Combined wet-type electric precipitation cathode wire
By employing a combined cathode wire in a wet electrostatic precipitator, and utilizing discharge spikes formed by multiple steel needles and spirally wound thin metal strips, the problem of poor capture effect of existing equipment under high concentrations of SO3 and ammonia aerosols has been solved, achieving highly efficient capture of fine particulate matter.
Patent Information
- Application Number
- CN202422488332.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-15
- Publication Date
- 2025-11-04
- Estimated Expiration
- 2034-10-15
AI Technical Summary
Existing wet electrostatic precipitators are ineffective at capturing dust and aerosols, especially fine particulate matter, in the presence of high concentrations of SO3 and ammonia aerosols, resulting in poor discharge performance.
A combined cathode wire is used, which forms discharge barbs of varying lengths by setting multiple vertical steel needles and spirally wound thin metal strips on the main body of the cathode wire, thereby increasing the electric field strength and current density and enhancing the capture effect of fine dust and aerosols.
It achieves effective capture of fine dust and aerosols under high electric field strength, improving charging efficiency and capture efficiency.
Smart Images
Figure CN223505432U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a combined wet electrostatic precipitator cathode wire, which is an environmental protection device and a facility for electrostatic precipitation of flue gas discharged from burners. Background Technology
[0002] In some coal-fired burners, electrostatic precipitators (ESPs) utilizing the principle of anodic adsorption are commonly used. These devices typically consist of multiple metal (or conductive non-metallic) tubes combined together as anodes, with a metal wire serving as the cathode at the center of each anode tube. When flue gas containing a large amount of dust and aerosols passes through the metal tubes, a power supply is applied between the anodes and cathodes, creating an electric field between the metal tubes and the cathode wire. This field adsorbs the dust and aerosols from the flue gas, and the metal tubes are periodically rinsed with water or other liquids—this is known as wet electrostatic precipitator. Existing wet ESPs use round wires, flat steel wires, or needle-punched wires for the cathode wires, resulting in a limited electrode configuration and poor discharge efficiency. When the flue gas contains high concentrations of SO3, ammonia, and other aerosols, the length of the discharge spikes limits the effectiveness of dust collection, especially aerosol capture, even with increased current density. Therefore, increasing the current density to achieve a stronger electric field and thus improve dust and aerosol collection is a problem that needs to be solved. Summary of the Invention
[0003] To overcome the problems of existing technologies, this invention proposes a combined wet electrostatic precipitator cathode wire. The cathode wire incorporates soft barbs compared to existing cathode wires, creating a high current density and high electric field strength, thus achieving effective capture of fine dust and aerosols.
[0004] The purpose of this utility model is achieved as follows: A combined wet electrostatic precipitator cathode wire includes: a cathode wire body installed in the center of multiple metal tubes serving as anodes; fixing facilities are provided at both ends of the cathode wire body; multiple steel needles for discharge are evenly arranged along the axial direction of the cathode wire body; the steel needles are perpendicular to the axis of the cathode wire body; a thin metal strip is spirally wound around the cathode wire body; the thin metal strip has discontinuous folded edges on both sides; the folded edges form barbs as the thin metal strip is wound around the cathode wire body.
[0005] Furthermore, the thin metal strip wound around the cathode wire body is a single-headed spiral or a double spiral.
[0006] Furthermore, the steel needles are evenly distributed in groups on the cathode wire body, and each group of steel needles has at least two different lengths.
[0007] Furthermore, the folded edge of the thin metal strip is triangular.
[0008] Furthermore, the folded edge of the thin metal strip is rectangular.
[0009] The advantages and beneficial effects of this utility model are as follows: The cathode wire of this utility model adopts a combined double helix cathode wire, that is, steel needles of different lengths are combined, and a thin metal strip is spirally wound between the steel needles. Barbs are punched on both sides of the thin metal strip. After being wound around the cathode metal wire, it is combined with the steel needles to form discharge barbs of matching length. Under the combination of high electric field strength and high current density, fine dust and aerosols in flue gas are effectively captured, so that the wet electrostatic precipitator can be used to the maximum extent. Attached Figure Description
[0010] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0011] Figure 1 This is a schematic diagram of the structure of the single metal tube anode and the single metal wire cathode of the device described in Embodiment 1 of this utility model;
[0012] Figure 2 This is a schematic diagram of the structure of the single metal tube anode and the single metal wire cathode of the device described in Embodiment 1 of this utility model. Figure 1 Sectional view along line AA;
[0013] Figure 3 This is a schematic diagram of the structure of the single metal tube anode and the single metal wire cathode of the device described in Embodiment 1 of this utility model. Figure 2 Enlarged view of point B;
[0014] Figure 4 This is a unfolded view of the thin metal strip with triangular barbs of the device described in Embodiments 1 and 5 of this utility model;
[0015] Figure 5 This is a unfolded view of the thin metal strip with rectangular barbs described in Embodiment 5 of this utility model. Detailed Implementation
[0016] Example 1:
[0017] This embodiment is a combined wet electrostatic precipitator cathode wire, such as... Figure 1 , 2 As shown in Figure 3. This embodiment includes: a cathode wire body 2, which is installed in the center of multiple metal tubes 1 serving as anodes; fixing devices 3 are provided at both ends of the cathode wire body; multiple steel needles 4 for discharge are evenly arranged along the axial direction of the cathode wire body; the steel needles are perpendicular to the axis of the cathode wire body; a thin metal strip 5 is spirally wound around the cathode wire body; the thin metal strip has discontinuous folded edges on both sides; the folded edges form barbs 501 as the thin metal strip is wound around the cathode wire body, such as... Figure 4 As shown.
[0018] The anode described in this embodiment is a bundle of multiple metal tubes. Figure 1 In this diagram, a single hexagon represents a tube acting as the anode, and six dashed hexagons represent the surrounding tubes, forming a tube bundle. The cross-sectional shape of each tube can be circular or other regular polygons. Figure 1 The diagram shows a honeycomb-like tube bundle composed of regular hexagons. A metal cathode wire is positioned along the central axis of each tube. The two ends of the cathode wire are fixedly connected to the metal tube by a fixing device. This device is insulated, allowing the positive and negative terminals of a power source to be connected respectively, creating an electric field within the tube.
[0019] The combined type described in this embodiment refers to a cathode wire body equipped with various forms of discharge facilities, including steel needles of different lengths and short barbs formed by winding thin metal strips around the cathode wire body. This combined spiral cathode wire can combine discharge facilities of different lengths to form soft barbs (steel needles) and hard barbs (thin metal strips with folded edges), matching the anode shape and size. This combination of rigid and flexible wires results in a high electric field strength, good discharge effect, no dead zones in the electric field, and a more uniform electric field distribution, which is beneficial for charging fine particles, improving charging efficiency, and enhancing the collection efficiency of ultrafine particles and fine mist droplets. Each group of discharge needles can consist of 3-6 long barbs and 6-8 short barbs, with the long barbs being 25-100mm in length and the short barbs being 25-50mm in length.
[0020] The metal strip can be made of steel or copper sheet with good ductility, and the winding method can be a single-ended spiral or a double-ended spiral. The folded edge can be triangular or rectangular, or a rectangle with multiple discharge tips at the top.
[0021] Example 2:
[0022] This embodiment is an improvement upon Embodiment 1, specifically a refinement of the thin metal strip described in Embodiment 1. The thin metal strip wound around the cathode wire body in this embodiment is a single-ended spiral or a double spiral.
[0023] The double-headed winding structure is somewhat complex, but the discharge ends generated by the winding are more uniform.
[0024] Example 3:
[0025] This embodiment is an improvement upon the above embodiment, refining the steel needles described therein. In this embodiment, the steel needles are evenly distributed in groups on the cathode wire body, and each group of steel needles has at least two different lengths, such as... Figure 3 In the middle, there are long steel needles 401 and short steel needles 402.
[0026] A set of steel needles of varying lengths are arranged around the circumference of the cathode wire body, perpendicular to the central axis of the cathode wire body, pointing towards the anode to form an electric field that adsorbs dust.
[0027] Example 4:
[0028] This embodiment is an improvement upon the above embodiment, specifically a refinement of the thin metal strip. The thin metal strip in this embodiment has a triangular folded edge (5011), as shown below. Figure 4 As shown.
[0029] The folded edge at the tip of the triangle formed after stamping has a good tip discharge effect.
[0030] Example 5:
[0031] This embodiment is an improvement upon the above embodiment, specifically a refinement of the thin metal strip. The folded edge of the thin metal strip in this embodiment is rectangular (5012), as shown below. Figure 5 As shown.
[0032] The tip of the straight edge also needs to be serrated to form a discharge tip, such as... Figure 5 Two pointed teeth are set in the middle.
[0033] Finally, it should be noted that the above is only used to illustrate the technical solution of this utility model and not to limit it. Although this utility model has been described in detail with reference to the preferred arrangement, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model (such as the cross-sectional shape of the anode, the cross-sectional shape of the cathode, and the installation method, etc.) without departing from the spirit and scope of the technical solution of this utility model.
Claims
1. A combined wet electrostatic precipitator cathode wire, comprising: A cathode wire body is installed in the center of multiple metal tubes that serve as anodes. Fixing facilities are provided at both ends of the cathode wire body. Multiple steel needles for discharge are evenly arranged along the axial direction of the cathode wire body. The steel needles are perpendicular to the axis of the cathode wire body. The characteristic feature is that a thin metal strip is wound around the cathode wire body in a spiral. The thin metal strip has discontinuous folded edges on both sides. The folded edges form barbs as the thin metal strip is wound around the cathode wire body.
2. The cathode wire according to claim 1, characterized in that, The thin metal strip wound around the cathode wire body is a single-headed spiral or a double spiral.
3. The cathode wire according to claim 2, characterized in that, The steel needles are evenly distributed in groups on the cathode wire body, and each group of steel needles has at least two lengths.
4. The cathode wire according to claim 3, characterized in that, The thin metal strip has a triangular folded edge.
5. The cathode wire according to claim 3, characterized in that, The thin metal strip has a rectangular folded edge.