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Granular-bed gas filtering device and filtering dust removing method thereof

A filter device, filter dust removal technology, applied in the direction of dispersed particle filtration, separation methods, chemical instruments and methods, etc., can solve the problem of incompatibility between high efficiency and low pressure drop, short dust filtration time of dust filter membrane, and fine dust filtration efficiency The problem of not being high enough to achieve the effect of increasing the dust holding capacity of the bed, reducing the back-blowing gas velocity and back-blowing gas flow rate, and reducing energy consumption

Inactive Publication Date: 2011-04-20
NINGBO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, in the particle bed gas filtration device, the particle size of the particle layer used for gas filtration and dust removal is generally greater than 1mm, and the filtration efficiency of inhalable dust, especially fine dust, is not high
Therefore, in order to improve the filtration efficiency of the filter device for fine dust, a Chinese invention patent specification with the application date of November 22, 2004, whose patent number is ZL200410084485.3, discloses a particle bed gas purification device and its method, including a shell 1. The air distributor installed in the shell and the granular bed above the air distributor are characterized in that the granular bed is composed of at least two layers of filter materials, and the particle size of each layer of filter material decreases layer by layer from top to bottom, while The particle density of each layer of filter material increases layer by layer from top to bottom. When using this device to remove dust, the upper layer of filter material performs coarse dust removal, and the bottom layer of filter material performs fine dust removal. The materials are normally fluidized and do not mix with each other. It integrates coarse and fine filtration, which solves the problem that the high efficiency and low pressure drop of the single-layer filter material particle bed cannot be achieved at the same time; The filter load of a very large part of the dust makes it possible for the bottom layer of filter material to use fine filter material to obtain a dust filter film on its surface to improve the filtration efficiency of fine dust. , Periodic changes from maturity to extinction, the dust filter membrane takes a short time to filter dust, and the average filtration efficiency of fine dust in a filtration-cleaning cycle is still not high enough

Method used

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  • Granular-bed gas filtering device and filtering dust removing method thereof
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  • Granular-bed gas filtering device and filtering dust removing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment one: if figure 1 As shown, a particle bed gas filter device includes a casing 1 and an air distribution device 2 arranged in the casing 1. A particle layer 3 is laid on the air distribution device 2. The particles in the particle layer 3 have a particle size of 0.3 to 0.5 mm of quartz sand, the thickness of the granular layer 3 is 35mm, the granular layer 3 is laid with a powder layer 4, the powder of the powder layer 4 is quartz powder of 150-200 mesh, and the thickness of the powder layer 4 is 8mm.

[0047] Utilize the filter device of embodiment one to carry out filter dust removal, concrete method is:

[0048] (1) The dust-containing gas is introduced from the dust-containing gas inlet of the shell 1, filtered through the powder layer 4 and the particle layer 3 from top to bottom, and then drawn out of the shell from the clean gas outlet of the shell 1;

[0049] (2) After filtering for a period of time, when cleaning dust, feed back blowing gas from the ...

Embodiment 2

[0057] Embodiment 2: Other structures are the same as Embodiment 1, except that the powder in the powder layer 4 is 200-250 mesh quartz powder.

[0058] Utilize the filter device of embodiment two to carry out filter dust removal, concrete method is:

[0059] (1) The dust-containing gas is introduced from the dust-containing gas inlet of the shell 1, filtered from the powder layer 4 and the particle layer 3 from top to bottom, and then drawn out of the shell 1 from the clean gas outlet of the shell 1;

[0060] (2) After filtering for a period of time, when cleaning dust, feed the back blowing gas from the back blowing gas inlet of the shell 1, and set the gas velocity of the back blowing gas to 0.08-0.13m / s, and the back blowing gas comes from the bottom While flowing upward through the air distribution device 2, the particle layer 3 and the powder layer 4, the powder layer 4 is in a fluidized state under the action of the back-blowing air while the particle layer 3 is station...

Embodiment 3

[0064] Embodiment 3: A particle bed gas filter device, including a housing 1 and an air distribution device 2 arranged in the housing 1, the air distribution device 2 is covered with a particle layer 3, and the particles in the particle layer 3 have a particle size of 0.5- 0.8mm quartz sand, the thickness of the granular layer 3 is 50mm, the granular layer 3 is laid with a powder layer 4, the powder of the powder layer 4 is quartz powder of 150-200 mesh, and the thickness of the powder layer 4 is 15mm.

[0065] Utilize the filter device of embodiment three to carry out filter dust removal, concrete method is:

[0066] (1) The dust-containing gas is introduced from the dust-containing gas inlet of the shell 1, filtered from the powder layer 4 and the particle layer 3 from top to bottom, and then drawn out of the shell 1 from the clean gas outlet of the shell 1;

[0067] (2) After filtering for a period of time, when cleaning dust, feed back blowing gas from the back blowing gas...

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Abstract

The invention discloses a granular-bed gas filtering device comprising a casing and an air distribution device arranged in the casing. The granular-bed gas filtering device is characterized in that a granular layer is paved on the air distribution device; the grain diameter of the granular layer is 0.25-1mm; the thickness of the granular layer is 20-75mm; a powder body is paved on the granular layer; the powder grain diameter of the powder layer is 100-300mm; and the thickness of the powder layer is 0.5-25mm. The invention has the advantages that: the powder layer is paved on the granular layer, i.e. a powder layer filter film is additionally arranged on the surface of the granular layer and different from a dust filter film formed in the filtering process; firstly, the filter film is gradually formed in the filtering process and disappears after removing dust, and the filter film of the powder layer always exists during filtering and does not disappear after removing dust; and secondly, the characteristics of the dust filter film is decided by the characteristics of the dust to be filtered, and the characteristics and the thickness of the filter film of the powder layer can be optimally designed by selecting the powder body and the thickness of the powder layer according to the actual condition, therefore, with the filter film of the powder layer, a layer of surface filter film always exists on the surface of the granular layer so as to filter dust by powder and obtain extremely-high filter efficiency.

Description

technical field [0001] The invention relates to a treatment device for dust-containing gas, in particular to a particle bed gas filter device and a filter and dust removal method thereof. Background technique [0002] At present, in the particle bed gas filter device, the particle size of the particle layer used for gas filtration and dust removal is generally greater than 1 mm, and the filtration efficiency of inhalable dust, especially fine dust, is not high. Therefore, in order to improve the filtration efficiency of the filter device for fine dust, a Chinese invention patent specification with the application date of November 22, 2004, whose patent number is ZL200410084485.3, discloses a particle bed gas purification device and its method, including a shell 1. The air distributor installed in the shell and the granular bed above the air distributor are characterized in that the granular bed is composed of at least two layers of filter materials, and the particle size of...

Claims

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Application Information

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IPC IPC(8): B01D46/30B01D46/42
Inventor 杨国华
Owner NINGBO UNIV
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