gas exit...

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Abstract

A system and method for integrated heavy hydrocarbon removal in a liquefaction system having a lean natural gas source are provided. An economizer located between a main cryogenic heat exchanger and areflux drum is provided to cool an overhead vapor stream against a partially condensed stream. In addition, pressure of the natural gas feed stream is maintained into a scrub column. A pressure dropis provided by a valve located between the economizer and the reflux drum on a partially condensed stream withdrawn from the cold end of the warm section of the main cryogenic heat exchanger.

Description

technical field [0001] The present invention relates to methods and systems for separating heavy hydrocarbons from natural gas feedstreams and liquefied natural gas feedstreams. Background technique [0002] Removal of heavy hydrocarbons (also called "HHCs"), such as C6+ hydrocarbons (hydrocarbons containing 6 or more carbon atoms) and aromatic hydrocarbons (such as benzene, toluene, ethylbenzene and xylenes) prior to natural gas liquefaction, Often it is ideal to keep these components from freezing in the main cryogenic heat exchanger (also known as "MCHE"). And C2-C5+ hydrocarbons (hydrocarbons containing 2 to 5 or more carbon atoms), also known as natural gas liquids (or "NGLs") in the field, because of their relatively high market value, usually also from separated from natural gas. [0003] Natural gas feedstocks are typically drawn from conventional natural gas deposits, as well as unconventional natural gas deposits such as shale gas, tight gas and coalbed methane. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F25J3/06
CPCF25J1/0052F25J1/0055F25J1/0087F25J1/0212F25J1/0216F25J1/0238F25J1/0241F25J1/0262F25J2245/02F25J1/0022F25J1/0045F25J2210/06F25J2220/64C10L3/10F25J1/0205F25J1/0214F25J1/0252F25J3/08F25J2210/60F25J2215/04F25J3/0209F25J3/0238F25J2200/72F25J2205/02F25J2215/60F25J2230/60F25J2235/02F25J2240/40F25J2270/02
Inventor 陈飞M.J.罗伯茨C.M.奥特A.O.韦斯特
Owner AIR PROD & CHEM INC