CN109441594B - Water-cooled NTP generator based on packed bed dielectric barrier discharge - Google Patents
Water-cooled NTP generator based on packed bed dielectric barrier discharge Download PDFInfo
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- CN109441594B CN109441594B CN201811146481.1A CN201811146481A CN109441594B CN 109441594 B CN109441594 B CN 109441594B CN 201811146481 A CN201811146481 A CN 201811146481A CN 109441594 B CN109441594 B CN 109441594B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
Abstract
The invention discloses a water-cooled NTP generator based on packed bed dielectric barrier discharge, which comprises a shell, a discharge area and an insulating layer. The discharge area is composed of a low-voltage electrode, a quartz tube, filling particles and a high-voltage electrode, and the low-voltage electrode, the quartz tube and the high-voltage electrode are coaxially arranged. The insulating layer is formed by compounding multiple materials, the innermost layer is an insulating layer quartz tube, three layers of heat conduction insulating silica gel cloth and insulating adhesive tapes are alternately covered on the outer side of the quartz tube, and organic silicon pouring sealant is filled in the gap of the high-voltage electrode. The shell is made of organic glass, the inner side of the shell is provided with a low-voltage electrode water cooling channel, and the inner layer of the quartz tube of the insulating layer is provided with a high-voltage electrode water cooling channel. The invention can prolong the retention time of the reaction gas, improve the conversion rate of the reaction gas, strengthen the cooling effect of the high-voltage electrode, reduce the temperature of both the inner electrode and the outer electrode through water cooling, further optimize the heat dissipation condition of the NTP generator and inhibit the pyrolysis of the active substances.
Description
Technical Field
The invention belongs to the technical field of diesel engine tail gas aftertreatment, and particularly relates to a water-cooled NTP generator based on packed bed dielectric barrier discharge.
Background
In recent years, with the implementation of the limit of light-duty vehicle pollutant emissions and the measurement method (sixth stage of china), there has been a more severe limitation on pollutants emitted from the diesel engine for the vehicle. Particulate Matter (PM) and Nitrogen Oxides (NO) of diesel engineX) The emission is more, especially the emission of PM, not only easily causes environmental problems such as haze and visibility reduction, but also easily causes respiratory system diseases, and seriously harms human health. Therefore, it is particularly urgent to reduce PM emission of diesel engines. Compared with nation V, the PM emission limit is tightened by about thirty percent in the VI stage of nation. Due to the increasing strictness of emission regulations, the requirements of the emission regulations have not been met only by improving the quality of fuel and optimizing the combustion process, and advanced after-treatment devices have to be added.
A Diesel Particulate Filter (DPF) is one of the most common off-board purification technologies for reducing PM, and the overall PM collection efficiency of the DPF can reach over 90%. However, during DPF trapping, a large amount of PM accumulates, causing DPF clogging, which in turn increases exhaust back pressure and increases fuel consumption. Therefore, the DPF must be regenerated at a proper time. The traditional regeneration mode can be divided into two types according to whether additional regeneration energy is needed: one is called passive regeneration and the other is called active regeneration. Passive regeneration refers to increasing the exhaust temperature without external assistance to achieve a lower combustion temperature for regeneration, and completing the regeneration process, such as catalytic regeneration, fuel catalytic regeneration, continuous regeneration, and the like. The active regeneration is just opposite, the running parameters or the structure of the engine are not changed, the energy is increased through an external mode, and the exhaust temperature is increased, such as electric heating regeneration, microwave heating regeneration, oil injection combustion-supporting regeneration and the like. However, these regeneration methods have some limitations, and even secondary pollution occurs.
The low-temperature plasma technology (Non-thermal plasma, NTP) is a new exhaust gas purification technology. The NTP generator generates O by high-voltage discharge to air3、NO2And active substances with strong oxidizing property. According to different discharge forms, the method can be mainly divided into: glow Discharge (Glow Discharge), Corona Discharge (Corona Discharge), Radio Frequency Discharge (Radio Frequency Discharge), Microwave Discharge (Microwave Discharge), Dielectric Barrier Discharge (DBD), and the like. Among them, the DBD is a gas discharge in which an insulating medium is inserted into a discharge space, and has a wide application range due to its advantages of simple structure, safety, reliability, and the like. The purification mechanism of NTP technology is to utilize O3、NO2The strong oxidizing property of the active material and the PM deposited in the DPF generate complex chemical reaction, and the PM can be oxidized and decomposed under the condition of being far lower than the ignition temperature of the PM, so that the effect of removing the PM is achieved.
The currently designed NTP generator is mainly suitable for air purification, low-temperature sterilization and static simulation gas purification tests. In practical application, how to prolong the detention time of reaction gas in an NTP generator, strengthen the cooling effect of a high-voltage electrode, increase the conversion efficiency, solve the problems of NTP active substance pyrolysis and the like, and further need further research when the technology is successfully applied in the field of diesel engine DPF regeneration.
Disclosure of Invention
The invention provides a water-cooled NTP generator based on packed bed dielectric barrier discharge, aiming at increasing the reaction gas retention time, improving the reaction gas conversion rate, strengthening the cooling effect of a high-voltage electrode, reducing the temperature of the inner side of the high-voltage electrode through water cooling, further optimizing the heat dissipation condition of the generator and inhibiting the active substance from pyrolysis.
The technical scheme adopted by the invention is as follows:
a water-cooled NTP generator based on packed bed dielectric barrier discharge comprises an insulating layer quartz tube, a high-voltage electrode, a low-voltage electrode, a shell, a stainless steel tube joint, a quartz tube joint and an organic glass tube joint, wherein two ends of the high-voltage electrode are respectively connected with the stainless steel tube joint, the outer diameters of the high-voltage electrode and the stainless steel tube joint are consistent, the insulating layer quartz tube is coaxially arranged on the inner side of the high-voltage electrode and the stainless steel tube joint, organic silicon pouring sealant is filled between the insulating layer quartz tube and the inner sides of the high-voltage electrode and the stainless steel tube joint, and the organic silicon pouring sealant is solidified and molded; a quartz tube is coaxially sleeved outside the high-voltage electrode and the stainless steel tube joint, and filling particles are filled in a gap between the quartz tube and the high-voltage electrode and the stainless steel tube joint; a low-voltage electrode is sleeved on the outer side of the quartz tube in an adherence manner, a shell is sleeved on the outer side of the low-voltage electrode in an empty manner, and a low-voltage electrode water cooling channel is formed between the shell and the outer side of the low-voltage electrode; the inner ring of the quartz tube of the insulating layer is a high-voltage electrode water cooling channel, and the insulating layer has certain heat conductivity, so that internal and external double water cooling is formed.
The stainless steel pipe joints at two ends are symmetrically sleeved with a quartz pipe joint and an organic glass pipe joint, the organic glass pipe joint is sleeved outside the quartz pipe and is connected with the shell, a cooling water channel interface on the organic glass pipe joint at one end is communicated with a cooling water channel interface at the other end through a low-voltage electrode water cooling channel, the organic glass pipe joint is also provided with a grounding wire hole, and a grounding electrode wire is connected with a low-voltage electrode through the grounding wire hole; the quartz pipe joint is sleeved outside the stainless steel pipe joint and connected with the quartz pipe, a gas channel interface on the quartz pipe joint at one end is communicated with the quartz pipe joint at the other end through a gap filled with filling particles, the quartz pipe joint is also provided with a high-voltage wire hole, one end of a high-voltage electrode wire passing through the high-voltage wire hole is connected with a high-voltage electrode, and the other end of the high-voltage electrode wire is connected with an external power supply.
Further, the insulating layer quartz tube is formed by covering a layer of heat-conducting insulating silica gel cloth on the outer side of the quartz tube, covering an insulating adhesive tape on the outer side of the heat-conducting insulating silica gel cloth, and alternately covering three layers, wherein the heat-conducting insulating silica gel cloth has a heat conductivity coefficient of 1.0W/(m.K)-1。
Further, the low-voltage electrode is made of stainless steel; the high-voltage electrode is made of 316L stainless steel, and the outer side surface of the high-voltage electrode is polished to be in a mirror surface state.
Furthermore, the filling particles are alpha-activated alumina with the particle size of 1 mm.
Furthermore, the heat conductivity coefficient of the organic silicon pouring sealant is 1.1W/(m.K)-1。
Furthermore, the joint of the quartz pipe joint and the quartz pipe is sealed by a flat gasket for sealing.
Furthermore, the joint of the organic glass pipe joint and the shell is sealed by a flat gasket for sealing.
Further, the shell is a transparent organic glass tube.
The invention has the beneficial effects that:
the shell of the generator is a transparent organic glass tube, and the flowing condition of the cooling water can be observed when the generator runs; the high-voltage electrode is completely built in the generator, so that the safety is high; active alumina particles are filled in a discharge area of the generator, so that the flow speed of the reaction gas can be slowed down, and the residence time of the reaction gas is prolonged; and the filling particles can play a role in distorting an electric field in a discharge region, change phases to strengthen the electric field strength and improve the productivity of active substances. The existence of the insulating layer can enable the high-voltage electrode to discharge, and the inner side of the high-voltage electrode can reduce the temperature through water cooling, so that double water cooling inside and outside the high-voltage electrode is realized, the heat dissipation condition of the generator is optimized, and the pyrolysis of active substances is inhibited.
Drawings
FIG. 1 is a schematic diagram of a water-cooled NTP generator based on packed bed dielectric barrier discharge;
FIG. 2 is a partial schematic diagram of a water-cooled NTP generator structure based on packed bed dielectric barrier discharge;
FIG. 3 is a partial schematic diagram of a water-cooled NTP generator structure based on packed bed dielectric barrier discharge;
figure 4 is a cross-sectional view of a water-cooled NTP generator discharge zone based on packed bed dielectric barrier discharge;
figure 5 is a cross-sectional view of the insulating layer of a water-cooled NTP generator based on packed bed dielectric barrier discharge;
in the figure, 1, a quartz pipe joint, 2, an organic glass pipe joint, 3, a stainless steel pipe joint, 4, a shell, 5, a quartz pipe, 6, a high-voltage electrode, 7, a low-voltage electrode, 8, organic silicon pouring sealant, 9, filling particles, 10, a grounding wire hole, 11, a gas channel interface, 12, a cooling water channel interface, 13, a high-voltage electrode water cooling channel, 14, a low-voltage electrode water cooling channel, 15, a sealing ring, 16, a flat gasket for sealing, 17, an O-shaped sealing ring, 18, a flat gasket for sealing, 19, a high-voltage wire hole, 20, a grounding electrode wire, 21, a high-voltage electrode wire, 22, an insulating layer quartz pipe, 23, heat-conducting insulating silica cloth, 24 and an insulating tape.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
As shown in fig. 1, 2, 3 and 4, the invention is a water-cooled NTP generator based on packed bed dielectric barrier discharge, two ends of a high-voltage electrode 6 are respectively connected with a stainless steel pipe joint 3, the two are coaxially arranged, the outer diameters of the high-voltage electrode 6 and the stainless steel pipe joint 3 are consistent, the high-voltage electrode 6 and the stainless steel pipe joint 3 are connected through threads, the high-voltage electrode is made of 316L stainless steel, the outer diameter is 48mm, the wall thickness is 4mm, and the surface of an outer discharge area is polished to be in a mirror surface state; an insulating layer quartz tube 22 is arranged on the inner side of the high-voltage electrode 6 and the stainless steel tube joint 3 coaxially with the high-voltage electrode 6 and the stainless steel tube joint 3, and in the embodiment, the quartz tube 22 with the insulating layer has an outer diameter of 20mm and a wall thickness of 3mmThen, both ends are connected and are subjected to burning treatment, and the outer side of the quartz tube is covered with a layer with the thermal conductivity coefficient of 1.0W/(m.K)-1Referring to fig. 5, the heat-conducting insulating silicone cloth 23 is covered with an insulating tape 24, and the three layers are alternately wrapped to form an insulating layer quartz tube 22, so that the insulating effect is enhanced and leakage is effectively prevented during glue filling.
Pouring an organic silicon pouring sealant 8 between the insulating layer quartz tube 22 and the high-voltage electrode 6 and the inner side of the stainless steel tube joint 3, fixing and forming, wherein the heat conductivity coefficient of the organic silicon pouring sealant 8 is 1.1W/(m.K)-1In order to prevent air bubbles from being retained in areas on the outer side of a quartz tube 22 of an insulating layer and the inner side of a high-voltage electrode 6 during glue pouring, chamfering is carried out on one opposite end of two stainless steel tube joints 3, the high-voltage electrode 6 and the outer side of the stainless steel tube joints 3 are coaxially sleeved with the quartz tube 5, the outer diameter of the quartz tube 5 is 56mm, the wall thickness is 2mm, and burning openings are respectively formed at two ends of the quartz tube 5;
as shown in fig. 3, a quartz pipe joint 1 and an organic glass pipe joint 2 are symmetrically sleeved on a stainless steel pipe joint 3 at two ends, the organic glass pipe joint 2 is sleeved outside a quartz pipe 5 and is connected with a shell 4, the joint of the organic glass pipe joint 2 and the shell 4 is sealed by a flat gasket 16 for sealing, so that a low-voltage electrode water cooling channel 14 is sealed, the joint of the organic glass pipe joint 2 and a low-voltage electrode 7 is sealed by two rings of O-shaped sealing rings 17, a cooling water channel interface 12 on the organic glass pipe joint 2 at one end is communicated with a cooling water channel interface 12 at the other end through the low-voltage electrode water cooling channel 14, the organic glass pipe joint 2 is further provided with a grounding wire hole 10, and a grounding electrode wire; the grounding wire hole 10 is sealed by single-component silica gel, and the grounding electrode wire 20 is tightly hooped outside the low-voltage electrode 7 through a stainless steel wire.
As shown in fig. 2, the quartz tube joint 1 is sleeved outside the stainless steel tube joint 3 and connected with the quartz tube 5, and a flat gasket 18 for sealing is arranged at the joint so as to seal the discharge region; the gas channel interface 11 on the quartz tube joint 1 of one end is communicated with the quartz tube joint 1 of the other end through the discharge area filled with the filling particles 9, the quartz tube joint 1 is also provided with a high-voltage wire hole 19, one end of a high-voltage electrode wire 21 is connected with a high-voltage electrode 6 through the high-voltage wire hole 19, the other end of the high-voltage electrode wire 21 is led out from the high-voltage wire hole 19 and connected with an external power supply, and the high-voltage wire hole 19 is sealed by single-component; the high-voltage electrode lead 21 is uniformly attached to the outer side of the high-voltage electrode 6 by a high-temperature resistant and corrosion resistant insulating adhesive tape.
In order to make the technical scheme of the invention more clear, the following is further explained by combining the working process of the invention:
in the working process of the invention, the high-voltage electrode 6 is connected with an external power supply through a high-voltage electrode lead 21, the low-voltage electrode 7 is grounded through a grounded lead hole 10, reaction gas enters from a gas channel interface 11 at one end and passes through a discharge area filled with filling particles 9, the high-voltage electrode 6 discharges the reaction gas to generate active substances during the period, and finally the reaction gas and the active substances are discharged out of the reactor through the gas channel interface 11 at the other end; cooling water of the low-voltage electrode 7 enters from a cooling water channel interface 12 at one end, and is cooled by a low-voltage electrode water cooling channel 14, and finally is discharged out of the reactor from the cooling water channel interface 12 at the other end; the cooling water of the high-voltage electrode 6 enters from one section of the high-voltage electrode water-cooling channel 13 at the inner side of the insulating layer quartz tube 22, and is discharged from the other end, thereby realizing the cooling of the high-voltage electrode 6.
The above embodiments are only used for illustrating the design idea and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present invention and implement the present invention accordingly, and the protection scope of the present invention is not limited to the above embodiments. Therefore, all equivalent changes and modifications made in accordance with the principles and concepts disclosed herein are intended to be included within the scope of the present invention.
Claims (9)
1. The water-cooled NTP generator based on packed bed dielectric barrier discharge is characterized by comprising an insulating layer quartz tube (22), a high-voltage electrode (6), a low-voltage electrode (7), a shell (4), a stainless steel tube joint (3), a quartz tube joint (1) and an organic glass tube joint (2), wherein two ends of the high-voltage electrode (6) are respectively connected with the stainless steel tube joint (3), the outer diameters of the high-voltage electrode (6) and the stainless steel tube joint (3) are consistent, the insulating layer quartz tube (22) is coaxially arranged on the inner sides of the high-voltage electrode (6) and the stainless steel tube joint (3), and organic silicon pouring sealant (8) is poured between the insulating layer quartz tube (22) and the inner sides of the high-voltage electrode (6) and the stainless steel tube joint (3) for solidification molding; a quartz tube (5) is coaxially sleeved outside the high-voltage electrode (6) and the stainless steel tube joint (3), and filling particles (9) are filled in gaps among the quartz tube (5), the high-voltage electrode (6) and the stainless steel tube joint (3); a low-voltage electrode (7) is sleeved on the outer side of the quartz tube (5) in an adherence manner, a shell (4) is sleeved on the outer side of the low-voltage electrode (7) in an empty manner, and a low-voltage electrode water-cooling channel (14) is formed between the shell (4) and the outer side of the low-voltage electrode (7);
the stainless steel pipe joint (3) is symmetrically sleeved with a quartz pipe joint (1) and an organic glass pipe joint (2) at two ends, the organic glass pipe joint (2) is sleeved outside a quartz pipe (5) and is connected with a shell (4), a cooling water channel interface (12) on the organic glass pipe joint (2) at one end is communicated with a cooling water channel interface (12) at the other end through a low-voltage electrode water cooling channel (14), the organic glass pipe joint (2) is also provided with a grounding wire hole (10), and a grounding electrode wire (20) is connected with a low-voltage electrode (7) through the grounding wire hole (10); the quartz pipe joint (1) is sleeved on the outer side of the stainless steel pipe joint (3) and is connected with the quartz pipe (5), a gas channel interface (11) on the quartz pipe joint (1) at one end is communicated with the quartz pipe joint (1) at the other end through a gap filled with filling particles (9), the quartz pipe joint (1) is further provided with a high-voltage wire hole (19), one end of a high-voltage electrode wire (21) is connected with a high-voltage electrode (6) through the high-voltage wire hole (19), and the other end of the high-voltage electrode wire (21) is connected with an external power supply.
2. The water-cooled NTP generator based on packed bed dielectric barrier discharge according to claim 1, wherein the insulating layer quartz tube (22) is formed by covering a layer of heat-conducting insulating silica gel cloth (23) on the outer side of the quartz tube, covering an insulating adhesive tape (24) on the outer side of the heat-conducting insulating silica gel cloth (23), and alternately covering three layers, and the heat conductivity coefficient of the heat-conducting insulating silica gel cloth (23) is 1.0W/(m-K).
3. The water-cooled NTP generator based on packed bed dielectric barrier discharge according to claim 1, wherein the low voltage electrode (7) is made of stainless steel; the high-voltage electrode (6) is 316L stainless steel, and the outer surface of the high-voltage electrode (6) is polished to be in a mirror surface state.
4. The water-cooled NTP generator based on packed bed dielectric barrier discharge according to claim 1, wherein the packed particles (9) are selected from alpha-activated alumina and have a particle size of 1 mm.
5. The water-cooled NTP generator based on packed bed dielectric barrier discharge according to claim 1, wherein the heat conductivity coefficient of the silicone pouring sealant (8) is 1.1W/(m-K).
6. The water-cooled NTP generator based on packed bed dielectric barrier discharge according to claim 1, wherein the joint of the quartz tube joint (1) and the quartz tube (5) is sealed by a flat gasket (18) for sealing.
7. The water-cooled NTP generator based on packed bed dielectric barrier discharge according to claim 1, wherein the joint of the plexiglas tube connector (2) and the shell (4) is sealed by a flat sealing washer (16).
8. The water-cooled NTP generator based on packed bed dielectric barrier discharge according to claim 1, wherein the housing (4) is a transparent plexiglas tube.
9. The water-cooled NTP generator based on packed bed dielectric barrier discharge according to claim 1, wherein the area between the inner side of the shell (4) and the outer side of the low-voltage electrode (7) is a low-voltage electrode water cooling channel (14), and the inner ring of the insulating layer quartz tube (22) is a high-voltage electrode water cooling channel (13).
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| CN110072323A (en) * | 2019-03-18 | 2019-07-30 | 江苏大学 | A kind of NTP generator of optimization heat dissipation |
| CN112738967B (en) * | 2020-12-28 | 2023-10-20 | 苏州爱特维电子科技有限公司 | Large-area dielectric barrier plasma discharge electrode plate combination |
| CN113477199A (en) * | 2021-06-29 | 2021-10-08 | 浙江理工大学 | Ultra-low temperature discharge unit |
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| JP3271005B2 (en) * | 1999-08-19 | 2002-04-02 | 独立行政法人産業技術総合研究所 | Plasma decomposition apparatus and decomposition method for chlorofluorocarbon or fluorine compound |
| JP3607905B2 (en) * | 2002-10-22 | 2005-01-05 | 東芝三菱電機産業システム株式会社 | Ozone generator |
| CN205398116U (en) * | 2016-03-03 | 2016-07-27 | 陈雷 | Ozone generator |
| CN105692562B (en) * | 2016-04-26 | 2018-09-07 | 北京天择昌宁环境技术股份有限公司 | The base unit component and Ozone generator module of dielectric barrier discharge plate, panel type ozone producer |
| CN108554631B (en) * | 2018-06-04 | 2023-08-22 | 江苏大学 | Coaxial Multistage NTP Generator Based on Dielectric Barrier Discharge |
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