CN214533158U

CN214533158U - Tightly-coupled post-processing device and engine

Info

Publication number: CN214533158U
Application number: CN202120067014.0U
Authority: CN
Inventors: 柴洋; 王意宝; 王东升; 胡晓艳
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2021-01-11
Filing date: 2021-01-11
Publication date: 2021-10-29
Anticipated expiration: 2031-01-11

Abstract

The utility model discloses a close coupling aftertreatment device belongs to engine aftertreatment technical field, the power distribution box comprises a box body, the blender, the catalyst carrier, including the antechamber and the rear chamber of mutual intercommunication in the box, the lateral wall of antechamber is equipped with waste gas entry and exhaust outlet, the mixing drum of blender and encirclement blender is arranged to the antechamber, the one end of mixing drum communicates in waste gas entry and other end intercommunication has the hybrid tube, at least two catalyst carriers have been arranged in parallel in the rear chamber, the one end of each catalyst carrier is arranged towards the antechamber and is formed mixed tail chamber between the lateral wall of other end and rear chamber, the hybrid tube extends and end opening in mixed tail chamber along the direction of keeping away from the antechamber, exhaust outlet is provided with the HC nozzle.

Description

Tightly-coupled post-processing device and engine

Technical Field

The utility model relates to an engine aftertreatment technical field especially relates to a close coupling aftertreatment device and engine.

Background

SCR (Selective Catalytic Reduction) is one of the major aftertreatment technologies for the elimination of nitrogen oxides from diesel exhaust. At present, the aftertreatment technology of the diesel engine generally meets the national six-emission requirement, and in order to meet the next stage, namely the higher national seven-emission requirement, the close coupling SCR double-injection technology becomes a necessary technical route for finishing the upgrading of the engine emission. The close-coupled SCR is an aftertreatment device disposed in the engine block as close as possible to the supercharger outlet.

The existing diesel engine tightly-coupled post-processing device is only suitable for light vehicles and passenger vehicles due to the barrel type structure, and cannot meet the requirement of more compact spatial arrangement of a medium-sized platform engine. In addition, existing close-coupled aftertreatment devices do not consider the arrangement of the regeneration device HC (hydrocarbon) injection system between the two close-couplings.

Therefore, how to provide a tightly coupled post-processing device that meets the requirement of more compact spatial arrangement is a technical problem that needs to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model aims at providing a close coupling aftertreatment device can satisfy compacter space arrangement demand, and integrated HC injection system satisfies the regeneration demand of back level close coupling simultaneously. Another object of the present invention is to provide an engine including the above tightly coupled post-processing device.

In order to achieve the above purpose, the utility model provides a following technical scheme:

the utility model provides a close coupling aftertreatment device, includes box, blender, catalyst carrier, including the ante-chamber and the back chamber that communicate each other in the box, the lateral wall of ante-chamber is equipped with waste gas entry and exhaust outlet, be arranged in the ante-chamber the blender with surround the mixing drum of blender, the one end of mixing drum communicate in waste gas entry and other end intercommunication have the hybrid tube, the intracavity parallel arrangement of back has at least two catalyst carrier, each the one end orientation of catalyst carrier the ante-chamber arrange and the other end with form the mixed tail chamber between the lateral wall of back chamber, the hybrid tube is along keeping away from the direction extension of ante-chamber and end opening in the mixed tail chamber, exhaust outlet is provided with the HC nozzle.

Preferably, the catalyst carriers are columnar structures, and the respective catalyst carriers are arranged in parallel.

Preferably, an axial direction of the mixing drum is arranged perpendicular to an axial direction of the catalyst carrier.

Preferably, each of the catalyst carriers is uniformly distributed on the circumferential outer side of the mixing pipe.

Preferably, the side wall of the mixing drum is disposed opposite to the front end of at least one of the catalyst carriers.

Preferably, an air outlet pipe is connected to the outer side of the exhaust gas outlet, a nozzle holder is fixed on the air outlet pipe, and the HC nozzle is arranged on the nozzle holder.

Preferably, the exhaust gas inlet and the exhaust gas outlet are provided on the same side wall of the front chamber.

Preferably, the mixing drum is provided with a urea nozzle at the mixer inlet.

Preferably, the mixer is a spinning disk mixer.

The utility model provides a tight coupling aftertreatment device's theory of operation as follows:

the exhaust gas discharged by the supercharger enters a mixing cylinder of a front cavity through an exhaust gas inlet, the urea nozzle sprays urea, the urea is mixed by a mixer and then is guided into a mixing tail cavity through a mixing pipe, the exhaust gas enters each catalyst carrier from the mixing tail cavity to be subjected to catalytic reduction, the exhaust gas after reaction is discharged into the front cavity from the front end of the catalyst carrier, and finally, when the exhaust gas is discharged through an exhaust gas outlet, the HC nozzle sprays hydrocarbon, so that a solution is provided for the regeneration of a rear-stage DOC-DPF-SCR assembly.

The utility model discloses following beneficial effect has:

1) in the scheme, in a compact box body space, an arrangement mode that two or more catalyst carriers are connected in parallel is adopted, so that the back pressure loss is reduced on the premise of reducing the nitrogen oxides in the exhaust gas, the post-treatment temperature of the front-stage SCR is effectively increased, and the conversion efficiency of the cold-state circulating catalyst is improved;

2) in the scheme, the HC nozzle is integrated at the exhaust gas outlet of the box body, so that the regeneration requirement of a DOC-DPF-SCR assembly at the later stage is met;

3) the exhaust gas flow after passing through the catalyst carrier in the scheme returns to the front cavity, so that the mixer can be heated, the evaporation hydrolysis of urea is promoted, and the crystallization risk is reduced.

The utility model also provides an engine of including above-mentioned close coupling aftertreatment device. The derivation process of the beneficial effect of the engine is substantially similar to the derivation process of the beneficial effect brought by the tightly coupled aftertreatment device, and therefore, the description is omitted here.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic diagram of an internal structure of a tightly coupled post-processing device according to an embodiment of the present invention;

fig. 2 is a schematic view of the working principle of the tightly coupled post-processing device according to an embodiment of the present invention.

The meaning of the individual reference numerals in fig. 1 to 2 is:

1-front cavity, 2-rear cavity, 3-catalyst carrier, 4-mixing tube, 5-mixing tail cavity, 6-mixer, 7-urea nozzle, 8-waste gas inlet, 9-mixing cylinder, 10-HC nozzle, 11-air outlet tube.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1 and fig. 2, fig. 1 is a schematic diagram of an internal structure of a tightly coupled post-processing device according to an embodiment of the present invention; fig. 2 is a schematic view of the working principle of the tightly coupled post-processing device according to an embodiment of the present invention.

The utility model provides a close coupling aftertreatment device, the power distribution box comprises a box body, blender 6, catalyst carrier 3, including the antechamber 1 and the back chamber 2 that communicate each other in the box, the lateral wall of antechamber 1 is equipped with waste gas entry 8 and exhaust outlet, the mixing drum 9 of blender 6 and surrounding blender 6 is arranged to antechamber 1, the one end of mixing drum 9 communicates in waste gas entry 8 and other end intercommunication has

hybrid tube

4, 2 internal parallel arrangement have two at least catalyst carrier 3 in the back chamber, the one end of each catalyst carrier 3 is arranged towards antechamber 1 and is formed mixing tail chamber 5 between the lateral wall of the other end and back chamber 2, hybrid tube 4 extends and end opening in mixing tail chamber 5 along the direction of keeping away from antechamber 1, exhaust outlet is provided with HC nozzle 10. In addition, the mixing drum 9 is preferably also provided with a urea nozzle 7 at the inlet of the mixer 6, of course, the present invention also makes it possible to provide the urea nozzle 7 at the exhaust gas inlet 8 for injecting the urea solution. The mixer 6 is preferably a vortex sheet mixer, although other forms of mixers may be used.

the exhaust gas discharged by the supercharger enters a mixing cylinder 9 of the front cavity 1 through an exhaust gas inlet 8, the urea nozzle 7 sprays urea, the urea is mixed by a mixer 6 and then is guided into a mixing tail cavity 5 through a mixing pipe 4, the exhaust gas enters each catalyst carrier 3 through the mixing tail cavity 5 for catalytic reduction, the reacted exhaust gas is discharged into the front cavity 1 through the front end of the catalyst carrier 3, and finally, when the exhaust gas is discharged through an exhaust gas outlet, the HC nozzle 10 sprays hydrocarbon, so that a solution is provided for the regeneration of the DOC-DPF-SCR assembly at the rear stage.

It should be noted that the catalyst carrier 3 may be designed to have a block structure, a columnar structure, or the like, and preferably, the catalyst carrier 3 of the present embodiment has a columnar structure, and the respective catalyst carriers 3 are arranged in parallel. As shown in fig. 2, the present solution arranges two catalyst carriers 3 arranged in parallel in the rear chamber 2.

It should be noted that the mixing drum 9 is used for guiding the exhaust gas through the mixer 6, and the mixing drum 9 may be arranged in the front chamber 1 in a plurality of directions, preferably, the axial direction of the mixing drum 9 is perpendicular to the axial direction of the catalyst carrier 3, as shown in fig. 2, so that the length of the box body can be shortened to the maximum extent, thereby making it easier to meet the requirement of compact space arrangement.

This scheme has optimized the air current trend of waste gas in the box, and waste gas is behind 6 mixers, and leading-in 5 to the mixed tail chamber along mixing tube 4 has prolonged the mixing distance, can effectively solve two way SCR and mix inhomogeneous problem. Further preferably, the respective catalyst carriers 3 are uniformly distributed on the circumferential outer side of the mixing pipe 4. So set up, waste gas can distribute in the rear end of each catalyst carrier 3 more evenly when entering mixing tail chamber 5 by the export of mixing tube 4, makes gas more evenly pass through every catalyst carrier 3.

Preferably, the side wall of the mixing drum 9 is arranged opposite to the front end of the at least one catalyst carrier 3. With this arrangement, after the exhaust gas returns from the front end of the catalyst carrier 3 to the front chamber 1, the exhaust gas flows through the mixing cylinder 9 and heats the mixer 6, thereby promoting the evaporative hydrolysis of urea and reducing the risk of crystallization.

The utility model discloses the exhaust outlet at the box is integrated simultaneously and is provided with HC nozzle 10, and HC nozzle 10 is the device that is used for spraying hydrocarbon, solves the regenerated problem of particle trap, still is used for improving exhaust temperature. Preferably, an outlet pipe 11 is connected to the outer side of the exhaust gas outlet, a nozzle holder is fixed on the outlet pipe 11, and the HC nozzle 10 is arranged on the nozzle holder. The nozzle holder may be fixed to the outlet pipe 11 by welding or fixing a connector, and the HC nozzle 10 may be fixed to the nozzle holder by a connector such as a bolt. The scheme can also avoid HC poisoning of the SCR catalyst by arranging the HC nozzle 10 at the exhaust gas outlet of the box body.

Preferably, the exhaust gas inlet 8 and the exhaust gas outlet are provided on the same side wall of the front chamber 1. As shown in fig. 1, the exhaust gas inlet 8 and the exhaust gas outlet are both disposed on the side wall of the front cavity 1 far from the rear cavity 2, which can facilitate the arrangement of other components of the engine.

It should be noted that the present invention may determine the size specification of the catalyst carrier 3 according to the specification of the mid-sized platform engine for a specific application, for example, two 5.66 inches catalyst carriers 3 are provided.

The utility model discloses following beneficial effect has:

1) in the scheme, in a compact box body space, an arrangement mode that two or more catalyst carriers 3 are connected in parallel is adopted, so that the back pressure loss is reduced on the premise of reducing the nitrogen oxides of the waste gas, the post-treatment temperature of the front-stage SCR is effectively increased, and the conversion efficiency of the cold-state circulating catalyst is improved;

2) in the scheme, the HC nozzle 10 is integrated at the exhaust gas outlet of the box body, so that the regeneration requirement of a DOC-DPF-SCR assembly at the later stage is met;

3) the exhaust gas flow after passing through the catalyst carrier 3 in the scheme returns to the front cavity 1, the mixer 6 can be heated, the evaporation hydrolysis of urea is promoted, and the crystallization risk is reduced.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A tightly coupled post-treatment device is characterized by comprising a box body, a mixer (6) and catalyst carriers (3), wherein the box body comprises a front cavity (1) and a rear cavity (2) which are communicated with each other, the side wall of the front cavity (1) is provided with an exhaust gas inlet (8) and an exhaust gas outlet, the mixer (6) and a mixing barrel (9) surrounding the mixer (6) are arranged in the front cavity (1), one end of the mixing barrel (9) is communicated with the exhaust gas inlet (8) and the other end is communicated with a mixing pipe (4), at least two catalyst carriers (3) are arranged in the rear cavity (2) in parallel, one end of each catalyst carrier (3) faces the front cavity (1) and the other end of each catalyst carrier (3) and a mixing tail cavity (5) is formed between the side wall of the rear cavity (2), the mixing pipe (4) extends along the direction far away from the front cavity (1) and is opened at the tail end of each catalyst carrier (5), the exhaust gas outlet is provided with an HC nozzle (10).

2. The close-coupled aftertreatment device according to claim 1, wherein the catalyst carriers (3) are of a columnar structure, and the catalyst carriers (3) are arranged in parallel.

3. The close-coupled aftertreatment device according to claim 2, characterized in that the axial direction of the mixing drum (9) is arranged perpendicular to the axial direction of the catalyst support body (3).

4. The close-coupled aftertreatment device according to claim 1, characterized in that the individual catalyst carriers (3) are distributed uniformly over the circumferential outer side of the mixing tube (4).

5. The close-coupled aftertreatment device according to claim 1, characterized in that the side wall of the mixing drum (9) is arranged opposite the front end of at least one of the catalyst carriers (3).

6. The close-coupled aftertreatment device according to claim 1, wherein an outlet pipe (11) is connected to the outer side of the exhaust outlet, a nozzle holder is fixed on the outlet pipe (11), and the HC nozzle (10) is arranged on the nozzle holder.

7. The close-coupled aftertreatment device according to claim 1, characterized in that the exhaust gas inlet (8) and the exhaust gas outlet are provided on the same side wall of the front chamber (1).

8. The close-coupled aftertreatment device according to claim 1, characterized in that the mixing drum (9) is provided with a urea nozzle (7) at the inlet of the mixer (6).

9. The close-coupled aftertreatment device of claim 1, wherein the mixer (6) is a spinning disk mixer.

10. An engine comprising a close-coupled aftertreatment device according to any one of claims 1 to 9.