Electrostatic dust collection device

Abstract

The present disclosure relates to an electrostatic precipitation device. The electrostatic dust collection device comprises a plurality of positive electrode plates and a plurality of negative electrode plates, the positive electrode plates and the negative electrode plates are alternately arranged at intervals, the positive electrode plates are communicated with the positive electrode of the high-voltage power supply, and the negative electrode plates are communicated with the negative electrode of the high-voltage power supply. At least two adjacent electrode plates are formed by wrapping conductive materials with insulating materials, at least one of the two adjacent electrode plates is provided with exposed conductive materials, the exposed conductive materials are located in an effective working area or located outside the effective working area, and the distance between the exposed conductive materials and the effective working area is smaller than or equal to 10 mm. If the two adjacent electrode plates both have exposed conductive materials, the distance between the exposed conductive materials on the two adjacent electrode plates in the direction perpendicular to the distance between the electrode plates is larger than or equal to the minimum distance between the electrode plates, and the effective working area refers to an area which is located between the two adjacent electrode plates and through which unpurified gas can flow. Therefore, normal operation can be ensured when high voltage is applied to the conductive materials of the adjacent electrodes, and meanwhile, the long-term operation efficiency of the electrostatic dust collection device can be well maintained.

Description

Technical Field

[0001] The present disclosure relates to the technical field of electrostatic dust removal, and in particular to an electrostatic dust collecting device. Background Art

[0002] Electrostatic precipitators have been widely used and developed due to their advantages such as low wind resistance and repeated cleaning and use.

[0003] The electrostatic dust collector in the electrostatic precipitator is composed of discharge plates and dust collecting plates arranged alternately in parallel to form a strong electrostatic field to collect dust. The plate is the core component of the electrostatic dust collector. Its material and structure determine the purification capacity, cost, life, by-products, reliability, safety, etc. of the dust collector.

[0004] Air has a withstand voltage limit, which varies with air humidity and is also related to the flatness and surface finish of the plates of the electrostatic dust collector. It is generally believed that the withstand voltage of air is 3KV per millimeter. When the inter-electrode voltage exceeds this voltage, the air will be broken down. When designing air filters, conductive materials are usually used as electrode plates. Due to many reasons such as environmental changes, processing technology, and dust adsorption, the voltage that can be applied between the plates is usually only half of the air withstand voltage. Some new processes can improve this data, but the voltage that can be applied in the end cannot exceed the air withstand voltage.

[0005] The dust collector composed of conductive material plates wrapped with insulating materials (hereinafter referred to as "strong electric field solution") is one of the current mainstream electrostatic dust collection device solutions. Because its conductive electrodes are wrapped with insulating materials and are not exposed to the air, it can ensure that even when a voltage higher than the air withstand voltage is applied, there will be no air breakdown. The insulating material wraps the conductive material plate, and the voltage that can be applied to the electrode has nothing to do with the air withstand voltage, but only with the withstand voltage of the insulating material. Commonly used insulating materials, such as PP (Polypropylene), PET (Polyethylene Terephthalate), ABS (Acrylonitrile Butadiene Styrene), PC (Polycarbonate), etc., 0.1mm thick insulating materials can withstand thousands of volts of high voltage, which is much higher than the 3kv / mm of air. Therefore, the dust collector using the strong electric field solution can apply a higher voltage to the electrode.

[0006] A dust collector with a voltage higher than the withstand voltage of the air medium can be called a strong electric field electrostatic dust collector. Because the voltage applied to the air is positively correlated with the purification efficiency, the higher the voltage, the higher the purification efficiency. Therefore, the strong electric field electrostatic dust collector has a higher purification efficiency and a smaller size. In addition, due to the wrapping of the insulating material, the strong electric field electrostatic dust collector has an extremely low operating current and does not produce ozone, and has very excellent performance characteristics.

[0007] However, it is precisely because of the use of insulating materials that this type of dust collector also has obvious performance defects. That is, it is greatly affected by the air pressure resistance, resulting in a rapid performance degradation. This is because the air pressure resistance between parallel electrodes is not constant. The insulation of the electrode surface is destroyed due to the adsorption of pollutants, which reduces the air pressure resistance between the electrodes. The reduction in the electric field strength between the electrodes will directly lead to a decrease in the performance of the electrostatic dust collector.

[0008] Therefore, there is a need for a strong electric field electrostatic dust collector that can maintain a high purification efficiency for a long time. Summary of the invention

[0009] A technical problem to be solved by the present disclosure is how to design a strong electric field electrostatic dust collection device that can maintain a high purification efficiency for a long time.

[0010] According to the first aspect of the present disclosure, an electrostatic dust collection device is provided, comprising: a plurality of positive electrode plates and a plurality of negative electrode plates, the plurality of positive electrode plates and the plurality of negative electrode plates being arranged alternately at intervals, the positive electrode plates being connected to the positive pole of a high-voltage power supply, and the negative electrode plates being connected to the negative pole of the high-voltage power supply; at least two adjacent electrode plates are both composed of a conductive material wrapped in an insulating material, at least one of the two adjacent electrode plates has exposed conductive material, the exposed conductive material is located within an effective working area, or the exposed conductive material is located outside the effective working area and the distance between the exposed conductive material and the effective working area is less than or equal to 10 mm, and if the exposed conductive material exists on both of the two adjacent electrode plates, the distance between the exposed conductive materials on the two adjacent electrode plates in a direction perpendicular to the electrode plate spacing is greater than or equal to the minimum electrode plate spacing, and the effective working area refers to an area between two adjacent electrode plates through which unpurified gas can flow.

[0011] Optionally, if the exposed conductive material is located outside the effective working area, the distance between the exposed conductive material and the effective working area is less than or equal to 5 mm.

[0012] Optionally, the exposed conductive material is located in an effective working area.

[0013] Optionally, the exposed conductive material is a connecting portion between the electrode plate and the high voltage power supply.

[0014] Optionally, the electrostatic dust collecting device further comprises: a first frame, wherein the first frame is configured to avoid a connection portion between the electrode plate and the high voltage power supply so that the connection portion is located within the effective working area.

[0015] Optionally, the electrostatic dust collection device also includes: a second frame, the second frame is configured to shield the first connection part between the electrode plate and the high-voltage power supply so that the first connection part is located outside the effective working area, the connection part between the electrode plate and the high-voltage power supply includes the first connection part and the second connection part, the second connection part is connected to the first connection part and extends from the first connection part into the effective working area, and the exposed conductive material is the second connection part.

[0016] Optionally, at least one of the two adjacent electrode plates is configured to lead out a section of the exposed conductive material from at least one position on the opposite side or at least one side, the electrode plate includes two surfaces, two side surfaces, a connecting surface and an opposite side, the distance between the two mutually close surfaces of the two adjacent electrode plates is the electrode plate spacing, the connecting surface refers to the surface where the connecting part of the electrode plate and the high-voltage power supply is located, the opposite side refers to the surface parallel to the connecting surface, and the connecting surface is located outside the effective working area.

[0017] Optionally, the two adjacent electrode plates are configured to respectively lead out at least one section of the exposed conductive material from different sides of the two adjacent electrode plates.

[0018] Optionally, the two adjacent electrode plates are configured to respectively lead out at least one section of the exposed conductive material from the same side of the two adjacent electrode plates, and the distance between the exposed conductive materials led out from the same side of the two adjacent electrode plates in the length direction of the electrode plates is greater than or equal to the minimum electrode plate spacing.

[0019] Optionally, the two adjacent electrode plates are configured such that the internal conductive material is exposed at at least one position on the electrode surface of one of the electrode plates, at least one section of exposed conductive material is led out on the opposite side or side of the other electrode plate, or the internal conductive material is exposed at at least one position on the electrode surface of the other electrode plate, and the distance between the exposed conductive materials of the two adjacent electrode plates in the direction perpendicular to the electrode plate spacing is equal to or equal to the minimum electrode plate spacing, the electrode plate comprises two surfaces, two side surfaces, a connecting surface and an opposite surface, the distance between the two adjacent surfaces of the two adjacent electrode plates being close to each other is the electrode plate spacing, the connecting surface refers to the surface where the connecting part of the electrode plate and the high-voltage power supply is located, the opposite surface refers to a surface parallel to the connecting surface, and the connecting surface is located outside the effective working area.

[0020] The present disclosure configures an electrostatic dust collector in which at least two adjacent electrode plates, both of which are made of conductive materials wrapped by insulating materials, are configured such that at least one electrode plate has exposed conductive materials, and the exposed conductive materials are located in the effective working area, or the exposed conductive materials are located outside the effective working area and the distance between the exposed conductive materials and the effective working area is less than or equal to 10 mm. Thus, during the working process, pollutants adsorbed onto the insulating materials on the surface of the insulating electrode will be connected to the high-voltage power supply under the action of the exposed conductive materials, which enables the conductive pollutants on the electrode surface to be driven by the power supply, thereby being able to well maintain the long-term operating efficiency of the electrostatic dust collector. Furthermore, if there are exposed conductive materials on both adjacent electrode plates, the exposed conductive materials on the two adjacent electrode plates are not directly opposite, that is, the distance between the exposed conductive materials on the two adjacent electrode plates in the direction perpendicular to the electrode plate spacing is greater than or equal to the minimum electrode plate spacing, so that the direct discharge and sparking can be avoided, so that the device can work normally even when a high voltage is applied to the conductive materials of the adjacent electrodes. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and other objects, features and advantages of the present disclosure will become more apparent through a more detailed description of exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components in the exemplary embodiments of the present disclosure.

[0022] Figure 1 is a schematic side cross-sectional view showing an insulated electrode.

[0023] Figure 2 is a schematic top cross-sectional view showing an insulated electrode.

[0024] Figure 3 It shows that based on Figure 1 , Figure 2 A schematic top cross-sectional view of an electrode plate made of insulated electrodes is shown.

[0025] Figure 4 It is a schematic diagram showing a conventional working state of an electrostatic dust collector.

[0026] Figure 5 Schematic diagram showing the principle of formation of reverse electric field.

[0027] Figure 6 is a schematic diagram showing electrodes on which pollutants are adsorbed.

[0028] Figure 7 It is a schematic diagram showing the effective working area when a frame (ie, a second frame) is set outside the electrode.

[0029] Figure 8 Schematic diagram showing the effective working area based on the transformed external frame (ie, the first frame).

[0030] Fig. 9A is a schematic side cross-sectional view showing an electrode plate.

[0031] Fig. 9B is a schematic top view showing an electrode plate.

[0032] Fig.10 Schematic diagram showing the structure of two adjacent electrode plates.

[0033] Fig.11A is a schematic side cross-sectional view showing another electrode plate.

[0034] Fig. 11B is a schematic top cross-sectional view showing another electrode plate.

[0035] Fig.12 is a schematic top-view cross-sectional diagram showing two adjacent electrode plates.

[0036] Fig.13A is another schematic top-view cross-sectional view of two adjacent electrode plates.

[0037] Fig. 13B It shows that based on Fig.13A Schematic diagram of the arrangement structure of the electrode plates configured as shown.

[0038] Fig.14 is another schematic top view cross-sectional view showing two adjacent electrode plates.

[0039] Fig.15 is another schematic top-view cross-sectional view of two adjacent electrode plates.

[0040] Fig.16A is a schematic side cross-sectional view showing another electrode plate.

[0041] Fig. 16B is a schematic top cross-sectional view showing another electrode plate.

[0042] Fig.17 is another schematic diagram showing the structure of two adjacent electrode plates.

[0043] Fig.18 The figure shows a schematic diagram of the structure of an electrostatic dust removal device.

[0044] Fig.19 The figure shows a schematic diagram of the arrangement structure of electrode plates in an electrostatic precipitator.

[0045] Fig. 20 It is a schematic diagram showing the structure of another electrostatic precipitator. DETAILED DESCRIPTION

[0046] The preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to make the present disclosure more thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art.

[0047] A complete electrostatic precipitator needs to include two parts: a charging device and a dust collecting device. The function of the charging device is to charge the fine particles in the air and make them charged. The dust collecting device absorbs the charged particles through the electrostatic field to achieve the effect of air purification. The present disclosure only involves improvements to the dust collecting device, but not to the charging device. Therefore, the present disclosure does not describe the charging device, but focuses on the dust collecting device. It should be known that the dust collecting device (i.e., the electrostatic dust collecting device) described in the present disclosure can be used in conjunction with the charging device to form a complete electrostatic precipitator. In other words, the electrostatic dust collecting device described in the present disclosure may also include a charging device to form a complete electrostatic precipitator. In addition, some of the test cases mentioned in the article are by default the results of tests with the charging device.

[0048] In this disclosure, the terms "electrode" and "electrode plate" may be used interchangeably.

[0049] First, the present disclosure demonstrates the defects of the strong electric field solution through experiments.

[0050] The strong electric field solution means that both the positive and negative electrodes of the dust collector are wrapped with conductive material plates using insulating materials.

[0051] The traditional ESP solution means that both the positive and negative electrodes of the dust collector use conductive material plates.

[0052] The experiment content is as follows: Use a filter with a size of 300*250mm, a thickness of 40mm, and a sheet spacing of 1.5mm, respectively, use a strong electric field solution and a traditional ESP solution, place the filters using the two different solutions in the air purifier, and test the CADR (Clean Air Delivery Rate). The test results are as follows.

[0053] Strong electric field solution ESP Program CADR(m3 / h) 312 247

[0054] It can be seen that the initial CADR of the strong electric field solution is significantly better than that of the traditional ESP solution.

[0055] The present disclosure also uses the particle cumulative net content test method in Appendix C of the GB / T 18801-2022 Air Purifier standard to accelerate aging of the filters of the above two schemes by loading cigarette combustion products to observe changes in their purification capabilities. The specific test results are as follows.

[0056] Strong electric field solution ESP Program Initial CADR (m3 / h) 312 247 Loading 50 cigarettes CADR (m3 / h) 187 228 Loading 100 cigarettes CADR (m3 / h) 134 230

[0057] It can be seen that the initial purification efficiency of the strong electric field solution is very high, but its purification capacity decays quickly. After a period of use, the performance is not as good as the traditional ESP solution. Therefore, it is necessary to improve the long-term operating performance of the strong electric field electrostatic precipitator.

[0058] In view of this, the present disclosure proposes an electrostatic dust collector, which can maintain a high purification efficiency without too much performance drop when the air withstand voltage drops due to contamination of the insulating electrode.

[0059] The electrostatic dust collector comprises a plurality of positive electrode plates and a plurality of negative electrode plates, which are arranged alternately and spaced apart, the positive electrode plates are connected to the positive pole of a high-voltage power supply, and the negative electrode plates are connected to the negative pole of the high-voltage power supply.

[0060] At least two adjacent electrode plates among the multiple positive electrode plates and the multiple negative electrode plates are composed of conductive materials wrapped in insulating materials. That is, there may be at least one group of insulating electrodes among the multiple positive electrode plates and the multiple negative electrode plates. Exemplarily, all positive electrode plates and all negative electrode plates may be insulating electrodes. Among them, the insulating material may be but is not limited to PP (Polypropylene), PET (Polyethylene Terephthalate), ABS (Acrylonitrile Butadiene Styrene), PC (Polycarbonate), etc. The thickness of the insulating material (i.e., the thickness of the insulating layer) can be flexibly set according to actual conditions.

[0061] For the convenience of description, the electrode made of insulating material wrapped with conductive material is referred to as "insulated electrode" below.

[0062] Figure 1 is a schematic side cross-sectional view showing an insulated electrode.

[0063] Figure 2 is a schematic top cross-sectional view showing an insulated electrode.

[0064] See also Figure 1 , Figure 2, the insulated electrode is divided into two layers from the inside to the outside. The inner layer, that is, the middle part (the red part shown in the figure) is the conductive layer. The outer layer (the orange part shown in the figure) is the insulating layer.

[0065] Figure 3 It shows that based on Figure 1 , Figure 2 A schematic top cross-sectional view of an electrode plate made of insulated electrodes is shown.

[0066] like Figure 3 As shown, the conductive layer of the electrode plate is led out in at least one direction to be connected to a power source. The portion of the conductive layer of the electrode plate that is led out in one direction and used to connect to a power source can be referred to as a connecting portion.

[0067] Figure 4 It is a schematic diagram showing a conventional working state of an electrostatic dust collector.

[0068] See also Figure 4 , the positive and negative electrodes are arranged at intervals. Both the positive and negative electrodes are insulated electrodes. The conductive material inside the positive electrode group is connected to the positive electrode of the power supply on one side, and the conductive material inside the negative electrode group is connected to the negative electrode of the power supply on the other side. When two adjacent electrodes are respectively loaded with high voltages of the positive and negative electrodes of the power supply, there is a strong electrostatic field between the two adjacent electrodes (the overlapping area of ​​the conductive material inside the insulated electrodes). The area where the electrostatic field exists is the working area of ​​the electrostatic precipitator (i.e. Figure 4 In practical applications, Figure 4 Only a portion of the working area shown may belong to the effective working area. The effective working area (also called the effective purification area) refers to the area between two adjacent electrode plates through which the unpurified gas can flow. For example, see the following combined Figure 7 According to the description, only the portion where adjacent electrodes are aligned with each other belongs to the effective working area, and the connection portion between the electrode plate and the high voltage power supply is located outside the effective working area.

[0069] Figure 5 Schematic diagram showing the principle of formation of reverse electric field.

[0070] See also Figure 5 During the operation of the electrostatic dust filter, pollutants that flow into the effective working area with the air will carry charges, and these charges will be adsorbed on the electrode surface with the opposite polarity to their electrode under the action of the electric field. Since the electrode surface is an insulating material, these reverse charges will be enriched on the insulating material surface, eventually forming a reverse electric field.

[0071] Figure 6 is a schematic diagram showing electrodes on which pollutants are adsorbed.

[0072] See also Figure 6 , when the electrostatic dust filter is working, pollutants will be enriched on the surface of the effective working area. Figure 6 The blue part on the surface of the insulating layer is the pollutant attached to the surface of the insulating layer. Pollutants in the air usually contain conductive substances. For example, among the standard pollutants specified in GB14295, carbon black is a conductive substance. In actual work, ester substances, metal powders, etc. in the air also have certain conductive properties. As more and more conductive pollutants are enriched, the insulation of the electrode surface will be gradually destroyed, resulting in a decrease in the air withstand voltage. The decrease in the air withstand voltage will also form a reverse electric field with the opposite polarity to the voltage inside the electrode on the pollutants outside the insulating material on the electrode surface, thereby weakening the electric field strength between the filter poles (i.e., between the electrodes).

[0073] The reverse electric field on the electrode surface has the greatest impact on the efficiency of the electrostatic precipitator when it is completely insulated from the electrode power supply. However, if the power supply is connected to the surface contaminants, the performance degradation can be greatly reduced. The connection mentioned here refers to the connection in a broad sense, including direct and indirect connection between the conductive contaminants and the power supply.

[0074] With respect to at least two adjacent electrode plates in an electrostatic precipitator that are both insulating electrodes, the present disclosure aims to configure at least one of the two adjacent electrode plates to have exposed conductive material, and the exposed conductive material is located within the effective working area, or the exposed conductive material is located outside the effective working area and close to the effective working area, and close to the effective working area means that the distance between the exposed conductive material and the effective working area is less than or equal to 10 mm, and if there is exposed conductive material on both of the two adjacent electrode plates, the exposed conductive materials on the two adjacent electrode plates are not directly opposite. Not directly opposite means that the distance between the exposed conductive materials on the two adjacent electrode plates in the direction perpendicular to the electrode plate spacing must be greater than or equal to the minimum electrode plate spacing. The minimum electrode plate spacing refers to the minimum value of the distance between all two adjacent electrode plates in the electrostatic precipitator, that is, the minimum sheet spacing between the positive and negative electrodes. The distance between different electrode plates in the same electrostatic precipitator may be the same or different. Moreover, different electrostatic precipitators may have different minimum electrode plate spacings. In some embodiments, the distance of the exposed conductive material in the direction perpendicular to the plate spacing is generally much greater than the minimum plate spacing, such as 2.5 times, 5 times, 12 times, etc.

[0075] There may be one or more groups of electrode plates in the electrostatic precipitator, all of which use insulated electrodes. Each group of electrode plates consists of two adjacent electrode plates. The present disclosure may modify only some of the groups of electrode plates, or may modify all of the groups of electrode plates, and configure them so that at least one electrode plate has exposed conductive material, the exposed conductive material is located within the effective working area, or the exposed conductive material is located outside the effective working area and close to the effective working area, and if two adjacent electrode plates both have exposed conductive material, the exposed conductive materials on the two adjacent electrode plates are not facing each other.

[0076] The exposed conductive material is connected to the conductive layer inside the insulated electrode. By arranging the exposed conductive material in the effective working area, the conductive pollutants on the surface of the electrode can be connected to the power supply through the exposed conductive material, and then driven by the power supply, so that the long-term operation efficiency of the electrostatic dust collector can be well maintained. At the same time, due to the high voltage applied by the conductive materials of adjacent electrodes, they can only work normally when protected by insulation wrapping. Therefore, when there is exposed conductive material on both adjacent electrode plates, direct discharge and sparking can be avoided by setting the exposed conductive materials on the two adjacent electrode plates to be not directly opposite.

[0077] In practical applications, the effective working area can be regarded as an analog quantity with a non-0-1 relationship. Although air (such as unpurified gas) flows through the effective working area, it is turbulent after all and will diffuse into the shielding space outside the effective working area. The closer to the edge of the shielding space (that is, the farther away from the effective working area), the less air flows through it, and conversely, the closer to the effective working area, the more air flows through it. Therefore, by arranging the exposed conductive material outside the effective working area and close to the effective working area, the power supply can drive the conductive pollutants to a certain extent, but the driving effect is relatively weak compared to arranging the exposed conductive material within the effective working area. Therefore, by arranging the exposed conductive material outside the effective working area and close to the effective working area, the long-term operation efficiency of the electrostatic dust collector can also be improved to a certain extent. The exposed conductive material is close to the effective working area, which means that the distance between the exposed conductive material and the edge of the effective working area is less than or equal to 10 mm, that is, the exposed conductive material is located outside the effective working area and the distance between it and the effective working area is less than or equal to 10 mm. Exemplarily, if the exposed conductive material is located outside the effective working area, the distance between the exposed conductive material and the effective working area may be less than or equal to 5 mm. For example, the exposed conductive material may be disposed at a position 5 mm from the edge of the effective working area of ​​the electrode plate.

[0078] In some embodiments, the exposed conductive material can be the connecting portion between the electrode plate and the high-voltage power supply. That is, the connecting portion between the electrode plate and the high-voltage power supply can serve as the exposed conductive material. The connecting portion between the positive electrode plate and the high-voltage power supply, and the connecting portion between the negative electrode plate and the high-voltage power supply, are usually located at two ends of the electrode plate that are far away from each other. Therefore, using the connecting portion between the electrode plate and the high-voltage power supply as the exposed conductive material can meet the condition that the exposed conductive materials on adjacent electrode plates are not facing each other.

[0079] Figure 7 It is a schematic diagram showing the effective working area when a frame (ie, a second frame) is set outside the electrode.

[0080] See also Figure 7 When the electrode group is actually assembled into a filter, there will be some misalignment between the positive and negative electrodes, which makes it easier to power the electrodes. At the same time, for structural, performance and safety considerations, there will be additional frames outside the electrodes, which will block the power supply area of ​​the electrodes to a certain extent. Since the edges of the electrodes are not directly ventilated, the connection between the electrode plates and the high-voltage power supply is outside the effective working area. Therefore, the real effective working area of ​​the electrostatic precipitator is retracted to the hollow area of ​​the frame, that is, Figure 7 The area indicated by the wavy line in the middle. In addition, there is a certain degree of misalignment of the electrodes, which prevents the contaminants from completely diffusing to the conductive parts at the edge of the electrodes, thereby preventing the contaminants on the surface of the insulating material from connecting to the power supply.

[0081] In view of the situation that the connection part between the electrode plate and the high-voltage power supply is not within the effective working area due to being blocked, the present disclosure proposes two feasible methods to make the connection part serve as a bare conductive material.

[0082] One feasible way is to modify the external frame (ie, the second frame) so that the modified external frame (ie, the first frame) avoids the connection between the electrode plate and the high-voltage power supply, so that the connection is located within the effective working area.

[0083] Figure 8 Schematic diagram showing the effective working area based on the transformed external frame (ie, the first frame).

[0084] like Figure 8 As shown, the external frame can be modified with the goal of "avoiding the conductive parts (i.e., the connecting parts) where the electrodes are connected to the power source so that the connecting parts exposed to the air are located within the effective working area."

[0085] In other words, the electrostatic precipitator may further include a first frame. The first frame is configured to avoid the connection portion between the electrode plate and the high voltage power supply so that the connection portion is located within the effective working area.

[0086] In this way, the connection between the electrode plate and the high-voltage power supply can be located within the effective working area in a simple manner, while also satisfying the condition that the exposed conductive material of the adjacent electrode plates is not directly opposite. However, since the connection between the conductive part of the product and the power supply is poor in aesthetics and the purification efficiency of the area near the connection is very low, the overall purification efficiency of the filter will be sacrificed, so this method can be regarded as a feasible but not particularly ideal solution.

[0087] Another feasible way is to expand the connection portion between the electrode plate and the high voltage power supply so that the expanded connection portion can enter the effective working area.

[0088] That is, the electrostatic dust collector may further include a second frame. The second frame is configured to shield the first connection portion between the electrode plate and the high voltage power supply so that the first connection portion is located outside the effective working area. The second frame can be regarded as Figure 7 The outer frame shown. Without modifying the second frame, the size of the connection part between the electrode plate and the high-voltage power supply can be enlarged so that the connection part can enter the effective working area. Thus, the connection part between the electrode plate and the high-voltage power supply can include a first connection part and a second connection part, the second connection part is connected to the first connection part, and extends from the first connection part to the effective working area, and the exposed conductive material is the second connection part.

[0089] Fig. 9A is a schematic side cross-sectional view showing an electrode plate.

[0090] Fig. 9B is a schematic top view showing an electrode plate.

[0091] See also Fig. 9A , Fig. 9B , the exposed red part shown on the right side of the dotted line is the first connection part, and the exposed red part shown on the left side of the dotted line is the second connection part. The first connection part is located outside the effective working area, and the second connection part is located within the effective working area. By extending the connection part that was originally located entirely outside the effective working area, a part of the connection part (i.e., the second connection part) can be extended into the effective working area, so that the second connection part can serve as an exposed conductive material that can help the conductive contaminants on the electrode surface connect to the power supply.

[0092] In the case where the connection between the electrode plate (insulated electrode) and the high-voltage power supply is blocked and outside the effective working area, the surface insulation properties of the electrode plate can be destroyed so that the electrode plate has exposed conductive material in the effective working area. For the electrode plate, the positions where the surface insulation properties can be destroyed include the side, the opposite side, and the surface.

[0093] The surface (i.e., the electrode surface) may also be referred to as the front side. In the present disclosure, the surface and the front side may be used interchangeably. Each electrode plate includes two surfaces, two side surfaces, a connection surface, and an opposite side. The distance between the two surfaces of two adjacent electrode plates that are close to each other may be referred to as the plate spacing. The connection surface refers to the surface where the connection portion of the electrode plate and the high-voltage power supply is located, and the opposite side refers to the surface parallel to the connection surface. When the connection portion of the electrode plate (insulated electrode) and the high-voltage power supply is outside the effective working area due to being blocked, the connection surface is located outside the effective working area and is usually far away from the effective working area. The positive and negative electrode plates are generally arranged at a certain distance apart, so that even if the opposite side is outside the effective working area, it is not far away from the effective working area. Therefore, the position that destroys the surface insulation properties may also include the opposite side. The side used to destroy the insulation properties mentioned below refers to at least one of the two side surfaces. For example, the surface where the connection portion of the electrode plate and the high-voltage power supply is located (i.e., the connection surface) may be a surface composed of the width and thickness of the electrode plate, and the side used to destroy the insulation properties may refer to two side surfaces composed of the length and width of the electrode plate.

[0094] The problem of damaging the front side is more serious. Considering the cost and structural factors, the conductive materials usually used are very thin and are very easy to fall off under the action of high voltage. The material requirements for damaging the insulation properties of the front side are high, and the current process is difficult to achieve or the cost is very high. In addition, when destroying the insulation properties of the surfaces of two adjacent electrode plates, the non-alignment condition must also be met.

[0095] As mentioned above, not facing directly means that they are staggered by a certain distance in space. This distance refers to the distance in the direction parallel to the plates. The direction parallel to the plates is also the direction perpendicular to the plate spacing. The plate spacing refers to the distance between the plate surfaces (i.e., the front side) composed of the length and width of the electrode plates. The plate spacing is perpendicular to the plate surfaces composed of the length and width of the electrode plates. Therefore, the direction perpendicular to the plate spacing (i.e., the direction parallel to the plates) can be the plate length direction or the plate width direction. In principle, this distance cannot be too small, and at least must be greater than or equal to the minimum sheet spacing between the positive and negative electrodes to ensure initial normal operation. Therefore, for two adjacent electrode plates in the electrostatic precipitator that are both insulating electrodes, if the insulation properties of the front positions of the two adjacent electrode plates are destroyed, it is difficult to meet the staggered distance required for the non-facing condition, and it is technically difficult to achieve due to the high requirements for conductive materials.

[0096] In contrast, it is very easy to destroy the insulation properties from the side or opposite side, and the physical size of the electrode plate can be used for spatial isolation, that is, the length or width of the electrode plate can be used to make the exposed conductive materials of two adjacent electrode plates have sufficient offset distance, which can well meet the non-alignment condition. Therefore, the present disclosure prefers to destroy the insulation properties from the side or opposite side of the electrode plate.

[0097] Fig.10 Schematic diagram showing the structure of two adjacent electrode plates.

[0098] like Fig.10 As shown, exposed conductive material can be arranged on the same side of two adjacent electrode plates. The distance between the exposed conductive materials of the two adjacent electrode plates (i.e., the offset distance l) is the distance between the exposed conductive materials of the two adjacent electrode plates in the length direction of the electrode plates. The sheet spacing d is the distance between the surfaces (front sides) of the two adjacent electrode plates. Fig.10 In terms of the offset distance l, the length dimension of the electrode plate can be increased.

[0099] For at least two adjacent electrode plates in an electrostatic precipitator that are both insulating electrodes, at least one of the two adjacent electrode plates can be configured to lead out a section of exposed conductive material from at least one position on the opposite side or at least one side. The at least one side can be one side or two sides. The position where the exposed conductive material is led out can be a position within the effective working area, or a position outside the effective working area and close to the effective working area, that is, a position with a distance from the effective working area less than or equal to 10 mm.

[0100] Both adjacent electrode plates may be configured to lead out a section of exposed conductive material from at least one position of at least one side. Alternatively, only one of the electrode plates may be configured to lead out a section of exposed conductive material from at least one position of at least one side. In the case where only one of the electrode plates is configured to lead out a section of exposed conductive material from at least one position of at least one side, the other electrode plate may be configured to expose a section of exposed conductive material from the front side, or may be configured so that no exposed conductive material exists.

[0101] When two adjacent electrode plates are configured to lead out a section of exposed conductive material from at least one position of at least one side, at least one section of exposed conductive material can be respectively led out from different sides of the two adjacent electrode plates, or at least one section of exposed conductive material can be respectively led out from the same side of the two adjacent electrode plates. When at least one section of exposed conductive material is respectively led out from the same side of the two adjacent electrode plates, the distance between the exposed conductive materials of the two adjacent electrode plates in the length direction of the electrode plates is greater than or equal to the minimum electrode plate spacing to meet the non-alignment condition.

[0102] It is theoretically feasible to destroy the insulating properties of the electrode plate surface from the front. For two adjacent electrode plates, one of the electrode plates can be configured to expose the internal conductive material from at least one position on the front side (i.e., the electrode surface), and the other can be configured to lead out or expose a section of exposed conductive material from at least one position on the opposite side, side, or front side. In addition, the distance between the exposed conductive materials of the two adjacent electrode plates in the direction perpendicular to the electrode plate spacing (e.g., the electrode plate length direction, the electrode plate width direction) is greater than or equal to the minimum electrode plate spacing to meet the non-direction condition.

[0103] The following is an exemplary description of how to destroy the insulation property from the side in conjunction with a specific embodiment.

[0104] Fig.11A is a schematic side cross-sectional view showing another electrode plate.

[0105] Fig. 11B is a schematic top cross-sectional view showing another electrode plate.

[0106] See also Fig.11A , Fig. 11B , the conductive layer inside the electrode plate can be completely connected to the edge of the electrode. That is, all surfaces of the electrode plate except the surface can be designed as an exposed structure that is not wrapped by insulating materials. The advantage of this is that the processing of the electrode will be very convenient and many processes can be completed. However, since all surfaces of this electrode plate except the surface (i.e., the surroundings) are completely conductive, this electrode plate cannot be used in the entire electrostatic precipitator. At most, it can be used as all positive electrodes or all negative electrodes, and the electrodes adjacent to it cannot have any conductive materials exposed in the effective working area.

[0107] Therefore, for two adjacent electrode plates in an electrostatic precipitator that are both insulated electrodes, only one of them can be used Fig.11A , Fig. 11B The electrode plate is configured as shown, and the other electrode plate cannot have any conductive material exposed in the effective working area. Therefore, the power supply can only drive the conductive pollutants adsorbed on the surface of one of the electrode plates.

[0108] Fig.12 is a schematic top-view cross-sectional diagram showing two adjacent electrode plates.

[0109] See also Fig.12 , can be Fig.11A , Fig. 11BThe electrode plates of the configuration shown are improved so that only the conductive material on one side of the electrode plates is exposed, so that all electrode plates can be configured. During installation, two adjacent electrode plates can be rotated 180° to expose the conductive materials on different sides of the two adjacent electrode plates, thereby ensuring that the exposed conductive materials of the two adjacent electrode plates are not facing each other.

[0110] In practical applications, Fig.12 The electrode plate shown may still encounter engineering problems, such as the difficulty in pressing or bonding the conductive material. In this case, the scope of the exposed conductive material can be further reduced to solve the engineering problems encountered.

[0111] Fig.13A is another schematic top-view cross-sectional view of two adjacent electrode plates.

[0112] Fig. 13B It shows that based on Fig.13A Schematic diagram of the arrangement structure of the electrode plates configured as shown.

[0113] See also Fig.13A , a row of exposed conductive materials can be led out on different sides of two adjacent electrode plates (for example, the sides located in the effective working area). The number of exposed conductive materials led out can be set as needed, and the minimum number is 1. Fig.13A For example, the distance between the exposed conductive materials of two adjacent electrode plates is equal to the width of the electrode plates. Fig.13A The width of the electrode plates is utilized to ensure that there is a sufficient staggered distance between the exposed conductive materials of two adjacent electrode plates.

[0114] See also Fig. 13B , the exposed electrode part (i.e., exposed conductive material) can be placed on one side of the electrode piece (i.e., electrode plate), and the exposed electrode parts of adjacent electrode pieces can be arranged in a staggered manner. Based on this, a filter with a size of 300*250mm, a thickness of 40mm, and a sheet spacing of 1.5mm can be made. With this arrangement, the staggered distance of the exposed electrode can reach more than 20 times the sheet spacing.

[0115] It should be noted that Fig.13A as well as Fig.14 , Fig.15 It is only used to show how to arrange the exposed conductive material on two adjacent electrode plates. Fig.13A as well as Fig.14 , Fig.15 It is not used to represent the actual arrangement of two adjacent electrode plates. The actual arrangement structure of the electrode plates can be found in Fig. 13B as well as Figures 18 to 20 shown.

[0116] Fig.14is another schematic top-view cross-sectional view of two adjacent electrode plates.

[0117] See also Fig.14 , at least one section of exposed conductive material can be respectively derived from the same side of two adjacent electrode plates. For example, one or more sections of exposed conductive material can be derived from both sides of each of the two adjacent electrode plates. And the exposed conductive materials derived from the same side of two adjacent electrode plates can be staggered by a certain distance in the length direction of the electrode plates to meet the non-alignment condition. In other words, the distance between the exposed conductive materials derived from the same side of two adjacent electrode plates in the length direction of the electrode plates is greater than or equal to the minimum plate spacing. For the exposed conductive materials derived from different sides of two adjacent electrode plates, the width of the electrode plates can be used to naturally meet the non-alignment condition.

[0118] Fig.15 is another schematic top-view cross-sectional view of two adjacent electrode plates.

[0119] See also Fig.15 The minimum configuration may be to lead out a section of exposed conductive material from two ends of two adjacent electrode plates that are far away from each other. The exposed conductive material led out from the two adjacent electrode plates may be located on the same side or on different sides. Furthermore, the position of the exposed conductive material led out may be within the effective working area.

[0120] Combination of the above Figures 12 to 15 The various configurations shown are all achieved by leading the internal conductive material out from the side and exposing it to the air, while ensuring that the exposed conductive materials of two adjacent electrodes are not directly opposite each other, and the size of the electrode itself (i.e., the length or width of the electrode plate) can be used to maximize the spacing between the exposed conductive materials of two adjacent electrodes.

[0121] Fig.16A is a schematic side cross-sectional view showing another electrode plate.

[0122] Fig. 16B is a schematic top cross-sectional view showing another electrode plate.

[0123] See also Fig.16A , Fig. 16B A portion of the conductive material can also be led out from the connection portion between the electrode plate and the high-voltage power supply into the effective working area. The conductive material led out into the effective working area can be located on the side of the electrode plate located within the effective working area, or on the front of the electrode plate located within the effective working area.

[0124] Fig.17 is another schematic diagram showing the structure of two adjacent electrode plates.

[0125] Fig.17 The blue box in the figure can be Figure 7 The outer frame (i.e., the second frame) is shown. The blue area in Figure 16 can be regarded as a shielding area outside the effective working area. Referring to Figure 16, a section of exposed conductive material can be respectively derived from the two ends of two adjacent electrode plates that are far away from each other. The exposed conductive materials derived from the two adjacent electrode plates can be located on the same side or on different sides. Moreover, the position of the derived exposed conductive material can be located outside the effective working area and close to the effective working area, that is, the distance between the effective working area is less than or equal to 10 mm.

[0126] Fig.18 The figure shows a schematic diagram of the structure of an electrostatic dust removal device.

[0127] See also Fig.18 , the edge of the electrostatic precipitator is blocked. The green part in the middle is the effective working area. All electrode plates in the electrostatic precipitator can be insulated electrodes. The connection part between the electrode plate and the high-voltage power supply is located outside the effective working area. Any two adjacent electrode plates in the strong electric field electrostatic precipitator can be configured so that a group of exposed conductive materials are respectively derived from the two ends of the two electrode plates that are far away from each other. Each group of exposed conductive materials includes a section of exposed conductive material located on two sides of the electrode plate. The exposed conductive material is located within the effective working area. In this way, the distance between the exposed conductive materials of two adjacent electrode plates can reach 100 times the sheet spacing (i.e., the plate spacing).

[0128] Fig.18 The filter screen size of the electrostatic dust removal device shown is 300*250mm, 40mm thick, and 1.5mm between the sheets. Fig.18 The CADR and dust holding capacity data of the high electric field electrostatic precipitator are shown and compared with traditional high electric field products. The test results are as follows.

[0129]

[0130]

[0131] It can be seen that the initial purification efficiency of this scheme is very high, and the efficiency decreases slowly and tends to be stable in the long run. Compared with the traditional strong electric field scheme, the dust holding capacity is increased many times.

[0132] Fig.19 The figure shows a schematic diagram of the arrangement structure of electrode plates in an electrostatic precipitator.

[0133] See also Fig.19For at least two (such as any two) adjacent electrode plates in the electrostatic precipitator, only one of the electrode plates can be configured to have exposed conductive material, while the other electrode plate can be configured to have no exposed conductive material.

[0134] Based on this, a filter with a size of 300*250mm, a thickness of 40mm, and a sheet spacing of 1.5mm is manufactured. Considering that the positive and negative electrodes adsorb pollutants at different speeds, the positive electrode adsorbs more pollutants, while the negative electrode adsorbs less pollutants, the negative electrode plate can be configured to have no exposed conductive material, while the positive electrode plate can be configured to have exposed conductive material.

[0135] The test results of this filter are as follows.

[0136] Strong electric field solution This public scheme Initial CADR (m3 / h) 312 316 Loading 50 cigarettes CADR (m3 / h) 187 297 Loading 100 cigarettes CADR (m3 / h) 134 274 Loading 200 cigarettes CADR (m3 / h) -- 233 Loading 300 cigarettes CADR (m3 / h) -- 186

[0137] It can be seen that configuring only one of the adjacent electrode plates to have exposed conductive material can also increase the dust holding capacity of the filter, but the degree of increase is greatly reduced.

[0138] Fig. 20 It is a schematic diagram showing the structure of another electrostatic precipitator.

[0139] See also Fig. 20 This embodiment makes a special configuration, placing the exposed conductive material of the positive electrode plate in the electrostatic precipitator within the effective working area, and placing the exposed conductive material of the negative electrode plate in the electrostatic precipitator outside the effective working area but not too far away from the effective working area.

[0140] Usually, the distance between the part where the electrode is connected to the conductive rod and the effective working area is greater than 10mm. Because the so-called effective working area is a definition with actual physical existence and specific size. In actual work, although the air flows through the effective working area, due to the existence of turbulence, the unpurified air will partially diffuse into the shielded space. The closer to the edge, the less air flows, and vice versa, the closer to the ventilation position, the more air flows. Therefore, exposing the conductive material in places close to the effective working area, especially at a distance of less than 10mm, will also improve the performance to a certain extent, but the improvement is limited.

[0141] This embodiment attempts to place the exposed conductive material of the positive electrode plate at one end of the plate and within the effective working area of ​​the electrostatic precipitator, and to place the exposed electrode of the negative electrode plate at one end of the plate and outside the effective working area of ​​the electrostatic precipitator, and at a distance of 5 mm from the effective working area. Based on this, a filter screen with a size of 300*250mm, a thickness of 40mm, and a sheet spacing of 1.5mm was made and tested, and the results are as follows.

[0142] Strong electric field solution This public scheme Initial CADR (m3 / h) 312 313 Loading 50 cigarettes CADR (m3 / h) 187 307 Loading 100 cigarettes CADR (m3 / h) 134 264 Loading 200 cigarettes CADR (m3 / h) -- 208 Loading 300 cigarettes CADR (m3 / h) -- 205

[0143] It can be seen that this configuration has also improved the long-term operating efficiency of the electrostatic precipitator to a certain extent, but it is not as effective as exposing the conductive material directly to the effective working area. However, this configuration also has practical commercial value. Because the conductive material is exposed to the effective working area, human hands can directly touch the conductive material, which will have an adverse effect on applications in some fields. If the positive electrode is grounded, the negative electrode is connected to the negative high voltage of the power supply, and the conductive material of the negative electrode is hidden in the interval ≤10mm inside the frame, the exposed part of the conductive material can be free of high voltage electricity, and human hands can directly touch the filter device, thereby improving safety performance.

[0144] The conductive material of the electrode plate in the disclosed solution is wrapped by insulating material, so it has all the advantages of a strong electric field electrostatic precipitator, that is, it can make the air carry a voltage higher than the withstand voltage limit, thereby bringing initial high purification performance and small size. At the same time, due to the increase in the exposed characteristics of the conductive material in the effective working area, and the exposed conductive materials of adjacent electrode plates are not directly opposite, the driving ability of the pollutants on the electrode surface is improved, so that the performance of the electrostatic precipitator can be maintained to a large extent after the electrode surface is contaminated, which greatly improves the dust holding capacity of the product.

[0145] The flow chart and block diagram in the accompanying drawings show the possible architecture, function and operation of the system and method according to multiple embodiments of the present invention. In this regard, each square box in the flow chart or block diagram can represent a part of a module, program segment or code, and the part of the module, program segment or code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two continuous square boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs the specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0146] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terms used herein are selected to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An electrostatic dust collector, characterized in that: include: A plurality of positive electrode plates and a plurality of negative electrode plates, wherein the plurality of positive electrode plates and the plurality of negative electrode plates are arranged alternately and spaced apart, the positive electrode plates are connected to the positive electrode of a high-voltage power supply, and the negative electrode plates are connected to the negative electrode of the high-voltage power supply; There are at least two adjacent electrode plates, both of which are made of insulating material wrapped with conductive material. At least one of the two adjacent electrode plates has exposed conductive material, and the exposed conductive material is located within the effective working area, or the exposed conductive material is located outside the effective working area and the distance between the exposed conductive material and the effective working area is less than or equal to 10 mm, and if the exposed conductive material exists on both of the two adjacent electrode plates, then the distance between the exposed conductive materials on the two adjacent electrode plates in the direction perpendicular to the electrode plate spacing is greater than or equal to the minimum electrode plate spacing, and the effective working area refers to the area between the two adjacent electrode plates and through which unpurified gas can flow.

2. The electrostatic dust collector according to claim 1, characterized in that: If the exposed conductive material is located outside the effective working area, the distance between the exposed conductive material and the effective working area is less than or equal to 5 mm.

3. The electrostatic dust collector according to claim 1, characterized in that: The exposed conductive material is located in the effective working area.

4. The electrostatic dust collector according to any one of claims 1 to 3, characterized in that: The exposed conductive material is the connecting portion between the electrode plate and the high voltage power supply.

5. The electrostatic dust collector according to claim 4, characterized in that: Also includes: A first frame is configured to avoid a connection portion between the electrode plate and the high voltage power supply so that the connection portion is located within the effective working area.

6. The electrostatic dust collector according to claim 4, characterized in that: Also includes: a second frame, the second frame being configured to shield a first connection portion between the electrode plate and the high voltage power supply so that the first connection portion is located outside the effective working area, The connection part between the electrode plate and the high voltage power supply includes the first connection part and the second connection part, the second connection part is connected with the first connection part and extends from the first connection part to the effective working area, The exposed conductive material is the second connecting portion.

7. The electrostatic dust collector according to any one of claims 1 to 3, characterized in that: At least one of the two adjacent electrode plates is configured to lead out a section of the exposed conductive material from at least one position on the opposite side or at least one side, and the electrode plate includes two surfaces, two side surfaces, a connecting surface and an opposite side. The distance between the two mutually adjacent surfaces of the two adjacent electrode plates is the electrode plate spacing, the connecting surface refers to the surface where the connecting part of the electrode plate and the high-voltage power supply is located, and the opposite side refers to a surface parallel to the connecting surface, and the connecting surface is located outside the effective working area.

8. The electrostatic dust collector according to claim 7, characterized in that: The two adjacent electrode plates are configured to respectively lead out at least one section of the exposed conductive material from different sides of the two adjacent electrode plates.

9. The electrostatic dust collector according to claim 7, characterized in that: The two adjacent electrode plates are configured such that at least one section of the exposed conductive material is respectively derived from the same side of the two adjacent electrode plates, and the distance between the exposed conductive materials derived from the same side of the two adjacent electrode plates in the length direction of the electrode plates is greater than or equal to the minimum electrode plate spacing.

10. The electrostatic dust collector according to any one of claims 1 to 3, characterized in that: The two adjacent electrode plates are configured such that the internal conductive material is exposed at at least one position on the electrode surface of one of the electrode plates, at least one section of exposed conductive material is led out on the opposite side or side of the other electrode plate, or the internal conductive material is exposed at at least one position on the electrode surface of the other electrode plate, and the distance between the exposed conductive materials of the two adjacent electrode plates in the direction perpendicular to the electrode plate spacing is greater than or equal to the minimum electrode plate spacing. The electrode plates include two surfaces, two side surfaces, a connecting surface and an opposite surface. The distance between the two mutually adjacent surfaces of the two adjacent electrode plates is the electrode plate spacing. The connecting surface refers to the surface where the connecting part of the electrode plate and the high-voltage power supply is located, and the opposite surface refers to a surface parallel to the connecting surface. The connecting surface is located outside the effective working area.

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