CN216171267U

CN216171267U - Wall-flow type medium barrier discharge purification diesel engine tail gas treatment device

Info

Publication number: CN216171267U
Application number: CN202122713930.XU
Authority: CN
Inventors: 郭秀荣; 杨少池; 杜丹丰
Original assignee: Northeast Forestry University
Current assignee: Northeast Forestry University
Priority date: 2021-11-08
Filing date: 2021-11-08
Publication date: 2022-04-05
Anticipated expiration: 2031-11-08

Abstract

A wall-flow dielectric barrier discharge diesel engine exhaust gas treating device is made of ceramic and has a cylindrical plasma generator casing with many small parallel channels extending axially and alternately opened and closed in adjacent units. The shell is made of iron sheet and is used for grounding. The metal copper bar is used for connecting the high-voltage electrode. The front end cover Teflon and the rear end cover Teflon are used for fixing the copper rod. The tail gas flows into the low-temperature plasma generating device through the gas inlet to generate chemical reaction, a large amount of low-temperature plasma is generated, then the low-temperature plasma reacts with the automobile tail gas, and finally the automobile tail gas is discharged through the gas outlet pipe.

Description

Wall-flow type medium barrier discharge purification diesel engine tail gas treatment device

The technical field is as follows:

the present invention belongs to a diesel engine tail gas Nitrogen Oxide (NO)_X) And a soot Particle (PM) treatment device which is arranged at the rear end of the silencer of the diesel engine close to the tail pipe and is used for treating NO in the tail gas of the diesel engine_XAnd PM.

Background art:

with the rapid development of the industry in China, the automobile industry gradually matures. Compared with gasoline engines, diesel engines are widely used in the automobile industry due to the advantages of sufficient power, high compression ratio, high energy conversion rate, long service life and the like. However, the biggest challenge of diesel engines is the emission problem, so that the tail gas of the diesel engine needs to be treated and then discharged into the atmosphere. The diesel vehicle has the characteristics that the tail gas contains a large amount of nitric oxides, and the current mainstream commercial control method is a selective catalytic reduction technology which has the problems of catalyst poisoning, ammonia gas leakage, narrow working window, high cost and the like. In order to find an efficient, safe and cheap nitrogen oxide removal technology, the tail gas treatment is carried out by a low-temperature plasma technology. The low-temperature plasma has obvious effect of treating the nitrogen oxide, simple structure, high power supply efficiency, uniform discharge and no sound. Therefore, the wall-flow type medium barrier discharge purification diesel engine tail gas treatment device capable of simultaneously purifying NOX and PM is developed.

The utility model has the following contents:

the wall flow type medium blocks the discharge and purifies the diesel engine exhaust processing unit and is made up of five parts: the metal copper bar, iron sheet sleeve shell, front end cover teflon, rear end cover teflon, porous ceramic cylinder. The low-temperature plasma generating device adopts dielectric barrier discharge, ceramic as a medium and an iron sheet sleeve shell as a grounding electrode. The ceramic tube is coaxial with the metal shell. And fixing a copper rod with the diameter of 5mm at the central position of the ceramic tube through a Teflon insulating support frame. The tail gas of the diesel engine enters the low-temperature plasma generating device to generate low-temperature plasma and NO_XPM undergoes a complex oxidation-reduction reaction to produce N₂And CO₂And the like, so as to achieve the purpose of purifying nitrogen oxides and PM.

Description of the drawings:

FIG. 1: assembly cross-sectional view. 1, a metal copper bar; 2 front end cover Teflon; 3, an air inlet; 4, iron sheet sleeve shell; 5 a porous ceramic cylinder; 6, a rear end cover is made of Teflon; 7 air outlet

FIG. 2: cross-sectional view of porous ceramic cylinder

FIG. 3: front end cover Teflon sectional view

The specific implementation mode is as follows:

a wall-flow dielectric barrier discharge diesel engine exhaust gas treating device is made of ceramic to form a cylindrical plasma generator, the cylinder is provided with a plurality of small parallel channels extending along the axial direction, and adjacent units of the channels are alternately opened and closed. The shell is made of iron sheet and is used for grounding. The metal copper bar is used for connecting the high-voltage electrode. The front end cover Teflon and the rear end cover Teflon are used for fixing the copper rod.

The high-voltage electrode of the wall-flow dielectric barrier discharge diesel engine tail gas purification device is a copper rod with the diameter of 5mm, the copper rod is inserted into the tail end teflon to be coaxially matched at first, then the tail end teflon is matched with the ceramic dielectric body, and the outer diameter of the ceramic dielectric body is the same as the inner diameter of the tail end teflon. Then, an iron sheet sleeve shell is matched with the porous ceramic cylinder, the iron sheet sleeve shell is grounded, and the inner diameter of the iron sheet sleeve shell is the same as the outer diameter of the porous ceramic cylinder. And finally, connecting the front end of the Teflon with the ceramic dielectric body.

The tail gas flows into the low-temperature plasma generating device through the gas inlet to generate chemical reaction, a large amount of low-temperature plasma is generated, then the low-temperature plasma reacts with the automobile tail gas, and finally the automobile tail gas is discharged through the gas outlet pipe. The NO in the diesel engine tail gas is treated by the wall-flow type medium barrier discharge purification diesel engine tail gas treatment device_XAnd the PM content is greatly reduced.

Claims

1. Wall-flow dielectric barrier discharge diesel engine tail gas processing unit of purification, its characteristic is to use the ceramic to make the cylindrical plasma generator, there are many small parallel channels extending axially on the cylindrical cross section, the adjacent unit of these channels is opened and stopped up alternatively, make the outer cover with the iron sheet, used for earthing, the metal copper bar is used for connecting the high-voltage electrode, there are circular through holes in the centre of the front end cap teflon, there are circular small grooves in the centre of the bottom in the teflon of the back end cap, the small groove on the through hole and back end cap on the front end cap are used for fixing the copper bar, the front and back end cap has the recess with ceramic cylinder interference fit, there are through holes cooperating with copper bar in the centre of the cylindrical ceramic, the teflon of the front end cap has air inlets, the teflon of the back end cap has air outlets.

2. A wall-flow dielectric barrier discharge diesel engine exhaust gas treatment device according to claim 1, wherein the ceramic is a porous ceramic having a plurality of uniformly controllable pores.