Device and method for pre-removing popcorn ash of SCR denitration system

Abstract

The invention discloses a device for pre-removing popcorn ash of an SCR denitration system. The device comprises a vertical shaft flue, a horizontal flue and an uptake shaft which are connected in sequence, wherein the turning connection positions between the horizontal flue and the vertical shaft flue and the uptake shaft respectively have streamline appearances, an ash hopper is arranged on the lower side of a base plate of the horizontal flue, and a catcher, a separator and a filter screen are sequentially arranged on the side in the smoke flowing direction. A smoke circulating port is formed in a base plate of the tail portion of the horizontal flue and is communicated with the ash hopper. The invention further provides a method for pre-removing popcorn ash of the SCR denitration system. The flinging wall characteristics at the connection positions of the streamline vertical shaft flue and the horizontal flue which are installed without guiding plates are utilized to form a high-ash-concentration flue airflow, and popcorn ash and smoke are efficiently separated by sequentially adopting the catcher, the separator and the filter screen based on streaming impact type separation, gravity settling separation and intercepting separation principles. Rapid and effective separation of high-temperature and high-concentration popcorn ash is achieved by adopting the method, and the device has the advantages of being simple in structure and safe and stable in operation.

Description

technical field [0001] The invention relates to a method and a device for pre-removing popcorn ash in an SCR denitrification system, belonging to the technical field of air pollutant control. Background technique [0002] Popcorn ash is a kind of large-grained ash formed on the surface of the heating surface of the boiler, usually with a size of 10mm or more. In addition, this ash also has the characteristics of low density, loose porous and irregular shape. Therefore, in the SCR denitrification system, once the popcorn ash enters the catalyst layer, it will inevitably wear the catalyst surface, reduce the catalyst activity, and sometimes even block the catalyst pores, thereby aggravating the wear of the catalyst on the unblocked side and making the denitrification function of the SCR system quickly invalid. [0003] In order to prevent the clogging of popcorn ash, it is necessary to pre-deash the flue gas entering the catalyst layer. At present, the general practice in dev...

AI Technical Summary

Problems solved by technology

[0005] Purpose of the invention: The present invention aims at the outstanding problems of catalyst clogging and serious wear caused by popcorn ash in the SCR denitrification system, and provides a device and method for pre-removing popcorn ash in the SCR denitrification system, which is used for denitrification before separating into the catalyst layer popcorn ash in smoke

Images