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V-type ammonia spraying and mixing system for SCR (Selective Catalytic Reduction) smoke denitrification device

A mixing system and flue gas technology, applied in the field of flue gas purification, can solve the problems of weakening the synergy of mixing elements and weakening the mixing effect, and achieve the effects of high energy utilization efficiency, improved uniform distribution, and simple structure

Active Publication Date: 2012-08-08
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the alternating arrangement on both sides of the mixing elements weakens the synergy of the mixing elements and weakens the mixing effect

Method used

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  • V-type ammonia spraying and mixing system for SCR (Selective Catalytic Reduction) smoke denitrification device
  • V-type ammonia spraying and mixing system for SCR (Selective Catalytic Reduction) smoke denitrification device
  • V-type ammonia spraying and mixing system for SCR (Selective Catalytic Reduction) smoke denitrification device

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Such as figure 1 , 2 As shown in , 3, the V-type ammonia injection mixing system used in the SCR flue gas denitration device of a thermal power plant includes a static mixer 1, an ammonia injection branch pipe 3 with a nozzle 2 at the end, and an ammonia injection branch pipe 3 connected Ammonia injection master pipe 4. The coverage rate of the static mixer 1 in the flue is 33%. The static mixer 1 is composed of 20 mixing units 5 arranged side by side in two rows. The mixing unit 5 is composed of two rectangular blades 6 arranged in a V shape, and the blades 6 At 45° to the flue gas flow direction, the mixing unit 5 is fixed on the side wall of the flue through a stainless steel rod. In the same row, two adjacent mixing units 5 share an ammonia injection main pipe 4, and the ammonia injection main pipe 4 is connected to the supply The ammonia delivery pipes 7 for the reducing agent ammonia are connected. According to the size of the flue, a total of 10 ammonia deliver...

Embodiment 2

[0035] Such as Figure 4 , 5As shown in , 6, the V-type ammonia injection mixing system used in the SCR flue gas denitration device of a thermal power plant includes a static mixer 1, an ammonia injection branch pipe 3 with a nozzle 2 at the end, and an ammonia injection branch pipe 3 connected Ammonia injection main pipe 4; the coverage rate of static mixer 1 in the flue is 42%. Static mixer 1 is composed of 8 mixing units 5 arranged in a single row, and mixing unit 5 is composed of two V-shaped rectangular blades 6 Composed, and the vane 6 is 55° to the flue gas flow direction, the mixing unit 5 is fixed on the side wall of the flue through a stainless steel rod, two adjacent mixing units 5 form a group, and each group of mixing units 5 shares an ammonia spraying mother The pipe 4 and the ammonia injection main pipe 4 are in communication with the ammonia delivery pipe 7 that supplies the reducing agent ammonia. According to the size of the flue, four ammonia delivery pipes...

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Abstract

The invention discloses a V-type ammonia spraying and mixing system for an SCR (Selective Catalytic Reduction) smoke denitrification device. The V-type ammonia spraying and mixing system comprises static mixers, ammonia spraying branch pipes with nozzles at end parts and ammonia spraying header pipes communicated with the ammonia spraying branch pipes; each static mixer is formed by arraying a plurality of mixing units, each mixing unit is composed of two blades distributed in a V shape, and an included angle between each blade and a smoke flow is 30-60 degrees; and a nozzle opposite to each blade is arranged below the blade, and a distance between each nozzle and each blade is 0.2-1 time that of the height of the corresponding mixing unit. The V-type ammonia spraying and mixing system disclosed by the invention has the advantages of fewer nozzles and simplified ammonia spraying device; symmetric reverse vortexes can be formed with strong vortex mixing, so that a mixing process is strengthened to make ammonia distribute uniformly, and meanwhile, a distance required for achieving the goal of homogenizing the ammonia is shortened, so that the denitrification efficiency is enhanced; and the caused pressure drop is lower and the energy utilization efficiency is high.

Description

technical field [0001] The invention relates to the technical field of flue gas purification, in particular to a V-type ammonia injection mixing system used in an SCR flue gas denitrification device. Background technique [0002] With the increasingly prominent environmental problems, nitrogen oxides have become one of the main control targets of air pollution emissions in my country. Selective catalytic reduction technology (SCR) has become the first choice for flue gas denitrification technology due to its mature process, reliable operation and high denitrification efficiency. Selective catalytic reduction technology is to send the reducing agent ammonia into the flue through the ammonia pipe, mix with the flue gas in the flue, and then under the action of the catalyst, the reducing agent ammonia selectively reacts with the NOx in the flue gas, and the NOx is reduced to N2 and H2O is generated at the same time. The existing SCR flue gas denitrification system has a very ...

Claims

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Application Information

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IPC IPC(8): B01D53/76B01D53/86B01D53/56
Inventor 高翔骆仲泱岑可法倪明江宋浩吴卫红赵健张成健施正伦周劲松方梦祥余春江王树荣程乐鸣王勤辉
Owner ZHEJIANG UNIV
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