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A method of separating carbon dioxide

A carbon dioxide and a part of the technology, applied in the field of gas absorption and separation, can solve the problems of small absorption capacity of absorbent, low sensitivity of device operation, high absorption and regeneration energy consumption, etc., and achieve simple control scheme, improve operation flexibility and reduce operation cost Effect

Active Publication Date: 2020-01-03
SINOPEC ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the existing carbon dioxide separation technology has partially changed the carbon dioxide separation performance, there are still problems such as small absorption capacity of the absorbent, high absorption and regeneration energy consumption, low device operation sensitivity and high device investment.

Method used

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  • A method of separating carbon dioxide
  • A method of separating carbon dioxide
  • A method of separating carbon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] In the present embodiment, the size of the packing area of ​​the absorption tower (from the top of the tower to the bottom of the tower, the same below) is: (including the part of the rotating body), the tower height is 40000mm, and the bottom of the absorption tower is equipped with The rotating body; the size of the sieve plate of the desorption tower is: The height of the tower is 33000mm. The theoretical plate number of the absorption tower is 10, and the theoretical plate number of the desorption tower is 8. The composition of the mixed gas is shown in Table 1. The composition of the absorption liquid: 100 parts by weight of desalinated water, 69.0 parts by weight of MDEA, 3.44 parts by weight of piperazine as an activator, 0.02 parts by weight of emulsified silicone oil as a defoamer, and 0.01 part by weight of potassium metavanadate as a corrosion inhibitor.

[0055] Table 1 Mixed gas composition

[0056]

[0057] like figure 1 As shown, the carbon d...

Embodiment 2

[0067] like figure 2 As shown, the present embodiment adopts the device and method of Embodiment 1, and the difference is that two towers and two stages of absorption and desorption processes are adopted, that is, the method of the present embodiment does not include the 9000mm position from the desorption tower to the tangent line on the top of the tower. The step of taking out the second semi-lean liquid and sending it to the absorption tower to continue absorbing carbon dioxide. Reach and embodiment 1 substantially identical purification gas CO in the present embodiment 2 In terms of removal performance, various process parameters of carbon dioxide separation are listed in Table 2.

[0068] Table 2 Performance indicators of purified gas and process parameters of carbon dioxide separation

[0069]

[0070] * Regeneration = mol CO 2 / mol MDEA

[0071] It can be seen from Table 2 that the absorption capacity of the two-tower three-stage absorption and desorption proces...

Embodiment 3

[0073] In the present embodiment, the size of the packing area of ​​the absorption tower (from the top of the tower to the bottom of the tower, the same below) is: (including the part of the rotating body), the tower height is 20000mm, and the bottom of the absorption tower is equipped with The rotating body; the size of the sieve plate of the desorption tower is: The tower height is 23000mm. The number of theoretical plates of the absorption tower is 8, and the number of theoretical plates of the desorption tower is 7.

[0074] The composition of the mixed gas is shown in Table 3. The composition of the absorbing liquid is the same as in Example 1.

[0075] Table 3 Mixed Gas Composition

[0076]

[0077] like figure 2 As shown, the carbon dioxide separation method in this embodiment adopts two-tower two-stage absorption and two-stage desorption processes:

[0078] a. will contain 26.0% (volume fraction), temperature is 60 ℃, the mixed gas that pressure is 2.4...

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Abstract

The present invention discloses a carbon dioxide separation method. According to the carbon dioxide separation method, the two-tower multi-stage absorption and desorption process is used, such that the operation is convenient, the absorption efficiency and the removal efficiency of carbon dioxide are effectively improved, the absorption liquid consumption is reduced, and the operation flexibilityof the apparatus is improved; by using the heat transfer technology, the rich liquid can be heated with the low-grade heat source while the heat transfer rich liquid can be obtained, the carbon dioxide removal ability of the flash evaporation tank is increased while the heat load of the reboiler on the bottom of the desorption tower is reduced, and the absorption ability on carbon dioxide by the absorption liquid is increased so as to improve the energy utilization rate of the whole decarburization system; the carbon dioxide content in the purified gas can be subjected to linkage control by changing the temperature of the rich liquid and / or the heat load of the reboiler on the bottom of the desorption tower, such that the control scheme is simple and efficient; and the effluent of the desorption tower top is cooled to obtain the condensate, and the condensate enters the top portion of the absorption tower, such that the loss of the absorbent can be reduced so as to reduce the supplementing amounts of the fresh absorbent and the fresh water so as to further reduce the operating cost of the apparatus.

Description

technical field [0001] The present disclosure relates to a gas absorption separation method, in particular, to a method for separating carbon dioxide. Background technique [0002] Carbon dioxide, as the final product of the oxidation of carbonaceous species, has received increasing attention due to its greenhouse gas effect. Whether it is to reduce carbon dioxide emissions from the source of industrial production or to further process the mixed gas containing carbon dioxide, a lot of research work has been carried out in the fields of carbon dioxide capture, sequestration, utilization and storage at home and abroad. There are many known carbon dioxide capture and separation methods, including physical separation (adsorption, membrane separation, cryogenics), chemical absorption, and physical and chemical separation methods. [0003] At present, the industrial methods for carbon dioxide separation mainly include: low-temperature methanol washing process, Benfield method, ac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/14C01B32/50
CPCB01D53/1406B01D53/1418B01D53/1425B01D53/1456B01D53/1468B01D2252/20478B01D2252/30B01D2257/304B01D2257/504Y02C20/40Y02P20/151
Inventor 张旭戴文松窦隽虹张建峥
Owner SINOPEC ENG
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