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Integrated complex ferrous wet flue gas desulfurization and denitration method

A wet desulfurization and flue gas purification technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve problems such as inability to meet economic needs, complex procedures, multiple spaces and materials, and achieve thorough dust removal and process Simple and effective to improve the contact area

Active Publication Date: 2014-06-25
JIANGHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this invention, desulfurization and denitrification are carried out in two steps, and the process is relatively complicated, requiring more space and materials, which cannot meet the economic needs of the market.

Method used

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  • Integrated complex ferrous wet flue gas desulfurization and denitration method

Examples

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Effect test

Embodiment 1

[0028] A method for the integration of complexed ferrous flue gas wet desulfurization and denitrification, such as figure 1 shown, including the following steps:

[0029] 1) Pass the flue gas containing sulfur oxides and nitrogen oxides at a temperature of 100°C into the bottom of the absorption section of the absorption device, and the SO in the flue gas 2 The concentration is 1200-1400ppmv, the NO concentration is 500-800ppmv, the oxygen concentration is 2% (volume fraction), and the flue gas is in countercurrent contact with the complexed ferrous absorbent solution that enters the absorption device at a temperature of 30°C in the absorption section. The complexed ferrous absorbent is sprayed downward from the upper end of the absorption section by atomization. The volume ratio of the flue gas to the complexed ferrous absorbent is 50:1. The absorbent is HEDTA-Fe solution with a pH of 5.5. Concentration 0.1mol / L;

[0030] 2) The flue gas is discharged from the top of the ab...

Embodiment 2

[0035] A method for the integration of complexed ferrous flue gas wet desulfurization and denitrification, such as figure 1 shown, including the following steps:

[0036] 1) Pass the flue gas containing sulfur oxides and nitrogen oxides at a temperature of 40°C into the bottom of the absorption section of the absorption device, and the SO in the flue gas 2 The concentration is 1400-2000ppmv, the NO concentration is 500-800ppmv, the oxygen volume fraction is 3%, and the flue gas is in countercurrent contact with the complexed ferrous absorbent solution that enters the absorption device at a temperature of 60°C in the absorption section. The ferrous absorbent is sprayed downward from the upper end of the absorption section by atomization. The volume ratio of the flue gas to the complexed ferrous absorbent is 700:1. The absorbent is EDTA-Fe solution with a pH of 7.5 and a total iron concentration of 0.5. mol / L;

[0037] 2) The flue gas is discharged from the top of the absorpti...

Embodiment 3

[0042] A method for the integration of complexed ferrous flue gas wet desulfurization and denitrification, such as figure 1 shown, including the following steps:

[0043] 1) Pass the flue gas containing sulfur oxides and nitrogen oxides at a temperature of 50°C into the bottom of the absorption section of the absorption device, and the SO in the flue gas 2 The concentration is 1600-2400ppmv, the NO concentration is 500-800ppmv, the oxygen volume fraction is 5%, and the flue gas is in countercurrent contact with the complexed ferrous absorbent which enters the absorption device at a temperature of 35°C in the absorption section. The iron absorbent is sprayed downward from the upper end of the absorption section by atomization. The volume ratio of flue gas to complexed ferrous absorbent is 200:1. The absorbent is NTA-Fe solution with a pH of 6 and the total iron concentration is 0.3mol. / L;

[0044] 2) The flue gas is discharged from the top of the absorption device after bein...

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Abstract

The invention discloses an integrated complex ferrous wet flue gas desulfurization and denitration method which comprises the following steps: introducing flue gas into the bottom of an absorption section of an absorption device, and contacting the flue gas with a complex ferrous absorbent solution which is introduced into the absorption device and has the temperature of 30-60 DEG C on the absorption section in a reflux mode, wherein an ultrasonic regeneration tank is arranged at the bottom of the absorption device; and by taking complex ferrous as an absorbent, reducing the regenerated complex iron ions by adopting ultrasound-enhanced sulfite. Due to the addition of ammonium sulfite, Fe (III) EDTA (Ethylene Diamine Tetraacetic Acid) and Fe (II) EDTA (NO) can be reduced into Fe (II) EDTA, regeneration of the absorbent is promoted, byproducts subjected to desulfurization and denitration can be crystallized and recovered to serve as ammonium fertilizers, and resource utilization can be realized. The method is simple in process, high in absorption efficiency and complete in dust removal, the absorbent can be repeatedly utilized, the desulfurization rate is over 99 percent, and the denitration rate is over 97 percent.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a method for integrating ferrous flue gas wet desulfurization and denitrification. Background technique [0002] my country is the third hardest-hit area by acid rain in the world, especially in the developed coastal cities south of the Yangtze River. It is mainly caused by sulfur oxides and nitrogen oxides emitted by industrial flue gas. According to statistics, my country emits SO 2 More than 12 million tons, emission of NO X More than 8.4 million tons. So to SO 2 , NO X The control and purification of harmful gas pollution such as air pollution is very important, which is related to the development of the national economy. However, due to the large amount of flue gas emissions and the NO X NO has low solubility in water and is difficult to handle. [0003] At present, the selective catalytic reduction method is widely used in industry, that is, ammonia ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14
Inventor 余国贤黄泽朔潘威李海峰王晋黄路平吴宏观
Owner JIANGHAN UNIVERSITY
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