CN210889074U

CN210889074U - Low-temperature plasma and wood fiber cooperated tail gas treatment device

Info

Publication number: CN210889074U
Application number: CN201921004068.1U
Authority: CN
Inventors: 郭秀荣; 杨季彪; 徐岳峰; 杨潇; 何庆合; 杜丹丰
Original assignee: Northeast Forestry University
Current assignee: Northeast Forestry University
Priority date: 2019-07-01
Filing date: 2019-07-01
Publication date: 2020-06-30
Anticipated expiration: 2029-07-01

Abstract

The utility model relates to a low temperature plasma cooperates wood fiber tail gas processing apparatus, it is the device that combines plasma generating device and wood fiber filter core together, the filter body is packed by wood fiber and constitutes wood fiber filter core between outer tube and center tube, plasma generating device adopts the dielectric barrier discharge technique, the filter chamber shell is bonded, the inner wall of filter chamber is hugged closely to cylindric quartz glass pipe, the inside screw high voltage electrode that is of glass pipe; the whole device is arranged in a region with lower temperature of an exhaust system; the exhaust gas of the diesel engine flows into the outer side of the outer cylinder through the flow guide sleeve, then flows into the inner part from the outer surface of the outer cylinder, and flows out of the gas outlet through the central pipe; when the exhaust gas of the diesel engine flows through the device, nitrogen oxides are removed by the plasma, and the wood fiber filter element filters particulate matters, so that purification is realized.

Description

Low-temperature plasma and wood fiber cooperated 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 improvement of living standard of people, the automobile keeping quantity of China is rapidly improved compared with the prior art, wherein the automobile taking a diesel engine as power is favored by people due to the advantages of enough power, high compression ratio, high energy conversion rate, long service life and the like. From the environmental point of view, diesel engine automobiles have greater environmental pollution than other powered automobiles, and in order to meet the national emission standards, the exhaust gas generated by the diesel engine needs to be properly treated and then discharged into the atmosphere. At present, the purification mode of automobile exhaust mainly adopts a mode of filling a catalyst with cordierite honeycomb ceramics, but the cost is high, and the structural process is complex, so people need a mode with simple structure and low cost to replace the catalyst.

The low-temperature plasma synergistic wood fiber technology has the advantages of low energy consumption, NO byproduct, simple and reliable structural design, low exhaust back pressure, strong PM adsorption capacity and certain NO purification_XThe function of the compound, and the like. The purifying device is a brand new purifying device which is designed by utilizing the purifying mechanism of the technology.

The invention content is as follows:

the low-temperature plasma and wood fiber tail gas treatment device is designed by integrating a low-temperature plasma generating device and a filter element. The plasma generating device adopts dielectric barrier discharge, the outer shell of the filter chamber is bonded, the cylindrical quartz glass tube is tightly attached to the inner wall of the filter chamber, and the inside of the glass tube is provided with a high-voltage electrode. The high-voltage electrode is composed of four rows of screws connected to an outer cylinder 14, a central tube 11 is coaxially arranged in the inner cavity of the outer cylinder, a gap between the outer cylinder and the central tube is filled with wood fiber, the upper and lower ports of the outer cylinder are respectively connected with a lower end cover 12 and an upper sealing ring 15, and the interfaces are sealed. The tail gas of the diesel engine enters the low-temperature plasma generating device under the action of the flow guide sleeve, and NO in the tail gas_XPM and generated low-temperature plasmaOxidation-reduction of the hetero compound to form N₂And CO₂The harmless gas is discharged through the holes of the wood fiber central pipe under the action of air pressure, thereby filtering NO_XAnd purpose of PM.

Description of the drawings:

FIG. 1: the low-temperature plasma cooperates with the external structure of the wood fiber tail gas treatment device. The device comprises an upper shell 1, an upper retainer ring 2, sealing rubber 3, a quartz tube 4, a flange 5, a supporting block 6, a lower retainer ring 7, an insulating plug 8, a lower shell 9 and a flow guide cover 10.

FIG. 2: the internal structure of the low-temperature plasma and wood fiber tail gas treatment device is cooperated. 11 central tube, 12 lower sealing cover, 13 screw, 14 outer cylinder and 15 sealing ring.

The specific implementation mode is as follows:

the low-temperature plasma and wood fiber tail gas treatment device combines a low-temperature plasma generating device and a filter element together. The low-temperature plasma generating device comprises a central tube 11 and an outer tube with synapses 13, wherein 10 small holes with the diameter of 2mm are drilled in the circumferential direction of the central tube around the tube wall, 6 groups of small holes are drilled in the circumferential direction of the central tube at intervals of 5mm along the axial direction, 30 small holes with the diameter of 4mm are drilled in the circumferential direction of the

outer tube

14, 10 groups of same small holes are drilled in the position of 10mm along the axial direction, four screws 13 are distributed in the outer tube 14 at intervals of 90 degrees along the center of the tube, and 18 groups of screws which are distributed in the same way are arranged in the longitudinal direction at intervals of 8 mm. Welding a lower sealing cover 12 with the thickness of 2mm and the diameter of 120mm with a central tube 11 together, welding the sealing cover to the bottom of an outer tube, sealing the welding part by using a sealant, uniformly filling long wood fibers with the thickness of 0.05-1mm, the width of 1-2mm and the length of 30-50mm into a gap between the outer tube and the central tube, welding a sealing ring 15 with the thickness of 2mm and the outer diameter and the inner diameter of 120mm and 40mm with the central tube to the top of an outer tube 14, welding the inner side of an upper sealing cover 15 to the central tube 11, and sealing the welding part by using the sealant.

The upper shell 1 and the lower shell 9 are both cylindrical, the upper retainer ring 2 and the lower retainer ring 7 are welded at the middle positions of the inner walls of the upper shell and the lower shell, and the two retainer rings are parallel and coaxial to be used for fixing the annular quartz glass tube during welding. Placing stone in the metal support frameThe quartz glass tube 4 is placed into the insulating supporting block 6, then the filter body is placed on the supporting block, the top of the upper shell 1 is placed into the sealing rubber 3 and then is connected with the lower shell 9 through the flange 5, tail gas flows into the low-temperature plasma generating device through the air inlet pipe, and chemically reacts with the generated low-temperature plasma in the filter body, and finally the tail gas is discharged from the central pipe. NO in the diesel engine tail gas is treated by the low-temperature plasma and the wood fiber tail gas treatment device_XAnd the PM content can be greatly reduced.

Claims

1. Low temperature plasma is wood fibre tail gas processing apparatus in coordination, its characterized in that: the low-temperature plasma generating device and the filter element are integrally designed; the plasma generating device adopts dielectric barrier discharge, the outer shell of the filter chamber is bonded, the cylindrical quartz glass tube is tightly attached to the inner wall of the filter chamber, and the inside of the glass tube is provided with a high-voltage electrode.

2. The low-temperature plasma and wood fiber synergistic tail gas treatment device according to claim 1, wherein the high-voltage electrode is formed by four rows of screws connected to an outer cylinder, a central tube is coaxially arranged in an inner cavity of the outer cylinder, a gap part between the outer cylinder and the central tube is filled with wood fibers, an upper port and a lower port of the outer cylinder are respectively connected with a lower end cover and an upper sealing ring, and joints are sealed.