Improved structure of clean gas chamber of cloth bag dust collector

Abstract

The utility model discloses an improved structure of cloth bag dust collector clean gas chamber, it includes cloth bag dust removal area, cloth bag flower board, dust collector clean gas chamber and arc deflector. The dust collector clean gas chamber will four side angle square structure improve setting arc deflector, optimize air current distribution, and effectively prevent and control the dew condensation corrosion of dust collector clean gas chamber corner area. The utility model has the advantages of simple structure, and the effect of preventing dew condensation corrosion is remarkable.

Description

Technical Field

[0001] This utility model belongs to the field of flue gas purification technology and relates to an improved structure of the clean air chamber of a bag filter, which is suitable for preventing condensation corrosion in the clean air chamber in semi-dry desulfurization technology. Background Technology

[0002] Circulating fluidized bed semi-dry desulfurization technology is widely used in the steel and waste incineration industries due to its advantages such as system simplicity and low operating costs. However, in actual operation, condensation corrosion often occurs in the corner areas of the dust collector's clean air chamber due to structural design defects. Specifically, when clean flue gas enters the square clean air chamber through the bag filter plate area, the flow area changes, and dead zones easily form at the four vertical corners, causing flue gas stagnation. At the same time, the corner areas have a large contact area with the outside cold air, which can easily lead to a rapid drop in local temperature. When the flue gas temperature is lower than the dew point temperature, condensation corrosion occurs, which can lead to excessive dust and equipment damage in severe cases.

[0003] In existing technologies, condensation problems are typically alleviated by adding insulation layers or increasing flue gas temperature, but these methods cannot completely eliminate the temperature unevenness caused by dead zones in the flow at the edges and corners. Therefore, there is an urgent need for a structural improvement scheme that can optimize airflow distribution and reduce heat exchange area, thereby effectively preventing condensation and corrosion in the edge and corner areas. Summary of the Invention

[0004] This utility model discloses an improved structure for the clean air chamber of a bag filter, applicable to the prevention and control of condensation corrosion in the corner areas of the clean air chamber in semi-dry desulfurization technology. The structure includes a bag filter area (1), a bag filter tube sheet (2), a clean air chamber (3), and four corner arc-shaped guide plates (4). The specific layout of each component is as follows:

[0005] The bag filter dust collection zone (1) consists of multiple sets of slender filter bags suspended vertically. The upper ends are fixed to the elliptical holes of the filter bag tube sheet (2) by welding or flanges to form a sealed connection. The filter bag tube sheet (2) is a horizontally arranged steel plate with multiple elliptical through holes evenly opened on its surface. The hole diameter matches the outer diameter of the filter bag and is used to fix the filter bag and separate the lower bag filter dust collection zone (1) from the upper dust collector clean air chamber (3). The radius of the arc of the arc-shaped guide plate (4) is not less than 200mm.

[0006] The flue gas flow path is as follows: Dust-laden flue gas enters from the bottom of the bag filter area (1), permeates from the outside of the bag to the inside, and the dust is trapped on the outer surface due to the selective permeability of the bag. The clean flue gas penetrates the filter material and enters the inside of the bag. The clean flue gas flows upward from the inside of the bag and enters the clean air chamber (3) of the dust collector above through the circular holes of the bag tube sheet (2). The clean air chamber (3) of the dust collector is a square structure with arc-shaped guide plates (4) welded at its four vertical corners. The arc surface of the arc-shaped guide plate (4) extends towards the center of the clean air chamber (3) of the dust collector, and its height is flush with the side wall of the clean air chamber. The radius of curvature of the arc-shaped guide plate (4) matches the circular bag arrangement area on the bag tube sheet (2), forming a continuous flow channel from the circular bag arrangement area to the square clean air chamber (3) of the dust collector. The clean flue gas generated by multiple bag filter systems converges in the clean air chamber and is then transported to the subsequent desulfurization system through the top outlet.

[0007] This utility model discloses an improved structure for the clean air chamber of a bag filter, which avoids corner eddies when flue gas flows, reduces the contact area with cold air, reduces the temperature drop in the corner area by more than 5°C, and significantly inhibits condensation corrosion. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0009] Figure 2 This is a top view of the flue gas purification chamber of this utility model.

[0010] Figure 3 This is a partial enlarged view of the corner arc-shaped guide plate of this utility model.

[0011] In the diagram: 1. Baghouse dust collection area, 2. Baghouse tube sheet, 3. Clean air chamber of the dust collector, 4. Arc-shaped baffle plate. Detailed Implementation

[0012] See Figures 1 to 3 .

[0013] This utility model discloses an improved structure for the clean air chamber of a bag filter, which is applicable to the prevention and control of condensation corrosion in the corner areas of the clean air chamber in semi-dry desulfurization technology. The structure includes a bag filter area (1), a bag filter plate (2), a clean air chamber of the dust collector (3), and four corner arc-shaped guide plates (4).

[0014] The bag filter dust collection zone (1) consists of multiple sets of slender filter bags suspended vertically. The upper ends are fixed to the elliptical holes of the filter bag tube sheet (2) by welding or flanges to form a sealed connection. The filter bag tube sheet (2) is a horizontally arranged steel plate with multiple elliptical through holes evenly opened on its surface. The hole diameter matches the outer diameter of the filter bag and is used to fix the filter bag and separate the lower bag filter dust collection zone (1) from the upper dust collector clean air chamber (3). The radius of the arc of the arc-shaped guide plate (4) is not less than 200mm.

[0015] The flue gas flow path is as follows: Dust-laden flue gas enters from the bottom of the bag filter area (1), permeates from the outside of the bag to the inside, and the dust is trapped on the outer surface due to the selective permeability of the bag. The clean flue gas penetrates the filter material and enters the inside of the bag. The clean flue gas flows upward from the inside of the bag and enters the clean air chamber (3) of the dust collector above through the circular holes of the bag tube sheet (2). The clean air chamber (3) of the dust collector is a square structure with arc-shaped guide plates (4) welded at its four vertical corners. The arc surface of the arc-shaped guide plate (4) extends towards the center of the clean air chamber (3) of the dust collector, and its height is flush with the side wall of the clean air chamber. The radius of curvature of the arc-shaped guide plate (4) matches the circular bag arrangement area on the bag tube sheet (2), forming a continuous flow channel from the circular bag arrangement area to the square clean air chamber (3) of the dust collector. The clean flue gas generated by multiple bag filter systems converges in the clean air chamber and is then transported to the subsequent desulfurization system through the top outlet.

Claims

1. An improved structure for the clean air chamber of a bag filter, comprising a bag filter area (1), a bag tube sheet (2), a clean air chamber (3), and an arc-shaped guide plate (4), characterized in that: Arc-shaped guide plates (4) are respectively installed at the four vertical corners of the clean air chamber (3) of the dust collector. The radius of curvature of the arc-shaped guide plates (4) matches the circular bag arrangement area on the bag filter plate (2), so that the flue gas forms a continuous flow path when it transitions from the circular bag arrangement area to the square clean air chamber (3) of the dust collector.

2. The improved structure of the clean air chamber of a bag filter according to claim 1, characterized in that: The radius of the arc of the arc-shaped guide plate (4) is not less than 200mm.

3. The improved structure of the clean air chamber of a bag filter according to claim 1, characterized in that: The arc-shaped guide plate (4) extends toward the center of the clean air chamber (3) of the dust collector, and its height is flush with the side wall of the clean air chamber.

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