Exhaust gas aftertreatment package

Abstract

An exhaust gas aftertreatment package includes a first aftertreatment carrier assembly, a second aftertreatment carrier assembly, a first mixing chamber housing, a mixing tube, a second mixing chamber housing, a third aftertreatment carrier assembly, and a fourth aftertreatment carrier assembly. The second mixing chamber housing includes an end plate, a baffle, and a second mixing chamber. The end plate is provided with a first connection port, a second connection port, and a third connection port. The baffle is provided with a first arc surface recessed in a direction away from the first connection port, a second arc surface recessed in a direction away from the second connection port, and a third arc surface protruding in a direction of the third connection port, the third arc surface connecting the first arc surface and the second arc surface. In this way, back pressure is reduced and uniformity of gas flow when entering the third aftertreatment carrier assembly and the fourth aftertreatment carrier assembly is improved.

Description

Technical Field

[0001] The invention relates to an exhaust gas after-treatment package, belonging to the technical field of engine exhaust gas after-treatment. Background Art

[0002] With the continuous upgrading of emission regulations, existing exhaust after-treatment packages generally include a diesel oxidation catalyst, a diesel particulate filter, a selective catalytic reducer, and a mixing tube assembly installed between the diesel particulate filter and the selective catalytic reducer.

[0003] However, how to improve the uniformity of the mixed flow of exhaust gas and urea droplets when passing through the inlet end face of the selective catalytic reduction agent and how to reduce the back pressure are technical problems faced by those skilled in the art. Summary of the Invention

[0004] The object of the present invention is to provide an exhaust gas after-treatment package capable of improving airflow distribution uniformity and reducing back pressure.

[0005] To achieve the above-mentioned object, the present invention adopts the following technical solution: an exhaust gas after-treatment package, which includes a first after-treatment carrier assembly, a second after-treatment carrier assembly connected to the first after-treatment carrier assembly and located downstream of the first after-treatment carrier assembly, a first mixing chamber shell connected to the second after-treatment carrier assembly and located downstream of the second after-treatment carrier assembly, a mixing tube connected to the first mixing chamber shell, a second mixing chamber shell connected to the mixing tube, a third after-treatment carrier assembly connected to the second mixing chamber shell, and a fourth after-treatment carrier assembly connected to the second mixing chamber shell, wherein the first mixing chamber The shell is provided with a first mixing chamber, and the second mixing chamber shell includes an end plate, a guide plate connected to the end plate, and a second mixing chamber located between the end plate and the guide plate. The end plate is provided with a first connecting port connected to the third after-treatment carrier assembly, a second connecting port connected to the fourth after-treatment carrier assembly, and a third connecting port connected to the mixing tube. The guide plate is provided with a first curved surface recessed in a direction away from the first connecting port, a second curved surface recessed in a direction away from the second connecting port, and a third curved surface protruding in the direction of the third connecting port. The third curved surface connects the first curved surface and the second curved surface.

[0006] As a further improved technical solution of the present invention, the first after-treatment carrier assembly includes a diesel oxidation catalyst.

[0007] As a further improved technical solution of the present invention, the exhaust gas after-treatment package further includes an intake cone pipe connected to the diesel oxidation catalyst.

[0008] As a further improved technical solution of the present invention, the second after-treatment carrier assembly includes a diesel particulate filter, and the second after-treatment carrier assembly is detachably connected to the first after-treatment carrier assembly.

[0009] As a further improved technical solution of the present invention, the exhaust gas after-treatment package is provided with a urea nozzle mounting seat, the urea nozzle mounting seat is used to install a urea nozzle, and the urea nozzle is used to spray atomized urea droplets into the mixing tube.

[0010] As a further improved technical solution of the present invention, the third after-treatment carrier assembly and the fourth after-treatment carrier assembly are connected in parallel.

[0011] As a further improved technical solution of the present invention, the first after-treatment carrier assembly extends along a first axial direction, the second after-treatment carrier assembly extends along a second axial direction, the third after-treatment carrier assembly extends along a third axial direction, and the fourth after-treatment carrier assembly extends along a fourth axial direction, wherein the first axial direction and the second axial direction are aligned, and the second axial direction, the third axial direction and the fourth axial direction are parallel to each other.

[0012] As a further improved technical solution of the present invention, the third post-treatment carrier assembly includes a selective catalytic reducing agent.

[0013] As a further improved technical solution of the present invention, the fourth after-treatment carrier assembly includes a selective catalytic reducing agent.

[0014] As a further improved technical solution of the present invention, the exhaust gas after-treatment package includes a urea crushing tube located in the mixing tube, and a tube wall of the urea crushing tube is provided with a plurality of narrow grooves extending along the axial direction of the urea crushing tube.

[0015] Compared with the prior art, the present invention can guide the airflow flowing out of the mixing tube to both sides by providing a third curved surface, thereby reducing the back pressure; in addition, by providing the first curved surface and the second curved surface, the buffering of the airflow can be increased, thereby improving the uniformity of the airflow when entering the third after-treatment carrier assembly and the fourth after-treatment carrier assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional schematic diagram of the exhaust gas after-treatment package of the present invention in one embodiment.

[0017] Figure 2 yes Figure 1 Partial exploded view of the .

[0018] Figure 3 yes Figure 2 Further partially exploded perspective view.

[0019] Figure 4 yes Figure 3 Schematic diagram of the second mixing chamber shell.

[0020] Figure 5 yes Figure 4 Top view of .

[0021] Figure 6 It is along Figure 5 Schematic diagram of the cross section along the BB line. DETAILED DESCRIPTION

[0022] The following will describe in detail the specific embodiments of the present invention in conjunction with the accompanying drawings. If there are several specific embodiments, the features of these embodiments can be combined with each other without conflict. When the description refers to the drawings, unless otherwise specified, the same numbers or symbols in different drawings represent the same or similar elements. The contents described in the following exemplary embodiments do not represent all embodiments of the present invention. On the contrary, they are only examples of products consistent with the present invention as described in the claims of the present invention.

[0023] The terms used in the present invention are for the purpose of describing specific embodiments only and are not intended to limit the scope of protection of the present invention. It should be understood that the terms "first," "second," and similar terms used in the specification and claims of the present invention do not indicate any order, quantity, or importance, but are merely used to distinguish features.

[0024] Please refer to Figures 1 to 6 As shown, the present invention discloses an exhaust after-treatment package 100, which includes a shell 7, a first baffle 21 and a second baffle 22 connected to the shell 7 and arranged at intervals, an intake cone 1 for exhaust gas to enter, a first after-treatment carrier assembly 31 connected to the intake cone 1 and located downstream of the intake cone 1, a second after-treatment carrier assembly 32 connected to the first after-treatment carrier assembly 31 and located downstream of the first after-treatment carrier assembly 31, a first mixing chamber shell 41 connected to the second after-treatment carrier assembly 32 and located downstream of the second after-treatment carrier assembly 32, a mixing tube 5 connected to the first mixing chamber shell 41, a second mixing chamber shell 42 connected to the mixing tube 5, a third after-treatment carrier assembly 33 connected to the second mixing chamber shell 42, and a fourth after-treatment carrier assembly 34 connected to the second mixing chamber shell 42.

[0025] Specifically, in one embodiment of the present invention, the first aftertreatment substrate assembly 31 includes a diesel oxidation catalyst (DOC), the second aftertreatment substrate assembly 32 includes a diesel particulate filter (DPF), the third aftertreatment substrate assembly 33 includes a selective catalytic reducer (SCR), and the fourth aftertreatment substrate assembly 34 also includes a selective catalytic reducer (SCR). The third aftertreatment substrate assembly 33 and the fourth aftertreatment substrate assembly 34 are connected in parallel. The second aftertreatment substrate assembly 32 is detachably connected to the first aftertreatment substrate assembly 31. For example, the second aftertreatment substrate assembly 32 can be detachably connected to the first aftertreatment substrate assembly 31 via a clamp. This arrangement facilitates cleaning and maintenance of the second aftertreatment substrate assembly 32.

[0026] The first mixing chamber housing 41 is provided with a first mixing chamber (not shown), and the exhaust gas after-treatment package 100 is provided with a urea nozzle mounting seat (not shown), which is used to mount a urea nozzle (not shown), and the urea nozzle is used to spray atomized urea droplets into the mixing pipe 5.

[0027] The second mixing chamber housing 42 includes an end plate 421, a guide plate 422 connected to the end plate 421, and a second mixing chamber 420 located between the end plate 421 and the guide plate 422. The end plate 421 is provided with a first connection port 4211 connected to the third after-treatment carrier assembly 33, a second connection port 4212 connected to the fourth after-treatment carrier assembly 34, and a third connection port 4213 connected to the mixing tube 5. The guide plate 422 is provided with a first curved surface 4221 that is recessed away from the first connection port 4211, a second curved surface 4222 that is recessed away from the second connection port 4212, and a third curved surface 4223 that is protruding toward the third connection port 4213. The third curved surface 4223 connects the first curved surface 4221 and the second curved surface 4222.

[0028] The first after-treatment carrier assembly 31 extends along a first axial direction A1, the second after-treatment carrier assembly 32 extends along a second axial direction A2, the third after-treatment carrier assembly 33 extends along a third axial direction A3, and the fourth after-treatment carrier assembly 34 extends along a fourth axial direction A4, wherein the first axial direction A1 and the second axial direction A2 are aligned, and the second axial direction A2, the third axial direction A3 and the fourth axial direction A4 are parallel to each other.

[0029] The mixing pipe 5 is cylindrical. The exhaust gas aftertreatment package 100 further comprises a urea breaking pipe 51 located in the mixing pipe 5, and a plurality of slots 511 extending along the axial direction of the urea breaking pipe 51 are arranged on the wall of the urea breaking pipe 51. By arranging the slots 511, the urea particles are further broken into smaller particles, thereby reducing the risk of urea crystallization and improving the uniformity of ammonia. In addition, when urea droplets form a liquid film in the local part of the slots 511, the liquid film can also move along the extension direction of the slots 511 under the blowing of the gas flow, thereby reducing the risk of urea crystallization due to the long-time stay of the liquid film in a certain local part.

[0030] By arranging the third arc surface 4223, the gas flow flowing out of the mixing pipe 5 can be guided to both sides, thereby reducing the back pressure. In addition, by arranging the first arc surface 4221 and the second arc surface 4222, the buffering of the gas flow can be increased, thereby improving the uniformity of the gas flow when entering the third aftertreatment carrier assembly 33 and the fourth aftertreatment carrier assembly 34.

[0031] The above embodiments are only used to illustrate the technical solutions of the present application and not to limit the present application. The understanding of the present specification should be based on the technical personnel in the art. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical personnel in the art can still modify or equivalently replace the present application, and all technical solutions and improvements which do not deviate from the spirit and scope of the present application should be covered in the scope of the claims of the present application.

Claims

1. An exhaust gas post-processing package, characterized in that: The invention comprises a first after-treatment carrier assembly, a second after-treatment carrier assembly connected to the first after-treatment carrier assembly and located downstream of the first after-treatment carrier assembly, a first mixing chamber shell connected to the second after-treatment carrier assembly and located downstream of the second after-treatment carrier assembly, a mixing tube connected to the first mixing chamber shell, a second mixing chamber shell connected to the mixing tube, a third after-treatment carrier assembly connected to the second mixing chamber shell, and a fourth after-treatment carrier assembly connected to the second mixing chamber shell, wherein the first mixing chamber shell is provided with a first mixing chamber, the second mixing chamber shell comprises an end plate, a guide plate connected to the end plate, and a second mixing chamber located between the end plate and the guide plate, the end plate is provided with a first connecting port connected to the third after-treatment carrier assembly, a second connecting port connected to the fourth after-treatment carrier assembly, and a third connecting port connected to the mixing tube, the guide plate is provided with a first curved surface recessed in a direction away from the first connecting port, a second curved surface recessed in a direction away from the second connecting port, and a third curved surface protruding in a direction of the third connecting port, and the third curved surface connects the first curved surface and the second curved surface.

2. The exhaust gas post-processing package according to claim 1, characterized in that: The first aftertreatment substrate assembly includes a diesel oxidation catalyst.

3. The exhaust gas post-processing package according to claim 2, characterized in that: The exhaust gas after-treatment package further includes an intake cone connected to the diesel oxidation catalyst.

4. The exhaust gas post-processing package according to claim 2, characterized in that: The second aftertreatment substrate assembly includes a diesel particulate filter and is detachably connected to the first aftertreatment substrate assembly.

5. The exhaust gas post-processing package according to claim 1, characterized in that: The exhaust gas after-treatment package is provided with a urea nozzle mounting seat, and the urea nozzle mounting seat is used to install a urea nozzle, and the urea nozzle is used to spray atomized urea droplets into the mixing pipe.

6. The exhaust gas post-processing package according to claim 1, characterized in that: The third aftertreatment substrate assembly is connected in parallel with the fourth aftertreatment substrate assembly.

7. The exhaust gas post-processing package according to claim 6, characterized in that: The first aftertreatment carrier assembly extends along a first axial direction, the second aftertreatment carrier assembly extends along a second axial direction, the third aftertreatment carrier assembly extends along a third axial direction, and the fourth aftertreatment carrier assembly extends along a fourth axial direction, wherein the first axial direction and the second axial direction are aligned, and the second axial direction, the third axial direction, and the fourth axial direction are parallel to each other.

8. The exhaust gas post-processing package according to claim 1, characterized in that: The third aftertreatment substrate assembly includes a selective catalytic reducer.

9. The exhaust gas post-processing package according to claim 1, characterized in that: The fourth aftertreatment substrate assembly includes a selective catalytic reducer.

10. The exhaust gas post-treatment package according to any one of claims 1 to 9, characterized in that: The exhaust gas after-treatment package includes a urea crushing tube located in the mixing tube. A tube wall of the urea crushing tube is provided with a plurality of narrow grooves extending along the axial direction of the urea crushing tube.

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