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Smoke denitration method and device

A denitration and flue gas technology, applied in the field of flue gas purification, can solve the problems of increasing operating costs, large consumption of denitration oxidant absorbent, and low denitration efficiency, and achieves the effects of reducing consumption, reducing consumption and improving denitration efficiency.

Active Publication Date: 2015-01-07
FUJIAN LONGKING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the above method of oxidative denitrification has the advantages of less investment, small footprint, simple process, and strong adaptability, its denitrification efficiency is low, and it will cause excessive consumption of denitrification oxidants and absorbents, which will increase operating costs.

Method used

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  • Smoke denitration method and device

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Effect test

Embodiment 1

[0064] The method provided by the present invention is used for the generator set in Comparative Example 1, and the circular denitrification oxidation reactor with a diameter of 7.6m and a length of 20m is set, the flue gas flow rate is 8m / s, the outlet of the denitrification oxidation reactor and the absorption reactor The inlet is connected, using 82% pure sodium chlorite (NaClO 2 ) as denitration oxidant, 85% purity Ca(OH) 2 As an absorbent, the denitrification oxidant is placed in the denitrification oxidation reactor, and the absorbent is placed in the absorption reactor.

[0065] On the basis of not changing the basic operating parameters of the system, the denitrification oxidation reactor and the absorption reactor were put into operation. When the denitrification oxidant sodium chlorite was used at 572kg / h, the NOx concentration in the flue gas at the outlet of the absorption reactor was detected to be 100mg / Nm 3 .

[0066] The calculated denitrification efficiency ...

Embodiment 2

[0068] The method provided by the present invention is used for the generator set in Comparative Example 1, and the circular denitrification oxidation reactor with a diameter of 7.6m and a length of 20m is set, the flue gas flow rate is 8m / s, the outlet of the denitrification oxidation reactor and the absorption reactor The inlet is connected, using 82% pure sodium chlorite (NaClO 2 ) as denitration oxidant, 85% purity Ca(OH) 2 as an absorbent.

[0069]On the basis of not changing the basic operating parameters of the system, the denitrification oxidation reactor and the absorption reactor were put into operation. When the consumption of sodium chlorite, the denitrification oxidant, was 715kg / h, the NOx concentration in the flue gas at the outlet of the absorption reactor was detected to be 60mg / Nm 3 .

[0070] The calculated denitrification efficiency is 81.25%. At this time, the absorbent Ca(OH) 2 The consumption is 253kg / h. Compared with the comparative example, under th...

Embodiment 3

[0076] The method provided by the present invention is used for the generator set in Comparative Example 2, and a circular denitrification oxidation reactor with a diameter of 7.6m and a length of 20m is set, the flue gas flow rate is 8m / s, the outlet of the denitrification oxidation reactor and the inlet of the absorption reactor Connected, using 32% pure hydrogen peroxide (H 2 o 2 ) as denitration oxidant, 85% purity Ca(OH) 2 As an absorbent, the denitrification oxidant is placed in the denitrification oxidation reactor, and the absorbent is placed in the absorption reactor.

[0077] On the basis of not changing the basic operating parameters of the system, the denitrification oxidation reactor and the absorption reactor were put into operation. When the denitrification oxidant hydrogen peroxide dosage was 1120kg / h, the NOx concentration in the flue gas at the outlet of the absorption reactor was detected to be 100mg / Nm 3 .

[0078] The calculated denitrification efficien...

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Abstract

The invention provides a smoke denitration method. The smoke denitration method comprises the following steps: carrying out oxidation reaction on to-be-denitrated smoke and a denitration oxidant; carrying out absorption reaction on the smoke subjected to the oxidation reaction when the smoke flowing through an absorbent and finishing the denitration of the smoke. According to the method provided by the invention, oxidation reaction and absorption reaction are sequentially carried out on the to-be-denitrated smoke; in the process of oxidation reaction, NO, a main component difficult to dissolve in water in NOx in the smoke is converted to high-valence nitrogen oxides easy to dissolve in water, such as NO2; then in the process of absorption reaction, the high-valence nitrogen oxides, such as NO2 react with water and an alkaline absorbent to finish the denitration process. The method provided by the invention ensures that oxidation reaction and absorption reaction are fully carried out, the denitration efficiency is improved, and the consumption of materials, such as a the denitration oxidant and the absorbent is reduced.

Description

technical field [0001] The invention relates to the technical field of flue gas purification, in particular to a method and device for flue gas denitrification. Background technique [0002] NO since the 1970s X The problem of air pollution in China has been paid more and more attention. It has been found that: the harm to human health, high content of nitric acid rain, photochemical smog, ozone reduction and other problems are all related to low concentration of NO X It does, and it's far more harmful than was originally thought. NOx emitted from industrial flue gas is the main source of NOx in air pollution. [0003] At present, the conventional methods of flue gas denitrification are selective non-catalytic reduction (SNCR) and selective catalytic reduction (SCR). Among them, the reaction temperature of SNCR is 850°C-1100°C, and the reaction temperature of SCR is 300°C-400°C. These two methods of flue gas denitrification require a relatively high temperature in the re...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/56
Inventor 王建春张原余华龙张哲然林春源詹威全林启桃饶益龙苏碧香
Owner FUJIAN LONGKING
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