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Photo-catalytic oxidation and wet method absorption combined wet method flue-gas denitration process

A photocatalytic oxidation and photocatalyst technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problem of low treatment efficiency of high-concentration nitrogen oxides, and achieve small footprint, simple equipment, and denitrification efficiency. high effect

Inactive Publication Date: 2006-12-27
ZHEJIANG UNIV
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Problems solved by technology

However, the current research on photocatalytic oxidation treatment of nitrogen oxides is limited to the treatment of low-concentration nitrogen oxides, and the treatment efficiency for high-concentration nitrogen oxides is not high.

Method used

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  • Photo-catalytic oxidation and wet method absorption combined wet method flue-gas denitration process

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Formulated with 5% TiO 2 The suspension of the catalyst, using the coating method to immerse the glass fiber in the catalyst suspension and coat it for 3 to 5 times, after the coating is completed, the catalyst is dried at 80°C, and the catalyst loading is 0.7mg / cm 2 The loaded catalyst is folded and placed in the catalytic reactor, the ultraviolet light source is arranged in the catalytic reaction chamber, and the placement method is arranged symmetrically along the wall axis; NaOH solution is used as the denitrification absorption liquid, and the NaOH weight percentage in the solution is 5% . The flue gas to be treated enters the photocatalytic reactor for photocatalytic oxidation reaction. After testing, NO in the flue gas nitrogen oxide 2 The content of nitrogen oxides is increased from about 10% to more than 45%; the oxidized flue gas enters the absorption reactor and fully contacts with the absorption liquid. The test results of the discharged flue gas show that th...

Embodiment 2

[0025] Formulated with 5% TiO 2 The suspension of the catalyst, using the coating method to immerse the glass fiber into the catalyst suspension and coat it for 3 to 5 times, after the coating is completed, the catalyst is dried at 80°C, and the catalyst loading is 1.2mg / cm 2 The loaded catalyst is folded and placed in the catalytic reactor, the ultraviolet light source is arranged in the catalytic reaction chamber, and the placement method is arranged symmetrically along the wall axis; NaOH solution is used as the denitration absorption liquid, and the NaOH weight percentage in the solution is 10% . The flue gas to be treated enters the photocatalytic reactor for photocatalytic oxidation reaction. After testing, NO in the flue gas nitrogen oxide 2 The content of nitrogen oxides is increased from about 10% to more than 55%; the oxidized flue gas enters the absorption reactor and fully contacts with the absorption liquid. The test results of the discharged flue gas show that t...

Embodiment 3

[0027] Formulated with 5% TiO 2 The suspension of the catalyst, using the coating method to immerse the glass fiber in the catalyst suspension and coat it for 3 to 5 times, after the coating is completed, the catalyst is dried at 80°C, and the catalyst loading is 1.5mg / cm 2 The loaded catalyst is folded and placed in the catalytic reactor, the ultraviolet light source is arranged in the catalytic reaction chamber, and the placement method is symmetrically arranged along the wall axis; NaOH solution is used as the denitrification absorption liquid, and the NaOH weight percentage in the solution is 20% . The flue gas to be treated enters the photocatalytic reactor for photocatalytic oxidation reaction. After testing, NO in the flue gas nitrogen oxide 2 The content of nitrogen oxides is increased from about 10% to more than 65%; the oxidized flue gas enters the absorption reactor and fully contacts with the absorption liquid. The test results of the discharged flue gas show that...

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Abstract

Disclosed is a wet smoke denitration process of photo-catalytic oxidized combination wet absorption type, comprising oxidation process and wet process. The denitration process includes: first, passing the pending smoke through photocatalysis reactor armed with load type nano-TiO2 photocatalyst for oxidizing nitrogen oxide in the smoke, the oxidized smoke entering into wet absorption reactor for full contact with alkali, oxidative or reductive denitration absorption solution, after which, nitrogen oxide in the smoke being wet absorbed is purified and discharged. The present process, characterized in high denitration efficiency, simple equipment, convenient operation and small space occupation, is applied in smoke treatment, capable of 60 to 90% nitrogen oxide removing efficiency. NO gas-phase photo-catalytic oxidation in the smoke needs only ultraviolet radiation, which is characterized in moderate reaction condition, rapid oxidation speed and low cost. The absorbent in the absorption solution reacts with Nox in the smoke, producing non-poisonous products and resulting in simple after treatment.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a wet flue gas denitrification process that adopts photocatalytic oxidation combined with wet absorption. Background technique [0002] Atmospheric nitrogen oxide pollution is becoming more and more serious, and fuel combustion is NO X my country has also formulated strict emission standards for nitrogen oxides and has begun to levy corresponding sewage charges. Efficient, economical and feasible flue gas denitrification technology will have broad application market prospects. [0003] Wet flue gas treatment technology is a traditional flue gas treatment technology with simple process, less investment, good treatment effect and many absorbents available for application. However, wet flue gas denitrification technology has been developing slowly, the main reason being the special properties of flue gas. O in flue gas 2 The content is only 6~9%, NO x The concentra...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/56
Inventor 吴忠标王海强江博琼官宝红赵伟荣
Owner ZHEJIANG UNIV
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