Device for removing CO through plasma catalysis

Abstract

The utility model belongs to the technical field of tail gas treatment, and discloses a device for removing CO through plasma catalysis. The device comprises a pretreatment unit and an elimination unit which are arranged in sequence, the eliminating unit comprises a stainless steel shell, and a gas flow equalizing and cooling multilayer metal block and a gas flow equalizing metal block which are arranged at the gas inlet end and the gas outlet end of the stainless steel shell; a plurality of corona discharge conversion units are arranged between the gas flow equalizing and cooling multilayer metal blocks in parallel, so that the pretreated tail gas is uniformly shunted and cooled through the gas flow equalizing and cooling multilayer metal blocks, and then CO in the tail gas is eliminated through corona discharge conversion in the corresponding corona discharge conversion units; and under the action of the gas flow-equalizing metal block, the gas flows together and then is discharged together. The device disclosed by the utility model is simple in structure, and can realize corona discharge and violent discharge at normal temperature and normal pressure under the condition of not additionally adding a catalyst, so that the requirement of eliminating CO in large-flow tail gas is met.

Description

Technical Field

[0001] This utility model relates to the field of exhaust gas treatment technology, and in particular to a device for eliminating CO by plasma catalysis. Background Technology

[0002] Industrial exhaust and the emissions from explosion-proof mining vehicles are rich in carbon monoxide (CO), posing a significant threat to the ecological environment. CO, a driver of the greenhouse effect, accelerates global warming; it is also a core component of photochemical smog, exacerbating urban air pollution; furthermore, high concentrations of CO in enclosed environments pose a hidden explosion hazard. Given its severe impacts, reducing emissions and implementing CO conversion are of paramount importance.

[0003] Traditional water-washing purification methods, while aiming to remove exhaust gases, are heavily criticized for their cumbersome flame arrestor design, inconvenient cleaning, high water consumption, and secondary pollution. To address these technical issues, those skilled in the art have proposed introducing a combined DOC (diesel oxidation catalyst) and DPF (diesel particulate filter) device. This combination, using a precious metal coating for reinforcement, attempts to overcome challenges in thermal stability and mechanical strength, ensuring synergistic action with the catalytic components. However, this combined device not only requires additional catalyst but also suffers from DOC clogging during use, leading to a decline in the overall device's CO conversion and removal efficiency, thus limiting its lifespan and making it difficult to meet the CO removal requirements of large-volume exhaust gases. Furthermore, the complex structure and difficult disassembly of this combined device result in high maintenance difficulty, hindering its large-scale application. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a device for plasma catalytic elimination of CO.

[0005] The present invention discloses a plasma catalytic CO removal device through the following technical solution:

[0006] This invention provides a device for plasma catalytic removal of CO, comprising a pretreatment unit, an removal unit, and several corona discharge conversion units.

[0007] In this invention, the pretreatment unit is used to remove impurities from the exhaust gas to be treated, so as to prevent impurities in the exhaust gas from clogging the subsequent elimination unit, thereby improving the service life of the elimination unit.

[0008] In this invention, the elimination unit includes a stainless steel shell, a multi-layered metal block for gas equalization and cooling, and a metal block for gas equalization.

[0009] The stainless steel outer shell has a hollow structure inside, and an air inlet pipe is provided at the air inlet end of the stainless steel outer shell. The air inlet end of the air inlet pipe is connected to the air outlet end of the pretreatment unit to receive the exhaust gas after pretreatment by the pretreatment unit, and allow it to enter the stainless steel outer shell through the air inlet pipe for subsequent CO removal treatment.

[0010] The stainless steel casing is equipped with an exhaust pipe at its outlet end, which is used to discharge the gas after CO removal.

[0011] The gas equalization and cooling multilayer metal block is disposed at the outlet end of the air inlet pipe to uniformly distribute and cool the gas transported through the air inlet pipe. The gas equalization and cooling multilayer metal block is also connected to an external power source as an input electrode.

[0012] The gas equalization metal block is disposed at the gas outlet end of the stainless steel shell, and the gas outlet end of the gas equalization metal block is connected to the gas inlet end of the gas outlet pipe.

[0013] It should also be noted that, in this utility model, several of the aforementioned corona discharge conversion units are arranged sequentially in parallel and without contact with each other between the gas flow equalization and cooling multilayer metal block and the gas flow equalization metal block.

[0014] Each of the aforementioned corona discharge conversion units includes an insulating ceramic hollow tube, a hollow metal needle, and a foamed copper-nickel alloy electrode.

[0015] The insulating ceramic hollow tube is arranged parallel to the gas conveying direction to increase the gas flow rate of the exhaust gas entering the insulating ceramic hollow tube.

[0016] The hollow metal needle is located inside the insulating ceramic hollow tube and is coaxially arranged with the insulating ceramic hollow tube; the tip of the hollow metal needle points to the gas outlet end of the insulating ceramic hollow tube, and the tail of the hollow metal needle is connected to the gas outlet end of the gas equalization and cooling multilayer metal block; the foamed copper-nickel alloy electrode is arranged at the gas outlet end of the insulating ceramic hollow tube, and the gas outlet end of the foamed copper-nickel alloy electrode is connected to the gas inlet end of the gas equalization metal block. With the above configuration, the gas, which has been uniformly diverted and cooled by the gas equalization and cooling multilayer metal block, can be transported from the tail of the hollow metal needle to the tip of the hollow metal needle, and then ejected from the tip of the hollow metal needle, forming a gas column between the tip and the foamed copper-nickel alloy electrode. Since the hollow metal needle is made of conductive metal, the voltage applied by the external voltage can be transmitted to the hollow metal needle through the gas equalization and cooling multilayer metal block, thereby forming a corona discharge region between the tip of the hollow metal needle and the foamed copper-nickel alloy electrode. This results in the generation of high-density active particles in the gas column formed between the tip and the foamed copper-nickel alloy electrode, thereby achieving efficient elimination of CO in the gas column through the generated high-density active particles.

[0017] It should also be emphasized that those skilled in the art should know that the foamed copper-nickel alloy electrode possesses the porous structure characteristics of a typical foamed metal electrode. This allows the gas, after being uniformly distributed and cooled by the multi-layered metal block, to form a gas column between the needle tip and the foamed copper-nickel alloy electrode. Simultaneously, a portion of this gas forms tiny gas columns within the porous structure of the foamed copper-nickel alloy electrode, creating numerous micron-sized localized corona discharge regions. Furthermore, the irregular pore structure of the foamed copper-nickel alloy electrode results in numerous electric field concentration points with localized field strengths reaching 10⁻⁶. 5 V / m~10 6 The V / m ratio facilitates the generation of corona discharge over a large area and at high power. Furthermore, the copper and nickel in the foamed copper-nickel alloy electrode exhibit a certain adsorption capacity for CO. Combined with plasma discharge, this promotes the decomposition and transformation of CO. The microporous structure and stepped surface microstructure increase the gas-solid interface area, expand the catalytic area, and enhance the catalytic effect. In the discharge region, a large number of gas molecules are activated, generating electronically excited states and molecular ions. The lifetimes of these substances are mostly on the millimeter scale. Some active particles that do not undergo transformation in the discharge region will enter the foamed copper-nickel alloy electrode region with the gas flow and undergo a second adsorption and transformation on the metal surface.

[0018] In a preferred embodiment of this invention, the external power supply is a high-frequency voltage power supply, wherein the high-frequency voltage is a kHz AC source, a repetitive microsecond pulse source, or a kHz modulated voltage with a voltage amplitude in the kV range. The frequency of the kHz AC source is 10kHz to 30kHz. The frequency of the repetitive microsecond pulse source is 10kHz to 500kHz.

[0019] In a preferred embodiment of this utility model, the gas flow equalization and cooling multilayer metal block is composed of several first metal plates, which are arranged in parallel with each other, and each first metal plate abuts against the first metal plates on both sides; and the height of the several first metal plates increases along the gas conveying direction, thereby realizing the gradual and uniform distribution and diversion of the exhaust gas.

[0020] Each of the first metal plates has several cooling water delivery channels inside, which extend along the height of the first metal plate. Each of the first metal plates has several first gas through-holes in its center, forming several first gas channels. Each first gas channel corresponds to one of the hollow metal needles, communicating with the tail of the corresponding hollow metal needle. The first gas channels are arranged parallel to the gas delivery direction, and the cooling water delivery channels are arranged perpendicular to the gas delivery direction. The first metal plate also has electrical terminals for connecting to an external power source. Through the above-described configuration, the exhaust gas output from the intake pipe first enters the first gas passage on the first metal plate closest to the intake end of the stainless steel shell and then exits through the first gas passage on the first metal plate furthest from the intake end of the stainless steel shell. During operation, a water supply pipe is connected to the inlet of each cooling water supply channel to supply cooling water, thereby enabling the exhaust gas to fully exchange heat with the cooling water in the cooling water supply channel, thus achieving sufficient cooling of the exhaust gas. This allows the exhaust gas to be evenly distributed and cooled before entering the hollow metal needle.

[0021] Considering that the diameter of the cooling water delivery channel affects the liquid flow rate, in a preferred embodiment of this invention, the diameter of the cooling water delivery channel is 2.5mm to 3.5mm to ensure a larger flow rate while avoiding excessive water pressure in the cooling water delivery channel.

[0022] Considering that a metal plate that is too thick would be too heavy, but must be larger than the diameter of the water pipe, in a preferred embodiment of this invention, the thickness of the first metal plate is 4.5mm to 5.5mm.

[0023] In a preferred embodiment of the present invention, the diameter of the electrical terminal is 0.8mm to 1.2mm.

[0024] In a preferred embodiment of this invention, the gas equalization metal block is composed of several second metal plates arranged in parallel, with each second metal plate abutting against its adjacent second metal plates on both sides. The height of the several second metal plates decreases along the gas delivery direction. Each second metal plate has a second gas through-hole, forming several second gas channels. Each second gas channel corresponds to one of the several insulating ceramic hollow tubes, communicating with the outlet end of the corresponding insulating ceramic hollow tube. The direction of the second gas channels is parallel to the gas delivery direction. Through this arrangement, the exhaust gas output from the insulating ceramic hollow tube first enters the second gas through-hole on the second metal plate closest to the outlet end of the insulating ceramic hollow tube and then exits through the second gas through-hole on the second metal plate furthest from the outlet end of the insulating ceramic hollow tube. This achieves the merging of exhaust gases processed by different corona discharge conversion units before output from the outlet end of the stainless steel shell.

[0025] In a preferred embodiment of the present invention, the pretreatment unit includes a pretreatment unit housing and a microporous ceramic block disposed within the pretreatment unit housing.

[0026] In a preferred embodiment of this utility model, an insulating fixing layer is further provided on the inner wall of the stainless steel shell; and the insulating fixing layer is fixedly connected to the edge of the gas flow equalization and cooling multilayer metal block and the gas flow equalization metal block.

[0027] In a preferred embodiment of this utility model, the inner diameter of the insulating ceramic hollow tube is 30mm to 50mm, the outer diameter is 40mm to 60mm, and the length is 100mm to 200mm.

[0028] In a preferred embodiment of this utility model, the hollow metal needle is a hollow copper needle; the length of the hollow copper needle is 30mm to 50mm, the diameter at the tail of the hollow copper needle is 3mm to 6mm, and the diameter at the tip of the needle is 1mm to 2mm.

[0029] In a preferred embodiment of the present invention, the foamed copper-nickel alloy electrode has a cylindrical structure with a diameter of 30mm to 50mm and a length of 20mm to 30mm; and the pore size of the foamed copper-nickel alloy electrode is 1μm to 100μm.

[0030] In a preferred embodiment of this utility model, the pretreatment unit is connected to the intake pipe via an intake flange, and the intake flange is provided with a first fixed sealing hole; the intake flange, the first fixed sealing hole and the exhaust turbine port are tightly connected to ensure airtightness and prevent CO leakage.

[0031] In a preferred embodiment of this utility model, the outlet end of the air outlet pipe is provided with an outlet flange, and the outlet flange is provided with a second fixed sealing hole; the outlet flange and the second fixed sealing hole are tightly connected to the exhaust turbine port.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] This invention relates to a plasma catalytic CO removal device, comprising a pretreatment unit, an elimination unit, and several corona discharge conversion units. The pretreatment unit is positioned at the front end of the elimination unit to remove impurities from the exhaust gas, preventing clogging of the subsequent elimination units. The elimination unit comprises a stainless steel shell, and gas equalization and cooling multilayer metal blocks and a gas equalization metal block respectively disposed at the inlet and outlet ends of the stainless steel shell. Several corona discharge conversion units are arranged in parallel between the gas equalization and cooling multilayer metal blocks and the gas equalization metal block, allowing the exhaust gas, after pretreatment by the pretreatment unit, to be uniformly diverted and cooled by the gas equalization and cooling multilayer metal blocks. The diverted exhaust gas then enters the corresponding corona discharge conversion unit, where corona discharge conversion removes CO from the exhaust gas. The CO-removed gases from the different corona discharge conversion units then recombine under the action of the gas equalization metal blocks and are discharged together, thus achieving CO removal from the exhaust gas.

[0034] Each corona discharge conversion unit in this invention includes an insulating ceramic hollow tube, a hollow metal needle, and a foamed copper-nickel alloy electrode. The insulating ceramic hollow tube is arranged parallel to the gas delivery direction to increase the gas flow rate entering the tube. The hollow metal needle is located inside the insulating ceramic hollow tube and is coaxially arranged with it; the tip of the needle points to the outlet end of the insulating ceramic hollow tube, and the tail of the needle communicates with the outlet end of the gas equalization and cooling multilayer metal block. The foamed copper-nickel alloy electrode is located at the outlet end of the insulating ceramic hollow tube, and its outlet end communicates with the inlet end of the gas equalization metal block. With the above configuration, the gas, which has been uniformly diverted and cooled by the gas equalization and cooling multilayer metal block, can be transported from the tail of the hollow metal needle to the tip of the hollow metal needle, and then ejected from the tip of the hollow metal needle, forming a gas column between the tip and the foamed copper-nickel alloy electrode. Since the hollow metal needle is made of conductive metal, the voltage applied by the external voltage can be transmitted to the hollow metal needle through the gas equalization and cooling multilayer metal block, thereby forming a corona discharge region between the tip of the hollow metal needle and the foamed copper-nickel alloy electrode. This results in the generation of high-density active particles in the gas column formed between the tip and the foamed copper-nickel alloy electrode, thereby achieving efficient elimination of CO in the gas column through the generated high-density active particles.

[0035] The copper-nickel alloy foam electrode used in this invention possesses the porous structure characteristics of a typical foam metal electrode. This allows the gas, after being uniformly distributed and cooled by the multi-layered metal block, to form a gas column between the needle tip and the copper-nickel alloy foam electrode. Simultaneously, a portion of the gas forms tiny gas columns within the porous structure of the copper-nickel alloy foam electrode, creating numerous micron-sized corona discharge localized regions. Furthermore, the irregular pore structure of the copper-nickel alloy foam electrode results in numerous electric field concentration points with localized field strengths reaching 10⁻⁶. 5 V / m~10 6 The V / m ratio facilitates the generation of corona discharge over a large area and at high power. Furthermore, the copper and nickel in the foamed copper-nickel alloy electrode exhibit a certain adsorption capacity for CO. Combined with plasma discharge, this promotes the decomposition and transformation of CO. The microporous structure and stepped surface microstructure increase the gas-solid interface area, expand the catalytic area, and enhance the catalytic effect. In the discharge region, a large number of gas molecules are activated, generating electronically excited states and molecular ions. The lifetimes of these substances are mostly on the millimeter scale. Some active particles that do not undergo transformation in the discharge region will enter the foamed copper-nickel alloy electrode region with the gas flow and undergo a second adsorption and transformation on the metal surface.

[0036] The device of this invention has a simple structure and can achieve vigorous corona discharge at room temperature and pressure without the need for additional catalysts, thereby meeting the CO removal requirements of large-flow exhaust gases. Furthermore, the number of corona discharge conversion units can be increased or decreased according to actual requirements, making it easy to disassemble, maintain, and maintain. It has a long service life, does not require expensive temperature control equipment, and is easily scalable. Attached Figure Description

[0037] Figure 1 This is a schematic diagram of the plasma catalytic CO removal device of this invention.

[0038] Figure 2 This is a schematic diagram of the structure of the first metal plate in this utility model.

[0039] Figure 3 This is a schematic diagram of the structure of the second metal plate in this utility model.

[0040] The attached figures are labeled as follows:

[0041] 1-Pretreatment unit; 101-Pretreatment unit housing; 102-Micron-pore ceramic block; 2-Pretreatment unit; 201-Stainless steel shell; 202-Gas flow equalization and cooling multilayer metal block; 2021-First metal plate; 2022-Cooling water delivery channel; 2023-First gas through hole; 203-Gas flow equalization metal block; 2031-Second metal plate; 2032-Second gas through hole; 204-Insulating fixing layer; 3-Corona discharge conversion unit; 301-Insulating ceramic hollow tube; 302-Hollow metal needle; 303-Foamed copper-nickel alloy electrode; 4-Inlet pipe; 5-Outlet pipe; 6-Electrical terminal; 7-Inlet flange; 701-First fixing sealing hole; 8-Outlet flange; 801-Second fixing sealing hole. Detailed Implementation

[0042] The technical solutions in the embodiments of this utility model will be clearly and completely described below.

[0043] Example 1

[0044] Please see Figure 1 This embodiment provides a plasma catalytic CO removal device, including a pretreatment unit 1, an elimination unit 2, and several corona discharge conversion units 3 arranged sequentially along the exhaust gas conveying direction.

[0045] Please see Figure 1In this embodiment, the pretreatment unit 1 includes a pretreatment unit housing 101 and a microporous ceramic block 102 disposed within the pretreatment unit housing 101, so that impurities in the exhaust gas entering through the air inlet of the pretreatment unit 1 are removed by the microporous ceramic block 102 within the pretreatment unit housing 101, thereby achieving impurity removal from the exhaust gas to be treated, thus preventing impurities in the exhaust gas to be treated from clogging the subsequent elimination unit 2, thereby improving the service life of the elimination unit 2.

[0046] Please see Figure 1 In this embodiment, the elimination unit 2 includes a stainless steel shell 201, a gas flow equalization and cooling multilayer metal block 202, and a gas flow equalization metal block 203.

[0047] In this embodiment, several corona discharge conversion units 3 are arranged in parallel and without contact between the gas flow equalization and cooling multilayer metal block 202 and the gas flow equalization metal block 203, and each corona discharge conversion unit 3 includes an insulating ceramic hollow tube 301, a hollow metal needle 302 and a foamed copper-nickel alloy electrode 303.

[0048] In this embodiment, the stainless steel outer shell 201 has a hollow structure inside. The air inlet end of the stainless steel outer shell 201 is provided with an air inlet pipe 4. The air inlet end of the air inlet pipe 4 is connected to the air outlet end of the pretreatment unit 1 to receive the exhaust gas after pretreatment by the pretreatment unit 1, and let it enter the stainless steel outer shell 201 through the air inlet pipe 4 for subsequent CO elimination treatment.

[0049] Please see Figure 2 In this embodiment, the gas flow equalization and cooling multilayer metal block 202 is composed of several first metal plates 2021, which are arranged in parallel. Each first metal plate 2021 abuts against the first metal plates 2021 on both sides. The height of the several first metal plates 2021 increases along the gas conveying direction, thereby realizing the gradual and uniform distribution and diversion of the exhaust gas.

[0050] Each of the first metal plates 2021 includes a first metal plate 2021; the first metal plate 2021 has a plurality of cooling water conveying channels 2022 inside, and the plurality of cooling water conveying channels 2022 are arranged through the height direction of the first metal plate 2021; the first metal plate 2021 has a plurality of first gas through holes 2023 in the middle, and the plurality of gas through holes on the plurality of first metal plates 2021 form a plurality of first gas channels; the plurality of first gas channels correspond one-to-one with the plurality of hollow metal needles 302, and are used to communicate with the needle tail of the corresponding hollow metal needle 302.

[0051] The first gas channel is arranged parallel to the gas delivery direction, and the cooling water delivery channel 2022 is arranged perpendicular to the gas delivery direction.

[0052] Please see Figure 2 The first metal plate 2021 is also provided with a power terminal 6, which is used to connect to an external power source as an input electrode.

[0053] In this embodiment, the exhaust gas output from the intake pipe 4 first enters the first gas passage 2023 on the first metal plate 2021 closest to the intake end of the stainless steel shell 201 and enters the first gas channel. Then, it is discharged from the first gas passage 2023 on the first metal plate 2021 furthest from the intake end of the stainless steel shell 201. During operation, a water supply pipe is connected to the inlet of each cooling water supply channel 2022 to supply cooling water. This allows the exhaust gas to fully exchange heat with the cooling water in the cooling water supply channel 2022, thereby fully cooling the exhaust gas. This achieves uniform diversion and cooling of the exhaust gas before it enters the hollow metal needle 302.

[0054] In this embodiment, the outlet end of the stainless steel shell 201 is provided with an outlet pipe 5, which is used to discharge the gas after CO elimination. The gas equalization metal block 203 is disposed at the outlet end of the stainless steel shell 201, and the outlet end of the gas equalization metal block 203 is connected to the inlet end of the outlet pipe 5.

[0055] In this embodiment, the insulating ceramic hollow tube 301 is arranged parallel to the gas conveying direction in order to increase the gas flow rate of the exhaust gas entering the insulating ceramic hollow tube 301.

[0056] The hollow metal needle 302 is located inside the insulating ceramic hollow tube 301 and is coaxially arranged with the insulating ceramic hollow tube 301; the tip of the hollow metal needle 302 points to the gas outlet end of the insulating ceramic hollow tube 301, and the tail of the hollow metal needle 302 is connected to the gas outlet end of the gas equalization and cooling multilayer metal block 202; the foamed copper-nickel alloy electrode 303 is disposed at the gas outlet end of the insulating ceramic hollow tube 301, and the gas outlet end of the foamed copper-nickel alloy electrode 303 is connected to the gas inlet end of the gas equalization metal block 203. With the above configuration, the gas, which has been uniformly diverted and cooled by the gas equalization and cooling multilayer metal block 202, can be transported from the tail of the hollow metal needle 302 to the tip of the hollow metal needle 302, and then ejected from the tip of the hollow metal needle 302, forming a gas column between the tip and the foamed copper-nickel alloy electrode 303. Since the hollow metal needle 302 is a hollow metal needle made of conductive metal, when an external voltage is applied, the voltage can be transmitted to the hollow metal needle 302 through the gas equalization and cooling multilayer metal block 202, thereby forming a corona discharge region between the tip of the hollow metal needle 302 and the foamed copper-nickel alloy electrode 303. This results in the generation of high-density active particles in the gas column formed between the tip and the foamed copper-nickel alloy electrode 303, thereby achieving efficient elimination of CO in the gas column through the generated high-density active particles.

[0057] The foamed copper-nickel alloy electrode 303 used in this invention possesses the porous structure characteristics of a typical foamed metal electrode. This allows the gas, after being uniformly diverted and cooled by the multi-layered metal block 202, to form a gas column between the needle tip and the foamed copper-nickel alloy electrode 303. Simultaneously, a portion of this gas forms tiny gas columns within the porous structure of the foamed copper-nickel alloy electrode 303, creating numerous micron-sized corona discharge local regions. Furthermore, the irregular pore structure of the foamed copper-nickel alloy electrode 303 results in numerous electric field concentration points with localized field strengths reaching 10. 5～6 The V / m ratio facilitates the generation of corona discharge over a large area with high power. Furthermore, the copper and nickel in the foamed copper-nickel alloy electrode 303 exhibit a certain adsorption capacity for CO. Combined with plasma discharge, this promotes the decomposition and conversion of CO. The microporous structure and stepped surface microstructure are beneficial for increasing the gas-solid interface area, expanding the catalytic area, and enhancing the catalytic effect. In the discharge region, a large number of gas molecules are activated, generating electronically excited states and molecular ions. The lifetime of these substances is mostly on the millimeter scale. Some active particles that do not undergo conversion in the discharge region will enter the foamed copper-nickel alloy electrode 303 region with the airflow and undergo a second adsorption and conversion on the metal surface.

[0058] In a preferred embodiment of this utility model, the external power supply is a high-frequency voltage power supply, wherein the high-frequency voltage is a kHz AC source (frequency 10kHz~30kHz), a repetitive microsecond pulse source (frequency 10kHz~500kHz), or a kHz modulated voltage, with a voltage amplitude in the kV range.

[0059] In a preferred embodiment of the present invention, the thickness of the first metal plate 2021 is 4.5mm to 5.5mm, the diameter of the cooling water conveying channel 2022 is 2.5mm to 3.5mm, and the diameter of the electrical terminal 6 is 0.8mm to 1.2mm.

[0060] Please see Figure 3 In a preferred embodiment of this utility model, the gas equalization metal block 203 is composed of a plurality of second metal plates 2031, which are arranged in parallel and abut against each other with the adjacent second metal plates 2031 on both sides; and the height of the plurality of second metal plates 2031 decreases along the gas conveying direction; each second metal plate 2031 includes a second metal plate 2031; a second gas through hole 2032 is opened inside the second metal plate 2031, and the plurality of second gas through holes 2032 on the plurality of second metal plates 2031 form a plurality of second gas channels; the plurality of second gas channels correspond one-to-one with the plurality of insulating ceramic hollow tubes 301, and are used to communicate with the gas outlet end of the corresponding insulating ceramic hollow tube 301; and the arrangement direction of the second gas channels is parallel to the gas conveying direction. In this embodiment, the exhaust gas output from the insulating ceramic hollow tube 301 first enters the second gas passage 2032 on the second metal plate 2031 closest to the outlet end of the insulating ceramic hollow tube 301 and enters the second gas channel. Then, it is discharged from the second gas passage 2032 on the second metal plate 2031 furthest from the outlet end of the insulating ceramic hollow tube 301. This achieves the merging of exhaust gases processed by different corona discharge conversion units 3 and output from the outlet end of the stainless steel shell 201.

[0061] In a preferred embodiment of the present invention, an insulating fixing layer 204 is further provided on the inner wall of the stainless steel outer shell 201; and the insulating fixing layer 204 is fixedly connected to the edges of the gas flow equalization and cooling multilayer metal block 202 and the gas flow equalization metal block 203.

[0062] In a preferred embodiment of this utility model, the inner diameter of the insulating ceramic hollow tube 301 is 30mm to 50mm, the outer diameter is 40mm to 60mm, and the length is 100mm to 200mm.

[0063] In a preferred embodiment of this utility model, the hollow metal needle 302 is a hollow copper needle; the length of the hollow copper needle is 30mm to 50mm, the diameter at the tail of the hollow copper needle is 3mm to 6mm, and the diameter at the tip of the needle is 1mm to 2mm.

[0064] In a preferred embodiment of the present invention, the foamed copper-nickel alloy electrode 303 has a cylindrical structure with a diameter of 30mm to 50mm and a length of 20mm to 30mm; and the pore size of the foamed copper-nickel alloy electrode 303 is 1μm to 100μm.

[0065] In a preferred embodiment of the present invention, the pretreatment unit 1 is connected to the intake pipe 4 via an intake flange 7, and the intake flange 7 is provided with a first fixed sealing hole 701; the intake flange 7 and the first fixed sealing hole 701 are tightly connected to the exhaust turbine port.

[0066] In a preferred embodiment of the present invention, the outlet end of the outlet pipe 5 is provided with an outlet flange 8, and the outlet flange 8 is provided with a second fixed sealing hole 801; the outlet flange 8 and the second fixed sealing hole 801 are tightly connected to the exhaust turbine port.

[0067] Obviously, the above embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

Claims

1. A device for catalytic elimination of CO by plasma, characterized in that, It comprises a pretreatment unit (1), an elimination unit (2) and a plurality of corona discharge conversion units (3); The pretreatment unit (1) is used for removing impurities from the gas to be treated; The elimination unit (2) comprises a stainless steel shell (201), a gas flow equalization and cooling multi-layer metal block (202) and a gas flow equalization metal block (203); the stainless steel shell (201) has a hollow structure inside, the gas inlet end of the stainless steel shell (201) is provided with a gas inlet pipeline (4), the gas inlet end of the gas inlet pipeline (4) is communicated with the gas outlet end of the pretreatment unit (1); the gas outlet end of the stainless steel shell (201) is provided with a gas outlet pipeline (5); The gas flow equalization and cooling multi-layer metal block (202) is arranged at the gas outlet end of the gas inlet pipeline (4) and is used for uniformly distributing and cooling the gas conveyed through the gas inlet pipeline (4); and the gas flow equalization and cooling multi-layer metal block (202) is further connected with an external power supply to serve as an input electrode; The gas flow equalization metal block (203) is arranged at the gas outlet end of the stainless steel shell (201), and the gas outlet end of the gas flow equalization metal block (203) is communicated with the gas inlet end of the gas outlet pipeline (5); A plurality of the corona discharge conversion units (3) are arranged in parallel and not in contact between the gas flow equalization and cooling multi-layer metal block (202) and the gas flow equalization metal block (203); Each of the corona discharge conversion units (3) comprises an insulating ceramic hollow tube (301), a hollow metal needle (302) and a foamed copper-nickel alloy electrode (303); wherein the insulating ceramic hollow tube (301) is arranged in parallel with the gas conveying direction; the hollow metal needle (302) is located in the insulating ceramic hollow tube (301) and is coaxially arranged with the insulating ceramic hollow tube (301); the needle tip of the hollow metal needle (302) points to the gas outlet end of the insulating ceramic hollow tube (301), and the needle tail of the hollow metal needle (302) is communicated with the gas outlet end of the gas flow equalization and cooling multi-layer metal block (202); the foamed copper-nickel alloy electrode (303) is arranged at the gas outlet end of the insulating ceramic hollow tube (301), and the gas outlet end of the foamed copper-nickel alloy electrode (303) is communicated with the gas inlet end of the gas flow equalization metal block (203).

2. The apparatus for catalytic elimination of CO by plasma as claimed in claim 1, wherein, The gas flow equalization and cooling multi-layer metal block (202) is composed of a plurality of first metal plates (2021), a plurality of the first metal plates (2021) are arranged in parallel, each first metal plate (2021) is abutted with the first metal plates (2021) adjacent to it on both sides; and the height of a plurality of the first metal plates (2021) in the gas conveying direction increases. Each of the first metal plates (2021) is internally provided with a plurality of cooling water conveying channels (2022), the plurality of cooling water conveying channels (2022) are arranged in the height direction of the first metal plate (2021); and the middle part of each of the first metal plates (2021) is provided with a plurality of first gas through holes (2023), the plurality of first gas through holes (2023) on the plurality of first metal plates (2021) form a plurality of first gas channels; the plurality of first gas channels correspond to the plurality of hollow metal needles (302) one by one, and are used for communicating with the needle tail of the corresponding hollow metal needle (302); The arrangement direction of the first gas channel is parallel to the gas conveying direction, and the arrangement direction of the cooling water conveying channel (2022) is perpendicular to the gas conveying direction; The first metal plate (2021) is further provided with an electricity connection terminal (6), and the electricity connection terminal (6) is used for connecting with an external power supply.

3. The apparatus for catalytic elimination of CO by plasma as claimed in claim 2, wherein, The thickness of the first metal plate (2021) is 4.5mm-5.5mm; The diameter of the cooling water conveying channel (2022) is 2.5mm-3.5mm; The diameter of the electricity connection terminal (6) is 0.8mm-1.2mm.

4. The apparatus for catalytic elimination of CO by plasma as claimed in claim 1, wherein, The gas flow uniformizing metal block (203) is composed of a plurality of second metal plates (2031), the plurality of second metal plates (2031) are arranged in parallel, each of the second metal plates (2031) abuts against the second metal plates (2031) adjacent to the two sides thereof, and the plurality of second metal plates (2031) decrease in height along the gas conveying direction; Each of the second metal plates (2031) is provided with a second gas through hole (2032), and the plurality of second gas through holes (2032) on the plurality of second metal plates (2031) form a plurality of second gas channels; the plurality of second gas channels correspond to the plurality of insulating ceramic hollow tubes (301) one by one, and are used for communicating with the gas outlet end of the corresponding insulating ceramic hollow tube (301); The arrangement direction of the second gas channel is parallel to the gas conveying direction.

5. The apparatus for catalytic elimination of CO by plasma as claimed in claim 1, wherein, The pretreatment unit (1) comprises a pretreatment unit shell (101) and a microporous ceramic block (102) arranged in the pretreatment unit shell (101).

6. The apparatus for catalytic elimination of CO by plasma as claimed in claim 1, wherein, An insulating fixing layer (204) is further arranged on the inner wall of the stainless steel shell (201), and the insulating fixing layer (204) is fixedly connected with the edges of the gas flow uniformizing and cooling multilayer metal block (202) and the gas flow uniformizing metal block (203).

7. The apparatus for catalytic elimination of CO by plasma as claimed in claim 1, wherein, The inner diameter of the insulating ceramic hollow tube (301) is 30mm-50mm, the outer diameter is 40mm-60mm, and the length is 100mm-200mm.

8. The apparatus for catalytic elimination of CO by plasma as claimed in claim 1, wherein, The hollow metal needle (302) is a hollow copper needle, the length of the hollow copper needle is 30mm-50mm, the diameter of the needle tail of the hollow copper needle is 3mm-6mm, and the diameter of the needle tip is 1mm-2mm.

9. The apparatus for catalytic elimination of CO by plasma as claimed in claim 1, wherein, The foam copper-nickel alloy electrode (303) is in a cylindrical structure, the diameter of the cylindrical structure is 30mm-50mm, the length is 20mm-30mm, and the pore size in the foam copper-nickel alloy electrode (303) is 1um-100um.

10. The apparatus for catalytic elimination of CO by plasma as claimed in claim 1, wherein, The pre-treatment unit (1) is connected with the air inlet pipeline (4) through an air inlet flange (7), and the air inlet flange (7) is provided with a first fixed sealing hole (701); An air outlet flange (8) is arranged at the air outlet end of the air outlet pipeline (5), and the air outlet flange (8) is provided with a second fixed sealing hole (801).

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