CN214416363U

CN214416363U - Plasma reactor for treating gaseous medium

Info

Publication number: CN214416363U
Application number: CN202022573550.6U
Authority: CN
Inventors: 不公告发明人
Original assignee: Chongqing Duoarc Technology Co ltd
Current assignee: Chongqing Duoarc Technology Co ltd
Priority date: 2020-11-10
Filing date: 2020-11-10
Publication date: 2021-10-19
Anticipated expiration: 2030-11-10

Abstract

The utility model discloses a plasma reactor for treating gaseous media, which comprises at least one pair of electrodes; a dielectric barrier layer disposed between the pair of electrodes; and a gas flow path through which at least one gaseous medium of the electrode and dielectric barrier may pass. The utility model discloses convenient operation opens promptly and uses, and the running cost is low, and application scope is extensive.

Description

Plasma reactor for treating gaseous medium

Technical Field

The utility model relates to a plasma reactor for handling gaseous state medium relates to plasma reactor technical field.

Background

In recent years, due to the rapid development of economy in China, the holding capacity of urban motor vehicles is rapidly increased, large and medium cities are continuously expanded, traffic jam is aggravated, and air pollution is serious. The statistical data show that: by 2009, the nationwide motor vehicle holding capacity is close to 1.7 hundred million vehicles, the year by year is increased by 9.3%, and compared with 1980, the nationwide motor vehicle holding capacity is increased by 25 times. With the rapid increase of the motor vehicle reserves, the pollution of motor vehicle exhaust gas to cities in China will rise, and the city image and the health of residents can be influenced. In addition, with the increasing activity of economic communication in various regions, the number of urban transit vehicles is greatly increased, and the air pollution of transit cities is invisibly aggravated. The total amount of automobiles is rapidly increased, the increase is relatively concentrated in big cities, and because of the characteristics, the automobile pollution is caused in many places in China, particularly in big citiesThe dyeing problem is increasingly prominent. Exhaust gases from motor vehicles, except for nitrogen and oxygen in the air and the combustion products CO₂The water vapor is a harmless component, and the rest is harmful substances. In the exhaust gas discharged from the engine of the motor vehicle, a part of toxic substances are generated due to incomplete combustion of fuel or low temperature of fuel gas; another part of the toxic substances are nitrogen oxides and lead compounds formed due to high temperature and high pressure in the combustion chamber.

Increasingly stringent emission control regulations are forcing internal combustion engine and vehicle manufacturers to find more effective ways to remove these harmful exhaust emissions from internal combustion engines. Various systems for capturing particulate matter emissions from the exhaust of internal combustion engines have been investigated. In such systems, particulate matter is removed from diesel exhaust by simply and physically trapping it in the interstices of a porous ceramic filter body, and the remaining diesel exhaust is then burned off by heating the filter body to a temperature of 100 ℃. Precipitation of charged particulate matter by electrostatic forces is also currently common practice. However, a problem with this type of plasma reactor is that in the case of gases containing particulate matter such as soot, the actual proportion of the residence time of the gases in the plasma reactor is insufficient to complete the plasma-assisted oxidation of the particulate matter. Thus, the apparatus requires the trapping of particulate material, which can be done by introducing a packed bed of particles into the gas flow space, which acts as a filter for trapping particulate matter. However, in this region, the electric field is not sufficient to cause a plasma to be established in the gaseous medium flowing through the region. In addition, deposition tends to concentrate in the gas entry region.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention aims to overcome the above-mentioned drawbacks of the prior art and to provide a plasma reactor for treating a gaseous medium.

According to the present invention, there is provided a plasma reactor for treating a gaseous medium, the plasma reactor comprising at least one pair of electrodes; an intermediate dielectric barrier layer is arranged between the pair of electrodes; and a gas flow path through which at least one gaseous medium of the electrode and dielectric barrier may pass. In use, by applying a suitable electrical potential across the or each electrode pair, material between the plasma discharge electrodes is generated in the gaseous medium, which layer may comprise or be separable from the dielectric barrier layer, and provides a surface over which the gaseous medium flows, the surface extending along at least part of the length of the gas flow path, means for trapping a selected species or particulate matter on the surface in the gaseous medium.

In accordance with the invention, the device includes a source of direct current, alternating current or pulsed voltage applied to electrostatically trap the surface particulate matter in the gaseous medium. In order to perform electrostatic trapping in this manner, it may be necessary to pre-charge the particulate matter by exposing the particulate matter-carrying gaseous medium to an electric field.

Preferably, the layer of material is provided by a permeable filter material in the form of a sheet and the gas flow path is such that the gaseous medium is directed to flow through the sheet of filter material, thereby trapping the selected substance or particulate material in the gaseous medium on its surface. One or both sides of the material layer may be provided with a coating. The coating may be a catalyst for removing nitrogen oxides or carbonaceous materials. The catalyst on one surface may catalyze one reaction (e.g., reduction of nitrogen oxides) while the catalyst on the other surface may catalyze another, different reaction (e.g., oxidation of carbonaceous materials), or one or more coatings may comprise a mixture of catalysts.

When the plasma reactor is in use, a power supply is connected to apply a high voltage alternating current, a pulsed current, a direct current or a combination of these potentials to the electrodes to generate a plasma in the gaseous medium between the electrodes to act on the surfaces to assist in oxidising particulate matter trapped thereon or to promote reactions including catalytic reactions of trapped selected species. Catalytic material may be present in the plasma region to assist in the removal of nitrous oxide and carbonaceous material. For alternating current, a triangular wave, a sine wave, a square wave, a sawtooth wave having the same or similar characteristics may be used alone or in combination.

Drawings

Embodiments of the invention are explained in more detail below with the aid of the figures.

Fig. 1 is a schematic cross-sectional view of a plasma reactor for treating a gaseous medium according to the present invention.

Reference numerals

Plasma reactor 1, ceramic plate 2, ceramic plate 3, electrode plate 4, electrode plate 5, electrode plate 6, electrode plate 7, extension 8, extension 9, extension 10, extension 11, ceramic plate 12, ceramic plate 13, ceramic plate 14, ceramic plate 15, ceramic plate 16, ceramic plate 17, ceramic pad 18, opening 19.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and the described embodiments are only some embodiments, not all embodiments, of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in fig. 1, the plasma reactor 1 includes a rectangular box-shaped housing formed between a ceramic plate 2 and a ceramic plate 3. In the plasma reactor 1, four electrode plates 4, 5, 6 and 7, as well as an

extension

8, 9, 10, 11 are mounted to provide electrical contact. Electrode plates 4, 6 are mounted on one side of the plasma reactor 1, while electrode plates 5, 7 are on the other side of the plasma reactor 1.

Electrode plate 4, electrode plate 5, electrode plate 6 and electrode plate 7 are fixed in the middle by ceramic plates 2 and 12,

ceramic plates

13 and 14,

ceramic plates

15 and 16, and ceramic plates 17 and 3. If the edges of the electrode plates are closer to the edges of the ceramic plates, the space between the individual ceramic plates will be filled with ceramic adhesive. The ceramic plate serves as a dielectric barrier for the electrode plates associated therewith. Alumina is a suitable material for the ceramic dielectric barrier material, and aluminum nitride may also be used. The dielectric barrier material may be a catalytic material or comprise a catalytic coating in or on its surface.

Ceramic spacers 18 for supporting the electrode plates apart and forming the side walls of the rectangular box housing. One opening 19 is provided at each end of the plasma reactor 1. The permeable filter may be of different shapes in order to optimise the trapping of particulate material. It may be an indentation in the form of a square wave. Particles entrained in the gas stream are trapped on the layer of filter material and are oxidized by the plasma. The filter material may be a material selected for capture from a gaseous medium.

It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications can be made without departing from the scope of the invention.

Claims

1. A plasma reactor for treating a gaseous medium, comprising a ceramic plate, an electrode plate, an extension, a ceramic spacer, an opening; wherein a rectangular box-shaped shell is formed between the ceramic plates; four electrode plates are arranged in the shell, and the extension part is used for providing electric contact; four electrode plates are respectively arranged at two sides of the plasma reactor.

2. A plasma reactor for treating a gaseous medium according to claim 1, wherein the plasma reactor comprises at least one pair of electrodes between which a dielectric barrier is mounted.

3. A plasma reactor for treating a gaseous medium according to claim 2, wherein at least one gas flow path is present in the dielectric barrier through which the gaseous medium can pass.

4. A plasma reactor for treating a gaseous medium according to claim 1, characterized in that the plasma reactor comprises a direct current, alternating current or pulsed voltage source applied to electrostatically trap surface particulate matter in the gaseous medium.

5. A plasma reactor for treating a gaseous medium according to claim 2, wherein each of said dielectric barriers is in intimate contact with said electrode.