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Method for removing nitric oxides from boiler smoke

A technology for nitrogen oxides and boiler flue gas, which is applied in the field of flue gas purification, can solve the problems of increasing the difficulty of process operation and increasing equipment investment, and achieves the effects of good utilization value, easy industrialization, and simple process operation.

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

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Problems solved by technology

The disadvantage of this process is that the NH produced by the reaction 3 The concentration is lower, while the required NH 3 The capacity of the absorption device must be equal to that of the NO complexing device, which will greatly increase the equipment investment required, and at the same time increase the difficulty of the operation of the entire process

Method used

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  • Method for removing nitric oxides from boiler smoke
  • Method for removing nitric oxides from boiler smoke

Examples

Experimental program
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Effect test

Embodiment 1

[0037] 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 323K, the initial pH of the complex solution is 5.5, and the NO removal rate is 97%. The regeneration device uses iron filings packed bed reactor with a diameter of 200mm and a height of 400mm, and the spray density is 0.2m 3 / (m 2 h), when 313K, 5% of the ammonia gas regenerated is absorbed by sulfuric acid to obtain ammonium sulfate, and the regenerated Fe Ⅱ The EDTA solution is recycled for absorption, and the denitrification efficiency is still around 97%.

Embodiment 2

[0039] 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 NO400×10 -6 , the absorption solution Fe Ⅱ EDTA concentration is 25mmol·L -1, the circulation volume is 80L / h, the reaction temperature is 323K, the initial pH of the complex solution is 5.5, and the NO removal rate is 98%. The regeneration device uses iron filings packed bed reactor with a diameter of 200mm and a height of 400mm, and the spray density is 0.4m 3 / (m 2 h), when 303K, the 5% ammonia gas that regenerates obtains ammonium sulfate with sulfuric acid absorption, and the Fe that regenerates goes out Ⅱ The EDTA solution is recycled for absorption, and the denitrification efficiency is still around 98%.

Embodiment 3

[0041] 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 30mmol·L -1 , the circulation volume is 100L / h, the reaction temperature is 323K, the initial pH of the complexing solution is 6.0, and the NO removal rate is above 97%. The regeneration device uses iron filings packed bed reactor with a diameter of 200mm and a height of 400mm, and the spray density is 0.6m 3 / (m 2 h), when 293K, 5% of the ammonia gas regenerated is absorbed by sulfuric acid to obtain ammonium sulfate, and the regenerated Fe Ⅱ The EDTA solution is recycled for absorption, and the denitrification efficiency is still around 96%.

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Abstract

The invention discloses a method for removing nitric oxides from boiler smoke. The method comprises the following steps of firstly introducing smoke into a Fe<II>EDTA solution, complexing and absorbing NO to obtain a ferrous acyl complex Fe<II>(NO)EDTA, introducing Fe<II>(NO)EDTA into a regenerating device, and reducing Fe<II>(NO)EDTA by virtue of metallic iron so as to regenerate Fe<II>EDTA and converting NO into high-concentration NH3 simultaneously. The method has the beneficial effects that by removing NO in smoke by virtue of a liquid-phase complexing absorbent, the technical problem that NO is difficult to enter a liquid phase is effectively solved; the absorption and the regeneration are separately carried out, so that the concentration of NH3 is increased, and the problem that an NH3 absorbing device is too large can be solved; generated NH3 can generate ammonium salt which can be taken as an industrial raw material or a reducing agent to enter other SNCR denitration reactors for boiler smoke, and hydrous precipitates of ferric oxide generated from iron can be taken as chemical products such as iron oxide red pigments.

Description

technical field [0001] The invention relates to a method for purifying flue gas, in particular to a method for removing nitrogen oxides from 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, d...

Claims

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Application Information

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