Granular bed filtering dust removal system

Abstract

The invention discloses a granular bed filtering dust removal system. The granular bed filtering dust removal system comprises at least one main granular bed filtering dust collector and a secondary granular bed filtering dust collector, a dust-containing air main pipe, a clean air main pipe and a blowback air main pipe, wherein the dust-containing air main pipe conveys dust-containing air into the main granular bed filtering dust collector, the clean air main pipe outputs clean air filtered by the main granular bed filtering dust collector, the bottom of the main granular bed filtering dust collector is provided with a main ash hopper, the blowback air main pipe conveys blowback air into the main granular bed filtering dust collector, the secondary granular bed filtering dust collector is provided with a dust-containing air introduction pipe used forcommunicating the secondary granular bed filtering dust collector with the upper portion of the main ash hopper, the dust-containing air introduction pipe conveys powder-containing air into the secondary granular bed filtering dust collector, the clean air main pipe outputs clean air filtered by the secondary granular bed filtering dust collector, the blowback air main pipe conveys blowback air into the secondary granular bed filtering dust collector, and the bottom of the secondary granular bed filtering dust collector is provided with a secondary ash hopper. The granular bed filtering dust removal system has the advantage that the fine dust that is difficult to settle can be efficiently and reliably removed.

Description

technical field [0001] The invention relates to a filter and dust removal system, in particular to a particle bed filter and dust removal system. Background technique [0002] The particle bed filter dust removal system has unique advantages in the field of high temperature gas dust removal. [0003] For example, the invention patent "a granular bed filter dust collector" announced by China (the application date is January 31, 2007, the announcement number is CN101036846A, and the patent number is ZL200710067109.7), which includes an outer shell and a shell set along the height direction There is at least one layer of filtering device in the body. The upper part of the outer casing is provided with a dust-containing gas inlet, and the lower end of the outer casing is provided with a dust outlet. The filtering device is equipped with an independent gas reversing device, which is connected to a clean gas main pipe and The back blowing air main pipe is characterized in that th...

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Problems solved by technology

[0004] But, there is following problem in above-mentioned granule bed filter deduster in implementation process: because the granule layer in an inner housing back-blowing gas flow rate is 1.5~ of the average filter gas flow rate of the granule layer in this inner housing 2.5 times, so the blowback gas of the particle layer in the inner shell of the lowest second layer cannot be accepted by the particle layer in the inner shell of the lowest first layer, which will cause the blowback gas to carry the dust upwards, and the particles The blowback gas of the particle layer in the inner casing of the lowest first layer of the bed filter dust collector can only flow upwards, causing the fine dust to swirl between the lowest first layer to the lowest third layer, affecting the fine dust settlement and discharge

In order to make the blowback gas flow downward, although a circulating fan can be used to extract air from the lower part of the particle bed filter dust collector to force the backwash gas and dust to be drawn from the lower part and circulate back to the dusty gas inlet of the particle bed filter dust collector, but when When the temperature is high and the dust hardness is high, the blades in the circulating fan will wear seriously, especially when the gas contains a lot of tar, the anti-tar and dust accumulation in the circulating fan is a problem

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