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A method for recovering ethane from high-pressure natural gas

A recovery method, natural gas technology, applied in chemical instruments and methods, climate sustainability, absorption purification/separation, etc., can solve the difficulty of reboiler and raw gas heat integration, increase energy consumption and investment of public works, reboil Improve the temperature and heat load of the device to achieve the effect of high pressure, enhanced adaptability and reduced compression work

Active Publication Date: 2021-06-22
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional RSV ethane recovery process has the following problems: (1) When recovering ethane in natural gas, the pressure of the demethanizer is limited by the heat integration of the feed gas and the reboiler of the demethanizer, and the pressure of the demethanizer should not be too high (3.5MPa)
For high-pressure natural gas (greater than 6MPa) ethane recovery, when the system adopts the combined refrigeration of expander and propane refrigeration, the outlet pressure of the expander will be lower, and the external compression work will increase.
(2) By increasing the pressure of the demethanizer and reducing the external compression work, the temperature and heat load of the reboiler at the bottom of the demethanizer will increase, and the heat integration between the reboiler of the demethanizer and the feed gas will be difficult. If an external heating source is required, Increased utility energy consumption and investment
(3) Too high pressure in the demethanizer (greater than 3.5MPa) will lead to a reduction in the separation efficiency of the tray

Method used

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  • A method for recovering ethane from high-pressure natural gas
  • A method for recovering ethane from high-pressure natural gas
  • A method for recovering ethane from high-pressure natural gas

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0032] Composition and working conditions of raw material gas after dehydration:

[0033] Raw gas processing scale: 1000×10 4 m 3 / d

[0034] Raw gas pressure: 7.0MPa

[0035] Feed gas temperature: 33°C

[0036] Natural gas export pressure: ≥6.0MPa

[0037] The raw gas composition is shown in Table 1.

[0038] Table 1. Composition of feed gas after dehydration

[0039] natural gas components N 2

CO 2

C 1

C 2

C 3

iC 4

c 4

Natural gas composition, mol% 0.61 3.00 89.09 4.70 1.40 0.27 0.30 natural gas components iC 5

c 5

C 6

C 7

C 8

C 9

C 10

Natural gas composition, mol% 0.13 0.09 0.13 0.10 0.09 0.06 0.04

[0040] The process flow sheet of natural gas ethane recovery method embodiment 1 provided by the invention is as image 3 As shown, the process is briefly described as follows:

[0041] (1) After dehydration, the raw material gas (7.0MPa, 34°C) is cooled to -43°C...

example 2

[0051] Composition and working conditions of raw material gas after dehydration:

[0052] Raw gas processing scale: 1000×10 4 m 3 / d

[0053] Raw gas pressure: 8.0MPa

[0054] Feed gas temperature: 37°C

[0055] Natural gas export pressure: ≥6.0MPa

[0056] The raw gas composition is shown in Table 3.

[0057] Table 3. Raw material gas composition after dehydration

[0058] natural gas components N 2

CO 2

C 1

C 2

C 3

iC 4

c 4

Natural gas composition, mol% 1.02 0.1 88.54 7.41 1.50 0.3 0.31 natural gas components iC 5

c 5

C 6

C 7

C 8

C 9

C 10

Natural gas composition, mol% 0.13 0.09 0.15 0.20 0.18 0.05 0.02

[0059] The process flow diagram of the natural gas ethane recovery method embodiment 2 provided by the invention is as Figure 4 As shown, the process is briefly described as follows:

[0060] (1) After dehydration, the raw material gas (8.0MPa, 37°C) is coole...

example 3

[0069] Composition and working conditions of raw material gas after dehydration:

[0070] Raw material gas treatment scale: 1000×104m3 / d

[0071] Raw gas pressure: 6.0MPa

[0072] Feed gas temperature: 37°C

[0073] Natural gas export pressure: ≥6.0MPa

[0074] The raw gas composition is shown in Table 5.

[0075] Feed gas composition after table 5 dehydration

[0076] natural gas components N 2

CO 2

C 1

C 2

C 3

c 4

Natural gas composition, mol% 0.61 2 90.09 4.7 1.40 0.4 natural gas components iC 5

c 5

C 6

C 7

C 8

C 10

Natural gas composition, mol% 0.13 0.09 0.13 0.10 0.09 0.04

[0077] The process flow diagram of the natural gas ethane recovery method embodiment 3 provided by the invention is as Figure 5 As shown, the process is briefly described as follows:

[0078] After dehydration, the raw material gas (6.0MPa, 37°C) is cooled to -43°C by the main cold box (E11) and the...

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Abstract

The invention discloses a method for recovering ethane from high-pressure natural gas, and relates to the technical field of natural gas processing technology. In the method, a traditional demethanizer is respectively set as a high-pressure absorption tower and a demethanizer, and the pressure of the high-pressure absorption tower and the demethanizer can be independent The two towers are connected by the compressor at the top of the demethanizer; the high-pressure absorption tower increases the gas phase discharge pressure at the top of the high-pressure absorption tower, which is beneficial to reduce the compression work of the external gas; the temperature at the top of the demethanizer increases, which is conducive to To increase the carbon dioxide freezing margin, the demethanizer operates at a lower pressure, which is conducive to the heat integration of the feed gas and the reboiler at the bottom of the demethanizer. The energy-saving effect of the ethane recovery unit is remarkable, and it is suitable for the ethane recovery unit whose feed gas pressure is higher than 6MPa.

Description

technical field [0001] The invention relates to the technical field of natural gas processing technology, in particular to an ethane recovery method of high-pressure natural gas. Background technique [0002] The ethane recovery process scheme is closely related to the pressure of the feed gas. The condensate gas field natural gas treatment plants developed in my country's Xinjiang, Tarim and other gas fields have high inlet pressure (up to 12MPa), and the ethane content exceeds 5%. It is necessary to recover ethane, which can improve resource utilization and effectively create more Economic Value. The ethane recovery process is a low-temperature production system with high energy consumption, and its energy consumption directly affects the economic benefits of ethane recovery. At present, the natural gas ethane recovery process is generally developing in the direction of high yield, low energy consumption and simplified process. There are many types of ethane recovery pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C9/06C07C7/04C07C7/11
CPCC07C7/005C07C7/04C07C7/11C07C9/06Y02P20/10
Inventor 蒋洪王金波黄靖珊李浩玉杨铜林
Owner SOUTHWEST PETROLEUM UNIV
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