CN209781006U - Integrated automobile exhaust purification device based on dielectric barrier discharge - Google Patents
Integrated automobile exhaust purification device based on dielectric barrier discharge Download PDFInfo
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- CN209781006U CN209781006U CN201920503955.7U CN201920503955U CN209781006U CN 209781006 U CN209781006 U CN 209781006U CN 201920503955 U CN201920503955 U CN 201920503955U CN 209781006 U CN209781006 U CN 209781006U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
Abstract
The utility model discloses an integrated automobile exhaust purification device based on dielectric barrier discharge, which comprises a DBD exhaust pipe, a tubular connector, a power converter, a vehicle-mounted power supply regulator and a smoke concentration measuring device; the DBD exhaust pipe comprises an outer tubular metal electrode, a central rod-shaped metal electrode, a central insulating sleeve and two groups of herringbone supporting frames; tubular connectionThe head is respectively connected with the tail gas pipe of the automobile and the outer tubular metal electrode; the central rod-shaped metal electrode is connected with a transformer through a lead, and the transformer and the vehicle-mounted power supply regulator are both connected with a vehicle-mounted storage battery; the central insulating sleeve is connected with the tubular connector and the outer tubular metal electrode through the inverted V-shaped support frame; each group of the herringbone support frames comprises three cylindrical support rods. The utility model discloses on the basis that does not influence the inside structure of itself of automobile engine to change as the target to the car minimum, effectively get rid of the NO among the automobile exhaustXCO, HC and other main pollutants, and is powered by a vehicle-mounted storage battery.
Description
Technical Field
The utility model relates to an automobile exhaust purifies technical field, especially an integration automobile exhaust purifier based on dielectric barrier discharges.
Background
With the rapid development of the automobile industry in China, the automobile holding capacity is increased rapidly, the influence of automobile exhaust on the urban air quality begins to be prominent, and although the appearance of the electric automobile is expected to deal with the problem of exhaust pollution to a certain extent, the electric automobile is limited by the battery technology and the charging problem, the endurance mileage of the electric automobile is not high, the charging problem is particularly prominent in the non-urban areas, and the manufacture and the abandonment of the lithium battery bring serious environmental pollution. Therefore, the problem of exhaust pollution of conventional fuel-oil automobiles is still urgently solved.
The main pollutant of the automobile exhaust is NOXCO, HC, etc., there are two major current methods for purifying automobile exhaust as follows:
1. The three-way catalyst is adopted, and the purifying agent in the three-way catalyst promotes the pollutants to have oxidation-reduction chemical reaction. However, this method is subject to the conditions of catalyst activity and heating, which is energy consuming and liable to cause auto-ignition, and has a very limited catalyst life.
2. The method of filtering automobile exhaust by water washing is also widely researched, but the method is only effective for carbon particles and has higher requirement on the volume of a water tank.
With the development of the non-equilibrium plasma-assisted combustion technology, the non-equilibrium plasma-assisted combustion technology has demonstrated unusual capabilities in improving combustion efficiency, shortening ignition delay and stabilizing flame. Plasmas are divided into equilibrium plasmas and non-equilibrium plasmas, wherein the plasmas generated by arc discharge belong to the equilibrium plasmas and are often used for engine ignition. However, the erosion of the electrode during the generation of the equilibrium plasma by the discharge is so severe that it is generally difficult to maintain for a long time. Typical nonequilibrium generating modes mainly include dielectric barrier discharge, nanosecond pulse discharge, microwave discharge and the like, and in the discharging modes, a nanosecond pulse discharge power supply system is complex and large in size and has the problems of strong electromagnetic interference and the like; plasma generated by microwave discharge may cause damage to human body, and is not suitable for vehicle-mounted use.
The patent application of the chinese utility model with publication number CN102230410A is entitled "a device for purifying automobile exhaust based on plasma to realize photocatalysis", which uses titanium dioxide, and once the substance leaks, it is difficult to be discharged for a long time when being inhaled by human body.
The chinese utility model patent application with publication number CN103352744, its utility model is named as "a plasma purifier for automobile exhaust", the structure is complicated, there are extra water tanks, power supplies, the middle box body exists and is unfavorable for overall arrangement on the current car, has influenced automobile engine design.
The chinese utility model patent application with publication number CN109351140A, its new name of utility is "a thermal plasma exhaust treatment device", wherein, the plasma that discharges and produce belongs to thermal plasma, and electrode working life is short, and needs refractory material protection, and the processing degree of difficulty of reducing section is high.
SUMMERY OF THE UTILITY MODEL
the to-be-solved technical problem of the utility model is not enough to above-mentioned prior art, and provide an integration automobile exhaust purifier based on dielectric barrier discharge, this integration automobile exhaust purifier based on dielectric barrier discharge is on the basis that does not influence the inside structure itself of automobile engine to the car minimum change be the target, effectively get rid of the NO among the automobile exhaustXCO, HC and other main pollutants, and is powered by a vehicle-mounted storage battery.
In order to solve the technical problem, the utility model discloses a technical scheme is:
An integrated automobile exhaust purification device based on dielectric barrier discharge comprises a DBD exhaust pipe, a tubular connector, a power converter, a vehicle-mounted power supply regulator and a smoke concentration measuring device.
The DBD exhaust pipe comprises an outer tubular metal electrode, a central rod-shaped metal electrode, a central insulating sleeve and two groups of herringbone supporting frames.
The tubular connector comprises a middle section and connecting ends positioned at two ends of the middle section, wherein one connecting end is connected with the automobile exhaust pipe, and the other connecting end is connected with the outer tubular metal electrode.
The periphery of the central rod-shaped metal electrode is coated with a central insulating sleeve, and the central rod-shaped metal electrode coated with the central insulating sleeve is coaxially inserted in the outer tubular metal electrode.
The central rod-shaped metal electrode is connected with a transformer through a lead, and the transformer and the vehicle-mounted power supply regulator are both connected with a vehicle-mounted storage battery.
The downstream end of the central insulating sleeve is a closed end which is flush with the downstream end of the outer tubular metal electrode.
The outer wall surface of the central insulating sleeve is connected with the inner wall surface of the middle section of the tubular connector through one group of herringbone supporting frames, and is connected with the inner wall surface of the outer tubular metal electrode through the other group of herringbone supporting frames.
Each group of the herringbone support frames comprises three cylindrical support rods which are uniformly distributed along the circumferential direction.
The annular channel between the central insulating sleeve and the outer tubular metal electrode is an automobile exhaust treatment channel, and the flue gas concentration measuring device is used for measuring the flue gas at the outlet of the automobile exhaust treatment channel.
The inner diameters of the automobile tail gas pipe, the tubular connector and the outer tubular metal electrode are equal.
the outer diameters of the automobile tail gas pipe, the tubular connector and the outer tubular metal electrode are also equal.
two links of tubulose connector are the external screw thread link, and outer tubulose metal electrode includes discharge section and female connection section, and the wall thickness of female connection section is less than the wall thickness of discharge section, and one of them external screw thread link threaded connection of female connection section and tubulose connector, another external screw thread link and automobile exhaust pipe threaded connection.
The length of the discharge section is not more than 10 times of the length of the internal thread connecting section.
Shallow screw threads are processed on the inner wall surface of the discharge section.
The central rod-shaped metal electrode is in threaded connection with the central insulating sleeve.
A threading through hole is formed in one supporting column in a group of inverted V-shaped supporting frames connected with the tubular connectors, an outer threading hole is formed in the tubular connector corresponding to the threading through hole, an inner threading hole is formed in the central insulating sleeve corresponding to the threading through hole, and a lead sequentially penetrates through the outer threading hole, the threading through hole and the inner threading hole and then is connected with the central rod-shaped metal electrode.
The tubular connector, the central insulating sleeve and the support column are all made of ceramic materials.
The utility model discloses following beneficial effect has:
1. The plasma generated based on the dielectric barrier discharge mode to control the automobile exhaust pollutants has the advantages of high response speed, rapid discharge reaction, large parameter adjustable range, long-time operation of the electrode and the like.
2. The automobile exhaust pipe is easy to process, the adopted configuration has good compatibility with an automobile exhaust pipe structure, the modularized design is convenient to disassemble and assemble, the designed central rod-shaped metal electrode and the designed support rod have small obstruction to the inflow of the exhaust, and the support rod can form a shedding vortex and a backflow area, so that the discharge of the exhaust is more sufficient.
3. Can convert NO intoXAnd main pollution gases such as CO and the like are purified into non-toxic and pollution-free gases, carbon black and carbon oxide particles can be adsorbed, the purification effect can be regulated and controlled through a vehicle-mounted power supply regulator, and the discharging power in the discharging mode is usually less than 100W.
4. The automobile exhaust pipe structure is integrated with the original automobile exhaust pipe structure, and no extra space is occupied.
Drawings
fig. 1 shows the overall structure diagram of the integrated automobile exhaust purification device based on dielectric barrier discharge.
Fig. 2 shows a perspective view of a DBD exhaust pipe.
Fig. 3 shows an axial sectional view of the DBD exhaust pipe.
Fig. 4 shows a radial sectional view of the DBD exhaust pipe.
Fig. 5 shows a perspective view of a central rod-shaped metal electrode.
Figure 6 shows a perspective view of the central insulating sleeve.
Fig. 7 shows an axial section through the central insulating sleeve.
Fig. 8 shows a perspective view of the tubular connection head.
Fig. 9 shows an axial section of the tubular connection head.
fig. 10 shows a perspective view of an outer tubular metal electrode.
Fig. 11 shows an axial cross-section of an outer tubular metal electrode.
Figure 12 shows a block diagram of the support pole without the threaded holes.
Figure 13 shows a block diagram of the support pole with threading holes.
FIG. 14 shows a schematic of the recirculation zone formed downstream of the support rods.
Fig. 15 shows a schematic view of the low flow velocity zone formed downstream of the support rods.
FIG. 16 is a schematic diagram showing the arrangement of the sizes of DBD exhaust pipes when the inner diameter of an automobile exhaust pipe is 40 mm.
Among them are:
A DBD exhaust pipe;
11. An outer tubular metal electrode; 111. an internal threaded connection section; 12. a central rod-shaped metal electrode; 13. a central insulating sleeve; 131. an inner threading hole; 14. a support bar; 141. threading through the holes;
20. A tubular connector; 21. an external thread connecting end; 22. a middle section; 221. an outer threading hole;
30. A power converter; 40. a vehicle-mounted storage battery; 41. a vehicle-mounted power regulator;
50. A flue gas concentration measuring device; 51. a measuring probe;
60. A reflux zone; 61. a flow line; 62. a low flow rate zone.
Detailed Description
the present invention will be described in further detail with reference to the accompanying drawings and specific preferred embodiments.
In the description of the present invention, it should be understood that the terms "left side", "right side", "upper part", "lower part" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, "first", "second" and the like do not indicate the degree of importance of the component, and the upstream and downstream are distinguished by the direction of travel of the exhaust gas, and therefore, should not be construed as limiting the present invention. The specific dimensions used in the present embodiment are only for illustrating the technical solution, and do not limit the protection scope of the present invention.
As shown in fig. 1, an integrated automobile exhaust purification device based on dielectric barrier discharge comprises a DBD exhaust pipe 10, a tubular connector 20, a power converter 30, a vehicle-mounted power regulator 41 and a smoke concentration measuring device 50.
As shown in fig. 8 and 9, the tubular connector includes a middle section 22 and connecting ends at two ends of the middle section, and the middle section is preferably provided with an external threading hole 221.
The two connecting ends of the tubular connector are preferably external thread connecting ends 21, the external thread connecting end located at the upstream is in threaded connection with the automobile exhaust pipe, and the external thread connecting end located at the downstream is in threaded connection with the outer tubular metal electrode.
The inner diameter of the tubular connector is preferably equal to the inner diameter of an automobile exhaust pipe, and the outer diameter of the middle section is preferably equal to the outer diameter of the automobile exhaust pipe.
Before the tubular connector is assembled with the automobile exhaust pipe, a section of annular groove with the length equal to that of the upstream external thread connecting end is dug on the inner wall surface of the tail end of an outlet of the automobile exhaust pipe, and then internal threads are turned on the annular groove, so that the tubular connector and the automobile exhaust pipe are well assembled.
The presence of the tubular connector also serves to ensure that the discharge only occurs in the annular channel between the outer tubular metal electrode and the central rod-shaped metal electrode downstream of the tubular connector. Because the tubular connector is made of ceramic, the thread connection section of the tubular connector and the internal thread section has a layer of ceramic insulating medium barrier more than the downstream discharge section, so that the discharge section can preferentially discharge after voltage is applied, and the thread connection section does not discharge.
As shown in fig. 2 to 4, the DBD exhaust pipe includes an outer tubular metal electrode 11, a central rod-shaped metal electrode 12, a central insulating sleeve 13, and two sets of support frames shaped like a Chinese character 'ren'.
As shown in fig. 11 and 12, the outer tubular metal electrode includes a discharge section and an internal thread connection section 111, and the wall thickness of the internal thread connection section is smaller than that of the discharge section, and the specific operation method is as follows: the method comprises the steps of firstly excavating a section of annular groove with the length equal to that of the internal thread connecting section on the inner wall surface of the upstream end of the outer tubular metal electrode, and then turning internal threads on the annular groove to form the internal thread connecting section, so that the inner diameter and the outer diameter of the outer tubular metal electrode are kept consistent with those of an automobile tail gas pipe and a tubular connector, and the problems that tail gas coming out of an engine flows unsmoothly in a pipeline, and if the tail gas is inconsistent, the inner diameter of the downstream is reduced to cause gas congestion and the like are solved.
Shallow screw threads are machined on the inner wall surface of the discharge section and used for strengthening discharge. The length of the discharge section is not more than 10 times of the length of the internal thread connecting section.
The central rod-shaped metal electrode, as shown in fig. 5, is wrapped around its outer periphery by a central insulating sleeve, and the central rod-shaped metal electrode is preferably screwed to the central insulating sleeve.
The central rod-shaped metal electrode coated with the central insulating sleeve is coaxially inserted in the outer tubular metal electrode.
As shown in fig. 6 and 7, the upstream end of the central insulating sleeve is open and the downstream end is a closed end which is flush with the downstream end of the outer tubular metal electrode. The design of the central insulating sleeve can realize the wrapping and position fixing of the central rod-shaped metal electrode inside the central insulating sleeve, and the edge discharge of the outlet of the DBD exhaust pipe can be prevented after the downstream tail end is closed.
The annular channel between the central insulating sleeve and the outer tubular metal electrode is an automobile exhaust treatment channel, also called an air gap or a discharge gap.
The outer wall surface of the central insulating sleeve is connected with the inner wall surface of the middle section of the tubular connector through one group of herringbone supporting frames, and is connected with the inner wall surface of the outer tubular metal electrode through the other group of herringbone supporting frames.
the V-shaped support rod plays a role in supporting and fixing the central rod-shaped metal electrode and the central insulating sleeve, and can also isolate the high-voltage lead from the outer tubular metal electrode to prevent preferential discharge between the high-voltage lead and the outer tubular metal electrode.
Each group of the herringbone support frames comprises three support rods 14 which are uniformly distributed along the circumferential direction, and as shown in fig. 12, each support rod is cylindrical.
A threading through hole 141 shown in fig. 13 is formed in one support column of the upstream herringbone support frame, the threading through hole corresponds to the outer threading hole, and an inner threading hole 131 is formed in the central insulating sleeve corresponding to the threading through hole.
The tubular connector, the central insulating sleeve and the support column are all made of ceramic materials.
The upstream V-shaped support frame is arranged, so that the inner diameter and the outer diameter of the outer tubular metal electrode can be consistent with those of the automobile tail gas pipe and the tubular connector on one hand; on the other hand, the tubular connector is made of ceramic materials, so that an outer threading hole is convenient to open, a lead can conveniently pass through, and discharge between the lead and an outer tubular metal electrode in the downstream DBD exhaust pipe is prevented.
In addition, the axial distance between the upstream V-shaped support frame and the upstream end of the outer tubular metal electrode (namely the upstream end of the internal thread connecting section) is not less than the thickness dimension of the discharge gap, so that the preferential discharge between the high-voltage lead and the outer tubular metal electrode is prevented.
In the utility model, the outer tubular metal electrode is grounded to form a ground electrode; the central rod-shaped metal electrode is connected with the transformer through a lead to form a high-voltage electrode; wherein, the lead is connected with the central rod-shaped metal electrode after sequentially passing through the outer threading hole, the threading through hole and the inner threading hole.
The transformer and the vehicle-mounted power supply regulator are both connected with a vehicle-mounted storage battery 40, and the discharge type is preferably microsecond and millisecond pulse discharge or high-frequency alternating current discharge.
The flue gas concentration measuring device 50 is used for measuring the flue gas at the outlet of the automobile exhaust gas treatment channel. The smoke concentration measuring device is preferably a handheld smoke concentration analyzer, and the smoke concentration measuring device can measure smoke at the outlet of the automobile tail gas treatment channel by placing the measuring probe 51 at the outlet of the automobile tail gas treatment channel.
the following will describe in detail the layout method of the automobile exhaust pipe, the tubular connector and the outer tubular metal electrode with the same inner diameter by taking a specific example.
As shown in fig. 16, the inner diameter of the exhaust pipe of the automobile is 40mm in the normal exhaust pipe of the automobile, and the dimension unit in the figure is mm.
The inner diameter of the pipe fitting connector is 40mm, the wall thickness of the external threaded connecting end is 3-10mm, the wall thickness of the middle section is 6-15mm, the axial length of the two sections of threaded connecting ends is greater than 20 mm, and the length is as small as possible on the basis of ensuring reliable connection; the diameters of the outer threading hole, the threading through hole and the inner threading hole are all 1-3 mm.
The diameter of the support rod is 6-15mm, wherein the axial position of the inlet end of the upstream herringbone support frame is more than 5mm away from the open end of the central insulating sleeve, so that the stress balance between the central insulating sleeve and the electrode is ensured.
In addition, the distance between the center of the support rod in the upstream herringbone support frame and the opening of the upstream external thread connecting end is not less than 8 mm. This has the advantage of preventing a discharge from occurring directly between the wire and the nearest outer electrode, while no discharge occurs downstream in this discharge region.
The wall thickness of the discharge section in the outer tubular metal electrode is 6-15mm, and the discharge section is kept flush with the inner surface and the outer surface after the tubular connector is assembled; the diameter of the central rod-shaped metal electrode is 8-15 mm, the wall thickness of the central insulating sleeve is 3-5 mm, the cross section of an outlet is parallel and level after the central rod-shaped metal electrode and the central insulating sleeve are in threaded connection, and the wall thickness of the closed end of the central insulating sleeve is 3-6 mm.
the specific assembly mode is as follows: one end of the tubular connector is connected with the automobile exhaust pipe through threads, the other end of the tubular connector is connected with the tubular metal electrode outside the DBD exhaust pipe through threads, and the threads are sealed threads or added with sealant/tapes; the central rod-shaped electrode is screwed into the central insulating sleeve, namely the central insulating sleeve wraps the central rod-shaped metal electrode, the closed end is used for axially fixing the central electrode, and the central electrode and the central insulating sleeve are connected by threads; two groups of support frames in a herringbone shape are adopted to support a central rod-shaped metal electrode and a central insulating sleeve, the adjacent support rods in the single group of support frames in the herringbone shape are arranged in an angle of 120 degrees, wherein a 1 mm threading through hole is formed in the center of one support rod in the herringbone support frame away from an air inlet end, and the threading through hole is aligned with an inner threading hole and an outer threading hole so as to ensure that a lead passes through and contacts the central rod-shaped metal electrode.
The tubular connector, the central insulating sleeve and all the support rods are made of ceramic materials, and the central rod-shaped metal electrode and the outer tubular metal electrode can be made of common electrode metal such as steel, copper and the like. The support rod, the outer tubular metal electrode, the tubular connector and the central insulating sleeve are all in threaded connection.
The arrangement of the support rods can ensure that the airflow is blocked uniformly, and according to the aerodynamic principle, as shown in fig. 14, a backflow area 60 is formed at the downstream of each support rod for the incoming flow of the tail gas, so that the residence time of the tail gas in the DBD exhaust pipe is prolonged, and the discharge reaction is enhanced.
Because the supporting rod is a cylinder and is perpendicular to the incoming flow direction of the exhaust pipe, a classical cylindrical circumfluence flow field is formed, the flow line diagram of the flow field is shown in fig. 14, it can be seen that due to the existence of the cylinder, a pair of backflow zones 60 are formed at the positions close to the cylinder downstream of the cylinder, and fluid particles in the backflow zones even move upstream according to the fluid mechanics knowledge; fig. 15 shows a cloud chart of velocity distribution of a cylindrical streaming flow field, and compared with an incoming flow, the backflow region is obviously a low-flow-velocity region 62, and can affect a far downstream position of the cylinder, so that automobile exhaust gas can form the corresponding backflow region and the low-flow-velocity region after passing through each support rod, so that the residence time of the exhaust gas in the backflow region is remarkably increased, discharge starts at the downstream of the support rod of the tubular connector, namely the action time of the discharge on each fluid particle is prolonged, and discharge-related reactions such as ionization, decomposition, oxidation and the like are more thoroughly performed, so that the exhaust gas purification effect is better. In addition, due to the adoption of the scheme that two groups of the upstream supporting rods and two groups of the downstream supporting rods are adopted, the 6 supporting rods are totally arranged, materials are saved to the maximum extent, the effects of supporting and fixing the central rod-shaped metal electrode and the central insulating sleeve are achieved, the tail gas is purified more thoroughly by the DBD exhaust pipe by utilizing the cylindrical streaming speed reduction effect, the symmetry of the airflow field structure in the exhaust pipe can be kept to the maximum extent by the symmetrical supporting frame design scheme, and the discharging effect on the whole tail gas is more uniform.
The utility model discloses in, to the selection of bracing piece quantity and diameter, also design out after long-term trial and error, can know through above-mentioned analysis, the bracing piece diameter is big more, and when tail gas incoming flow condition was unchangeable, low reaches backward flow district and low velocity of flow district volume were big more for tail gas is showing the increase at wherein dwell time, and tail gas treatment is better. However, the diameter of the support rod is too large, which may seriously affect the effective passing area of the DBD exhaust pipe, possibly resulting in exhaust gas congestion, and the exhaust gas temperature is high, because if the passing area of the exhaust pipe is too small, the heat cannot be dissipated, which may cause explosion hazard.
Therefore, the utility model discloses in, three spinal branch vaulting poles are all selected to every group "people" font support frame, to influencing minimum and can save material through the area like this, and will guarantee to have certain intensity and rigidity in order to effectively support central shaft-like metal electrode in the diameter design. And, three bracing piece low reaches all can form symmetrical backward flow district and low velocity of flow district to prolong tail gas dwell time, make to the tail gas ionization treatment more abundant.
when the DBD exhaust pipe works, a vehicle-mounted storage battery carried by an automobile is used for supplying power, the continuous direct-current voltage of the vehicle-mounted storage battery is converted into one of microsecond, millisecond pulse voltage or high-frequency alternating-current voltage through a converter, the one of microsecond and millisecond pulse voltage or high-frequency alternating-current voltage is applied to the electrode of the DBD exhaust pipe through a lead, dielectric barrier discharge is formed between a central insulating sleeve and an outer tubular metal electrode, gas discharged by an automobile engine enters the DBD exhaust pipe after passing through a section of pipeline (tubular joint), and is ionized when flowing through a discharge area to form a typical non-flat surfacethe plasma is equilibrated, in which a series of discharge reactions and conventional chemical reactions take place, reducing or eliminating harmful gases and solid particles, thereby forming a clean exhaust gas to be discharged into the atmosphere. Because the tail gas states of the automobile under different working conditions such as starting, flameout and different gears are different, the treated tail gas can be detected by utilizing the handheld smoke analyzer at the tail gas automobile opening, and the CO, NO and NO in the product can be measured by inserting the measuring probe of the smoke analyzer into the tail end pipe of the exhaust pipe2、SO、SO2And the like; and then the conditions of the vehicle-mounted power supply regulator are applied to discharge parameters on the DBD exhaust pipe, and the change of the concentration of tail gas components is monitored by using a flue gas analyzer, so that the optimal power supply control is realized.
Carrying out the process
Taking a gasoline car as an example, when the engine of the car works, the fuel reacts with air to generate CO during normal combustion2And H2O and excessive oxygen, but because the fuel contains impurities and the fuel is often incompletely combusted, harmful substances, mainly CO, NO and NO, are discharged2And some carbon particles. Open integration automobile exhaust purifier through on-vehicle power supply regulator after the engine is pneumatic, tail gas gets into integration automobile exhaust purifier soon after leaving the engine and takes place the discharge reaction, and wherein electron collision reaction rate is often far higher than traditional burning chemical reaction, is favorable to forming active group such as O, N, OH fast and continues to take place oxidation reaction etc. very much, for example: discharge ionization reaction e + O2⟶e+O+O、e+N2⟶ e + N + N, the active particles generated by ionization generate a series of oxidation reactions and reduction reactions O + CO ⟶ CO2、N + NO ⟶ O + N2、N + NO2=> O + O + N2、N + NO2 => N2 + O2、O + NO => N + O2、O + N2O => N2 + O2Thereby achieving the purpose of purifying main pollutants of CO, NO and NO in the tail gas2The purpose of (1). In addition, carbon particles in the exhaust gas are mainly particles of carbon black and some metal oxides, and the carbon black and the metal oxides have certain electrical conductivity and are subjected to dischargeThe particles can respectively move directionally according to respective charged states and are adsorbed on the surfaces of the outer tubular metal electrode and the central insulating sleeve, and due to the fact that the integrated automobile exhaust purification device adopts a modular design, after the outer tubular metal electrode can be detached after impurities are deposited on the surfaces of the outer tubular metal electrode and the central insulating sleeve, the inner surface and the outer surface of the outer tubular metal electrode can be cleaned, and the integrated automobile exhaust purification device can be used after being installed. Can utilize hand-held type flue gas analyzer on-line monitoring tail gas harmful substance concentration such as CO, NO in the tail gas treatment process, when finding its concentration higher, operate vehicle mounted power regulator, change discharge voltage, pulse frequency, pulse width isoparametric to change the discharge characteristic, and then reach and change tail gas harmful substance concentration effect, find the tail gas harmful substance concentration of monitoring after adjusting the discharge parameter and up to standard, can keep this regulating parameter unchangeable, otherwise continue to change regulating parameter until tail gas harmful substance concentration up to standard.
the above detailed description describes the preferred embodiments of the present invention, but the present invention is not limited to the details of the above embodiments, and the technical idea of the present invention can be within the scope of the present invention to perform various equivalent transformations, which all belong to the protection scope of the present invention.
Claims (9)
1. The utility model provides an integration automobile exhaust purifier based on dielectric barrier discharge which characterized in that: the device comprises a DBD exhaust pipe, a tubular connector, a power converter, a vehicle-mounted power supply regulator and a smoke concentration measuring device;
The DBD exhaust pipe comprises an outer tubular metal electrode, a central rod-shaped metal electrode, a central insulating sleeve and two groups of herringbone supporting frames;
The tubular connector comprises a middle section and connecting ends positioned at two ends of the middle section, wherein one connecting end is connected with the automobile exhaust pipe, and the other connecting end is connected with the outer tubular metal electrode;
The periphery of the central rod-shaped metal electrode is coated with a central insulating sleeve, and the central rod-shaped metal electrode coated with the central insulating sleeve is coaxially inserted in the outer tubular metal electrode;
The central rod-shaped metal electrode is connected with a transformer through a lead, and the transformer and the vehicle-mounted power supply regulator are both connected with a vehicle-mounted storage battery;
The downstream tail end of the central insulating sleeve is a closed end which is flush with the downstream tail end of the outer tubular metal electrode;
The outer wall surface of the central insulating sleeve is connected with the inner wall surface of the middle section of the tubular connector through one group of herringbone supporting frames and is connected with the inner wall surface of the outer tubular metal electrode through the other group of herringbone supporting frames;
Each group of the herringbone support frames comprises three cylindrical support rods which are uniformly distributed along the circumferential direction;
The annular channel between the central insulating sleeve and the outer tubular metal electrode is an automobile exhaust treatment channel, and the flue gas concentration measuring device is used for measuring the flue gas at the outlet of the automobile exhaust treatment channel.
2. The integrated automobile exhaust purification device based on dielectric barrier discharge as claimed in claim 1, wherein: the inner diameters of the automobile tail gas pipe, the tubular connector and the outer tubular metal electrode are equal.
3. The integrated automobile exhaust purification device based on dielectric barrier discharge as claimed in claim 2, wherein: the outer diameters of the automobile tail gas pipe, the tubular connector and the outer tubular metal electrode are also equal.
4. The integrated automobile exhaust gas purification device based on dielectric barrier discharge according to claim 1, 2 or 3, wherein: two links of tubulose connector are the external screw thread link, and outer tubulose metal electrode includes discharge section and female connection section, and the wall thickness of female connection section is less than the wall thickness of discharge section, and one of them external screw thread link threaded connection of female connection section and tubulose connector, another external screw thread link and automobile exhaust pipe threaded connection.
5. The integrated automobile exhaust purification device based on dielectric barrier discharge as claimed in claim 4, wherein: the length of the discharge section is not more than 8 times of the length of the internal thread connecting section.
6. The integrated automobile exhaust purification device based on dielectric barrier discharge as claimed in claim 4, wherein: shallow screw threads are processed on the inner wall surface of the discharge section.
7. the integrated automobile exhaust gas purification device based on dielectric barrier discharge according to claim 1, 2 or 3, wherein: the central rod-shaped metal electrode is in threaded connection with the central insulating sleeve.
8. The integrated automobile exhaust gas purification device based on dielectric barrier discharge according to claim 1, 2 or 3, wherein: a threading through hole is formed in one supporting column in a group of inverted V-shaped supporting frames connected with the tubular connectors, an outer threading hole is formed in the tubular connector corresponding to the threading through hole, an inner threading hole is formed in the central insulating sleeve corresponding to the threading through hole, and a lead sequentially penetrates through the outer threading hole, the threading through hole and the inner threading hole and then is connected with the central rod-shaped metal electrode.
9. The integrated automobile exhaust gas purification device based on dielectric barrier discharge according to claim 1, 2 or 3, wherein: the tubular connector, the central insulating sleeve and the support column are all made of ceramic materials.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920503955.7U CN209781006U (en) | 2019-04-15 | 2019-04-15 | Integrated automobile exhaust purification device based on dielectric barrier discharge |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920503955.7U CN209781006U (en) | 2019-04-15 | 2019-04-15 | Integrated automobile exhaust purification device based on dielectric barrier discharge |
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| CN209781006U true CN209781006U (en) | 2019-12-13 |
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| CN201920503955.7U Active CN209781006U (en) | 2019-04-15 | 2019-04-15 | Integrated automobile exhaust purification device based on dielectric barrier discharge |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109854342A (en) * | 2019-04-15 | 2019-06-07 | 中国人民解放军战略支援部队航天工程大学 | All-in-one car exhaust gas cleaner based on dielectric barrier discharge |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109854342A (en) * | 2019-04-15 | 2019-06-07 | 中国人民解放军战略支援部队航天工程大学 | All-in-one car exhaust gas cleaner based on dielectric barrier discharge |
| CN109854342B (en) * | 2019-04-15 | 2023-11-21 | 中国人民解放军战略支援部队航天工程大学 | Integrated automobile exhaust purification device based on dielectric barrier discharge |
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