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Device and method for graded ammonia injection flue gas denitrification

A denitrification and flue gas technology, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve problems such as difficult implementation, and achieve the effects of easy implementation, weakened influence, and reduced relative deviation

Inactive Publication Date: 2016-11-30
HUADIAN ELECTRIC POWER SCI INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Engineering technology is relatively easy to achieve a deviation control of about 4% to 10%, but it is more difficult to achieve an ammonia-nitrogen ratio deviation within 4%.

Method used

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  • Device and method for graded ammonia injection flue gas denitrification

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Experimental program
Comparison scheme
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Embodiment 1

[0038] Embodiment 1: as figure 1 As shown, a graded ammonia injection flue gas denitrification device is connected with the tail flue of the boiler, including: a furnace 1; an economizer 2 located at the tail of the furnace 1; a first-stage ammonia injection grid 3, and a first-stage catalyst layer 4 and the first-stage mixer 5 are installed in the outlet of the economizer 2, the first-stage catalyst layer 4 is placed under the first-stage ammonia injection grid 3, and the first-stage mixer 5 is placed behind the first-stage catalyst layer 4 , which is located at the exit of the economizer 2, the first-stage ammonia injection grille 3 is a linear control type; then it is connected to the SCR lower corner deflector 13, the second-stage ammonia injection grille 8, and the second-stage mixer 7 in sequence and SCR upper corner flue 6, the second-stage mixer 7 is located behind the nozzle of the second-stage ammonia injection grille 8, the second-stage ammonia injection grille 8 is...

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Abstract

The invention provides a device and method for graded ammonia injection flue gas denitrification. The device comprises a primary ammonia injection grille, a primary catalyst layer, a primary mixer, a secondary mixer, a secondary ammonia injection grille, a rectifier, a secondary first catalyst layer, a secondary second catalyst layer, a secondary standby catalyst layer, a primary control valve, a secondary control valve and a reducing agent flow control main valve. The device is connected with a boiler tail flue, two-stage denitrification devices are arranged, and high denitrification efficiency and low ammonia escape amount can be achieved under existing technical conditions.

Description

technical field [0001] The invention relates to a system for treating flue gas pollution of a motor unit, in particular to a device and method for denitrating flue gas by graded ammonia spraying. Background technique [0002] With the improvement of national NOx control standards for air pollutants in coal-fired power plants, most of the active units have undergone denitrification transformation. Among the many denitrification methods, the Selective Catalytic Reduction (SCR) flue gas denitrification technology has high denitrification efficiency. , The mature technology has become the preferred technology for the denitrification transformation of large thermal power units. The mechanism of SCR denitrification is: Nitrogen oxide (NOx) is mixed with reducing agent (NH3) and converted into harmless nitrogen and water under the catalysis of the catalyst. Usually, the denitrification efficiency of SCR is between 85% and 95%, and the further improvement of SCR denitrification eff...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/90B01D53/56
CPCB01D53/8631B01D53/869B01D53/90B01D2251/2062B01D2258/0283
Inventor 赵大周郑文广何胜
Owner HUADIAN ELECTRIC POWER SCI INST CO LTD
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