CN111365105A

CN111365105A - Tail gas aftertreatment encapsulation

Info

Publication number: CN111365105A
Application number: CN202010315418.7A
Authority: CN
Inventors: 李伟
Original assignee: Tenneco Suzhou Emission System Co Ltd
Current assignee: Tenneco Suzhou Emission System Co Ltd
Priority date: 2020-04-21
Filing date: 2020-04-21
Publication date: 2020-07-03
Also published as: WO2021213146A1

Abstract

An exhaust aftertreatment package includes an outer shell, first and second baffles positioned within the outer shell and spaced apart, a third aftertreatment carrier assembly, and a mixing tube assembly. The third aftertreatment carrier assembly includes a third housing and a third catalyst carrier encapsulated within the third housing. The third shell is provided with a plurality of protruding portions fixed with the second baffle and an airflow channel located between every two adjacent protruding portions, and the airflow channel penetrates through the second baffle to be communicated with the third aftertreatment carrier assembly. Compared with the prior art, the third shell is easily fixed on the second baffle plate by arranging the plurality of the convex parts on the third shell; in addition, by designing the airflow channel and enabling the airflow channel to penetrate through the second baffle plate to be communicated with the third aftertreatment carrier assembly, an additional flow guide element is omitted, and the cost of exhaust aftertreatment packaging is reduced.

Description

Tail gas aftertreatment encapsulation

Technical Field

The invention relates to a tail gas aftertreatment package, and belongs to the technical field of engine tail gas aftertreatment.

Background

With the increasing upgrading of emission regulations, existing exhaust aftertreatment packages typically include a diesel oxidation catalyst, a diesel particulate trap, a selective catalytic reductant, and a mixing tube assembly installed between the diesel particulate trap and the selective catalytic reductant. When the gas flows out of the mixing component, a flow guiding structure is usually required to be designed before entering the selective catalytic reducing agent. This design, on the one hand, increases the number of parts and, on the other hand, increases the coaxiality requirements of the selective catalytic reduction assembly when mounted on the baffle, resulting in increased costs.

Disclosure of Invention

The invention aims to provide a tail gas aftertreatment package with low cost.

In order to achieve the purpose, the invention adopts the following technical scheme: an exhaust aftertreatment package comprising an outer shell, first and second baffles positioned within the outer shell and spaced apart, a second aftertreatment carrier assembly positioned within the outer shell, a third aftertreatment carrier assembly positioned downstream of the second aftertreatment carrier assembly, and a mixing tube assembly communicating between the second and third aftertreatment carrier assemblies; the first baffle plate is provided with a first side surface facing the second baffle plate and a second side surface opposite to the first side surface, and the second baffle plate is provided with a third side surface facing the first baffle plate and a fourth side surface opposite to the third side surface; the third aftertreatment carrier component comprises a third shell and a third catalyst carrier encapsulated in the third shell, the tail gas aftertreatment encapsulation comprises a first connecting cavity located on the fourth side face of the second baffle and a second connecting cavity located between the first baffle and the second baffle, the third shell is provided with a plurality of protruding portions for fixing the second baffle and an airflow channel located between every two adjacent protruding portions, the airflow channel penetrates through the second baffle, the first connecting cavity is communicated with the second aftertreatment carrier component, and the second connecting cavity is communicated with the third aftertreatment carrier component through the airflow channel.

As a further improved technical solution of the present invention, the first baffle is provided with a positioning opening for positioning the third shell, the second baffle is provided with an opening, the plurality of protrusions are welded and fixed to the third side surface, and the airflow channel is communicated with the opening.

As a further improved technical solution of the present invention, the first baffle is provided with a second convex hull which is formed by stamping and protrudes from the fourth side surface, the second convex hull forms the opening portion, and the second convex hull is provided with a third connection cavity communicated with an inlet of the third aftertreatment carrier assembly.

As a further improved technical solution of the present invention, the mixing tube assembly includes a terminal extending into the second connecting cavity, wherein the mixing tube assembly is fixed to the second baffle, and a gap is provided between the terminal and the first baffle.

As a further improved technical scheme of the invention, the mixing tube assembly comprises a mixing tube and an extension tube sleeved on the mixing tube, the mixing tube is provided with a plurality of spinning disks communicated with the first connecting cavity, the second baffle is provided with an opening, the spinning disks are arranged in the opening in a suspended manner, and the mixing tube penetrates through the opening; the spinning disk protrudes out of the fourth side face of the second baffle to extend into the first connecting cavity, and the spinning disk protrudes out of the third side face of the second baffle to extend into the extension cylinder; the expansion cylinder is fixed on the third side surface of the second baffle plate and sealed at the periphery of the opening.

As a further improved technical scheme of the invention, the expansion cylinder is provided with an expansion cavity and an end wall, and the expansion cavity is communicated with the opening; the end wall is provided with a through hole for the mixing pipe to pass through, the mixing pipe is fixed on the end wall, and the tail end is positioned on the mixing pipe.

As a further improved technical solution of the present invention, the first baffle is provided with an arc-shaped recess corresponding to the end, and the arc-shaped recess is recessed from the first side surface to the second side surface.

As a further improved technical solution of the present invention, the exhaust gas aftertreatment package comprises a mounting cover mounted on the mixing tube and a urea nozzle mounting seat fixed on the mounting cover, wherein the mounting cover and the tail end are respectively located at two ends of the mixing tube; the mounting cover is provided with a first raised part and a plurality of positioning grooves positioned on the periphery of the first raised part, and the first raised part is provided with a mounting hole; the urea nozzle mount pad is equipped with the card and holds a plurality of location feet in a plurality of constant head tanks and to the convex second uplift portion of first uplift portion, the second uplift portion insert in the mounting hole and with the installation lid welded fastening, the second uplift portion is equipped with the nozzle bore that is used for installing the urea nozzle.

As a further improved technical solution of the present invention, the exhaust gas aftertreatment package includes a first convex hull fixed to the fourth side of the second baffle plate, and the first connection cavity is formed in the first convex hull.

As a further improved technical scheme of the invention, the second aftertreatment carrier assembly comprises a second shell and a diesel particulate trap packaged in the second shell; the tail gas aftertreatment package comprises a barrel body part sleeved on the periphery of the second shell, and the second aftertreatment carrier component is detachably mounted in the barrel body part.

Compared with the prior art, the third shell is easily fixed on the second baffle plate by arranging the plurality of the protruding parts for fixing the third shell with the second baffle plate on the third shell; in addition, the airflow channel is arranged between the two adjacent protruding parts and penetrates through the second baffle plate to be communicated with the third aftertreatment carrier assembly, so that an additional flow guide element is omitted, and the cost of exhaust aftertreatment packaging is reduced.

Drawings

Fig. 1 is a schematic perspective view of an exhaust aftertreatment package according to the invention in a first embodiment.

Fig. 2 is a front view of fig. 1.

Fig. 3 is a partially exploded perspective view of fig. 1.

Fig. 4 is a further exploded perspective view of fig. 3.

Fig. 5 is a perspective view of the outer case of fig. 1 removed.

Fig. 6 is a perspective view of fig. 5 from another angle.

Fig. 7 is a top view of fig. 6.

Fig. 8 is a partially exploded perspective view of fig. 5.

Fig. 9 is a partially exploded perspective view of fig. 6.

Fig. 10 is a further exploded perspective view of fig. 9.

FIG. 11 is a perspective view of the end cap assembly.

Fig. 12 is a perspective view of fig. 11 from another angle.

Fig. 13 is an exploded perspective view of fig. 11.

Fig. 14 is a schematic sectional view taken along line D-D in fig. 2.

Fig. 15 is a partially enlarged view of circled portion E in fig. 14.

Fig. 16 is a schematic sectional view taken along line F-F in fig. 2.

Fig. 17 is a schematic sectional view taken along line G-G in fig. 2.

Fig. 18 is a schematic sectional view taken along line H-H in fig. 2.

Detailed Description

The following detailed description of the embodiments of the invention will be described in conjunction with the accompanying drawings, in which, if there are several embodiments, the features of these embodiments can be combined with each other without conflict. When the description refers to the accompanying drawings, like numbers or symbols in different drawings represent the same or similar elements unless otherwise specified. The statements made in the following exemplary embodiments do not represent all embodiments of the present invention, but rather they are merely examples of products consistent with the present invention as recited in the claims of the present invention.

The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention. It should be understood that the use of terms such as "first," "second," and the like, in the description and in the claims of the present invention do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another.

Referring to fig. 1 to 18, the present invention discloses an exhaust gas aftertreatment package 100, which includes an outer casing 1, a first baffle 21 and a second baffle 22 disposed in the outer casing 1 at an interval, an inlet pipe 31 for the exhaust gas to enter, an outlet pipe 32 for the exhaust gas to flow out, a first aftertreatment carrier assembly 51, a second aftertreatment carrier assembly 52, a third aftertreatment carrier assembly 53, a mixing pipe assembly 6, and a bracket assembly 7 mounted on the outer casing 1.

In one embodiment of the present invention, the first aftertreatment support assembly 51 includes a first housing 511 and a Diesel Oxidation Catalyst (DOC)512 enclosed within the first housing 511; the second aftertreatment carrier assembly 52 includes a second housing 521 and a diesel particulate trap (DPF)522 enclosed within the second housing 521; the third aftertreatment support assembly 53 includes a third housing 531 and a third catalyst support 532 enclosed within the third housing 531, the third catalyst support 532 may be a Selective Catalytic Reduction (SCR). In the illustrated embodiment of the invention, the third aftertreatment carrier assemblies 53 are two sets arranged side-by-side. In the illustrated embodiment of the invention, the second aftertreatment carrier assembly 52 is located downstream of the first aftertreatment carrier assembly 51, and the third aftertreatment carrier assembly 53 is located downstream of the second aftertreatment carrier assembly 52. The mixing tube assembly 6 communicates between the second aftertreatment carrier assembly 52 and the third aftertreatment carrier assembly 53.

Referring to fig. 5 and 6, the first baffle 21 has a first side surface 211 facing the second baffle 22 and a second side surface 212 opposite to the first side surface 211. The second shutter 22 is provided with a third side 221 facing the first shutter 21 and a fourth side 222 opposite to the third side 221.

In the illustrated embodiment of the present invention, the exhaust aftertreatment package 100 includes an inlet dome 43 welded to the second side 212 of the first panel 21, an outlet dome 44 welded to the second side 212 of the first panel 21, and a first dome 41 welded to the fourth side 222 of the second panel 22. The intake convex hull 43 is provided with an intake cavity 431, wherein one end (e.g., the upper end in fig. 8) of the intake cavity 431 is communicated with the intake pipe 31, and the other end (e.g., the lower end in fig. 8) of the intake cavity 431 is communicated with the inlet of the first aftertreatment carrier assembly 51. The air outlet convex hull 44 is provided with an air outlet cavity 441 communicated with the outlet of the third aftertreatment carrier assembly 53, and the air outlet pipe 32 is communicated with the air outlet cavity 441.

The first convex hull 41 is provided with a first connection cavity 411. The exhaust aftertreatment package 100 includes a second connecting cavity 412 between the first baffle 21 and the second baffle 22. The first connecting chamber 411 is in communication with the second aftertreatment carrier assembly 52, and the second connecting chamber 412 is in communication with the third aftertreatment carrier assembly 53.

In the illustrated embodiment of the present invention, the air inlet pipe 31 is substantially located in the second connecting cavity 412 and penetrates the first baffle 21. The first baffle 21 further includes a positioning hole 213 for positioning the third housing 531. In addition, referring to fig. 8 and 16, the first baffle 21 is further provided with an arc-shaped recess 214 corresponding to the mixing tube assembly 6, and the arc-shaped recess 214 is recessed from the first side surface 211 to the second side surface 212. The arc-shaped recess 214 is used for reversing the airflow to improve the uniformity of the airflow.

The second baffle 22 is provided with an opening 223 matched with the mixing pipe assembly 6 and a second convex hull 42 which is formed by punching and protrudes out of the fourth side surface 222. In the process of forming the second convex hull 42, an opening 224 is also formed in the second shutter 22. The second convex hull 42 is provided with a third connecting cavity 421 communicating with the inlet of the third aftertreatment carrier assembly 53.

The mixing tube assembly 6 comprises a mixing tube 61 and an expansion cylinder 62 sleeved on the mixing tube 61. The mixing pipe 61 is provided with a plurality of spinning disks 611 communicated with the first connection chamber 411. Referring to fig. 9 and 17, the spinning disk 611 is suspended in the opening 223. The mixing tube 61 passes through the opening 223. Specifically, the spinning disk 611 protrudes from the fourth side 222 of the second baffle 22 to extend into the first connecting cavity 411, and the spinning disk 611 protrudes from the third side 221 of the second baffle 22 to extend into the extension cylinder 62. The expansion cylinder 62 is fixed to the third side 221 of the second baffle 22 and sealed around the opening 223. The expansion cylinder 62 is provided with an expansion cavity 621 and an end wall 622, and the expansion cavity 621 is communicated with the opening 223; the end wall 622 is provided with perforations 6221 through which the mixing tube 61 passes, and the mixing tube 61 is fixed to the end wall 622. The mixing tube 61 comprises an end 612 extending into the second connecting chamber 412, wherein a gap 613 is provided between the end 612 and the first baffle 21. So set up, mix tubular component 6 only need one end welding can, to the too high requirement of axiality when having avoided both ends welding, improved the convenience of equipment, the cost is reduced. In other words, when the mixing tube assembly 6 is fixedly welded to the second baffle 22, even if the mixing tube 61 is inclined in the second coupling cavity 412, it does not have a serious influence.

Referring to fig. 11 to 13, the exhaust gas aftertreatment package 100 further includes a mounting cover 63 mounted on the mixing tube 61, and a urea nozzle mounting seat 64 fixed on the mounting cover 63, wherein the mounting cover 63 and the end 612 are respectively located at two ends of the mixing tube 61. The mounting cover 63 is provided with a first rising part 631 at the center and a plurality of positioning grooves 632 at the periphery of the first rising part 631, and the first rising part 631 is provided with a mounting hole 6311. The urea nozzle mount 64 is provided with a plurality of positioning legs 642 retained in the plurality of positioning grooves 632 and a second bump 641 protruding toward the first bump 631. When assembled, the second bump 641 is inserted into the mounting hole 6311 and is welded to the mounting cover 63. The second bump 641 is provided with a nozzle hole 6411 to mount a urea nozzle. Further, in the illustrated embodiment of the present invention, the outer periphery of the urea nozzle mount 64 is optimally designed to have a weld relief 643 to facilitate insertion of a welding gun to weld and fix the mount cap 63 to the mixing tube 61.

Referring to fig. 14 and 15, the exhaust gas aftertreatment package 100 includes a barrel portion 23 penetrating through the first baffle 21 and the second baffle 22. The cylindrical portion 23 is welded and fixed to the first baffle 21 and the second baffle 22. The first case 511 and the second case 521 are both housed in the barrel portion 23. The barrel portion 23 is provided with a first projection 231 (e.g., flare or flange) projecting radially outwardly. The second housing 521 is provided with a second projection 520 projecting radially outward. The exhaust aftertreatment package 100 further includes a seal 523 sandwiched between the first boss 231 and the second boss 520. In an embodiment of the present invention, the sealing member 523 is a sealing gasket sleeved on the second housing 521.

The exhaust aftertreatment package 100 further includes a connector 524 fixed to the second housing 521. Referring to fig. 4, in an embodiment of the invention, the connecting element 524 is an end plate 525 located at an end surface of the second housing 521, and the end plate 525 is provided with a plurality of pressing surfaces 5251. In the illustrated embodiment of the present invention, the number of the pressing surfaces 5251 is three and is evenly distributed along the circumferential direction.

The outer housing 1 is provided with an opening 111 for removal of the second aftertreatment carrier assembly 52. The exhaust aftertreatment package 100 includes an end cap assembly 112 configured to mate with the opening 111 and a clip 115 configured to remove the end cap assembly 112. In particular, the outer housing 1 is provided with a first flange 1111 at the opening 111. The end cap assembly 112 includes an end cap 1121, a second flange 1122 formed on the end cap 1121, and a force application member mounted on the end cap 1121. The exhaust aftertreatment package 100 further includes a first sealing gasket 114 sandwiched between the first flange 1111 and the second flange 1122 to achieve a better seal. The force application part penetrates through the end cover 1121, and can push the connecting piece 524 so as to enable the second shell 521 to tightly abut against the sealing element 523, so that better sealing is achieved.

The force applying member is a bolt assembly 113. Referring to fig. 3, in one embodiment of the present invention, the bolt assembly 113 has three sets, each set includes a bolt 1131 and an internal thread matching with the bolt 1131. When the bolts 1131 are rotated, the length of the bolts 1131 protruding out of the end cover 1121 can be adjusted; as the length of the bolts 1131 protruding through the end cap 1121 increases, the bolts 1131 can push the second housing 521 of the second aftertreatment carrier assembly 52 to move for a better seal. In the illustrated embodiment of the present invention, each set of bolt assemblies 113 includes two nuts, and the internal threads are formed on the inner surfaces of the two nuts. One of the nuts is welded and fixed to the end cap 1121, and the other nut is close to the nut. The bolt 1131 passes through the two nuts. By providing two nuts, the bolt 1131 can be prevented from loosening, thereby improving the reliability when it abuts against the second housing 521.

Referring to fig. 5, 8 and 10, the third housing 531 is provided with a plurality of protrusions 5311 fixed to the second baffle 22 and an air flow channel 5312 located between two adjacent protrusions 5311. The air flow passage 5312 penetrates the second baffle 22. Specifically, the second connecting cavity 412 is communicated with the gas flow channel 5312, the gas flow channel 5312 is communicated with the opening portion 224, the opening portion 224 is communicated with the third connecting cavity 421, and the third connecting cavity 421 is communicated with the inlet of the third aftertreatment carrier assembly 53. In the illustrated embodiment of the present invention, the plurality of protrusions 5311 are welded and fixed to the third side 221. With the arrangement, the coaxiality requirement required by the fact that the third shell 531 penetrates through the two baffles is avoided, the boss 5311 and the second baffle 22 are welded, the welding requirement is reduced, and assembly is facilitated. In addition, by skillfully designing the air flow channel 5312, the number of parts is prevented from being increased, and the cost is saved.

The bracket assembly 7 includes a first bracket 71 and a second bracket 72 arranged in parallel, a first connecting portion 73 and a second connecting portion 74 connecting the first bracket 71 and the second bracket 72, and two sets of rope assemblies 75 connected to the first bracket 71 and the second bracket 72. The rope assembly 75 is strapped to the outer case 1.

When in use, firstly, the exhaust gas of the engine flows into the exhaust gas aftertreatment package 100 from the air inlet pipe 31; the tail gas then enters the plenum 431 and flows to the inlet of the first aftertreatment carrier assembly 51; then, the exhaust gas passes through the first post-treatment carrier assembly 51 and the second post-treatment carrier assembly 52, and enters the first connection cavity 411; then, the tail gas enters the mixing pipe 61 from the rotation of the rotation plate 611; when the spraying condition is met, the urea nozzle sprays atomized urea liquid drops into the mixing pipe 61, the urea liquid drops are pyrolyzed and hydrolyzed under the action of the heat of the tail gas to generate ammonia gas, and the ammonia gas and the tail gas are subjected to chemical reaction to reduce the concentration of harmful substances; the gas flow enters the second connecting chamber 412 from the end 612 of the mixing tube 61; then, the air flows through the air flow passages 5312 into the third connecting cavities 421 and through the two sets of third aftertreatment carrier assemblies 53; the gas flow then enters outlet chamber 441 and finally exits outlet tube 32.

The above embodiments are only for illustrating the invention and not for limiting the technical solutions described in the invention, and the understanding of the present specification should be based on the technical personnel in the field, and although the present specification has described the invention in detail with reference to the above embodiments, the technical personnel in the field should understand that the technical personnel in the field can still make modifications or equivalent substitutions to the present invention, and all the technical solutions and modifications thereof without departing from the spirit and scope of the present invention should be covered in the claims of the present invention.

Claims

1. An exhaust aftertreatment package comprising an outer shell, first and second baffles positioned within the outer shell and spaced apart, a second aftertreatment carrier assembly positioned within the outer shell, a third aftertreatment carrier assembly positioned downstream of the second aftertreatment carrier assembly, and a mixing tube assembly communicating between the second and third aftertreatment carrier assemblies; the first baffle plate is provided with a first side surface facing the second baffle plate and a second side surface opposite to the first side surface, and the second baffle plate is provided with a third side surface facing the first baffle plate and a fourth side surface opposite to the third side surface; the third aftertreatment carrier assembly includes a third housing and a third catalyst carrier encapsulated within the third housing, characterized in that: the tail gas aftertreatment package comprises a first connecting cavity located on the fourth side face of the second baffle and a second connecting cavity located between the first baffle and the second baffle, the third shell is provided with a plurality of protruding portions for fixing the second baffle and an airflow channel located between every two adjacent protruding portions, the airflow channel penetrates through the second baffle, the first connecting cavity is communicated with the second aftertreatment carrier assembly, and the second connecting cavity is communicated with the third aftertreatment carrier assembly through the airflow channel.

2. The exhaust aftertreatment package of claim 1, wherein: the first baffle is provided with a positioning hole for positioning the third shell, the second baffle is provided with an opening, the plurality of protrusions are welded and fixed to the third side face, and the airflow channel is communicated with the opening.

3. The exhaust aftertreatment package of claim 2, wherein: the first baffle is provided with a punch forming and protruding second convex hull on the fourth side surface, the second convex hull forms the opening part, and the second convex hull is provided with a third connecting cavity communicated with an inlet of the third post-processing carrier assembly.

4. The exhaust aftertreatment package of claim 1, wherein: the mixing tube assembly includes a tip that extends into the second connecting cavity, wherein the mixing tube assembly is fixed to the second baffle, a gap being provided between the tip and the first baffle.

5. The exhaust aftertreatment package of claim 4, wherein: the mixing pipe assembly comprises a mixing pipe and an extension barrel sleeved on the mixing pipe, the mixing pipe is provided with a plurality of spinning disks communicated with the first connecting cavity, the second baffle is provided with an opening, the spinning disks are arranged in the opening in a suspended mode, and the mixing pipe penetrates through the opening; the spinning disk protrudes out of the fourth side face of the second baffle to extend into the first connecting cavity, and the spinning disk protrudes out of the third side face of the second baffle to extend into the extension cylinder; the expansion cylinder is fixed on the third side surface of the second baffle plate and sealed at the periphery of the opening.

6. The exhaust aftertreatment package of claim 5, wherein: the expansion cylinder is provided with an expansion cavity and an end wall, and the expansion cavity is communicated with the opening; the end wall is provided with a through hole for the mixing pipe to pass through, the mixing pipe is fixed on the end wall, and the tail end is positioned on the mixing pipe.

7. The exhaust aftertreatment package of claim 4, wherein: the first baffle is provided with an arc-shaped concave part corresponding to the tail end, and the arc-shaped concave part is concave from the first side surface to the second side surface.

8. The exhaust aftertreatment package of claim 5, wherein: the tail gas aftertreatment package comprises an installation cover installed on the mixing pipe and a urea nozzle installation seat fixed on the installation cover, wherein the installation cover and the tail end are respectively positioned at two ends of the mixing pipe; the mounting cover is provided with a first raised part and a plurality of positioning grooves positioned on the periphery of the first raised part, and the first raised part is provided with a mounting hole; the urea nozzle mount pad is equipped with the card and holds a plurality of location feet in a plurality of constant head tanks and to the convex second uplift portion of first uplift portion, the second uplift portion insert in the mounting hole and with the installation lid welded fastening, the second uplift portion is equipped with the nozzle bore that is used for installing the urea nozzle.

9. The exhaust aftertreatment package of claim 1, wherein: the exhaust gas aftertreatment package comprises a first convex hull fixed to a fourth side of the second baffle plate, and the first connection cavity is formed in the first convex hull.

10. The exhaust aftertreatment package of claim 1, wherein: the second aftertreatment carrier assembly comprises a second housing and a diesel particulate trap enclosed within the second housing; the tail gas aftertreatment package comprises a barrel body part sleeved on the periphery of the second shell, and the second aftertreatment carrier component is detachably mounted in the barrel body part.