Denitration inlet flue full-section flue gas mixer and method

Abstract

The invention discloses a denitration inlet flue full-section flue gas mixer and method. The device comprises a plurality of layers of deflectors which are arranged on the cross section of a denitration inlet flue and are sequentially arranged along the height direction of the denitration inlet flue, the deflectors deflect leftwards or rightwards, so that flue gas of different layers is forcibly mixed in a cross contact mode in the full section of the flue, and the mixer and the method can improve the uniformity of concentration distribution of all flue gas components in the full section of the denitration inlet flue.

Description

technical field [0001] The invention belongs to the technical field of flue gas mixing, and relates to a full-section flue gas mixer and a method of a denitrification inlet flue. Background technique [0002] The ammonia injection and mixing technology of the existing conventional SCR system adopts the installation of ammonia injection grids in the entire flue section that can manually adjust the amount of ammonia injection in each zone, and then uses a static mixer to promote the mixing of ammonia and flue gas. This method requires that the NOx distribution at the SCR inlet is relatively uniform and stable, and the opening of each manual control valve is adjusted according to the NOx distribution at the SCR inlet to control the amount of reducing agent injected into each zone. The disadvantages of this approach are: [0003] 1) The distribution of NOx at the SCR inlet will often have a large deviation due to the difference in combustion conditions under different working c...

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Problems solved by technology

[0003] 1) The distribution of NOx at the SCR inlet will often have a large deviation due to the difference in combustion conditions under different working conditions, and the distribution law will also be unstable;

[0004] 2) After the opening of each manual control valve of the ammonia injection grid is optimized and adjusted for ammonia injection under a certain working condition, the proportion of reductant injection in each zone is fixed. When the NOx distribution at the inlet changes greatly, the reductant The matching with NOx is difficult to meet the requirements, which leads to local ammonia overspray or underspray;

[0005] 3) With the promulgation and implementation of ultra-low emission environmental protection regulations, conventional SCR is more sensitive to the deviation of inlet NOx distribution, which is more likely to cause local excess ammonia to escape, and threaten the safe and reliable operation of subsequent equipment

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