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Flue gas denitrification process and device based on ozone oxidation combined with spray cooling

A technology of spray cooling and ozone oxidation, applied in chemical instruments and methods, separation of dispersed particles, separation methods, etc., can solve problems such as easy decomposition of dinitrogen pentoxide, achieve improved stability and yield, uniform mixing, and reduced The effect of consumption

Active Publication Date: 2016-06-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The invention provides a flue gas denitrification process and device combining ozone oxidation with spray cooling, which solves the technical problem that nitrogen pentoxide is easy to decompose in the process of ozone oxidation and denitrification

Method used

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  • Flue gas denitrification process and device based on ozone oxidation combined with spray cooling
  • Flue gas denitrification process and device based on ozone oxidation combined with spray cooling

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Effect test

Embodiment 1

[0073] With device and process of the present invention, at 5m 3 The flue gas denitrification process is simulated on the experimental simulation device of / h scale. The components of flue gas are as follows: O 2 5%, NO is 400ppm, the rest is nitrogen, the flue gas temperature is 150 degrees Celsius, and the pressure is 1 atmosphere. The parameters of the absorption tower are as follows: 10% slurry limestone slurry is used for absorption, the number of spray layers is four, and the liquid-gas ratio is 5L / m 3 , the pH is controlled at 6.5. If it is directly absorbed, the denitrification efficiency at the tail end is 20%. If according to the molar ratio O 3 : The ratio of NO=1.5 is sprayed into ozone, and the second layer of spray is used to spray and cool down. The spray liquid is water, and the liquid-gas ratio is 0.5L / m 3 , the flue gas temperature drops to 50 degrees Celsius, and the formation rate of dinitrogen pentoxide at the tower can reach 60%. Combined with wet a...

Embodiment 2

[0075] With device and process of the present invention, at 5m 3 The flue gas denitrification process is simulated on the experimental simulation device of / h scale. The components of flue gas are as follows: O 2 5%, NO is 400ppm, the rest is nitrogen, the flue gas temperature is 150 degrees Celsius, and the pressure is 1 atmosphere. The parameters of the absorption tower are as follows: 10% slurry limestone slurry is used for absorption, the number of spray layers is four, and the liquid-gas ratio is 5L / m 3 , the pH is controlled at 6.5. According to the molar ratio O 3 : The ratio of NO=1.5 is sprayed into ozone, if spray cooling is not adopted, the generation rate of dinitrogen pentoxide in the flue gas entering the tower is 15%, combined with the wet absorption device, the denitrification efficiency is 60%; Layer spraying for spray cooling, the spray liquid is water, and the liquid-gas ratio is 0.5L / m 3 , the flue gas temperature can be reduced to 50 degrees Celsius, ...

Embodiment 3

[0077] Adopt device and technique of the present invention: flue gas flow rate is 4000Nm 3 / h, the flue gas composition is as follows: O 2 5%, NO is 250ppm, the rest is nitrogen, the flue gas temperature is 180 degrees Celsius, and the pressure is 1 atmosphere. The parameters of the absorption tower are as follows: 10% slurry limestone slurry is used for absorption, the number of spray layers is four, and the liquid-gas ratio is 5L / m 3 , the pH is controlled at 6.5. According to the molar ratio O 3 : The ratio of NO=1.6 is sprayed into ozone, and the second layer of spray is used to spray and cool down. The spray liquid is water, and the liquid-gas ratio is 0.5L / m 3 , the flue gas temperature can be reduced to 50 degrees Celsius, and the formation rate of dinitrogen pentoxide at the outlet can reach 60%. Combined with wet absorption device, the denitrification efficiency can reach more than 90%.

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Abstract

The invention discloses a process and device for flue gas denitrification combined with ozone oxidation and spray cooling. The process includes the following steps: (1) Boiler flue gas is sprayed and cooled after dedusting, and the flue gas after spraying and cooling enters a static mixer In the process, ozone is sprayed into the static mixer at the same time, and the boiler flue gas and ozone are mixed and oxidized; (2) The mixed gas after mixed oxidation enters the absorption tower from the bottom of the absorption tower, and the desulfurizer slurry is circulated and sprayed in the absorption tower; ( 3) The flue gas after spraying and absorption is discharged from the top of the absorption tower, and finally discharged into the atmosphere through the chimney. Compared with the single ozone oxidation denitrification process, the present invention reduces the consumption of ozone, improves the stability and yield of high-valence nitrogen oxides, makes the mixing of ozone and flue gas more uniform, and passes through the wet absorption tower Using different absorption solutions can achieve the purpose of recovering nitric acid and nitrate respectively.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a treatment process for flue gas from coal-fired boilers, especially a process for treating coal-fired flue gas containing nitrogen oxides by combining ozone gas-phase oxidation and wet absorption with spray cooling . Background technique [0002] The main methods of flue gas denitrification are selective catalytic reduction technology (SCR), selective non-catalytic reduction technology (SNCR), wet complexation absorption technology, oxidation-absorption technology, etc. SCR is currently the most commonly used denitrification method. Although this technology has high denitrification efficiency, the basic investment and operating costs are expensive. In addition, this technology has poor adaptability to medium and high-sulfur coal, and the sulfur components in the flue gas can reduce the life of the catalyst, while the coal produced in China generally has a high su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/75B01D53/76B01D53/78B01D53/56
Inventor 吴忠标孙承朗王海强刘越翁小乐
Owner ZHEJIANG UNIV