CN110735691B

CN110735691B - A plasma-based vehicle exhaust purification equipment

Info

Publication number: CN110735691B
Application number: CN201911106101.6A
Authority: CN
Inventors: 李雪爱; 李越; 唐慧敏; 董文琪
Original assignee: Yanshan University
Current assignee: Yanshan University
Priority date: 2019-11-13
Filing date: 2019-11-13
Publication date: 2021-07-30
Anticipated expiration: 2039-11-13
Also published as: CN110735691A

Abstract

The invention discloses a plasma-based automobile exhaust gas purification equipment, which relates to the technical field of automobile environmental protection. A generating bag and a lower plasma generating bag, an upper moving link hinged on the upper plasma generating bag, and a lower moving connecting rod hinged on the lower plasma generating bag, the upper plasma generating bag and the lower plasma generating bag are provided with cathode and anode. The invention realizes continuous reaction, improves purification efficiency, reduces energy consumption, reduces equipment volume, increases gas flow, continuously creates low pressure conditions, and makes the reaction more sufficient.

Description

Automobile exhaust purifying equipment based on plasma

Technical Field

The invention relates to the technical field of automobile environmental protection, in particular to automobile exhaust purification equipment based on plasma.

Background

The existing automobile exhaust mainly adopts a catalytic conversion method, and researchers seek a more efficient exhaust treatment scheme due to the defects of poisoning and inactivation of a catalyst, narrow effective working window parameters and the like. At present, tail gas purification products mainly comprise three-way catalysts: the purifying agent in the three-way catalyst can enhance the activity of three gases of CO, HC and NOx to promote the three gases to carry out certain oxidation-reduction chemical reaction; however, the existing exhaust gas purification products have the following defects: (1) the PM2.5 particles are not crushed and decomposed; (2) the particles and carbon are condensed on the surface of the purifying agent in a short time to cause purification failure; (3) the cleaning and maintenance are very troublesome and frequent, and the effective period of the catalyst is short. The existing various tail gas purifiers also have the defects, and the concept of real environmental protection cannot be realized. The plasma has strong oxidizing property, can effectively remove sulfur dioxide in automobile exhaust, and can oxidize particulate matters, thereby having higher application value. The plasma technology needs a high-voltage power supply, and the application of the plasma technology in automobile exhaust treatment is limited by the characteristics of difficult discharge under atmospheric pressure, and the like, so that the plasma technology is a new exhaust treatment technology. However, the reaction needs a certain time, the exhaust speed of the automobile exhaust is high, and particularly when the real-time treatment effect is to be achieved, the retention time of the exhaust components in the purifier is short, the treatment capacity of the plasma on macromolecules is reduced, and the effect of removing macromolecular carbon particles in the exhaust is poor.

Disclosure of Invention

The invention aims to provide a method for solving the technical problem. The continuous reaction improves the purification efficiency, reduces the energy consumption, reduces the volume of equipment, increases the flow of gas, and continuously creates a low-pressure condition, so that the reaction is more sufficient.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows:

the plasma-based automobile exhaust purification equipment comprises an exhaust passage, an upper plasma generation bag and a lower plasma generation bag which are communicated with the inside of the exhaust passage and are made of flexible materials and are arranged on the side wall of an exhaust pipeline, an upper movement connecting rod hinged on the upper plasma generation bag and a lower movement connecting rod hinged on the lower plasma generation bag, wherein cathodes and anodes are arranged in the upper plasma generation bag and the lower plasma generation bag.

The technical scheme of the invention is further improved as follows:

due to the adoption of the technical scheme, the invention has the technical progress that:

the invention utilizes the high-speed airflow of the automobile exhaust to form a low-pressure environment, thereby discharging under low pressure, leading the generated plasma and strong oxide substances into the smoke channel, realizing the purpose of purifying pollutants, realizing continuous reaction by the alternate work of the two plasma generating bags, improving the purification efficiency, reducing the energy consumption and reducing the equipment volume.

The movable flexible material bag-shaped plasma generating device increases the flowing of gas, continuously creates a low-pressure condition, increases the amount of plasma, makes the reaction more sufficient, and improves the purification efficiency.

The upper plasma generating bag and the lower plasma generating bag are arranged in a row and are arranged oppositely, so that the number of times of plasma entering the exhaust channel and the number of the plasma are increased, the gas convection effect is increased, the gas can react with the plasma generated by the upper plasma generating bag and the lower plasma generating bag for many times, the reaction time is shortened, and the purification efficiency is increased. The openings of the upper plasma generating bag and the lower plasma generating bag in the exhaust channel are arranged in a staggered mode, so that the gas in the upper plasma generating bag and the plasma in the lower plasma generating bag flow in sequence, reaction imbalance in the exhaust channel is prevented, the process of purification reaction is controlled favorably, and equipment damage caused by unstable air pressure in the upper plasma generating bag and the lower plasma generating bag is prevented.

The inner structure of the upper plasma generating bag and the lower plasma generating bag ensures that the discharge at low pressure and the pollutant purification process are stably carried out after the generated plasma and strong oxide are introduced into the flue gas channel, the equipment structure is simplified, the equipment is firmer, and the service life is prolonged.

Drawings

FIG. 1 is a schematic front view of the present invention;

FIG. 2 is a schematic side view of the present invention;

FIG. 3 is a schematic cross-sectional view of a plasma-generating bladder;

FIG. 4 is a schematic side cross-sectional view of the upper plasma generating bladder;

FIG. 5 is a rear view of the upper plasma generating bladder;

FIG. 6 is another schematic front view of the present invention;

the device comprises a gas exhaust channel 1, an upper plasma generating bag 2-1, a shell 2-2, a cathode 2-3, a medium layer 2-4, an anode 2-5, a flexible sealing bag 3, an upper moving connecting rod 4, a lower plasma generating bag 5, a lower moving connecting rod 6, an anode screw 7 and a cathode screw.

Detailed Description

The present invention will be described in further detail with reference to the following examples:

as shown in fig. 1 to 6, a plasma-based automobile exhaust gas purifying apparatus includes an exhaust passage 1, an upper plasma generating bag 2, a lower plasma generating bag 4, a moving link 3, and a lower moving link 5. The upper plasma generating bag 2 and the lower plasma generating bag 4 are made of flexible materials, the upper surface of the exhaust channel 1 is communicated with the upper plasma generating bag 2, the lower surface of the exhaust channel 1 is communicated with the lower plasma generating bag 4, the upper moving connecting rod 3 is hinged on the upper plasma generating bag 2, and the lower moving connecting rod 5 is hinged on the lower plasma generating bag 4.

The flexible closed bags 2-5 are arranged obliquely, and the inclination directions of the flexible closed bags 2-5 of the upper plasma generating bag 2 and the lower plasma generating bag 4 are opposite. The upper plasma generating bags 2 and the lower plasma generating bags 4 are uniformly arranged in a plurality, the upper plasma generating bags 2 are arranged in a row, the lower plasma generating bags 4 are arranged in a row, the rows where the upper plasma generating bags 2 and the lower plasma generating bags 4 are arranged oppositely, and the two rows are respectively positioned at the uppermost part and the lowermost part of the exhaust channel 1. The openings of the upper plasma generating bags 2 are communicated with the exhaust channel 1 downwards, the openings of the lower plasma generating bags 4 are communicated with the exhaust channel 1 upwards, and the openings of the upper plasma generating bags 2 and the lower plasma generating bags 4 in the exhaust channel 1 are arranged in a staggered mode.

The plasma generating bag 2 comprises a cathode 2-2, an anode 2-4, a shell 2-1, a dielectric layer 2-3 and a flexible closed bag 2-5. The flexible closed bag 2-5 is fixedly connected with the exhaust channel 1, the shell 2-1 is fixedly connected with one end of the top of the upper plasma generating bag 2, the lower part of the shell 2-1 is fixedly connected with the upper part of the flexible closed bag 2-5, the anode 2-4 is fixedly connected with an anode screw 6, the cathode 2-2 is fixedly connected with a cathode screw 7, the cathode 2-2 is arranged on the inner layer of the shell 2-1, the surface of the anode 2-4 is provided with a medium layer 2-3, the flexible closed bag 2-5 wraps the whole cathode 2-2, the anode 2-4 and the medium layer 2-3, the anode screw 6 and the cathode screw 7 penetrate through the shell 2-1 to be fixedly connected with the upper movement connecting rod 3, and the junction is provided with an anti-creeping device. The upper plasma generating capsule 2 and the lower plasma generating capsule 4 are both flat shells with a cross section of a balloon shape.

The lower plasma generating bag 4 has the same structure as the upper plasma generating bag 2, and is different in that a shell 2-1 is fixedly connected with one end of the bottom of the lower plasma generating bag 4, and an anode screw 6 and a cathode screw 7 are fixedly connected with a lower motion connecting rod 5 through the shell 2-1.

The dielectric layer 2-3 is made of insulating materials, the cathode 2-2 and the anode 2-4 are made of conductive materials, and the flexible sealing bag 2-5 is made of flexible insulating materials.

The shell 2-1 is a spherical shell, the anode 2-4 is a cylindrical short rod, the thickness of the anode 2-4 is equal to that of the upper plasma generating bag 2 and the lower plasma generating bag 4, and the dielectric layer 2-3 is arranged between the anode 2-4 and the cathode 2-2.

Working principle or using method:

as shown in figure 1, the lower plasma generating bag 4 and the upper plasma generating bag 2 have the same inclination angle and opposite inclination directions, when smoke enters the exhaust channel 1 from the left side, the smoke moves rightwards at a high speed, and due to the fact that gas of the plasma generating bag 4 enters the channel under the action of the gas pressure, low gas pressure is formed in the lower plasma generating bag 4, and due to the fact that the low gas pressure is beneficial to the initiation of plasma discharge, after the gas pressure is reduced to a certain degree, discharge is conducted between a cathode and an anode, and plasma is formed.

In the working process of the device, the upper motion connecting rod 3 and the lower motion connecting rod 5 move left and right under the action of the electrode device. When the equipment runs to the state shown in fig. 6, the inclination angles of the lower plasma generating bag 4 and the upper plasma generating bag 2 are consistent, the inclination directions are opposite, the flue gas enters the lower plasma generating bag 4, is mixed with the plasma and then enters the channel, and the purification of the flue gas is realized in the process; meanwhile, the gas in the upper plasma generating bag 2 enters the channel to form a low-pressure environment and discharges to generate plasma; further along with the movement of the upper movement link 3 and the lower movement link 5, when the links are moved again to the state of fig. 6, the upper plasma generating capsules 2 are purified and the inside of the lower plasma generating capsules 4 starts to discharge. The two plasma generating bags work alternately so as to realize the purification of the flue gas.

Claims

1. A plasma-based automobile exhaust gas purification device, characterized in that: it comprises an exhaust passage (1), an opposite flexible device that is communicated with the interior of the exhaust passage (1) and is arranged on the side wall of the exhaust pipe (1). The upper plasma generation capsule (2) and the lower plasma generation capsule (4) made of material, the upper moving link (3) hinged on the upper plasma generation capsule (2), and the lower plasma generation capsule (4) hinged The lower moving connecting rod (5) of the upper plasma generating capsule (2) and the lower plasma generating capsule (4) are provided with a cathode (2-2) and an anode (2-4); the upper plasma generating capsule (2) ) and the lower plasma generation capsules (4) are evenly arranged in a plurality of rows and arranged in a row, and the upper plasma generation capsules (2) and the lower plasma generation capsules (4) are located in opposite rows and columns; the upper plasma generation capsules ( 2) The structure is the same as that of the lower plasma generating bag (4), and both include a casing (2-1) and a flexible sealing bag (2-5) that is fixedly connected to the casing (2-1) and the exhaust passage (1). (2-1) A cathode (2-2) is arranged on the inner wall, an anode (2-4) is arranged in the center of the outer shell (2-1), and a dielectric layer (2-3) is surrounded by the anode (2-4). Between (2-3) and the cathode (2-2) is provided a semi-annular channel communicating with the flexible closed bag (2-5), the anode (2-4) is connected with the anode screw (6), the cathode (2-2) is fixedly connected with the cathode screw (7), the anode screw (6) and the cathode screw (7) are fixedly connected with the upper moving link (3) through the casing (2-1); the upper moving link (3) ) and the lower moving link (5) move left and right under the action of the electrode equipment; the lower plasma generating bag (4) and the upper plasma generating bag (2) have the same inclination angle and opposite directions, and the flue gas enters the lower plasma generating bag (2). The plasma generating capsule (4) enters the channel after mixing with the plasma, and realizes purification of the flue gas in the process; meanwhile, the gas in the upper plasma generating capsule (2) enters the channel to form a low-pressure environment and discharges to generate plasma further with the movement of the upper moving link (3) and the lower moving link (5), the upper plasma generating capsule (2) is purified, and the inner part of the lower plasma generating capsule (4) starts to discharge; the two plasmas The sacs work alternately to achieve the purification of the flue gas.

2 . The plasma-based vehicle exhaust gas purification device according to claim 1 , wherein the upper plasma generating bag ( 2 ) and the lower plasma generating bag ( 4 ) are arranged in the exhaust passage ( 1 ). 3 . The openings are staggered.

3. A plasma-based vehicle exhaust gas purification device according to claim 1, characterized in that: the dielectric layer (2-3) is an insulating material, and the cathode (2-2) and the anode (2-4) are conductive Material, the flexible closure bag (2-5) is a flexible insulating material.

4 . The plasma-based vehicle exhaust gas purification equipment according to claim 1 , wherein the upper plasma generating capsule ( 2 ) and the lower plasma generating capsule ( 4 ) are both flat and balloon-shaped in cross-section. 5 . The casing, the anode (2-4) is a short cylindrical rod, and the dielectric layer (2-3) is arranged between the anode (2-4) and the cathode (2-2).

5 . The plasma-based vehicle exhaust gas purification device according to claim 1 , wherein the upper moving link ( 3 ) and the lower moving link ( 5 ) are arranged horizontally. 6 .