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Method and system for improving comprehensive performance of coal-fired power plant boiler SCR system

A technology of SCR system and coal-fired power station, which is applied in separation methods, chemical instruments and methods, and separation of dispersed particles. It can solve the problems of increased ammonia escape and large amount of ammonia injection, and achieve the effect of improving comprehensive performance.

Active Publication Date: 2021-02-19
ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above technologies can effectively improve the overall performance of the SCR denitrification system when the overall activity of the catalyst in the SCR system is good and the activity of each area is basically the same. However, once the local catalyst is deactivated, serious negative effects may occur, namely Corresponding to the catalyst deactivation area, there will be too much ammonia injection (in order to reduce the NOx in this area), and the ammonia slip will increase rapidly

Method used

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  • Method and system for improving comprehensive performance of coal-fired power plant boiler SCR system
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  • Method and system for improving comprehensive performance of coal-fired power plant boiler SCR system

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Embodiment 1

[0047] This embodiment provides a method for improving the overall performance of the SCR system of a coal-fired power plant boiler, such as figure 1 shown, including the following steps:

[0048] 1) Obtain the NOx distribution deviation coefficient of the flue section after the denitration catalyst layer:

[0049] According to the distribution of upstream ammonia injection grids (assumed to be M×N, M is the number of ammonia injection branch pipes in the width direction of the flue, N is the number of ammonia injection branch pipes in the depth direction of the flue), divide the flue behind the denitrification catalyst layer It is M×N areas, and the NOx and O in each area are measured by the flue gas analysis device 2 ; The NOx distribution deviation coefficient Cv is obtained by calculation. If the deviation is less than 20%, the system does not operate, and if the deviation coefficient>20%, proceed to the next step.

[0050] The formula for calculating the NOx concentrat...

Embodiment 2

[0080] This embodiment provides a system for improving the comprehensive performance of the SCR system of a coal-fired power plant boiler, which includes a flue 13, an ammonia injection grid arranged in the flue 13, an adjustable deflector device, a flue gas flow rate measuring device 6, and a flue gas flow rate measuring device 6. Gas composition measuring device 7, intelligent control module; the opening and closing angle of the adjustable deflector device and the ammonia injection amount of the ammonia injection grid are controlled by the intelligent control module. Wherein, the adjustable deflector device includes a straight flue combined deflector 4 , a curved combined deflector 9 and its baffle actuator 5 .

[0081] Such as figure 1As shown, the flue 13 is provided with a first bend 1, a second bend 2, and a third bend 3 from the smoke inlet end, between the second bend 2 and the first bend 1, and the third bend 3 They are respectively connected through straight flue. ...

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Abstract

The invention discloses a method and system for improving the comprehensive performance of a coal-fired power plant boiler SCR system. According to the technical schemes, the method comprises the steps that: the NOx distribution deviation coefficient of the section of a flue behind a denitration catalyst layer is obtained; the ammonia spraying amount of ammonia spraying branch pipes is dynamicallyadjusted; whether the activity of a regional catalyst is reduced or inactivated is judged; the ammonia spraying amount and a flue gas amount are roughly distributed; and the ammonia spraying amount and the flue gas amount are finely adjusted. According to the method and system, the flue gas amount redistribution mode is adopted in all areas of the section of the flue, the catalyst area with goodactivity is fully utilized, the catalyst area with poor activity or inactivation is avoided, and the comprehensive performance of an SCR denitration device is improved.

Description

technical field [0001] The invention relates to the technical field of coal-fired boilers in thermal power plants, in particular to a method and system for improving the comprehensive performance of the SCR system of coal-fired power plant boilers. Background technique [0002] At this stage, SCR denitrification technology is the main way to remove NOx in flue gas of coal-fired power plant boilers in my country. The principle of SCR denitrification is to inject a certain amount of ammonia gas (NH 3 ), at a certain temperature (300-400°C) and under the action of a catalyst, ammonia gas and nitrogen oxides (NOx) in the flue gas undergo a reduction reaction, and NOx is reduced to N 2 , so as to achieve the removal of nitrogen oxides. The performance indicators of the SCR denitrification system generally include: denitrification efficiency, ammonia escape rate, system resistance, etc. If the ammonia escape is too high, it will cause the blockage of the downstream air preheater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/86B01D53/56
CPCB01D53/8631B01D53/8696
Inventor 张利孟董信光侯凡军赵中华刘景龙张绪辉刘科王海超崔福兴杨兴森
Owner ELECTRIC POWER RESEARCH INSTITUTE OF STATE GRID SHANDONG ELECTRIC POWER COMPANY
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