CN213235178U

CN213235178U - A kind of aftertreatment catalytic muffler and aftertreatment system

Info

Publication number: CN213235178U
Application number: CN202021232569.8U
Authority: CN
Inventors: 张建华; 宋勃震
Original assignee: Weichai Power Co Ltd; Weichai Power Emission Solutions Technology Co Ltd
Current assignee: Weichai Power Co Ltd; Weichai Power Emission Solutions Technology Co Ltd
Priority date: 2020-06-29
Filing date: 2020-06-29
Publication date: 2021-05-18
Anticipated expiration: 2030-06-29

Abstract

The utility model discloses an after-treatment catalytic muffler and an after-treatment system, comprising a guide air channel arranged on the inner wall of an after-treatment pipeline upstream of an SCR module and arranged at an installation position of a urea nozzle, the guide air channel comprising an air inlet and a urea nozzle. The air outlet, the air inlet is located on the windward side of the post-processing pipeline, the air outlet faces the injection path of the urea nozzle, and the air outlet and the extension direction of the post-processing pipeline are arranged at a preset angle. In the post-treatment catalytic muffler, the air flow out through the air outlet will have a lateral impact on the urea spray ejected from the urea nozzle, and then under the combined action of the main air flow in the post-treatment pipeline and the air flow out of the air outlet, the urea spray on the urea injection path will be affected. The spray collision is more intense, so that the particle size of the urea spray can be more effectively reduced, the droplet velocity of the urea spray can be reduced, and the penetration distance of the urea spray can be reduced, which can effectively reduce the risk of urea crystallization.

Description

Aftertreatment catalytic muffler and aftertreatment system

Technical Field

The utility model relates to an engine aftertreatment technical field especially relates to a aftertreatment catalysis silencer and aftertreatment system.

Background

The SCR catalytic reduction technology is used for reducing NO of diesel engine_XAnd (4) emission, which meets the important technical route of the national V and above emission regulations. One of the most typical failure modes of the aftertreatment SCR module in the market application process is urea crystallization, which can block an aftertreatment catalytic muffler of a diesel engine, so that exhaust back pressure rises, oil consumption of the diesel engine rises, and a vehicle cannot run under severe conditions.

The working mode of the aftertreatment catalytic muffler is generally as shown in fig. 1, the exhaust enters from an inlet end 1a, passes through a DOC module 2 and a DPF module 3 in sequence, then a mixer 5 is arranged in front of an SCR module 4, urea spraying uniformity is improved and urea crystallization is prevented through the mixer 5, a urea nozzle 6 is generally installed at the upstream of the mixer 5, and the exhaust is finally discharged from an exhaust end 1b after passing through the SCR module 4.

The current structural form of the post-treatment catalytic silencer cannot improve the spray particle size of urea spray, the urea spray is easily sprayed on the inner wall of a pipeline or a mixer, and urea crystals are easily generated when the urea spray particle size is too large and urea collides the wall.

In conclusion, how to solve the problem that urea crystallization is easily generated in the post-treatment catalytic muffler has become a technical problem that needs to be solved urgently by the technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a aftertreatment catalytic muffler and aftertreatment system to solve aftertreatment catalytic muffler and produce the problem of urea crystallization easily.

In order to achieve the above object, the utility model provides an aftertreatment catalytic muffler, including setting up on the inner wall of the aftertreatment pipeline in the SCR module upper reaches and arranging the air guide runner at the mounted position of urea nozzle, the air guide runner includes air inlet and gas outlet, the air inlet is in windward side in the aftertreatment pipeline, the gas outlet orientation the injection route of urea nozzle, just the gas outlet with the extending direction of aftertreatment pipeline is preset the angle and arranges.

Preferably, the number of the air outlets is two, and the air outlets are symmetrically distributed on two sides of a longitudinal section of an injection path of the urea nozzle.

Preferably, the gas guide flow channel is a cylindrical gas guide chamber which is arranged on the inner wall of the aftertreatment pipeline and arranged along the circumferential direction of the injection path, the gas inlet is arranged on the windward side of the outer annular wall of the cylindrical gas guide chamber in an open manner, and the gas outlet is arranged on the inner annular wall of the cylindrical gas guide chamber in a gas injection hole manner.

Preferably, the lower part of the inner annular wall of the annular cylindrical wind guide chamber is of a flaring structure from top to bottom.

Preferably, the preset angle is 90 °.

Preferably, the urea nozzle is fixed to the aftertreatment duct by a urea mount.

Preferably, the gas injection holes are slits.

Preferably, the slit is a cross slit.

Compared with the introduction content of the background technology, the aftertreatment catalytic muffler comprises an air guide flow channel which is arranged on the inner wall of an aftertreatment pipeline at the upstream of an SCR module and is arranged at the installation position of a urea nozzle, wherein the air guide flow channel comprises an air inlet and an air outlet, the air inlet is positioned on the windward side in the aftertreatment pipeline, the air outlet faces the injection path of the urea nozzle, and the air outlet and the extension direction of the aftertreatment pipeline are arranged at a preset angle. This aftertreatment catalysis silencer, in the practical application process, the air current in the aftertreatment pipeline of SCR module upper reaches is under the effect of direction air current, get into through the air inlet, then spout on the injection route of urea nozzle by the gas outlet, because the extending direction of gas outlet and aftertreatment pipeline is preset the angle and arranges, consequently, the air current of exporting through the gas outlet can produce horizontal striking to urea nozzle spun urea spraying, then under the combined action of aftertreatment pipeline main air current and gas outlet export air current, make the urea spraying on the urea injection route collide more fiercely, thereby can reduce urea spraying particle diameter more effectively, reduce the drop velocity of urea spraying, reduce the penetration distance of urea spraying, then can effectively reduce the risk of urea crystallization.

Additionally, the utility model also provides an aftertreatment system, including aftertreatment catalytic muffler, this aftertreatment catalytic muffler is the aftertreatment catalytic muffler that any scheme described above. Since the aftertreatment catalytic muffler has the above technical effects, an aftertreatment system having the aftertreatment catalytic muffler should also have corresponding technical effects, which are not described herein again.

Drawings

FIG. 1 is a schematic structural view of a conventional aftertreatment catalytic muffler;

FIG. 2 is a schematic diagram of a schematic structure of an aftertreatment catalytic muffler according to an embodiment of the present invention;

FIG. 3 is a schematic sectional view A-A of FIG. 2;

FIG. 4 is a schematic cross-sectional view B-B of FIG. 2;

fig. 5 is a schematic top view of the ring-shaped wind guiding chamber in the post-treatment according to an embodiment of the present invention.

In the above-described figures 1-5,

the device comprises an air inlet end 1a, an air outlet end 1b, a DOC module 2, a DPF module 3, an SCR module 4, a mixer 5, a urea nozzle 6, an air guide flow channel 7, an air inlet 71, an air outlet 72, an injection path 8, a urea mounting seat 9 and an aftertreatment pipeline 10.

Detailed Description

The core of the utility model is to provide a aftertreatment catalysis silencer and aftertreatment system to solve the problem that aftertreatment catalysis silencer produces the urea crystallization easily.

In order to make those skilled in the art better understand the technical solutions provided by the present invention, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.

As shown in fig. 1-5, the embodiment of the present invention provides a post-treatment catalytic muffler, including setting up on the inner wall of the post-treatment pipeline 1 at the SCR module upstream and arranging the air guide flow channel 7 at the mounted position of the urea nozzle 6, the air guide flow channel 7 includes an air inlet 71 and an air outlet 72, the air inlet 71 is on the windward side in the post-treatment pipeline 1, the air outlet 72 faces the injection path 8 of the urea nozzle 6, and the air outlet 72 is arranged at a preset angle with the extending direction of the post-treatment pipeline 1.

This aftertreatment catalysis silencer, in the practical application process, the air current in the aftertreatment pipeline of SCR module upper reaches is under the effect of direction air current, get into through the air inlet, then spout on the injection route of urea nozzle by the gas outlet, because the extending direction of gas outlet and aftertreatment pipeline is preset the angle and arranges, consequently, the air current of exporting through the gas outlet can produce horizontal striking to urea nozzle spun urea spraying, then under the combined action of aftertreatment pipeline main air current and gas outlet export air current, make the urea spraying on the urea injection route collide more fiercely, thereby can reduce urea spraying particle diameter more effectively, reduce the drop velocity of urea spraying, reduce the penetration distance of urea spraying, then can effectively reduce the risk of urea crystallization.

In some specific embodiments, the number of the air outlets 72 may be two, and the two air outlets are symmetrically distributed on two sides of a longitudinal section of the injection path 8 of the urea injection nozzle 6. The air outlets 72 are respectively arranged on the two sides of the longitudinal section of the spraying path of the urea nozzle, so that air flow guided out of the air outlets 72 can generate convection impact effect on urea spraying, the collision of the urea spraying is more intense, the particle size of the urea spraying is effectively reduced, the droplet speed of the urea spraying is reduced, the penetration distance of the urea spraying is more effectively reduced, the probability that the urea collides with the wall can be reduced, and the risk of urea crystallization is further reduced.

In some more specific embodiments, the above-mentioned specific structure of the gas guide channel 7 may be designed such that the gas guide channel 7 is a cylindrical wind guide chamber disposed on the inner wall of the aftertreatment duct 10 and arranged along the circumferential direction of the injection path, the gas inlet 71 is disposed in an open manner on the windward side of the outer annular wall of the cylindrical wind guide chamber, and the gas outlet 72 is disposed in a gas injection hole manner on the inner annular wall of the cylindrical wind guide chamber. The air inlet is designed into an open form, so that as much tail gas as possible can pass through the annular columnar air guide chamber, and then the interference capability of the air outlet on urea spraying can be effectively enhanced by designing the air outlet into a spray hole. It can be understood that the above-mentioned structure of the air guiding chamber is only a preferred example of the structure of the air guiding flow channel, and in the practical application process, other structure forms can be adopted, for example, a special-shaped pipe fitting is arranged in the post-processing pipeline, the air inlet of the special-shaped pipe fitting is a bell mouth and is located on the windward side, the special-shaped pipe fitting has two air outlets, and the air outlet is a structure of an injection hole.

In some specific embodiments, the lower portion of the inner annular wall of the annular cylindrical wind guiding chamber is preferably designed to be a flaring structure from top to bottom. Through designing into flaring structure, can form certain dodging space to the urea spraying of urea nozzle spun, avoid the interior rampart to produce the direct interference effect of injection route production to urea spraying. The specific flaring structure size can be designed according to the injection path and the injection range of the urea nozzle.

It should be noted that the preset angle between the air outlet 72 of the diversion air duct 7 and the extending direction of the aftertreatment pipeline 1 may be 90 °. Through designing into 90 forms, when adopting the gas outlet form of bilateral symmetry arrangement, the convection current striking can be more obvious, does benefit to the breakage of urea spraying more, has reduced urea spraying particle diameter more effectively. It is understood that the above-mentioned form of designing the preset angle to be 90 ° is only a preferred example of the embodiment of the present invention, and in the practical application process, other angles may be selected according to the practical arrangement requirement, which is not limited in more detail herein.

Here, it should be noted that, in general, the urea nozzle 6 may be fixed to the aftertreatment duct by a urea mount 9. The urea nozzle is installed through the urea installation seat, so that the urea nozzle is more convenient to install and more stable. Due to the design of the urea mounting seat, a structure for forming the air guide flow channel is easier to design, for example, the annular columnar air guide chamber can be directly fixed with the urea mounting seat, and then the installation and the fixation are more convenient and faster.

In some more specific embodiments, the specific structural form of the gas injection holes can be selected to be a slit structure. Through designing into the slit structure, processing meeting on the one hand is more convenient, and on the other hand can also increase the interference range of the urea spraying of gas outlet on the injection route of urea nozzle. It should be understood that the above-mentioned air injection holes with slit structures are merely preferred examples of the embodiments of the present invention, and in practical applications, other injection holes may be selected as long as injection can be achieved.

In a further embodiment, the above-mentioned slits may be designed as cross slits in order to increase the range of influence of the injection from the injection holes as much as possible. Through designing into the cross slit, can make the injection hole to urea spraying on the injection route of urea nozzle can produce the striking effect at horizontal and longitudinal direction, effectual increase injection striking's influence range then.

It is right above that the utility model provides a aftertreatment catalytic muffler and aftertreatment system have carried out the detailed introduction. It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.

It is also noted that, in this document, terms such as "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in an article or device that comprises the element.

The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the core concepts of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims

1. The aftertreatment catalytic muffler is characterized by comprising an air guide flow channel (7) which is arranged on the inner wall of an aftertreatment pipeline (10) at the upstream of an SCR module and is arranged at the installation position of a urea nozzle (6), wherein the air guide flow channel (7) comprises an air inlet (71) and an air outlet (72), the air inlet (71) is positioned on the windward side in the aftertreatment pipeline (10), the air outlet (72) faces to an injection path (8) of the urea nozzle (6), and the air outlet (72) and the extension direction of the aftertreatment pipeline (10) are arranged at a preset angle.

2. The aftertreatment catalytic muffler of claim 1, wherein the number of the outlet ports (72) is two and symmetrically distributed on both sides of a longitudinal section of the injection path (8) of the urea nozzle (6).

3. The aftertreatment catalytic muffler according to claim 2, wherein the gas guide flow channel (7) is a cylindrical wind guide chamber disposed on an inner wall of the aftertreatment duct (10) and arranged in a circumferential direction of the injection path, the gas inlet (71) is disposed in an open manner on a windward side of an outer circumferential wall of the cylindrical wind guide chamber, and the gas outlet (72) is disposed in a gas injection manner on an inner circumferential wall of the cylindrical wind guide chamber.

4. The aftertreatment catalytic muffler of claim 3 wherein the lower portion of the inner annular wall of the annular cylindrical air deflection chamber is flared from top to bottom.

5. The aftertreatment catalytic muffler of claim 2, wherein the predetermined angle is 90 °.

6. Aftertreatment catalytic muffler according to any of claims 1-5, wherein the urea nozzle (6) is fixed to the aftertreatment duct by a urea mount (9).

7. The aftertreatment catalytic muffler of claim 3 wherein the gas injection holes are slits.

8. The aftertreatment catalytic muffler of claim 7 wherein the slots are cross slots.

9. An aftertreatment system comprising an aftertreatment catalytic muffler, wherein the aftertreatment catalytic muffler is in accordance with any one of claims 1-8.