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Method for boiler flue gas denitration

A technology for boiler flue gas and denitration, which is applied in the field of flue gas purification, can solve the problems of high cost of electrolysis and unfavorable industrial applications, and achieve the effects of high absorption efficiency, convenient maintenance and simple regeneration process.

Active Publication Date: 2014-10-08
HUNAN PINGAN ENVIRONMENT PROTECTION +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of electrolysis is too high, which is not conducive to industrial application

Method used

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  • Method for boiler flue gas denitration
  • Method for boiler flue gas denitration

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Fe Ⅱ EDTA complexation absorbs NO in simulated flue gas: a sieve plate absorption tower with a diameter of 100mm and a height of 1200mm is used as the absorber, with 2 layers of sieve plates built in, and the opening rate is 17%. Simulated NO exhaust gas flow rate 20m 3 / h, including NO500×10 -6 , the absorption solution Fe Ⅱ EDTA concentration is 25mmol·L -1 , the circulation volume is 80L / h, the reaction temperature is 333K, the initial pH of the complex solution is 5.5, and the NO removal rate is 95%. The desorption device is a bubbling bed with a height of 200mm and a height of 400mm, and the aeration air volume is 2m 3 / h, at 303K, react for 8 minutes, and the desorption is complete; the regeneration device is an iron filings packed bed reactor with a diameter of 200mm and a height of 400mm, containing Fe Ⅲ The solution of EDTA is sprayed on the iron filler, the spray density is 0.6m 3 / (m 2 h), residence time 3 seconds, Fe Ⅱ EDTA is completely regenerated ...

Embodiment 2

[0045] Fe Ⅱ EDTA complexation absorbs NO in simulated flue gas: a sieve plate absorption tower with a diameter of 100mm and a height of 1200mm is used as the absorber, with 2 layers of sieve plates built in, and the opening rate is 17%. Simulated NO exhaust gas flow rate 20m 3 / h, including NO600×10 -6 , the absorption solution Fe Ⅱ EDTA concentration is 25mmol·L -1 , the circulation volume is 80L / h, the reaction temperature is 333K, the initial pH of the complex solution is 5.5, and the NO removal rate is 92%. The desorption device is a bubbling bed with a height of 200mm and a height of 400mm, and the aeration air volume is 2m 3 / h, at 313K, react for 10 minutes, and the desorption is complete; the regeneration device is an iron filings packed bed reactor with a diameter of 200mm and a height of 400mm, containing Fe Ⅲ The solution of EDTA is sprayed on the iron filler, the spray density is 0.6m 3 / (m 2 h), residence time 3 seconds, Fe Ⅱ EDTA is completely regenerated...

Embodiment 3

[0047] Fe Ⅱ EDTA complexation absorbs NO in simulated flue gas: a sieve plate absorption tower with a diameter of 100mm and a height of 1200mm is used as the absorber, with 2 layers of sieve plates built in, and the opening rate is 17%. Simulated NO exhaust gas flow rate 20m 3 / h, including NO500×10 -6 , the absorption solution Fe Ⅱ EDTA concentration is 20mmol·L -1 , the circulation volume is 60L / h, the reaction temperature is 343K, the initial pH of the complexing solution is 6.0, and the NO removal rate reaches 92%. The desorption device is a bubbling bed with a height of 200mm and a height of 400mm, and the aeration air volume is 2m 3 / h, at 323K, react for 8 minutes, and the desorption is complete; the regeneration device is an iron filings packed bed reactor with a diameter of 200mm and a height of 400mm, containing Fe Ⅲ The solution of EDTA is sprayed on the iron filler, the spray density is 0.6m 3 / (m 2 h), residence time 3 seconds, Fe Ⅱ EDTA is completely rege...

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Abstract

The invention discloses a method for boiler flue gas denitration, which belongs to the field of environment protection. The method comprises the following steps: complexing and absorbing Fe<II>EDTA (Ethylene Diamine Tetraacetic Acid), performing oxidation and desorption, and reducing and regenerating scrap iron, wherein the step of oxidation and desorption comprises the following substeps: oxidizing Fe<II> (NO)-EDTA into Fe<III>EDTA, which is incapable of absorbing NO, by using air or oxygen to release NO in the complexing and absorption product, namely FeI<II>(NO)EDTA and obtain high-concentration NOx which takes NO2 as a main component, conveying NOx into a boiler hearth, reducing NOx into nitrogen in the process that fuel is combusted in the boiler hearth, and further reducing Fe<III>EDTA obtained in the oxidation and desorption process into Fe<II>EDTA, which is used for circularly absorbing NO, by using the scrap iron, wherein an obtained byproduct, namely ferrous hydroxide, is applied to production of iron oxide red pigments. The method is high in denitration absorption efficiency, high in efficiency, low in transportation cost, convenient to maintain and particularly applicable to boiler flue gas denitration, and the NO desorption and absorbent regeneration process is simple.

Description

technical field [0001] The invention relates to a method for purifying flue gas, in particular to a method for denitrating boiler flue gas. Background technique [0002] Industrial waste gas mainly contains NO and NO 2 , and the concentration of NO is usually much higher than that of NO 2 , especially in the NOx of combustion flue gas, NO accounts for about 95%, and NO 2 accounted for less. At the same time, NO gas-liquid mass transfer resistance is high, and its solubility in water is low, so its treatment process is very difficult. The NOx emission in our country is increasing year by year at a rate of up to 10%, and it is expected to reach (2660~2970)×104t by 2020. Therefore, it is imminent to carry out research on the pollution control of NOx in the atmosphere. [0003] At present, there are three main methods of NOx pollution control: fuel denitrification technology, low NOx combustion technology and flue gas denitrification technology. However, due to various reas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/96B01D53/56
Inventor 杨超张俊丰杨柳春黄妍宁辉龙黄玉林
Owner HUNAN PINGAN ENVIRONMENT PROTECTION
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