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Carbon dioxide absorbent used for capturing after combustion

A technology of carbon dioxide and absorbent, applied in chemical instruments and methods, separation of dispersed particles, air quality improvement, etc., to achieve the effects of reducing solution loss, high stability, and large application potential

Active Publication Date: 2015-05-27
SHANGHAI BOILER WORKS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These absorbents have been greatly improved over the previous one-component absorbents, but there are still some problems in terms of absorption capacity, absorption rate and energy consumption, and there are still areas for improvement

Method used

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  • Carbon dioxide absorbent used for capturing after combustion
  • Carbon dioxide absorbent used for capturing after combustion
  • Carbon dioxide absorbent used for capturing after combustion

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The components and mass fractions of sample A are: polyethyleneimine 15%, molecular weight 350, tetraethylenepentamine 5%, ethanolamine 5%, sodium sulfite 0.02%, sodium molybdate 0.02%, and the rest is water; the group of sample B The mass fractions are: polyethyleneimine 20%, molecular weight 350, N-methyldiethanolamine 5%, ethanolamine 5%, sodium sulfite 0.02%, sodium molybdate 0.02%, and the rest are water; the components of sample C and The mass fraction is: polyethyleneimine 25%, molecular weight 350, diethanolamine 5%, ethanolamine 5%, sodium sulfite 0.02%, sodium molybdate 0.02%, and the rest is water; the absorption capacity and Absorption rate, the test device such as figure 1 As shown, in a glass reactor placed in a constant temperature water bath at 45°C, 100mL of absorbent solution was added, and the volume composition was 14% CO at a flow rate of 1L / min under 1 atmosphere. 2 , 86%N 2 mixed gas, while the absorption liquid was slowly stirred at a constant ...

Embodiment 2

[0024] Select sample B as the absorption liquid, and conduct the test on a 2,000-ton / year carbon dioxide capture test platform, and introduce a part of the flue gas from a 3MW thermal test platform into the capture system. The generated flue gas, the top of the desulfurization washing tower, the top of the absorption tower and the outlet of the regenerated gas-liquid separator of the capture test bench are sampled and analyzed. The flue gas of the 3MW boiler is analyzed by the flue gas analyzer, and the gas sample of the capture test bench is analyzed by the gas chromatograph. The composition of the flue gas and the analysis results of the gas samples from the capture test bench are shown in Table 2. It can be seen from Table 2 that the concentration of carbon dioxide in the flue gas is 11.92%. After being absorbed by the absorption tower, the CO in the flue gas 2 It is reduced to 0.5%, and the removal rate of the absorption tower exceeds 95%. CO in the gas phase of the rege...

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Abstract

The invention relates to a carbon dioxide absorbent used for capturing after combustion. The carbon dioxide absorbent is characterized by being composed of a main absorbent polyethyleneimine (PEI), auxiliary absorbents TEPA, MEA, MDEA, DEA and PZ, an antioxidant sodium sulfite, potassium sulfite or ammonium sulfite, a corrosion inhibitor sodium molybdate, sodium chromate, sodium vanadate or ammonium molybdate, and water. The molecular weight of polyethyleneimine (PEI) is 300-500; polyethyleneimine has a branch shape, and the molecule comprises three amino groups including primary amine, secondary amine and tertiary amine; and compared with other types of organic amines, polyethyleneimine has higher amine density. A compound absorption solution has relatively high carbon dioxide absorption amount, relatively rapid absorption speed, low regeneration energy consumption and high stability, so that the absorbent has a very great application prospect in the aspect of capturing carbon dioxide after combustion.

Description

technical field [0001] The invention belongs to the technical field of gas separation and chemical materials, and in particular relates to a composite organic amine solution suitable for capturing carbon dioxide after combustion. Background technique [0002] In recent years, the "greenhouse effect" caused by massive carbon dioxide emissions has aroused widespread concern, and it is imminent to reduce carbon dioxide emissions. At present, fossil fuels are still the most important energy source for human beings, and until other alternative energy sources are found, the combustion of fossil fuels is still the most important source of carbon dioxide emissions for human beings. Carbon dioxide capture is considered to be the most effective way to reduce carbon dioxide emissions, among which post-combustion capture is the most mature capture method. Carbon dioxide absorbent is the core of the whole capture process and plays a key role in improving efficiency and reducing costs. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14
CPCY02A50/20Y02C20/40
Inventor 韩坤坤倪建军池国镇
Owner SHANGHAI BOILER WORKS
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