Method for recovering ethane in high-pressure natural gases

A recovery method, natural gas technology, applied in chemical instruments and methods, liquid hydrocarbon mixture recovery, gas fuel, etc., to achieve the effects of reducing compression power, optimizing heat exchange network, improving separation efficiency and operational stability

Inactive Publication Date: 2015-11-11
PETROCHINA PLANNING & ENG INST +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the above typical ethane recovery process ( figure 2 ) to reduce the system energy consumption of the high-pressure natural gas ethane recovery device, the present inventio...

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  • Method for recovering ethane in high-pressure natural gases
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  • Method for recovering ethane in high-pressure natural gases

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Embodiment Construction

[0020] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0021] Below in conjunction with the attached in the embodiment of the present invention image 3 , clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0022] In the following description, a lot of specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described here, and those skilled in the art can do it without departing from the meaning of the present ...

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Abstract

The invention discloses a method for recovering ethane in high-pressure natural gases, relating to the technical field of natural gas processing technology. The method is characterized by combining high-pressure and low-temperature absorption, partial low-temperature gas supercooling, an externally transported gas reflux process and refrigeration with an expansion machine and dividing both the supercooled gas in a low-temperature separator and externally transported gas reflux into two parts, wherein one part of the supercooled gas and the externally transported gas reflux enter a high-pressure absorption tower and the other part of the supercooled gas and the externally transported gas reflux enter a demethanizer to improve the ethane recovery rate which can be adjusted according to the target value of the recovery rate. The method has the beneficial effects that the operating pressures of the high-pressure absorption tower and the demethanizer can be independently arranged, thus reducing the compression power of an externally transported gas booster set and the heat load of a reboiler of the demethanizer; the method is suitable for devices with feed gas pressures more than 7.0MPa for recovering ethane in the natural gases and has the characteristics of high recovery rate, low system energy consumption, and the like.

Description

technical field [0001] The invention relates to the technical field of natural gas processing technology, in particular to an ethane recovery method for high-pressure natural gas. Background technique [0002] In recent years, with the development of the natural gas industry, the technology of using expander refrigeration to recover natural gas condensate has developed rapidly. The expander refrigeration process uses the difference in raw material pressure to obtain cooling capacity. The larger the expansion ratio, the lower the outlet pressure of the expander. The more cooling capacity, the higher the condensate recovery rate. The existing typical ethane recovery flow chart is as follows: figure 2 As shown, the characteristic of the process is that the dehydrated natural gas passes through the cold box E21 for heat exchange and cooling, and then enters the low-temperature separator V21 for separation. The gas phase of the low-temperature separator is divided into two strea...

Claims

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Application Information

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IPC IPC(8): C07C9/06C07C9/08C07C7/00C07C7/11C10G5/00C10G5/04C10G5/06C10L3/12
Inventor 蒋洪丁玲蒲红宇朱聪巴玺立杨莉娜白晓东刘烨王春燕
Owner PETROCHINA PLANNING & ENG INST
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