Method for improving carbon dioxide recovery rate and purity by solution recycling and regeneration

A technology of carbon dioxide and solution circulation, applied in the direction of liquid washing gas purification, removal of gas pollutants, air quality improvement, etc., can solve problems such as difficulty in obtaining purity, and achieve the effect of increasing industrial output value

Active Publication Date: 2016-11-23
SEDIN ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the invention is to solve the existing CO 2 It is not easy to obtain high-purity CO by enriching the gas through the decompression flash process 2 To solve the technical problems of product gas, provide a solution recycling method to improve the recovery rate and purity of carbon dioxide

Method used

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  • Method for improving carbon dioxide recovery rate and purity by solution recycling and regeneration

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for improving the recovery rate and purity of carbon dioxide through solution recycling and regeneration in this embodiment comprises the following steps:

[0038] (1)CO 2 absorb

[0039] First, the crude gas with a pressure of 3.0Mpa is passed through a hydrogen sulfide absorption tower to remove H 2 Sulfur element in S and COS, desulfurized crude gas flow rate from hydrogen sulfide absorption tower is 280000Nm 3 / h, temperature: -30°C, pressure: 30bar, the specific gas composition of desulfurization gas is:

[0040] composition

H 2

N 2

CO

CH 4

CO 2

∑

V％

43.6

0.72

17.7

9.9

28.08

100.0

[0041] Then enter the CO 2 Absorption tower 1, methanol lean liquid from CO 2 The top of the absorption tower 1 is injected, and the CO 2 The desulfurized gas entering the bottom of the absorption tower 1 is contacted in countercurrent, in the CO 2 Carbon dioxide removal is carried out in the absorption tow...

Embodiment 2

[0064] A method for improving the recovery rate and purity of carbon dioxide through solution recycling and regeneration in this embodiment comprises the following steps:

[0065] (1)CO 2 absorb

[0066] First, the crude gas is passed through a hydrogen sulfide absorption tower to remove H 2 Sulfur element in S and COS, desulfurized crude gas flow rate from hydrogen sulfide absorption tower is 250000Nm 3 / h, temperature: -25°C, pressure: 45bar, the specific gas composition of desulfurized gas is:

[0067] composition

H 2

N 2

CO

CH 4

CO 2

∑

V％

40.6

0.79

20.0

8.98

29.63

100.0

[0068] Then enter the CO 2 Absorption tower 1, methanol lean liquid from CO 2 The top of the absorption tower 1 is injected, and the CO 2 The desulfurized gas entering the bottom of the absorption tower 1 is contacted in countercurrent, in the CO 2 Carbon dioxide removal is carried out in the absorption tower 1, from CO 2 The solutio...

Embodiment 3

[0091] A method for improving the recovery rate and purity of carbon dioxide through solution recycling and regeneration in this embodiment comprises the following steps:

[0092] (1)CO 2 absorb

[0093] First, the crude gas is passed through a hydrogen sulfide absorption tower to remove H 2 Sulfur elements in S and COS, the desulfurized raw gas flow rate from the hydrogen sulfide absorption tower is 200,000Nm 3 / h, temperature: -12°C, pressure: 60bar, the specific gas composition of desulfurized gas is:

[0094] composition

H 2

N 2

CO

CH 4

CO 2

∑

V％

41.6

0.79

19.0

12.61

26.0

100.0

[0095] Then enter the CO 2 Absorption tower 1, methanol lean liquid from CO 2 The top of the absorption tower 1 is injected, and the CO 2 The desulfurized gas entering the bottom of the absorption tower 1 is contacted in countercurrent, in the CO 2 Carbon dioxide removal is carried out in the absorption tower 1, from CO 2 The...

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Abstract

The invention relates to a method for improving carbon dioxide recovery rate and purity by solution recycling and regeneration. In the low-pressure methanol wash process, lean methanol firstly absorbs CO2 through a CO2 absorption tower, and methanol solution rich in the CO2 is regenerated. On one hand, the CO2 absorbed and dissolved by the methanol solution is desorbed to obtain high-purity CO2 product gas (CO2 mole fraction >=99%, maximally reaching 99.9%). On the other hand, semi-lean methanol solution (CO2 mole fraction<=8%) with low CO2 content is obtained, the desorbed semi-lean methanol solution is conveyed to the middle of the CO2 absorption tower through a pump and recycled, and the high-purity CO2 product gas is concentrated to other sections according to process requirements.

Description

technical field [0001] The invention belongs to the technical field of gas purification technology, and in particular relates to a method for improving the recovery rate and purity of carbon dioxide through solution circulation and regeneration. Background technique [0002] In chemical production, low-temperature methanol washing is widely used in desulfurization and decarbonization processes, and low-temperature methanol is used to absorb acid gases in crude gas, such as: CO 2 、H 2 S, COS and other components to achieve the purpose of purifying crude gas. The methanol solution that has absorbed acid gas components will realize methanol regeneration through decompression flash evaporation, nitrogen stripping, heating regeneration and other operating means. During this process, H 2 Sulfur-rich tail gas such as S and COS can pass through the sulfur recovery device to realize the recovery and utilization of sulfur elements, while CO 2 The gas is enriched through the decomp...

Claims

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Application Information

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IPC IPC(8): C10K1/08C01B31/20
CPCC10K1/004C10K1/005C10K1/08Y02A50/20
Inventor 李晓李刚张琦宇时建敏周恩利王乔毅王贵关杰尚书娟张凤娟刁秀辉吴湘楠
Owner SEDIN ENG
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