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Tangential double vortex SCR mixer

A mixer and double eddy current technology, applied in fluid mixers, mixers, chemical instruments and methods, etc., can solve the problems of increased system pressure drop, increased power consumption of induced draft fans, etc., to solve the problem of insufficient ammonia mixing distance, Advantages of manufacturing costs and maintenance costs, the effect of long service life

Active Publication Date: 2014-07-23
SOUTHEAST UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With efficient mixing, the pressure drop of the system will also increase, resulting in an increase in the power consumption of the induced draft fan. Therefore, it is an important issue to design an efficient mixer and reasonably balance economical and environmental issues.

Method used

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  • Tangential double vortex SCR mixer
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  • Tangential double vortex SCR mixer

Examples

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings.

[0022] Such as figure 1 with figure 2 As shown, a tangential double vortex SCR mixer, a group of support beams 4 are equidistantly arranged on the section of the flue 7, and the support beams 4 divide the section of the flue into several mixer unit areas, and the mixer The unit area includes a group of mixer units, the mixer unit includes a group of trapezoidal plates 1, a group of nozzles 2, support beams 4, support rods 3, the bottom edge of the trapezoidal plates 1 is connected with the support beams 4, and the support One end of the rod 3 is fixed on the trapezoidal plate 1, and the other end is fixed on the inner wall of the flue 7, the trapezoidal plate 1 is downward and at 30°-60° to the incoming smoke 6; each nozzle 2 is set on the adjacent trapezoidal Between the plates 1, a group of nozzles 2 share an air supply branch pipe 5; the support beam 4 has a squa...

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Abstract

The invention discloses a tangential double vortex SCR mixer. The mixer comprises a flue, the cross section of the flue is equidistantly provided with a support beam, the support beam divides the cross section of the flue into a plurality of mixer unit zones, the mixer unit zones comprises a mixer unit, the mixer unit comprises a group of trapezoidal plates, a group of nozzles, the support beam and support rods, the bottom edges of the trapezoidal plates are connected with the support beam, one ends of the support rods are fixed on the trapezoidal plates, the other ends of the support rods are fixed on the inner wall of the flue in order to form a certain angle between the support rods and flue gas, each of the nozzles is arranged between adjacent trapezoidal plates, and the nozzles of the group share a gas supply pipeline. The mixer makes a reducing agent to reach a catalyst upper layer and to be uniformly distributed, so the ammonia escape rate of ammonia at an SCR outlet is reduced, and the denitration efficiency is improved, thereby problems of insufficient reconstruction space and insufficient ammonia mixing distance of service sets in a power plant are effectively solved.

Description

technical field [0001] The invention relates to the field of flue gas denitrification of power plant boilers, in particular to a tangential double vortex SCR mixer. Background technique [0002] In recent years, the emission standards of air pollutants have become increasingly stringent. In terms of thermal power plants, the country requires the transformation of active units without denitrification equipment, that is, to install SCR systems between the economizer and the air preheater. Due to the limitations of the renovation space and site, the renovation will cause insufficient mixing distance between the flue gas and the reducing agent, making the upper layer of the catalyst NH 3 / NO x Uneven distribution. The concentration field in the upper layer of the catalyst is an important indicator for assessing the design of the SCR flue. If the uniformity of the concentration field does not meet the standard, the NH 3 / NO x Where it is too high, the escape rate of ammonia w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/90B01D53/56B01F5/04
Inventor 司风琪喻聪桂汉生王传奇
Owner SOUTHEAST UNIV
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