Spin exchange coupling based uniform distribution device for flue gas, equipment equipped with device and working method

Abstract

The invention relates to a spin exchange coupling based uniform distribution device for flue gas, equipment equipped with the device and a working method. The device comprises a flat plate and a plurality of circular through-flow holes, wherein all the circular through-flow holes are formed in the flat plate, a guide vane group is arranged at each circular through-flow hole and comprises a plurality of guide vanes, the guide vanes at the same circular through-flow hole are arranged in a clockwise or counterclockwise swirling mode, and an imaginary circle is arranged at the center of each circular through-flow hole and is in a hole shape; one end of each guide vane is arranged at the edge of the circular through-flow hole where the guide vane is located, and the other end is arranged at theedge of each imaginary circle of the circular through-flow hole where the guide vane is located. By means of the spin exchange coupling based coupling uniform distribution device, flue gas entering an SCR (selective catalytic reduction) denitration reactor is redistributed, uniformity of the flue gas in the SCR denitration reactor can be obviously improved, erosive wear of a catalyst by high fluegas flow rate and the ash deposition condition of the catalyst in a low flue gas flow rate area are effectively improved, and the service life of the catalyst is prolonged.

Description

technical field [0001] The invention relates to a flue gas swirl sink coupling uniform distribution device, equipment and working method for installing the device. Background technique [0002] At present, the SCR flue gas denitrification process is adopted by most coal-fired generating units in my country because of its simple structure, high denitrification efficiency, and the by-products produced during the denitrification process will not cause secondary pollution. However, due to the complex and changeable flue gas flow field at the reactor inlet of the SCR denitrification device, the NO X The concentration distribution is uneven, and the relative deviation of the local ammonia nitrogen molar ratio of the flue gas entering the reactor is relatively large, resulting in low denitrification efficiency. Especially in the context of ultra-low emission transformation, denitrification export NO X Concentration control 50mg / m 3 Even lower, reducing agent consumption and ammo...

AI Technical Summary

Problems solved by technology

However, due to the complex and changeable flue gas flow field at the reactor inlet of the SCR denitrification device, the NO X The concentration distribution is uneven, and the relative deviation of the local ammonia nitrogen molar ratio of the flue gas entering the reactor is relatively large, resulting in low denitrification efficiency

Especially in the context of ultra-low emission transformation, denitrification export NO X Concentration control 50mg / m 3 Even lower, reducing agent consumption and ammonia slip consumption cannot be effectively guaranteed

At the same time, due to the limited effect of the reactor inlet deflector, the flue gas flow rate into the uppermost catalyst has a large deviation, and the local flue gas flow rate is too large, causing the wear of the catalyst, and the area where the flue gas flow rate is too low will appear. deposition, which seriously causes catalyst clogging, which further aggravates catalyst deactivation

[0003] Due to its structural characteristics, the existing SCR denitrification system air distribution device has disadvantages such as long mixing time and poor mixing effect

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