Gas particulate purification device and exhaust emission treatment device for internal combustion engine

Abstract

A kind of gas particulate purification device and internal combustion engine exhaust emission treatment device, for adsorbing and purifying the particulate in gas.The gas particulate purification device includes: discharge unit, including at least one discharge beam with the electrode of direct current high voltage power supply electrically connected;First metal screen adsorption unit, including multiple layers of metal screen stacked together, the multiple layers of metal screen with another electrode of direct current high voltage power supply electrically connected;Along the direction of gas flow, the first metal screen adsorption unit is located in front of the discharge unit and has distance between the discharge unit, or the first metal screen adsorption unit is located behind the discharge unit and has distance between the discharge unit;The discharge beam is arranged on the side of the discharge unit towards the first metal screen adsorption unit;The discharge beam of the discharge unit and the multiple layers of metal screen of the first metal screen adsorption unit form electric field.

Description

Technical Field

[0001] This invention relates to a gas particulate matter purification device and an internal combustion engine exhaust gas treatment device. Background Technology

[0002] As people become increasingly environmentally conscious, their understanding of and demand for purification of air pollutants (including but not limited to smoke, dust, VOCs, and engine exhaust) are constantly rising. Consequently, more and better purification technologies are being installed and used in vehicles, factories, and homes. Among these technologies, electrostatic precipitator technology is widely used. The principle of electrostatic precipitator technology is that gas is ionized when it passes through an electrostatic field. Particulate matter in the gas combines with charged ions and tends to move towards the electrode with the opposite polarity of the charged ions, thus depositing. Therefore, the particulate matter removal rate is related to the charge efficiency of the particulate matter. The core electrostatic field is mostly composed of an adsorption plate and a cathode wire (discharge electrode) set in the adsorption plate. Therefore, the technology of the adsorption plate and the discharge electrode has become key to improving the particulate matter removal rate.

[0003] Existing technologies still suffer from the problem of difficulty in controlling the assembly precision of the discharge electrode and the adsorption electrode. This not only results in high manufacturing costs but also leads to arcing due to low assembly precision, as well as poor particulate matter removal rate and purification effect.

[0004] Internal combustion engine exhaust contains a large amount of particulate matter and pollutants such as nitrogen oxides. Current technology uses particulate filters (DPF) to filter particulate matter. DPF can filter out large particles, but the back pressure of DPF is high, which leads to increased engine fuel consumption and energy consumption, and significantly increases operating costs.

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

[0006] The present invention provides a gas particulate matter purification device to achieve at least one of the following objectives: removing large particulate pollutants and / or particulate matter (including but not limited to flue gas, dust, VOCs and engine exhaust) from the gas; and also provides an internal combustion engine exhaust emission treatment device with improved lifespan and low cost to improve exhaust gas purification efficiency, reduce back pressure, reduce fuel consumption and reduce costs.

[0007] To achieve the above and other related objectives, the present invention provides the following technical solution:

[0008] In a first aspect, the present invention provides a gas particulate matter purification device for adsorbing particulate matter in purified gas, comprising:

[0009] The discharge unit includes at least one discharge beam electrically connected to one electrode of a DC high-voltage power supply;

[0010] The first metal mesh adsorption unit includes multiple layers of metal mesh stacked together, and the multiple layers of metal mesh 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 between them, or the first metal mesh adsorption unit is located behind the discharge unit and has a distance between them.

[0012] The discharge beam is positioned on the 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 multilayer metal mesh of the first metal mesh adsorption unit.

[0014] Furthermore, in the gas particulate matter purification device provided by the present invention, the first metal mesh adsorption unit further includes a non-metallic rod, which is disposed on the end face of the multi-layer metal mesh facing the discharge unit.

[0015] The non-metallic rod senses the high voltage of the discharge beam and forms an induced electric field with the multilayer metal mesh.

[0016] Furthermore, in the gas particulate matter purification device provided by the present invention, the two first metal mesh adsorption units include non-metallic rods, the multi-layer metal mesh includes a first end face facing the discharge unit and a second end face facing away from the discharge unit, and the non-metallic rods are disposed on the first end face of the multi-layer metal mesh.

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

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

[0019] Furthermore, the gas particulate matter purification device provided by the present invention further includes a second metal mesh adsorption unit, comprising multiple layers of metal mesh stacked together.

[0020] Along the gas flow direction, the first metal mesh adsorption unit is located on one side of the discharge unit, and the second metal mesh adsorption unit is located on the other side of the discharge unit, with 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 present invention, the multi-layer metal mesh of the second metal mesh adsorption unit is electrically connected to one electrode of a DC high-voltage power supply.

[0022] Furthermore, in the gas particulate matter purification device provided by the present invention, 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 present invention, the discharge beam comprises a plurality of metal wires and / or conductive non-metal wires.

[0024] Furthermore, the discharge beam comprises n metal wires and / or conductive non-metal wires, wherein n is greater than or equal to 0.1 million.

[0025] Furthermore, in the gas particulate matter purification device provided by the present invention, 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 0.1 million;

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

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

[0029] Furthermore, in the gas particulate matter purification device provided by the present invention, the discharge beam satisfies one or two 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 5-100 μm;

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

[0033] Furthermore, in the gas particulate matter purification device provided by the present invention, the metal wire includes stainless steel fiber wire, and more preferably, the single fiber diameter of the stainless steel fiber wire is in the range of 5-100 μm.

[0034] Furthermore, in the gas particulate matter purification device provided by the present invention, 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 μm.

[0035] Furthermore, in the gas particulate matter purification device provided by the present invention, the discharge unit includes at least one discharge electrode group, and the discharge electrode group includes multiple circumferentially arranged discharge beams; preferably, the discharge unit includes multiple discharge electrode groups with different radii and coaxially arranged. The discharge electrode group includes multiple discharge beams, which improves the corona discharge efficiency compared to a single discharge beam. Simultaneously, the circumferential arrangement of multiple discharge beams results in more uniform discharge, which is beneficial for improving the downstream particulate matter removal efficiency.

[0036] Furthermore, in the gas particulate matter purification device provided by the present invention, the extension 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, preferably, the angle is 10-85°. In the present invention, the discharge beams in the circumferentially arranged discharge electrode group are inclined to discharge axially, which can further improve the discharge efficiency, thereby improving the particulate matter removal efficiency at the downstream end.

[0037] Furthermore, in the gas particulate matter purification device provided by the present invention, a 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 present invention is characterized in that the voltage range of the discharge unit is -3kV to -60kV.

[0039] Furthermore, in the gas particulate matter purification device provided by the present invention, 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 is fixed together to form a fixed end, and the other end is a free end, the free end facing the first metal mesh adsorption unit.

[0040] Furthermore, in the gas particulate matter purification device provided by the present invention, 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 present invention provides an internal combustion engine exhaust emission treatment device with improved lifespan and lower cost, comprising: a DPF device, wherein the device further comprises a coarse particulate filter along the gas flow direction, the coarse particulate filter being in fluid communication with the DPF device and located before the DPF device, the coarse particulate filter being the aforementioned gas particulate matter purification device.

[0042] Furthermore, the internal combustion engine exhaust emission treatment device provided by the present invention further includes a catalytic oxidation device, which is located between the coarse particulate filter and the DPF device, and is in fluid communication with both the coarse particulate filter and the DPF device.

[0043] Furthermore, the internal combustion engine exhaust gas treatment device provided by the present invention further includes a denitrification device, which performs denitrification treatment on the exhaust gas treated by the DPF device.

[0044] In this invention, the gas includes one of the following: air, engine exhaust, internal combustion engine exhaust, cooking fumes, processing equipment exhaust, industrial exhaust, and boiler flue gas.

[0045] Beneficial effects of the present invention

[0046] The gas particulate matter purification device provided by the present invention can efficiently adsorb large particulate matter in gas, such as micron-sized particles, including dust and water vapor, with a removal efficiency of at least 70-80%.

[0047] The discharge beam in the pre-discharge electrode assembly provided by this invention comprises thousands of metal wires and / or conductive non-metal wires. The discharge beam is fixed on a support plate in a brush-like shape. The discharge beam uses corona discharge, and the tip of each fiber at the free end is a discharge point, which significantly improves the discharge effect, increases the charging efficiency of particulate matter in the gas, and effectively reduces the ozone production to almost zero.

[0048] In this invention, tests have shown that, under the same purification efficiency requirements, compared to purifying particulate matter in a gas using a single electrode rod or wire and a metal mesh adsorption unit, the discharge unit of this invention, when combined with the same metal mesh adsorption unit, requires less voltage to be applied than a single electrode rod or wire. This results in advantages of low energy consumption and low cost.

[0049] The gas particulate matter purification device provided by the present invention can remove particulate matter from gas. If the gas contains water vapor, it can also effectively remove water vapor 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 emission treatment device provided by this invention performs a pre-filter (coarse particulate filter) before the existing DPF treatment. This pre-filter removes some particles larger than micrometers, reducing the resistance of the DPF and lowering back pressure. It also extends the DPF's lifespan, reducing costs. Specifically, in existing exhaust treatment devices, the DPF needs to be replaced every 6 months. This invention, by pre-filtering the exhaust before it enters the DPF, extends the DPF's lifespan by more than three times, to more than 18 months, saving costs, fuel, and reducing pollutant emissions. Furthermore, the manganese oxide catalyst provided by Chinese Patent CN116809054A is used in the catalytic oxidation device of this invention for catalytic oxidation treatment, replacing the existing DOC treatment process and further reducing costs. Attached Figure Description

[0051] Figure 1 This is one of the structural schematic diagrams of the gas particulate matter purification device involved in Embodiment 1 of the present invention;

[0052] Figure 2 This is a second schematic diagram of the gas particulate matter purification device involved in Embodiment 1 of the present invention;

[0053] Figure 3 This is the third schematic diagram of the gas particulate matter purification device involved in Embodiment 1 of the present invention;

[0054] Figure 4 This is the fourth schematic diagram of the gas particulate matter purification device involved in Embodiment 1 of the present invention;

[0055] Figure 5 This is the fifth schematic diagram of the gas particulate matter purification device involved in Embodiment 1 of the present invention;

[0056] Figure 6 This is the sixth schematic diagram of the gas particulate matter purification device involved in Embodiment 1 of the present invention;

[0057] Figure 7 This is the seventh schematic diagram of the gas particulate matter purification device involved in Embodiment 1 of the present invention;

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

[0059] Figure 9 This is a schematic diagram of the discharge beam direction in the discharge unit involved in Embodiment 2 of the present invention;

[0060] Figure 10 This is a schematic diagram of the discharge beam direction in the discharge unit involved in Embodiment 3 of the present invention;

[0061] Figure 11 This is a schematic diagram of the internal combustion engine exhaust gas treatment device in Embodiment 4 of the present invention. Detailed Implementation

[0062] The following specific embodiments illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0063] It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding and reading. They are not intended to limit the implementation conditions of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to the size, without affecting the effectiveness and objectives of the invention, should still fall within the scope of the technical content disclosed in the invention. Furthermore, the terms "first," "second," and "third" in this specification are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0064] The embodiments of the present invention will be described in detail below with reference to examples. However, those skilled in the art will understand that the following examples are for illustrative purposes only and should not be considered as limiting the scope of the invention. Unless otherwise specified in the examples, conventional conditions or conditions recommended by the manufacturer are followed. Reagents or instruments whose manufacturers are not specified are all commercially available conventional products.

[0065] Example 1

[0066] This embodiment provides a gas particulate matter purification device for adsorbing and purifying large particulate matter, including micron-sized particles, in gas. (Refer to...) Figure 1 and Figure 2 (Hollow arrows indicate 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 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 between it and the discharge unit 410 (see reference). Figure 1 ), or 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 (see reference). 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 multilayer metal mesh 421 form an electric field. The gas is purified by the electric field between the first metal mesh adsorption unit 420 and the discharge unit 410, removing micron-sized particles, i.e. large particles, from the gas. The removal efficiency is at least 70-80%.

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

[0068] In this invention, the multilayer metal mesh can be a stainless steel mesh.

[0069] In one embodiment of the present invention, reference is made 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. The non-metallic rod 422 is disposed 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. The non-metallic rod 422 is disposed on the first end face 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. After sensing the high voltage, the non-metallic rod 422 discharges the gas, causing the particulate matter in the gas to become charged. The charged particulate matter is adsorbed by the first multi-layer metal mesh 421, which also plays a role in removing large particulate matter from the gas and further improving the gas purification efficiency.

[0070] In this invention, the discharge beam 411 is electrically connected to the negative terminal of the DC high-voltage power supply, and the discharge beam 411 carries a negative high-voltage potential. The non-metallic rod 422 is induced to receive a negative voltage. The first multilayer metal mesh 421 is electrically connected to the positive terminal of the DC high-voltage power supply, and the first multilayer metal mesh 421 is grounded. The first multilayer metal mesh 421 is at zero potential, and a negative potential difference is formed between the non-metallic rod 422 and the first multilayer metal mesh 421, thereby forming an induced electric field between the non-metallic rod 422 and the first multilayer 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 them. The first metal mesh adsorption unit 420 also includes a non-metallic rod 422. The first multilayer 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. The non-metallic rod 422 is disposed on the first end face 4211 of the first multilayer 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 multilayer metal mesh 421.

[0072] Specifically, refer to Figure 4Along the gas flow direction, the first metal mesh adsorption unit 420 is located behind the discharge unit 410 and has a distance between them. The first metal mesh adsorption unit 420 also includes a non-metallic rod 422. The first multilayer 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. The non-metallic rod 422 is disposed on the first end face 4211 of the first multilayer 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 multilayer 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, reference is made to Figure 5 The gas particulate matter purification device 400 further includes a second metal mesh adsorption unit 430, which 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. (Refer to...) Figure 5 (The hollow arrow indicates the direction of gas flow), in Figure 1 A second metal mesh adsorption unit 430 is provided behind the gas particulate matter purification device, that is, the second metal mesh adsorption unit 430 is located behind the discharge unit 410, and the first metal mesh adsorption unit 420 is located in front of the discharge unit 410. The discharge unit 410 is positioned between the two metal mesh adsorption units (the first metal adsorption unit 420 and the second metal adsorption unit 430) and is separated from the first metal adsorption unit 420 and the second metal adsorption unit 430 by a distance. The discharge beam 411 is directed toward the first multilayer metal mesh 421, and the discharge beam 411 and the first multilayer metal mesh 421 form an electric field. The gas undergoes electric field purification treatment through the electric field between the first metal adsorption unit 420 and the discharge unit 410, removing most of the micron-sized particles, i.e., large particles, from the gas. The gas that has been purified by removing large particles through the electric field then enters the second multilayer metal mesh 431 of the second metal adsorption unit 430. Through the physical adsorption of the multilayer metal mesh, the particles in the gas can be further adsorbed, improving the removal efficiency.

[0075] In one embodiment of the present invention, such as Figure 5 In the process, the second multilayer metal mesh 431 of the second metal mesh adsorption unit 430 is electrically connected to the positive electrode of the DC high voltage power supply. Charged particles that have not been adsorbed after being purified by the electric field between the first metal adsorption unit 420 and the discharge unit 410 are adsorbed by the positively charged second multilayer metal mesh 431, further improving the particle removal efficiency.

[0076] In one embodiment of the present invention, the second metal adsorption unit 430 may also be de-energized. In this case, when gas flows through the second metal adsorption unit 430, the physical adsorption of particulate matter in the gas is achieved by using a multi-layer metal mesh.

[0077] In one embodiment of the present invention, reference is made to Figure 6 The gas particulate matter purification device 400 further includes a second metal mesh adsorption unit 430, which 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), in Figure 2 The provided gas particulate matter purification device has a second metal mesh adsorption unit 430 in front of it, that is, the second metal mesh adsorption unit 430 is located in front of the discharge unit 410, and the first metal mesh adsorption unit 420 is located behind the discharge unit 410. The discharge unit 410 is positioned between the two metal mesh adsorption units (the first metal adsorption unit 420 and the second metal adsorption unit 430) and is spaced apart from the first metal adsorption unit 420 and the second metal adsorption unit 430 respectively. The discharge beam 411 is directed toward the first multilayer metal mesh 421, and the discharge beam 411 and the first multilayer metal mesh 421 form an electric field. The gas first enters the second metal adsorption unit 430, and through the physical adsorption of the second multilayer metal mesh 431, a portion of the large particles in the gas can be adsorbed. At the same time, it plays a role in equalizing the gas flow, allowing the gas to pass more evenly through the electric field between the first metal adsorption unit 420 and the discharge unit 410. In this electric field, the gas is further purified, removing micron-sized particles from the gas, improving the adsorption capacity of particles, and improving the removal efficiency.

[0078] In one embodiment of the present invention, reference is made to Figure 7 (The hollow arrow indicates the direction of gas flow), in Figure 5 Based on the provided gas particulate matter purification device, the first metal adsorption unit 420 includes a non-metallic rod 422, and 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. The first non-metallic rod 422 is disposed on the first end face of the first multi-layer metal mesh 421. 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. Under the combined adsorption effect 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 particulate matter in the gas is effectively removed, and the removal efficiency reaches more than 80%.

[0079] It should be noted that, in this 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 multilayer metal mesh 421.

[0080] In this embodiment, the discharge beam 411 is electrically connected to the negative terminal of the DC high-voltage power supply, such as... Figures 1-7 As shown, the discharge unit 410 includes at least one discharge beam 411. The discharge beam 411 includes multiple metal wires and / or conductive non-metal wires (discharge material). One end of each metal wire and / or non-metal wire is fixed together to form a fixed end, and the other end is a free end. The multiple metal wires and / or non-metal wires at the free end are dispersed. The discharge unit 410 also includes a support plate 412. The fixed end of the discharge beam 411 is fixed on the support plate 412, which is made of conductive material. The discharge beam of the discharge unit is used for discharge after a voltage is applied. The discharge beam 411 is fixed on the conductive support plate 412. With this design, one or more discharge beams are fixed, and 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 simultaneously. The structure is simple and convenient.

[0081] The discharge beam 411 comprises n metal wires and / or conductive non-metal wires, wherein n is greater than or equal to 1,000; preferably, it comprises more than 5,000 metal wires and / or conductive non-metal wires; preferably, it comprises more than 10,000 metal wires and / or conductive non-metal wires; preferably, it comprises 10,000 to 200,000 metal wires and / or conductive non-metal wires; preferably, it comprises 10,000 to 80,000 metal wires and / or conductive non-metal wires. Typical, but not limiting, quantities of metal wires and / or conductive non-metal wires are 1,000, 2,000, 3,000, 4,000, 5,000, 6,000, 8,000, 10,000, 20,000, 50,000, 150,000, 200,000, 250,000, 300,000, 400,000, or 500,000. The discharge beam, composed of thousands of metal wires and / or conductive non-metal wires, is fixed to a support plate in a brush-like shape. The discharge beam employs corona discharge, with the tip of each free end of the wire serving as a discharge point, significantly improving the discharge effect and effectively reducing ozone production to almost zero.

[0082] In this invention, the diameter of the metal wire ranges from 0.1 to 100 μm; preferably, the diameter ranges from 5 to 100 μm; typical but non-limiting diameters of the metal 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 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, 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 90-99.9%, typically but non-limiting carbon content is 90%, 93%, 96%, or 99%.

[0083] In this invention, the diameter of the conductive non-metallic wire ranges from 0.1 to 100 μm; preferably, the diameter ranges from 5 to 100 μm; typical but non-limiting conductive non-metallic wire diameters 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 filaments. The single fiber diameter of the carbon fiber filament ranges from 5 to 100 μm, and typical but non-limiting single fiber diameters 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.

[0084] In this invention, the discharge beam of the discharge unit is subjected to a voltage for corona discharge, ionizing the gas and charging the particulate matter in the gas. The discharge beam is directed towards 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 and positive terminals of the power supply, forming an electric field. In this electric field, the charged particulate matter in the gas is adsorbed onto the first multi-layer metal mesh, achieving a removal efficiency of over 80%. The particulate matter includes, but is not limited to, contaminants such as viruses, bacteria, and radiation-containing aerosols. By treating the gas with the electric field, particulate matter and aerosols containing viruses, bacteria, and radiation are removed, resulting in sterile, radiation-free, and virus-free clean gas, thus achieving the effect of gas purification.

[0085] In this invention, the corona discharge on the discharge unit adopts a DC negative high voltage with a voltage range of -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... -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 differs from Embodiment 1 in the number of discharge electrode groups in the discharge unit and the direction of the discharge beam. Other aspects are the same as in Embodiment 1.

[0088] like Figure 8 As shown, this embodiment provides another discharge unit 20, which includes at least one discharge electrode group 22. The discharge electrode group 22 includes multiple circumferentially arranged discharge beams 21. It can be understood that the discharge beams 41 in the discharge electrode group 22 are circularly distributed. The discharge unit 20 also includes a support plate 23, which is circular, and the fixed ends of the discharge beams 21 are disposed on the support plate 23. The multiple discharge electrodes 22 are connected to a DC high-voltage power supply to realize the connection between the discharge unit 20 and the DC high-voltage power supply.

[0089] Continue to refer to Figure 8 The discharge unit 20 includes multiple discharge electrode groups 22 with different radii and coaxial arrangement. For example, in this embodiment, the discharge unit 20 includes two discharge electrode groups 22. The discharge beams 41 in each discharge electrode group 22 are distributed in a circle. The radii of the circles in the two discharge electrode groups 22 are different, but the center positions are the same.

[0090] In this embodiment, as Figure 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. In other words, in this embodiment, the discharge beam 21 is arranged along the airflow direction.

[0091] In this invention, the discharge electrode group includes multiple discharge beams, which improves the corona discharge efficiency compared to a single discharge beam. At the same time, the multiple discharge beams are arranged circumferentially, resulting in more uniform discharge and improving the efficiency of particulate matter removal at the downstream end.

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

[0093] Example 3

[0094] This embodiment provides a gas particulate matter purification device, which differs from Embodiments 1-2 in the number of discharge electrode groups in the discharge unit and the direction of the discharge beam. Other aspects are the same as in Embodiments 1-2.

[0095] In this embodiment, refer to Figure 10 The discharge unit 20' includes a discharge electrode group 22', and the discharge electrode group 22' includes multiple circumferentially arranged discharge beams 21', with the discharge beams 21' in the discharge electrode group 22' being distributed in a circular pattern.

[0096] In this embodiment, the extension 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 this invention, 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 efficiency of particle removal at the downstream end.

[0098] In this invention, tests have shown that, under the same purification efficiency requirements, compared to purifying particulate matter in a gas using a single electrode rod or wire and a metal mesh adsorption unit, the discharge unit of this invention, when combined with the same metal mesh adsorption unit, requires less voltage to be applied than a single electrode rod or wire. This results in 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... Figure 11As shown, the device includes a coarse particle filter 400, a catalytic oxidation device 500, a DPF device 600, and a denitrification device 700 arranged sequentially and fluidly along the gas flow direction. The coarse particle filter 400 uses an electric field to adsorb particulate matter larger than micrometers in the exhaust gas. The exhaust gas after treatment by the coarse particle filter 400 enters the catalytic oxidation device 500, which contains a catalyst to catalytically oxidize one or more substances among nitric oxide, carbon monoxide, and hydrocarbons in the exhaust gas, removing at least a portion of these substances. The exhaust gas after catalytic oxidation in the catalytic oxidation device 500 enters the DPF device 600, which filters out large particles, such as those larger than micrometers. The exhaust gas after large particle filtration in the DPF device 600 enters the denitrification device 700 for denitrification treatment, which can be performed using existing technologies employing urea or ammonia as a reducing agent.

[0101] In this invention, the DPF device 600 is an existing DPF device.

[0102] The catalytic oxidation device 500 in this invention is filled with a catalytic oxidant, which can be referred to as the manganese oxide catalyst provided in Chinese Patent CN116809054A.

[0103] In this invention, the coarse particle filtration device 400 is selected from any one of the gas particulate matter purification devices provided in Examples 1-3. After a period of use, the first multi-layer metal mesh 421 and / or the second multi-layer metal mesh 431 can be removed 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, saving costs.

[0104] Some embodiments of the present invention also provide a method for treating exhaust emissions from internal combustion engines that improves lifespan and reduces costs, comprising the following steps:

[0105] S1: Pre-filter (coarse particle filter)

[0106] S11: The exhaust gas is introduced into the coarse particle filter 400. The coarse particle filter 400 applies an electric field and / or physical adsorption to the exhaust gas entering it. The particulate matter is adsorbed on the first multilayer metal mesh 421 and / or the second multilayer metal mesh 431, thereby removing particles larger than micrometers. 70-80% removal of large particles reduces clogging of the DPF.

[0107] S12: After a period of electric field adsorption treatment, the first multilayer metal mesh 421 and / or the second multilayer metal mesh 431 can be removed and cleaned to achieve regeneration. The cleaned first multilayer metal mesh 421 and / or the second multilayer metal mesh 431 can be reused, saving costs.

[0108] S2: Catalytic oxidation treatment

[0109] The exhaust gas after being adsorbed by the coarse particle filter 400 enters the catalytic oxidation device 500 for catalytic oxidation treatment to remove at least part of one or more of the following substances from the internal combustion engine exhaust gas: nitric oxide, carbon monoxide, and hydrocarbons.

[0110] S3: DPF processing

[0111] After catalytic oxidation treatment, the exhaust gas is passed into a DPF device for particulate matter capture to remove large particles from the exhaust gas.

[0112] S4: Denitrification treatment:

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

[0114] In this embodiment, before the exhaust gas enters the DPF device 600 for particulate matter filtration, it first passes through the coarse particle filter 400 to remove some particles larger than micrometers. With this design, since some micrometer-sized particles are adsorbed by the electric field before physical adsorption, the resistance of the DPF device is reduced, which can reduce back pressure. On the other hand, it can extend the service life, reduce costs, save fuel consumption, and reduce pollutant emissions.

[0115] Throughout this specification, references to "an example," "an embodiment," or "an embodiment" indicate that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment. Therefore, the appearance of "an example," "an embodiment," or "an embodiment" in various places throughout this specification does not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic 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 invention. Any person skilled in the art can 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 those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A gas particulate matter purification device for adsorbing and purifying particulate matter in gas, characterized in that, include: The discharge unit includes at least one discharge beam electrically connected to one electrode of a DC high-voltage power supply; The first metal mesh adsorption unit includes multiple layers of metal mesh stacked together, and the multiple layers of metal mesh 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 between them, or the first metal mesh adsorption unit is located behind the discharge unit and has a distance between them. The discharge beam is positioned on the 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 multilayer 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-metallic rod, which is disposed on the end face of the multi-layer metal mesh facing the discharge unit. The non-metallic rod senses the high voltage of the discharge beam and forms an induced electric field with the multilayer metal mesh.

3. The gas particulate matter purification device according to claim 1 or 2, characterized in that, The gas particulate matter purification device also includes a second metal mesh adsorption unit, which includes multiple layers of metal mesh stacked together. Along the gas flow direction, the first metal mesh adsorption unit is located on one side of the discharge unit, and the second metal mesh adsorption unit is located on the other side of the discharge unit, with 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 multilayer metal mesh of the second metal mesh adsorption unit is electrically connected to one 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 comprises multiple metal wires and / or conductive non-metal 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 0.1 million; (2) The diameter of the metal wire is in the range of 0.1-100 μm; (3) The diameter range of the conductive non-metallic wire is 0.1-100um.

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

8. The gas particulate matter purification device according to claim 6 or 7, 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. Preferably, the single fiber diameter of the stainless steel fiber is in the range of 5-100 μm; Preferably, the diameter of a single carbon fiber filament is in the range of 5-100 μm.

9. 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 group includes multiple circumferentially arranged discharge beams. Preferably, the discharge unit includes a plurality of discharge electrode groups with different radii and coaxially arranged.

10. The gas particulate matter purification device according to claim 9, characterized in that, 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 10-85°.

11. The gas particulate matter purification device according to claim 9, characterized in that, The discharge beams arranged circumferentially in the discharge electrode group are arranged along the axial direction of the discharge electrode group.

12. The gas particulate matter purification device according to any one of claims 1-11, characterized in that, The voltage range of the discharge unit is -3kV to -60kV.

13. The gas particulate matter purification device according to any one of claims 1-12, characterized in that, The discharge beam includes multiple metal wires and / or non-metal wires, with one end of each wire fixed together to form a fixed end and the other end being a free end, which faces the first metal mesh adsorption unit.

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

15. A low-cost, long-life internal combustion engine exhaust emission treatment device, comprising: The DPF device is characterized in that it further includes a coarse particle filter along the gas flow direction, the coarse particle filter being in fluid communication with the DPF device and located before the DPF device, and the coarse particle filter being the gas particulate matter purification device as described in claims 1-14.

16. The internal combustion engine exhaust gas treatment device according to claim 15, characterized in that, It also includes a catalytic oxidation device, which is located between the coarse particle filter and the DPF device, and is in fluid communication with both the coarse particle filter and the DPF device.

17. The internal combustion engine exhaust gas treatment device according to claim 15, characterized in that, It also includes a denitrification device, which performs denitrification treatment on the exhaust gas after it has been treated by the DPF device.

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