Gas particulate matter purification device and internal combustion engine tail gas emission treatment device

Abstract

The utility model discloses a gas particulate matter purification device and an internal combustion engine tail gas emission treatment device, which are used for adsorbing and purifying particulate matters in gas. The gas particulate matter purification device comprises a discharge unit and a purification unit, wherein the discharge unit comprises at least one discharge beam electrically connected with one electrode of a direct-current high-voltage power supply; the first metal net adsorption unit comprises multiple layers of metal nets which are stacked together, and the multiple layers of metal nets are electrically connected with the other electrode of the direct-current high-voltage power supply; along the gas flow direction, the first metal net adsorption unit is located in front of the discharge unit, and a distance is formed between the first metal net adsorption unit and the discharge unit, or the first metal net adsorption unit is located behind the discharge unit, and a distance is formed between the first metal net adsorption unit and the discharge unit; the discharge beam is arranged on one surface, facing the first metal net adsorption unit, of the discharge unit; and a discharge beam of the discharge unit and the multiple layers of metal nets of the first metal net adsorption unit form an electric field.

Description

Technical Field

[0001] The utility model relates to a gas particle purification device and an internal combustion engine tail gas emission treatment device. Background Art

[0002] As people's environmental awareness is increasing, the recognition and purification demand for pollutants in air gases (including but not limited to smoke, dust, VOCs and engine exhaust) are also increasing. Therefore, more and better purification technologies are gradually being installed and used in vehicles, factories, and home environments. Among these purification technologies, electrostatic dust removal and adsorption technology has a very common application. The principle of electrostatic dust removal and adsorption technology is that the gas is ionized when passing through the electrostatic field. After the particles in the gas combine with the charged ions, they tend to move to the electrode with the opposite polarity to the charged ions and deposit. It can be seen that the particle removal rate is related to the charging efficiency of the particles. The core electrostatic field is mostly composed of an adsorption plate and a cathode wire (discharge electrode) arranged in the adsorption plate. Therefore, the technology of the adsorption plate and the discharge electrode has become the key to improving the particle removal rate.

[0003] The existing technology still has the problem that the assembly accuracy of the discharge electrode and the adsorption electrode is difficult to control, which not only has a high production cost, but also has technical problems such as sparking due to the low assembly accuracy of the discharge electrode and the adsorption electrode, as well as poor particle removal rate and purification effect.

[0004] The exhaust gas of internal combustion engines contains a large amount of particulate matter and pollutants such as nitrogen oxides. The existing technology uses a particulate matter filter (DPF device) to filter particulate matter. The DPF can filter out large particles, but the back pressure of the DPF is large, which leads to a significant increase in engine fuel consumption and energy consumption, and the cost of use is significantly increased.

[0005] Therefore, it is urgent to find new methods for removing particulate matter, on the one hand to overcome the problems existing in electrostatic dust removal adsorption technology, and on the other hand to overcome the problem of high back pressure of DPF. Summary of the invention

[0006] The utility model provides a gas particulate matter purification device to achieve at least one of the following purposes: remove large particle pollutants and / or particulate matter (including but not limited to smoke, dust, VOCs and engine exhaust) in the gas; and also provide an internal combustion engine exhaust emission treatment device with increased life and low cost to improve exhaust gas purification efficiency, reduce back pressure, reduce fuel consumption and reduce costs.

[0007] In order to achieve the above purpose and other related purposes, the utility model provides the following technical solutions:

[0008] In a first aspect, the utility model provides a gas particulate matter purification device for adsorbing and purifying particulate matter in gas, comprising:

[0009] A discharge unit, comprising at least one discharge beam electrically connected to an electrode of a DC high voltage power supply;

[0010] A first metal mesh adsorption unit, comprising a plurality of metal meshes stacked together, wherein the plurality of metal meshes are electrically connected to another electrode of the DC high voltage power supply;

[0011] Along the gas flow direction, the first metal mesh adsorption unit is located in front of the discharge unit and has a distance from the discharge unit, or the first metal mesh adsorption unit is located behind the discharge unit and has a distance from the discharge unit;

[0012] The discharge beam is arranged on a side of the discharge unit facing the first metal mesh adsorption unit;

[0013] The discharge beam of the discharge unit forms an electric field with the multi-layered metal mesh of the first metal mesh adsorption unit.

[0014] Furthermore, the gas particulate matter purification device provided by the utility model, wherein the first metal mesh adsorption unit further comprises a non-metallic rod, wherein the non-metallic rod is arranged on the end surface of the multi-layer metal mesh facing the discharge unit, wherein:

[0015] The non-metallic rods sense the high voltage of the discharge beam and form an induced electric field with the multi-layer metal mesh.

[0016] Furthermore, the utility model provides a gas particulate matter purification device, wherein the two first metal mesh adsorption units include non-metallic rods, the multi-layer metal mesh includes a first end surface facing the discharge unit and a second end surface facing away from the discharge unit, and the non-metallic rod is arranged on the first end surface of the multi-layer metal mesh, wherein,

[0017] The non-metallic rod senses the high voltage of the discharge electrode and forms an induced electric field with the multi-layer metal mesh.

[0018] Preferably, the non-metallic rod is made of nylon material.

[0019] Furthermore, the gas particulate matter purification device provided by the utility model, wherein the gas particulate matter purification device also includes a second metal mesh adsorption unit, including multiple layers of metal meshes stacked together;

[0020] Along the gas flow direction, the first metal mesh adsorption unit is located at one side of the discharge unit, and the second metal mesh adsorption unit is located at the other side of the discharge unit, and there is a distance between the second metal mesh adsorption unit and the discharge unit.

[0021] Furthermore, in the gas particulate matter purification device provided by the utility model, the multi-layer metal mesh of the second metal mesh adsorption unit is electrically connected to an electrode of a DC high voltage power supply.

[0022] Furthermore, in the gas particulate matter purification device provided by the utility model, the multi-layer metal mesh of the second metal mesh adsorption unit is not energized and can physically adsorb particulate matter in the gas.

[0023] Furthermore, in the gas particulate matter purification device provided by the utility model, the discharge beam includes a plurality of metal wires and / or conductive non-metal wires.

[0024] Furthermore, the discharge beam includes n metal wires and / or conductive non-metal wires, wherein n is greater than or equal to 10,000.

[0025] Furthermore, in the gas particulate matter purification device provided by the utility model, the discharge beam satisfies one or more of the following conditions:

[0026] (1) The discharge beam comprises n metal wires and / or conductive non-metal wires, wherein n is greater than or equal to 10,000;

[0027] (2) The diameter of the metal wire is in the range of 0.1-100um;

[0028] (3) The diameter of the conductive non-metallic wire is in the range of 0.1-100 um.

[0029] Furthermore, in the gas particulate matter purification device provided by the present invention, the discharge beam satisfies one or both of the following conditions:

[0030] (1) The discharge beam comprises 5,000 to 200,000 metal wires and / or conductive non-metal wires, preferably 5,000 to 80,000 metal wires and / or conductive non-metal wires; or the discharge beam comprises 10,000 to 80,000 metal wires and / or conductive non-metal wires.

[0031] (2) The diameter of the metal wire is in the range of 5-100um;

[0032] (3) The diameter of the conductive non-metallic wire is in the range of 5-100 um.

[0033] Furthermore, in the gas particulate matter purification device provided by the utility model, the metal wire comprises a stainless steel fiber wire, and more preferably, the single fiber diameter of the stainless steel fiber wire ranges from 5 to 100 um.

[0034] Furthermore, in the gas particulate matter purification device provided by the utility model, the conductive non-metallic wire is a carbon fiber wire, and the single fiber diameter of the carbon fiber wire ranges from 5 to 100 um.

[0035] Furthermore, the utility model provides a gas particulate matter purification device, wherein the discharge unit includes at least one discharge electrode group, and the discharge cluster includes a plurality of circumferentially arranged discharge beams; preferably, the discharge unit includes a plurality of discharge electrode groups with different radii and coaxially arranged. The discharge electrode group includes a plurality of discharge beams, which has a higher corona discharge efficiency than a single discharge beam. At the same time, the plurality of discharge beams are circumferentially arranged, and the discharge is more uniform, which is conducive to improving the efficiency of particle removal at the rear end.

[0036] Furthermore, the gas particulate matter purification device provided by the utility model, wherein the extension lines of the multiple circumferentially arranged discharge beams in the discharge electrode group form an angle with the axis of the discharge electrode group, preferably, the angle is 10-85°. In the utility model, the discharge beams in the circumferentially arranged discharge electrode group are inclined to the axial discharge, which can further improve the discharge efficiency, thereby improving the efficiency of particle removal at the rear end.

[0037] Furthermore, in the gas particulate matter purification device provided by the utility model, the plurality of circumferentially arranged discharge beams in the discharge electrode group are arranged along the axial direction of the discharge electrode group.

[0038] Furthermore, the gas particulate matter purification device provided by the utility model is characterized in that the voltage range of the discharge unit is -3kv to -60kv.

[0039] Furthermore, the utility model provides a gas particulate matter purification device, wherein the discharge beam includes a plurality of metal wires and / or non-metal wires, one end of the plurality of metal wires and / or non-metal wires are fixed together to form a fixed end, and the other end is a free end, and the free end faces the first metal mesh adsorption unit.

[0040] Furthermore, in the gas particulate matter purification device provided by the utility model, the discharge unit further includes a support plate, and the fixed end of the discharge beam is fixed on the support plate.

[0041] In a second aspect, the utility model provides an internal combustion engine exhaust emission treatment device with improved service life and low cost, comprising: a DPF device, which also includes a coarse particle filtering device, along the gas flow direction, the coarse particle filtering device is fluidically connected to the DPF device and is located before the DPF device, and the coarse particle filtering device is the above-mentioned gas particulate purification device.

[0042] Furthermore, the internal combustion engine exhaust emission treatment device provided by the utility model further includes a catalytic oxidation device, which is located between the coarse particle filter device and the DPF device, and the catalytic oxidation device is fluidically connected to the coarse particle filter device and the DPF device respectively.

[0043] Furthermore, the internal combustion engine exhaust emission treatment device provided by the utility model further includes a denitration device, and the denitration device is used to perform denitration treatment on the exhaust gas treated by the DPF device.

[0044] In the utility model, the gas includes one of air, engine exhaust, internal combustion engine exhaust, cooking fume gas, processing equipment waste gas, industrial waste gas and boiler fume.

[0045] Beneficial effects of the utility model

[0046] The gas particle purification device provided by the utility model can efficiently adsorb large particles in the gas, such as micron-sized particles. The large particles include dust and water vapor, and the removal efficiency reaches at least 70-80%.

[0047] The discharge bundle in the front discharge electrode group provided by the utility model includes thousands of metal wires and / or conductive non-metallic wires. The discharge bundle is fixed on a support plate and is in a brush-like shape. The discharge bundle adopts corona discharge, and the tip of each fiber filament at the free end is a discharge point, which significantly improves the discharge effect, improves the charging efficiency of particulate matter in the gas, and effectively reduces the generation of ozone to almost no level.

[0048] In the present invention, after testing, under the same purification efficiency requirements, compared with the gas particulate matter purification using an electrode rod or electrode wire and a metal mesh adsorption unit, when the discharge unit of the present invention is combined with the same metal mesh adsorption unit, the voltage required to be applied by the discharge unit of the present invention is less than the voltage required by an electrode rod or electrode wire, which has the advantages of low energy consumption and low cost.

[0049] The gas particulate matter purification device provided by the utility model can remove particulate matter in the gas. If the gas contains water vapor, the water vapor can also be effectively removed without causing a short circuit. This is because the water vapor in the gas is adsorbed in the multi-layer metal mesh, and there is a certain distance between the multi-layer metal mesh and the discharge beam.

[0050] The internal combustion engine exhaust gas treatment device provided by the utility model first performs a pre-coarse particle filtration before the existing DPF treatment, and uses the pre-coarse particle filtration device to remove some particles above the micron level. On the one hand, the resistance of the DPF device becomes smaller, which can reduce the back pressure, and on the other hand, it can extend the service life of the DPF and reduce costs. Specifically, in the existing exhaust treatment device, the DPF device needs to be replaced every 6 months. The utility model first passes through the pre-coarse particle filtration device before entering the DPF device, which can extend the use time of the DPF device by more than 3 times, that is, it can be replaced after more than 18 months, saving costs, while saving fuel consumption and reducing pollutant emissions. Secondly, the manganese oxide catalyst provided by the Chinese patent CN116809054A is used in the catalytic oxidation device of the utility model for catalytic oxidation treatment, which can replace the DOC treatment process in the prior art and reduce costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 This is one of the structural schematic diagrams of the gas particulate matter purification device involved in Example 1 of the utility model;

[0052] Figure 2 This is a second structural schematic diagram of the gas particulate matter purification device involved in Example 1 of the utility model;

[0053] Figure 3 This is a third structural schematic diagram of the gas particulate matter purification device involved in Example 1 of the utility model;

[0054] Figure 4 This is a fourth structural schematic diagram of the gas particulate matter purification device involved in Example 1 of the utility model;

[0055] Figure 5 This is a fifth structural schematic diagram of the gas particulate matter purification device involved in Example 1 of the utility model;

[0056] Figure 6 This is the sixth structural schematic diagram of the gas particulate matter purification device involved in Example 1 of the present utility model;

[0057] Figure 7 This is the seventh structural schematic diagram of the gas particulate matter purification device involved in Example 1 of the utility model;

[0058] Figure 8 This is one of the schematic diagrams of the discharge unit structure involved in Embodiment 2 of the present utility model;

[0059] Fig. 9 This is a schematic diagram of the direction of the discharge beam in the discharge unit involved in Example 2 of the utility model;

[0060] Fig.10This is a schematic diagram of the direction of the discharge beam in the discharge unit involved in Example 3 of the utility model;

[0061] Fig.11 It is a schematic diagram of an internal combustion engine exhaust emission treatment device according to Embodiment 4 of the present utility model. DETAILED DESCRIPTION

[0062] The following is a description of the implementation of the present invention by means of specific embodiments. People familiar with the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

[0063] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the utility model, so they have no technical substantive significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed by the utility model without affecting the effects and purposes that can be achieved by the utility model. At the same time, the terms "first", "second", and "third" in this specification are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0064] The embodiments of the present invention will be described in detail below in conjunction with the examples, but it will be appreciated by those skilled in the art that the following examples are only used to illustrate the present invention and should not be considered as limiting the scope of the present invention. If no specific conditions are specified in the examples, the conditions are carried out according to conventional conditions or the conditions recommended by the manufacturer. If the manufacturer is not specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0065] Example 1

[0066] This embodiment provides a gas particle purification device for adsorbing and purifying large particles including micron-sized particles in the gas, referring to Figure 1 and Figure 2 (The hollow arrow indicates the direction of gas flow), the gas particulate matter purification device 400 includes a discharge unit 410 and a first metal mesh adsorption unit 420, the discharge unit 410 includes at least one discharge beam 411 connected to a DC high voltage power supply, the first metal mesh adsorption unit 420 includes a first multi-layer metal mesh 421 stacked together and the first multi-layer metal mesh 421 is grounded; along the gas flow direction, the first metal mesh adsorption unit 420 is located in front of the discharge unit 410 and has a distance (refer to Figure 1 ), or the first metal mesh adsorption unit 420 is located behind the discharge unit 410 and has a distance from the discharge unit 410 (refer to Figure 2), the discharge beam 411 of the discharge unit 410 is directed toward the first metal mesh adsorption unit 420, the discharge beam 411 and the first multi-layer metal mesh 421 form an electric field, the gas passes through the electric field between the first metal mesh adsorption unit 420 and the discharge unit 410 for electric field purification treatment, and micron-sized particles, i.e., large particles, in the gas are removed, and the removal efficiency reaches at least 70-80%.

[0067] In this embodiment, the discharge beam 411 is electrically connected to the negative pole of the DC high voltage power supply, the first multi-layer metal mesh 421 is electrically connected to the positive pole of the DC high voltage power supply, the first multi-layer metal mesh 421 is grounded, the first multi-layer metal mesh 421 is at zero potential, a negative potential difference is formed between the discharge beam and the multi-layer metal mesh, the discharge beam 411 has a negative high voltage potential, and an electric field is formed between the discharge beam and the multi-layer metal mesh.

[0068] In the utility model, the multi-layer metal mesh can be a stainless steel mesh.

[0069] In one embodiment of the present invention, referring to Figure 3 and Figure 4 (The hollow arrow indicates the direction of gas flow), the first metal mesh adsorption unit 420 also includes a non-metallic rod 422, and the non-metallic rod 422 is arranged on the end face of the first multi-layer metal mesh 421 facing the discharge unit 410, that is, the first multi-layer metal mesh 421 includes a first end face 4211 facing the discharge unit 410 and a second end face 4212 facing away from the discharge unit 410, and the non-metallic rod 422 is arranged on the first end face 4211 of the first multi-layer metal mesh 421, wherein the non-metallic rod 422 senses the high voltage of the discharge beam 411 and forms an induced electric field with the first multi-layer metal mesh 421, and the non-metallic rod 422 discharges the gas after sensing the high voltage, so that the particles in the gas are charged, and the charged particles are adsorbed by the first multi-layer metal mesh 421, which also plays a role in removing large particles in the gas, further improving the gas purification efficiency.

[0070] In the utility model, the discharge beam 411 is electrically connected to the negative pole of the DC high-voltage power supply, the discharge beam 411 has a negative high-voltage potential, the non-metallic rod 422 induces a negative voltage, the first multi-layer metal mesh 421 is electrically connected to the positive pole of the DC high-voltage power supply, the first multi-layer metal mesh 421 is grounded, the first multi-layer metal mesh 421 is at zero potential, a negative potential difference is formed between the non-metallic rod 422 and the first multi-layer metal mesh 421, thereby forming an induced electric field between the non-metallic rod 422 and the first multi-layer metal mesh 421.

[0071] Specifically, refer to Figure 3, along the gas flow direction, the first metal mesh adsorption unit 420 is located in front of the discharge unit 410 and has a distance between it and the discharge unit 410, the first metal mesh adsorption unit 420 also includes a non-metallic rod 422, the first multi-layer metal mesh 421 includes a first end surface 4211 facing the discharge unit 410 and a second end surface 4212 facing away from the discharge unit 410, the non-metallic rod 422 is arranged on the first end surface 4211 of the first multi-layer metal mesh 421, the non-metallic rod 422 senses the high voltage of the discharge beam 411 and forms an induced electric field with the first multi-layer metal mesh 421.

[0072] Specifically, refer to Figure 4 , along the gas flow direction, the first metal mesh adsorption unit 420 is located behind the discharge unit 410 and has a distance between it and the discharge unit 410, the first metal mesh adsorption unit 420 also includes a non-metallic rod 422, the first multi-layer metal mesh 421 includes a first end surface 4211 facing the discharge unit 410 and a second end surface 4212 facing away from the discharge unit 410, the non-metallic rod 422 is arranged on the first end surface 4211 of the first multi-layer metal mesh 421, the non-metallic rod 422 senses the high voltage of the discharge beam 411 and forms an induced electric field with the first multi-layer metal mesh 421.

[0073] In one embodiment of the present invention, the non-metallic rod may be made of nylon material.

[0074] In one embodiment of the present invention, referring to Figure 5 The gas particulate matter purification device 400 also includes a second metal mesh adsorption unit 430, and the second metal mesh adsorption unit 430 includes a second multi-layer metal mesh 431; along the gas flow direction, the first metal mesh adsorption unit 420 is located on one side of the discharge unit 410, and the second metal mesh adsorption unit 430 is located on the other side of the discharge unit 410, referring to Figure 5 (The hollow arrow indicates the direction of gas flow). Figure 1A second metal mesh adsorption unit 430 is provided at the rear of the provided gas particulate matter purification device, that is, the second metal mesh adsorption unit 430 is located behind the discharge unit 410, the first metal mesh adsorption unit 420 is located in front of the discharge unit 410, the discharge unit 410 is arranged between the two metal mesh adsorption units (the first metal adsorption unit 420 and the second metal adsorption unit 430) and has a distance with the first metal adsorption unit 420 and the second metal adsorption unit 430 respectively, the discharge beam 411 is directed toward the first multi-layer metal mesh 421, the discharge beam 411 and the first multi-layer metal mesh 421 form an electric field, the gas passes through the electric field between the first metal adsorption unit 420 and the discharge unit 410 for electric field purification treatment, and most of the micron-sized particles, i.e., large particles, in the gas are removed. The gas after the large particles are removed and purified by the electric field enters the second metal adsorption unit 430, and the second multi-layer metal mesh 431 can further adsorb the particles in the gas through the physical adsorption of the multi-layer metal mesh, thereby improving the removal efficiency.

[0075] In one embodiment of the present invention, Figure 5 In the process, the second multi-layer metal mesh 431 of the second metal mesh adsorption unit 430 is electrically connected to the positive pole of the DC high-voltage power supply. The charged particles that have not been adsorbed after the electric field purification treatment between the first metal adsorption unit 420 and the discharge unit 410 are adsorbed by the positively charged second multi-layer metal mesh 431, thereby further improving the particle removal efficiency.

[0076] In one embodiment of the present invention, the second metal adsorption unit 430 may not be powered on. In this case, when the gas flows through the second metal adsorption unit 430, the multi-layer metal mesh is used to achieve physical adsorption of particulate matter in the gas.

[0077] In one embodiment of the present invention, referring to Figure 6 The gas particulate matter purification device 400 also includes a second metal mesh adsorption unit 430, and the second metal mesh adsorption unit 430 includes a second multi-layer metal mesh 431; along the gas flow direction, refer to Figure 6 (The hollow arrow indicates the direction of gas flow). Figure 2A second metal mesh adsorption unit 430 is provided in front of the provided gas particulate matter purification device, that is, the second metal mesh adsorption unit 430 is located in front of the discharge unit 410, the first metal mesh adsorption unit 420 is located behind the discharge unit 410, the discharge unit 410 is arranged between the two metal mesh adsorption units (the first metal adsorption unit 420 and the second metal adsorption unit 430) and has a distance with the first metal adsorption unit 420 and the second metal adsorption unit 430 respectively, the discharge beam 411 is directed toward the first multi-layer metal mesh 421, and the discharge beam 411 and the first multi-layer metal mesh 421 form an electric field; the gas first enters the second metal adsorption unit 430, and a part of the large particles in the gas can be adsorbed through the physical adsorption of the second multi-layer metal mesh 431, and at the same time, the gas is evenly distributed, so that the gas passes more evenly through the electric field between the first metal adsorption unit 420 and the discharge unit 410 at the back, and the gas is further purified in the electric field to remove micron-sized particles in the gas, thereby improving the ability to adsorb particles and improving the removal efficiency.

[0078] In one embodiment of the present invention, referring to Figure 7 (The hollow arrow indicates the direction of gas flow). Figure 5 On the basis of the provided gas particulate matter purification device, the first metal adsorption unit 420 includes a non-metallic rod 422, the first multi-layer metal mesh 421 includes a first end face facing the discharge unit 410 and a second end face facing away from the discharge unit 410, and the first non-metallic rod 422 is arranged on the first end face of the first multi-layer metal mesh 421, wherein the first non-metallic rod 422 senses the high voltage of the discharge beam 411 and forms an induced electric field with the first multi-layer metal mesh 421, and under the joint adsorption action of the induced electric field, the electric field formed between the first multi-layer metal mesh 421 and the discharge beam 411, and the second metal adsorption unit 430, large particles in the gas are effectively removed, and the removal efficiency reaches more than 80%.

[0079] It should be noted that, in the present invention, the distance between the first metal mesh adsorption unit 420 and the discharge unit 410 refers to: the vertical distance from the free end of the discharge beam 411 on the discharge unit 410 to the first multi-layer metal mesh 421 .

[0080] In this embodiment, the discharge beam 411 is electrically connected to the negative electrode of the DC high voltage power supply. Figure 1-Figure 7As shown, the discharge unit 410 includes at least one discharge beam 411, and the discharge beam 411 includes a plurality of metal wires and / or conductive non-metal wires (discharge materials). One end of the plurality of metal wires and / or non-metal wires is fixed together to form a fixed end, and the other end is a free end. The plurality of metal wires and / or non-metal wires at the free end are in a dispersed state. The discharge unit 410 also includes a support plate 412, and the fixed end of the discharge beam 411 is fixed on the support plate 412, and the support plate 412 is made of a conductive material. The discharge beam of the discharge unit is used for discharge after voltage is applied, and the discharge beam 411 is fixed on the conductive support plate 412. Under this design, one is to fix one or more discharge beams, and the other is that when the support plate is electrically connected to one pole of a DC power supply, the discharge beam 411 is also connected to the DC power supply. In the case of multiple discharge beams, multiple discharge beams can be connected to one power supply at the same time, and the structure is simple and convenient.

[0081] The discharge beam 411 includes n metal wires and / or conductive non-metal wires, wherein n is greater than or equal to 10,000; preferably, it includes more than 5,000 metal wires and / or conductive non-metal wires; preferably, it includes more than 10,000 metal wires and / or conductive non-metal wires; preferably, it includes 10,000 to 200,000 metal wires and / or conductive non-metal wires; preferably, it includes 10,000 to 80,000 metal wires and / or conductive non-metal wires. Typical but non-limiting numbers of metal wires and / or conductive non-metal wires are 10,000, 20,000, 30,000, 40,000, 50,000, 60,000, 80,000, 10,000, 20,000, 50,000, 150,000, 200,000, 250,000, 300,000, 400,000 or 500,000. The discharge beam composed of tens of thousands of metal wires and / or conductive non-metal wires is fixed on the support plate, similar to a brush. The discharge beam adopts corona discharge, and the tip of each wire at the free end is a discharge point, which significantly improves the discharge effect and effectively reduces the generation of ozone to almost no ozone.

[0082] In the present invention, the diameter of the metal wire ranges from 0.1 to 100 um; preferably, the diameter of the metal wire ranges from 5 to 100 um; typical but non-limiting diameters of the metal wire are: 0.1 um, 0.5 um, 1 um, 2 um, 3 um, 4 um, 5 um, 10 um, 12 um, 15 um, 20 um, 3 um, 40 um, 50 um, 60 um, 70 um, 80 um, 90 um, or 100 um. For example, the metal wire includes but is not limited to at least one of stainless steel fiber wire, titanium-chromium-aluminum alloy wire, titanium alloy wire, and nickel alloy wire. Preferably, the metal wire is stainless steel fiber wire, and the single fiber diameter of the stainless steel fiber wire ranges from 5 to 100 μm, and the carbon content in the discharge material is 90 to 99.9%, and the typical but non-limiting carbon content is 90%, 93%, 96%, or 99%.

[0083] In the present invention, the diameter of the conductive non-metallic wire ranges from 0.1 to 100 μm; preferably, the diameter of the conductive non-metallic wire ranges from 5 to 100 μm; typical but non-limiting diameters of the conductive non-metallic wire are: 0.1 μm, 0.5 μm, 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 10 μm, 12 μm, 15 μm, 20 μm, 3 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, or 100 μm. For example, the conductive non-metallic wire includes but is not limited to carbon fiber wire. The single fiber diameter of the carbon fiber wire ranges from 5 to 100 μm, and the typical but non-limiting single fiber diameter of the carbon fiber wire is: 0.1 μm, 0.5 μm, 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 10 μm, 12 μm, 15 μm, 20 μm, 3 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, or 100 μm.

[0084] In the utility model, the discharge beam of the discharge unit is used for corona discharge after voltage is applied, so that the gas is ionized, and the particles in the gas are charged. The discharge beam is directed toward the first multi-layer metal mesh of the first metal mesh adsorption unit. The discharge beam and the first multi-layer metal mesh are respectively connected to the negative electrode and the positive electrode of the power supply, and an electric field is formed. In the electric field, the charged particles in the gas are adsorbed on the first multi-layer metal mesh, and the removal efficiency reaches more than 80%. The particles include but are not limited to pollutants such as viruses, bacteria, and aerosols containing radiation. After the electric field treatment, the particles and aerosols containing viruses, bacteria, and radiation in the gas are removed, and sterile, radiation-free, and virus-free clean gas is obtained, achieving the effect of purifying the gas.

[0085] In the utility model, the corona discharge on the discharge unit adopts a DC negative high voltage, and the voltage range is -3kv to -30kv. Further, the voltage range is -3kv to -60kv, -4kv to -15kv, -8kV to -20kV, -10kV to -20kV, -15kV to -18kV or -10kV to -23kV. Typical but non-limiting voltages are: -3kv, -3.5kv, -4kv, -5kv, -6kv, -7kv, - 8kv, -9kv, -10kv, -12kv, -13kv, -14kv, -15kv, -16kv, -17kv, -18kv, -19kv, -20kv, -21kv, 22kv, -23kv, -24kv, -25kv, -26kv, 27kv, -28kv, -29kv, -30kv, -35kv, -40kv, -45kv, -50kv, -55kv or -60kv.

[0086] Example 2

[0087] This embodiment provides a gas particulate matter purification device, which is different from the first embodiment in the number of discharge electrode groups in the discharge unit and the direction in which the discharge beam is set. For other matters, refer to the first embodiment.

[0088] like Figure 8 As shown, this embodiment provides another discharge unit 20, the discharge unit 20 includes at least one discharge electrode group 22, the discharge cluster 22 includes a plurality of circumferentially arranged discharge beams 21, it can be understood that the discharge beams 41 in the discharge electrode group 22 are distributed in a circular shape, the discharge unit 20 also includes a support plate 23, the support plate 23 is circular, and the fixed end of the discharge beam 21 is arranged on the support plate 23. The plurality of discharge electrodes 22 are connected to the DC high voltage to realize the connection between the discharge unit 20 and the DC high voltage.

[0089] Continue to refer to Figure 8 The discharge unit 20 includes a plurality of discharge electrode groups 22 with different radii and coaxially arranged. For example, in this embodiment, the discharge unit 20 includes two discharge electrode groups 22. The discharge beam 41 in each discharge electrode group 22 is distributed in a circle. The radii of the circles where the two discharge electrode groups 22 are located are different, but the center positions of the circles are the same.

[0090] In this embodiment, Fig. 9 As shown, the discharge beam 21 is arranged along the axial direction BB' of the discharge electrode group 22, that is, the extension line of the discharge beam is parallel to the axis. It can also be said that in this embodiment, the discharge beam 21 is arranged along the airflow direction.

[0091] In the utility model, the discharge electrode group includes a plurality of discharge beams, which improves the corona discharge efficiency compared with a single discharge beam. At the same time, the plurality of discharge beams are arranged circumferentially, so the discharge is more uniform, which is beneficial to improving the efficiency of particle removal at the rear end.

[0092] In this embodiment, other features of the discharge unit 20 are the same as those of the discharge unit 410 in Embodiment 1, and reference may be made to Embodiment 1.

[0093] Example 3

[0094] This embodiment provides a gas particulate matter purification device, which is different from Embodiment 1-2 in the number of discharge electrode groups in the discharge unit and the setting direction of the discharge beam. For other details, refer to Embodiment 1-2.

[0095] In this embodiment, refer to Fig.10 The discharge unit 20' includes a discharge electrode group 22', and the discharge cluster 22' includes a plurality of circumferentially arranged discharge beams 21'. The discharge beams 21' in the discharge electrode group 22' are distributed in a circular shape.

[0096] In this embodiment, the extended line of the discharge beam 21 forms an angle α with the axis BB' of the discharge electrode group. Preferably, the angle α is 10-85°.

[0097] In the utility model, the discharge beam in the circumferentially arranged discharge electrode group is inclined to the axial discharge, which can further improve the discharge efficiency, thereby improving the particle removal efficiency at the rear end.

[0098] In the present invention, after testing, under the same purification efficiency requirements, compared with the gas particulate matter purification using an electrode rod or electrode wire and a metal mesh adsorption unit, when the discharge unit of the present invention is combined with the same metal mesh adsorption unit, the voltage required to be applied by the discharge unit of the present invention is less than the voltage required by an electrode rod or electrode wire, which has the advantages of low energy consumption and low cost.

[0099] Example 4

[0100] Some embodiments of the present invention provide an internal combustion engine exhaust gas treatment device, such as Fig.11 As shown, it includes a coarse particle filter device 400, a catalytic oxidation device 500, a DPF device 600, and a denitration device 700 which are arranged in sequence and fluidically connected along the gas flow direction, wherein the coarse particle filter device 400 uses an electric field to adsorb particles larger than micrometers in the exhaust gas; the exhaust gas treated by the coarse particle filter device 400 enters the catalytic oxidation device 500, and a catalyst is placed in the catalytic oxidation device 500 to catalytically oxidize one or more substances among nitrogen monoxide, carbon monoxide and hydrocarbons in the exhaust gas, thereby removing at least part of one or more of nitrogen monoxide, carbon monoxide and hydrocarbons in the exhaust gas; the exhaust gas treated by catalytic oxidation in the catalytic oxidation device 500 enters the DPF device 600, and the DPF device 600 performs particle filtering on the exhaust gas, and can filter out large particles in the exhaust gas, such as particles with a particle size larger than micrometers; the exhaust gas treated by filtering large particles in the DPF device 600 enters the denitration device 700 for denitration treatment, and the denitration treatment can be performed by using the method provided by the prior art using urea or ammonia as a reducing agent.

[0101] The DPF device 600 in the present invention is an existing DPF device.

[0102] The catalytic oxidizing device 500 in the present invention is filled with a catalytic oxidant, which can refer to the manganese oxide catalyst provided by Chinese patent CN116809054A.

[0103] The medium-coarse particle filtering device 400 of the utility model selects the gas particulate purification device provided by any one of Examples 1-3, wherein the first multi-layer metal mesh 421 and / or the second multi-layer metal mesh 431 can be taken out and cleaned after a period of use to achieve regeneration, and the cleaned first multi-layer metal mesh 421 and / or the second multi-layer metal mesh 431 can be reused to save costs.

[0104] Some embodiments of the present invention also provide a method for treating exhaust gas from an internal combustion engine with a longer service life and lower cost, comprising the following steps:

[0105] S1: Pre-coarse particle filtration

[0106] S11: Exhaust gas is passed into the coarse particle filter device 400, which applies electric field and / or physical adsorption to the exhaust gas entering therein, and the particles are adsorbed on the first multi-layer metal mesh 421 and / or the second multi-layer metal mesh 431, thereby removing particles larger than micron size; 70-80% of large particles are removed to reduce the blockage of DPF.

[0107] S12: After a period of electric field adsorption treatment, the first multi-layer metal mesh 421 and / or the second multi-layer metal mesh 431 can be taken out and cleaned to achieve regeneration. The cleaned first multi-layer metal mesh 421 and / or the second multi-layer metal mesh 431 can be reused to save costs.

[0108] S2: Catalytic oxidation treatment

[0109] The exhaust gas adsorbed by the coarse particle filter device 400 enters the catalytic oxidation device 500 for catalytic oxidation treatment to remove at least part of one or more substances among nitrogen monoxide, carbon monoxide and hydrocarbons in the exhaust gas of the internal combustion engine.

[0110] S3: DPF treatment

[0111] The exhaust gas after catalytic oxidation treatment is passed into the DPF device to capture particulate matter and remove large particles in the exhaust gas.

[0112] S4: Denitrification treatment:

[0113] The exhaust gas of the internal combustion engine after the particulate matter capture treatment enters the denitration device 700 for denitration treatment, and the denitration treatment is performed using urea or ammonia as a reducing agent.

[0114] In this embodiment, before the exhaust gas enters the DPF device 600 for particulate matter filtering, it is first processed by the coarse particle filtering device 400 to remove some particulate matter larger than micron size. Through such a design, some micron-sized particles have been adsorbed due to the adsorption by the electric field before physical adsorption. On the one hand, the resistance of the DPF device is reduced, which can reduce the back pressure. On the other hand, it can extend the service life and reduce the cost, while saving fuel consumption and reducing pollutant emissions.

[0115] References throughout the specification to "an example," "one embodiment," or "an embodiment" indicate that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearance of "an example," "in one embodiment," or "in an embodiment" in various places throughout the specification need not all refer to the same embodiment. Additionally, the particular features, structures, or characteristics may be combined in any manner in one or more embodiments.

[0116] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed in the present invention shall still be covered by the claims of the present invention.

Claims

1. A gas particulate matter purification device, used for adsorbing and purifying particulate matter in gas, characterized in that: include: A discharge unit, comprising at least one discharge beam electrically connected to an electrode of a DC high voltage power supply; A first metal mesh adsorption unit, comprising a plurality of metal meshes stacked together, wherein the plurality of metal meshes are electrically connected to another electrode of the DC high voltage power supply; Along the gas flow direction, the first metal mesh adsorption unit is located in front of the discharge unit and has a distance from the discharge unit, or the first metal mesh adsorption unit is located behind the discharge unit and has a distance from the discharge unit; The discharge beam is arranged on a side of the discharge unit facing the first metal mesh adsorption unit; The discharge beam of the discharge unit forms an electric field with the multi-layered metal mesh of the first metal mesh adsorption unit.

2. The gas particulate matter purification device according to claim 1, characterized in that: The first metal mesh adsorption unit further includes a non-metal rod, which is arranged on the end surface of the multi-layer metal mesh facing the discharge unit, wherein: The non-metallic rods sense the high voltage of the discharge beam and form an induced electric field with the multi-layer metal mesh.

3. The gas particulate matter purification device according to claim 1 or 2, characterized in that: The gas particulate matter purification device further comprises a second metal mesh adsorption unit, comprising a plurality of metal meshes stacked together; Along the gas flow direction, the first metal mesh adsorption unit is located at one side of the discharge unit, and the second metal mesh adsorption unit is located at the other side of the discharge unit, and there is a distance between the second metal mesh adsorption unit and the discharge unit.

4. The gas particulate matter purification device according to claim 3, characterized in that: The multi-layer metal mesh of the second metal mesh adsorption unit is electrically connected to an electrode of a DC high voltage power supply.

5. The gas particulate matter purification device according to claim 1, characterized in that: The discharge beam includes a plurality of metallic wires and / or conductive non-metallic wires.

6. The gas particulate matter purification device according to claim 5, characterized in that: The discharge beam satisfies one or more of the following conditions: (1) The discharge beam comprises n metal wires and / or conductive non-metal wires, wherein n is greater than or equal to 10,000; (2) The diameter of the metal wire is in the range of 0.1-100um; (3) The diameter of the conductive non-metallic wire is in the range of 0.1-100 um.

7. The gas particulate matter purification device according to claim 6, characterized in that: The discharge beam satisfies one or both of the following conditions: (1) The discharge beam comprises 5,000 to 200,000 metal wires and / or conductive non-metal wires; (2) The diameter of the metal wire is in the range of 5-100um; (3) The diameter of the conductive non-metallic wire is in the range of 5-100 um.

8. The gas particulate matter purification device according to claim 7, characterized in that: The discharge beam comprises 5,000 to 80,000 metal wires and / or conductive non-metal wires.

9. The gas particulate matter purification device according to claim 6, characterized in that: The metal wire includes at least one of stainless steel fiber wire, titanium-chromium-aluminum alloy wire, titanium alloy wire, and nickel alloy wire, or the conductive non-metallic wire is carbon fiber wire.

10. The gas particulate matter purification device according to claim 9, characterized in that: The single fiber diameter of the stainless steel fiber filament ranges from 5 to 100 um.

11. The gas particulate matter purification device according to claim 9, characterized in that: The single fiber diameter of carbon fiber filaments ranges from 5 to 100 um.

12. The gas particulate matter purification device according to claim 1, characterized in that: The discharge unit includes at least one discharge electrode group, and the discharge electrode group includes a plurality of circumferentially arranged discharge beams.

13. The gas particulate matter purification device according to claim 12, characterized in that: The discharge unit includes a plurality of discharge electrode groups with different radii and coaxially arranged.

14. The gas particulate matter purification device according to claim 13, characterized in that: The extended lines of the plurality of circumferentially arranged discharge beams in the discharge electrode group form an angle with the axis of the discharge electrode group.

15. The gas particulate matter purification device according to claim 14, characterized in that: The angle is 10-85°.

16. The gas particulate matter purification device according to claim 12, characterized in that: A plurality of circumferentially arranged discharge beams in the discharge electrode group are arranged along the axial direction of the discharge electrode group.

17. The gas particulate matter purification device according to claim 1, characterized in that: The voltage range of the discharge unit is -3kv to -60kv.

18. The gas particulate matter purification device according to claim 1, characterized in that: The discharge beam comprises a plurality of metal wires and / or non-metal wires, one end of the plurality of metal wires and / or non-metal wires are fixed together to form a fixed end, and the other end is a free end, and the free end faces the first metal mesh adsorption unit.

19. The gas particulate matter purification device according to claim 13, characterized in that: The discharge unit further includes a support plate, and a fixed end of the discharge beam is fixed on the support plate.

20. An internal combustion engine exhaust emission treatment device, comprising: The DPF device is characterized in that it also includes a coarse particle filtering device, which is fluidically connected to the DPF device and located before the DPF device along the gas flow direction. The coarse particle filtering device is the gas particulate purification device described in claims 1-19.

21. The exhaust gas treatment device for an internal combustion engine according to claim 20, characterized in that: A catalytic oxidation device is also included. The catalytic oxidation device is located between the coarse particle filtering device and the DPF device. The catalytic oxidation device is in fluid communication with the coarse particle filtering device and the DPF device, respectively.

22. The exhaust gas treatment device for an internal combustion engine according to claim 20, characterized in that: It also includes a denitration device, which is used to denitrate the exhaust gas treated by the DPF device.

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