A catalyst-free dry non-thermal CO removal device

Abstract

This invention belongs to the field of exhaust gas treatment technology and discloses a catalyst-free, dry, non-thermal CO removal device. The device includes a CO removal unit; the CO removal unit includes a CO removal unit shell, two gas equalization pipes, and several plasma generation units; wherein the two gas equalization pipes are symmetrically arranged and located on the inlet and outlet sides of the CO removal unit shell, respectively; the several plasma generation units are arranged parallel to each other and without contact between the two gas equalization pipes. The catalyst-free, dry, non-thermal CO removal device of this invention can remove CO without the addition of an extra catalyst, has a simple structure, a large number of filamentary discharges, intense discharge, no catalyst required, a long service life, and can meet the needs of large-flow CO-containing waste gas removal and conversion, and is easily scalable.

Description

Technical Field

[0001] This invention relates to the field of exhaust gas treatment technology, and in particular to a catalyst-free, dry, non-thermal CO removal device. Background Technology

[0002] Factory exhaust and mine explosion-proof vehicle exhaust contain large amounts of CO, polluting the environment. CO is a greenhouse gas that participates in atmospheric chemical reactions, accelerating global warming. CO is also a significant component of photochemical smog, exacerbating urban air pollution. Furthermore, CO poses a serious safety hazard, especially in enclosed spaces where elevated concentrations can lead to explosions. Given the harmfulness of CO, taking measures to reduce its emissions and implementing CO-containing exhaust gas elimination and conversion programs is of paramount importance.

[0003] Traditional CO waste gas treatment methods employ catalytic combustion, which involves a centralized collection system to gather carbon monoxide waste gas into the treatment equipment, resulting in a complex system. Water washing purification methods suffer from drawbacks such as bulky flame arrestor designs, difficult cleaning, and high water consumption. Furthermore, the discharge of acidic and alkaline wastewater along with the exhaust gas exacerbates secondary pollution problems. In filtration coupled with catalyst elimination, the CO conversion process is accompanied by side reactions, leading to filter clogging and reduced purification efficiency, as well as limitations such as inconvenient maintenance and short service life. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a catalyst-free, dry, non-thermal CO removal device. This device eliminates CO without the need for an additional catalyst, features a simple structure, numerous and intense filamentary discharges, a long service life, and can meet the needs for eliminating and converting large volumes of CO-containing waste gas. It is also easily scalable.

[0005] The present invention provides a catalyst-free, dry, non-thermal CO removal device through the following technical solution:

[0006] This invention considers non-thermal equilibrium plasma technology, which consists of charged particles and neutral components. Its electron energy exhibits a non-equilibrium distribution, typically ranging from 1 to 20 eV, effectively activating gases, breaking the kinetic limitations of reactions, and allowing chemical reactions to proceed at room temperature, significantly reducing energy consumption. Furthermore, the discharge plasma generation unit has a simple structure, high modularity, good replaceability, and advantages in long lifespan and easy maintenance. Therefore, this invention provides a catalyst-free, dry, non-thermal CO removal device, including a CO removal unit; the CO removal unit includes a CO removal unit shell, two gas equalization tubes, and several plasma generation units.

[0007] In this invention, two gas equalization pipes are symmetrically arranged and located on the inlet and outlet sides of the CO elimination unit housing, respectively; several plasma generation units are arranged parallel to each other and without contact between the two gas equalization pipes. It should be noted that the exhaust gas to be treated first enters the gas equalization pipe located on the inlet side of the CO elimination unit housing and is uniformly divided. The divided exhaust gas then enters several plasma generation units for plasma treatment to eliminate CO from the exhaust gas. The CO-free gas then merges again through the gas equalization pipe located on the outlet side of the CO elimination unit and is discharged together from the outlet side of the CO elimination unit housing.

[0008] It should also be emphasized that, in this invention, each plasma generating unit includes a hollow copper tube and a first metal shell arranged coaxially from the inside to the outside to form a coaxial cylindrical discharge electrode.

[0009] The first metal casing has a cylindrical structure and is arranged parallel to the CO elimination unit casing; the outer surface of the first metal casing is grounded to serve as a grounding electrode.

[0010] The hollow copper tube is used for electrical connection with the output terminal of a high-voltage power supply to serve as the high-voltage side of the discharge. The outer wall of the hollow copper tube's inlet side is sealed to the inner wall of the first metal casing's inlet side. A first insulating sealing block is provided on the outlet side of the hollow copper tube to seal the outlet side. A discharge cavity is formed between the outer wall of the hollow copper tube within the first metal casing and the inner wall of the first metal casing. A barrier dielectric layer is provided within the discharge cavity. A second insulating sealing block is provided at one end of the discharge cavity near the outlet side of the first metal casing. An exhaust channel is formed in the middle of the second insulating sealing block, and the inlet end of the exhaust channel communicates with the discharge cavity. Several small ventilation holes are formed along the length of the hollow copper tube within the first metal casing to allow communication between the interior of the hollow copper tube and the discharge cavity.

[0011] It should be noted that when the exhaust gas to be treated, after being uniformly diverted by the gas equalization pipe on the inlet side, enters the corresponding plasma generation unit, the exhaust gas first enters the hollow structure of the hollow copper tube from the inlet end of the hollow copper tube. The gas inside the hollow structure of the hollow copper tube can be released into the discharge cavity through several small vent holes provided on its tube wall.

[0012] It should also be noted that, compared to solid metal, the hollow structure of the hollow copper tube of this invention not only reduces the weight of the device but also allows for gas passage. Furthermore, the hollow copper tube is made of metallic copper, enabling it to function as a conductive metal. Simultaneously, the hollow copper tube has several small vent holes, allowing gas inside to be evenly ejected through these vent holes and fill the discharge area when a high-frequency voltage is applied, thus functioning as a flow equalization device. In some preferred embodiments of this invention, the high-frequency voltage used is selected from kHz AC sources (frequency 10kHz–30kHz), repetitive microsecond pulse sources (frequency 10kHz–500kHz), and kHz modulated voltages, with voltage amplitudes in the kV range.

[0013] In some preferred embodiments of the present invention, the barrier dielectric layer is formed by filling ceramic microspheres with a particle size of 0.5 mm to 2 mm. These ceramic microspheres have a high dielectric constant and a high secondary electron emission coefficient, which, as a barrier dielectric layer, can effectively equalize gas flow and prolong the gas treatment time in the plasma region. The dielectric layer prevents continuous arc discharge between electrodes, resulting in alternating spark discharges on both sides of the dielectric, forming a series of tiny discharge channels. These discharge channels generate high-energy electrons, ions, and free radicals, which can participate in chemical reactions. The presence of the filler increases the surface area of ​​the discharge region, thereby improving the discharge efficiency per unit volume. The dielectric constant of the filler affects the discharge mode and plasma characteristics; a filler with a high dielectric constant can induce a stronger electric field on its surface, inducing partial discharge. In some more preferred embodiments of the present invention, the barrier dielectric layer is formed by filling zirconia microspheres with a particle size of 0.5 mm to 2 mm.

[0014] In some preferred embodiments of the present invention, the first metal shell is made of copper to enhance the adsorption of gases such as CO and CO2. However, considering that the adsorption effect of copper on gases such as CO and CO2 is not very strong, the present invention sets the inner surface of the first metal shell as a stepped pattern structure. This allows the copper first metal shell to work with the stepped pattern structure on its surface to increase the surface area of ​​the copper first metal shell, slightly increasing the adsorption effect. A good adsorption effect can promote the conversion effect. At the same time, this pattern will bring many points of electric field concentration, enhance partial discharge, thereby enhancing CO adsorption and increasing the intensity of partial discharge, thereby improving the efficiency of CO elimination.

[0015] In some preferred embodiments of the present invention, a first insulating fixing layer is provided on the inner wall of the CO elimination unit housing.

[0016] In some preferred embodiments of the present invention, the first insulating fixing layer is made of a heat-resistant insulating rigid material. The heat-resistant insulating rigid material may be selected from any one of ceramics, polyimide, polytetrafluoroethylene, and phenolic plastics.

[0017] In some preferred embodiments of the present invention, an insulating filler layer is further filled between the two gas equalization tubes, the plasma generation unit and the first insulating fixing layer.

[0018] In some preferred embodiments of the present invention, the insulating filler layer is made of rigid elastic insulating heat-resistant particles. Specifically, the rigid elastic insulating heat-resistant particles are organosilicon particles with a particle size of 2 mm to 5 mm.

[0019] In some preferred embodiments of the present invention, the gas equalization pipe disposed on the inlet side of the CO elimination unit housing has a plurality of outlets at its outlet end to uniformly distribute the input exhaust gas; the gas equalization pipe disposed on the outlet side of the CO elimination unit housing has a plurality of inlets corresponding one-to-one with the plurality of outlets at its inlet end; the inlet side of each plasma generation unit is connected to its corresponding outlet, and the outlet side of each plasma generation unit is connected to its corresponding inlet, so that the plurality of plasma generation units are disposed parallel to each other and without contact between the two gas equalization pipes to perform plasma treatment on the uniformly distributed exhaust gas.

[0020] In some preferred embodiments of the present invention, the catalyst-free dry non-thermal CO removal device further includes a gas pretreatment unit, and the gas pretreatment unit is disposed at the front end of the CO removal unit, such that the gas pretreatment unit and the CO removal unit are arranged sequentially along the gas conveying direction.

[0021] In some preferred embodiments of the present invention, the CO elimination unit and the gas pretreatment unit are coaxially arranged so that the exhaust gas to be treated can be processed in the same flow direction, thereby improving the CO elimination efficiency in the exhaust gas.

[0022] In some preferred embodiments of the present invention, the gas pretreatment unit includes a second metal casing and a plurality of cooling water pipes; the plurality of cooling water pipes are arranged horizontally and sequentially within the second metal casing without contacting each other, and the length direction of the plurality of cooling water pipes is parallel to the gas conveying direction within the second metal casing. In some more preferred embodiments of the present invention, each of the plurality of cooling water pipes is provided with an inlet and an outlet, the inlet being connected to a cooling water source, and the outlet being connected to a water source recovery device, and the conveying direction of the cooling water in the cooling water pipes is parallel to the opposite direction to the gas conveying direction within the second metal casing, so that the cooling water in the plurality of cooling water pipes can fully exchange heat with the input gas in a flowing state.

[0023] In some preferred embodiments of the present invention, each of the cooling water pipes is arranged in a serpentine structure to increase the contact area between the gas and the cooling water pipes and improve the cooling effect.

[0024] In some preferred embodiments of the present invention, each of the cooling water pipes is made of a flexible heat-resistant insulating material. Specifically, the flexible heat-resistant insulating material is a boron nitride-doped organic phase change material.

[0025] In some preferred embodiments of the present invention, a second insulating fixing layer is provided on the inner wall of the second metal shell. The second insulating fixing layer is made of a heat-resistant insulating rigid material, which can be selected from any one of ceramics, polyimide, polytetrafluoroethylene, and phenolic plastics.

[0026] In some preferred embodiments of the present invention, a porous ceramic layer is filled between several cooling water pipes and the second insulating fixing layer. In some more preferred embodiments of the present invention, the porous ceramic layer is a washable, sponge-like sintered microporous ceramic sheet, wherein the micropore diameter is 100 μm to 5000 μm.

[0027] In some preferred embodiments of the present invention, the exhaust channel is coaxially arranged with the hollow copper tube.

[0028] In some preferred embodiments of the present invention, the air inlet end of the hollow copper tube extends outward to the air inlet side of the first metal shell, and the air inlet end of the hollow copper tube is provided with a gas interface, which is connected to the corresponding air outlet.

[0029] In some preferred embodiments of the present invention, the gas interface is pagoda-shaped;

[0030] In some preferred embodiments of the present invention, the gas interface is made of a high-temperature resistant insulating material, which is polytetrafluoroethylene.

[0031] In some preferred embodiments of the present invention, a sealing sleeve is provided between the air inlet side of the hollow copper tube and the air inlet side of the first metal shell, so as to seal the air inlet side of the hollow copper tube and the air inlet side of the first metal shell through the sealing sleeve.

[0032] In some preferred embodiments of the present invention, the sealing sleeve has an annular structure, with its inner wall abutting against the outer wall of the hollow copper tube, and its outer wall near the air intake side of the first metal shell abutting against the inner wall of the first metal shell, so as to seal the air intake side of the first metal shell.

[0033] In some preferred embodiments of the present invention, the sealing sleeve is made of a high-temperature resistant insulating material, which is polytetrafluoroethylene.

[0034] In some preferred embodiments of the present invention, a first gas inlet flange is provided on the gas inlet side of the first metal casing, and a first fixed sealing hole is provided on the first gas inlet flange; a first gas outlet flange is provided on the gas outlet side of the first metal casing, and a second fixed sealing hole is provided on the first gas outlet flange.

[0035] In some preferred embodiments of the present invention, a second gas inlet flange is provided on the gas inlet side of the second metal casing, and a third fixed sealing hole is provided on the second gas inlet flange; a second gas outlet flange is provided on the gas outlet side of the second metal casing, and a fourth fixed sealing hole is provided on the second gas outlet flange.

[0036] In some preferred embodiments of the present invention, both gas equalization pipes are tempered plexiglass pipes, and their interiors are filled with inorganic particles with a diameter of 1 mm to 5 mm to form a porous structure, thereby achieving uniform gas distribution through this porous structure. The inorganic particles are quartz particles.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] The catalyst-free dry non-thermal CO removal device provided by this invention is based on enhanced packed bed dielectric barrier discharge plasma, controlling the discharge mode as filamentary discharge. This, combined with the adsorption and decomposition promotion effect of copper-based materials on CO and the promoting effect of metal surface microstructure on gas discharge decomposition, achieves the desired CO removal effect. Diesel engine exhaust gas enters the gas pretreatment unit through a gas pretreatment module, where solid particles in the exhaust gas are adsorbed and cooled. The gaseous components enter the gas equalization pipe of the CO removal module. The porous ceramic plates of the gas pretreatment module are in close contact with and cooled by the serpentine cooling water pipes of the gas pretreatment module, which contain flowing cooling water. After entering the CO removal unit, the gas is first diverted by the gas equalization pipes to different plasma generation units, which are filamentary discharge plasma generation sections. The discharge gas atmosphere is a mixture of CO and nitrogen oxides, with varying proportions. The initial CO concentration is significantly higher than 1000 ppm, the conversion pressure is ~100 kPa, and the conversion temperature is set to ambient temperature.

[0039] The catalyst-free dry non-thermal CO removal device of the present invention can remove CO without the need for additional catalyst. It has a simple structure, a large number of filament discharges, intense discharge, no catalyst required, long service life, and can meet the needs of large-flow CO-containing waste gas removal and conversion. It is also easy to scale up.

[0040] The catalyst-free dry non-thermal CO elimination device of the present invention enhances CO adsorption and increases the intensity of partial discharge by setting a stepped pattern structure on the inner surface of the first metal shell, thereby enhancing the CO discharge plasma elimination effect.

[0041] The catalyst-free, dry, non-thermal CO removal device of the present invention uses ceramic material particles with appropriate particle size, high relative permittivity, and high secondary electron emission coefficient as a barrier medium. The high permittivity and high secondary electron emission coefficient enhance the discharge, while the barrier medium suppresses the conversion of discharge to arcing, maintaining the discharge in a filamentary discharge mode. This increases surface discharge along the dielectric spheres and filamentary discharge between the dielectric spheres, contributing to improved CO removal efficiency. Furthermore, it increases the residence time of CO in the discharge region / gas-solid interface, further enhancing the removal effect.

[0042] Compared to existing CO removal devices that require catalysts, the catalyst-free dry non-thermal CO removal device of this invention can operate stably under ambient temperature and pressure without relying on costly temperature control equipment. The device offers flexible scalability, separating the gas pretreatment module and the CO removal module. Depending on specific needs, the number of units can be increased or decreased to achieve series or parallel connection between devices, thereby precisely controlling the processing capacity and CO removal efficiency. All components are designed for easy disassembly and installation, significantly simplifying the maintenance process and ensuring efficient operation and long-term stability of the equipment. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the CO elimination unit in this invention.

[0044] Figure 2 This is a schematic diagram of the plasma generation unit in this invention.

[0045] Figure 3 This is a schematic diagram of the pretreatment device in this invention. Detailed Implementation

[0046] The technical solutions in the embodiments of the present invention will be clearly and completely described below.

[0047] Example 1

[0048] This embodiment provides a catalyst-free dry non-thermal CO removal device, including a CO removal unit 1; the CO removal unit 1 includes a CO removal unit shell 101, two gas equalization pipes 102 and several plasma generation units 103.

[0049] In this embodiment, the two gas equalization pipes 102 are symmetrically arranged and located on the inlet and outlet sides of the CO elimination unit housing 101, respectively; a plurality of plasma generation units 103 are arranged in parallel and without contact with each other between the two gas equalization pipes 102. It should be noted that the exhaust gas to be treated first enters the gas equalization pipe 102 located on the inlet side of the CO elimination unit housing 101 and is evenly divided. The divided exhaust gas then enters a plurality of plasma generation units 103 for plasma treatment to eliminate CO in the exhaust gas. The CO-free gas then merges again through the gas equalization pipe 102 located on the outlet side of the CO elimination unit 101 and is discharged together from the outlet side of the CO elimination unit housing 101.

[0050] In this embodiment, each plasma generating unit 103 includes a hollow copper tube 1031 and a first metal shell 1032 arranged coaxially from the inside to the outside to form a coaxial cylindrical discharge electrode. The first metal shell 1032 has a cylindrical structure and is arranged parallel to the CO elimination unit shell 101; the outer surface of the first metal shell 1032 is grounded to serve as a grounding electrode.

[0051] In this embodiment, the hollow copper tube 1031 is used for electrical connection to the output terminal of a high-voltage power supply to serve as the high-voltage discharge side. A discharge cavity 1033 is formed between the outer wall of the hollow copper tube 1031 within the first metal casing 1032 and the inner wall of the first metal casing 1032. Several small ventilation holes 1035 are formed along the length of the tube body within the first metal casing 1032 to allow communication between the interior of the hollow copper tube 1031 and the discharge cavity 1033. Because the hollow structure of the hollow copper tube 1031 of this invention reduces the weight of the device compared to solid metal, it also allows for gas passage. Furthermore, the hollow copper tube 1031 of this invention is made of metallic copper, enabling it to function as a conductive metal. Meanwhile, the hollow copper tube 1031 of the present invention is provided with a plurality of small ventilation holes 1035, so that when the exhaust gas to be treated after being uniformly diverted by the gas equalization pipe 102 on the air inlet side enters the corresponding plasma generation unit 103, the exhaust gas first enters the hollow structure of the hollow copper tube 1031 from the air inlet end of the hollow copper tube 1031. When a high frequency voltage is applied to the hollow copper tube 1031 of the present invention, the gas inside the hollow copper tube 1031 can be uniformly ejected through the small ventilation holes 1035 on the hollow copper tube 1031 and fill the discharge area, thus achieving the function of equalization as an airflow jet device.

[0052] In this embodiment, a barrier dielectric layer 1034 is disposed within the discharge cavity 1033. The barrier dielectric layer 1034 is formed by filling ceramic microspheres with a particle size of 0.5 mm to 2 mm. The zirconia microspheres have a high dielectric constant and a high secondary electron emission coefficient. As a barrier dielectric layer 1034, it can effectively equalize the gas flow and prolong the gas treatment time in the plasma region. The barrier dielectric layer 1034 prevents continuous arc discharge between electrodes, resulting in alternating spark discharges on both sides of the dielectric, forming a series of tiny discharge channels. These discharge channels generate high-energy electrons, ions, and free radicals, and these active species can participate in chemical reactions. The presence of the filler can increase the surface area of ​​the discharge region, thereby improving the discharge efficiency per unit volume. The dielectric constant of the filler affects the discharge mode and plasma characteristics. A filler with a high dielectric constant can induce a stronger electric field on its surface, inducing partial discharge.

[0053] In this embodiment, the outer wall of the air inlet side of the hollow copper tube 1031 is sealed with the inner wall of the air inlet side of the first metal shell 1032, and a first insulating sealing block 2 is provided on the air outlet side of the hollow copper tube 1031 to seal the air outlet side of the hollow copper tube 1031.

[0054] In this embodiment, a second insulating sealing block 3 is provided at one end of the discharge cavity 1033 near the gas outlet side of the first metal shell 1032. An exhaust channel 301 is provided in the middle of the second insulating sealing block 3, and the air inlet end of the exhaust channel 301 is connected to the discharge cavity 1033.

[0055] In a preferred embodiment of the present invention, the high-frequency voltage used is selected from kHz AC source (frequency 10kHz to 30kHz), repetitive microsecond pulse source (frequency 10kHz to 500kHz), and kHz modulated voltage, with voltage amplitude in the kV range.

[0056] In a preferred embodiment of the present invention, the barrier medium layer 1034 is formed by filling zirconia microspheres with a particle size of 0.5 mm to 2 mm.

[0057] In a preferred embodiment of the present invention, the first metal shell 1032 is made of copper to improve the adsorption capacity for gases such as CO and CO2.

[0058] In a preferred embodiment of the present invention, the inner surface of the first metal shell 1032 is configured with a stepped pattern structure, so that the first metal shell 1032 made of copper can increase the surface area of ​​the first metal shell 1032 made of copper in conjunction with the stepped pattern structure on its surface, slightly increasing the adsorption effect. The good adsorption effect can promote the conversion effect. At the same time, this pattern will bring many points of electric field concentration, enhance the partial discharge, thereby enhancing the CO adsorption and increasing the intensity of the partial discharge, thereby improving the efficiency of CO elimination.

[0059] In a preferred embodiment of the present invention, an insulating filler layer 105 is further filled between the two gas equalization pipes 102, the plasma generating unit 103, and the first insulating fixing layer 104. The insulating filler layer 105 is made of rigid elastic insulating heat-resistant particles. The rigid elastic insulating heat-resistant particles are organosilicon particles with a particle size of 2mm to 5mm.

[0060] In a preferred embodiment of the present invention, the gas equalization pipe 102 disposed on the inlet side of the CO elimination unit housing 101 has a plurality of outlets at its outlet end to uniformly distribute the input exhaust gas; the gas equalization pipe 102 disposed on the outlet side of the CO elimination unit housing 101 has a plurality of inlets corresponding one-to-one with the plurality of outlets; the inlet side of each plasma generation unit 103 is connected to its corresponding outlet, and the outlet side of each plasma generation unit 103 is connected to its corresponding inlet, so that the plurality of plasma generation units 103 are disposed in parallel and without contact with each other between the two gas equalization pipes 102 to perform plasma treatment on the uniformly distributed exhaust gas.

[0061] In a preferred embodiment of the present invention, the catalyst-free dry non-thermal CO removal device further includes a gas pretreatment unit 2, and the gas pretreatment unit 2 is disposed at the front end of the CO removal unit 1, so that the gas pretreatment unit 2 and the CO removal unit 1 are arranged sequentially along the gas conveying direction.

[0062] In a preferred embodiment of the present invention, the CO elimination unit 1 and the gas pretreatment unit 2 are coaxially arranged so that the exhaust gas to be treated can be processed along the same flow direction, thereby improving the CO elimination efficiency in the exhaust gas.

[0063] In a preferred embodiment of the present invention, the gas pretreatment unit 2 includes a second metal casing 201 and a plurality of cooling water pipes 202. The plurality of cooling water pipes 202 are arranged horizontally and sequentially within the second metal casing 201 without contacting each other, and the length direction of the plurality of cooling water pipes 202 is parallel to the gas conveying direction within the second metal casing 201. Each of the plurality of cooling water pipes 202 is provided with an inlet and an outlet. The inlet is connected to a cooling water source, and the outlet is connected to a water recovery device. The conveying direction of the cooling water within the cooling water pipes 202 is parallel and opposite to the gas conveying direction within the second metal casing 201, so that the cooling water within the plurality of cooling water pipes 202 can fully exchange heat with the input gas in a flowing state.

[0064] In a preferred embodiment of the present invention, a first insulating fixing layer 104 is provided on the inner wall of the CO elimination unit housing 101, and a second insulating fixing layer 203 is provided on the inner wall of the second metal housing 201. Both the first insulating fixing layer 104 and the second insulating fixing layer 203 are made of heat-resistant, insulating, rigid materials. The heat-resistant, insulating, rigid materials used in both the first insulating fixing layer 104 and the second insulating fixing layer 203 can be selected from any one of ceramics, polyimide, polytetrafluoroethylene, and phenolic plastics.

[0065] In a preferred embodiment of the present invention, each of the cooling water pipes 202 is arranged in a serpentine structure to increase the contact area between the gas and the cooling water pipes 202 and improve the cooling effect.

[0066] In a preferred embodiment of the present invention, each of the cooling water pipes 202 is made of a flexible heat-resistant insulating material. The flexible heat-resistant insulating material is a boron nitride-doped organic phase change material.

[0067] In a preferred embodiment of the present invention, a porous ceramic layer 204 is filled between each of the plurality of cooling water pipes 202 and the second insulating fixing layer 203. In some more preferred embodiments of the present invention, the porous ceramic layer 204 is a washable, sponge-like sintered microporous ceramic sheet, wherein the micropore diameter is 100 μm to 5000 μm.

[0068] In a preferred embodiment of the present invention, the exhaust channel 301 is coaxially arranged with the hollow copper tube 1031.

[0069] In a preferred embodiment of the present invention, the air inlet end of the hollow copper tube 1031 extends outward to the air inlet side of the first metal shell 1032, and the air inlet end of the hollow copper tube 1031 is provided with a gas interface 1036, which is connected to the corresponding air outlet.

[0070] In a preferred embodiment of the present invention, the gas interface 1036 is pagoda-shaped;

[0071] In a preferred embodiment of the present invention, the gas interface 1036 is made of a high-temperature resistant insulating material, which is polytetrafluoroethylene.

[0072] In a preferred embodiment of the present invention, a sealing sleeve 1037 is provided between the air inlet side of the hollow copper tube 1031 and the air inlet side of the first metal shell 1032, so as to seal the air inlet side of the hollow copper tube 1031 and the air inlet side of the first metal shell 1032 through the sealing sleeve 1037.

[0073] In a preferred embodiment of the present invention, the sealing sleeve 1037 has an annular structure, with its inner wall abutting against the outer wall of the hollow copper tube 1031, and its outer wall near the air intake side of the first metal shell 1032 abutting against the inner wall of the first metal shell 1032, so as to seal the air intake side of the first metal shell 1032.

[0074] In a preferred embodiment of the present invention, the sealing sleeve 1037 is made of a high-temperature resistant insulating material, which is polytetrafluoroethylene.

[0075] In a preferred embodiment of the present invention, a first gas inlet flange 106 is provided on the gas inlet side of the first metal housing 1032, and a first fixed sealing hole 107 is provided on the first gas inlet flange 106; a first gas outlet flange 108 is provided on the gas outlet side of the first metal housing 1032, and a second fixed sealing hole 109 is provided on the first gas outlet flange 108.

[0076] In a preferred embodiment of the present invention, a second gas inlet flange 205 is provided on the gas inlet side of the second metal housing 201, and a third fixed sealing hole 206 is provided on the second gas inlet flange 205; a second gas outlet flange 207 is provided on the gas outlet side of the second metal housing 201, and a fourth fixed sealing hole 208 is provided on the second gas outlet flange 207.

[0077] In a preferred embodiment of the present invention, both gas equalization pipes 102 are tempered organic glass pipes 1021, and their interiors are filled with inorganic particles 1022 with a diameter of 1 mm to 5 mm to form a porous structure, thereby achieving uniform gas distribution through the porous structure. The inorganic particles are quartz particles.

[0078] The catalyst-free dry non-thermal CO removal device provided by this invention is based on enhanced packed bed dielectric barrier discharge plasma, controlling the discharge mode as filamentary discharge. It combines the adsorption and decomposition promoting effect of copper-based materials on CO with the promoting effect of metal surface microstructure on gas discharge decomposition to achieve the desired CO removal effect. Diesel engine exhaust gas enters gas pretreatment unit 2 through a gas pretreatment module, where solid particles in the exhaust gas are adsorbed and cooled. The gas phase components enter the gas equalization pipe 102 of the CO removal module. The porous ceramic plates of the gas pretreatment module are in close contact with and cooled by the serpentine cooling water pipe 202 of the gas pretreatment module, which contains flowing cooling water. After entering CO removal unit 1, the gas is first diverted by the gas equalization pipe 102 to different plasma generation units 103. Plasma generation unit 103 is a filamentary discharge plasma generation section. The discharge gas atmosphere is a mixture of CO and nitrogen oxides, with varying proportions. The initial CO concentration is significantly higher than 1000 ppm, the conversion pressure is ~100 kPa, and the conversion temperature is set to ambient temperature.

[0079] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0080] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation", "connection", and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0081] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0082] Obviously, the above embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A catalyst-free, dry, non-thermal CO removal device, characterized in that, The system includes a CO elimination unit (1); the CO elimination unit (1) includes a CO elimination unit housing (101), two gas equalization pipes (102), and several plasma generation units (103); wherein, the two gas equalization pipes (102) are symmetrically arranged and are respectively located on the inlet side and the outlet side of the CO elimination unit housing (101); the several plasma generation units (103) are arranged in parallel and without contact with each other between the two gas equalization pipes (102); Each of the plasma generating units (103) includes a hollow copper tube (1031) and a first metal shell (1032) arranged coaxially from the inside to the outside to form a coaxial cylindrical discharge electrode; The first metal casing (1032) has a cylindrical structure and is arranged parallel to the CO elimination unit casing (101); the outer surface of the first metal casing (1032) is grounded to serve as a grounding electrode; The hollow copper tube (1031) is used to be electrically connected to the output terminal of the high voltage power supply to serve as the high voltage side for discharge; and the outer wall of the air inlet side of the hollow copper tube (1031) is sealed with the inner wall of the air inlet side of the first metal shell (1032), and a first insulating sealing block (2) is provided on the air outlet side of the hollow copper tube (1031). The hollow copper tube (1031) forms a discharge cavity (1033) between the outer wall of the first metal shell (1032) and the inner wall of the first metal shell (1032); a barrier dielectric layer (1034) is provided in the discharge cavity (1033); and a second insulating sealing block (3) is provided at one end of the discharge cavity (1033) near the gas outlet side of the first metal shell (1032), and an exhaust channel (301) is opened in the middle of the second insulating sealing block (3), and the gas inlet end of the exhaust channel (301) is connected to the discharge cavity (1033); The hollow copper tube (1031) located inside the first metal shell (1032) has several small ventilation holes (1035) along its own length direction so that the interior of the hollow copper tube (1031) is connected to the discharge cavity (1033).

2. The catalyst-free dry non-thermal CO removal apparatus as described in claim 1, characterized in that, The barrier medium layer (1034) is formed by filling ceramic particles with a particle size of 0.5 mm to 2 mm.

3. The catalyst-free dry non-thermal CO removal apparatus as described in claim 1, characterized in that, The first metal shell (1032) is made of copper; and the inner surface of the first metal shell (1032) has a stepped pattern structure.

4. The catalyst-free dry non-thermal CO removal apparatus as described in claim 1, characterized in that, A first insulating fixing layer (104) is provided on the inner wall of the CO elimination unit housing (101); An insulating filler layer (105) is also filled between the two gas equalization pipes (102), the plasma generation unit (103), and the first insulating fixing layer (104).

5. The catalyst-free dry non-thermal CO removal apparatus as described in claim 1, characterized in that, The gas equalization pipe (102) located on the air inlet side of the CO elimination unit housing (101) has several air outlets at its outlet end to evenly distribute the input exhaust gas. The gas equalization pipe (102) located on the outlet side of the CO elimination unit housing (101) has a plurality of inlets at its inlet end that correspond one-to-one with the plurality of outlets. Each plasma generating unit (103) has its inlet side connected to its corresponding outlet side, and its outlet side connected to its corresponding inlet side, so that a plurality of plasma generating units (103) are arranged in parallel and without contact with each other between the two gas equalization pipes (102) to perform plasma treatment on the uniformly divided tail gas.

6. The catalyst-free dry non-thermal CO removal apparatus as described in claim 1, characterized in that, The catalyst-free dry non-thermal CO removal device further includes a gas pretreatment unit (2); the gas pretreatment unit (2) is located at the front end of the CO removal unit (1); The gas pretreatment unit (2) includes a second metal casing (201) and several cooling water pipes (202); A plurality of cooling water pipes (202) are arranged horizontally and without contact with each other in the second metal casing (201), and the length direction of the plurality of cooling water pipes (202) is parallel to the gas delivery direction inside the second metal casing (201).

7. The catalyst-free dry non-thermal CO removal apparatus as described in claim 6, characterized in that, Each of the cooling water pipes (202) is arranged in a serpentine pattern.

8. The catalyst-free dry non-thermal CO removal apparatus as described in claim 6, characterized in that, Each of the cooling water pipes (202) is made of flexible, heat-resistant, and insulating material; The flexible heat-resistant insulating material is a boron nitride-doped organic phase change material.

9. The catalyst-free dry non-thermal CO removal apparatus as described in claim 6, characterized in that, A second insulating fixing layer (203) is provided on the inner wall of the second metal shell (201); the material of the second insulating fixing layer (203) is a heat-resistant insulating rigid material.

10. The catalyst-free dry non-thermal CO removal apparatus as described in claim 6, characterized in that, A porous ceramic layer (204) is filled between several of the cooling water pipes (202) and the second insulating fixing layer (203).

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