Catalyst-free dry non-thermal CO elimination device

Abstract

The invention belongs to the technical field of tail gas treatment, and discloses a catalyst-free dry non-thermal CO elimination device. The device comprises a CO elimination unit; the CO eliminating unit comprises a CO eliminating unit shell, two gas flow equalizing pipes and a plurality of plasma generating units; the two gas flow equalizing pipes are symmetrically arranged and located on the gas inlet side and the gas outlet side of the CO elimination unit shell respectively. And the plurality of plasma generation units are arranged between the two gas flow equalizing pipes in parallel and in a mutual non-contact manner. According to the catalyst-free dry type non-thermal CO elimination device, CO can be eliminated without additionally adding a catalyst, the structure is simple, the filamentous discharge number is large, discharge is violent, no catalyst is used, the service life is long, the requirement for elimination and conversion of large-flow CO-containing waste gas can be met, and large-scale production is easy to achieve.

Description

Technical Field

[0001] The invention relates to the technical field of tail gas treatment, and in particular to a catalyst-free dry non-thermal CO elimination device. Background Art

[0002] Factory exhaust and mining explosion-proof vehicle exhaust contain a large amount of CO, which pollutes the environment. CO is one of the greenhouse gases, participates in atmospheric chemical reactions, and accelerates global warming. CO is an important component of photochemical smog, exacerbating urban air pollution. CO is also a serious safety hazard, especially in confined spaces, where increased concentrations may lead to explosions. In view of the harmfulness of CO, it is particularly important to take measures to reduce its emissions and implement elimination and transformation of CO-containing exhaust.

[0003] The traditional method of treating CO waste gas adopts catalytic combustion method, which collects carbon monoxide waste gas to the treatment equipment through a centralized collection system, and the system is complex; the water washing purification method has defects such as bulky fire barrier design, difficult cleaning, and high water consumption. The discharge of acid and alkaline wastewater with tail gas will also aggravate the secondary pollution problem; in the filtration method coupled with catalyst elimination means, the CO conversion process is accompanied by side reactions, which leads to clogging of filter particles and reduced purification efficiency. There are limitations such as inconvenient maintenance and short service life. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a catalyst-free dry non-thermal CO elimination device. The catalyst-free dry non-thermal CO elimination device of the present invention can eliminate CO without adding an additional catalyst, and has a simple structure, a large number of filamentary discharges, intense discharge, no catalyst, long service life, can meet the elimination and conversion needs of large-flow CO-containing waste gas, and is easy to scale.

[0005] The catalyst-free dry non-thermal CO removal device of the present invention is realized by the following technical scheme:

[0006] The present invention takes into account the non-thermal equilibrium plasma technology, which is composed of charged particles and neutral components, and its electron energy presents a non-equilibrium distribution, usually ranging from 1 to 20 eV, which can effectively activate the gas, break the kinetic limitations of the reaction, and allow the chemical reaction to proceed at room temperature, greatly reducing energy consumption. In addition, the discharge plasma generation unit has a simple structure, a high degree of modularization, good replaceability, and has the advantages of long life and easy maintenance. Therefore, the present invention provides a catalyst-free dry non-thermal CO elimination device, including a CO elimination unit; the CO elimination unit includes a CO elimination unit housing, two gas equalizing pipes and a plurality of plasma generation units.

[0007] In the present invention, the two gas equalizing tubes are symmetrically arranged and are respectively located at the air inlet side and the air outlet side of the shell of the CO elimination unit; a plurality of the plasma generating units are arranged between the two gas equalizing tubes in parallel and without contact with each other. It should be noted that the tail gas to be treated first enters the gas equalizing tube arranged at the air inlet side of the shell of the CO elimination unit and is evenly diverted, and the diverted tail gas enters a plurality of plasma generating units respectively for plasma treatment to eliminate CO in the tail gas, and the gas after CO elimination is then combined with the gas equalizing tube arranged at the air outlet side of the CO elimination unit and discharged together from the air outlet side of the shell of the CO elimination unit.

[0008] It is also necessary to emphasize that, in the present invention, each of the plasma generating units comprises a hollow copper tube and a first metal shell which are coaxially arranged in sequence from the inside to the outside to form a coaxial cylindrical discharge electrode.

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

[0010] The hollow copper tube is used to be electrically connected to the output end of the high voltage power supply to serve as the high voltage side of the discharge; and the outer wall of the air inlet side of the hollow copper tube is sealed with the inner wall of the air inlet side of the first metal shell, and a first insulating sealing block is provided on the air outlet side of the hollow copper tube to seal the air outlet side of the hollow copper tube through the first insulating sealing block. A discharge cavity is formed between the outer wall of the hollow copper tube located in the first metal shell and the inner wall of the first metal shell; a barrier dielectric layer is provided in the discharge cavity; and a second insulating sealing block is provided at one end of the discharge cavity close to the air outlet side of the first metal shell, and an exhaust channel is provided in the middle of the second insulating sealing block, and the air inlet end of the exhaust channel is connected to the discharge cavity; and a plurality of air permeable holes are provided on the tube body of the hollow copper tube located in the first metal shell along its length direction, so that the inside of the hollow copper tube is connected to the discharge cavity.

[0011] It should be noted that when the exhaust gas to be treated enters the corresponding plasma generating unit after being evenly diverted by the gas equalizing pipe on the air inlet side, the exhaust gas first enters the hollow structure of the hollow copper tube from the air inlet end of the hollow copper tube, and the gas in the hollow structure of the hollow copper tube can be released into the discharge cavity through the several air-permeable holes arranged on the tube wall.

[0012] It should also be noted that, compared with solid metal, the hollow structure of the hollow copper tube of the present invention can not only reduce the weight of the device, but also be used for gas to pass through. And the material of the hollow copper tube of the present invention is metallic copper, so that the hollow copper tube of the present invention can be used as a conductive metal. At the same time, a number of small air holes are provided on the hollow copper tube of the present invention, so that when a high-frequency voltage is applied to the hollow copper tube of the present invention, the gas in the hollow copper tube can be uniformly ejected through the small air holes on the hollow copper tube and fill the discharge area, and can be used as an airflow injection device to achieve the effect of equalizing the flow. Among them, in other preferred embodiments of the present invention, the high-frequency voltage used is selected from a kHz AC source (frequency 10kHz~30kHz), a repetitive microsecond pulse source (frequency 10kHz~500kHz) and a kHz modulation voltage, and the voltage amplitude is kV level.

[0013] In some preferred embodiments of the present invention, the blocking dielectric layer is formed by filling ceramic granules with a particle size of 0.5 mm to 2 mm, wherein the ceramic granules have a high dielectric constant and a high secondary electron emission coefficient, and as a blocking dielectric layer, can effectively evenly flow the gas and prolong the gas treatment time in the plasma area; the dielectric layer prevents the continuous arc discharge between the electrodes, resulting in alternating spark discharges on both sides of the dielectric, forming a series of tiny discharge channels. These discharge channels produce high-energy electrons, ions and free radicals, and these active species can participate in chemical reactions; the presence of fillers can increase the surface area of ​​the discharge area, thereby improving the discharge efficiency per unit volume; the dielectric constant of the filler affects the discharge mode and the characteristics of the plasma, and the filler with a high dielectric constant can induce a stronger electric field on its surface, inducing local discharge. Among them, in some more preferred embodiments of the present invention, the blocking dielectric layer is formed by filling zirconium oxide granules with a particle size of 0.5 mm to 2 mm.

[0014] In some preferred embodiments of the present invention, the material of the first metal shell is copper, so as to improve the adsorption of gases such as CO and CO2 by copper metal. However, the present invention takes into account that the adsorption effect of copper metal on gases such as CO and CO2 is not very strong, so the present invention sets the inner surface of the first metal shell to a stepped pattern structure, so that the first metal shell made of metal copper can cooperate with the stepped pattern structure on its surface to increase the surface area of ​​the first metal shell made of metal copper, slightly increase the adsorption effect, and a good adsorption effect can promote the conversion effect; at the same time, this pattern will bring many points of electric field concentration, enhance local discharge, thereby enhancing CO adsorption and increasing local discharge intensity, thereby improving the efficiency of CO elimination.

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

[0016] In some more preferred embodiments of the present invention, the material of the first insulating fixed layer is a heat-resistant insulating hard material, wherein the heat-resistant insulating hard material can be selected from any one of ceramics, polyimide, polytetrafluoroethylene and phenolic plastics.

[0017] In some preferred embodiments of the present invention, an insulating filling layer is further filled between the two gas equalizing flow tubes, the plasma generating unit and the first insulating fixed layer.

[0018] In some more preferred embodiments of the present invention, the insulating filling layer is made of hard elastic insulating heat-resistant particles, wherein the hard elastic insulating heat-resistant particles are organic silicon particles with a particle size of 2 mm to 5 mm.

[0019] In some preferred embodiments of the present invention, the outlet end of the gas equalizing flow tube arranged on the air inlet side of the shell of the CO elimination unit is provided with a plurality of air outlets to evenly divert the input exhaust gas; the inlet end of the gas equalizing flow tube arranged on the air outlet side of the shell of the CO elimination unit is provided with a plurality of air inlets corresponding to the plurality of air outlets one by one; the inlet side of each of the plasma generating units is respectively connected to the corresponding air outlet, and the outlet side of each of the plasma generating units is respectively connected to the corresponding air inlet, so that the plurality of plasma generating units are arranged in parallel and without contact with each other between the two gas equalizing flow tubes, so as to perform plasma treatment on the exhaust gas after even diversion.

[0020] In some preferred embodiments of the present invention, the catalyst-free dry non-thermal CO elimination device also includes a gas pretreatment unit, and the gas pretreatment unit is arranged at the front end of the CO elimination unit, so that the gas pretreatment unit and the CO elimination unit are arranged in sequence along the gas delivery 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 treated along the same flow direction to improve the treatment efficiency of CO elimination in the exhaust gas.

[0022] In some preferred embodiments of the present invention, the gas pretreatment unit includes a second metal shell and a plurality of cooling water pipes; the plurality of cooling water pipes are arranged in the second metal shell horizontally and without contact with each other, and the length direction of the plurality of cooling water pipes is parallel to the gas delivery direction in the second metal shell. In some more preferred embodiments of the present invention, the plurality of cooling water pipes are provided with a water inlet and a water outlet, the water inlet is connected to a cooling water source, the water outlet is connected to a water source recovery device, and the delivery direction of the cooling water in the cooling water pipe is reversely parallel to the gas delivery direction in the second metal shell, 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 distributed in a serpentine structure to increase the contact area between the gas and the cooling water pipe, thereby improving 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, wherein 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 fixed layer is provided on the inner wall of the second metal shell, wherein the material of the second insulating fixed layer is a heat-resistant insulating hard material, and the heat-resistant insulating hard material 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 a plurality of the cooling water pipes and the second insulating fixed layer. In some more preferred embodiments of the present invention, the porous ceramic layer is a washable sponge-like sintered microporous ceramic sheet, and the micropore size 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 outside of 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 of pagoda type;

[0030] In some preferred embodiments of the present invention, the material of the gas interface is a high temperature resistant insulating material, and the high temperature resistant insulating material 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 is annular in structure, and its inner wall abuts against the outer wall of the hollow copper tube, and its outer wall close to the air inlet side of the first metal shell abuts against the inner wall of the first metal shell to seal the air inlet 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, and the high temperature resistant insulating material is polytetrafluoroethylene.

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

[0036] In some preferred embodiments of the present invention, the two gas flow equalization tubes are both tempered organic glass tubes, and the insides of the two gas flow equalization tubes are filled with inorganic particles with a diameter of 1 mm to 5 mm to form a porous structure, thereby achieving uniform distribution of the gas through the 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 elimination device provided by the present invention is based on an enhanced packed bed dielectric barrier discharge plasma, controls the discharge mode to be filamentary discharge, and cooperates with the copper-based material to promote the adsorption and decomposition of CO and the metal surface microstructure to promote the gas discharge decomposition, so as to achieve the relevant CO elimination effect. The diesel engine exhaust enters the gas pretreatment unit through the gas pretreatment module, so that the solid particles in the exhaust gas are adsorbed and cooled at the same time, and the gas phase components enter the gas flow pipe of the CO elimination module; the porous ceramic sheet of the gas pretreatment module is in close contact with the serpentine cooling water pipeline of the gas pretreatment module and is cooled, and the inside of the serpentine cooling water pipeline of the gas pretreatment module is flowing cooling water. After the gas enters the CO elimination unit, it is first diverted by the gas flow pipe to different plasma generation units, and the plasma generation unit is a filamentary discharge plasma generation section; the discharge gas atmosphere is a mixed gas of CO and nitrogen oxides, the mixed gas ratio is uncertain, the initial CO concentration is significantly higher than 1000ppm, the conversion pressure is ~100kPa, and the conversion temperature is set to the ambient temperature.

[0039] The catalyst-free dry non-thermal CO elimination device of the present invention can eliminate CO without adding additional catalysts, and has a simple structure, a large number of filamentary discharges, violent discharges, no catalysts, a long service life, can meet the elimination and conversion needs of large-flow CO-containing waste gas, and is easy to scale up.

[0040] The catalyst-free dry non-thermal CO elimination device of the present invention is provided with a stepped pattern structure on the inner surface of the first metal shell to enhance CO adsorption and increase local discharge intensity, thereby enhancing the CO discharge plasma elimination effect.

[0041] The catalyst-free dry non-thermal CO elimination device of the present invention is filled with ceramic material particles with a suitable particle size, a high relative dielectric constant and a high secondary electron emission coefficient as a blocking medium. The high dielectric constant and high secondary electron emission coefficient will enhance the discharge. At the same time, the filling of the blocking medium can inhibit the conversion of the discharge to the arc, maintain the discharge in the filamentary discharge mode, increase the surface discharge of the dielectric ball surface and the filamentary discharge between the dielectric balls, and help improve the CO elimination effect. At the same time, it can increase the residence time of CO in the discharge area / gas-solid two-phase interface, further enhancing the elimination effect.

[0042] Compared with the CO removal devices in the prior art that require the use of catalysts, the catalyst-free dry non-thermal CO removal device of the present invention can operate stably at ambient temperature and pressure without relying on high-cost temperature control equipment. The device has flexible scalability, separates the gas pretreatment module and the CO removal module, and can achieve series or parallel connection between devices by increasing or decreasing the number of units according to specific needs, so as to accurately control the processing capacity and CO removal efficiency. All components are designed to be easy to disassemble and install, which significantly simplifies the maintenance process and ensures the efficient operation and long-term stability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 It is a schematic diagram of the structure of the CO elimination unit in the present invention.

[0044] Figure 2 It is a schematic diagram of the structure of the plasma generating unit in the present invention.

[0045] Figure 3 It is a schematic diagram of the structure of the pretreatment device in the present invention. DETAILED DESCRIPTION

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

[0047] Example 1

[0048] This embodiment provides a catalyst-free dry non-thermal CO elimination device, including a CO elimination unit 1; the CO elimination unit 1 includes a CO elimination unit housing 101, two gas flow equalizing tubes 102 and a plurality of plasma generating units 103.

[0049] In this embodiment, the two gas equalizing pipes 102 are symmetrically arranged and are respectively located at the air inlet side and the air outlet side of the CO elimination unit housing 101; and the plurality of plasma generating units 103 are arranged between the two gas equalizing pipes 102 in parallel and without contact with each other. It should be noted that the tail gas to be treated first enters the gas equalizing pipe 102 arranged at the air inlet side of the CO elimination unit housing 101 and is evenly diverted, and the diverted tail gas enters the plurality of plasma generating units 103 for plasma treatment to eliminate CO in the tail gas, and the gas after elimination of CO is then combined with the gas equalizing pipe 102 arranged at the air outlet side of the CO elimination unit 1, and then discharged from the air outlet side of the CO elimination unit housing 101.

[0050] In this embodiment, each of the plasma generating units 103 includes a hollow copper tube 1031 and a first metal shell 1032 coaxially arranged from the inside to the outside to form a coaxial cylindrical discharge electrode. The first metal shell 1032 is 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 to be electrically connected to the output end of the high voltage power supply to serve as the high voltage side of the discharge. The outer wall of the hollow copper tube 1031 located in the first metal shell 1032 and the inner wall of the first metal shell 1032 form a discharge cavity 1033. The hollow copper tube 1031 located in the first metal shell 1032 is provided with a plurality of air holes 1035 along its length direction so that the inside of the hollow copper tube 1031 is connected to the discharge cavity 1033. Compared with solid metal, the hollow structure of the hollow copper tube 1031 of the present invention can not only reduce the weight of the device, but also be used for gas to pass through. And the material of the hollow copper tube 1031 of the present invention is metallic copper, so that the hollow copper tube 1031 of the present invention can be used as a conductive metal. At the same time, the hollow copper tube 1031 of the present invention is provided with a plurality of small air holes 1035, so that when the exhaust gas to be treated enters the corresponding plasma generating unit 103 after being evenly diverted by the gas equalizing tube 102 on the air inlet side, 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 in the hollow copper tube 1031 can be evenly ejected through the small air holes 1035 on the hollow copper tube 1031 and fill the discharge area, and can be used as an airflow injection device to achieve the function of equalizing flow.

[0052] In this embodiment, a blocking dielectric layer 1034 is provided in the discharge cavity 1033. The blocking dielectric layer 1034 is formed by filling ceramic granules with a particle size of 0.5 mm to 2 mm. The zirconia granules have a high dielectric constant and a high secondary electron emission coefficient. As a blocking dielectric layer 1034, it can effectively evenly distribute the gas and prolong the gas processing time in the plasma area; the blocking dielectric layer 1034 prevents the continuous arc discharge between the electrodes, resulting in alternating spark discharges on both sides of the medium, 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 fillers can increase the surface area of ​​the discharge area, thereby improving the discharge efficiency per unit volume; the dielectric constant of the filler will affect the discharge mode and the characteristics of the plasma. Fillers with high dielectric constants can induce a stronger electric field on its surface, inducing local 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 through the first insulating sealing block 2.

[0054] In this embodiment, a second insulating sealing block 3 is provided at one end of the discharge cavity 1033 close to the gas outlet side of the first metal shell 1032 , an exhaust channel 301 is opened in the middle of the second insulating sealing block 3 , and an 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 a kHz AC source (frequency 10kHz to 30kHz), a repetitive microsecond pulse source (frequency 10kHz to 500kHz) and a kHz modulation voltage, and the voltage amplitude is in the kV level.

[0056] In a preferred embodiment of the present invention, the blocking medium layer 1034 is formed by filling zirconia balls 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, so as to improve the adsorption of gases such as CO and CO2 by copper metal.

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

[0059] In a preferred embodiment of the present invention, an insulating filling layer 105 is further filled between the two gas equalizing tubes 102, the plasma generating unit 103 and the first insulating fixed layer 104, and the insulating filling layer 105 is made of hard elastic insulating heat-resistant particles. The hard elastic insulating heat-resistant particles are organic silicon particles with a particle size of 2 mm to 5 mm.

[0060] In a preferred embodiment of the present invention, the outlet end of the gas equalizing flow tube 102 arranged on the air inlet side of the CO elimination unit housing 101 is provided with a plurality of air outlets to evenly divert the input exhaust gas; the inlet end of the gas equalizing flow tube 102 arranged on the air outlet side of the CO elimination unit housing 101 is provided with a plurality of air inlets corresponding to the plurality of air outlets one by one; the inlet side of each of the plasma generating units 103 is respectively connected to its corresponding air outlet, and the outlet side of each of the plasma generating units 103 is respectively connected to its corresponding air inlet, so that the plurality of plasma generating units 103 are arranged in parallel and without contact with each other between the two gas equalizing flow tubes 102, so as to perform plasma treatment on the exhaust gas after even diversion.

[0061] In a preferred embodiment of the present invention, the catalyst-free dry non-thermal CO elimination device also includes a gas pretreatment unit 2, and the gas pretreatment unit 2 is arranged at the front end of the CO elimination unit 1, so that the gas pretreatment unit 2 and the CO elimination unit 1 are arranged in sequence along the gas delivery 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 treated along the same flow direction to improve the treatment efficiency of CO elimination in the exhaust gas.

[0063] In a preferred embodiment of the present invention, the gas pretreatment unit 2 includes a second metal shell 201 and a plurality of cooling water pipes 202; the plurality of cooling water pipes 202 are arranged in the second metal shell 201 horizontally and without contact with each other, and the length direction of the plurality of cooling water pipes 202 is parallel to the gas delivery direction in the second metal shell 201. Among them, the plurality of cooling water pipes 202 are all provided with a water inlet and a water outlet, the water inlet is connected to a cooling water source, the water outlet is connected to a water source recovery device, and the delivery direction of the cooling water in the cooling water pipe 202 is reversely parallel to the gas delivery direction in the second metal shell 201, so that the cooling water in 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 fixed layer 104 is provided on the inner wall of the CO elimination unit housing 101, and a second insulating fixed layer 203 is provided on the inner wall of the second metal housing 201, and the material of the first insulating fixed layer 104 and the material of the second insulating fixed layer 203 are both heat-resistant insulating hard materials. The heat-resistant insulating hard materials used by the first insulating fixed layer 104 and the second insulating fixed 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 pipe 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, wherein 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 a plurality of the cooling water pipes 202 and the second insulating fixed 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, and the micropore size is 100 μm to 5000 μm.

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

[0069] In a preferred embodiment of the present invention, the air inlet end of the hollow copper tube 1031 extends outward to the outside of 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, and the gas interface 1036 is connected to the corresponding air outlet.

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

[0071] In a preferred embodiment of the present invention, the material of the gas interface 1036 is a high temperature resistant insulating material, and the high temperature resistant insulating material 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 is an annular structure, and its inner wall abuts against the outer wall of the hollow copper tube 1031, and its outer wall close to the air inlet side of the first metal shell 1032 abuts against the inner wall of the first metal shell 1032 to seal the air inlet 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, and the high temperature resistant insulating material is polytetrafluoroethylene.

[0075] In a preferred embodiment of the present invention, a first gas inlet flange 106 is provided on the air inlet side of the first metal shell 1032, and a first fixed sealing hole 107 is provided on the first gas inlet flange 106; a first gas exhaust flange 108 is provided on the air outlet side of the first metal shell 1032, and a second fixed sealing hole 109 is provided on the first gas exhaust 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 shell 201, and a third fixed sealing hole 206 is provided on the second gas inlet flange 205; a second gas exhaust flange 207 is provided on the gas outlet side of the second metal shell 201, and a fourth fixed sealing hole 208 is provided on the second gas exhaust flange 207.

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

[0078] The catalyst-free dry non-thermal CO elimination device provided by the present invention is based on an enhanced packed bed dielectric barrier discharge plasma, controls the discharge mode to be filamentary discharge, and cooperates with the copper-based material to promote the adsorption and decomposition of CO and the metal surface microstructure to promote the gas discharge decomposition, so as to achieve the relevant CO elimination effect. The diesel engine exhaust enters the gas pretreatment unit 2 through the gas pretreatment module, so that the solid particles in the exhaust gas are adsorbed and cooled at the same time, and the gas phase components enter the gas flow pipe 102 of the CO elimination module; the porous ceramic sheet of the gas pretreatment module is in close contact with the serpentine cooling water pipe 202 of the gas pretreatment module and is cooled, and the inside of the serpentine cooling water pipe 202 of the gas pretreatment module is flowing cooling water. After entering the CO elimination unit 1, the gas is first diverted by the gas flow pipe 102 to different plasma generation units 103, and the plasma generation unit 103 is a filamentary discharge plasma generation section; the discharge gas atmosphere is a mixed gas of CO and nitrogen oxides, the mixed gas ratio is uncertain, the initial CO concentration is significantly higher than 1000ppm, the conversion gas pressure is ~100kPa, and the conversion temperature is set to the ambient temperature.

[0079] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0080] In the description of the present invention, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

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

[0082] Obviously, the above embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work 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 invention comprises a CO elimination unit (1); the CO elimination unit (1) comprises a CO elimination unit housing (101), two gas flow equalizing tubes (102) and a plurality of plasma generating units (103); wherein the two gas flow equalizing tubes (102) are symmetrically arranged and respectively located at the gas inlet side and the gas outlet side of the CO elimination unit housing (101); and the plurality of plasma generating units (103) are arranged between the two gas flow equalizing tubes (102) in parallel and without contact with each other. Each of the plasma generating units (103) comprises a hollow copper tube (1031) and a first metal shell (1032) which are coaxially arranged in sequence from the inside to the outside to form a coaxial cylindrical discharge electrode; The first metal shell (1032) is in a cylindrical structure and is arranged in parallel with the CO elimination unit shell (101); the outer surface of the first metal shell (1032) is grounded to serve as a grounding electrode; The hollow copper tube (1031) is used to be electrically connected to the output end of the high-voltage power supply to serve as a discharge high-voltage side; 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 the air outlet side of the hollow copper tube (1031) is provided with a first insulating sealing block (2); The hollow copper tube (1031) is located between the outer wall of the first metal shell (1032) and the inner wall of the first metal shell (1032), forming a discharge cavity (1033); 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) close to 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 an air inlet end of the exhaust channel (301) is connected to the discharge cavity (1033); The hollow copper tube (1031) is located inside the first metal shell (1032) and has a plurality of small air holes (1035) opened along its length direction, so that the inside of the hollow copper tube (1031) is connected with the discharge cavity (1033).

2. The catalyst-free dry non-thermal CO removal device according to claim 1, characterized in that: The blocking medium layer (1034) is formed by filling ceramic particle balls with a particle size of 0.5 mm to 2 mm.

3. The catalyst-free dry non-thermal CO removal device according to claim 1, characterized in that: The material of the first metal shell (1032) is 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 device according to claim 1, characterized in that: A first insulating fixed layer (104) is provided on the inner wall of the CO elimination unit housing (101); An insulating filling layer (105) is also filled between the two gas equalizing tubes (102), the plasma generating unit (103) and the first insulating fixed layer (104).

5. The catalyst-free dry non-thermal CO removal device according to claim 1, characterized in that: The gas flow equalizing pipe (102) disposed on the gas inlet side of the CO elimination unit housing (101) is provided with a plurality of gas outlets at the gas outlet end to evenly distribute the input exhaust gas; The gas inlet end of the gas equalizing pipe (102) disposed on the gas outlet side of the CO elimination unit housing (101) is provided with a plurality of gas inlets corresponding one-to-one to the plurality of gas outlets; The gas inlet side of each plasma generating unit (103) is respectively connected to its corresponding gas outlet, and the gas outlet side of each plasma generating unit (103) is respectively connected to its corresponding gas inlet, so that a plurality of the plasma generating units (103) are arranged in parallel and without contact with each other between the two gas equalizing flow pipes (102), so as to perform plasma treatment on the uniformly divided tail gas.

6. The catalyst-free dry non-thermal CO removal device according to claim 1, characterized in that: The catalyst-free dry non-thermal CO elimination device further comprises a gas pretreatment unit (2); the gas pretreatment unit (2) is arranged at the front end of the CO elimination unit (1); The gas pretreatment unit (2) comprises a second metal shell (201) and a plurality of cooling water pipes (202); The plurality of cooling water pipes (202) are arranged in the second metal shell (201) in a horizontal manner and without contact with each other, and the length direction of the plurality of cooling water pipes (202) is parallel to the gas conveying direction in the second metal shell (201).

7. The catalyst-free dry non-thermal CO removal device according to claim 6, characterized in that: Each of the cooling water pipes (202) is distributed in a serpentine structure.

8. The catalyst-free dry non-thermal CO removal device according to claim 6, characterized in that: The material of each cooling water pipeline (202) is a flexible heat-resistant 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 device according to claim 6, characterized in that: A second insulating fixed layer (203) is provided on the inner wall of the second metal shell (201); the second insulating fixed layer (203) is made of a heat-resistant insulating hard material.

10. The catalyst-free dry non-thermal CO removal device according to claim 6, characterized in that: A porous ceramic layer (204) is filled between the plurality of cooling water pipes (202) and the second insulating fixed layer (203).

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