Method for denitrifying flue gas by using chlorine dioxide

A chlorine dioxide and chlorine dioxide oxidation technology, applied in the field of flue gas denitrification, can solve the problems of high cost and poor denitrification effect of chlorine dioxide, and achieve the effect of obvious cost advantage

Pending Publication Date: 2020-06-16
SHANDONG NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Different from the existing technical route, the present invention provides a method for flue gas denitrification using chlo

Method used

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  • Method for denitrifying flue gas by using chlorine dioxide
  • Method for denitrifying flue gas by using chlorine dioxide
  • Method for denitrifying flue gas by using chlorine dioxide

Examples

Experimental program
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Embodiment 1

[0080] combined with figure 1 , the present invention is described:

[0081] A turbulent ball tower, a cylinder with a diameter of 0.8m, a tower height of 5m, and a wall thickness of 8mm, made of 304L stainless steel. It consists of a tower shell, a support plate 1, a turbulent ball 4, a retaining net 2, and a demister 15. The support plate 1 is installed at a position 2 meters away from the bottom of the tower shell. The support plate 1 is a circular grating structure with a gap spacing of 15 mm, a porosity of 0.3, and a material of 304 stainless steel. There is a retaining net 2 at 1.5m above the supporting plate 1, and the hole diameter of the retaining net 2 is 20mm. The space between the supporting plate 1 and the retaining net 2 is the turbulent ball area 3, and the turbulent ball 4 is placed in the turbulent ball area 3, and the turbulent ball 4 is a 34mm hollow PE ball, and the accumulation height of the turbulent ball is about 0.4m when it is empty. The flue gas i...

Embodiment 2

[0086] combined with figure 2 , attached image 3 , the present invention is described:

[0087] A spray tower, a cylinder with a diameter of 0.8m, a tower height of 5m, a wall thickness of 8mm, made of 304L stainless steel. A sprinkler 1 is installed at a position 1 meter away from the top of the tower, and the sprinkler 1 is composed of three 90° conical solid nozzles 2, which are evenly arranged in a cross section. Sprinkler 1 is connected to nitric acid inlet pipe 4; chlorine dioxide distributor 5 is located 0.8m below sprinkler 1, chlorine dioxide distributor 5 is a plane spiral tube, the lower part of the tube is facing the flue gas A number of small holes of 1 mm are evenly opened in the direction. The chlorine dioxide distributor 5 is connected to the intake pipe 6 of chlorine dioxide. At a position 1.5m away from the bottom of the tower, the spray tower is provided with a flue gas inlet 7, and a flue gas outlet 8 is set at the top. The bottom of the spray tower ...

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Abstract

The invention provides a method for denitrifying flue gas by using chlorine dioxide. The method comprises the steps: (1) preparing chlorine dioxide; (2) in a nitric acid environment, making chlorine dioxide contact with flue gas, and oxidizing nitric oxide in the flue gas into high-valence nitric oxide by the chlorine dioxide; and meanwhile, absorbing high-valence nitric oxide with nitric acid; and (3) separating the flue gas from a liquid. According to the invention, nitric acid is used as an absorbent, and the technical problems of poor denitration effect and high cost of chlorine dioxide inthe prior art can be solved.

Description

technical field [0001] The invention relates to the field of flue gas denitrification, in particular to a method for flue gas denitrification by using chlorine dioxide. Background technique [0002] Coal-fired power generation, steelmaking in steel mills, and other processes that use coal and petroleum as heat sources are one of the main sources of increased nitrogen oxides in the environment. In order to reduce the impact on the environment, various manufacturers have adopted many methods to reduce the emission of nitrogen oxides in the combustion tail gas ("flue gas" mentioned in the present invention), that is, to perform denitrification treatment on the flue gas. In general flue gas, NO often accounts for about 90% of the total nitrogen oxides, but NO is difficult to dissolve in water, so it is difficult to remove it by washing with water or neutralizing with lye, which is also the difficulty of flue gas denitrification where. There are two main types of existing flue ...

Claims

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Application Information

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IPC IPC(8): B01D53/75B01D53/76B01D53/78B01D53/56
CPCB01D53/56B01D53/75B01D53/76B01D53/78B01D2251/108B01D2258/0283
Inventor 刘明张菡英赵莉钤小平
Owner SHANDONG NORMAL UNIV
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