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Apparatus for removing carbon dioxide by recovering ethane from pipeline natural gas and method thereof

A decarbonation and natural gas technology, applied in chemical instruments and methods, liquefaction, organic chemistry, etc., can solve the problems of one-time investment and high energy consumption, and achieve the effects of avoiding freezing blockage, low energy consumption, and investment saving

Pending Publication Date: 2017-08-29
CHINA PETROLEUM ENG CORP LTD +2
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

This method can fundamentally solve the CO 2 The problem of freezing blockage, but the one-time investment and energy consumption are high

Method used

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  • Apparatus for removing carbon dioxide by recovering ethane from pipeline natural gas and method thereof

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Embodiment Construction

[0010] A method for recovering ethane and removing CO from pipeline natural gas 2 devices such as figure 1 As shown, it includes: dehydration and decarbonization tower 1A&1B, regeneration gas compressor 2, main heat exchanger 3, refrigeration system 4, low temperature separator 5, expander 6, demethanizer 7, demethanizer bottom reboiler 8 and Product gas compressor9. in:

[0011] Dehydration and decarbonization tower 1A&1B removes water and part of CO from feed gas 2 The dehydration and decarbonization tower 1A&1B is connected to the raw natural gas; the dehydration and decarbonization tower 1A&1B is also connected to the product natural gas at the outlet of the expander 6; the clean gas at the outlet of the dehydration and decarbonization tower 1A&1B is connected to the main heat exchanger 3; the demethanizer The natural gas at the top of 7 is connected to the main heat exchanger 3 and the expander 6 in turn, the refrigeration system 4 is connected to the main heat exchang...

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Abstract

The invention discloses an apparatus for removing carbon dioxide by recovering ethane from pipeline natural gas and a method thereof. The apparatus comprises two dehydrated decarburization towers, a main heat exchanger and a demethanation tower, wherein, the inlets at top of two dehydrated decarburization towers are connected with a raw material natural gas pipeline, the outlets at the bottom of two dehydrated decarburization towers are connected with the main heat exchanger; the main heat exchanger is connected with a low temperature separator, a gas phase outlet of the low-temperature separator is connected with an expander and the demethanation tower in order, a liquid phase outlet of the low-temperature separator is connected with the central section of the demethanation tower; the outlets at the top of the demethanation tower is connected with the main heat exchanger and the expander; the inlets at the bottom of two dehydrated decarburization towers are connected with the outlets of the expander, and the outlets at the top of two dehydrated decarburization tower is connected with a resurgent gases compressor. The adsorptivity of an adsorbent on CO2 can be directly used, CO2 can be removed at certain degree, freezing and plugging of the demethanation tower for ethane recovery are avoided, and the apparatus has the advantages of less investment and low energy consumption.

Description

technical field [0001] The invention relates to recovering ethane and removing CO in pipeline natural gas 2 The process device and method are especially suitable for the raw material gas of the ethane recovery plant as pipeline natural gas, CO 2 The gaseous condition with the content of 1.5% to 2% achieves the purpose of avoiding freezing blockage of the ethane recovery device and saving investment. Background technique [0002] In recent years, the growth rate of natural gas demand has dropped significantly. In order to realize the important transformation from focusing on the scale and speed of development to focusing on the quality and efficiency of development, the diversification of natural gas products has been realized. Implement the development strategy of improving the quality and efficiency of natural gas. Commercial natural gas contains a large amount of ethane, and this part of natural gas is currently directly transported to users as commercial natural gas wit...

Claims

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Application Information

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IPC IPC(8): C07C7/00C07C9/06C07C7/04F25J3/02
CPCC07C7/005C07C7/04F25J3/0209F25J3/0266F25J2220/66F25J2220/68F25J2200/06C07C9/06F25J3/0233F25J3/0238F25J2200/02F25J2200/70F25J2205/04F25J2205/66F25J2230/24F25J2230/32F25J2240/02
Inventor 周璇蒲黎明王科李莹珂王长锋龙海洋陈运强田静陆永康王刚张雷果王毅蒋志明
Owner CHINA PETROLEUM ENG CORP LTD
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