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Flue gas denitration method based on advanced oxidization technology

An advanced oxidation technology and flue gas technology, applied in chemical instruments and methods, separation methods, dispersed particle separation, etc., can solve the problems of low photocatalyst activity, high energy consumption, easy deactivation, etc., and achieve low cost and low energy consumption. , The effect of low denitration cost

Inactive Publication Date: 2013-06-19
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] It can be seen that the NO oxidation methods in flue gas have the disadvantages of high energy consumption, high cost, low photocatalytic activity, and easy deactivation.

Method used

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  • Flue gas denitration method based on advanced oxidization technology
  • Flue gas denitration method based on advanced oxidization technology
  • Flue gas denitration method based on advanced oxidization technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Dust-free layout scheme for simultaneous flue gas desulfurization and denitrification

[0036] 1) Prepare a double oxidant solution, which includes 1wt% H 2 o 2 , 0.1mol / LNa 2 S 2 o 8 , and the active ingredient 0.05mol / LCl - , C(OH - ):C(HPO 4 - )=1:1;

[0037] 2) Spray the prepared double oxidant solution directly into the flue and mix it with the flue gas after dedusting. The reaction temperature of the flue is 90-110°C;

[0038] 3) The oxidized flue gas enters the absorption tower 4 and utilizes CaCO 3 The slurry simultaneously absorbs SO 2 and NO x , generate by-products such as calcium sulfite, calcium nitrate and calcium nitrite, the absorption liquid is recycled, and the by-products are recycled through the by-product recovery system 8. The flue gas enters the chimney 7 after passing through the demister 5 . The process can achieve a denitrification efficiency greater than 85%.

Embodiment 2

[0040] Dust-free layout scheme for simultaneous flue gas desulfurization and denitrification

[0041] 1) Prepare a double oxidant solution, which includes 1wt% H 2 o 2 , 5mol / LNa 2 S 2 o 8 , and the active ingredient 0.03mol / LCl - , C(OH - ):C(HPO4 - )=1:1;

[0042] 2) Spray the prepared double oxidant solution directly into the flue and mix it with the flue gas after dedusting. The reaction temperature of the flue is 90-110°C;

[0043] 3) The oxidized flue gas enters the absorption tower 4, and the urea solution is used to absorb SO at the same time 2 and NO x , generating ammonium sulfite, ammonium sulfate, N 2 , CO 2 and other by-products, the absorption liquid is recycled, and the by-products are recycled through the by-product recovery system 8. The flue gas enters the chimney 7 after passing through the demister 5 . The process can achieve a denitrification efficiency greater than 85%.

[0044] The scheme of embodiment 1 and embodiment 2 is as figure 1 sho...

Embodiment 3

[0046] Dust-containing layout scheme for simultaneous desulfurization and denitrification of flue gas

[0047] 1) Prepare a double oxidant solution, which includes 50wt% H 2 o 2 , 0.1mol / LNa 2 S 2 o 8 , and the active ingredient 0.01mol / LCl - , C(OH - ):C(HPO 4 - )=1:1;

[0048] 2) Spray the prepared double oxidant solution directly into the flue, before the high-efficiency dust collector, and the reaction temperature of the flue is 110-150°C;

[0049] 3) The oxidized flue gas enters the absorption tower 4 through the high-efficiency dust collector, and the calcium hydroxide slurry is used to absorb SO at the same time 2 and NO x , generate by-products such as calcium sulfite, calcium nitrate and calcium nitrite, the absorption liquid is recycled, and the by-products are recycled through the by-product recovery system 8. The flue gas enters the chimney 7 after passing through the demister 5 . The process can achieve a denitrification efficiency greater than 85%.

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Abstract

The invention discloses a flue gas denitration method based on an advanced oxidization technology. The method comprises the following steps of: directly jetting double-oxidizer liquid into a flue to be mixed with flue gas so that the double oxidizers oxidize NO in the flue gas into high-valence easily-soluble nitrogen oxides, such as NO2, HNO2 and HNO3; and washing the oxidized flue gas by using an alkali solution to remove the nitrogen oxides in the flue gas. According to the method, the advanced-oxidization synergistic action of the double oxidizers is adopted, so that the NO oxidizing efficiency is greatly increased and can reach over 90%; the denitration efficiency is not lower than 85% after being washed by the alkaline liquid, the denitration cost is low, the economic performance is good, and the secondary pollution does not exist; and the existing desulfurization devices can be very conveniently modified so as to realize simultaneous desulfurization and denitration.

Description

technical field [0001] The invention relates to a flue gas denitrification method based on advanced oxidation technology, which belongs to the technical field of air pollution control. Background technique [0002] my country is the world's largest coal producer and consumer, and coal accounts for 75% of the total primary energy consumption. At present, the average annual emission of nitrogen oxides in my country is about 10 million tons. During the "Eleventh Five-Year Plan" period, the rapid growth of nitrogen oxide emissions has exacerbated the deterioration of regional acid rain, making the type of acid rain change from sulfuric acid to nitric acid and sulfuric acid. partially offset by our SO 2 Great efforts have been made to reduce emissions. At the same time, it leads to the aggravation of compound air pollution such as haze and photochemical smog in cities or regions. Therefore NO x governance is imminent. [0003] Currently, the commonly used flue gas denitrifica...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/56
Inventor 王祖武王志平王红飞车垚成海容
Owner WUHAN UNIV
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