Flue partition mixer

Abstract

The invention discloses a flue partition mixer. The cross section of a flue is divided into a plurality of partitions; each partition is internally provided with a bias flow blade group; bias flow blades in the bias flow blade groups deflect along the same rotation direction; the center lines of the bias flow blades in the bias flow blade groups are tangent to the same circle; the rotating deflection directions of all the bias flow blades in the bias flow blade groups in the adjacent partitions are opposite; the mixer can achieve uniform mixing of smoke in all the partitions; and the number of the partitions is small, so that the investment cost is low.

Description

technical field [0001] The invention belongs to the field of flue gas mixing treatment, and relates to a flue partition mixer. Background technique [0002] Flue gas mixing is an important step to improve flue gas treatment, especially in the SCR system. The existing ammonia injection and mixing technology of the conventional SCR system adopts the installation of ammonia injection in the entire flue section, which can manually adjust the amount of ammonia sprayed in each zone. grille, and then use 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 downside of this approach is that. [0003] 1. The NOx distribution at the SCR inlet often has a large deviation due to the difference in combustio...

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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 amount of reductant injected into each zone is fixed. When the NOx distribution at the inlet changes greatly, the reductant and NOx mixing will be difficult to meet the requirements;

[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

[0006] The traditional partitioned dynamic ammonia injection technology is to arrange a large number of flue gas component measuring points at the SCR outlet, and change the manual valve of the ammonia injection grille to an automatic regulating valve. The disadvantage of this method is that there is no mixing measure with a large cross-section The large number of partitions leads to a large number of flue gas composition measuring points and regulating valves. Not only is the investment cost high, but the measurement cycle is long, the response time is long, and the adjustment quality is poor. Therefore, it is necessary to design a new type of flue gas mixer and method. , to achieve uniform mixing of components in the flue gas, while reducing investment costs, while reducing the number of partitions

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