WO2023131337A1 - 一种超紧凑后处理***、增压器组件及发动机 - Google Patents

一种超紧凑后处理***、增压器组件及发动机 Download PDF

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Publication number
WO2023131337A1
WO2023131337A1 PCT/CN2023/071532 CN2023071532W WO2023131337A1 WO 2023131337 A1 WO2023131337 A1 WO 2023131337A1 CN 2023071532 W CN2023071532 W CN 2023071532W WO 2023131337 A1 WO2023131337 A1 WO 2023131337A1
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Prior art keywords
mixer
ultra
catalytic
aftertreatment system
mixing
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PCT/CN2023/071532
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English (en)
French (fr)
Inventor
刘伟达
霍翠英
郑碧莹
Original Assignee
潍柴动力股份有限公司
潍柴动力空气净化科技有限公司
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Publication of WO2023131337A1 publication Critical patent/WO2023131337A1/zh

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2066—Selective catalytic reduction [SCR]
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
    • F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
    • F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
    • F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
    • F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
    • F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
    • F01N3/28—Construction of catalytic reactors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy
    • F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using heat
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/10—Carbon or carbon oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
    • F01N2570/14—Nitrogen oxides
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
    • F01N2610/00—Adding substances to exhaust gases
    • F01N2610/14—Arrangements for the supply of substances, e.g. conduits
    • F01N2610/1486—Means to prevent the substance from freezing
    • 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

Definitions

  • the invention relates to the technical field of automobile engines, in particular to an ultra-compact aftertreatment system, a supercharger assembly and an engine.
  • the post-treatment system refers to a catalytic converter capable of treating pollutants in diesel engine exhaust into carbon dioxide, nitrogen and water, etc., and is composed of catalysts, injection systems, mixers and packaging structures.
  • the existing post-processing system is generally arranged on the vehicle frame, that is, the exhaust gas comes out from the turbocharger at the engine end, and can enter the post-processing catalytic converter through a long exhaust pipe (about 2-3 meters). Influenced by the length of the gas pipe, the exposed exhaust pipe will form a heat dissipation effect on the exhaust gas, with a temperature drop of 20-60°C, thus affecting the conversion efficiency of the post-treatment catalyst.
  • the present invention provides an ultra-compact aftertreatment system that can be arranged in advance to avoid the temperature drop caused by the exhaust pipe, thereby Maximize the conversion efficiency of post-treatment catalysts.
  • the invention also discloses a supercharger assembly applying the ultra-compact aftertreatment system.
  • the invention also discloses an engine using the supercharger assembly.
  • An ultra-compact post-processing system disclosed in the present invention includes
  • a urea nozzle connected to the air inlet joint
  • the catalytic disc is arranged between the mixer and the inner wall of the housing, and is sheathed on the outer periphery of the mixer, and the catalytic disc separates the inner cavity of the housing It is the mixing chamber and the return air chamber;
  • the air outlet of the casing is arranged in the air return chamber, the air outlet end of the mixer is provided with a mixing section, and the mixing section is arranged in the mixing chamber.
  • a return air passage is formed between the outer periphery of the mixer and the inner wall of the housing, and the air outlet is arranged near the end of the return air passage.
  • the housing is provided with an arc-shaped bottom bowl structure toward the gas outlet of the mixer, so as to guide the air flow back to the return gas channel.
  • the catalytic disc is arranged at one end close to the inlet joint of the mixer.
  • the catalytic disk is respectively sealed and connected to the inner wall of the housing and the outer wall of the mixer.
  • the catalytic disc is a metal annular carrier or an annular ceramic cordierite carrier, and the carrier is coated with a copper-based molecular sieve SCR catalyst or a vanadium-based SCR catalyst coating.
  • the mixer includes a main body and a perforated plate, and the perforated plate is arranged perpendicular to the inner wall of the main body.
  • the porous plate is arranged close to the intake joint.
  • the invention also discloses a supercharger assembly, which includes a supercharger body and an ultra-compact aftertreatment system as described above, the supercharger body is provided with a supercharging outlet, and the supercharger The pressure outlet is connected to the inlet connection of the ultra-compact aftertreatment system.
  • the present invention also discloses an engine, which includes the aforementioned supercharger assembly.
  • an ultra-compact post-processing system and an applied supercharger assembly disclosed in the present invention have the following beneficial effects:
  • the present invention proposes a new type of ultra-compact aftertreatment system, which can be integrated with the supercharger body. Since the exhaust pipe is omitted, the exhaust temperature will not be lost from the exhaust pipe, and the exhaust gas will be fully reduced. Temperature loss, make full use of the exhaust gas temperature, provide good reaction conditions for the use of subsequent catalysts, and improve the conversion efficiency of the post-treatment system.
  • the present invention divides the inner chamber of the housing into a mixing chamber and a return air chamber through a catalytic disc, exhausting the tail gas to the mixing chamber can ensure sufficient reaction with the urea spray, and then enters the return air chamber through the catalytic disc from the mixing chamber, after passing through
  • the catalytic disc converts CO and NO x in the exhaust gas into CO 2 , N 2 and H 2 O to complete the post-treatment of the exhaust gas.
  • the catalytic disc adopts a ring structure and is placed outside the mixer to make full use of the space.
  • the temperature of the exhaust gas in the mixer can continuously heat the catalytic disc set on its outer periphery, which can obviously solve the catalytic reaction caused by the temperature drop. The problem of low conversion efficiency.
  • the mixing chamber and the return air chamber are still wrapped around the mixer, they can also play a role in heat preservation, reduce the heat loss during the exhaust gas exhaust process, and ensure the stability of the temperature in the catalytic process, thereby improving the conversion of the post-treatment system. efficiency.
  • the present invention optimizes the flow direction of the exhaust gas. Compared with the traditional linear discharge method, the present invention adopts the reentrant discharge method, which reduces the length of the entire post-treatment system and achieves a high degree of integration.
  • the heat dissipation area is relatively Lower, less heat loss, can accelerate the effect of catalysis.
  • the mixer in the present invention includes a mixing section arranged at the gas outlet, and the mixing section is provided with a mixing chamber located at the rear end of the catalytic disc, which can prolong the mixing path, ensure sufficient mixing, improve the uniformity of urea, and be able to form an impact on the catalytic disc.
  • the preheating pipeline reduces the temperature drop and improves the conversion efficiency.
  • the present invention proposes a post-treatment mixer for close coupling, which makes full use of the space and improves the uniformity of urea mixing.
  • the mixer is composed of a perforated plate, a certain length of main body and a mixing section, which maximizes the mixing distance of urea and exhaust gas.
  • the perforated plate has a certain number of holes with a certain diameter to improve the mixing efficiency, ensure sufficient mixing, and reduce the risk of crystallization.
  • FIG. 1 is a schematic structural diagram of an ultra-compact post-processing system in an embodiment of the present invention.
  • Fig. 2 is a schematic structural view of a supercharger assembly in an embodiment of the present invention.
  • 100-after-treatment system 110-mixer, 111-swirl sheet, 112-main body, 113-perforated plate, 120-urea nozzle, 130-housing, 131-gas outlet, 140-catalytic disc, 150-mixing Chamber, 160-return air chamber, 200-supercharger body.
  • the first feature may be in direct contact with the first feature or the first and second feature may be in direct contact with the second feature through an intermediary. touch.
  • descriptions referring to the terms “one embodiment”, “some embodiments”, “example”, “specific examples”, or “some examples” mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present invention.
  • the schematic representations of the above terms are not necessarily directed to the same embodiment or example.
  • the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
  • an ultra-compact aftertreatment system 100 disclosed in the present invention includes a mixer 110 , a urea nozzle 120 , a housing 130 and a catalytic disc 140 .
  • the urea nozzle 120 is used to connect to an external urea injection system, and the urea injection system is used to provide a urea source, which is applied in the selective catalytic reduction technology.
  • the main parts of the selective catalytic reduction system include urea pump, urea nozzle 120, reduction catalyst, nitrogen oxide sensor, temperature sensor, urea line and urea tank, etc.
  • the diesel engine sends the urea injection command to the urea pump according to the working conditions of the engine and other related conditions.
  • the trachea converts to ammonia, which turns nitrogen oxides into nitrogen and water.
  • the urea droplets are evenly sprayed through the urea nozzle 120 and can be fully mixed with the exhaust gas.
  • the mixer 110 is a component that atomizes and decomposes the aqueous urea solution injected from the urea nozzle 120 and mixes it with exhaust gas from the diesel engine.
  • the mixer 110 has an inlet end and an outlet end, the inlet end is provided with an air inlet joint, and the air inlet joint is used to connect the supercharger body 200, and the exhaust gas discharged from the supercharger body 200 enters the mixer 110 through the air inlet joint , and achieve mixed contact with the urea spray; from the perspective shown in Figure 1, the left end of the mixer 110 is the inlet end.
  • the casing 130 is sheathed on the outer periphery of the partial mixer 110 , and the casing 130 is provided with an air outlet 131 .
  • the casing 130 is sleeved on the air outlet end of the mixer 110 opposite to the air inlet end, and only a portion close to the air inlet end is exposed, and the exposed portion at least includes an air inlet joint for easy connection with a supercharger.
  • the rest of the mixer 110 protrudes into the casing 130 to form a mixing path; Part is located in the housing 130, forming a relatively closed space with the housing 130, and the relatively closed space communicates with the outside through the air outlet 131 of the housing 130; as shown in Figure 1, the urea nozzle 120 is also exposed on the housing 130, it is convenient to connect with related components such as urea pump.
  • the catalytic disk 140 is arranged in the casing 130, the catalytic disk 140 is arranged between the mixer 110 and the inner wall of the casing 130, and is sleeved on the outer periphery of the mixer 110, and the catalytic disk 140 divides the inner cavity of the casing 130 into a mixing chamber 150 and a mixing chamber 150.
  • Return air chamber 160 wherein the mixing chamber 150 is close to the outlet end of the mixer 110 relative to the return air chamber 160, and the outlet end of the mixer 110 communicates with the return air chamber 160.
  • the mixing chamber 150 and the return air chamber 160 are The above-mentioned relatively closed space is formed between the housing 130 and the mixer 110 , and the relatively closed space is divided into a mixing chamber 150 and a return air chamber 160 by the catalytic disc 140 .
  • the exhaust gas is mixed with urea spray, it is discharged from the outlet end of the mixer 110 to the mixing chamber 150, and then enters the catalytic disc 140 from the mixing chamber 150, and is catalyzed by the catalytic disc 140 to accelerate the exhaust gas (especially sulfur dioxide and other harmful gases). Restore, and turn back into the return air cavity 160.
  • the air outlet 131 of the casing 130 is disposed in the air return chamber 160 , and the gas entering the air return chamber 160 is discharged from the air outlet 131 .
  • the gas outlet end of the mixer 110 is provided with a mixing section, and the mixing section is arranged in the mixing chamber 150 .
  • the post-processing system in the prior art is arranged on the frame of the whole vehicle. Exhaust gas comes out of the turbocharger at the engine end and passes through a long exhaust pipe before entering the post-processing system for hybrid catalysis. In the stage, the temperature drop of 20°C to 60°C is caused by the exposed pipes, and the conversion efficiency of the catalyst will also be affected by the excessive temperature drop during the post-treatment catalysis process.
  • a new type of ultra-compact post-treatment system 100 disclosed in this embodiment can be integrated with the supercharger body 200. Since the exhaust pipe is omitted, the exhaust temperature will not be lost from the exhaust pipe, and the exhaust gas can be fully reduced.
  • the catalytic disk 140 is also used to divide the inner cavity of the housing 130 into a mixing chamber 150 and a return air chamber 160.
  • the exhaust gas is exhausted to the mixing chamber 150 to ensure sufficient reaction with the urea spray, and then the mixing chamber 150 passes through the catalytic disk 140.
  • the CO and NO x in the exhaust gas are converted into CO 2 , N 2 and H 2 O when passing through the catalytic disc 140, and the post-treatment of the exhaust gas is completed.
  • the catalytic disc 140 adopts an annular structure and is set on the outside of the mixer 110 to make full use of the space.
  • the temperature of the exhaust gas in the mixer 110 can continuously heat the catalytic disc 140 set on its outer periphery, which can obviously solve the temperature drop.
  • the resulting catalytic reaction conversion efficiency is low.
  • the length of the entire aftertreatment system 100 can also be shortened, which can also reduce the temperature loss.
  • the urea spray is not easy to crystallize at a relatively high temperature, which is more conducive to improving the overall aftertreatment system.
  • the service life of the processing system 100 is not easy to crystallize at a relatively high temperature, which is more conducive to improving the overall aftertreatment system.
  • this embodiment optimizes the flow direction of the exhaust gas. Compared with the traditional linear discharge method, this embodiment adopts the reentrant discharge method, which reduces the length of the entire post-treatment system 100 and achieves a high degree of integration. The heat dissipation area is relatively low, and the heat loss is small, which can accelerate the catalytic effect.
  • the mixing section of this embodiment is provided with the mixing chamber 150 located at the rear end of the catalytic disk 140, the mixing path can be extended to ensure that the urea spray and exhaust gas are fully mixed, and the uniformity of urea is improved.
  • the catalytic disk 140 is arranged at the front end of the mixing chamber 150, that is to say, the catalytic disk 140 is closer to the inlet end of the mixer 110 relative to the mixing chamber 150, so that the insufficiently mixed urea spray and exhaust gas are not directly due to inertia.
  • the relationship directly enters the catalytic disc 140, which is not conducive to the full implementation of the reaction.
  • the catalytic disc 140 is located at the front end of the mixing chamber 150, and will return to the catalytic disc 140 only after the urea spray and exhaust gas are fully mixed, and the mixing efficiency is higher. High, and can reduce the temperature drop due to the formation of the preheating pipeline for the catalytic disk 140, and realize the improvement of the conversion efficiency. Moreover, the catalytic disk 140 is located in the middle section of the mixer 110, and the space is small, and the heat loss of the urea spray and the exhaust gas mixture without turbulence in the mixing section is small, which is beneficial to preheating the catalytic disk 140 and ensuring the catalytic efficiency.
  • the urea nozzle 120 is arranged perpendicular to the inlet joint of the mixer 110, and radially extends into the mixer 110 from the outside.
  • the air pressure is relatively large, which can improve the mixing effect with the urea spray.
  • the present application does not limit the structural form of the mixer 110.
  • the mixer 110 is a straight cylindrical structure with the same diameter of the inlet port and the outlet port, which is easy to assemble, and is beneficial to control the volume, making the whole machine The shape is more compact.
  • a return air channel is formed between the outer periphery of the mixer 110 and the inner wall of the housing 130, and the air outlet 131 is arranged near the end of the return air channel, that is, the air outlet 131 is relatively close to the inlet of the mixer 110. Air end settings.
  • the end of the return air passage is close to the inlet joint of the mixer 110, so that the return air passage can cover most of the pipelines of the mixer 110, and only the inlet joint part of the mixer 110 is in an independent exposed state, so that
  • the temperature loss of the mixer 110 is minimized, and because the mixed gas of exhaust gas and urea spray in the return air channel also has a certain temperature, it can play a role of heat preservation for the subsequent exhaust gas entering from the intake joint, further The temperature loss is reduced, good reaction conditions are provided for the sufficient mixing of subsequent exhaust gas and urea spray and the use of catalysts, and the conversion efficiency of the aftertreatment system 100 is improved.
  • the return air channel is parallel to the direction of the air channel of the mixer 110 .
  • the mixing section includes a mixing tube and swirl holes arranged in the circumferential direction of the mixing tube, each swirl hole is provided with a swirl piece 111 with a certain opening and closing angle, and the swirl pieces 111 are evenly distributed on the circumference of the swirl tube In this direction, the swirl fins 111 are used to form a strong swirling airflow.
  • the shaft end of the mixing tube is open, so that it cooperates with the swirl hole opening in the circumferential direction.
  • the air flow is divided into two parts, one part flows out from the circumferential swirl hole, and the other part flows out from the axial opening. Flow, improve the mixing efficiency of urea spray and exhaust gas.
  • the mixing section includes a mixing tube and a plurality of axial fan blades arranged inside the mixing tube, the axial end of the mixing tube is open, and the axial flow fan blades are used to guide the urea spray and exhaust The mixed air flow of the exhaust gas flows, thereby improving the mixing efficiency of the urea spray and the exhaust gas.
  • the housing 130 is provided with an arc-shaped bottom bowl structure towards the gas outlet of the mixer 110 to guide the air flow back to the return air channel.
  • the curved bottom bowl of the housing 130 is semicircular, and the mixed flow of urea spray and exhaust gas flows out from the shaft end opening of the mixer 110 and then rushes towards the curved bottom bowl.
  • the surface can form a reverse guide for the airflow, turn the airflow back and guide it to the catalytic disc 140, improve the return efficiency, and facilitate the rapid discharge of the airflow.
  • the reentrant airflow can form turbulent flow in the radially outflowing airflow at the swirl hole, thereby improving the mixing effect of the urea spray and the exhaust gas.
  • the catalytic disc 140 is disposed near one end of the inlet connection of the mixer 110 . Considering that the exhaust gas will still lose heat with the change of the length of the air passage, setting the catalytic disk 140 at the end close to the inlet joint of the mixer 110 can make the catalytic reaction at the position where the heat loss is the smallest.
  • the exhaust gas and urea spray enter the mixer 110 from the intake joint, they can heat the catalytic disc 140, but if the catalytic disc 140 is set relatively backward, part of the heat will still be lost.
  • exhaust gas and urea spray can be supplied to the catalytic disc 140 from the intake joint with minimal heat loss, and the catalytic disc 140 is continuously heated in the mixer 110 heating to improve catalytic efficiency and conversion efficiency.
  • the catalytic disc 140 is in sealing connection with the inner wall of the casing 130 and the outer wall of the mixer 110 respectively. By sealingly connecting the catalytic disc 140 with the inner wall of the casing 130 and the outer wall of the mixer 110, the mixed flow of exhaust gas and urea spray can all pass through the catalytic disc 140, thereby improving the catalytic efficiency.
  • the catalytic disk 140 is a metal annular carrier or a ring-shaped ceramic cordierite carrier, which can adapt to long-term high-temperature working environment, and the carrier has better stability.
  • the shape of the carrier can be plate surface or honeycomb, and the carrier is coated with copper base Molecular sieve SCR catalyst or vanadium-based SCR catalyst coating.
  • the copper-based molecular sieve SCR catalyst can have a good catalytic effect on NO x and can produce a large amount of N 2 O, while the vanadium-based SCR catalyst coating can gradually improve its catalytic performance with the increase of temperature under high temperature conditions. Thermal performance is better.
  • This application does not limit the hole type arrangement of the porous plate 113, it is preferably arranged in an array, such as radially distributed with the center of the porous plate 113 as the center of the circle, and at the same time, the diameter and distribution of the holes are calculated according to the fluid simulation Adjust the design to optimize the mixing effect.
  • a perforated plate 113 is positioned adjacent to the inlet connection.
  • the exhaust gas and urea spray can be guided earlier, the mixed gas can be dispersed and drained, and the catalytic disc 140 located on the outer periphery of the middle section of the mixer 110 can be preheated.
  • the engine exhaust gas comes out of the turbocharger body, it directly enters the after-treatment air inlet, and the urea is sprayed into the intake pipe from the urea nozzle, and the urea and exhaust gas enter the mixer, pre-mixed through the perforated plate, and pass through a section of pipeline.
  • the ring catalyst from the swirl plate structure at the end of the mixer, carry out SCR reaction to remove NO x in the exhaust gas, and enter the exhaust pipe behind from the gas outlet.
  • the post-processing system of the present invention is integrated with the turbocharger, has a compact structure, makes full use of the space of the engine body, and couples the post-processing system behind the turbocharger as tightly as possible to minimize exhaust gas temperature loss and improve catalyst conversion efficiency.
  • the catalyst is a metal ring carrier or a ring ceramic cordierite carrier, which is coated with a copper-based molecular sieve SCR catalyst or a vanadium-based SCR catalyst coating, and converts NO x in the exhaust gas into N 2 and H 2 O with NH 3 as a reducing agent.
  • an engine including the aforementioned supercharger assembly.
  • a supercharger assembly disclosed in the foregoing embodiments has the above-mentioned technical effects
  • the engine of this embodiment also has all the above-mentioned technical effects, which will not be repeated here.
  • the present invention can also apply the engine disclosed in the above embodiments to an automobile, that is, an automobile including an engine as described above.
  • an automobile that is, an automobile including an engine as described above.
  • the engine disclosed in the foregoing embodiments has the above-mentioned technical effects
  • the automobile of this embodiment also has all the above-mentioned technical effects, which will not be repeated here.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Exhaust Gas After Treatment (AREA)

Abstract

一种超紧凑后处理***、增压器组件及发动机，超紧凑后处理***包括设有进气接头以连接增压器本体的混合器，连接于进气接头的尿素喷嘴，套设于部分混合器外周的壳体，设置于壳体内的催化盘，壳体设有出气口，催化盘设置于混合器和壳体内壁之间，并套设于混合器外周，催化盘将壳体内腔分隔为混合腔和回气腔，壳体的出气口设置于回气腔，混合器的出气端设有混合段，且混合段设置于混合腔。本发明充分利用尾气温度，提高后处理***转换效率。混合段设置位于催化盘后端的混合腔，可延长混合路径，保证充分混合，提升了尿素均匀性，并能够因形成对催化盘的预热管路，实现转换效率的提升。

Description

一种超紧凑后处理***、增压器组件及发动机
本申请要求于2022年1月10日提交中国专利局、申请号为202210022689.2、发明名称为“一种超紧凑后处理***、增压器组件及发动机”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及汽车发动机技术领域，具体涉及一种超紧凑后处理***、增压器组件及发动机。
背景技术
后处理***指能够将柴油机尾气中的污染物处理成二氧化碳、氮气和水等的催化转化器，由催化剂、喷射***、混合器及封装结构等组成。
随着排放法规不断升级，对柴油机后处理***的要求越来越高，随之带来的技术挑战越来越大，后处理***升级及发动机端对排放控制需进一步技术升级，以应对未来国七排放法规要求。
现有后处理***一般布置在整车车架上，即排气从发动机端涡轮增压器出来，通过较长的排气管道(约2-3米)，才能进入后处理催化器，受到排气管道的长度影响，排气管道外露会对排气形成散热效果，有20-60℃温降，因此影响后处理催化剂的转换效率。
因此，如何避免或降低因排气管路的温降对催化剂的转换效率产生的影响，是本领域技术人员亟待解决的技术问题。
发明内容
为了解决现有技术中的一个或多个技术问题，或至少提供一种有益的选择，本发明提供一种超紧凑后处理***，能提前布置，避免排气管路带来的温降，从而最大限度的提升后处理催化剂的转换效率。此外，本发明还公开了一种应用该超紧凑后处理***的增压器组件。此外，本发明还公开了一种应用该增压器组件的发动机。
本发明公开的一种超紧凑后处理***，包括
设有进气接头以连接增压器本体的混合器；
连接于所述进气接头的尿素喷嘴；
套设于部分所述混合器外周的壳体，所述壳体设有出气口；
设置于所述壳体内的催化盘，所述催化盘设置于所述混合器和所述壳体内壁之间，并套设于所述混合器外周，所述催化盘将所述壳体内腔分隔为混合腔和回气腔；
所述壳体的出气口设置于所述回气腔，所述混合器的出气端设有混合段，且所述混合段设置于所述混合腔。
作为一种超紧凑后处理***的优选技术方案，所述混合器外周与所述壳体内壁之间形成回气通道，所述出气口靠近所述回气通道末端设置。
作为一种超紧凑后处理***的优选技术方案，所述壳体朝向所述混合器出气端设置弧面底碗结构，以引导气流折返至所述回气通道。
作为一种超紧凑后处理***的优选技术方案，所述催化盘设置于靠近所述混合器进气接头的一端。
作为一种超紧凑后处理***的优选技术方案，所述催化盘分别与所述壳体内壁、混合器外壁密封连接。
作为一种超紧凑后处理***的优选技术方案，所述催化盘为金属环形载体或者环形陶瓷堇青石载体，载体涂覆有铜基分子筛SCR催化剂或钒基SCR催化剂涂层。
作为一种超紧凑后处理***的优选技术方案，所述混合器包括主管体和多孔板，所述多孔板垂直于所述主管体的内壁设置。
作为一种超紧凑后处理***的优选技术方案，所述多孔板靠近进气接头设置。
本发明还公开一种增压器组件，所述增压器组件包括增压器本体和如前所述的一种超紧凑后处理***，所述增压器本体设置增压出口，所述增压出口与超紧凑后处理***的进气接头连接。
本发明还公开一种发动机，包括如前所述的一种增压器组件。
由于采用了上述技术方案，本发明公开的一种超紧凑后处理***及应用的增压器组件，具有如下有益效果：
(1)本发明提出了一种新型的超紧凑的后处理***，能够与增压器本体集成，由于省略了排气管道，排气温度不会再从排气管道上散失，充分降低了尾气温度损失，充分利用尾气温度，为后续催化剂的使用提供良好 的反应条件，提高后处理***转换效率。
(2)本发明通过催化盘将壳体内腔分隔为混合腔和回气腔，尾气排气至混合腔能够保证与尿素喷雾的充分反应，再由混合腔经过催化盘进入回气腔，在经过催化盘时将尾气中的CO和NO x转化为转化CO 2、N 2和H 2O，完成尾气的后处理。催化盘采用环形结构，套在混合器的外侧，充分利用空间，混合器中的尾气温度可对套设在其外周的催化盘起到持续的加温作用，可明显解决温降导致的催化反应转换效率低的问题。此外，由于混合腔和回气腔还在外部包裹混合器，也都能起到保温的作用，降低尾气排气过程中的热量损失，保证催化过程温度的稳定性，从而提高后处理***的转换效率。
(3)本发明将尾气排气的流向进行了优化，相较于传统的线性排放方式，本发明采用折返式的排放方式，降低了整个后处理***的长度，实现高度集成化，散热面积相对较低，热量流失较少，可起到加速催化的效果。
(4)本发明中的混合器包括设置在出气端的混合段，混合段设置位于催化盘后端的混合腔，可延长混合路径，保证充分混合，提升了尿素均匀性，并能够因形成对催化盘的预热管路，减小温降，实现转换效率的提升。
(5)本发明提出了一种紧耦合用后处理混合器，充分利用空间，提升尿素混合均匀性。该混合器由多孔板、一定长度的主管体和混合段组成，最大限度延长了尿素与尾气的混合距离。其中，多孔板上为一定数量一定直径大小的孔，以提高混合效率，保证充分混合，减少结晶风险。
附图说明
此处所说明的附图用来提供对本发明的进一步理解，构成本发明的一部分，本发明的示意性实施例及其说明用于解释本发明，并不构成对本发明的不当限定。在附图中：
图1为本发明一实施例中一种超紧凑后处理***的结构示意图。
图2为本发明一实施例中一种增压器组件的结构示意图。
附图标记说明：
100-后处理***，110-混合器，111-旋流片，112-主管体，113-多孔板，120-尿素喷嘴，130-壳体，131-出气口，140-催化盘，150-混合腔，160-回 气腔，200-增压器本体。
具体实施方式
为了更清楚的阐释本发明的整体构思，下面再结合说明书附图以示例的方式进行详细说明。
需说明，在下面的描述中阐述了很多具体细节以便于充分理解本发明，但是，本发明还可以采用其他不同于在此描述的其他方式来实施，因此，本发明的保护范围并不受下面公开的具体实施例的限制。
另外，在本发明的描述中，需要理解的是，术语“中心”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”、“轴向”、“径向”、“周向”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本发明和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本发明的限制。
在本发明中，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”、“固定”等术语应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或成一体；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通或两个元件的相互作用关系。但注明直接连接则说明连接的两个主体之间并不通过过渡结构构建连接关系，只通过连接结构相连形成一个整体。对于本领域的普通技术人员而言，可以根据具体情况理解上述术语在本发明中的具体含义。
在本发明中，除非另有明确的规定和限定，第一特征在第二特征“上”或“下”可以是第一和第二特征直接接触，或第一和第二特征通过中间媒介间接接触。在本说明书的描述中，参考术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本发明的至少一个实施例或示例中。在本说明书中，对上述术语的示意性表述不必须针对的是相同的实施例或示例。而且，描述的具体特征、结构、材料或者特点可以在任一个或多个实施例或示例中以合适的方式结合。
具体采取的方案是：
参见图1、图2，本发明公开的一种超紧凑后处理***100，包括混合器110、尿素喷嘴120、壳体130和催化盘140。其中，尿素喷嘴120用于连接外部尿素喷射***，尿素喷射***用于提供尿素源，应用于选择性催化还原技术中。选择性催化还原***的主要零件有尿素泵、尿素喷嘴120、还原催化器、氮氧化物传感器、温度传感器、尿素线和尿素罐等。它的基本工作原理是：柴油发动机根据发动机的工况和其它相关条件给尿素泵发出喷射尿素指令，尿素泵将尿素溶液从尿素罐里抽出并经过喷嘴喷到排气管里，尿素溶液在排气管里转化成氨，将氮氧化物变成氮气和水。尿素液滴通过尿素喷嘴120均匀喷洒，可与尾气废气充分混合。
混合器110是对尿素喷嘴120喷射出的尿素水溶液进行雾化分解及与柴油机排气进行混合的部件。混合器110具有进气端和出气端，进气端设有进气接头，进气接头用于连接增压器本体200，由增压器本体200排出的尾气废气从进气接头进入混合器110，并与尿素喷雾实现混合接触；以图1所示视角来说，混合器110的左端为进气端。
壳体130套设于部分混合器110的外周，且壳体130设有出气口131。具体而言，壳体130套设在混合器110与进气端相对的出气端，且仅靠近进气端的部分处于外露状态，外露的部分至少包括进气接头，以便于增压器进行连接。混合器110其余部分则伸入壳体130中形成混合路径；也就是说，混合器110的靠近进气端的部分露出壳体130外，进气接头也露出壳体130外，混合器110的其他部分位于壳体130内，与壳体130之间形成相对封闭的空间，该相对封闭的空间通过壳体130的出气口131与外界连通；如图1所示，尿素喷嘴120也露在壳体130外，方便与尿素泵等相关部件连接。
催化盘140设置于壳体130内，催化盘140设置于混合器110和壳体130内壁之间，并套设于混合器110外周，催化盘140将壳体130内腔分隔为混合腔150和回气腔160，其中混合腔150相对回气腔160靠近混合器110的出口端，混合器110的出口端与回气腔160连通，可以理解，此处的混合腔150和回气腔160为上述形成在壳体130和混合器110之间的相对封闭的空间，该相对封闭的空间被催化盘140分隔成混合腔150和回气腔160。排气尾气与尿素喷雾混合后，从混合器110的出口端排出至混 合腔150，再从混合腔150进入催化盘140，经过催化盘140催化，加速将废气(尤其是二氧化硫及其他有害气体)还原，并折返进入回气腔160。
壳体130的出气口131设置于回气腔160，进入回气腔160的气体从出气口131排出。
本实施例中，混合器110的出气端设有混合段，且混合段设置于混合腔150。
现有技术中的后处理***，布置在整车车架上，排气尾气从发动机端涡轮增压器出来，通过较长的排气管道，才能进入后处理***进行混合催化，在排气管道阶段因管道外露产生20℃到60℃的温降，后处理催化过程中也会因温度降低幅度过大而影响催化剂的转换效率。本实施例公开的一种新型的超紧凑的后处理***100，能够与增压器本体200集成，由于省略了排气管道，排气温度不会再从排气管道上散失，充分降低了尾气温度损失，从而充分利用尾气温度，为后续催化剂的使用提供良好的反应条件，提高后处理***100转换效率。本实施例还利用催化盘140将壳体130内腔分隔为混合腔150和回气腔160，尾气排气至混合腔150能够保证与尿素喷雾的充分反应，再由混合腔150经过催化盘140进入回气腔160，在经过催化盘140时将尾气中的CO和NO x转化为转化CO 2、N 2和H 2O，完成尾气的后处理。
催化盘140采用环形结构，套在混合器110的外侧，充分利用空间，混合器110中的尾气温度可对套设在其外周的催化盘140起到持续的加温作用，可明显解决温降导致的催化反应转换效率低的问题。尿素喷雾与排气尾气的混合过程中，也能够由于缩短了整个后处理***100的长度，同样起到减少温度损失的作用，尿素喷雾在相对高的温度下不易产生结晶，更利于提高整个后处理***100的使用寿命。
此外，由于混合腔150和回气腔160还在外部包裹混合器110，也都能起到保温的作用，降低尾气排气过程中的热量损失，保证催化过程温度的稳定性，从而提高后处理***100的转换效率。进一步的，本实施例将尾气排气的流向进行了优化，相较于传统的线性排放方式，本实施例采用折返式的排放方式，降低了整个后处理***100的长度，实现高度集成化，散热面积相对较低，热量流失较少，可起到加速催化的效果。
尤为重要的是，由于本实施例的混合段设置位于催化盘140后端的混合腔150，可延长混合路径，保证尿素喷雾和排气尾气充分混合，提升了尿素均匀性，相较于直接混合催化的方式，催化盘140设置在混合腔150的前端，也就是说，催化盘140相对混合腔150更靠近混合器110的进口端，可避免未充分混合的尿素喷雾和排气尾气直接由于惯性的关系直接进入催化盘140，不利于反应的充分实施，也就是说，催化盘140位于混合腔150的前端，仅当尿素喷雾和排气尾气充分混合后才会折返回催化盘140，混合效率更高，并能够因形成对催化盘140的预热管路，减小温降，实现转换效率的提升。而且催化盘140位于混合器110的中段部分，空间较小，未经混合段紊流的尿素喷雾和排气尾气混合气体热量损失小，利于对催化盘140进行预热，保证催化效率。
本申请对尿素喷头的具体形态和设置位置不做限定，在一个实施例中，参见图1，尿素喷嘴120垂直于混合器110的进气接头设置，并从外部沿径向伸入混合器110的进气接头，在排气尾气通过增压器本体200的出口进入混合器110时，气压相对较大，可提高与尿素喷雾的混合效果。
本申请对混合器110的结构形态不做限定，在一个实施例中，参见图1，混合器110为进气端和出气端口径相同的直筒结构，便于装配，且利于控制体积，使整机形态更加紧凑。
参见图1，为了提高催化盘140的转换效率，混合器110外周与壳体130内壁之间形成回气通道，出气口131靠近回气通道末端设置，即出气口131相对靠近混合器110的进气端设置。回气通道末端靠近混合器110的进气接头，从而回气通道可将混合器110的大部分的管路都包覆在内，混合器110仅进气接头部分处于独立的外露状态，从而使得混合器110的温度损失降到最低，而且由于回气通道内排气尾气和尿素喷雾的混合气体也具有一定的温度，可对后续从进气接头进入的排气尾气起到保温的作用，进一步降低温度损失，为后续排气尾气和尿素喷雾的充分混合以及催化剂的使用提供良好的反应条件，提高后处理***100转换效率。
为了进一步实现后处理混合器110的紧凑性，在一个实施例中，参见图1，回气通道平行于混合器110的气道方向。
本申请对混合段的结构不做具体限定，其可以采用但不限于下述具体 实施方式中的任一种：
实施方式一
参见图1，混合段包括混合管和设置于混合管周向的旋流孔，各旋流孔上设置具有一定开合角度的旋流片111，旋流片111均布于旋流管的周向，旋流片111用于形成强烈的旋转气流。混合管的轴端为开口状态，从而与周向开口的旋流孔配合，气流分为两部分，一部分从周向的旋流孔流出，一部分从轴向的开口流出，两部分气流利于形成紊流，提高尿素喷雾和排气尾气的混合效率。
实施方式二
在一种未图示的实施例中，混合段包括混合管和设置于混合管内部的多个轴流扇叶，混合管的轴端为开口状态，利用轴流扇叶引导尿素喷雾和排气尾气的混合气流流向，从而提高尿素喷雾和排气尾气的混合效率。
进一步的，为了提高催化效率，加速排气尾气和尿素喷雾的折返速率，壳体130朝向混合器110出气端设置弧面底碗结构，以引导气流折返至回气通道。具体的，壳体130的弧面底碗呈半圆形，尿素喷雾和排气尾气的混合气流从混合器110的轴端开口流出后，冲向弧面底碗，利用弧面底碗的弧面可形成对气流的反向引导，将气流折返并引导至催化盘140，提高折返效率，利于气流快速排出。结合前述实施例，折返的气流可在旋流孔处径向流出的气流形成紊流，从而提高尿素喷雾和排气尾气的混合效果。
在一个实施例中，参见图1，催化盘140设置于靠近混合器110进气接头的一端。考虑到排气尾气仍会随着气道长度的变化而产生热量散失的问题，将催化盘140设置在靠近混合器110进气接头的一端可使催化反应在热量散失最小的位置，当排气尾气和尿素喷雾从进气接头进入混合器110时，即可对催化盘140起到加热的作用，而如果将催化盘140设置的相对靠后，热量仍会损失一部分，本实施例通过壳体130在催化盘140后端围成回气腔160，排气尾气和尿素喷雾从进气接头能够以极小的热量损失供给至催化盘140，并在混合器110内就对催化盘140进行持续的加热，以提高催化效率和转换效率。
在一个实施例中，催化盘140分别与壳体130内壁、混合器110外壁密封连接。通过将催化盘140和壳体130内壁、混合器110外壁密封连接， 可使排气尾气和尿素喷雾的混合气流全部通过催化盘140，提高催化效率。
在一个实施例中，催化盘140为金属环形载体或者环形陶瓷堇青石载体，能够适应长期的高温工作环境，载体稳定性更好，载体形态可以为板面或蜂窝状，载体涂覆有铜基分子筛SCR催化剂或钒基SCR催化剂涂层。
铜基分子筛SCR催化剂能够对NO x起到良好的催化效果，能够产生大量的N 2O，而钒基SCR催化剂涂层则能够在高温条件下随着温度的升高其催化性能逐渐提升，耐热性能更好。
在一个实施例中，参见图1，混合器110包括主管体112和多孔板113，多孔板113垂直于主管体112的内壁设置。多孔板113一方面可以起到消声的作用，降低工况噪音，另一方面，可以提高对尿素喷雾的破碎效果，由于多孔板113上的通孔是均匀布置的，可以引导气流沿通孔的排布均匀流出，便于混合均匀。本申请未对多孔板113的孔型排布做限定，其优选采用阵列排布的方式，如以多孔板113的中心为圆心呈放射状分布的方式，同时，孔的直径及分布根据流体仿真计算进行调整设计，以优化混合效果。
在一个实施例中，参见图1，多孔板113靠近进气接头设置。通过将多孔板113设置在进气接头附近，可较早的对排气尾气和尿素喷雾进行气流引导，并将混合气体分散引流，并对位于混合器110中段外周的催化盘140进行预热。
参见图2，本发明一个实施例中，还公开了一种增压器组件，增压器组件包括增压器本体200和如前的一种超紧凑后处理***100，增压器本体200设置增压出口，增压出口与超紧凑后处理***100的进气接头连接，在前述实施例公开的一种超紧凑后处理***100具有上述技术效果的前提下，本实施例的增压器组件也具有上述所有技术效果，在此不再赘述。
本发明的工作过程如下：
发动机排气尾气从涡轮增压器本体出来后，直接进入后处理进气口，尿素从尿素喷嘴喷入进气管道，尿素与尾气进入混合器，经过多孔板进行预混合，经过一段管路，从混合器尾端的旋流片结构进入环形催化剂，进行SCR反应去除尾气中NO x，从出气口进入后面的排气管路。
本发明后处理***与涡轮增压器集成，结构紧凑，充分利用发动机本体空间，将后处理***尽可能紧耦合在增压器后，最大限度降低尾气温度 损失，提升催化剂转换效率。催化剂为金属环形载体或者环形陶瓷堇青石载体，上面涂覆有铜基分子筛SCR催化剂或钒基SCR催化剂涂层，在NH 3作为还原剂下将尾气中NO x转化为N 2和H 2O。
本发明一个实施例中，还公开一种发动机，包括如前所述的一种增压器组件。在前述实施例公开的一种增压器组件具有上述技术效果的前提下，本实施例的发动机也具有上述所有技术效果，在此不再赘述。
本领域技术人员可以理解的是，本发明还能够将上述实施例公开的发动机应用在汽车上，即一种汽车，包括如前所述的一种发动机。在前述实施例公开的一种发动机具有上述技术效果的前提下，本实施例的汽车也具有上述所有技术效果，在此不再赘述。
本发明所保护的技术方案，并不局限于上述实施例，应当指出，任意一个实施例的技术方案与其他一个或多个实施例中技术方案的结合，在本发明的保护范围内。虽然，上文中已经用一般性说明及具体实施例对本发明作了详尽的描述，但在本发明基础上，可以对之作一些修改或改进，这对本领域技术人员而言是显而易见的。因此，在不偏离本发明精神的基础上所做的这些修改或改进，均属于本发明要求保护的范围。

Claims (10)

  1. 一种超紧凑后处理***，其特征在于，包括
    设有进气接头以连接增压器本体的混合器；
    连接于所述进气接头的尿素喷嘴；
    套设于部分所述混合器外周的壳体，所述壳体设有出气口；
    设置于所述壳体内的催化盘，所述催化盘设置于所述混合器和所述壳体内壁之间，并套设于所述混合器外周，所述催化盘将所述壳体内腔分隔为混合腔和回气腔；
    所述壳体的出气口设置于所述回气腔，所述混合器的出气端设有混合段，且所述混合段设置于所述混合腔。
  2. 根据权利要求1所述的一种超紧凑后处理***，其特征在于，所述混合器外周与所述壳体内壁之间形成回气通道，所述出气口靠近所述回气通道末端设置。
  3. 根据权利要求2所述的一种超紧凑后处理***，其特征在于，所述壳体朝向所述混合器出气端设置弧面底碗结构，以引导气流折返至所述回气通道。
  4. 根据权利要求1所述的一种超紧凑后处理***，其特征在于，所述催化盘设置于靠近所述混合器的进气接头的一端。
  5. 根据权利要求1所述的一种超紧凑后处理***，其特征在于，所述催化盘分别与所述壳体内壁、所述混合器外壁密封连接。
  6. 根据权利要求1所述的一种超紧凑后处理***，其特征在于，所述催化盘为金属环形载体或者环形陶瓷堇青石载体，载体涂覆有铜基分子筛SCR催化剂或钒基SCR催化剂涂层。
  7. 根据权利要求1所述的一种超紧凑后处理***，其特征在于，所述混合器包括主管体和多孔板，所述多孔板垂直于所述主管体的内壁设置。
  8. 根据权利要求7所述的一种超紧凑后处理***，其特征在于，所述多孔板靠近所述混合器的进气接头设置。
  9. 一种增压器组件，其特征在于，所述增压器组件包括增压器本体和如权利要求1-8任一项所述的一种超紧凑后处理***，所述增压器本体设置增压出口，所述增压出口与所述超紧凑后处理***的进气接头连接。
  10. 一种发动机，其特征在于，包括如权利要求9所述的一种增压器组件。
PCT/CN2023/071532 2022-01-10 2023-01-10 一种超紧凑后处理***、增压器组件及发动机 WO2023131337A1 (zh)

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