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A pressurized regeneration method for capturing carbon dioxide in flue gas by alcohol amine method

A technology of carbon dioxide and alcohol amine method, which is applied in the direction of chemical instruments and methods, separation methods, inorganic chemistry, etc., can solve the problems that have not yet been applied, and the total energy consumption of the process is very limited, so as to achieve improved thermal efficiency, high heat utilization efficiency, and process simple effect

Active Publication Date: 2022-03-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] For the gas pressurized desorption technology developed by the American Carbon Capture and Utilization Technology Development Corporation, although it can obtain a higher desorption pressure, it needs to introduce an external high-pressure stripping gas, and the high-pressure stripping gas needs to be further separated. Although this technology can reduce the energy consumption of the regeneration process, the reduction of the total energy consumption of the process is very limited
Although the pressure swing regeneration process developed by Nanhua Group Research Institute has been widely used, it is aimed at the hot potash decarburization technology. The raw material gas is a pressurized cycle gas system, which is regenerated at high pressure first and then at normal pressure. , combined with the means of ejector extraction, is not suitable for the atmospheric pressure flue gas raw material system, and has not been applied in the alcohol amine capture process

Method used

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  • A pressurized regeneration method for capturing carbon dioxide in flue gas by alcohol amine method
  • A pressurized regeneration method for capturing carbon dioxide in flue gas by alcohol amine method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1 is an existing method, with the following steps:

[0033] Step 1: Using figure 2 The device shown is performed, and only the normal pressure regeneration tower 2 is used. The regenerated solution is directly sent to the absorbent tower 1 after heat exchange, which is a conventional normal pressure regeneration process.

[0034] Step 2: Raw material gas is analog flue gas, CO 2 The content is 10V%, O 2 The content is 6V%, the rest is N 2 , CO 2 The capture rate is 90%, the solution used is 30% a ethanolamine solution, the absorption temperature is 40 ° C, and the absorption pressure is normal pressure.

[0035] Step 3: The pressure regeneration tower 2 tower is 2 kPAg, the tower temperature is 101 ° C, the top temperature is 90 ° C, and the pressure of the heating steam is 0.6 MPa.

[0036] Step 4: Coles obtained by test 2 Unit capture energy consumption is 56.9 kWh / kmol co 2 .

Embodiment 2

[0038] Step 1: Using figure 1 The device shown is pressurized and regenerated.

[0039] Step 2: Raw material gas is analog flue gas, CO 2 The content is 10V%, O 2 The content is 6V%, the rest is N 2 , CO 2 The capture rate is 90%, the solution used is 30% a ethanolamine solution, the absorption temperature is 40 ° C, and the absorption pressure is normal pressure.

[0040]Step 3: Although the top of the tower of the normal pressure regeneration tower is 2 kPag, the tower temperature is 101 ° C, the top temperature is 90 ° C, the pressurized regeneration tower 3 tower pressure is 180 kPAg, the tower is 132 ° C, tower The top temperature was 120 ° C, and the pressure of heating steam was 0.6 MPa. Always press the regeneration tower 2 and the pressurized regeneration tower 3 regenerate CO 2 The ratio is 0.09: 1.

[0041] Step 4: Coles obtained by test 2 Unit trapping energy consumption of 33.5 kWh / kmol co 2 .

Embodiment 3

[0043] Step 1: Using figure 1 The device shown is pressurized and regenerated.

[0044] Step 2: The raw material gas is an analog flue gas, the CO2 content is 15V%, the O2 content is 5V%, the rest is N2, the CO2 trapping rate is 90%, the solution used is 30 w% of a ethanolamine solution, and the absorption temperature is 40 ° C, the absorption pressure is normal pressure.

[0045] The third step: the pressure regeneration tower 2 column top pressure is 5 kPag, the tower temperature is 102 ° C, the top temperature is 92 ° C, the pressurized regeneration tower 3 tower pressure is 190 kPag, the tower is 133 ° C, tower The top temperature was 121 ° C, and the pressure of heating steam was 0.6 MPa. The ratio of the constant pressure regeneration tower 2 and the pressurized regeneration tower 3 regenerate CO2 is 0.12: 1.

[0046] Step 4: The CO2 unit capture energy consumption is 30.1 kWh / kmol CO2.

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Abstract

The invention belongs to the technical field of gas separation, and relates to a pressurized regeneration method for capturing carbon dioxide in flue gas by the alcohol amine method. This method is different from the traditional technology for capturing carbon dioxide in flue gas by the alcohol amine method, and the regeneration process is not single Atmospheric pressure regeneration, but first perform atmospheric pressure regeneration, and then pressurize the solution to perform pressurized regeneration. The method provided by the invention has the advantages of high thermal efficiency of regeneration reaction, significant reduction of regeneration energy consumption, simple process, no need to introduce external high-pressure stripping gas, high heat utilization efficiency, and high pressure of carbon dioxide obtained from regeneration, and has great advantages in the field of carbon dioxide capture. Good application prospects.

Description

Technical field [0001] The present invention belongs to the field of gas separation technology, and is involved in a pressurized regeneration method of carbon dioxide in the flue gas method. Background technique [0002] The consumption of fossil energy will generate a large amount of carbon dioxide. In particular, after the human beings enter the industrial revolution, as the fossil energy consumption is increasing, more and more carbon dioxide is discharged into the atmosphere, so that the concentration of carbon dioxide in the atmosphere is constantly increasing. On February 9, 2019, the most high air in the history of the Monaroya Observatory in Hawaii has reached 414.27 ppm. Since the carbon dioxide has a greenhouse effect, its concentration has caused a series of serious environmental issues that are melted in the melter of South and Arctic glaciers, increased extremely harsh weather and seawater acidic acid. Therefore, the emission reduction of carbon dioxide has caused ge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/14C01B32/50
CPCB01D53/1475B01D53/1493B01D53/1425B01D53/1418C01B32/50B01D2258/0283B01D2257/504B01D2252/20484B01D2252/20489Y02C20/40Y02P20/50Y02P20/151
Inventor 毛松柏郭本帅陈曦汪东季燕叶宁丁雅萍
Owner CHINA PETROLEUM & CHEM CORP
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