A particle bed filter and dust removal system

Abstract

The invention discloses a particle bed filtering and dust removal system, which comprises at least one primary particle bed filtering dust collector and secondary particle bed filtering dust collector, a dust-containing gas main pipe, a clean gas main pipe and a backflushing gas main pipe. The dust-containing gas main pipe is directed to the main pipe. The dust-laden gas is transported in the particle bed filter dust collector, and the clean gas main pipe outputs the clean gas filtered by the main particle bed filter dust collector. There is a main ash hopper at the bottom of the main particle bed filter dust collector, and the backflushing gas main pipe is filtered to the main particle bed. The backflushing gas is transported in the dust collector. The secondary particle bed filter dust collector is provided with a dust-laden gas introduction pipe that connects it with the upper part of the main ash hopper. The dust-laden gas introduction pipe transports fine dust-containing gas to the secondary particle bed filter dust collector. , the clean gas main pipe outputs the clean gas filtered by the secondary particle bed filter dust collector, and the backflushing gas main pipe conveys the backflushing gas to the secondary particle bed filter dust collector. The bottom of the secondary particle bed filter dust collector is provided with a secondary ash hopper; It can efficiently and reliably remove fine dust that is difficult to settle.

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 particle bed filter dust collector" announced in China (the application date is January 31, 2007, the announcement number is CN101036846A, the patent number is ZL200710067109.7), which includes an outer casing and a height direction arranged on the outer casing. There is at least one layer of filter device in the body, the upper part of the outer body is provided with a dust-containing gas inlet, the lower end of the outer body is provided with a dust outlet, the filter device is provided with an independent gas reversing device, and the gas reversing device is connected with a clean gas main pipe and The back-flushing gas main pipe is chara...

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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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