Labyrinth type pre-dedusting electric dedusting device

Abstract

The labyrinth type pre-dedusting electric dedusting device comprises a shell, a pre-dedusting chamber and a plurality of electric fields are arranged in the shell, the electric fields are sequentially arranged behind the pre-dedusting chamber from front to back, a plurality of groove-shaped plates are arranged in the pre-dedusting chamber, the groove-shaped plates are arranged in a front row and a rear row in the pre-dedusting chamber, and the groove-shaped plates in the front row and the groove-shaped plates in the rear row are arranged in a staggered mode. The groove openings of the groove-shaped plates in the rear row face forwards, the groove openings of the groove-shaped plates in the front row face backwards, each groove-shaped plate is composed of a flat plate and a groove wall body formed by folding the two ends of the flat plate by 90 degrees in the same direction, and compared with the prior art, the dust removal efficiency and effect can be improved, and the occupied space is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of flue gas pollutant treatment and dust removal, in particular to the technical field of a labyrinth-type pre-dust removal electric precipitator. Background Art

[0002] Electrostatic precipitator has the advantages of high dust removal efficiency, wide application range, low operating cost, easy use and maintenance, and no secondary pollution. It is the mainstream equipment for domestic smoke dust control. However, when the dust concentration of the inlet flue gas is too high, a large number of smoke dust particles enter the corona zone, adsorb gas ions and wrap the corona electrode, causing the corona zone to be compressed, the ionization channel to be blocked, the corona current to drop sharply or even the corona to be closed, which seriously affects the dust removal efficiency. Adding a gravity settling chamber in front of the electrostatic precipitator electric field is a commonly used treatment method.

[0003] The gravity settling chamber has the following problems: 1. It requires a large space and occupies a large area; 2. The separation efficiency is relatively low, and it is mainly effective for large particles such as particles with a diameter >50μm, but its dust removal effect on fine particles such as PM2.5 or submicron particles is not ideal. It is also affected by multiple factors such as gas velocity and particle density, and its stability is poor; 3. If the gravity settling chamber is not designed properly, it may cause airflow turbulence, and the subsequent airflow distribution is not guaranteed, which in turn reduces the efficiency of the electrostatic precipitator. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems in the prior art and to propose a labyrinth-type pre-dust removal electrostatic precipitator that can solve at least one of the above problems.

[0005] To achieve the above-mentioned objectives, the present invention proposes a labyrinth-type pre-dust removal electrostatic precipitator, comprising a shell, wherein a pre-dust removal chamber and a plurality of electric fields arranged in sequence from front to back behind the pre-dust removal chamber are provided in the shell, and a plurality of trough plates are provided in the pre-dust removal chamber, and the trough plates are arranged in two rows, front and back, in the pre-dust removal chamber, and the trough plates in the front and back rows are staggered, with the notches of the trough plates in the rear row facing forward and the notches of the trough plates in the front row facing backward, and the trough plates are composed of a flat plate and a trough wall body formed by folding the two ends of the flat plate 90 degrees in the same direction.

[0006] Preferably, the free end of the groove wall body is folded inwardly by 90 degrees to form a blocking edge.

[0007] Preferably, a support is provided at the lower end of the front row of trough plates, and a fixed windshield located in the ash hopper below the support is provided on the support, and the fixed windshield is arranged to be tilted forward.

[0008] Preferably, a movable windshield is rotatably provided at the lower end of the fixed windshield, and when the movable windshield is naturally suspended, the lower end of the movable windshield fits against the front inclined inner wall of the ash hopper.

[0009] Preferably, the lower end of the movable windshield is provided with a fitting portion that fits with the front inclined inner wall of the ash hopper, and a magnet strip is provided in the fitting portion.

[0010] Preferably, a vertical windshield is provided at the lower end of the rear row of trough plates, and the height of the lower end of the vertical windshield is lower than the height of the lower end of the movable windshield.

[0011] Preferably, W-shaped resistance plates arranged in a row are provided in the ash hopper behind the vertical wind shield, and two adjacent W-shaped resistance plates in front and behind partially overlap.

[0012] The beneficial effects of the present invention are as follows: the present invention provides a plurality of trough plates in the pre-dust removal chamber, and the trough plates are arranged into two rows, front and back, in the pre-dust removal chamber. The trough plates in the front and back rows are staggered, with the notches of the trough plates in the rear row facing forward and the notches of the trough plates in the front row facing backward. The trough plates are composed of a flat plate and a trough wall body formed by folding the two ends of the flat plate 90 degrees in the same direction. When the dust-laden flue gas flows through a labyrinth-type pre-dust removal device formed by the arrangement of trough plates with a certain structure, local eddies are generated, causing the particle phase to separate from the gas phase and settle, or collide when contacting the trough plates, causing the particle phase to stop or reduce its speed, causing part of the particle phase to settle, and part to rebound and continue to move with the gas phase, thereby increasing the collision probability of the particle phase in the airflow, causing small particles to adhere to large particles, and increasing the possibility of gravity sedimentation. Compared with the prior art, it can improve the dust removal efficiency and effect and reduce the occupied space.

[0013] The features and advantages of the present invention will be described in detail through embodiments with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic structural diagram of a labyrinth-type pre-dust removal electrostatic precipitator of the present invention; Figure 2 It is a partial top view of a labyrinth-type pre-dust removal electrostatic precipitator of the present invention; Figure 3 yes Figure 1 A magnified view of middle A; Figure 4 yes Figure 2 Enlarged view of middle B; Figure 5 It is the particle phase distribution before passing through the grooved plate; Figure 6 It is the particle phase distribution after passing through the grooved plate; Figure 7 It is a schematic diagram of the generation of local vortex.

[0015] In the figure: 1-shell, 2-pre-dust removal chamber, 3-trough plate, 4-support, 5-fixed windshield, 6-ash hopper, 7-movable windshield, 8-fitting part, 9-magnetic bar, 10-vertical windshield, 11-W-shaped resistance plate, 12-electric field, 31-flat plate, 32-trough wall, 33-blocking edge. DETAILED DESCRIPTION

[0016] See Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 and Figure 7 The present invention provides a labyrinth-type pre-dust removal electrostatic precipitator, comprising a shell 1, wherein a pre-dust removal chamber 2 and a plurality of electric fields 12 are arranged in sequence from front to back behind the pre-dust removal chamber 2. A plurality of trough plates 3 are provided in the pre-dust removal chamber 2, and the trough plates 3 are arranged in two rows, front and back, in the pre-dust removal chamber 2. The trough plates 3 in the front and back rows are staggered, with the notches of the trough plates 3 in the rear row facing forward and the notches of the trough plates 3 in the front row facing backward. The trough plates 3 are composed of a flat plate 31 and a trough wall body 32 formed by folding both ends of the flat plate 31 in the same direction by 90 degrees.

[0017] The free end of the groove wall 32 is folded inwardly by 90 degrees to form a blocking edge 33 .

[0018] A support 4 is provided at the lower end of the front row of trough plates 3. A fixed windshield 5 located in the ash hopper 6 below the support 4 is provided on the support 4. The fixed windshield 5 is tilted forward.

[0019] A movable windshield 7 is rotatably provided at the lower end of the fixed windshield 5 . When the movable windshield 7 is naturally suspended, the lower end of the movable windshield 7 is in contact with the front inclined inner wall of the ash hopper 6 .

[0020] The lower end of the movable windshield plate 7 is provided with a fitting portion 8 that fits with the front inclined inner wall of the ash hopper 6, and a magnet strip 9 is provided in the fitting portion 8.

[0021] A vertical windshield 10 is provided at the lower end of the rear row of trough plates 3 , and the height of the lower end of the vertical windshield 10 is lower than the height of the lower end of the movable windshield 7 .

[0022] W-shaped resistance plates 11 are arranged in a row in the ash hopper 6 behind the vertical wind shield 10, and two adjacent W-shaped resistance plates 11 in front and behind partially overlap.

[0023] Working process of the present invention: The present invention provides a labyrinth-type pre-dust removal electrostatic precipitator. During operation, a plurality of trough plates 3 are provided in the pre-dust removal chamber 2. The trough plates 3 are arranged into two rows, front and back, in the pre-dust removal chamber 2. The trough plates 3 in the front and back rows are staggered, with the notches of the trough plates 3 in the rear row facing forward and the notches of the trough plates 3 in the front row facing backward. The trough plates 3 are composed of a flat plate 31 and a trough wall body 32 formed by folding the two ends of the flat plate 31 90 degrees in the same direction. When the dust-laden flue gas flows through the labyrinth-type pre-dust removal device formed by the arrangement of the trough plates 3 with a certain structure, local eddy currents are generated, causing the particle phase to separate from the gas phase and settle, or collide when contacting the trough plates 3, causing the particle phase to stop or reduce its speed, causing part of the particle phase to settle, and part to rebound and continue to move with the gas phase, thereby increasing the collision probability of the particle phase in the airflow, causing small particles to adhere to large particles, and increasing the possibility of gravity sedimentation.

[0024] When the dust in the ash hopper 6 in front of the fixed wind shield 5 reaches a certain amount, the movable wind shield 7 overcomes the attractive fixing force of the magnet bar 9 under the action of the dust's own weight, and the movable wind shield 7 rotates counterclockwise to open for ash discharge operation. Through the cooperation of the fixed wind shield 5 and the movable wind shield 7, the escape of flue gas from the ash hopper 6 is effectively reduced; through the cooperation of the vertical wind shield 10 and the W-shaped resistance plate 11, the flue gas passing from under the rear row of trough plates 3 is blocked, reducing the passability of the flue gas, thereby further improving the dust removal efficiency of the maze-type pre-dust removal device.

[0025] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention falls within the protection scope of the present invention.

Claims

1. A labyrinth-type pre-dust removal electrostatic precipitator, characterized in that: The invention comprises a shell (1), wherein a pre-dust removal chamber (2) and a plurality of electric fields (12) arranged in sequence from front to back behind the pre-dust removal chamber (2) are provided in the shell (1), wherein a plurality of grooved plates (3) are provided in the pre-dust removal chamber (2), wherein the grooved plates (3) are arranged in two rows in the pre-dust removal chamber (2), and the grooved plates (3) in the front and rear rows are staggered, wherein the grooved plates (3) in the rear row have grooves facing forward, and the grooved plates (3) in the front row have grooves facing backward, and the grooved plates (3) are composed of a flat plate (31) and a groove wall body (32) formed by folding both ends of the flat plate (31) in the same direction by 90 degrees.

2. A labyrinth-type pre-dust removal electrostatic precipitator according to claim 1, characterized in that: The free end of the groove wall (32) is folded inwards by 90 degrees to form a blocking edge (33).

3. The labyrinth-type pre-dust removal electrostatic precipitator according to claim 1, characterized in that: The lower end of the front row trough plate (3) is provided with a support (4), and the support (4) is provided with a fixed windshield (5) located in the ash hopper (6) below it, and the fixed windshield (5) is arranged to be tilted forward.

4. A labyrinth-type pre-dust removal electrostatic precipitator according to claim 1, characterized in that: A movable windshield (7) is rotatably provided at the lower end of the fixed windshield (5); when the movable windshield (7) is naturally suspended, the lower end of the movable windshield (7) is in contact with the front inclined inner wall of the ash hopper (6).

5. A labyrinth-type pre-dust removal electrostatic precipitator according to claim 4, characterized in that: The lower end of the movable windshield (7) is provided with a fitting portion (8) that fits with the front inclined inner wall of the ash hopper (6), and a magnet bar (9) is provided in the fitting portion (8).

6. A labyrinth-type pre-dust removal electrostatic precipitator according to claim 5, characterized in that: A vertical windshield (10) is provided at the lower end of the rear row of trough plates (3), and the height of the lower end of the vertical windshield (10) is lower than the height of the lower end of the movable windshield (7).

7. The labyrinth-type pre-dust removal electrostatic precipitator according to claim 5, characterized in that: W-shaped resistance plates (11) are arranged in a row in the ash hopper (6) behind the vertical windshield (10), and two adjacent W-shaped resistance plates (11) in front and behind partially overlap.

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