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Desulfurization, denitrification and demercuration integration apparatus based on amino absorber and method therefor

A technology for desulfurization, denitrification, mercury removal, and absorbent, which is applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problem of high cost of additives, and achieve the effects of low production cost, simple process and wide application range.

Inactive Publication Date: 2015-12-02
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patents on urea wet desulfurization, denitrification and demercuration include: integrated simultaneous desulfurization, denitrification and demercury absorption liquid and its preparation method and application (patent number: CN201010599929.2), application of ethylenediamine cobalt and urea wet flue gas simultaneously Desulfurization and denitrification method (patent number: CN200510100019.4), process of wet combined desulfurization and denitrification of urea enhanced with alkali metal compounds (patent number: CN200510062184.5), wet combined desulfurization of urea enhanced with chlorine-containing strong oxidant Denitrification process (patent number: CN200510062185.X) and urea wet method combined desulfurization and denitrification method of coal-fired flue gas (patent number: CN200910262978.4). The method is different from the traditional wet method, and there is no suitable device for it at present, and the additive cost of the urea wet method is relatively high, so it is urgent to develop an amino absorbent and desulfurization based on the amino absorbent. Denitrification and demercury integrated device and method thereof

Method used

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  • Desulfurization, denitrification and demercuration integration apparatus based on amino absorber and method therefor
  • Desulfurization, denitrification and demercuration integration apparatus based on amino absorber and method therefor
  • Desulfurization, denitrification and demercuration integration apparatus based on amino absorber and method therefor

Examples

Experimental program
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Effect test

Embodiment 1

[0062] Simulated flue gas: SO 2 600ppm, NO200ppm, Hg 0 20μg / m3, O 2 Concentration of 7% and balance gas N 2 .

[0063] Amino absorbent: 5% urea solution and 5% ammonium bicarbonate mixture, fully contacted with the flue gas in the intake air in the bubbling reactor, and SO in the flue gas 2 , NO x and Hg 0 Oxidative absorption reaction occurs.

[0064] The experimental results show that within 5 hours of the experiment, the desulfurization efficiency of the amino absorbent in cooperation with ammonium persulfate can reach more than 95%, and the denitration efficiency can reach about 20%. The mercury removal efficiency can reach about 20%.

Embodiment 2

[0066] Simulated flue gas: SO 2 600ppm, NO200ppm, Hg 0 20μg / m3, O 2 Concentration of 7% and balance gas N 2 .

[0067] Amino absorbent: 5% urea solution and 5% ammonium bicarbonate mixed solution, add 0.5% ammonium persulfate to the absorbing liquid, as an additive for amino absorbent desulfurization, denitrification and mercury removal, in the bubbling reactor with the intake air. The flue gas is fully in contact with the SO in the flue gas 2 , NO x and Hg 0 Oxidative absorption reaction occurs.

[0068] The experimental results show that within 5 hours of the experiment, the desulfurization efficiency of the amino absorbent in conjunction with ammonium persulfate can reach more than 95%, the denitration efficiency can reach about 70% to 95%, and the mercury removal efficiency can reach about 90%. The concentration of the solution decreases, and a small amount of ammonium persulfate is continued to be added at this time. The absorption liquid can maintain a high desulf...

Embodiment 3

[0070] Simulated flue gas: SO 2 600ppm, NO200ppm, Hg 0 20μg / m3, O 2 Concentration of 7% and balance gas N 2 .

[0071] Amino absorbent: 5% urea solution and 5% ammonium bicarbonate mixture, add 1% ammonium persulfate to the absorption liquid, as an additive for amino absorbent desulfurization, denitrification and mercury removal, in the bubbling reactor with the intake air. The flue gas is fully in contact with the SO in the flue gas 2 , NO x and Hg 0 Oxidative absorption reaction occurs.

[0072] The experimental results show that within 5 hours of the experiment, the desulfurization efficiency of the amino absorbent in cooperation with ammonium persulfate can reach more than 95%, the denitrification efficiency can reach about 75% to 95%, and the mercury removal efficiency can reach about 92%. After the reaction, the concentration of the absorbent solution decreases. At this time, a small amount of ammonium persulfate is continued to be added. This absorbent solution c...

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Abstract

The invention provides a desulfurization, denitrification and demercuration integration apparatus based on an amino absorber and a method therefor. The the amino absorber comprises the following chemical components in percentages by weight: 5% of urea, 5% of ammonia or ammonium bicarbonate, 0.5-2% of ammonium persulfate and the balance of water; and the total mass percentage of the chemical components is 100%. According to the integration apparatus provided by the invention, ammonium persulfate is added to the urea,ammonia or ammonium bicarbonate mixture to oxide NO and HgO in flue gas; the flue gas after oxidation is absorbed through a wet process, so that the efficiency of coal-burning flue gas and desulfurization, denitrification and demercuration is improved; and the amino absorber can be recycled after electrolysis of an absorbent circulating pool. In addition, the integration apparatus is simple in structure and simple in technological process, low in investment and operating cost and relatively high in removal efficiency of pollutants and free of secondary pollution.

Description

technical field [0001] The invention belongs to the technical field of air pollution control, and in particular relates to an integrated device for desulfurization, denitration and mercury removal based on an amino absorbent and a method thereof. Background technique [0002] With the continuous development of my country's economy, the problem of air pollution has gradually become prominent, and pollutants include sulfur dioxide (SO 2 ), nitrogen oxides (NO x ) and mercury, etc. Among them, SO 2 Is one of the most common pollutants in the atmosphere, studies have shown that atmospheric SO 2 can cause a variety of respiratory diseases, inhalation of excessive SO 2 Can cause suffocation or even death; SO in the atmosphere 2 It is easy to form sulfuric acid by absorbing water through oxidation, and it can form acid rain when mixed with precipitation, which has great harm to aquatic ecosystems, agricultural ecosystems, forest ecosystems, buildings and materials, and human h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14B01D53/78B01D53/48B01D53/56B01D53/64
Inventor 杨宏旻苏贤伟
Owner NANJING NORMAL UNIVERSITY