Electrostatic dust collection filtering system

Abstract

The utility model relates to an electrostatic dust collection filtering system. The front three-dimensional porous filter screen is provided with at least three rows of staggered open meshes in the thickness direction, and the diameter of the open meshes is smaller than or equal to the length of the fluff pollutants and larger than the particle size of the suspended particles. The electrostatic dust collection filter screen 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. Gas to be dedusted passes through the electrostatic dust collection filter screen through the three-dimensional porous filter screen, so that pollutants are removed. Therefore, fluff pollutants can be effectively filtered in a low-resistance mode, and the risk of short circuit of the positive electrode and the negative electrode of the electrostatic dust collection filter screen caused by the fluff pollutants is eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of electrostatic dust removal, in particular to an electrostatic dust collecting and filtering system. Background Art

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

[0003] The electrostatic dust collection filter has a strong electrostatic field formed by alternating positive and negative electrode components to collect dust.

[0004] Electrostatic dust filters can absorb very fine particles, but they have almost no ability to absorb large pollutants, such as dandelions, catkins, fine hairs, and mosquitoes that may appear in the air duct. At the same time, when the distance between the positive and negative electrodes is relatively small, if these pollutants overlap between the positive and negative electrodes, the filter performance will be reduced at best, and discharge and sparking will occur at worst, which may also cause safety accidents.

[0005] Therefore, when using an electrostatic dust filter, a coarse-effect filter is usually required in front of it.

[0006] The definition of an air filter is a device that removes particulate matter from the air. According to GB14295-2019, the lowest grade coarse-effect filter and C1 grade coarse-effect filter have the requirement of gravimetric efficiency E, 50%>E≥20% for pollutant removal. The test dust source is D1 experimental dust, which is composed of 72% loess, 23% carbon black and 5% short cotton lint.

[0007] As can be seen from the above, the traditional coarse-effect filter has a certain filtering effect on fine particles. Therefore, this type of filter is usually made of fine fiber materials such as nylon, glass fiber, and non-woven fabrics, and intercepts fine particles through extremely high weaving density. The initial resistance requirement of this type of filter is ≤50Pa. For filters of the filter medium type, this resistance is relatively low, but for electrostatic dust collection and filtration systems, this resistance is high. Moreover, the resistance of filters made of fine fiber materials rises very quickly when working, which further increases the resistance and requires frequent maintenance and updating.

[0008] The electrostatic precipitator filter belongs to the adsorption type filter, which is different from the most common filter type, the media filter, on the market. Because the dust holding capacity of the media filter is relatively low, and once dust is intercepted, its resistance will increase. This makes it necessary for each stage of the media filter system to have a certain dust collection ability for particulate matter, so as to protect the subsequent filter by the previous filter. The characteristic of the electrostatic precipitator filter is low resistance and large dust holding capacity. Therefore, it can work stably for a long time without very strict protection from the previous filter.

[0009] Therefore, when using the electrostatic precipitator filter, it often does not use the coarse filter that meets the national standard, but instead uses a coarse filter screen such as a gauze or a metal wire mesh with low resistance and easy to clean. This kind of coarse filter screen can effectively intercept insects, mice, mosquitoes and flies, and partially filter large suspended matters such as catkins and dandelions, but it has almost no purification ability for fine fluff and other fine particulate matters.

[0010] For the electrostatic precipitator filter, it is necessary to avoid direct short circuit between the electrodes. If pollutants directly connect the positive and negative electrodes, a short circuit current will be formed, affecting the purification ability of the purifier. When this short circuit current reaches a certain level, the performance of the filter will decline or even fail. When the electrode spacing is relatively high, such as >3mm, the influence of fine fluff in the air on the short circuit between the electrodes is relatively small. When the electrode spacing is low, such as ≤2mm, the fine fluff type pollutants passing through the filter are likely to form a connection between the positive and negative electrodes, thus affecting the filter performance.

[0011] Therefore, the traditional coarse filter that meets the national standard has a large resistance and requires frequent maintenance. And ordinary gauze or metal mesh cannot effectively intercept fine fluff type pollutants. This results in either a large resistance in the whole filtration system, requiring frequent maintenance of the coarse filter, or frequent maintenance of the electrostatic precipitator filter, increasing the operating cost of the system.

[0012] Therefore, a more effective coarse filtration structure needs to be configured for the electrostatic precipitator filter. Utility Model Content

[0013] One technical problem to be solved by this utility model is how to configure a more effective coarse filtration structure for the electrostatic precipitator filter.

[0014] The present utility model provides an electrostatic dust collection and filtration system, comprising: a three-dimensional porous filter screen at the front, the three-dimensional porous filter screen having at least three rows of mutually staggered open pores in the thickness direction, the diameter of the open pores being less than or equal to the length of fluff-like pollutants and greater than the particle size of suspended particulate matter; an electrostatic dust collection filter screen, the electrostatic dust collection filter screen 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 alternately arranged 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, wherein the gas to be dust-removed passes through the electrostatic dust collection filter screen via the three-dimensional porous filter screen to complete the removal of pollutants.

[0015] Optionally, the distance between two adjacent electrode plates is less than or equal to a first threshold value.

[0016] Optionally, the first threshold value is between 2 mm and 3 mm.

[0017] Optionally, the first threshold value is 2 mm.

[0018] Optionally, there is partial overlap between two adjacent rows of open pores.

[0019] Optionally, the thickness of the three-dimensional porous filter screen is greater than or equal to a second threshold value.

[0020] Optionally, the second threshold value is twice the diameter of the open pores.

[0021] Optionally, the three-dimensional porous filter screen is at least one of the following: foam ceramics, foam silicon carbide, polyurethane foam, and foam nickel.

[0022] Optionally, the diameter of the open pores is between 0.1 mm and 2 mm.

[0023] Optionally, the diameter of the open pores is between 0.4 mm and 1 mm.

[0024] Thus, by using a three-dimensional porous filter screen with at least three rows of mutually staggered open pores in the thickness direction as a primary filter in front of the electrostatic dust collection filter screen, the present utility model can effectively filter fluff-like pollutants in a low-resistance manner, eliminating the risk of short circuit between the positive and negative electrodes of the electrostatic dust collection filter screen caused by fluff-like pollutants. Description of the Drawings

[0025] By describing the exemplary embodiments of the present utility model in more detail in conjunction with the drawings, the above and other objects, features, and advantages of the present utility model will become more apparent. Among them, in the exemplary embodiments of the present utility model, the same reference numerals generally represent the same components.

[0026] Figure 1 It is a schematic structural diagram showing a ceramic foam.

[0027] Figure 2 It is a schematic structural diagram showing a polyurethane foam.

[0028] Figure 3 It is a schematic structural diagram showing an electrostatic precipitating and filtering system according to an embodiment of the present invention.

[0029] Figure 4 It is a schematic structural diagram showing an electrostatic precipitating and purifying device using a standard primary filter.

[0030] Figure 5 It is a schematic structural diagram showing an electrostatic precipitating and purifying device using a primary filter with a planar structure.

[0031] Figure 6A It is a schematic diagram showing the recorded number of fine villi between electrodes.

[0032] Figure 6B It is a schematic diagram showing the recorded resistance data.

[0033] Figure 7A It is a schematic diagram showing the specific configurations and test data of four electrostatic precipitating and filtering devices.

[0034] Figure 7B It is shown based on Figure 7A The schematic diagram of the conclusion obtained from the shown test data. Detailed implementation manners

[0035] The preferred embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0036] In the present invention, the terms "electrostatic precipitating filter screen" and "electrostatic precipitating filter" can be used interchangeably.

[0037] In other words, the "electrostatic precipitating filter screen" can also be referred to as the "electrostatic precipitating filter".

[0038] The numerical ranges described in the present invention may include the endpoint values on both the left and right sides, or may not include the endpoint values on both the left and right sides.

[0039] The fluff mentioned in the present utility model refers to relatively fine fluff, such as short fluff, fine hair, etc. Therefore, fluff can also be called "fine fluff". Correspondingly, fluff-type pollutants can also be called "fine fluff-type pollutants".

[0040] The electrostatic precipitator filter has a very high dust-holding capacity for fine particles, but a very low dust-holding capacity for fluff-type pollutants because the fluff will directly short-circuit the positive and negative electrodes of the electrostatic precipitator filter, which must be avoided.

[0041] Therefore, when the electrostatic precipitator filter is in use, a primary filter is usually also required to be configured in front of it.

[0042] The scenarios where the electrostatic precipitator filter is applied are all low-resistance and high-dust-holding scenarios. The characteristics of a primary filter that meets the national standard are high resistance and low dust-holding capacity. Therefore, there is a performance mismatch in this combination and the actual application effect is not ideal.

[0043] When using an ordinary gauze or metal mesh as the primary filter, due to the low ability to inhibit short cotton fluff, a lot of fine fluff-type pollutants will be collected between the electrodes. This is also the reason why the electrode spacing of the mainstream electrostatic precipitator filter is usually set to be relatively large (at least larger than the length of the fine fluff-type pollutants).

[0044] In view of this, the present utility model proposes that a three-dimensional porous filter screen can be introduced as the primary filter in front of the electrostatic precipitator filter screen, so as to effectively filter fluff-type pollutants in a low-resistance manner and eliminate the risk of short-circuiting of the positive and negative electrodes of the electrostatic precipitator filter screen caused by fluff-type pollutants.

[0045] At the same time, since the pre-set three-dimensional porous filter screen can effectively filter fluff-type pollutants, the present utility model supports setting the electrode spacing of the electrostatic precipitator filter screen to a smaller value. According to the dust removal efficiency equation (i.e., the Deutsch formula), the performance of the electrostatic precipitator filter screen is proportional to its filtration area. By reducing the electrode spacing, more sets of electrode pairs can be arranged in the same volume, thereby increasing the filtration area and improving the purification efficiency.

[0046] Based on the above concept, the present utility model proposes an electrostatic precipitator filtering system.

[0047] The electrostatic precipitator filtering system includes a pre-set three-dimensional porous filter screen and an electrostatic precipitator filter screen.

[0048] The three-dimensional porous filter is a three-dimensional structure. The three-dimensional porous filter has at least three rows of open mesh holes that are staggered with each other in the thickness direction. Open mesh holes (hereinafter referred to as "mesh holes") refer to mesh holes that are connected. By arranging the mesh holes in a staggered arrangement, the mesh holes are not straight through when viewed from the windward side, but a tortuous passage path. In this way, the passage of fluff-like pollutants can be truly and effectively prevented. However, since two rows of mesh holes are basically equivalent to straight through in the direction of airflow movement, the passage of fluff-like pollutants cannot be truly and effectively prevented, so the utility model configures the three-dimensional porous filter to have at least three rows of mesh holes in the thickness direction.

[0049] The diameter of the mesh can be less than or equal to the length of the fluff-like pollutants and larger than the particle size of the suspended particulate matter. In this way, the three-dimensional porous filter has the ability to filter out fluff-like pollutants, but will not filter out suspended particulate matter. Among them, since the mesh is not straight from the windward side, the diameter of the mesh can theoretically be slightly larger than the length of the fluff-like pollutants. Slightly larger means that the difference between the diameter of the mesh and the length of the fluff-like pollutants can be a smaller threshold, and the specific value can be flexibly set according to the actual situation. For example, when the three-dimensional porous filter is composed of multiple rows of interlaced open meshes and the tortuous path formed is more complex (that is, more tortuous), it is allowed to set the diameter of the mesh to be relatively larger.

[0050] Taking the fluff-type pollutants to be filtered as short lint-type pollutants as an example, the length of the short lint is usually between 2mm and 3mm, so preferably, the diameter range of the mesh can be set to no more than 2mm. If the diameter of the mesh is too small, it will block the passage of dust. It is generally believed that the maximum particle size of suspended particles is 100nm, that is, 0.1mm. Therefore, the diameter of the mesh should also be greater than 0.1mm to ensure that the fine particles in the gas to be removed (such as air) can pass through the three-dimensional porous filter smoothly. Therefore, the mesh diameter range of the three-dimensional porous filter can be controlled between 0.1mm and 2mm. More preferably, in order to more effectively inhibit the passage of short lint and ensure the low wind resistance characteristics of the filter, the mesh diameter range of the three-dimensional porous filter can be controlled between 0.4mm and 1mm.

[0051] Two adjacent rows of mesh holes of the three-dimensional porous filter may be partially overlapped, so that the three-dimensional porous filter has better low resistance and large dust holding properties.

[0052] In principle, the thicker the three-dimensional porous filter, the higher the filtration efficiency, but the resistance will also increase. Therefore, in practical applications, the three-dimensional porous filter should be as thin as possible while ensuring the filtration efficiency. Exemplarily, the thickness of the three-dimensional porous filter can be set to be greater than or equal to the second threshold. The second threshold can be twice the mesh diameter.

[0053] There are many materials with a three-dimensional porous filter mesh structure that meet the present utility model, including but not limited to ceramic foam, nickel foam, aluminum foam, silicon carbide foam, open-cell polyurethane foam, etc. Therefore, by way of example, the three-dimensional porous filter mesh can be at least one of the following: ceramic foam, silicon carbide foam, polyurethane foam, nickel foam.

[0054] Figure 1 FIG. shows a schematic structural diagram of ceramic foam.

[0055] Figure 2 FIG. shows a schematic structural diagram of polyurethane foam.

[0056] According to Figure 1 , Figure 2 it can be seen that the three-dimensional porous filter mesh adopts a multi-row staggered mesh structure, which can increase the path complexity, thereby effectively filtering short fluff-like pollutants. Moreover, the low-resistance and large dust-holding characteristics of the three-dimensional porous filter mesh make it very suitable to be combined with an electrostatic precipitator filter to form a set of low-resistance and high-dust-holding purification system. After configuring the three-dimensional porous filter mesh as a pre-filter, the electrostatic precipitator filter mesh can achieve a higher-performance filtering effect by reducing the electrode spacing.

[0057] Figure 3 FIG. shows a schematic structural diagram of an electrostatic precipitator filter system according to an embodiment of the present utility model. Among them, for the electrostatic precipitator filter mesh, Figure 3 only the electrode plate structure in the electrostatic precipitator filter mesh is shown. It should be understood that the electrostatic precipitator filter mesh may also include other components not shown in the figure.

[0058] Referring to Figure 3 , the electrostatic precipitator filter mesh includes 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 are alternately arranged at intervals. The positive electrode plates are connected to the positive pole of the high-voltage power supply, and the negative electrode plates are connected to the negative pole of the high-voltage power supply. The three-dimensional porous filter mesh serves as a pre-filter. The gas to be dust-removed (such as air) passes through the electrostatic precipitator filter mesh via the three-dimensional porous filter mesh to complete the removal of pollutants in the gas.

[0059] Under the effective filtering action of the pre-set electrostatic precipitator filter mesh on fluff-like pollutants, the risk of short circuit between the positive and negative electrodes of the electrostatic precipitator filter mesh caused by fluff-like pollutants can be eliminated. Therefore, the electrode spacing of the electrostatic precipitator filter mesh can be set to a smaller value. The electrode spacing, that is, the distance between two adjacent electrode plates. That is, the distance between two adjacent electrode plates can be less than or equal to the first threshold. By way of example, the first threshold can be between 2 mm and 3 mm. That is, the electrode spacing of the electrostatic precipitator filter mesh can be controlled between 2 mm and 3 mm. For example, the first threshold can be 2 mm.

[0060] The present utility model also designed an experiment to compare the filtering effects of coarse filters with different configurations on short cotton lint.

[0061] Figure 4 Fig. shows the structural schematic diagram of an electrostatic precipitator purification device using a standard coarse filter.

[0062] Figure 5 Fig. shows the structural schematic diagram of an electrostatic precipitator purification device using a coarse filter with a planar structure.

[0063] The standard coarse filter refers to a coarse filter that complies with national standards (such as those specified in GB14295-2019).

[0064] The coarse filter with a planar structure refers to coarse filter meshes such as wire meshes and metal wire meshes.

[0065] The present utility model Figures 3 to 5 deployed these three electrostatic precipitator purification devices with different pre-filter structures to the same outdoor location for a comparative experiment.

[0066] These three electrostatic precipitator purification devices only differ in their pre-filter structures, and their electrostatic precipitation parts have the same configuration.

[0067] The configuration of the electrostatic precipitation part is as follows: the size is 400*400mm; the electrode configuration is a 1.5mm electrode spacing; the passing wind speed of the system is approximately 2.5m / s; the filter is equipped with a charging device, and the overall PM2.5 purification efficiency > 90%.

[0068] The pre-filter structure configurations of these three electrostatic precipitator purification devices are as follows: the three-dimensional porous filter screen uses 30 meshes, that is, the 3D mesh aperture is approximately 0.8mm, and the filter cotton is a polyurethane filter screen with a thickness of 4mm; the standard coarse filter is a C1-level filter that complies with GB14295-2019; the coarse filter with a planar structure is a 60-mesh wire mesh, that is, a wire mesh with an aperture of approximately 0.4mm.

[0069] These three electrostatic precipitator purification devices were continuously operated outdoors for 1 week (i.e., 168 hours), and then the number of fine fluff between the electrodes was observed. What was recorded was the average value of the number of fine fluff between a set of two positive and negative electrodes. Synchronously, the resistance data of the above three coarse filters in a 2.5m / s environment were tested and recorded in a standard test environment.

[0070] Figure 6A Fig. shows the schematic diagram of the recorded number of fine fluff between the electrodes.

[0071] Figure 6B Fig. shows the schematic diagram of the recorded resistance data.

[0072] Combined with Figure 6A 、 Figure 6BIt can be seen that both the standard coarse efficiency filter and the three-dimensional porous filter screen have very excellent suppression capabilities for short cotton lint, and the purification efficiency is greater than 99%. However, the flat-structured coarse efficiency filter cannot effectively suppress short cotton lint, resulting in a short circuit formed by a lot of short cotton lint between the positive and negative electrodes. From the perspective of resistance, the resistance of the standard coarse efficiency filter is very high, while the resistances of the flat-structured coarse efficiency filter and the three-dimensional porous filter screen are very low.

[0073] According to the dust removal efficiency equation (Deutsch formula), the performance of the electrostatic precipitator filter is directly proportional to its filtration area. Therefore, if the electrode spacing can be reduced, the purification efficiency of the filter can be increased to a great extent.

[0074] Traditionally, the mainstream electrode spacing of electrostatic precipitator filters is 4 cm - 5 cm. If the electrode spacing is reduced, a standard coarse efficiency filtering device that meets the requirements of national standard C1 level or above needs to be installed in the front (such as Figure 4 shown). However, the scenarios where electrostatic precipitator filters are applied are all low-resistance and high-dust-holding scenarios, and the characteristics of the coarse efficiency filters that meet the national standard are high resistance and low dust-holding capacity. Therefore, there is a performance mismatch in this combination, and the actual application effect is not ideal.

[0075] As Figure 5 shown, when using a screen or metal mesh with a flat filtration structure as the coarse efficiency filter, due to the low suppression ability of the flat-structured coarse efficiency filter for short cotton lint, a lot of fine fluff will be collected between the electrodes. The main length of these fine fluff is concentrated in 2 mm - 3 mm. This is also the reason why the electrode spacing of conventional electrostatic precipitator filters is relatively large.

[0076] As Figure 3 shown, due to the low-resistance and high-dust-holding characteristics of the three-dimensional porous filter screen, it is very suitable to be combined with an electrostatic precipitator filter to form a low-resistance and high-dust-holding purification system. After configuring the three-dimensional porous filter screen as the pre-filter, since there is no need to consider the influence of short cotton lint short-circuiting the electrodes, the electrode spacing can be designed to be smaller, enabling the electrostatic precipitator filter to achieve a higher-performance filtration effect by reducing the electrode spacing.

[0077] Combined with Figures 3 to 5 the three pre-filter structures shown, the present utility model designs four configurations of electrostatic precipitator filter devices, and conducts performance comparison tests on these four configurations of electrostatic precipitator filter devices in the air duct.

[0078] Figure 7A It is a schematic diagram showing the specific configurations and test data of the four electrostatic precipitator filter devices.

[0079] The pre - coarse filter structure adopted in Configuration 1 is a standard coarse filter. The pre - coarse filter structures adopted in Configuration 2 and Configuration 3 are both flat - structure coarse filters. The pre - coarse filter structure adopted in Configuration 4 is a three - dimensional porous filter screen.

[0080] The effective ventilation size, passing air velocity, and charging device adopted in Configurations 1 to 4 are the same.

[0081] The electrode spacing of the electrostatic dust - collecting filter screen in Configurations 1, 3, and 4 is 1.5 mm, and the electrode spacing of the electrostatic dust - collecting filter screen in Configuration 2 is 3 mm.

[0082] See Figure 7A , first record the initial test data of these four configurations, and then record the test data after 1 - month actual operation outdoors. Figure 7B is a schematic diagram showing the conclusion drawn based on Figure 7A the test data shown.

[0083] Regarding the test results of the above - mentioned four configurations, the following can be summarized.

[0084] ① The standard coarse filter can effectively intercept short cotton fluffs, so it can support the configuration of a high - density electrostatic dust - collecting net. Both the initial efficiency and the efficiency after operation are very high. Its problem is that the initial resistance is high and the final resistance is even higher, which will cause a significant increase in power consumption for a high - static - pressure ventilation system and will directly lead to a large drop in air volume for a low - static - pressure ventilation system.

[0085] ② The flat - structure coarse filter cannot effectively intercept short cotton fluffs, so in principle, it does not support the configuration of a high - density electrostatic dust - collecting net. After reducing the electrode density of the electrostatic dust - collecting net, the initial efficiency drops significantly. At the same time, due to some short - circuit situations of short cotton fluffs between the electrodes, the efficiency after one - month operation also decreases.

[0086] ③ The flat - structure coarse filter cannot effectively intercept short cotton fluffs. When forcibly configuring a high - density electrostatic dust - collecting net, a good purification efficiency is initially obtained. But after one month of operation, the purification efficiency drops significantly.

[0087] ④ The three - dimensional porous filter screen can effectively intercept short cotton fluffs, so it can support the configuration of a high - density electrostatic dust - collecting net. Both the initial efficiency and the efficiency after operation of the equipment are very high, and both the initial resistance and the resistance after operation are very low. It is an air purification system with excellent performance that can be significantly distinguished from other solutions.

[0088] In summary, the electrostatic dust collection and filtration system proposed by the present utility model has at least the following advantages: when the three-dimensional porous filter screen is used as a pre-filter and combined with the electrostatic dust collection filter with a low electrode spacing, it can achieve the characteristics of high initial purification efficiency, low resistance, slow attenuation of purification efficiency during long-term operation, and slow rise of resistance; reducing the air resistance of the system can first help the ventilation system save energy, and at the same time enable the system to be used in some low-static-pressure ventilation systems. Increasing the dust capacity can reduce the use and maintenance costs of the system. Therefore, the system has comprehensive advantages such as high performance, energy saving, and low cost.

[0089] The electrostatic dust collection and filtration system according to the present utility model has been described in detail above with reference to the accompanying drawings.

[0090] The embodiments of the present utility model have been described above. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, the practical application, or the improvement of the technology in the market, or to enable other ordinary technical personnel in the technical field to understand the embodiments disclosed herein.

Claims

1. An electrostatic dust collection and filtration system, characterized in that: include: A three-dimensional porous filter screen is placed in front, wherein the three-dimensional porous filter screen has at least three rows of interlaced open meshes in the thickness direction, and the diameter of the open meshes is less than or equal to the length of the fluffy pollutants and greater than the particle size of the suspended particles; The electrostatic dust collection filter comprises 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. The gas to be dusted passes through the three-dimensional porous filter and the electrostatic dust collection filter to complete the removal of pollutants.

2. The electrostatic dust collection and filtration system according to claim 1, characterized in that: The distance between two adjacent electrode plates is less than or equal to a first threshold.

3. The electrostatic dust collection and filtration system according to claim 2, characterized in that: The first threshold is between 2 mm and 3 mm.

4. The electrostatic dust collection and filtration system according to claim 2 or 3, characterized in that: The first threshold is 2 mm.

5. The electrostatic dust collection and filtration system according to claim 1, characterized in that: There is a partial overlap between two adjacent rows of open meshes.

6. The electrostatic dust collection and filtration system according to claim 1, characterized in that: The thickness of the three-dimensional porous filter is greater than or equal to a second threshold.

7. The electrostatic dust collection and filtration system according to claim 6, characterized in that: The second threshold is twice the diameter of the open mesh.

8. The electrostatic dust collection and filtration system according to claim 1, characterized in that: The three-dimensional porous filter screen is at least one of the following: foam ceramic, foam silicon carbide, polyurethane foam, and foam nickel.

9. The electrostatic dust collection and filtration system according to claim 1, characterized in that: The diameter of the open mesh is between 0.1 mm and 2 mm.

10. The electrostatic dust collection and filtration system according to claim 1 or 9, characterized in that: The diameter of the open mesh is between 0.4 mm and 1 mm.

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