Method for efficiently recovering light hydrocarbons from pipeline natural gas by using energy integration

A technology for natural gas and recovery pipes, which can be used in liquid hydrocarbon mixture recovery, hydrocarbon oil treatment, petroleum industry, etc. It can solve the problems of high investment and operating costs, and achieve the effect of saving investment and operating costs

Inactive Publication Date: 2015-01-07
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The current condensation separation process generally requires external cooling energy, resulting in high investment and operating costs

Method used

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  • Method for efficiently recovering light hydrocarbons from pipeline natural gas by using energy integration
  • Method for efficiently recovering light hydrocarbons from pipeline natural gas by using energy integration
  • Method for efficiently recovering light hydrocarbons from pipeline natural gas by using energy integration

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Embodiment 1

[0029] In this embodiment, light hydrocarbons are separated by using natural gas transported in a certain section of the Second West-to-East Gas Pipeline as raw material. A certain section of the pipeline network of the Second West-East Gas Pipeline transports a large amount of natural gas every year. Separating light hydrocarbon components from pipeline natural gas can provide abundant raw materials for the ethylene industry, which has great economic and social benefits.

[0030] With a processing capacity of 600,000 standard cubic meters per hour, a raw material gas of 9 MPa, and 30°C pipeline natural gas design, energy integration is used to efficiently recover light hydrocarbons in pipeline natural gas. The components and contents of pipeline natural gas are shown in Table 1. :

[0031] Table 1. Composition and content of pipeline natural gas

[0032]

[0033]

[0034] The process flow of the method for utilizing energy integration to efficiently recover light hydro...

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PUM

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Abstract

The invention belongs to the field of separation and recovery of natural gas light hydrocarbons, and discloses a method for efficiently recovering light hydrocarbons from pipeline natural gas by using energy integration. In the method, expansion cold production provides corresponding cold energy for the light hydrocarbon separation system, expansion pressure reduction of high-pressure pipeline natural gas is used as a cold source for providing cold quantity, and intermediate reboiling and tower bottom reboiling are performed in the demethanizer to recover the cold quantity for precooling raw gas. The method maximally recovers the cold energy inside the system by efficient energy integration, and properly matches the heat exchange of material streams of various temperature regions, thereby achieving the goals of temperature grading and cascading use. The method does not need any additional independent cold source for cold production, thereby reducing the equipment investment. The method can implement higher light hydrocarbon recovery rate and effectively recover the light hydrocarbons in pipeline natural gas.

Description

technical field [0001] The invention belongs to the field of separation and recovery of light hydrocarbons in natural gas, and specifically relates to a method for efficiently recovering light hydrocarbons in natural gas transported by pipelines through energy integration in a system by fully utilizing the cold energy obtained by expanding the pressure energy of natural gas transported by high-pressure pipelines. Background technique [0002] In addition to methane, natural gas also contains a certain amount of ethane, propane, butane, pentane and heavier hydrocarbons. In order to meet the quality requirements of hydrocarbon dew point for commercial gas or pipeline gas transmission, or to obtain valuable chemical raw materials, it is necessary to separate and recover some hydrocarbons in natural gas except methane. The recovered liquid hydrocarbon mixture is called natural gas condensate, which is customarily called light hydrocarbon in my country. The process of recovering...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G5/06
CPCC10G5/06C10G2300/1025
Inventor 李亚军吴锦昌李越
Owner SOUTH CHINA UNIV OF TECH
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