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SCR denitration system

A technology of denitration and rectification grid, applied in the field of SCR denitration system, can solve the problems of ammonia escape, air preheater blockage, low denitration efficiency, etc., and achieve the effect of improving reaction efficiency, reducing ammonia overflow and improving denitration efficiency.

Pending Publication Date: 2019-11-19
CHINA HUADIAN ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of low denitrification efficiency, ammonia escape and subsequent air preheater blockage caused by uneven distribution of ammonia nitrogen in the SCR denitrification process, thereby providing an SCR denitrification system

Method used

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Embodiment 1

[0047] This embodiment provides an SCR denitrification system, such as figure 1 As shown, it includes a main body 2. The main body 2 includes a flow section and a reaction section connected in sequence. The end of the flow section away from the reaction section is the flue gas inlet 1, and the end of the reaction section far away from the flow section is the flue gas outlet. Also includes,

[0048] The first mixing unit includes a first rectifying grid 6 and a first static mixer 4, the first rectifying grid 6 is arranged in the reaction section, and the first static mixer 4 is arranged in the circulation section near the flue gas inlet 1;

[0049] The first catalyst layer 7 and the second mixing unit 8, the second mixing unit 8 is arranged in the reaction section, and the first catalyst layer 7 is arranged between the first rectifying grid 6 and the second mixing unit 8 and is located in the reaction section , the second mixing unit 8 is a second rectifying grid or a second s...

Embodiment 2

[0059] This embodiment provides an SCR denitrification system. On the basis of the above-mentioned embodiment 1, the system further includes a third catalyst layer 11 disposed in the reaction section and disposed away from the first catalyst layer 7 relative to the second catalyst layer 9 . By setting the third catalyst layer 11, the unreacted NOx and NH passing through the first catalyst layer 7 and the second catalyst layer 9 3 The reaction is carried out again in the third catalyst layer 11, thereby avoiding unreacted NOx and NH 3 Directly discharged, effectively reducing the amount of ammonia overflow and improving the denitrification efficiency of the system.

Embodiment 3

[0061] This embodiment provides an SCR denitrification system, such as figure 1 As shown, on the basis of the above-mentioned embodiment 2, the system further includes a third mixing unit 10, which is arranged in the reaction section and is arranged between the second catalyst layer and the third catalyst layer, and the third mixing unit 10 is the third Rectification grid or third static mixer. In this embodiment, the second static mixer includes, but is not limited to, square blade or circular blade mixers.

[0062] In the above SCR denitration system, the second mixing unit 8 is arranged between the first catalyst layer 7 and the second catalyst layer 9 , and the third mixing unit 10 is arranged between the second catalyst layer 9 and the third catalyst layer 11 . Unreacted NOx and NH after flowing through the first catalyst layer 3 Mix again when passing through the second mixing unit 8, so that there is a more uniform velocity field and concentration field when passing t...

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Abstract

The invention provides an SCR denitration system. According to the invention, a first mixing unit, a first catalyst layer, a second mixing unit and a second catalyst layer are arranged in a main bodyand successively arranged along the flowing direction of flue gas. In the above-mentioned system, the flue gas is mixed by the first mixing unit; mixed flue gas flows through the first catalyst layerfor a reaction; unreacted NOx and NH3 flow out of the first catalyst layer and are in non-uniform flow-field distribution and concentration distribution; through arrangement of the second mixing unit,the flue gas is mixed again, so a nitrogen-ammonia mixture has more uniform velocity field and concentration field before flowing through the second catalyst layer, and can fully react when flowing through the second catalyst layer; thus, a large amount of an unreacted nitrogen-ammonia mixture is avoided from being discharged, and denitration efficiency of the whole SCR denitration system is improved.

Description

technical field [0001] The invention relates to the field of flue gas denitrification, in particular to an SCR denitrification system. Background technique [0002] Selective catalytic reduction (SCR) technology is currently the most widely used and most effective mainstream denitrification technology, and the denitrification efficiency can reach more than 80%. The principle of this technology is: under the action of a catalyst, ammonia is sprayed into the flue gas at 280-420 ° C, so that ammonia and nitrogen oxides undergo redox reactions on the surface of the catalyst, and then converted into non-toxic and pollution-free nitrogen and water . Since the reaction occurs at the moment when ammonia and nitrogen oxides contact the catalyst, and the catalyst structure is porous and the material is relatively fragile, the flow field uniformity and flow velocity distribution of the SCR denitrification system are particularly important, which directly affect the denitrification per...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/90B01D53/56
CPCB01D53/8631B01D53/90B01D2251/2062B01D2258/0283
Inventor 胡小夫汪洋王云高春昱郝正苏军划王争荣李伟王桦
Owner CHINA HUADIAN ENG
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