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Triangular multi-channel SCR static mixer

A static mixer and triangular technology, applied in the field of SCR denitrification, can solve problems such as performance improvement, achieve the effect of reducing unit load and improving adaptability to variable working conditions

Pending Publication Date: 2021-04-30
SUZHOU XIRE ENERGY SAVING ENVIRONMENTAL PROTECTION TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the limitation of the inlet and outlet structure of the device, the relative standard deviation of the NOx concentration distribution at the inlet of the ammonia injection grid can only be reduced by 20% to 40%, and the performance still needs to be further improved

Method used

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  • Triangular multi-channel SCR static mixer
  • Triangular multi-channel SCR static mixer
  • Triangular multi-channel SCR static mixer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0039] Using the triangular multi-channel SCR static mixer of this embodiment, the SCR denitrification device of a 660MW coal-fired power generation unit was optimally designed and modified for the inlet flow field. The triangular multi-channel SCR static mixer has a width of 16.2m, a length of 8.5m, and a height of 3.2m. There are 14 deflectors 2 at the entrance, 3 layers of triangular partitions 10 in the height direction, and 4 baffles with an included angle of 60° on both sides. The distance between the corner plate 11 and the partition plate 10 is 0.8m, and 42 trapezoidal flow-around sheets 14 are arranged on each layer of partition plate 10 .

[0040] The CFD simulation results show that after installing the triangular multi-channel static mixer, the relative standard deviation (CV value) of the NOx concentration distribution at the AIG inlet is reduced from 17.5% to 6.6%, with a drop rate of 62%. Figure 4 , 5 shown.

[0041] This example shows that the triangular mul...

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Abstract

The invention relates to a triangular multi-channel SCR static mixer, which comprises a mixer body and a flow guide plate, the mixer body comprises a triangular partition plate, an angle plate and an inlet connecting piece, the partition plate is arranged up and down to form a flue gas channel, and a first flue gas inlet, a second flue gas inlet and a flue gas outlet are formed in the three sides of the triangular partition plate and located on one side of the first flue gas inlet and one side of the second flue gas inlet; the first / second flue gas inlets of the odd-numbered layers / even-numbered layers on the side are sealed by the angle plates; wherein the guide plate is arranged at the upstream of the flue gas inlet, the inlet connecting piece is arranged in the flue gas channel at the junction of the first flue gas inlet and the second flue gas inlet, and the inlet connecting piece is in a triangular cone shape and connects the angle plates on the two sides. According to the invention, the relative standard deviation reduction amplitude of NOx concentration distribution at the inlet of the ammonia injection grid can reach 60% or above, the influence of unit load, grinding combination and combustion adjustment on NOx concentration distribution at the SCR inlet is greatly reduced, and the variable working condition adaptability of the SCR denitration device is fundamentally improved.

Description

technical field [0001] The invention relates to the technical field of SCR denitrification, in particular to a triangular multi-channel SCR static mixer. Background technique [0002] Under the current situation of ultra-low NOx emissions, NOx emissions from coal-fired power plants should be reduced to 50mg / m 3 Below, the SCR denitrification efficiency needs to be increased to about 90%. In order to control the ammonia escape concentration and ensure the safe operation of the unit, it is not only necessary to add a sufficient volume of catalyst, but also to increase the NH concentration at the top catalyst inlet of the SCR reactor. 3 The uniformity of / NO molar ratio distribution also puts forward higher requirements. The NOx concentration and distribution at the SCR inlet are directly related to the combustion conditions in the furnace. Changes in furnace combustion conditions brought about by unit load, mill combination changes, and combustion adjustments will all lead ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/56B01F5/06
CPCB01D53/8628B01D2258/0283B01F25/42
Inventor 谢新华周健韦振祖卢承政宋玉宝赵俊武杨恂
Owner SUZHOU XIRE ENERGY SAVING ENVIRONMENTAL PROTECTION TECH CO LTD
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