A wet electrostatic precipitator

Abstract

This utility model discloses a wet electrostatic precipitator, relating to the technical field of wet electrostatic precipitators. It includes a housing containing several electric fields, with a flushing water system corresponding to each field. The flushing water system includes a water supply network with several nozzles evenly distributed on it. The inner nozzles have a spray angle of 90°, and the outermost nozzles have a spray angle of 30°. Setting the spray angle of the outermost nozzles to 30° allows for precise control of the flushing range. During flushing of each electric field, the water flow does not interfere with adjacent operating electric fields. The wet electrostatic precipitator can operate continuously without power interruption, achieving high dust removal efficiency. By eliminating the partitions, maintenance personnel can directly enter from one electric field to another without disassembling any structure, shortening maintenance time and reducing labor intensity. The electric fields have good interconnectivity, reducing flue gas flow resistance. Eliminating the partitions and related sealing structures prevents the accumulation of pollutants, resulting in excellent flushing performance and reduced equipment costs.

Description

Technical Field

[0001] This utility model relates to the technical field of wet electrostatic precipitators, and in particular to a wet electrostatic precipitator. Background Technology

[0002] Wet electrostatic precipitators are key equipment for controlling pollutants such as fine particulate matter (PM2.5), SO3 acid mist, and heavy metals. To ensure the continuous and stable operation of wet electrostatic precipitators, the collecting electrodes need to be washed regularly. Currently, the industry commonly adopts a zoned washing mode, where multiple electric fields are washed one by one while the others remain operational. However, the traditional zoned washing scheme has a significant drawback: because water is prone to splashing during the washing process, fixed partitions need to be installed between the electric fields to prevent the washing water from the washing electric fields from splashing into adjacent operating electric fields. The presence of these partitions leads to the following problems: 1. Poor electric field interconnection: The partition divides the internal space of the wet electrical equipment into independent areas, making it impossible for maintenance personnel to move quickly through the channels between electric fields. It is necessary to disassemble and reassemble the equipment shell multiple times to complete cross-electric field maintenance, which greatly increases maintenance time and labor intensity. 2. Increased airflow resistance: The baffle will interfere with the uniform distribution of flue gas inside the wet electrostatic precipitator, generating local eddies and airflow obstruction, which will lead to increased fan energy consumption and may also cause a decrease in dust collection efficiency in some areas, affecting the overall dust removal efficiency. 3. Increased equipment costs: The processing, installation and subsequent maintenance of the baffles require additional investment, and the baffles are susceptible to corrosion by acidic flushing water during long-term operation, requiring regular replacement, which further increases the equipment operation and maintenance costs. 4. Limited rinsing effect: Some of the partitions and the sealing areas of the inner wall of the electric field are prone to accumulating pollutants, forming secondary dust, which reduces the purification effect.

[0003] Therefore, developing a wet electrostatic precipitator that can achieve safe partitioned rinsing without the need for partitions has become a key requirement to address the pain points of existing technologies. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a wet electrostatic precipitator that overcomes the shortcomings of the above-mentioned defects, such as poor electric field interconnection, increased airflow resistance, increased equipment cost, and limited rinsing effect; and achieves the purpose of good electric field interconnection, reduced airflow resistance, reduced equipment cost, and good rinsing effect.

[0005] To solve the above-mentioned technical problems, the technical solution of this utility model is as follows: a wet electrostatic precipitator, including a shell, a plurality of electric fields are provided inside the shell, and a flushing water system is provided above the plurality of electric fields. The flushing water system includes a water supply network, and a plurality of nozzles are evenly provided on the water supply network. The spray angle of the inner nozzles is 90° and the spray angle of the outermost nozzles is 30°.

[0006] Furthermore, the electric field includes a corona electrode assembly and a dust collection electrode assembly. The dust collection electrode assembly includes a lower dust collection electrode frame, an upper dust collection electrode frame, and a plurality of dust collection tubes arranged sequentially. The dust collection tubes are fixedly arranged between the upper dust collection electrode frame and the lower dust collection electrode frame.

[0007] Furthermore, the corona electrode assembly includes a corona electrode, an upper corona electrode frame, and a lower corona electrode frame. The corona electrode is disposed in the dust collection pipe and is fixedly disposed between the upper corona electrode frame and the lower corona electrode frame. The upper corona electrode frame is disposed above the upper dust collection electrode frame, and the lower corona electrode frame is disposed below the lower dust collection electrode frame.

[0008] Furthermore, the nozzle is positioned above the corresponding dust collection pipe, which is a hexagonal honeycomb tube with an inner diameter of 300mm.

[0009] Furthermore, the corona electrode is made of barbed wire, and the electrode distance between the corona electrode and the dust collection tube is 150mm.

[0010] Furthermore, the top of the housing is provided with an air outlet, and the bottom of the housing is provided with an air inlet.

[0011] Furthermore, the electric field has a height of 4m and a width of 3m.

[0012] Furthermore, a guide plate is provided below the electric field, and the guide plate is fixedly connected to the shell. The height of the guide plate is 10-15cm.

[0013] Furthermore, the flushing water system also includes control valves; The water supply network is made of 304 stainless steel. The nozzle has a rated flow rate of 15-20 L / min and a working pressure of 0.3-0.5 MPa.

[0014] Furthermore, an insulating box is provided on the top of the housing; The casing has an inspection port.

[0015] This utility model adopts the above technical solution and has the following advantages compared with the prior art: the spray angle of the outermost nozzle is set to 30°, which can accurately control the rinsing range. The water flow will not interfere with the adjacent operating electric fields when rinsing each electric field. The wet electrostatic precipitator can achieve continuous operation without power interruption, which solves the problem of frequent start and stop of electric fields caused by rinsing and has good dust removal efficiency. After eliminating the partition, a through space is formed between adjacent electric fields. Maintenance personnel can directly enter one electric field from another without disassembling any structure, which shortens maintenance time, reduces labor intensity, and improves the interconnectivity of electric fields. At the same time, the through electric field structure reduces the resistance of flue gas flow. The elimination of partitions and related sealing structures eliminates pollutants that are easy to accumulate, resulting in good rinsing effect and reduced equipment cost. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a wet electrostatic precipitator according to an embodiment of the present utility model; Figure 2 This is a schematic diagram of the corona electrode assembly and the dust collection electrode assembly in the embodiments of this utility model.

[0017] In the diagram: 1-Insulation box, 2-Air outlet, 3-Shell, 4-Flushing water system, 5-Water supply network, 6-Nozzle, 7-Air inlet, 8-Guide plate, 9-Corona electrode assembly, 10-Dust collecting electrode assembly, 11-Dust collecting pipe, 12-Corona electrode, 13-Upper frame of corona electrode, 14-Lower frame of corona electrode, 15-Upper frame of dust collecting electrode, 16-Lower frame of dust collecting electrode, 17-Control valve. Detailed Implementation

[0018] The specific embodiments of this utility model will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding of this utility model, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0019] Examples, such as Figure 1-2 As shown, a wet electrostatic precipitator includes a housing 3, which contains several electric fields (3 in this example), with a height of 4m and a width of 3m. A flushing water system 4 is provided above the electric fields. An air outlet 2 is provided at the top of the housing 3, and an air inlet 7 is provided at the bottom of the housing 3.

[0020] The electric field includes a corona electrode assembly 9 and a dust collection electrode assembly 10. The dust collection electrode assembly 10 includes a lower dust collection electrode frame 16, an upper dust collection electrode frame 15, and several dust collection tubes 11 arranged sequentially. The dust collection tubes 11 are hexagonal honeycomb tubes with an inner diameter of 300 mm. The upper end of the dust collection tube 11 is fixedly connected to the upper dust collection electrode frame 15, and the lower end of the dust collection tube 11 is fixedly connected to the lower dust collection electrode frame 16.

[0021] The corona electrode assembly 9 includes a corona electrode 12, an upper corona electrode frame 13, and a lower corona electrode frame 14. The corona electrode 12 uses barbed wire and is disposed in the dust collection pipe 11. The electrode distance between the corona electrode 12 and the dust collection pipe 11 is 150mm. The upper end of the corona electrode 12 is fixedly connected to the upper corona electrode frame 13, and the lower end of the corona electrode 12 is fixedly connected to the lower corona electrode frame 14. The upper corona electrode frame 13 is disposed above the upper dust collection electrode frame 15, and the lower corona electrode frame 14 is disposed below the lower dust collection electrode frame 16.

[0022] The flushing water system 4 includes a water supply network 5, on which several nozzles 6 are evenly arranged. The nozzles 6 are positioned above the corresponding dust collection pipes 11. The spray angle of the inner nozzles 6 is 90°, and the spray angle of the outermost nozzles 6 is 30°, so that the spray range of the flushing water is precisely controlled within the current flushing electric field, avoiding the flushing water from being sprayed into adjacent electric fields and spreading and splashing.

[0023] The flushing water system 4 also includes a control valve 17.

[0024] Water supply network 5 is made of 304 stainless steel.

[0025] The rated flow rate and working pressure of the nozzle 6 can be adjusted according to the size of the electric field and the area of ​​the dust collection pipe 11 to avoid overflow of flushing water due to excessive flow rate or splashing of water mist due to excessive pressure. The rated flow rate of the nozzle 6 is 15-20L / min and the working pressure is 0.3-0.5MPa. In this example, the rated flow rate of the nozzle 6 is 18L / min and the working pressure is 0.4MPa.

[0026] A guide plate 8 is provided below the electric field. The guide plate 8 is fixedly connected to the shell 3. The height of the guide plate 8 is 10-15cm. The guide plate 8 is used to guide the flue gas to flow smoothly through the electric field, ensuring that the flue gas can enter the entire cross-section of the electric field evenly, and avoiding eddy currents or short circuits.

[0027] The insulation box 1, the flow guide plate 8, and the water supply network 5 are existing technologies and will not be described in detail here.

[0028] The housing 3 is provided with an inspection port (not shown in the figure) for daily inspection, periodic maintenance and troubleshooting of the dust collector's interior.

[0029] The top of the housing 3 is provided with several insulating boxes 1. The insulating boxes 1 are known technology and will not be described in detail here.

[0030] Working principle: When the high-voltage power supply of the electric field is turned on, the flue gas enters the wet electrostatic precipitator through the air inlet 7 and flows through the guide plate 8 to make the flue gas evenly enter the entire electric field. The high voltage increases the electric field strength of the corona electrode 12, causing the surrounding gas molecules to ionize and generate a large number of free electrons and negative ions. When the dust particles, acid mist droplets and other pollutants in the flue gas flow through this strong ionization area, they will collide with the free electrons and negative ions and adsorb these negatively charged particles. Under the action of the high-voltage electrostatic field, they will collide and be adsorbed on the surface of the dust collection tube 11.

[0031] When a certain electric field needs to be flushed, the control valve 17 of the corresponding flushing water system 4 is opened, while the other electric fields remain running. Water forms a downward-flowing, uniform, and continuous water film on the surface of the dust collection pipe 11. When charged particles are captured on the surface of the dust collection pipe 11, they are immediately flushed away by this downward-flowing water film, completely avoiding the problem of secondary dust re-entrainment.

[0032] When a certain electric field needs maintenance, the high-voltage power supply and flushing water system 4 of that electric field are shut off. Maintenance personnel enter the wet electrostatic precipitator through the maintenance port. Since there are no partitions to block the way, they can directly reach the electric field that needs maintenance to carry out maintenance work without disassembling any structure. After the maintenance is completed, the electric field can be restored to operation.

[0033] Setting the spray angle of the outermost nozzle 6 to 30° allows for precise control of the rinsing range. Water flow does not interfere with adjacent operating electric fields during rinsing, enabling continuous operation of the wet electrostatic precipitator without power interruption. This solves the problem of frequent start-stop cycles caused by rinsing, resulting in high dust removal efficiency. Eliminating the partitions creates a continuous space between adjacent electric fields, allowing maintenance personnel to directly access one field from another without disassembling any structure, shortening maintenance time, reducing labor intensity, and improving electric field interconnectivity. The continuous electric field structure also reduces flue gas flow resistance. Eliminating partitions and related sealing structures eliminates easily accumulated pollutants, resulting in excellent rinsing performance and reduced equipment costs.

[0034] The embodiments of this utility model have been described in detail above with reference to the accompanying drawings, but this utility model is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this utility model, and these variations still fall within the protection scope of this utility model.

Claims

1. A wet electrostatic precipitator characterized by: The system includes a housing (3), which contains several electric fields. A flushing water system (4) is provided above the electric fields. The flushing water system (4) includes a water supply network (5). Several nozzles (6) are evenly provided on the water supply network (5). The spray angle of the inner nozzle (6) is 90°, and the spray angle of the outermost nozzle (6) is 30°.

2. The wet electrostatic precipitator of claim 1, wherein: The electric field includes a corona electrode assembly (9) and a dust collection electrode assembly (10). The dust collection electrode assembly (10) includes a lower dust collection electrode frame (16), an upper dust collection electrode frame (15), and a number of dust collection tubes (11) arranged in sequence. The dust collection tubes (11) are fixedly arranged between the upper dust collection electrode frame (15) and the lower dust collection electrode frame (16).

3. The wet electrostatic precipitator of claim 2, wherein: The corona electrode assembly (9) includes a corona electrode (12), an upper corona electrode frame (13), and a lower corona electrode frame (14). The corona electrode (12) is disposed in the dust collection pipe (11). The corona electrode (12) is fixedly disposed between the upper corona electrode frame (13) and the lower corona electrode frame (14). The upper corona electrode frame (13) is disposed above the upper dust collection electrode frame (15), and the lower corona electrode frame (14) is disposed below the lower dust collection electrode frame (16).

4. The wet electrostatic precipitator of claim 2, wherein: The nozzle (6) is positioned above the corresponding dust collection pipe (11), which is a hexagonal honeycomb tube with an inner diameter of 300 mm.

5. The wet electrostatic precipitator of claim 3, wherein: The corona electrode (12) is made of barbed wire, and the electrode distance between the corona electrode (12) and the dust collection tube (11) is 150mm.

6. The wet electrostatic precipitator of claim 1 wherein: The top of the housing (3) is provided with an air outlet (2), and the bottom of the housing (3) is provided with an air inlet (7).

7. The wet electrostatic precipitator of claim 1 wherein: The electric field has a height of 4m and a width of 3m.

8. The wet electrostatic precipitator of claim 1 wherein: A guide plate (8) is provided below the electric field. The guide plate (8) is fixedly connected to the shell (3). The height of the guide plate (8) is 10-15cm.

9. The wet electrostatic precipitator of claim 1 wherein: The flushing water system (4) also includes a control valve (17); The water supply network (5) is made of 304 stainless steel; The rated flow rate of the nozzle (6) is 15-20 L / min, and the working pressure is 0.3-0.5 MPa.

10. The wet electrostatic precipitator of claim 1 wherein: An insulating box (1) is provided on the top of the housing (3); The housing (3) is provided with an inspection port.

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