CN206129367U

CN206129367U - Exhaust aftertreatment device

Info

Publication number: CN206129367U
Application number: CN201621113320.9U
Authority: CN
Inventors: 殷雷
Original assignee: Tenneco Suzhou Emission System Co Ltd
Current assignee: Tenneco Suzhou Emission System Co Ltd
Priority date: 2016-10-12
Filing date: 2016-10-12
Publication date: 2017-04-26
Anticipated expiration: 2026-10-12

Abstract

The utility model provides an exhaust aftertreatment device which includes casing, blender subassembly and aftertreatment carrier. The casing is equipped with tail gas inlet channel and is used for installing the mount pad of urea nozzle. The urea nozzle is equipped with and is located its terminal jet orifice. Exhaust aftertreatment device still is equipped with the tail gas guidance part and at least part is encircleed the outlying separation blade of jet orifice, the tail gas guidance part be equipped with with the tail gas guiding channel that tail gas inlet channel is linked together. So set up, on the one hand, improved near the temperature in jet orifice, reduced urea crystallization's risk, on the other hand because whirl that the separation blade formed can be very fast drop is taken away spraying the urea liquid that comes out, has avoided the blind spot to urea crystallization's risk has also been reduced.

Description

Tail-gas after treatment apparatus

Technical field

This utility model is related to a kind of tail-gas after treatment apparatus, belongs to motor exhaust post-processing technology field.

Background technology

Research shows exhaust gas aftertreatment system（Such as selective catalytic reduction system operating, SCR system）Ammonia distribution in pipeline Uniformity coefficient has important impact to the overall performance and endurance quality of system.If ammonia skewness can cause regional area Ammonia causes oxynitride excessively so as to easily cause NH_3 leakage in other ammonia thin areas（NOx）Transformation efficiency is too low.It is long The uneven distribution of time ammonia can cause catalyst aging uneven, so as to affect the overall performance of catalyst.In addition, urea solution The uneven distribution of drop can cause local tube wall or mixed structure temperature too low, form crystallization, exhaustor can be blocked when serious, is led Engine power performance is caused to decline.

Therefore, it is necessary to a kind of new tail-gas after treatment apparatus are provided, to solve above-mentioned technical problem.

Utility model content

The purpose of this utility model is to provide a kind of tail-gas after treatment apparatus that can reduce urea crystals risk.

For achieving the above object, this utility model is adopted the following technical scheme that：

Used as the further improved technical scheme of this utility model, a kind of tail-gas after treatment apparatus, it includes housing, installs Mixer assembly and the post processing carrier positioned at the downstream of the mixer assembly in the housing；The housing is provided with Tail gas inlet channel and the mounting seat to install urea nozzle, the urea nozzle is provided with positioned at its end and to institute State the spray-hole that urea droplets are sprayed in mixer assembly；The tail-gas after treatment apparatus be additionally provided with exhaust gas guide portion and with institute State exhaust gas guide portion to be engaged and at least partially about the peripheral catch in the spray-hole, wherein the catch is near described Spray-hole, the exhaust gas guide portion is provided with the exhaust gas guide passage being connected with the tail gas inlet channel.

Used as the further improved technical scheme of this utility model, the mixer assembly includes mixing tube, the mixing Pipe is provided with the hybrid chamber that is connected with the tail gas inlet channel and to by into the tail gas and/or tail gas of the hybrid chamber With some spinning disks that the mixed airflow of urea droplets forms vortex flow.

Used as the further improved technical scheme of this utility model, the catch is in arc-shaped and positioned at the hybrid chamber Interior, the exhaust gas guide passage tangentially enters the inner surface of the catch to form eddy flow on the internal surface.

As the further improved technical scheme of this utility model, the C-shaped either O shapes of the catch or spiral type.

Used as the further improved technical scheme of this utility model, the mixing tube is cylindrical, the spinning disk be to Mixing tube described in outer punching press and formed, the spinning disk is distributed on the outer circumference surface of the mixing tube；The mixing tube sets Have and be open correspondingly with the spinning disk, the opening connects the hybrid chamber with the tail gas inlet channel.

Used as the further improved technical scheme of this utility model, the mixing tube is provided near the mounting seat and distribution Some perforates on the outer circumference surface, the perforate is located at the mounting seat and institute on the axis direction of the mixing tube State between spinning disk.

Used as the further improved technical scheme of this utility model, the housing is provided with the one end for being welded on the mixing tube On cover plate, the mounting seat is welded on the side of the cover plate, and the catch and/or the exhaust gas guide portion are welded on described The opposite side of cover plate.

Used as the further improved technical scheme of this utility model, the exhaust gas guide portion is fixed on the mixing tube, The exhaust gas guide passage is provided with the exhaust gas guide mouth being exposed on the mixing tube.

Used as the further improved technical scheme of this utility model, the mixer assembly is provided with positioned at the mixing tube bottom The bowl cover in portion and the Z-shaped dividing plate being engaged with the mixing tube, wherein the mixing tube includes being located at the air stream outlet of lower end, The housing is separated into the first cavity and the second cavity by the dividing plate, wherein first cavity connects with the hybrid chamber Logical, second cavity is connected with the air stream outlet, and the bowl cover is to force flow reversal.

As the further improved technical scheme of this utility model, the mixer assembly be provided with discoid installation portion with And some spoilers for protruding the installation portion and extending to the post processing carrier.

Compared to prior art, this utility model, can be at least straight by small part tail gas by arranging exhaust gas guide passage The vicinity for causing spray-hole is connect, and eddy flow is formed in the presence of catch.It is arranged such, on the one hand, improve near spray-hole Temperature, reduce the risk of urea crystals；On the other hand, because the eddy flow that catch is formed can will be ejected soon Urea droplets take away, it is to avoid dead band, so as to also reducing the risk of urea crystals.

Description of the drawings

Fig. 1 is the schematic perspective view of this utility model tail-gas after treatment apparatus.

Fig. 2 is the part isometric exploded view of Fig. 1.

Fig. 3 is the further three-dimensional exploded views of Fig. 2.

Fig. 4 is the schematic perspective view of the exhaust gas guide portion in Fig. 3 and catch.

Fig. 5 is the schematic perspective view of mixer assembly in Fig. 2.

Fig. 6 is the part isometric exploded view of Fig. 5.

Fig. 7 is the part isometric exploded view of another angles of Fig. 6.

Fig. 8 is the partial enlarged drawing of circled portion in Fig. 5.

Fig. 9 be mixer assembly in the part isometric exploded view of another embodiment, the wherein structure of catch slightly has with Fig. 6 It is different.

Figure 10 is the part isometric exploded view of another angles of Fig. 9.

Figure 11 is the generalized section of the line A-A along Fig. 1.

Figure 12 is generalized section of this utility model tail-gas after treatment apparatus in another embodiment.

Specific embodiment

Please join shown in Fig. 1 to Figure 11, this utility model discloses a kind of tail-gas after treatment apparatus 100, to process diesel oil The tail gas of electromotor, it includes housing 1, the mixer assembly 2 in the housing 1, positioned at the mixer assembly 2 The post processing carrier 3 in downstream and anti-urea crystals structure 4.Please join shown in Figure 11, in this utility model embodiment illustrated In, the post processing carrier 3 includes selective catalytic reducing agent（SCR）31 and NH_3 leakage catalyst converter（ASC）32.

The housing 1 is provided with tail gas inlet channel 11, the mounting seat 12 to install urea nozzle 5 and to weld State the cover plate 13 of mounting seat 12.The urea nozzle 5 is provided with positioned at its end and to the injection urine in the mixer assembly 2 The spray-hole 51 of plain drop.

In a kind of embodiment of the present utility model, the mixer assembly 2 is including mixing tube 21, positioned at the mixing The bowl cover 22 of the bottom of pipe 21 and the Z-shaped dividing plate 23 being engaged with the mixing tube 21.

In this utility model embodiment illustrated, the mixing tube 21 is cylindrical, and it is provided with and enters with the tail gas Hybrid chamber 211 that gas passage 11 is connected and to by into the tail gas and/or tail gas and urea droplets of the hybrid chamber 211 Mixed airflow formed vortex flow some spinning disks 212.Be arranged such, it is possible to increase the mixing of tail gas and urea droplets away from From improving mixed effect.The spinning disk 212 is mixing tube 21 described in outside punching press and is formed that the spinning disk 212 is distributed On the outer circumference surface of the mixing tube 21.The mixing tube 21 is provided with and the one-to-one opening 213 of the spinning disk 212, The opening 213 connects the hybrid chamber 211 with the tail gas inlet channel 11.In addition, the mixing tube 21 is provided with Near the mounting seat 12 and some perforates 214 on the outer circumference surface are distributed in, the perforate 214 is in the mixing tube 21 Axis direction on be located between the mounting seat 12 and the spinning disk 212.The perforate 214 can allow partial tail gas to be worn Cross, on the one hand improve the temperature near urea nozzle 5, reduce the risk of urea crystals；On the other hand, contribute to spraying Urea droplets out are taken away, so as to also reduce the risk of urea crystals.The mixing tube 21 also includes being located at the gas of lower end Flow export 215（Ginseng Figure 11）.

The housing 1 is separated into the first cavity 231 and the second cavity 232 by the dividing plate 23, wherein first chamber Body 231 is connected with the hybrid chamber 211, and second cavity 232 is connected with the air stream outlet 215.The bowl cover 22 to Force flow reversal, increased Urea Evaporation away from discrete time, improve the uniformity of air-flow mixing.

Please join shown in Fig. 4, the anti-urea crystals structure 4 is in this utility model embodiment illustrated as a mouth The whistle, it includes exhaust gas guide portion 41 and is engaged and at least partially about in the spray-hole 51 with the exhaust gas guide portion 41 Peripheral catch 42, wherein the catch 42 is near the spray-hole 51, the exhaust gas guide portion 41 is provided with and the tail gas The exhaust gas guide passage 411 that inlet channel 11 is connected.Preferably, the catch 42 is in arc-shaped and positioned at the hybrid chamber In 211.The exhaust gas guide passage 411 tangentially enters the inner surface of the catch 42 to be formed on the internal surface Eddy flow.It is arranged such, on the one hand, improve the temperature near spray-hole 51, reduces the risk of urea crystals；On the other hand, Because the eddy flow that catch 42 is formed soon can take away the urea droplets for ejecting, it is to avoid dead band, so as to also drop The low risk of urea crystals.The exhaust gas guide portion 41 can be one or more.

Please join shown in Fig. 4, in a kind of embodiment of the present utility model, the catch 42 is in O shapes.Please join Fig. 9 and figure Shown in 10, in another embodiment of the present utility model, the catch 42 is C-shaped.Certainly, the catch 42 can also be Spiral type etc. is every to be easily formed the variously-shaped of eddy flow.In other embodiments, the catch can also V-shaped grade other Shape.

The cover plate 13 is welded on one end of the mixing tube 21（Such as upper end）.The mounting seat 12 is welded on described The side of cover plate 13（Such as upside）, the catch 42 and/or the exhaust gas guide portion 41 are welded on the another of the cover plate 13 Side（Such as downside）.In this utility model embodiment illustrated, the exhaust gas guide portion 41 is fixed on the mixing tube 21 On.The exhaust gas guide passage 411 is provided with the exhaust gas guide mouth being exposed on the mixing tube 21.

Please join shown in Figure 12, aforementioned anti-urea crystals structure 4 can also be applied in this utility model tail-gas after treatment apparatus In 100 another embodiment.In both embodiments, identical number designation represents same or similar element.Can With understanding, the tail-gas after treatment apparatus 100 in second embodiment and the tail-gas after treatment apparatus 100 in first embodiment Framework is different, wherein in this second embodiment, mixer assembly 2 is provided with discoid installation portion 24 and protrudes the installation Portion 24 and some spoilers 25 extended to the post processing carrier 3.The spoiler 25 can improve the urea solution after atomization The mixing uniformity of drop and tail gas.

In addition, above example is merely to illustrate this utility model and not limits the technical side described by this utility model Case, understanding of this description should be based on person of ordinary skill in the field, although this specification is with reference to above-mentioned Embodiment has been carried out detailed description to this utility model, but, it will be understood by those within the art that, affiliated skill The technical staff in art field still can modify or equivalent to this utility model, and all are new without departing from this practicality The technical scheme of the spirit and scope of type and its improvement, all should cover in right of the present utility model.

Claims

1. a kind of tail-gas after treatment apparatus, it includes housing, the mixer assembly in the housing and positioned at described The post processing carrier in the downstream of mixer assembly；The housing is provided with tail gas inlet channel and the peace to install urea nozzle Dress seat, the urea nozzle is provided with positioned at its end and the spray-hole to spray urea droplets in the mixer assembly； It is characterized in that：The tail-gas after treatment apparatus are additionally provided with exhaust gas guide portion and are engaged with the exhaust gas guide portion and at least The peripheral catch in the spray-hole is partially surrounded, wherein the catch is near the spray-hole, the exhaust gas guide portion sets There is the exhaust gas guide passage being connected with the tail gas inlet channel.

2. tail-gas after treatment apparatus as claimed in claim 1, it is characterised in that：The mixer assembly includes mixing tube, institute State mixing tube be provided with the hybrid chamber that is connected with the tail gas inlet channel and to by into the tail gas of the hybrid chamber and/ Or tail gas forms some spinning disks of vortex flow with the mixed airflow of urea droplets.

3. tail-gas after treatment apparatus as claimed in claim 2, it is characterised in that：The catch is in arc-shaped and positioned at described mixed Intracavity is closed, the exhaust gas guide passage tangentially enters the inner surface of the catch to form rotation on the internal surface Stream.

4. tail-gas after treatment apparatus as claimed in claim 3, it is characterised in that：The C-shaped either O shapes of the catch or spiral Shape.

5. tail-gas after treatment apparatus as claimed in claim 2, it is characterised in that：The mixing tube is cylindrical, the eddy flow Piece is mixing tube described in outside punching press and is formed that the spinning disk is distributed on the outer circumference surface of the mixing tube；It is described mixed Conjunction pipe is provided with and is open correspondingly with the spinning disk, and the opening connects the hybrid chamber with the tail gas inlet channel Get up.

6. tail-gas after treatment apparatus as claimed in claim 5, it is characterised in that：The mixing tube is provided near the mounting seat And some perforates on the outer circumference surface are distributed in, the perforate is located at the installation on the axis direction of the mixing tube Between seat and the spinning disk.

7. tail-gas after treatment apparatus as claimed in claim 6, it is characterised in that：The housing is provided with and is welded on the mixing tube One end on cover plate, the mounting seat is welded on the side of the cover plate, and the catch and/or the exhaust gas guide portion weld In the opposite side of the cover plate.

8. tail-gas after treatment apparatus as claimed in claim 7, it is characterised in that：The exhaust gas guide portion is fixed on the mixing Guan Shang, the exhaust gas guide passage is provided with the exhaust gas guide mouth being exposed on the mixing tube.

9. tail-gas after treatment apparatus as claimed in claim 2, it is characterised in that：The mixer assembly is provided with positioned at described mixed The bowl cover for closing bottom of the tube and the Z-shaped dividing plate being engaged with the mixing tube, wherein the mixing tube includes being located at the gas of lower end The housing is separated into the first cavity and the second cavity by flow export, the dividing plate, wherein first cavity is mixed with described Chamber connection is closed, second cavity is connected with the air stream outlet, and the bowl cover is to force flow reversal.

10. tail-gas after treatment apparatus as claimed in claim 1, it is characterised in that：The mixer assembly is provided with discoid Installation portion and some spoilers for protruding the installation portion and extending to the post processing carrier.