Device and method for pre-removing coarse particle ash in front of SCR denitration device

Abstract

The invention discloses a device and method for pre-removing coarse particle ash in front of an SCR denitration device. The device comprises an economizer outlet flue, an economizer ash hopper, a plurality of baffle plates, a plurality of ash collecting hoppers and a plurality of ash falling pipes. A flue gas inlet is formed in the top of the economizer outlet flue, the baffle plates are sequentially distributed in the economizer outlet flue, the baffle plate on the outermost side is fixed on the outer wall of the economizer outlet flue, the baffle plate on the outermost side is obliquely distributed, the other baffle plates are of herringbone structures or other structural forms capable of enriching dust and guiding the dust into the dust collecting hoppers, a gap is formed between everytwo adjacent baffle plates, wherein one gap corresponds to one ash collecting hopper and one ash falling pipe, the ash collecting hopper is located below the corresponding gap, a bottom outlet of theash collecting hopper is communicated with the upper end of the corresponding ash falling pipe, and the lower ends of the ash falling pipes penetrate through the side wall of the economizer outlet flue to be inserted into the economizer ash hopper. The device and the method can effectively improve the ash collecting effect of the economizer flue.

Description

technical field [0001] The invention belongs to the field of dust removal, and relates to a device and method for pre-removing coarse particle dust before an SCR denitrification device. Background technique [0002] Due to the coal quality and combustion system, many coal-fired boilers have relatively coarse dust particles. The ash particles with a particle size of more than 200 μm account for a relatively large proportion, and there are even particles with a particle size as high as 1000-2000 μm. These particles will cause serious wear and tear to the subsequent flue and catalyst. The design of conventional economizer flue and ash hopper can only collect about 5% of the total ash, and most of the ash will still enter the follow-up flue and equipment. Contents of the invention [0003] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, and provide a device and method for pre-removing coarse particle ash before the SCR d...

AI Technical Summary

Problems solved by technology

Conventional economizer flue and ash hopper design, which can only collect about 5% of the total ash, most of the ash will still enter the follow-up flue and equipment

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