CN108019258B

CN108019258B - Box formula tail gas aftertreatment device

Info

Publication number: CN108019258B
Application number: CN201610960776.7A
Authority: CN
Inventors: 不公告发明人
Original assignee: Tenneco Suzhou Emission System Co Ltd
Current assignee: Tenneco Suzhou Emission System Co Ltd
Priority date: 2016-11-04
Filing date: 2016-11-04
Publication date: 2020-11-24
Anticipated expiration: 2036-11-04
Also published as: CN108019258A; WO2018082381A1

Abstract

The utility model provides a box formula tail gas aftertreatment device, its includes the casing, is located mixing assembly in the casing and install in the casing and be cylindric catalyst carrier subassembly, the casing is equipped with first baffle and second baffle that can share, catalyst carrier subassembly bears first baffle with between the second baffle, wherein first baffle with the second baffle all is the square, first baffle is equipped with first diagonal and second diagonal, first baffle is followed 180 degrees backs in first diagonal upset with the second baffle is the same. So set up, can realize the baffle sharing in order to save the cost.

Description

Box formula tail gas aftertreatment device

Technical Field

The invention relates to an engine tail gas aftertreatment device, in particular to a box type tail gas aftertreatment device.

Background

An engine exhaust gas after-treatment device (e.g., a diesel exhaust gas after-treatment device) is mainly a device for treating or purifying toxic and harmful substances in exhaust gas. The toxic substances in the exhaust gas mainly comprise hydrocarbons, carbon monoxide, nitrogen oxides, particulate matters and the like.

The art has developed solutions that combine oxidation-type catalytic converters (DOCs), particulate traps (DPFs), and Selective Catalytic Reduction (SCR) systems to improve the effectiveness of exhaust treatment. In one arrangement, the oxidation catalyst and the particulate trap are disposed in series within a first housing; the selective catalytic reduction agent is disposed within the second housing; the first and second housings are then connected in series by means of a connecting conduit.

In order to enable the exhaust gas to be uniformly mixed with the atomized urea solution in the connecting duct, technical solutions using a mixing tube or a static mixer have been provided in the prior art. Among them, the mixing pipe is generally used under the condition that the engine exhaust gas after-treatment device can provide a sufficient installation space. When the installation space is not enough, the technical scheme of the static mixer is generally adopted.

However, with the requirement of customers for the diversity of installation conditions, how to design a box type exhaust gas after-treatment device which can share parts to save cost is a technical problem to be solved in the field.

Disclosure of Invention

The invention aims to provide a box type exhaust aftertreatment device with a common baffle.

In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a box formula tail gas aftertreatment device, its includes the casing, is located mixing assembly in the casing and install in the casing and be cylindric catalyst carrier subassembly, the casing is equipped with first baffle and second baffle that can share, catalyst carrier subassembly bears first baffle with between the second baffle, wherein first baffle with the second baffle all is the square, first baffle is equipped with first diagonal and second diagonal, first baffle is followed 180 degrees backs in first diagonal upset with the second baffle is the same.

As a further improved technical solution of the present invention, the catalyst carrier assembly includes a first catalyst carrier assembly, a second catalyst carrier assembly located downstream of the first catalyst carrier assembly and aligned in line with the first catalyst carrier assembly, and a third catalyst carrier assembly parallel to the first and second catalyst carrier assemblies; the first baffle is provided with a first round hole for supporting the first catalyst carrier assembly, a second round hole for supporting the third catalyst carrier assembly and a third round hole for supporting the mixing assembly, wherein the center of the third round hole is located on the first diagonal line, and the centers of the first round hole and the second round hole are located on the second diagonal line.

As a further improved technical solution of the present invention, the second baffle plate is provided with a fourth circular hole supporting the second catalyst carrier assembly, a fifth circular hole supporting the third catalyst carrier assembly, and a sixth circular hole supporting the mixing assembly, and the second baffle plate is provided with a third diagonal line and a fourth diagonal line, wherein a center of the sixth circular hole falls on the third diagonal line, and a center of the fourth circular hole and a center of the fifth circular hole both fall on the fourth diagonal line.

As a further improved technical scheme of the invention, the shell is provided with an exhaust inlet, an inlet cavity communicated with the exhaust inlet, a first connecting cavity, a second connecting cavity, an outlet cavity and an exhaust outlet communicated with the outlet cavity; the first catalyst carrier assembly is communicated with the inlet cavity, the first connecting cavity is communicated with the second catalyst carrier assembly and one end of the mixing assembly, the second connecting cavity is communicated with the other end of the mixing assembly and is further communicated with one end of the third catalyst carrier assembly, and the other end of the third catalyst carrier assembly is communicated with the outlet cavity.

As a further improved technical solution of the present invention, the housing is provided with a first convex hull welded on the second baffle, and the first connection cavity is formed between the first convex hull and the second baffle.

As a further improved technical solution of the present invention, the housing is provided with a second convex hull welded to the first baffle plate, and the second connection cavity is formed between the second convex hull and the first baffle plate.

As a further improved technical solution of the present invention, the mixing assembly includes a sleeve portion welded to an outer periphery of the sixth circular hole, the sleeve portion being formed with an expansion chamber communicating with the first connection chamber; the mixing assembly further includes a mixing tube extending through the sleeve portion and provided with a swirl plate at least partially disposed in the expansion chamber.

As a further improved aspect of the present invention, the mixing unit includes a tapered pipe welded to the periphery of the third circular hole, a small diameter of the tapered pipe is welded to the mixing pipe, and a large diameter of the tapered pipe is the same as a diameter of the sleeve portion.

As a further improvement of the invention, the first catalyst carrier component comprises an oxidation-type catalytic converter, the second catalyst carrier component comprises a particulate trap and the third catalyst carrier component comprises a selective catalytic reduction agent.

Compared with the prior art, the invention has the advantage that the first baffle and the second baffle are shared, so that the cost is reduced.

Drawings

FIG. 1 is a schematic perspective view of an engine exhaust aftertreatment device of the present invention.

Fig. 2 is a perspective view of fig. 1 from another angle.

Fig. 3 is a partial exploded perspective view of fig. 1 with the first end cap separated from the second end cap.

Fig. 4 is a front view of fig. 3 with the first and second end caps removed.

Fig. 5 is a further exploded perspective view of fig. 4, with the second convex hull separated.

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

Fig. 7 is a front view of fig. 5 with the second convex hull removed.

Fig. 8 is a further exploded perspective view of fig. 7 with the first baffle separated.

Fig. 9 is a rear view of the first baffle of fig. 8.

Fig. 10 is a front view of the first baffle of fig. 8.

Fig. 11 is a further exploded perspective view of fig. 8 with the cone and mixing tube separated.

Fig. 12 is a partial exploded perspective view of fig. 2 with the third end cap separated from the fourth end cap.

Fig. 13 is a further exploded perspective view of the third and fourth end caps of fig. 12, with the first convex hull separated.

Fig. 14 is an exploded perspective view of fig. 13 from another angle.

Fig. 15 is a front view of fig. 13 with the first convex hull removed.

Fig. 16 is a front view of the second baffle of fig. 13.

Fig. 17 is a further exploded perspective view of fig. 13 with the first convex hull removed.

Fig. 18 is a major side view of fig. 2.

Fig. 19 is a sectional view taken along line a-a in fig. 18.

Fig. 20 is a sectional view taken along line B-B in fig. 19.

Detailed Description

Referring to fig. 1 to 20, the present invention discloses a box-type exhaust gas aftertreatment device 100, which includes a housing 1, a mixing component 2 located in the housing 1, and a catalyst carrier component 3 installed in the housing 1. The catalyst carrier module 3 includes a first cylindrical catalyst carrier module 31, a second cylindrical catalyst carrier module 32, and a third cylindrical catalyst carrier module 33. In the illustrated embodiment of the invention, the second catalyst support assembly 32 is located downstream of the first catalyst support assembly 31 and in line with the first catalyst support assembly 31, and the third catalyst support assembly 33 is parallel to the first and second

catalyst support assemblies

31, 32. The first catalyst carrier component 31 comprises an oxidation-type catalytic converter (DOC), the second catalyst carrier component 32 comprises a particulate trap (DPF), and the third catalyst carrier component 33(SCR) comprises a selective catalytic reduction agent (SCR). The function of the catalyst support member described above is well known to those skilled in the art and will not be described in detail herein.

Referring to fig. 3 and 12, the housing 1 is respectively provided with a first end cap 11 and a second end cap 12, and a third end cap 13 and a fourth end cap 14 at two ends thereof, wherein the first end cap 11 and the second end cap 12 form a double-layer end cap, and an exhaust inlet 111 is connected thereto; the third and

fourth end caps

13 and 14 constitute a double-layered end cap, and an exhaust outlet 131 is connected thereto. In addition, the housing 1 is provided with an inlet chamber 112 communicating with the exhaust inlet 111 and an outlet chamber 132 communicating with the exhaust outlet 131.

Referring to fig. 5 to 16, the housing 1 is provided with a first baffle 15 and a second baffle 16, a first convex hull 17 welded on the second baffle 16, and a second convex hull 18 welded on the first baffle 15, which can be shared by parts. In the illustrated embodiment of the present invention, the first baffle 15 and the second baffle 16 are both square and have the same structure. Of course, "square" herein should be understood to include the case of a chamfer.

Referring to fig. 5 to 12, the first baffle 15 has a first diagonal 156 and a second diagonal 157. The first baffle 15 further comprises a first circular hole 151 supporting the first catalyst carrier assembly 31, a second circular hole 152 supporting the third catalyst carrier assembly 32, and a third circular hole 153 supporting the mixing assembly 2, wherein a center 1531 of the third circular hole 153 falls on the first diagonal 156, and a center 1511 of the first circular hole 151 and a center 1521 of the second circular hole 152 both fall on the second diagonal 157. The first circular hole 151 and the second circular hole 152 are symmetrically arranged along the first diagonal 156.

Referring to fig. 16, the second baffle 16 has a third diagonal 166 and a fourth diagonal 167. The second baffle 16 further includes a fourth circular hole 161 supporting the second catalyst carrier assembly 32, a fifth circular hole 162 supporting the third catalyst carrier assembly 33, and a sixth circular hole 163 supporting the mixing assembly 2, wherein a center 1631 of the sixth circular hole 163 falls on the third diagonal 166, and a center 1611 of the fourth circular hole 161 and a center 1621 of the fifth circular hole 162 both fall on the fourth diagonal 167. The fourth circular hole 161 and the fifth circular hole 162 are symmetrically arranged along the third diagonal line 166. With this arrangement, the first baffle 15 and the second baffle 16 can share the same part number to save cost. Referring to fig. 9 and 16, the first baffle 15 can be used as the second baffle 16 by rotating 180 degrees along the first diagonal 156.

Referring to fig. 14 and 20, a first connection cavity 171 is formed between the first convex hull 17 and the second baffle 16, and the first connection cavity 171 connects the fourth circular hole 161 and the sixth circular hole 163.

Referring to fig. 3 to 5, a second connection cavity 181 is formed between the second convex hull 18 and the first baffle 15, and the second connection cavity 181 connects the third circular hole 153 and the second circular hole 152.

The exhaust communication path of the present invention is as follows: the first catalyst carrier assembly 31 is in communication with the inlet chamber 112, the first connecting chamber 171 is in communication with the second catalyst carrier assembly 32 and one end of the mixing assembly 2 (the end near the urea nozzle), the second connecting chamber 181 is in communication with the other end of the mixing assembly 2 (the end far from the urea nozzle) and is further in communication with one end of the third catalyst carrier assembly 33, and the other end of the third catalyst carrier assembly 33 is in communication with the outlet chamber 132.

Referring to fig. 11 to 20, the mixing assembly 2 includes a sleeve portion 21 welded to the periphery of the sixth circular hole 163, a mixing pipe 22 penetrating through the sleeve portion 21, and a conical pipe 23 welded to the periphery of the third circular hole 153. The shroud portion 21 is formed with an expansion chamber 211 communicating with the first connection chamber 171, and the mixing tube 22 is provided with a swirl plate 221 at least partially located in the expansion chamber 211. The swirl plates 221 are arranged at an angle so that the exhaust gas can form a good vortex in the mixing pipe 22 to improve the mixing uniformity of urea and exhaust gas. The small diameter 231 of the conical pipe 23 is welded to the mixing pipe 22, and the large diameter 232 of the conical pipe 23 is the same as the diameter of the sleeve portion 21.

In use, exhaust gas from the engine enters first from the exhaust inlet 111 and then enters the inlet chamber 112; the exhaust gas then passes through the first catalyst carrier assembly 31 and the second catalyst carrier assembly 32 into the first connection chamber 171; under the action of the exhaust pressure, the exhaust enters the mixing pipe 22 under the guidance of the swirl plate 221; when the injection condition is reached, a urea nozzle (not shown) injects the atomized urea solution into the mixing pipe 22; after mixing with the urea droplets and the exhaust gas, the urea droplets and the exhaust gas reach the second connection cavity 181 along the taper pipe 23, wherein the taper pipe 23 can play a role in reducing back pressure; the gas flow then passes through the third catalyst support assembly 33 into the outlet cavity 132 and finally out the exhaust outlet 131.

Compared with the prior art, the invention has the advantage that the cost is reduced by sharing the first baffle 15 and the second baffle 16.

In addition, the above embodiments are only used 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 by referring to the above embodiments, the ordinary skilled in the art 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. The utility model provides a box formula tail gas aftertreatment device, its includes the casing, is located mixing assembly in the casing and install in the casing and be cylindric catalyst carrier subassembly, its characterized in that: the shell is provided with a first baffle plate and a second baffle plate which can be shared, the catalyst carrier assembly is carried between the first baffle plate and the second baffle plate, the first baffle plate and the second baffle plate are both square, the first baffle plate is provided with a first diagonal line and a second diagonal line, the first baffle plate is the same as the second baffle plate after being overturned for 180 degrees along the first diagonal line, and the catalyst carrier assembly comprises a first catalyst carrier assembly, a second catalyst carrier assembly which is positioned at the downstream of the first catalyst carrier assembly and is aligned with the first catalyst carrier assembly in a straight line, and a third catalyst carrier assembly which is parallel to the first catalyst carrier assembly and the second catalyst carrier assembly; the first baffle is provided with a first round hole for supporting the first catalyst carrier assembly, a second round hole for supporting the third catalyst carrier assembly and a third round hole for supporting the mixing assembly, wherein the center of the third round hole is located on the first diagonal line, the center of the first round hole and the center of the second round hole are located on the second diagonal line, and the first round hole and the second round hole are symmetrically arranged along the first diagonal line.

2. A box-type exhaust gas aftertreatment device according to claim 1, wherein: the second baffle is equipped with the support the fourth round hole of second catalyst carrier subassembly, supports the fifth round hole of third catalyst carrier subassembly and supports the sixth round hole of hybrid module, the second baffle is equipped with third diagonal and fourth diagonal, wherein the center of sixth round hole falls on the third diagonal, the center of fourth round hole with the center of fifth round hole all falls on the fourth diagonal.

3. A box-type exhaust gas aftertreatment device according to claim 2, wherein: the shell is provided with an exhaust inlet, an inlet cavity communicated with the exhaust inlet, a first connecting cavity, a second connecting cavity, an outlet cavity and an exhaust outlet communicated with the outlet cavity; the first catalyst carrier assembly is communicated with the inlet cavity, the first connecting cavity is communicated with the second catalyst carrier assembly and one end of the mixing assembly, the second connecting cavity is communicated with the other end of the mixing assembly and is further communicated with one end of the third catalyst carrier assembly, and the other end of the third catalyst carrier assembly is communicated with the outlet cavity.

4. A box-type exhaust gas aftertreatment device according to claim 3, wherein: the shell is provided with a first convex hull welded on the second baffle, and the first connecting cavity is formed between the first convex hull and the second baffle.

5. A box-type exhaust gas after-treatment device according to claim 4, characterized in that: the shell is provided with a second convex hull welded on the first baffle, and the second connecting cavity is formed between the second convex hull and the first baffle.

6. A box-type exhaust gas after-treatment device according to claim 5, characterized in that: the mixing assembly comprises a sleeve part welded on the periphery of the sixth circular hole, and an expansion cavity communicated with the first connecting cavity is formed in the sleeve part; the mixing assembly further includes a mixing tube extending through the sleeve portion and provided with a swirl plate at least partially disposed in the expansion chamber.

7. A box-type exhaust gas after-treatment device according to claim 6, characterized in that: the mixing assembly comprises a taper pipe welded on the periphery of the third round hole, the small diameter of the taper pipe is welded with the mixing pipe, and the large diameter of the taper pipe is the same as the diameter of the sleeve part.

8. A box-type exhaust gas aftertreatment device according to claim 1, wherein: the first catalyst carrier component comprises an oxidation-type catalytic converter, the second catalyst carrier component comprises a particulate trap, and the third catalyst carrier component comprises a selective catalytic reduction agent.