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 reduced The effect of power consumption

Active Publication Date: 2019-12-31
CHINA PETROLEUM & CHEM CORP +1
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  • 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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1 is an existing method, which has the following steps:

[0033] Step 1: Use such as figure 2 The device shown is used for the normal pressure regeneration test, and only the normal pressure regeneration tower 2 is used, and the regenerated solution is directly sent to the absorption tower 1 after heat exchange by the pump, which is a traditional normal pressure regeneration process.

[0034] Step 2: The raw material gas is simulated 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 30w% monoethanolamine aqueous solution, the absorption temperature is 40°C, and the absorption pressure is normal pressure.

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

[0036] Step 4: Test the ob...

Embodiment 2

[0038] Step 1: Use such as figure 1 The apparatus shown was subjected to a pressurized regeneration test.

[0039] Step 2: The raw material gas is simulated 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 30w% monoethanolamine aqueous solution, the absorption temperature is 40°C, and the absorption pressure is normal pressure.

[0040]The third step: the pressure at the top of the atmospheric pressure regeneration tower 2 is 2 KPaG, the temperature of the tower bottom is 101°C, and the temperature at the top of the tower is 90°C, the pressure at the top of the pressurized regeneration tower 3 is 180 KPaG, and the temperature of the bottom of the tower is 132°C. The top temperature is 120°C, and the pressure of the heating steam is 0.6MPa. Atmospheric pressure regeneration tower 2 and pressurized regeneration tower 3 regenerate CO 2 The ratio is 0.09:1.

[0041] Step 4: Test the obtained CO ...

Embodiment 3

[0043] Step 1: Use such as figure 1 The apparatus shown was subjected to a pressurized regeneration test.

[0044] The second step: the raw material gas is simulated flue gas, the CO2 content is 15v%, the O2 content is 5v%, the rest is N2, the CO2 capture rate is 90%, the solution used is 30w% monoethanolamine aqueous solution, and the absorption temperature is 40°C, the absorption pressure is normal pressure.

[0045] The third step: the pressure at the top of the atmospheric pressure regeneration tower 2 is 5 KPaG, the temperature of the tower bottom is 102°C, and the temperature at the top of the tower is 92°C; The top temperature is 121°C, and the pressure of the heating steam is 0.6MPa. The ratio of CO2 regenerated from atmospheric pressure regeneration tower 2 and pressurized regeneration tower 3 is 0.12:1.

[0046] Step 4: The unit capture energy consumption of CO2 obtained from the test 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 an alcohol-amine method; the method is different from a traditional process for capturing carbon dioxide in flue gas by an alcohol-amine method, and the regeneration process is not single normal-pressure regeneration, but normal-pressure regeneration is firstly carried out, and then pressurized regeneration is carried out after a solution is pressurized. The method provided by the invention has the advantages of high regeneration reactionheat efficiency, remarkably reduced regeneration energy consumption, simple process, no need of introducing external high-pressure gas stripping gas, high heat utilization efficiency, high pressure ofregenerated carbon dioxide and the like, and has a good application prospect in the field of carbon dioxide capture.

Description

technical field [0001] 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 an alcohol amine method. Background technique [0002] The consumption of fossil energy will generate a large amount of carbon dioxide. Especially after humans entered the industrial revolution, with the increasing consumption of fossil energy, more and more carbon dioxide was emitted into the atmosphere, which made the concentration of carbon dioxide in the atmosphere continuously increase. On February 9, 2019, the highest ever recorded concentration of carbon dioxide in the air reached 414.27ppm at the Mauna Loa Observatory in Hawaii. Due to the greenhouse effect of carbon dioxide, the increase in its concentration has caused a series of serious environmental problems such as the melting of glaciers in the Arctic and Antarctic, the increase of extreme weather and the acidification of seawater. ...

Claims

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Application Information

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Patent Type & Authority Applications(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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