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Boiler flue gas ozonation and denitration method

A technology for ozone oxidation and boiler flue gas, applied in chemical instruments and methods, separation methods, separation of dispersed particles, etc., can solve the problems of low efficiency and achieve the effects of high efficiency, low investment and short time

Inactive Publication Date: 2019-01-18
实友化工(扬州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the defect of low efficiency of the absorbent for NO absorption in the denitrification technology, and to provide a method for boiler flue gas ozone oxidation denitrification

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Utilize the boiler flue gas ozone oxidation denitrification method of the present invention, in 5m 3 The flue gas denitrification process is simulated on the experimental simulation device of / h scale. Flue gas volume 5m 3 / h, the flue gas composition is as follows: O 2 5%, NO is 200ppm, the rest is N 2 , the flue gas temperature in the boiler flue is 200°C and the pressure is 1 atmosphere. Ozone reacts with nitric oxide in the flue for 0.2s, the volume ratio of oxygen to ozone is 1:20, the molar amount of ozone is 0.5 times the molar amount of nitric oxide, and the volume ratio of absorption liquid to mixed gas is: 1: 500. The temperature of deionized water is 100°C, the ratio of magnesium sulfite to potassium permanganate by weight is 1:1.3, the ratio by weight of potassium permanganate to deionized water is 1:100, and the final denitrification rate is 92% .

Embodiment 2

[0031] Utilize the boiler flue gas ozone oxidation denitrification method of the present invention, in 5m 3 The flue gas denitrification process is simulated on the experimental simulation device of / h scale. Flue gas volume 5m 3 / h, the flue gas composition is as follows: O 2 5%, NO is 200ppm, the rest is N 2 , the flue gas temperature in the boiler flue is 220°C and the pressure is 1 atmosphere. Ozone and nitric oxide in the flue undergo an oxidation reaction for 0.4s, the volume ratio of oxygen to ozone is 1:35, the molar amount of ozone is 1.5 times the molar amount of nitric oxide, and the volume ratio of absorption liquid to mixed gas is: 1: 800. The temperature of deionized water is 90°C, the ratio of magnesium sulfite to potassium permanganate by weight is 1:1.2, the ratio by weight of potassium permanganate to deionized water is 1:300, and the final denitrification rate is 94%. .

Embodiment 3

[0033] Utilize the boiler flue gas ozone oxidation denitrification method of the present invention, in 5m 3 The flue gas denitrification process is simulated on the experimental simulation device of / h scale. Flue gas volume 5m 3 / h, the flue gas composition is as follows: O 2 5%, NO is 200ppm, the rest is N 2 , the flue gas temperature in the boiler flue is 250°C and the pressure is 1 atmosphere. Ozone and nitric oxide in the flue undergo an oxidation reaction for 0.6s, the volume ratio of oxygen to ozone is 1:50, the molar amount of ozone is 2.5 times the molar amount of nitric oxide, and the volume ratio of absorption liquid to mixed gas is: 1: 1000. The temperature of deionized water is 80°C, the ratio of magnesium sulfite to potassium permanganate by weight is 1:1, the ratio by weight of potassium permanganate to deionized water is 1:500, and the final denitrification rate is 95%. .

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Abstract

The invention belongs to the technical field of environmental protection, and particularly relates to a boiler flue gas ozonation and denitration method which comprises the following steps: spraying oxygen into a boiler flue; when the temperature of the boiler flue is reduced to 200-250 DEG C, spraying ozone into the boiler flue, wherein the ozone experiences an oxidation reaction with nitrogen monoxide in the flue to generate a mixed gas of NO2, NO3 and N2O5; feeding the mixed gas into a denitration absorption tower from the bottom of the denitration absorption tower; adding absorption liquidinto a tower kettle of the denitration absorption tower; pumping the absorption liquid to the upper part of the denitration absorption tower by a circulating pump; performing spray circulation absorption to realize denitration of the mixed gas; discharging the denitrated flue gas through a chimney. With a high denitration rate, the method provided by the invention greatly reduces air pollution and realizes harmless treatment of the flue gas and thus completely satisfies current discharge standard.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a boiler flue gas ozone oxidation denitrification method. 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 sulfur content. Therefore, judging from my country's current national conditions, it is difficult to vigorously promote SCR technology in China. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/76B01D53/56
CPCB01D53/56B01D53/76B01D53/78
Inventor 郑永耀
Owner 实友化工(扬州)有限公司
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