Labyrinth type pre-dedusting electric dust collector

Abstract

This utility model discloses a labyrinth-type pre-dust removal electrostatic precipitator, including a housing. The housing contains a pre-dust removal chamber and several electric fields arranged sequentially from front to back behind the pre-dust removal chamber. The pre-dust removal chamber contains several grooved plates arranged in two rows, front and back, with the grooved plates in the two rows staggered. The grooved plates in the back row face forward, and the grooved plates in the front row face backward. Each grooved plate is composed of a flat plate and groove walls formed by folding the two ends of the flat plate in the same direction by 90 degrees. Compared with the prior art, this device can improve dust removal efficiency and effect while reducing space occupation.

Description

Technical Field

[0001] This utility model relates to the technical field of flue gas pollutant treatment and dust removal, and in particular to the technical field of a labyrinth-type pre-dust removal electrostatic precipitator. Background Technology

[0002] Electrostatic precipitators (ESPs) have advantages such as high dust removal efficiency, wide applicability, low operating costs, convenient use and maintenance, and no secondary pollution, making them the mainstream equipment for flue gas dust control in China. However, when the dust concentration in the inlet flue gas is too high, a large number of dust particles enter the corona zone, adsorb gas ions, and wrap around 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 shut down, which seriously affects the dust removal efficiency. Adding a gravity settling chamber in front of the ESP electric field is a common treatment method.

[0003] Gravity settling chambers have the following problems: 1. They require a large space and occupy a large area; 2. Their separation efficiency is relatively low, mainly effective for large particles such as those with a diameter >50μm, but their dust removal effect on fine particles such as PM2.5 or submicron particles is not ideal, and their stability is poor due to multiple factors such as gas velocity and particle density; 3. If the gravity settling chamber is not designed properly, it may lead to airflow turbulence, and the subsequent airflow distribution may not be guaranteed, which will reduce the efficiency of the electrostatic precipitator. Summary of the Invention

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

[0005] To achieve the above objectives, this utility model proposes a labyrinth-type pre-dust removal electrostatic precipitator, comprising a housing, wherein a pre-dust removal chamber is provided inside the housing and several electric fields are arranged sequentially from front to back behind the pre-dust removal chamber. Several grooved plates are provided inside the pre-dust removal chamber, and the grooved plates are arranged in two rows in front and back, with the grooved plates in the two rows staggered. The grooved plates in the back row face forward, and the grooved plates in the front row face backward. Each grooved plate is composed of a flat plate and a groove wall formed by folding the two ends of the flat plate in the same direction by 90 degrees.

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

[0007] Preferably, the lower end of the trough-shaped plate in the front row is provided with a support, and a fixed wind baffle plate is provided on the support and located in the ash hopper below it. The fixed wind baffle plate is inclined forward.

[0008] Preferably, the lower end of the fixed wind baffle is rotatably provided with a movable wind baffle, and when the movable wind baffle is naturally suspended, the lower end of the movable wind baffle is in contact with the front inclined inner wall of the ash hopper.

[0009] Preferably, the lower end of the movable wind baffle is provided with a fitting part that fits against the front inclined inner wall of the ash hopper, and a magnetic strip is provided in the fitting part.

[0010] Preferably, the lower end of the grooved plate in the rear row is provided with a vertical wind baffle, the lower end of which is lower than the lower end of the movable wind baffle.

[0011] Preferably, the ash hopper behind the vertical windbreak is provided with W-shaped resistance plates arranged in a row, with two adjacent W-shaped resistance plates partially overlapping.

[0012] The beneficial effects of this utility model are as follows: This utility model provides several trough-shaped plates in the pre-dust removal chamber, arranged in two rows, front and back, with the trough-shaped plates staggered. The groove openings of the trough-shaped plates in the back row face forward, and the groove openings of the trough-shaped plates in the front row face backward. The trough-shaped plates are composed of flat plates and groove walls formed by folding the ends of the flat plates in the same direction at 90 degrees. When the dust-laden flue gas flows through the labyrinth-type pre-dust removal device formed by the arrangement of the trough-shaped plates with a certain structure, local eddies are generated, causing the particulate phase to separate from the gas phase and settle. Alternatively, when the particulate phase contacts the trough-shaped plates, it collides with the gas phase, causing the particulate phase to become stationary or its velocity to decrease. This causes some part of the particulate phase to settle, while some rebounds and continues to move with the gas phase, increasing the probability of collision between the particulate phase in the airflow. This causes small particles to adhere to large particles, increasing the possibility of gravity settling. Compared with the prior art, this utility model can improve dust removal efficiency and effect while reducing the space occupied.

[0013] The features and advantages of this utility model will be described in detail through embodiments and accompanying drawings. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a labyrinth-type pre-dust removal electrostatic precipitator according to this utility model;

[0015] Figure 2 This is a partial top view of a labyrinth-type pre-dust removal electrostatic precipitator according to this utility model;

[0016] Figure 3 yes Figure 1 Enlarged view of A in the middle;

[0017] Figure 4 yes Figure 2 Enlarged view of B in the middle;

[0018] Figure 5 It is the particle phase distribution before passing through the trough plate;

[0019] Figure 6 It is the particle phase distribution after passing through the trough plate;

[0020] Figure 7 This is a schematic diagram of the generation of local eddies.

[0021] In the figure: 1-shell, 2-pre-dust removal chamber, 3-trough plate, 4-support, 5-fixed baffle plate, 6-ash hopper, 7-movable baffle plate, 8-fitting part, 9-magnetic strip, 10-vertical baffle plate, 11-W-shaped resistance plate, 12-electric field, 31-flat plate, 32-trough wall, 33-blocking edge. Detailed Implementation

[0022] See Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 This utility model discloses a labyrinth-type pre-dust removal electrostatic precipitator, comprising a housing 1, wherein a pre-dust removal chamber 2 is provided inside the housing 1 and a plurality of electric fields 12 arranged sequentially from front to back behind the pre-dust removal chamber 2. A plurality of grooved plates 3 are provided inside the pre-dust removal chamber 2, which are arranged in two rows in front and back, with the grooved plates 3 in the front and back rows staggered. The grooved plates 3 in the back row face forward and the grooved plates 3 in the front row face backward. Each grooved plate 3 is composed of a flat plate 31 and a groove wall 32 formed by folding the two ends of the flat plate 31 in the same direction by 90 degrees.

[0023] The free end of the groove wall 32 is folded inward at 90 degrees to form a blocking edge 33.

[0024] The lower end of the trough plate 3 in the front row is provided with a support 4, and a fixed wind baffle 5 is provided on the support 4 located in the ash hopper 6 below it. The fixed wind baffle 5 is inclined forward.

[0025] The lower end of the fixed wind baffle 5 is rotatably provided with a movable wind baffle 7. When the movable wind baffle 7 is naturally suspended, the lower end of the movable wind baffle 7 is in contact with the front inclined inner wall of the ash hopper 6.

[0026] The lower end of the movable wind baffle 7 is provided with a fitting part 8 that fits against the front inclined inner wall of the ash hopper 6, and a magnetic strip 9 is provided in the fitting part 8.

[0027] The lower end of the grooved plate 3 in the rear row is provided with a vertical wind baffle 10, and the lower end of the vertical wind baffle 10 is lower than the lower end of the movable wind baffle 7.

[0028] The ash hopper 6 behind the vertical windbreak plate 10 is provided with W-shaped resistance plates 11 arranged in a row, with two adjacent W-shaped resistance plates 11 partially overlapping.

[0029] The working process of this utility model:

[0030] In the operation of this labyrinth-type pre-dust removal electrostatic precipitator, several trough-shaped plates 3 are arranged in two rows within the pre-dust removal chamber 2, with the two rows staggered. The groove openings of the trough-shaped plates 3 in the rear row face forward, and the groove openings of the trough-shaped plates 3 in the front row face backward. Each trough-shaped plate 3 consists of a flat plate 31 and a groove wall 32 formed by folding the two ends of the flat plate 31 in the same direction by 90 degrees. When the dust-laden flue gas flows through the labyrinth-type pre-dust removal device formed by the arrangement of the trough-shaped plates 3, local eddies are generated, causing the particulate phase to separate from the gas phase and settle. Alternatively, when the particulate phase contacts the trough-shaped plates 3, it collides with the gas phase, causing the particulate phase to become stationary or its velocity to decrease. This causes some part of the particulate phase to settle, while some rebounds and continues to move with the gas phase, increasing the probability of collision between the particulate phase in the airflow. This causes small particles to adhere to large particles, increasing the possibility of gravity settling.

[0031] When the dust in the ash hopper 6 in front of the fixed baffle 5 reaches a certain amount, the movable baffle 7 overcomes the attraction and fixing force of the magnetic strip 9 under the weight of the dust itself, and the movable baffle 7 rotates counterclockwise to open and discharge ash. Through the cooperation of the fixed baffle 5 and the movable baffle 7, the escape of flue gas from the ash hopper 6 is effectively reduced. Through the cooperation of the vertical baffle 10 and the W-shaped resistance plate 11, the flue gas passing under the trough plate 3 in the rear row is blocked, reducing the flue gas's permeability, thereby further improving the dust removal efficiency of the labyrinth-type pre-dust removal device.

[0032] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the protection scope of the present invention.

Claims

1. A labyrinth-type pre-dust removal electrostatic precipitator, characterized in that: Includes a shell (1), inside which is a pre-dust removal chamber (2) and several electric fields (12) arranged from front to back behind the pre-dust removal chamber (2). Inside the pre-dust removal chamber (2) are several trough-shaped plates (3). The trough-shaped plates (3) are arranged in two rows in the pre-dust removal chamber (2), with the trough-shaped plates (3) in the front and back rows staggered. The slots of the trough-shaped plates (3) in the back row face forward, and the slots of the trough-shaped plates (3) in the front row face backward. The trough-shaped plate (3) is composed of a flat plate (31) and a trough wall (32) formed by folding the two ends of the flat plate (31) in the same direction by 90 degrees.

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

3. The labyrinth-type pre-dust removal electrostatic precipitator as described in claim 1, characterized in that: The lower end of the trough plate (3) in the front row is provided with a support (4), and a fixed wind baffle (5) is provided on the support (4) in the ash hopper (6) below it. The fixed wind baffle (5) is inclined forward.

4. The labyrinth-type pre-dust removal electrostatic precipitator as described in claim 3, characterized in that: The lower end of the fixed wind baffle (5) is provided with a movable wind baffle (7). When the movable wind baffle (7) is naturally suspended, the lower end of the movable wind baffle (7) is in contact with the front inclined inner wall of the ash hopper (6).

5. The labyrinth-type pre-dust removal electrostatic precipitator as described in claim 4, characterized in that: The lower end of the movable wind deflector (7) is provided with a fitting part (8) that fits against the front inclined inner wall of the ash hopper (6), and a magnetic strip (9) is provided in the fitting part (8).

6. The labyrinth-type pre-dust removal electrostatic precipitator as described in claim 5, characterized in that: The lower end of the grooved plate (3) in the rear row is provided with a vertical wind deflector (10), and the lower end of the vertical wind deflector (10) is lower than the lower end of the movable wind deflector (7).

7. The labyrinth-type pre-dust removal electrostatic precipitator as described in claim 6, characterized in that: The ash hopper (6) behind the vertical windbreak plate (10) is provided with W-shaped resistance plates (11) arranged in a row, with two adjacent W-shaped resistance plates (11) partially overlapping.

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