CN105927316B - A kind of vehicle exhaust double purification device and its course of work - Google Patents
A kind of vehicle exhaust double purification device and its course of work Download PDFInfo
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- CN105927316B CN105927316B CN201610410525.1A CN201610410525A CN105927316B CN 105927316 B CN105927316 B CN 105927316B CN 201610410525 A CN201610410525 A CN 201610410525A CN 105927316 B CN105927316 B CN 105927316B
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- 238000000746 purification Methods 0.000 title claims abstract description 32
- 239000007788 liquid Substances 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 11
- 230000008569 process Effects 0.000 claims abstract description 9
- 238000000889 atomisation Methods 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 76
- 210000002381 plasma Anatomy 0.000 claims description 53
- 239000002245 particle Substances 0.000 claims description 10
- 230000005684 electric field Effects 0.000 claims description 7
- 239000011152 fibreglass Substances 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 238000009827 uniform distribution Methods 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 5
- 239000013618 particulate matter Substances 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 3
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 229930195733 hydrocarbon Natural products 0.000 description 2
- 150000002430 hydrocarbons Chemical class 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 231100000572 poisoning Toxicity 0.000 description 1
- 230000000607 poisoning effect Effects 0.000 description 1
Classifications
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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
- F01N3/01—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust by means of electric or electrostatic separators
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- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
- Treating Waste Gases (AREA)
Abstract
本发明提供了一种汽车尾气二次净化装置及其工作过程，包括排气导管，电源箱，尾气处理液导流腔。排气导管入口处装有气体旋流器，且排气导管通道中装有线管式等离子反应器；尾气处理液导流腔出口处连通有四个切向旋流槽至排气导管出口处。本发明采用了一种线管式等离子反应器，线状中心电极与外层管状电极之间加有高压交流电源，中间空腔中可产生大量分布较为均匀的低温等离子，解决了由于等离子体产生不均匀导致的净化效率低的问题；通过将尾气旋流处理后进入线管式等离子反应器，使旋转气流与空腔中低温等离子充分反应，提高了净化效率；同时尾气处理液经切向旋流槽切向喷入排气管出口处雾化旋转，与尾气充分混合，实现高效的二次净化处理。
The invention provides a secondary purification device for automobile tail gas and its working process, which comprises an exhaust pipe, a power supply box, and a guide chamber for tail gas treatment liquid. A gas swirler is installed at the inlet of the exhaust duct, and a wire-pipe plasma reactor is installed in the channel of the exhaust duct; four tangential swirl grooves are connected to the outlet of the exhaust duct at the outlet of the tail gas treatment liquid diversion cavity. The invention adopts a line-tube plasma reactor, a high-voltage AC power supply is added between the linear center electrode and the outer tubular electrode, and a large amount of low-temperature plasma with relatively uniform distribution can be generated in the middle cavity, which solves the problem of The problem of low purification efficiency caused by inhomogeneity; by treating the tail gas swirl flow into the line-tube plasma reactor, the swirling air flow can fully react with the low-temperature plasma in the cavity, and the purification efficiency is improved; at the same time, the tail gas treatment liquid is tangentially The launder is sprayed tangentially into the outlet of the exhaust pipe for atomization and rotation, and is fully mixed with the exhaust gas to achieve efficient secondary purification treatment.
Description
技术领域：Technical field:
本发明涉及一种汽车尾气二次净化装置及其工作过程，其属于汽车环保技术领域。The invention relates to a secondary purification device for automobile tail gas and its working process, which belongs to the technical field of automobile environmental protection.
背景技术：Background technique:
在世界范围内，汽车尾气已成为最重要的空气污染源之一，其含量最多的有害成分主要为一氧化碳(CO)，氮氧化合物(NOx)，碳氢化合物(HC)和颗粒物(PM)。汽车尾气的排放严重影响了人类的生活和健康，同时危害着城市环境乃至整个自然生态系统，因此限制和治理汽车尾气污染的任务迫在眉睫。Worldwide, automobile exhaust has become one of the most important sources of air pollution, and its most harmful components are mainly carbon monoxide (CO), nitrogen oxides (NO x ), hydrocarbons (HC) and particulate matter (PM). The emission of automobile exhaust seriously affects human life and health, and at the same time endangers the urban environment and even the entire natural ecosystem. Therefore, it is urgent to limit and control the pollution of automobile exhaust.
三效催化技术是目前国际上公认的减少汽车尾气排放的主流技术，但是它依然存在着致命的弱点，比如催化剂和汽车不容易匹配、催化剂“中毒”不好解决、必须采用无铅汽油、空燃比要求非常精确等问题。而低温等离子技术能够有效地解决三效催化技术制约机外净化的难题，低温等离子技术具有制造成本低、能耗低、净化效率高、无二次污染的优点。The three-way catalytic technology is currently recognized internationally as the mainstream technology for reducing vehicle exhaust emissions, but it still has fatal weaknesses, such as the difficulty in matching the catalyst with the vehicle, the difficulty in solving catalyst "poisoning", the need to use unleaded gasoline, air The fuel ratio requires very precise and other issues. The low-temperature plasma technology can effectively solve the problem of three-way catalytic technology restricting external purification. The low-temperature plasma technology has the advantages of low manufacturing cost, low energy consumption, high purification efficiency, and no secondary pollution.
而现有的低温等离子体反应器也存在一些缺陷：一、汽车尾气与反应器中电极接触导致对电极的腐蚀问题；二、汽车尾气中的烟尘容易在电极上积聚，从而影响等离子产生的效率；三、由于反应器中产生的等离子数量不足，分布不均所造成的净化效率降低的问题。However, existing low-temperature plasma reactors also have some defects: 1. The contact between the automobile exhaust gas and the electrodes in the reactor causes corrosion of the electrodes; 2. The smoke and dust in the automobile exhaust gas easily accumulate on the electrodes, thereby affecting the efficiency of plasma generation 3. Due to the insufficient amount of plasma generated in the reactor, the problem of reduced purification efficiency caused by uneven distribution.
发明内容：Invention content:
本发明目的在于提出一种基于旋流变化的低温等离子体汽车尾气二次净化装置及其工作过程，对尾气进行旋流处理后进入一种线管式等离子反应器内充分反应，以克服现有等离子体反应器净化汽车尾气的诸多弊端，同时利用二次处理的方式实现到对汽车尾气的高效净化。The object of the present invention is to propose a low-temperature plasma automobile tail gas secondary purification device and its working process based on swirling changes, and the tail gas is subjected to swirling treatment and then enters a line-tube plasma reactor for full reaction, so as to overcome the existing Plasma reactor purifies many disadvantages of automobile exhaust, and at the same time realizes efficient purification of automobile exhaust by means of secondary treatment.
本发明采用如下技术方案：一种汽车尾气二次净化装置，包括气体旋流器、排气导管、线管式等离子反应器、电源箱、尾气处理液导流腔以及切向旋流槽；所述气体旋流器安装于排气导管入口段处，气体旋流器的外壁与排气导管的内壁相接触；所述线管式等离子反应器安装于排气导管通道中，所述线管式等离子反应器的外壁与排气导管的内壁相接触，且线管式等离子反应器的末端与排气导管的底部相接触；所述排气导管的外表面与尾气处理液导流腔相安装于一起，尾气处理液导流腔的入口接供液导管；所述尾气处理液导流腔的出口是一个等厚圆周开口面，连通有四个均匀分布的切向旋流槽，所述切向旋流槽延伸至排气导管出口处。The present invention adopts the following technical solutions: a secondary purification device for automobile exhaust gas, including a gas cyclone, an exhaust conduit, a wire-pipe plasma reactor, a power supply box, a tail gas treatment liquid diversion cavity, and a tangential swirl tank; The gas cyclone is installed at the inlet section of the exhaust duct, and the outer wall of the gas cyclone is in contact with the inner wall of the exhaust duct; the line-tube plasma reactor is installed in the exhaust duct channel, and the line-tube plasma reactor The outer wall of the plasma reactor is in contact with the inner wall of the exhaust duct, and the end of the line-pipe plasma reactor is in contact with the bottom of the exhaust duct; the outer surface of the exhaust duct is installed on the Together, the inlet of the tail gas treatment liquid diversion cavity is connected to the liquid supply conduit; the outlet of the tail gas treatment liquid diversion cavity is an equal-thickness circumferential opening surface, connected with four evenly distributed tangential swirl grooves, the tangential The swirl slot extends to the outlet of the exhaust duct.
进一步地，所述气体旋流器包括外旋流叶片、内旋流叶片以及将外旋流叶片和内旋流叶片相间隔开的中间套环，所述外旋流叶片的数量为12片，叶片角度为60°，所述内旋流叶片数量为12片，叶片角度为60°。Further, the gas swirler includes outer swirl blades, inner swirl blades, and an intermediate collar that separates the outer swirl blades from the inner swirl blades, and the number of outer swirl blades is 12. The blade angle is 60°, the number of the internal swirl blades is 12, and the blade angle is 60°.
进一步地，所述线管式等离子反应器包括线状中心电极和外层管状电极，线状中心电极外附一层第一绝缘层，且外层管状电极内附一层第二绝缘层。Further, the line-tube plasma reactor includes a linear central electrode and an outer tubular electrode, a first insulating layer is attached to the linear central electrode, and a second insulating layer is attached to the outer tubular electrode.
进一步地，所述第一绝缘层和第二绝缘层均采用玻璃钢材质，且从尾气流入端到流出端，第二绝缘层存在由小到大的厚度梯度。Further, both the first insulating layer and the second insulating layer are made of glass fiber reinforced plastic, and there is a thickness gradient from small to large in the second insulating layer from the tail gas inlet end to the outlet end.
进一步地，所述电源箱中包括一级逆变电路、整流电路、二级逆变电路、升压变压器，与一级逆变电路相连的输入端为12V车载直流电源，与升压变压器相连的电源输出为电压5kV～20kV，频率10kHz～30kHz的高频高压交流电源。Further, the power box includes a first-level inverter circuit, a rectifier circuit, a second-level inverter circuit, and a step-up transformer. The input terminal connected to the first-level inverter circuit is a 12V vehicle-mounted DC power supply, and the input terminal connected to the step-up transformer The power output is a high-frequency high-voltage AC power supply with a voltage of 5kV to 20kV and a frequency of 10kHz to 30kHz.
进一步地，所述线状中心电极固定于线管式等离子反应器中心部位，且线状中心电极作为电源连接端，与高频高压交流电源连接。Further, the linear central electrode is fixed at the central part of the line-tube plasma reactor, and the linear central electrode is used as a power connection terminal to connect to a high-frequency high-voltage AC power supply.
进一步地，所述切向旋流槽为螺旋线形。Further, the tangential swirl groove is helical.
本发明还采用如下技术方案：一种汽车尾气二次净化装置的工作过程，包括如下步骤：The present invention also adopts the following technical scheme: a working process of a secondary purification device for automobile exhaust, comprising the following steps:
一：当汽车发动机启动时，电源箱中电源工作供电，线管式等离子反应器中接有高频高压交流电源的线状中心电极和外层管状电极放电，由于第二绝缘层存在的厚度梯度，两电极间产生梯度电场，在梯度电场的作用下，第一绝缘层和第二绝缘层之间的空腔内迅速产生大量分布均匀的低温等离子体；One: When the car engine is started, the power supply in the power box works to supply power, and the linear central electrode and the outer tubular electrode connected to the high-frequency and high-voltage AC power supply in the line tube plasma reactor discharge, due to the thickness gradient of the second insulating layer , a gradient electric field is generated between the two electrodes, under the action of the gradient electric field, a large number of uniformly distributed low-temperature plasmas are rapidly generated in the cavity between the first insulating layer and the second insulating layer;
二：发动机运行工作产生的尾气进入排气导管，经过入口段气体旋流器旋流处理后，尾气沿排气导管通道旋转进入线管式等离子反应器；Two: The exhaust gas generated by the engine operation enters the exhaust duct, and after being treated by the gas swirler in the inlet section, the exhaust gas rotates along the exhaust duct channel and enters the wire-and-tube plasma reactor;
三：通过离子化的过程，旋转气流中的悬浮颗粒物与有害气体被有效分开，其中，有害气体与等离子体中的活性粒子充分反应，迅速降解为无害成分；悬浮颗粒物随旋转气流排出，在尾气导管的出口出处，经切向旋流槽雾化旋流喷出的尾气处理液与排出的尾气充分混合，悬浮颗粒物被沉降处理，实现了对尾气的二次净化，最终，经二次高效净化的无害气体被排入大气中。Three: Through the process of ionization, the suspended particles and harmful gases in the swirling airflow are effectively separated. Among them, the harmful gases fully react with the active particles in the plasma and are quickly degraded into harmless components; the suspended particles are discharged with the rotating airflow, At the outlet of the tail gas duct, the tail gas treatment liquid sprayed out by the tangential swirl tank atomization swirl is fully mixed with the exhausted tail gas, and the suspended particles are settled and treated to realize the secondary purification of the tail gas. Finally, after the second high-efficiency The purified harmless gas is discharged into the atmosphere.
本发明具有如下有益效果：The present invention has following beneficial effect:
(1).本发明采用了介质阻挡放电产生等离子的方法，具有大空间内放电均匀和高气压运行稳定的特点。对能量利用效率高、控制性能好、可操作性能高。故对于汽车尾气净化的可行性最高、适用性最强。(1). The invention adopts the method of dielectric barrier discharge to generate plasma, which has the characteristics of uniform discharge in a large space and stable operation under high pressure. It has high energy utilization efficiency, good control performance and high operability. Therefore, it has the highest feasibility and the strongest applicability for automobile exhaust purification.
(2).本发明采用了一种线管式等离子反应器，线状中心电极与外层管状电极之间加有高频高压交流电源，中间空腔中可产生大量分布较为均匀的低温等离子，解决了由于等离子体产生不均匀导致的净化效率低的问题。这种线管式等离子反应器能够和汽车排气管道配合良好，更适用于汽车尾气处理。(2). The present invention adopts a line-tube plasma reactor. A high-frequency high-voltage AC power supply is added between the linear center electrode and the outer tubular electrode, and a large amount of relatively uniformly distributed low-temperature plasma can be generated in the middle cavity. The problem of low purification efficiency due to uneven plasma generation is solved. The line-tube plasma reactor can be well matched with the exhaust pipe of the automobile, and is more suitable for the treatment of the exhaust gas of the automobile.
(3).本发明采用了一种线管式等离子反应器，中心线状电极外附有一层第一绝缘层，且外层的管状电极内附有一层第二绝缘层。第一绝缘层和第二绝缘层均采用玻璃钢材质，有极好的耐腐蚀性，避免了汽车尾气对电极的腐蚀，同时也解决了尾气中的烟尘容易在电极上积聚，从而影响等离子产生的效率的问题。除此之外，对于外层管状电极内附的第二绝缘层，从尾气流入端到流出端，该第二绝缘层存在由小到大的厚度梯度，这样使得反应器中间空腔能产生梯度电场，增强了反应器的净化效果。(3). The present invention adopts a wire-tube plasma reactor, a first insulating layer is attached to the center wire-shaped electrode, and a second insulating layer is attached to the outer tubular electrode. Both the first insulating layer and the second insulating layer are made of glass fiber reinforced plastic, which has excellent corrosion resistance, avoids the corrosion of the electrode by automobile exhaust, and also solves the problem that the smoke and dust in the exhaust gas are easy to accumulate on the electrode, thereby affecting the generation of plasma. The problem of efficiency. In addition, for the second insulating layer attached to the outer tubular electrode, from the tail gas inflow end to the outflow end, the second insulation layer has a thickness gradient from small to large, so that the middle cavity of the reactor can produce a gradient The electric field enhances the purification effect of the reactor.
(4).本发明将尾气通过气体旋流器内外旋流叶片的旋流处理后进入线管式等离子反应器，使旋转气流与空腔中低温等离子充分反应，提高了净化效率；同时，线管式等离子反应器中间腔内的活性放电物质会随着旋转气流运动而更均匀地分布于空间中，使得通道内等离子分布更加均匀。(4). The present invention enters the line-tube plasma reactor after the exhaust gas is processed by the swirl flow of the inner and outer swirl blades of the gas swirler, so that the swirling air flow can fully react with the low-temperature plasma in the cavity, and the purification efficiency is improved; at the same time, the line The active discharge material in the middle chamber of the tubular plasma reactor will be more evenly distributed in the space with the movement of the rotating air flow, so that the plasma distribution in the channel is more uniform.
(5).本发明在排气导管外部装配有尾气处理液导流腔，导流腔入口可接供液导管。尾气处理液经旋流槽切向喷入排气管出口处雾化旋转，与尾气充分混合，实现了对尾气的二次高效净化。(5). The present invention is equipped with an exhaust gas treatment fluid diversion cavity outside the exhaust conduit, and the inlet of the diversion cavity can be connected to a liquid supply conduit. The tail gas treatment liquid is sprayed tangentially into the outlet of the exhaust pipe through the swirl tank, atomized and rotated, and fully mixed with the tail gas, realizing the secondary high-efficiency purification of the tail gas.
(6).本发明设计了线管式等离子反应器的配套电源，将12V的车载直流电首先经过一级逆变升压整流后转换为相对较高压直流电，再经过二级逆变得到了所需的高压高频交流电源。这样的电源设计方案，使得每次的升压比得到了减少，提高了能量的传递效率和稳定性。(6). The present invention designs the supporting power supply of the line-tube plasma reactor. The 12V vehicle-mounted direct current is firstly converted into a relatively high-voltage direct current through a first-stage inverter step-up rectification, and then obtained through a second-stage inverter. high-voltage high-frequency AC power supply. Such a power supply design scheme reduces the step-up ratio each time and improves energy transfer efficiency and stability.
附图说明：Description of drawings:
图1是本发明汽车尾气二次净化装置的结构示意图。Fig. 1 is the schematic structural view of the automobile exhaust secondary purification device of the present invention.
图2是本发明线管式等离子反应器的结构示意图。Fig. 2 is a schematic structural view of the line-and-tube plasma reactor of the present invention.
图3是本发明电源箱高频高压交流电源的电路原理框图。Fig. 3 is a block diagram of the circuit principle of the high-frequency and high-voltage AC power supply of the power box of the present invention.
图4是本发明气体旋流器的结构三维图。Fig. 4 is a three-dimensional view of the structure of the gas cyclone of the present invention.
图5是本发明气体旋流器的正视图。Fig. 5 is a front view of the gas cyclone of the present invention.
图6为本发明气体旋流器的侧视图。Fig. 6 is a side view of the gas cyclone of the present invention.
图7是本发明切向旋流槽的结构三维图。Fig. 7 is a three-dimensional view of the structure of the tangential swirl tank of the present invention.
图8是本发明切向旋流槽的正视图。Fig. 8 is a front view of the tangential swirl tank of the present invention.
图9为本发明切向旋流槽的侧视图。Fig. 9 is a side view of the tangential swirl groove of the present invention.
其中：in:
1气体旋流器；1-1外旋流叶片；1-2内旋流叶片；1-3中间套环；2排气导管；3线管式等离子反应器；3-1线状中心电极；3-2外层管状电极；3-3第一绝缘层；3-4第二绝缘层；4电源箱；5尾气处理液导流腔；6切向旋流槽。1 gas cyclone; 1-1 external swirl blade; 1-2 internal swirl blade; 1-3 middle collar; 2 exhaust duct; 3-2 outer tubular electrode; 3-3 first insulating layer; 3-4 second insulating layer; 4 power supply box;
具体实施方式：Detailed ways:
请参照图1至图9所示，本发明汽车尾气二次净化装置包括气体旋流器1、排气导管2、线管式等离子反应器3、电源箱4、尾气处理液导流腔5以及切向旋流槽6；气体旋流器1安装于排气导管2入口段处，该气体旋流器1的外壁与排气导管2的内壁相接触；排气导管2通道中装有线管式等离子反应器3，该线管式等离子反应器3的外壁与排气导管2的内壁相接触，且线管式等离子反应器3的末端与排气导管2的底部相接触。排气导管2的外表面与尾气处理液导流腔5相安装于一起，尾气处理液导流腔5的入口可接供液导管；尾气处理液导流腔5的出口是一个等厚圆周开口面，连通有四个均匀分布的切向旋流槽6，切向旋流槽6为螺旋线形，且切向旋流槽6延伸至排气导管出口处。Please refer to Fig. 1 to shown in Fig. 9, automobile exhaust secondary purification device of the present invention comprises gas cyclone 1, exhaust duct 2, line-pipe type plasma reactor 3, power supply box 4, tail gas treatment liquid guide cavity 5 and Tangential swirl groove 6; the gas cyclone 1 is installed at the inlet section of the exhaust duct 2, and the outer wall of the gas cyclone 1 is in contact with the inner wall of the exhaust duct 2; Plasma reactor 3 , the outer wall of the line-pipe plasma reactor 3 is in contact with the inner wall of the exhaust duct 2 , and the end of the line-pipe plasma reactor 3 is in contact with the bottom of the exhaust duct 2 . The outer surface of the exhaust conduit 2 is installed together with the tail gas treatment liquid diversion chamber 5, the inlet of the tail gas treatment liquid diversion chamber 5 can be connected to the liquid supply conduit; the outlet of the tail gas treatment liquid diversion chamber 5 is a circumferential opening of equal thickness On the surface, there are four uniformly distributed tangential swirl grooves 6 in communication. The tangential swirl grooves 6 are helical, and the tangential swirl grooves 6 extend to the outlet of the exhaust duct.
气体旋流器1包括外旋流叶片1-1、内旋流叶片1-2以及将外旋流叶片1-1和内旋流叶片1-2相间隔开的中间套环1-3，其中外旋流叶片1-1的数量为12片，叶片角度为60°；内旋流叶片1-2数量为12片，叶片角度为60°。The gas swirler 1 includes an outer swirl vane 1-1, an inner swirl vane 1-2, and an intermediate collar 1-3 that separates the outer swirl vane 1-1 from the inner swirl vane 1-2, wherein The number of outer swirl blades 1-1 is 12, and the blade angle is 60°; the number of inner swirl blades 1-2 is 12, and the blade angle is 60°.
线管式等离子反应器3通过介质阻挡放电产生等离子体，其包括一个线状中心电极3-1和外层管状电极3-2，线状中心电极3-1外附一层第一绝缘层3-3，且外层管状电极3-2内附一层第二绝缘层3-4。第一绝缘层3-3和第二绝缘层3-4均采用玻璃钢材质，且从尾气流入端到流出端，第二绝缘层3-4存在由小到大的厚度梯度The line-tube plasma reactor 3 generates plasma through dielectric barrier discharge, which includes a linear central electrode 3-1 and an outer tubular electrode 3-2, and a first insulating layer 3 attached to the linear central electrode 3-1 -3, and a second insulating layer 3-4 is attached inside the outer tubular electrode 3-2. Both the first insulating layer 3-3 and the second insulating layer 3-4 are made of glass fiber reinforced plastic, and there is a thickness gradient from small to large in the second insulating layer 3-4 from the exhaust gas inlet end to the outlet end
电源箱4中包括一级逆变电路8、整流电路9、二级逆变电路10、升压变压器11，与一级逆变电路8相连的输入端为12V车载直流电源7，与升压变压器11相连的电源输出12为电压5kV～20kV，频率10kHz～30kHz的高频高压交流电源。The power box 4 includes a primary inverter circuit 8, a rectifier circuit 9, a secondary inverter circuit 10, and a step-up transformer 11. The input terminal connected to the primary inverter circuit 8 is a 12V vehicle-mounted DC power supply 7, which is connected to the step-up transformer. The power output 12 connected with 11 is a high-frequency high-voltage AC power supply with a voltage of 5kV-20kV and a frequency of 10kHz-30kHz.
线状中心电极3-1由两个绝缘支架固定于线管式等离子反应器3中心部位，且线状中心电极3-1作为电源连接端，与高频高压交流电源连接。The linear central electrode 3-1 is fixed on the central part of the wire-tube plasma reactor 3 by two insulating brackets, and the linear central electrode 3-1 is used as a power connection terminal to connect with a high-frequency high-voltage AC power supply.
本发明汽车尾气二次净化装置的工作过程如下：The working process of the automobile exhaust secondary purification device of the present invention is as follows:
一：当汽车发动机启动时，电源箱4中电源工作供电。线管式等离子反应器3中接有高频高压交流电源的线状中心电极3-1和外层管状电极3-2放电，由于第二绝缘层3-4存在的厚度梯度，两电极间产生梯度电场，在梯度电场的作用下，第一绝缘层3-3和第二绝缘层3-4之间的空腔内迅速产生大量分布均匀的低温等离子体；One: when the automobile engine starts, the power supply in the power supply box 4 works to supply power. The line-shaped central electrode 3-1 and the outer tubular electrode 3-2 connected to the high-frequency high-voltage AC power supply in the line-tube plasma reactor 3 are discharged, and due to the thickness gradient of the second insulating layer 3-4, there is a gap between the two electrodes. Gradient electric field, under the action of the gradient electric field, a large amount of uniformly distributed low-temperature plasma is rapidly generated in the cavity between the first insulating layer 3-3 and the second insulating layer 3-4;
二：发动机运行工作产生的尾气进入排气导管2，经过入口段气体旋流器1旋流处理后，尾气沿排气导管2通道旋转进入线管式等离子反应器3；Two: The exhaust gas generated by the engine operation enters the exhaust duct 2, and after being treated by the gas cyclone 1 in the inlet section, the exhaust gas rotates along the exhaust duct 2 channel and enters the line-tube plasma reactor 3;
三：通过离子化的过程，旋转气流中的悬浮颗粒物(PM)与有害气体被有效分开，其中，有害气体与等离子体中的活性粒子充分反应，迅速降解为无害成分；悬浮颗粒物随旋转气流排出，在尾气导管2的出口出处，经切向旋流槽雾化旋流喷出的尾气处理液与排出的尾气充分混合，悬浮颗粒物被沉降处理，实现了对尾气的二次净化，最终，经二次高效净化的无害气体被排入大气中。Three: Through the process of ionization, the suspended particulate matter (PM) in the swirling airflow is effectively separated from the harmful gas. Among them, the harmful gas fully reacts with the active particles in the plasma and quickly degrades into harmless components; Exhaust, at the outlet of the tail gas conduit 2, the tail gas treatment liquid sprayed out by the tangential swirl tank atomization swirl is fully mixed with the exhausted tail gas, and the suspended particles are settled and treated, realizing the secondary purification of the tail gas. Finally, The harmless gas that has been purified twice is discharged into the atmosphere.
以上所述仅是本发明的优选实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下还可以作出若干改进，这些改进也应视为本发明的保护范围。The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, some improvements can also be made without departing from the principle of the present invention, and these improvements should also be regarded as the invention. protected range.
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