CN114320536A - Compact automobile engine exhaust aftertreatment assembly - Google Patents
Compact automobile engine exhaust aftertreatment assembly Download PDFInfo
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- CN114320536A CN114320536A CN202111661137.8A CN202111661137A CN114320536A CN 114320536 A CN114320536 A CN 114320536A CN 202111661137 A CN202111661137 A CN 202111661137A CN 114320536 A CN114320536 A CN 114320536A
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- 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
- Y02T10/12—Improving ICE efficiencies
-
- 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
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- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses a compact automobile engine tail gas aftertreatment assembly, which comprises an air inlet end cover, a DOC, a DPF, a mixer, an SCR, an air outlet end cover and a urea injector arranged on the mixer, wherein the air inlet end cover, the DOC, the DPF, the mixer, the SCR, the urea nozzle and the mixer are sequentially connected from front to back. The compact automobile engine tail gas aftertreatment assembly is a cylinder type shaft inlet and outlet, the uniformity of the airflow and the uniformity of the flow speed on the end surface of the DOC are good, the guarantee is provided for the safe regeneration of the following DPF and the uniform mixing of the urea, and a urea mixer which is compact in structure, simple and efficient is adopted, so that the mixing effect of the urea and the airflow is good, the urea is uniformly distributed on the end surface of the SCR carrier, the risk of urea crystallization is reduced, the mixing efficiency is improved, and the requirements of compact structure and simplicity are met.
Description
Technical Field
The invention relates to the field of automobile exhaust treatment, in particular to a compact automobile engine exhaust aftertreatment assembly.
Background
With the stricter and stricter emission standards of the tail gas pollutants of the national diesel vehicles, the new emission standards have extremely strict standards for the tail gas pollutants, and the strict emission standards cannot be met only by the internal purification technology of the engine, such as turbocharging, exhaust gas recirculation and the like. In the sixth national stage, pollutants such as PM (particulate matter), HC (hydrocarbon), CO (carbon monoxide) and NOx (nitrogen oxide) in exhaust pollutants need to be treated, and the content of the pollutants is controlled, so that the current sixth national emission standard can be met. There is therefore a need to integrate DOC (oxidation catalytic converter), DPF (particulate trap) and SCR (selective catalytic reduction converter) in diesel vehicle aftertreatment to reduce the exhaust emissions of diesel vehicles.
Under the action of a catalyst in the DOC carrier, HC (hydrocarbon) and CO (carbon monoxide) in the tail gas of the diesel engine react with oxygen in the tail gas to generate carbon dioxide and water.
The DPF carrier collects PM (particulate matter) in the exhaust gas by filtration and storage, and periodically burns and treats the PM. DPF has certain residue at regular burning, clearance in-process, and along with the accumulation of live time, the DPF carrier has the possibility of taking place to block up, just needs to dismantle whole aftertreatment device this moment, and the manual work clears up DPF carrier.
The SCR system pressurizes and sprays urea solution into mist by an injector, the urea solution is mixed with engine exhaust gas, and ammonia (NH) is decomposed after the urea solution meets high temperature3) Ammonia (NH) decomposed from urea under the catalytic action of catalyst3) With Nitrogen Oxides (NO) in diesel engine exhaustX) Oxidation-reduction reaction occurs to generate nitrogen (N)2) And water (H)2O) to reduce NOXAnd (4) discharging. Generally, in order to increase the uniform effect of mixing the urea solution with the exhaust gas discharged from the engine, a mixer is installed in the engine exhaust gas after-treatment device, so that the urea solution and the exhaust gas discharged from the engine are sufficiently mixed in the mixer. When the sprayed urea solution and the waste gas are mixed unevenly in the mixer and meet local lowWhen the temperature or the air current is dead angle, the urea in the urea solution can be attached to the wall surface of the mixer, so that urea crystallization and blockage of the mixer are caused, the mixer of the SCR system is required to improve the mixing effect of the urea solution and the waste gas, and the urea crystallization risk is reduced to the minimum.
The existing diesel vehicle post-treatment devices capable of meeting the national emission standards are complex in structure, large in size, large in occupied space, poor in loading universality, and particularly have the defects that the injected urea solution is easy to crystallize and the like.
Disclosure of Invention
In order to solve the problems, the invention provides a compact automobile engine exhaust aftertreatment assembly which is compact and reliable in structure, can effectively integrate DOC, DPF, SCR, urea nozzles and a mixer together, can ensure that the DOC, DPF and SCR can stably and efficiently work, and can ensure that urea is uniformly distributed on the end face of an SCR carrier and no urea crystal occurs, so that PM, HC and NOx in the exhaust emission of a diesel engine meet the limit value standards of emission regulations.
In order to realize the purpose, the invention adopts the technical scheme that:
a compact automobile engine tail gas aftertreatment assembly comprises an air inlet end cover, an oxidation catalytic converter (DOC), a particle trap (DPF), a mixer, a selective catalytic reduction converter (SCR) and an air outlet end cover which are sequentially connected from front to back, and further comprises a urea injector arranged on the mixer; the tail gas inlet is formed in the gas inlet end cover, the gas outlet is formed in the gas outlet end cover, temperature sensors are arranged at the front end and the rear end of the oxidation catalytic converter DOC and the selective catalytic reduction converter SCR, a nitrogen-oxygen sensor is further arranged at the rear end of the selective catalytic reduction converter SCR, and a pressure sensor is arranged at the front end of the particulate filter DPF; the mixer comprises a mixer barrel, a first mixer clam shell and a second mixer clam shell are arranged in the mixer barrel from front to back, the side wall of the first mixer clam shell gradually becomes wider along the clockwise direction, the side wall of the second mixer clam shell gradually becomes wider along the anticlockwise direction, the end faces of the first mixer clam shell and the second mixer clam shell form a step transition surface at the narrowest and widest positions of the side walls, a mixer air inlet is arranged on the step transition surface of the first mixer clam shell, a mixer air outlet is arranged on the step transition surface of the second mixer clam shell, mixer turbulence plates are arranged at the upper parts in the first mixer clam shell and the second mixer clam shell, the mixer turbulence plates are positioned in the longitudinal section of the inner mixer, the mixer air inlet and the mixer air outlet are respectively positioned at one side of the clockwise direction and one side of the anticlockwise direction of the mixer turbulence plates, holes are formed in the mixer barrel and positioned obliquely above the mixer air inlet, the urea nozzle of the urea injector extends into the bore and towards the mixer inlet.
The oxidation catalytic converter DOC and the particulate filter DPF are connected through detachable hoops, the particulate filter DPF and the mixer are connected through detachable hoops, and the mixer and the selective catalytic reduction converter SCR are connected through detachable hoops.
The oxidation catalytic converter DOC comprises a DOC outer cylinder body, DOC heat preservation cotton, a DOC inner cylinder body and a DOC carrier which are sequentially arranged from outside to inside.
The particulate trap DPF comprises a DPF cylinder body, DPF heat-insulation cotton, a DPF inner cylinder body and a DPF carrier which are sequentially arranged from outside to inside.
The SCR comprises an SCR cylinder body, SCR heat-insulation cotton, an SCR inner cylinder body and an SCR carrier which are sequentially arranged from outside to inside, wherein the SCR carrier comprises an SCR carrier I and an SCR carrier II which are sequentially arranged from front to back.
The urea injector is fixed on the mixer through the injector base, the injector base comprises an installation base and a flow guide flared pipe, a urea nozzle reserved hole and a plurality of installation positioning holes are formed in the installation base, the installation positioning holes are matched with the installation holes of the urea injector in position, the flow guide flared pipe is horn-shaped, the diameter of the narrow opening end of the flow guide flared pipe is slightly larger than that of the urea nozzle reserved hole, the narrow opening end of the flow guide flared pipe is welded on the periphery of the urea nozzle reserved hole, and the flared end of the flow guide flared pipe is a cambered surface matched with the shape of a mixer barrel.
Compared with the prior art, the invention has the following beneficial effects:
the compact automobile engine tail gas aftertreatment assembly provided by the invention effectively integrates the DOC, the DPF, the SCR, the urea nozzle and the mixer into a barrel type aftertreatment, has compact and reliable structure, good loading universality and wide application range, can ensure that the DOC, the DPF and the SCR can work stably and efficiently, and can treat the tail gas to meet the national emission standard through oxidation of pollutants such as HC, CO and the like by the DOC, trapping of soot generated by an engine by the DPF and reduction of pollutants such as NOx and the like in the pollutants by the SCR. The compact automobile engine tail gas aftertreatment assembly is a cylinder type shaft inlet and outlet, the uniformity of the airflow and the uniformity of the flow speed on the end surface of the DOC are good, the guarantee is provided for the safe regeneration of the following DPF and the uniform mixing of the urea, and a urea mixer which is compact in structure, simple and efficient is adopted, so that the mixing effect of the urea and the airflow is good, the urea is uniformly distributed on the end surface of the SCR carrier, the risk of urea crystallization is reduced, the mixing efficiency is improved, and the requirements of compact structure and simplicity are met.
Furthermore, in the invention, the DPF carrier section and the urea mixer section adopt a detachable hoop connection mode, so that the disassembly is realized, the disassembly mode is flexible, and the periodic disassembly and the re-assembly after cleaning of the DPF carrier and the urea mixer are convenient.
Furthermore, in the invention, part of the cylinder body adopts a double-layer structure, and heat-preservation cotton is filled in the middle. The heat preservation performance is good and the cost is saved.
Furthermore, in the invention, the injector base can adapt to the requirements of the installation position of the urea injector, so that the urea solution has better injection angle, atomization effect and mixing effect, the mixing uniformity of the urea solution and the engine exhaust gas is improved, the urea crystallization risk is obviously reduced, and the Nitrogen Oxide (NO) in the diesel engine exhaust emission is reducedX) The limit value standard of the emission regulation is met, and the device has the advantages of compact and simple structure, convenient processing and manufacturing, low cost, easy improvement and wide application range.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.
In the drawings:
FIG. 1 is a front view of a compact automotive engine exhaust aftertreatment assembly of the present invention;
FIG. 2 is a top view of the compact automotive engine exhaust aftertreatment assembly of the present invention;
FIG. 3 is a cross-sectional view of the compact automotive engine exhaust aftertreatment assembly of the present invention;
FIG. 4 is an internal block diagram of the compact automotive engine exhaust aftertreatment assembly of the present invention;
FIG. 5 is a schematic diagram of the mixer of the compact automotive engine exhaust aftertreatment assembly of the present invention, wherein (a) is a front view and (b) is a perspective view;
FIG. 6 is a schematic view of the operation of the compact automotive engine exhaust aftertreatment assembly of the present invention;
FIG. 7 is a schematic view of the urea mixing process of the compact automotive engine exhaust aftertreatment assembly of the present invention, wherein (a) is a front view and (b) is a side view;
FIG. 8 is a schematic diagram of the injector mount of the compact automotive engine exhaust aftertreatment assembly of the present invention, wherein (a) is a front view and (b) is a right side view;
in the figure: 1-an air inlet end cover, 2-a DOC outer cylinder body, 3-a detachable hoop, 4-a DPF cylinder body, 5-a mixer cylinder body, 6-an injector base, 7-an SCR cylinder body, 8-an air outlet end cover, 10-a temperature sensor, 11-a pressure sensor, 12-a nitrogen-oxygen sensor, 13-a urea injector, 14-holes, 15-a mixer air inlet, 16-a mixer air outlet, 17-a DOC inner cylinder body, 18-DOC heat preservation cotton, 19-a DPF inner cylinder body, 20-a DPF heat preservation cotton, 21-an SCR inner cylinder body, 22-SCR heat preservation cotton, 23-a DOC carrier, 24-a DPF carrier, 25-a mixer clam shell I, 26-a mixer clam shell II, 27-an SCR carrier I, 28-an SCR carrier II and 29-a mixer spoiler, 61-mounting a base, 62-guiding flared tubes, 63-urea nozzle preformed holes and 64-mounting positioning holes.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1-4, the compact automobile engine exhaust aftertreatment assembly provided by the invention comprises an air inlet end cover 1, an oxidation catalytic converter DOC (DOC section), a particulate filter DPF (DPF section), a mixer, a selective catalytic reduction converter SCR (SCR section), an air outlet end cover 8, and a urea injector 13 arranged on the mixer, wherein the air inlet end cover 1, the oxidation catalytic converter DOC (DOC section), the particulate filter DPF (DPF section), the mixer, the selective catalytic reduction converter SCR (SCR section), and the air outlet end cover 8 are sequentially connected from front to back. And a tail gas inlet is formed in the gas inlet end cover 1, and a gas outlet is formed in the gas outlet end cover 8.
The oxidation catalytic converter DOC (DOC section) comprises a DOC outer cylinder 2, DOC heat preservation cotton 18, a DOC inner cylinder 17 and a DOC carrier 23 which are sequentially arranged from outside to inside.
The particulate trap DPF (DPF section) comprises a DPF cylinder body 4, DPF heat-insulating cotton 20, a DPF inner cylinder body 19 and a DPF carrier 24 which are sequentially arranged from outside to inside.
The SCR (SCR segment) of the selective catalytic reduction converter comprises an SCR cylinder body 7, SCR heat-insulating cotton 22, an SCR inner cylinder body 21 and an SCR carrier which are sequentially arranged from outside to inside, wherein the SCR carrier comprises an SCR carrier I27 and an SCR carrier II 28 which are sequentially arranged from front to back.
The front ends and the rear ends of the oxidation catalytic converter DOC and the selective catalytic reduction converter SCR are respectively provided with a temperature sensor 10, the rear end of the selective catalytic reduction converter SCR is also provided with a nitrogen-oxygen sensor 12, and the front end of the particulate trap DPF is provided with a pressure sensor 11;
the concrete structure of the mixer is shown in fig. 5, and comprises a mixer cylinder 5, a first mixer clam shell 25 and a second mixer clam shell 26 are arranged in the mixer cylinder 5 from front to back, the first mixer clam shell 25 and the second mixer clam shell 26 form a twisted cylinder, the side wall of the first mixer clam shell 25 gradually widens in the clockwise direction and gradually reduces in diameter, the side wall of the second mixer clam shell 26 gradually widens in the counterclockwise direction and gradually reduces in diameter, the end surfaces of the first mixer clam shell 25 and the second mixer clam shell 26 form a raised step transition surface at the narrowest and widest positions of the side wall, a mixer air inlet 15 is arranged on the step transition surface of the first mixer clam shell 25, a mixer air outlet 16 is arranged on the step transition surface of the second mixer clam shell 26, the mixer air inlet 15 and the mixer air outlet 16 are positioned at the upper parts of the first mixer clam shell 25 and the second mixer clam shell 26, the mixer spoiler 29 is arranged at the upper parts in the first mixer clam shell 25 and the second mixer clam shell 26, the mixer spoiler 29 is positioned in the longitudinal section of the inner mixer, the height of the mixer spoiler 29 is slightly smaller than the radius of the mixer, the mixer air inlet 15 and the mixer air outlet 16 are respectively positioned on one side of the mixer spoiler 29 in the clockwise direction and one side of the mixer in the anticlockwise direction and are separated by the mixer spoiler 29, the mixer barrel 5 is provided with a hole 14, and the hole 14 is positioned obliquely above the mixer air inlet 15.
The injector base 6 comprises an installation base 61 and a flow guide flared pipe 62, a urea nozzle reserved hole 63 and a plurality of installation positioning holes 64 are formed in the installation base 61, the installation positioning holes 64 are formed in positions matched with the installation hole positions of the urea injector 13, the flow guide flared pipe 62 is horn-shaped, the diameter of the narrow end of the flow guide flared pipe 62 is slightly larger than that of the urea nozzle reserved hole 63, the narrow end of the flow guide flared pipe 62 is welded to the periphery of the urea nozzle reserved hole 63, and the flared end of the flow guide flared pipe 2 is a cambered surface adaptive to the shape of the mixer barrel 5. The size of the flaring end of the flow guide flaring pipe 2 is slightly larger than the size of the hole 14 on the mixer cylinder 5, the flaring end of the flow guide flaring pipe 2 is welded on the periphery of the hole 14 of the mixer cylinder 5, the installation positioning hole 11 is fixedly connected with the installation hole of the urea injector through a positioning hole bolt, the urea injector 13 is fixed on the injector base 6, and after being sprayed out from the urea injector, the urea solution enters the mixer cylinder 5 after being diffused through the flow guide flaring pipe 2 and is sprayed towards the mixer air inlet 15.
The oxidation catalytic converter DOC is connected with the particle trap DPF through a detachable hoop 3, the particle trap DPF is connected with the mixer, and the mixer is connected with the selective catalytic reduction converter SCR through a detachable hoop 3.
The components of the invention are as follows:
the air inlet end cover 1 is made of SUS304 stainless steel, is 1.5mm thick and is formed by steel plate pipe coiling, welding, spinning and other processes;
the DOC outer cylinder body 2 is made of SUS304 stainless steel, is 1.5mm thick and is formed by steel plate pipe coiling, welding, cutting and other processes;
the detachable anchor ear 3 is purchased in the existing market model, so that reliable sealing and convenient detachment are ensured;
the DPF cylinder 4 is made of SUS304 stainless steel with the thickness of 1.5mm and is formed by steel plate pipe coiling, welding, cutting and other processes;
the mixer cylinder 5 is made of SUS304 stainless steel, has the thickness of 1.5mm, and is formed by steel plate pipe coiling, welding, cutting and other processes;
the ejector base 6 is made of cast iron through machining and molding; wherein the mounting base 61 is made of stainless steel or cast iron, has the thickness of 8-12mm, is formed by cutting the existing steel plate with the thickness of 8-12mm, machining, cutting, grinding, drilling steel plate pipe coiling, welding and other processes; the flow guide flared pipe 62 is made of SUS304 stainless steel, has the thickness of 1.5-2mm, and is formed by cutting, welding, polishing and other processes; the mounting base 61 is connected with the flow guide flared pipe 62 in a welding mode, so that smooth transition and no burrs at the welding position are ensured.
The SCR cylinder 7 is made of SUS304 stainless steel, is 1.5mm thick and is formed by steel plate pipe coiling, welding, cutting and other processes;
the air outlet end cover 8 is made of SUS304 stainless steel, is 1.5mm thick and is formed by steel plate pipe coiling, welding, spinning and other processes;
the temperature sensor 10, the current model of the market is purchased;
the pressure sensor 11, the current model of the market is purchased;
a nitrogen oxygen sensor 12, the current model of the market is purchased;
the urea injector 13 is purchased in the existing market model, and ensures the injection pressure and the atomization effect;
the DOC inner cylinder body 17 is made of SUS304 stainless steel, is 1.0mm thick and is formed by steel plate pipe coiling, welding, cutting, spinning and other processes;
DOC heat preservation cotton 18, the existing model in the market is purchased, and the good heat preservation effect is ensured;
the DPF inner cylinder body 19 is made of SUS304 stainless steel, the thickness of the DPF inner cylinder body is 1.0mm, and the DPF inner cylinder body is formed by steel plate pipe coiling, welding, cutting, spinning and other processes;
the SCR inner cylinder 21 is made of SUS304 stainless steel, is 1.0mm thick and is formed by steel plate pipe coiling, welding, cutting, spinning and other processes;
SCR heat preservation cotton 22, the existing model in the market is purchased, and the heat preservation effect is good;
25, preparing a mixer clam shell I, wherein the thickness of the mixer clam shell I is 2mm, and the mixer clam shell I is die-opened, cast and molded, mechanically processed, ground and polished to ensure no burrs;
the second mixer clam shell 26 is made of stainless steel materials and has the thickness of 2mm, and the second mixer clam shell is molded by die sinking and casting, mechanically processed, ground and polished to ensure no burrs;
SCR carrier one 27, the current model of the market is purchased;
SCR carrier two 28, the current model of the purchase market;
the mixer spoiler 29 is made of SUS304 stainless steel and has a thickness of 1.0mm, and is formed by cutting and punching a steel plate, and is ground and polished to ensure no burrs.
The DOC section, the DPF section and the SCR section are of double-layer structures, and heat-insulating cotton is filled in the DOC section, the DPF section and the SCR section to ensure that the catalyst of the DOC carrier, the catalyst of the SCR carrier and the DPF have enough temperature during combustion and regeneration; the DOC outer cylinder body is connected with the air inlet end cover in a welding mode, and the SCR cylinder body is connected with the air outlet end cover in a welding mode; DOC section and DPF section adopt detachable staple bolt to be connected, and DPF section and blender barrel adopt detachable staple bolt to be connected, and the blender barrel adopts detachable staple bolt to be connected with the SCR barrel, dismantlement and maintenance in the facilitate of use.
The front and the back of the DOC section are respectively provided with a temperature sensor for detecting the catalytic oxidation effect of the DOC catalyst on HC and CO; the front end of the DPF section is provided with a pressure sensor which is used for detecting whether the DPF carrier is blocked or not and judging when the DPF needs to be regenerated; the front and the back of the SCR segment are respectively provided with a temperature sensor for detecting the working temperature of the SCR carrier catalyst, and the back end of the SCR segment is provided with a nitrogen-oxygen sensor for monitoring the catalytic effect of the SCR catalyst.
The specific working process of the invention is shown in fig. 6: exhaust gas discharged by an engine enters from a tail gas inlet of an air inlet end cover 1, the high-temperature and high-pressure exhaust gas uniformly enters a DOC carrier through diffusion of the air inlet end cover, and HC, CO and the like in the exhaust gas are converted into CO under the catalytic action of a DOC catalyst2And H2O; then, the exhaust gas flows into the DPF carrier, and tiny particulate matters, soot and the like in the exhaust gas are filtered by the DPF carrier and are left in the DPF carrier; high-speed, the waste gas of high temperature gets into the blender next, do high-speed whirl motion inside the blender, urea sprayer sprays urea solution to the blender with inclination from the blender air inlet simultaneously, urea solution gets into inside the blender along with high-speed air current, do high-speed rotary motion together with engine waste gas (this kind of high-speed rotary motion has been guaranteed to the blender spoiler, avoid the air current to flow from the blender air inlet back directly from the blender gas outlet, make urea solution and waste gas intensive mixing under the effect of high-speed rotatory in-process and blender spoiler, as shown in figure 7, the homogeneity of mixing has been improved, the emergence of urea crystallization phenomenon has been obviously inhibited. After urea solution is fully mixed, urea is decomposed into NH under the action of high temperature3(ammonia gas) enters the SCR carrier along with the gas flow, and NO in the exhaust gas is generated under the action of the SCR carrier catalystxAnd NH3A chemical reaction is carried out to generate N2(Nitrogen) and H2O (water), thereby achieving the effect of purifying the tail gas.
When the injection angle and the injection position of the urea solution need to be adjusted, the installation position of the flow guide flared pipe and the inclination angle and the size of the flow guide flared pipe only need to be adjusted, the installation base does not need to be machined and manufactured again, the cost is reduced, and the urea solution injection device is easy to realize.
In the invention, under the action of a catalyst in a DOC carrier, HC (hydrocarbon) and CO (carbon monoxide) in the tail gas of the diesel engine react with oxygen in the tail gas to generate carbon dioxide and water; the DPF carrier collects PM (particulate matters) in the tail gas through filtration and storage, and periodically burns and processes the PM; the urea nozzle sprays urea aqueous solution, and in the mixer, the urea aqueous solution is mixed with tail gas and decomposed into NH3(ammonia gas) NOx (nitrogen oxide) and NH in the exhaust gas under the action of SCR carrier catalyst3(ammonia gas) to produce nitrogen (N)2) And water (H)2O). The invention adopts the advantages of compact and simple structureThe efficient urea mixer reduces the risk of urea crystallization, improves the mixing efficiency, and meets the requirements of compact and simple structure. The injector base can meet the requirements of the installation position of the urea injector, so that the urea solution has a better injection angle, an atomization effect and a mixing effect, the mixing uniformity of the urea solution and the engine exhaust gas is improved, and the urea crystallization risk is obviously reduced.
The present invention has been described in further detail with reference to the embodiments, and it is not to be construed that the embodiments are limited thereto; for those skilled in the art to which the present invention pertains and related technologies, the extension, operation method and data replacement should fall within the protection scope of the present invention based on the technical solution of the present invention.
Claims (6)
1. The utility model provides a compact automobile engine exhaust aftertreatment assembly which characterized in that: the device comprises an air inlet end cover (1), an oxidation catalytic converter (DOC), a particle trap (DPF), a mixer, a selective catalytic reduction converter (SCR) and an air outlet end cover (8) which are sequentially connected from front to back, and further comprises a urea injector (13) arranged on the mixer; a tail gas inlet is formed in the gas inlet end cover (1), a gas outlet is formed in the gas outlet end cover (8), temperature sensors (10) are arranged at the front end and the rear end of the oxidation catalytic converter (DOC) and the selective catalytic reduction converter (SCR), a nitrogen-oxygen sensor (12) is further arranged at the rear end of the selective catalytic reduction converter (SCR), and a pressure sensor (11) is arranged at the front end of the particulate filter (DPF); the mixer comprises a mixer barrel body (5), a first mixer clam shell (25) and a second mixer clam shell (26) are arranged in the mixer barrel body (5) from front to back, the side wall of the first mixer clam shell (25) gradually widens along the clockwise direction, the side wall of the second mixer clam shell (26) gradually widens along the anticlockwise direction, the end faces of the first mixer clam shell (25) and the second mixer clam shell (26) form a step transition surface at the narrowest and widest positions of the side walls of the first mixer clam shell (25), a mixer air inlet (15) is arranged on the step transition surface of the first mixer clam shell (25), a mixer air outlet (16) is arranged on the step transition surface of the second mixer clam shell (26), mixer turbulence sheets (29) are arranged on the upper portions in the first mixer clam shell (25) and the second mixer clam shell (26), the mixer turbulence sheets (29) are located in the longitudinal section of the inner mixer, and the mixer air inlet (15) and the mixer air outlet (16) are located on one side of the mixer turbulence sheets (29) in the clockwise direction respectively And one side in the anticlockwise direction, a hole (14) is formed in the mixer barrel (5), the hole (14) is located obliquely above the mixer air inlet (15), and a urea nozzle of the urea injector (13) extends into the hole (14) and faces the mixer air inlet (15).
2. The compact automotive engine exhaust aftertreatment assembly of claim 1, wherein: the oxidation catalytic converter DOC and the particulate trap DPF are connected through a detachable anchor ear (3), the particulate trap DPF and the mixer are connected, and the mixer and the selective catalytic reduction converter SCR are connected through a detachable anchor ear (3).
3. The compact automotive engine exhaust aftertreatment assembly according to claim 1 or 2, characterized in that: the oxidation catalytic converter DOC comprises a DOC outer cylinder (2), DOC heat-preservation cotton (18), a DOC inner cylinder (17) and a DOC carrier (23) which are sequentially arranged from outside to inside.
4. The compact automotive engine exhaust aftertreatment assembly according to claim 1 or 2, characterized in that: the particulate trap DPF comprises a DPF cylinder body (4), DPF heat-insulating cotton (20), a DPF inner cylinder body (19) and a DPF carrier (24) which are sequentially arranged from outside to inside.
5. The compact automotive engine exhaust aftertreatment assembly according to claim 1 or 2, characterized in that: the SCR comprises an SCR cylinder body (7), SCR heat-insulating cotton (22), an SCR inner cylinder body (21) and an SCR carrier which are sequentially arranged from outside to inside, wherein the SCR carrier comprises an SCR carrier I (27) and an SCR carrier II (28) which are sequentially arranged from front to back.
6. The compact automotive engine exhaust aftertreatment assembly according to claim 1 or 2, characterized in that: urea sprayer (13) are fixed on the blender through sprayer base (6), sprayer base (6) are including installation base (61) and water conservancy diversion flared tube (62), urea nozzle preformed hole (63) and a plurality of installation locating hole (64) have been seted up on installation base (61), the position of seting up of installation locating hole (64) matches with the mounting hole position of urea sprayer (13), water conservancy diversion flared tube (62) are tubaeform, the diameter of the narrow mouth end of water conservancy diversion flared tube (62) slightly is greater than the diameter of urea nozzle preformed hole (63), the welding of the narrow mouth end of water conservancy diversion flared tube (62) is peripheral in urea nozzle preformed hole (63), the flaring end of water conservancy diversion flared tube (2) is the cambered surface that suits with blender barrel (5) shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111661137.8A CN114320536A (en) | 2021-12-31 | 2021-12-31 | Compact automobile engine exhaust aftertreatment assembly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111661137.8A CN114320536A (en) | 2021-12-31 | 2021-12-31 | Compact automobile engine exhaust aftertreatment assembly |
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| CN114320536A true CN114320536A (en) | 2022-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111661137.8A Withdrawn CN114320536A (en) | 2021-12-31 | 2021-12-31 | Compact automobile engine exhaust aftertreatment assembly |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114961935A (en) * | 2022-07-04 | 2022-08-30 | 潍柴动力股份有限公司 | Preheat urea injection structure and aftertreatment device |
| CN115263506A (en) * | 2022-08-17 | 2022-11-01 | 一汽解放汽车有限公司 | Engine postprocessor assembly |
| CN115680839A (en) * | 2022-11-14 | 2023-02-03 | 一汽解放汽车有限公司 | Aftertreatment mixer and aftertreatment method for reducing urea crystallization |
-
2021
- 2021-12-31 CN CN202111661137.8A patent/CN114320536A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114961935A (en) * | 2022-07-04 | 2022-08-30 | 潍柴动力股份有限公司 | Preheat urea injection structure and aftertreatment device |
| CN115263506A (en) * | 2022-08-17 | 2022-11-01 | 一汽解放汽车有限公司 | Engine postprocessor assembly |
| CN115263506B (en) * | 2022-08-17 | 2024-02-23 | 一汽解放汽车有限公司 | Engine post-processor assembly |
| CN115680839A (en) * | 2022-11-14 | 2023-02-03 | 一汽解放汽车有限公司 | Aftertreatment mixer and aftertreatment method for reducing urea crystallization |
| CN115680839B (en) * | 2022-11-14 | 2024-05-10 | 一汽解放汽车有限公司 | Post-treatment mixer and post-treatment method for reducing urea crystallization |
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Application publication date: 20220412 |