Pre-ducting device for electrostatic precipitators

Abstract

This utility model relates to the field of electrostatic precipitator flue gas duct technology, and discloses a pre-flue gas duct device for electrostatic precipitators, including a flue gas duct. A spray device is installed inside the vertical section of the flue gas duct. A liquid receiving tank is fixedly installed at the bottom of the flue gas duct, and a drain pipe is embedded in the bottom of the liquid receiving tank. An electrically controlled valve is installed on the drain pipe. The spray device is located directly below the liquid receiving tank. A filter plate is embedded inside the flue gas duct, positioned directly above the liquid receiving tank. A sealing plate is slidably installed on the flue gas duct, and a handle is fixedly installed on the sealing plate. A slag pushing mechanism and a slag receiving mechanism are provided on the flue gas duct. This utility model, through spray granulation, solid-liquid separation, and automatic slag discharge design, effectively improves dust flowability, significantly reduces the risk of ash hopper blockage, and enhances the operational stability and maintenance convenience of the dust removal system.

Description

Technical Field

[0001] This utility model relates to the technical field of electrostatic precipitator flue gas channels, specifically a pre-flue gas duct device for electrostatic precipitators. Background Technology

[0002] Electrostatic precipitators are highly efficient dust removal devices widely used in industrial flue gas purification. They separate particulate matter from flue gas using an electrostatic field, thereby purifying the flue gas. With increasingly stringent environmental protection requirements, electrostatic precipitators are being used more and more extensively in various coal-fired power plants, metallurgy, building materials, and other industries. However, in actual operation, the dust removal efficiency and operational stability of electrostatic precipitators are affected by a variety of factors, among which the flow state of the flue gas before entering the electrostatic precipitator is one of the key factors.

[0003] The patent with publication number CN202479041U discloses a pre-flue for an electrostatic precipitator, comprising a flue gas uniform distribution device, a slurry atomizing nozzle, a flue body, a flue gas outlet, an air compressor, a stirrer, a slurry pump, a slurry pipe, and a flue inlet. The flue body is connected to the flue gas inlet and outlet at both ends. The flue body, near the flue gas inlet, contains the flue gas uniform distribution device and the slurry atomizing nozzle in sequence. The slurry atomizing nozzle is connected to the slurry pump and the air compressor outside the flue body, respectively. The slurry pump is connected to the stirrer.

[0004] However, the above-mentioned device has the following problems when in use: the wet slag accumulated in the ash hopper has the characteristics of high moisture content, high viscosity, and poor flowability. It is usually discharged through the discharge port and enters the collection device. Due to the special physical properties of the wet slag itself, coupled with unreasonable discharge port structure design or untimely slag removal, it is very easy for it to accumulate, adhere, or even caking at the discharge port, causing discharge port blockage. Discharge port blockage not only affects the continuous operation of the system, preventing the wet slag from being discharged smoothly, but may also cause slag accumulation and corrosion inside the equipment, and even affect the normal operation of the entire dust removal system. Utility Model Content

[0005] The purpose of this utility model is to solve the problems existing in the prior art, and the proposed pre-flue device for electrostatic precipitators significantly reduces the risk of ash hopper blockage and improves the operational stability and maintenance convenience of the dust removal system.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] The electrostatic precipitator uses a pre-flue system, including a flue gas duct. A spray system is installed inside the vertical section of the flue gas duct. A liquid receiving tank is fixedly installed at the bottom of the flue gas duct, and a drain pipe is embedded in the bottom of the liquid receiving tank. An electrically controlled valve is installed on the drain pipe. The spray system is located directly below the liquid receiving tank. A filter plate is embedded inside the flue gas duct, positioned directly above the liquid receiving tank. A sealing plate is slidably installed on the flue gas duct, and a handle is fixedly installed on the sealing plate. The flue gas duct is equipped with a slag pushing mechanism and a slag receiving mechanism.

[0008] Preferably, the slag pushing mechanism includes a mounting frame, which is slidably installed inside the flue gas channel. A push plate is rotatably installed on the mounting frame. Connecting rods are fixedly installed on both sides of the mounting frame, and the other side of each of the two connecting rods is fixedly installed on a sealing plate.

[0009] Preferably, the filter plate is positioned between the mounting frame and the sealing plate.

[0010] Preferably, the slag receiving mechanism includes a fixed frame and a slag receiving box. The fixed frame is fixedly installed on the flue gas channel and is adapted to the slag receiving box. Both sides of the slag receiving box are fixedly installed with lugs. The fixed frame has placement slots adapted to the lugs at corresponding positions. Both lugs are fixedly installed with handles.

[0011] Preferably, the sealing plate is adapted to the exhaust port of the dust duct, and a sealing gasket is embedded in the side wall of the sealing plate.

[0012] Preferably, the slag receiving box is located directly below the waste discharge port of the flue gas duct.

[0013] Preferably, a driven gear is fixedly installed on the rotating shaft of the push plate, an electric telescopic rod is provided on the mounting frame, and an active gear plate is installed at the output end of the shaft of the electric telescopic rod, with the active gear plate meshing with the driven gear.

[0014] Preferably, a protective chamber is fixedly installed on the mounting frame, and the electric telescopic rod, the active gear plate, and the connection parts between the passive gear and the active gear plate are all located inside the protective chamber.

[0015] Preferably, rotating blocks are rotatably installed on both sides of the sealing plate, and limit frames are fixedly installed at corresponding positions on both sides of the dust duct. The limit frames are L-shaped and are located on the rotation path of the corresponding rotating blocks.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) This utility model achieves efficient separation and convenient collection of wet sludge through ingenious design: the dust-containing slurry and agglomerated large particles generated by spraying are first intercepted by the filter plate located directly below the spraying area (preliminary solid-liquid separation), allowing the liquid and fine particles to pass through and fall into the bottom liquid receiving tank (discharge can be controlled through the drain pipe with an electric valve); while the large wet sludge accumulated on the filter plate is cleaned by an innovative mechanical linkage mechanism - the operator only needs to slide the sealing plate outward by the handle, and this action will drive the mounting frame and its push plate to move towards the waste discharge port through the rigid connecting rods on both sides. The bottom edge of the push plate then sweeps the surface of the filter plate, forcibly pushing the wet sludge clumps out of the open waste discharge port; the pushed wet sludge falls directly into the specially designed sludge receiving box directly below under the action of gravity. The sludge receiving box is quickly engaged with the placement groove on the fixed frame by the lug, and can be easily picked up and placed for cleaning by the handle. At the same time, when the sealing plate is closed, it works with the sealing gasket and the rotating block-limiting frame locking mechanism to ensure that the exhaust port is tightly sealed, maintain the negative pressure environment of the flue, and ensure that the separation and collection process is carried out under closed and stable conditions, which significantly improves the slag removal efficiency and operation convenience, and reduces the maintenance difficulty.

[0018] (2) This utility model integrates a remotely controllable air inlet opening adjustment mechanism to optimize airflow distribution to adapt to different working conditions: by controlling the extension and retraction of the electric telescopic rod installed on the mounting frame, the active toothed plate connected to it is driven to make linear motion; the active toothed plate meshes with the passive gear fixed on the rotating shaft of the push plate, converting linear motion into rotational motion, thereby precisely adjusting the angle of the push plate relative to the flue wall and changing the size of the cross-section of the air inlet channel formed therein (for example, increasing the opening to reduce resistance or decreasing the opening to increase flow velocity). This adjustment function enables the system to flexibly optimize the flow field according to the actual flue gas flow, dust load or system back pressure, thereby improving spray agglomeration efficiency or reducing energy consumption. In particular, the entire adjustment mechanism (electric telescopic rod, active toothed plate, passive gear and their meshing parts) is completely enclosed in a protective chamber fixed on the mounting frame, effectively isolating the flue from the erosion of humid, corrosive gases and dust, greatly improving the reliability, durability and operational safety of precision transmission components, and ensuring long-term effective and stable operation of the adjustment function. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the present invention.

[0020] Figure 2 This is a schematic diagram of the slag pushing mechanism of this utility model.

[0021] Figure 3 This is a schematic diagram showing the installation position of the filter plate of this utility model.

[0022] Figure 4 This is a schematic diagram of the slag pushing mechanism of this utility model.

[0023] Figure 5 This is a schematic diagram showing the installation position of the rotating block of this utility model.

[0024] Figure 6 This is a schematic diagram illustrating the principle of the rotating push plate of this utility model.

[0025] Figure 7 This utility model Figure 2 Enlarged view of point A in the middle.

[0026] In the diagram: 1. Dust duct; 2. Spraying device; 3. Liquid receiving tank; 4. Drain pipe; 5. Electrically controlled valve; 6. Fixing frame; 7. Slag receiving box; 8. Sealing plate; 9. Handle; 10. Ear block; 11. Placement slot; 12. Mounting frame; 13. Push plate; 14. Connecting rod; 15. Filter plate; 16. Sealing gasket; 17. Protective chamber; 18. Rotating block; 19. Passive gear; 20. Active gear plate; 21. Electric telescopic rod; 22. Limiting frame. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0028] Please see Figures 1 to 7 The electrostatic precipitator uses a pre-flue device, which includes a flue gas channel 1. The vertical part of the flue gas channel 1 is equipped with a spray device 2, which is the same as the corresponding mechanism in the existing patent CN202479041U. Its main principle is that when the dust-laden flue gas flows through the vertical part of the flue gas channel 1, the spray device 2 is activated, and lime slurry or other reaction liquid is atomized and sprayed into the flue gas channel 1. The dust particles (especially ultrafine particles) in the flue gas collide, adhere, and agglomerate with the slurry droplets, forming larger agglomerated particles or particles wrapped by droplets (i.e., "fluidized granulation growth"), which improves the subsequent electrostatic dust removal. External equipment such as pumps and compressors provide power and pressure for spraying. Since the spray device 2 is existing technology, it will not be described in detail here.

[0029] A liquid receiving tank 3 is fixedly installed at the bottom of the dust and smoke channel 1. A drain pipe 4 is embedded in the bottom of the liquid receiving tank 3. An electric control valve 5 is installed on the drain pipe 4. A spray device 2 is located directly below the liquid receiving tank 3. A filter plate 15 is embedded inside the dust and smoke channel 1. The filter plate 15 is located directly above the liquid receiving tank 3.

[0030] The sprayed slurry and the large particles captured and agglomerated by the slurry (forming "wet sludge") will drip or settle downwards. Filter plate 15 (located below the spray zone) is used for preliminary filtration and support, allowing liquid and fine particles to pass through, but trapping larger wet sludge clumps. Slurry that cannot be carried away by the flue gas and fine wet sludge that passes through filter plate 15 eventually fall into the receiving tank 3 at the bottom for collection. When the liquid level or sediment in the receiving tank 3 reaches a certain level, the electric control valve 5 can be opened remotely or manually, and the waste liquid rich in particulate matter can be discharged from the system for treatment through the drain pipe 4, thus achieving solid-liquid separation.

[0031] A sealing plate 8 is slidably installed on the dust duct 1, and a handle 9 is fixedly installed on the sealing plate 8. The dust duct 1 is equipped with a slag pushing mechanism and a slag receiving mechanism. The sealing plate 8 is used to close or open the waste discharge port on the side wall of the dust duct 1. Operators can manually slide the sealing plate 8 using the handle 9. The slag pushing mechanism is responsible for pushing out larger wet slag clumps accumulated on the filter plate 15 from the dust duct 1, while the slag receiving mechanism is located below the waste discharge port to receive the pushed-out wet slag.

[0032] like Figure 3 , Figure 4 As shown, the slag pushing mechanism includes a mounting frame 12, which is slidably installed inside the flue gas channel 1. A pusher plate 13 is rotatably installed on the mounting frame 12. Connecting rods 14 are fixedly installed on both sides of the mounting frame 12, and the other side of the two connecting rods 14 is fixedly installed on the sealing plate 8.

[0033] The connecting rod 14 acts as a rigid transmission component, directly and rigidly connecting the sealing plate 8 to the mounting frame 12. When the operator pulls the sealing plate 8 through the handle 9, the linear movement of the sealing plate 8 is synchronously transmitted to the mounting frame 12 through the connecting rods 14 on both sides, forcing the mounting frame 12 to slide in the same direction within the dust duct 1. As the mounting frame 12 slides, it drives the push plate 13 on it to move synchronously. The bottom edge of the push plate 13 sweeps the surface of the filter plate 15, thereby pushing the wet sludge clumps accumulated on the filter plate 15 directly towards the open waste discharge port for subsequent collection.

[0034] like Figure 3 As shown, the filter plate 15 is positioned between the mounting frame 12 and the sealing plate 8. The position of the filter plate 15 is designed so that it is exactly within the "operating range" of the slag pushing mechanism. When the pushing plate 13 moves towards the waste discharge port along with the sealing plate 8, its trajectory sweeps the surface of the filter plate 15, thereby pushing the wet slag accumulated on the filter plate 15 toward the waste discharge port.

[0035] like Figure 2 , Figure 3As shown, the slag receiving mechanism includes a fixed frame 6 and a slag receiving box 7. The fixed frame 6 is fixedly installed on the flue gas channel 1. The fixed frame 6 is adapted to the slag receiving box 7. Ear blocks 10 are fixedly installed on both sides of the slag receiving box 7. The fixed frame 6 has a placement groove 11 adapted to the ear blocks 10 at the corresponding position. A handle 9 is fixedly installed on both ear blocks 10.

[0036] The slag receiving mechanism is used to conveniently collect and remove the pushed-out wet slag. The fixed frame 6 is welded or bolted to the bottom of the exhaust outlet of the flue gas channel 1. When slag needs to be cleaned, the operator holds the handles 9 on both sides of the slag receiving box 7 and lifts it up, so that the lugs 10 on both sides of the box body are removed from the placement slots 11 on the fixed frame 6. The full slag receiving box 7 can then be taken out for cleaning or replacement. After cleaning, the lugs 10 of the empty slag receiving box 7 are aligned with the placement slots 11 and lowered down, so that it can be placed stably on the fixed frame 6, waiting to receive the next batch of pushed-out slag.

[0037] like Figure 4 As shown, the sealing plate 8 is adapted to the exhaust port of the dust collection channel 1, and a sealing gasket 16 is embedded in the side wall of the sealing plate 8. When the dust collector is operating normally, the sealing plate 8 slides to the closed position, completely covering the exhaust port. The embedded sealing gasket 16 is pressed tightly against the wall of the dust collection channel 1 to ensure that the exhaust port is tightly sealed, prevent flue gas leakage, and maintain the negative pressure environment and airflow organization within the dust collection channel 1.

[0038] like Figure 2 As shown, the slag receiving box 7 is located directly below the waste discharge port of the flue gas channel 1. When the sealing plate 8 is opened for slag discharge, the wet slag clumps pushed out from the waste discharge port fall directly into the slag receiving box 7 directly below under the action of gravity, ensuring that the slag clumps are effectively collected and will not scatter.

[0039] like Figure 6 As shown, a driven gear 19 is fixedly installed on the rotating shaft of the push plate 13, and an electric telescopic rod 21 is provided on the mounting frame 12. An active gear plate 20 is installed at the output end of the shaft of the electric telescopic rod 21. The active gear plate 20 and the driven gear 19 are meshed to change the size of the air inlet.

[0040] When smoke and dust enter, the electric telescopic rod 21 is extended or retracted by controlling it. The linear motion of the telescopic rod drives the active toothed plate 20 connected to it to move in a straight line. The active toothed plate 20 meshes with the passive gear 19 fixed on the rotating shaft of the push plate 13, thereby converting the linear motion of the toothed plate into the rotational motion of the passive gear 19 (and the rotating shaft of the push plate 13). Ultimately, this drives the push plate 13 to rotate around its hinge axis, changing its angle and thus adjusting the opening of the channel (air inlet) it controls, in order to optimize airflow or adapt to different working conditions.

[0041] Preferably, the electric telescopic pole 21 can be powered by a built-in power supply or an external power supply, but the cable should not affect the normal movement of the mounting frame 12.

[0042] Preferably, the electric telescopic rod 21 should be linked with the corresponding sensor so that it can perform corresponding operations according to different situations. Since this part is prior art, it will not be described in detail here.

[0043] like Figure 4 As shown, a protective chamber 17 is fixedly installed on the mounting frame 12. The electric telescopic rod 21, the driving gear plate 20, and the connection points between the driven gear 19 and the driving gear plate 20 are all located inside the protective chamber 17. The protective chamber 17 is a protective cover installed on the mounting frame 12. It completely encloses the electric telescopic rod 21, the driving gear plate 20, the driven gear 19, and their meshing areas. Its function is to protect these precision transmission components from the erosion of moisture, corrosive gases, and dust in the fume duct 1, prevent mechanical damage, and ensure the safety of operators.

[0044] like Figure 7 As shown, rotating blocks 18 are rotatably installed on both sides of the sealing plate 8, and limit frames 22 are fixedly installed on both sides of the dust duct 1 at corresponding positions. The limit frames 22 are L-shaped and are located on the rotation path of the corresponding rotating blocks 18. The rotating blocks 18 and the limit frames 22 together constitute the locking and safety limiting device of the sealing plate 8.

[0045] When the sealing plate 8 slides to the fully closed position, the operator can manually rotate the rotating blocks 18 on both sides of the sealing plate 8. During the rotation, the rotating blocks 18 will be locked inside the L-shaped limit frame 22 fixed to the side wall of the flue gas channel 1. This plays a mechanical locking role, preventing the sealing plate 8 from being accidentally opened under the negative pressure or vibration of the flue gas channel 1, and ensuring the sealing reliability during operation. When it is necessary to open, the rotating blocks 18 must be rotated first to make them free from the constraint of the limit frame 22.

[0046] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pre-flue device for electrostatic precipitators, comprising a flue channel (1), inside the vertical part of which a spraying device (2) is arranged, characterised in that A liquid receiving tank (3) is fixedly installed at the bottom of the dust channel (1). A drain pipe (4) is embedded at the bottom of the liquid receiving tank (3). An electric control valve (5) is installed on the drain pipe (4). A spray device (2) is located directly below the liquid receiving tank (3). A filter plate (15) is embedded inside the dust channel (1). The filter plate (15) is located directly above the liquid receiving tank (3). A sealing plate (8) is slidably installed on the dust channel (1). A handle (9) is fixedly installed on the sealing plate (8). A slag pushing mechanism and a slag receiving mechanism are provided on the dust channel (1).

2. A prechamber device for electrostatic precipitators according to claim 1, characterized in that The slag pushing mechanism includes a mounting frame (12), which is slidably installed inside the dust and smoke channel (1). A push plate (13) is rotatably installed on the mounting frame (12). Connecting rods (14) are fixedly installed on both sides of the mounting frame (12), and the other side of the two connecting rods (14) is fixedly installed on the sealing plate (8).

3. A prechamber for electrostatic precipitators according to claim 2, characterized in that The filter plate (15) is located between the mounting frame (12) and the sealing plate (8).

4. The preflue device for electrostatic precipitators according to claim 1, characterized in that, The slag receiving mechanism includes a fixed frame (6) and a slag receiving box (7). The fixed frame (6) is fixedly installed on the flue gas channel (1). The fixed frame (6) is adapted to the slag receiving box (7). Ear blocks (10) are fixedly installed on both sides of the slag receiving box (7). The fixed frame (6) has a placement slot (11) adapted to the ear blocks (10) at the corresponding position. A handle (9) is fixedly installed on both ear blocks (10).

5. The preflue device for electrostatic precipitators according to claim 1, wherein The sealing plate (8) is adapted to the exhaust port of the dust channel (1), and the side wall of the sealing plate (8) is inlaid with a sealing gasket (16).

6. The preflue device for electrostatic precipitators according to claim 4, characterized in that, The slag receiving box (7) is located directly below the waste discharge port of the flue gas channel (1).

7. The preflue device for electrostatic precipitators according to claim 1, characterized in that, A driven gear (19) is fixedly installed on the rotating shaft of the push plate (13), and an electric telescopic rod (21) is provided on the mounting frame (12). An active gear plate (20) is installed at the shaft output end of the electric telescopic rod (21), and the active gear plate (20) and the driven gear (19) are meshed.

8. The pre-flue device for an electrostatic precipitator according to claim 7, characterized in that, A protective chamber (17) is fixedly installed on the mounting frame (12). The electric telescopic rod (21), the active toothed plate (20), and the connection parts of the passive gear (19) and the active toothed plate (20) are all located inside the protective chamber (17).

9. The pre-flue device for an electrostatic precipitator according to claim 1, characterized in that, Rotating blocks (18) are rotatably installed on both sides of the sealing plate (8), and limiting frames (22) are fixedly installed on both sides of the dust channel (1) at corresponding positions. The limiting frames (22) are L-shaped and are located on the rotation path of the corresponding rotating blocks (18).

Images