CN112081646A

CN112081646A - Tail gas treatment mixing arrangement and tail gas treatment system

Info

Publication number: CN112081646A
Application number: CN202010996317.0A
Authority: CN
Inventors: 王帅; 赵治国; 张敏
Original assignee: Zhejiang Yinlun Machinery Co Ltd
Current assignee: Zhejiang Yinlun Machinery Co Ltd
Priority date: 2020-09-21
Filing date: 2020-09-21
Publication date: 2020-12-15
Anticipated expiration: 2040-09-21
Also published as: CN112081646B

Abstract

A tail gas treatment mixing device and a tail gas treatment system relate to the technical field of tail gas treatment. The tail gas treatment mixing device comprises a mixing shell, a mixer assembly and a urea nozzle mounting seat; the mixing shell is provided with a shell inner chamber, and the mixing shell is provided with a shell inlet, a shell outlet and a shell urea port which are communicated with the shell inner chamber; the mixer component comprises an inlet pipe, a connecting mixing pipe and a cyclone pipe which are sequentially communicated; the inlet pipe is fixed at the inlet of the shell, and the cyclone tube corresponds to the outlet of the shell, so that fluid flowing in from the inlet pipe flows out from the outlet of the shell through the connecting mixing tube and the cyclone tube in sequence; the urea nozzle mounting seat is fixed at a urea port of the shell and communicated with the connecting mixing pipe. The tail gas treatment system comprises a tail gas treatment mixing device. The invention aims to provide a tail gas treatment mixing device and a tail gas treatment system, which solve the technical problem of uneven mixing of urea and tail gas in the prior art to a certain extent.

Description

Tail gas treatment mixing arrangement and tail gas treatment system

Technical Field

The invention relates to the technical field of tail gas treatment, in particular to a tail gas treatment mixing device and a tail gas treatment system.

Background

Diesel engines contain a large amount of nitrogen oxides (NOx) in the exhaust gas, the main constituents of which are NO and NO₂NO emitted to the atmosphere can be oxidized to NO₂Causing the phenomenon of intense discomfort of the respiratory system of the human body and the like. In addition, NOx can form acid rain and photochemical smog that can have an impact on the environment. With the development of society, the discharge amount of nitrogen oxides (NOx) is more and more severe. At present, selective catalytic reduction systems (SCR systems) are commonly used in vehicle exhaust aftertreatment technology to reduce nitrogen oxide (NOx) emissions. The basic principle of SCR is that urea aqueous solution with certain concentration is atomized by a urea injection system (commonly called a urea pump) and then injected into an exhaust pipe to be mixed with engine exhaust, and the urea aqueous solution is subjected to pyrolysis and hydrolysis reaction to generate ammonia (NH)₃) Under the action of catalyst, the ammonia gas converts harmful nitrogen oxide (NOx) in the tail gas of diesel engine into harmless nitrogen gas (N)₂) And water.

The uniformity of the urea and tail gas distribution in the exhaust line after mixing has an important influence on the overall performance and durability of the SCR system. If the urea is not uniformly mixed with the tail gas, the phenomena of low nitrogen oxide conversion efficiency in partial regions, nonuniform catalyst aging and the like can be caused, and the overall performance of the catalyst is affected. In addition, the uneven mixing of urea and exhaust gas can cause serious urea crystallization in the exhaust pipeline to block the exhaust passage, so that the performance of the engine is reduced.

Disclosure of Invention

The invention aims to provide a tail gas treatment mixing device and a tail gas treatment system, which solve the technical problem of uneven mixing of urea and tail gas in the prior art to a certain extent.

In order to achieve the purpose, the invention provides the following technical scheme:

a tail gas treatment mixing device comprises a mixing shell, a mixer assembly and a urea nozzle mounting seat;

the mixing shell is provided with a shell inner chamber, and the mixing shell is provided with a shell inlet, a shell outlet and a shell urea port which are communicated with the shell inner chamber;

the mixer component comprises an inlet pipe, a connecting mixing pipe and a cyclone pipe which are sequentially communicated; the connecting mixing pipe and the cyclone pipe are respectively arranged in the mixing shell; the inlet pipe is fixed at the inlet of the shell, and the cyclone tube corresponds to the outlet of the shell, so that fluid flowing in from the inlet pipe sequentially passes through the connecting mixing tube and the cyclone tube and then flows out from the outlet of the shell;

the urea nozzle mounting seat is fixed at the shell urea port, and the urea nozzle mounting seat is communicated with the connecting and mixing pipe.

In any of the above solutions, optionally, the inlet pipe is a reducer pipe; the inlet diameter of the inlet pipe is greater than the outlet diameter of the inlet pipe; the outlet of the inlet pipe is communicated with the connecting and mixing pipe.

In any of the above technical solutions, optionally, the swirl tube is provided with at least one fin set; when the number of the fin groups is multiple, the fin groups are sequentially arranged at intervals along the axial direction of the cyclone tube;

each of the fin groups includes a plurality of fins; the plurality of fins are arranged on the tube wall of the cyclone tube along the circumferential direction of the cyclone tube;

the wall of the cyclone tube is provided with a plurality of cyclone outlets; each swirl outlet corresponds to one fin.

In any of the above technical solutions, optionally, one end of the swirl tube is communicated with the connecting mixing tube along the axial direction of the swirl tube;

and/or the chord tangent angle of the fin is 20-45 degrees.

In any of the above solutions, optionally, the number of the fin sets is 3;

the chord cutting angle of the fins is 22.5-40 degrees, the length of the fins is 75-140 mm, and each fin group comprises 12-16 fins;

the tube wall of the cyclone tube is formed into the fin by adopting a stamping process.

In any of the above solutions, optionally, the mixer assembly comprises a transition pipe; the transition pipe is communicated with the connecting mixing pipe and the cyclone pipe; the diameter of the pipe orifice of the transition pipe connected with the connecting mixing pipe is larger than that of the pipe orifice of the transition pipe connected with the rotational flow pipe;

the mixer assembly includes a support plate; the support plate is fixedly connected with the inner wall of the mixing shell; the support plate is sleeved on the periphery of the transition pipe or the connecting mixing pipe.

In any of the above technical solutions, optionally, the support plate divides the inner cavity of the shell into a shell inlet cavity and a shell outlet cavity;

a support plate through hole for communicating the shell air inlet cavity with the shell air outlet cavity is formed in the support plate;

the inlet pipe is provided with an inlet pipe through hole communicated with the shell air inlet cavity;

the shell inlet and the shell outlet are both arranged on the same surface of the mixing shell, the shell urea port is arranged on the other surface of the mixing shell, and the surface where the shell inlet is arranged is vertical to the surface where the shell urea port is arranged.

In any of the above technical solutions, optionally, the connecting mixing pipe is a rectangular pipe;

the inlet pipe is arranged on the pipe wall of the connecting and mixing pipe;

and the urea nozzle mounting seat is arranged at one end of the connecting and mixing pipe along the extending direction of the connecting and mixing pipe.

In any of the above technical solutions, optionally, the hybrid shell includes a shell body and a shell connector; the shell connecting body is fixedly connected with the shell body, and the shell connecting body and the shell body form the shell inner chamber;

the housing inlet and the housing outlet are disposed on a first body surface of the housing body;

the shell connecting body is arranged between the shell inlet and the shell outlet;

the shell urea port is arranged on the second body surface of the shell body, wherein the first body surface of the shell body is vertical to the second body surface;

and the outer side of the shell body is provided with a heat insulation material.

An exhaust gas treatment system comprises an exhaust gas treatment mixing device.

The invention has the following beneficial effects:

the tail gas treatment mixing device and the tail gas treatment system are characterized in that a urea nozzle mounting seat is connected with urea atomized solution, an inlet pipe of a mixer assembly is connected with engine tail gas, so that the engine tail gas and the urea atomized solution are mixed in a connecting mixing pipe, then are mixed by a cyclone pipe and are output to an inner shell chamber of a mixing shell, and are further mixed in the inner shell chamber of the mixing shell and then are discharged through a shell outlet of the mixing shell; this tail gas treatment mixing arrangement can make engine tail gas and urea atomized solution obtain the multiple mixing, has greatly improved the mixing degree of consistency of engine tail gas and urea atomized solution.

In order to make the aforementioned and other objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic structural diagram of a tail gas treatment mixing device according to an embodiment of the present invention;

FIG. 2 is a cross-sectional view of an exhaust treatment mixing device according to an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a mixer assembly according to an embodiment of the present invention;

fig. 4 is an exploded view of a mixer assembly according to an embodiment of the present invention.

Icon: 100-a mixer assembly; 110-an inlet tube; 111-inlet tube through hole; 120-connecting a mixing tube; 130-a transition tube; 140-a support plate; 141-support plate through holes; 150-swirl tubes; 151-fins; 200-a mixing housing; 210-a housing outlet; 220-housing air intake chamber; 230-housing outlet cavity; 240-shell body; 250-a shell linker; 300-urea nozzle mount.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or the orientations or positional relationships that the products of the present invention are conventionally placed in use, and are only used for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

Examples

Referring to fig. 1 to 4, an exhaust gas treatment mixing device is provided in the present embodiment, where fig. 1 is a schematic structural view of the exhaust gas treatment mixing device provided in the present embodiment, and fig. 3 is a schematic structural view of a mixer assembly provided in the present embodiment; fig. 2 is a sectional view of the exhaust gas treatment mixing device, and fig. 4 is an exploded view of the mixer assembly, for the sake of more clearly showing the structure.

The exhaust gas treatment mixing device provided by the embodiment is used for a mixing device of an engine exhaust gas after-treatment system, in particular to a mixing device of an engine exhaust gas after-treatment system of a diesel engine.

Referring to fig. 1-4, the exhaust treatment mixing device includes a mixing housing 200, a mixer assembly 100, and a urea nozzle mount 300.

The mixing housing 200 has an inner housing chamber, and the mixing housing 200 is provided with a housing inlet, a housing outlet 210, and a housing urea port that communicate with the inner housing chamber.

The mixer assembly 100 comprises an inlet pipe 110, a connecting mixing pipe 120 and a cyclone pipe 150 which are communicated in sequence; the connecting mixing pipe 120 and the cyclone pipe 150 are respectively arranged in the mixing shell 200; the inlet pipe 110 is fixed to a housing inlet of the hybrid housing 200 so that engine exhaust flows from the inlet pipe 110 into the exhaust treatment hybrid device.

The swirl tube 150 is positioned to correspond to the housing outlet 210 of the mixing housing 200 such that fluid flowing from the inlet tube 110 of the mixer assembly 100 flows through the mixing tube 120 and the swirl tube 150 in sequence and then flows out of the housing outlet 210.

The urea nozzle mount 300 is fixed to a case urea port of the mixing case 200, and the urea nozzle mount 300 communicates with the connecting mixing pipe 120. Alternatively, the urea nozzle mount 300 has a urea nozzle hole communicating with the connecting mixing pipe 120, and urea enters the connecting mixing pipe 120 from the urea nozzle hole to be mixed with engine exhaust gas in the connecting mixing pipe 120.

In the embodiment, the tail gas treatment mixing device is connected with the urea atomized solution through the urea nozzle mounting base 300, and is connected with the engine tail gas through the inlet pipe 110 of the mixer assembly 100, so that the engine tail gas and the urea atomized solution are mixed in the connecting mixing pipe 120, are mixed by the cyclone pipe 150 and are output to the inner shell chamber of the mixing shell 200, and are further mixed in the inner shell chamber of the mixing shell 200 and then are discharged through the shell outlet 210 of the mixing shell 200; this tail gas treatment mixing arrangement can make engine tail gas and urea atomized solution obtain the multiple mixing, has greatly improved the mixing degree of consistency of engine tail gas and urea atomized solution.

Referring to fig. 2-4, in an alternative embodiment, the inlet pipe 110 is a reducer pipe; the inlet diameter of the inlet pipe 110 is larger than the outlet diameter of the inlet pipe 110; the outlet of the inlet pipe 110 communicates with the connecting mixing pipe 120. The inlet pipe 110 is a reducer pipe, and the diameter of the inlet pipe 110 is larger than the diameter of the outlet of the inlet pipe 110, so as to increase the flow rate of the engine exhaust, that is, the flow rate of the engine exhaust before mixing with urea, thereby improving the mixing uniformity of the exhaust and the urea atomized solution.

Referring to fig. 2-4, in an alternative embodiment, the swirl tube 150 is provided with at least one fin set; when the number of the fin groups is plural, the plural fin groups are sequentially arranged at intervals along the axial direction of the swirl tube 150. Optionally, the number of fin groups is plural; adopt a plurality of fin groups, can make the mixed fluid form swirl air current, and then be convenient for tail gas and urea atomized solution in the mixed fluid more intensive mixing in limited space, can effectively prevent urea crystallization. Optionally, the number of fin groups is 3; the three-section fin group is adopted, so that urea and air flow can be fully mixed, and urea crystallization is prevented.

Optionally, each fin group comprises a plurality of fins 151; a plurality of fins 151 are provided on the wall of the swirl tube 150 in the circumferential direction of the swirl tube 150. Optionally, the fins 151 have a length of 75mm to 140 mm. For example, the fins 151 may have a length of 75mm, 80mm, 90mm, 100mm, 120mm, or 140 mm. Optionally, each fin group includes a number of fins 151 of 12-16, or other numbers. Through setting up the fin 151 of suitable quantity, length, can make the swirl air current that the mixed fluid formed intensive mixing tail gas and urea atomized solution more, can effectively prevent the urea crystallization.

Optionally, a plurality of cyclone outlets are arranged on the wall of the cyclone tube 150; each swirl outlet corresponds to one fin 151; the mixed fluid flowing out through the rotational flow outlet changes the flowing direction of the mixed fluid through the fins 151, and the mixing uniformity of the tail gas and the urea atomization solution in the mixed fluid is further improved.

Optionally, the tube wall of the swirl tube 150 is formed with fins 151 by stamping process to simplify the structure of the swirl tube 150, and facilitate the production and processing of the swirl tube 150.

Alternatively, the plurality of fins 151 of each fin group are opened in the same direction. Optionally, the plurality of fins 151 of all fin sets open in the same direction to provide better mixing of the exhaust gas with the urea atomized solution in the mixed fluid.

Alternatively, the fins 151 of all the fin groups are opened in a clockwise direction, or the fins 151 of all the fin groups are opened in a counterclockwise direction.

Referring to fig. 1 to 4, in an alternative embodiment, one end of the swirl tube 150 is in communication with the connecting and mixing tube 120 in the axial direction of the swirl tube 150; that is, the mixed fluid flowing into the swirling tube 150 from the connecting mixing tube 120 is perpendicular to the direction of the mixed fluid flowing out from the swirling outlet of the swirling tube 150, thereby improving the mixing uniformity of the tail gas and the urea atomized solution in the mixed fluid. Wherein, the mixed fluid that flows out from the whirl export of whirl pipe 150 changes the direction and forms the whirl through fin 151, improves the mixed degree of consistency of tail gas and urea atomized solution in the mixed fluid once more.

Optionally, the fins 151 have a chordal angle of 20 ° to 45 °. For example, the fins 151 have a chord tangent angle of 20 °, 23 °, 28 °, 30 °, or 45 °. Optionally, the fins 151 have a chordal angle of 22.5 ° to 40 °. Wherein, the chord tangent angle of the fin 151 is the included angle between the fin 151 and the tangent of the cyclone tube 150.

Referring to fig. 2-4, in an alternative to the present embodiment, the mixer assembly 100 includes a transition duct 130; the transition pipe 130 is communicated with the mixing pipe 120 and the cyclone pipe 150; the diameter of the pipe orifice of the transition pipe 130 connected with the connecting mixing pipe 120 is larger than that of the pipe orifice of the transition pipe 130 connected with the cyclone pipe 150; through transition pipe 130 to mixing tube 120 and cyclone tube 150 are connected in better linking, can also promote the velocity of flow that flows out the mixed fluid of transition pipe 130 to a certain extent, thereby improve the mixing homogeneity of tail gas and urea atomizing solution.

Referring to fig. 2-4, in an alternative to the present embodiment, the mixer assembly 100 includes a support plate 140; the support plate 140 is fixedly connected with the inner wall of the mixing housing 200; the support plate 140 is externally fitted over the transition pipe 130 or the connecting mixing pipe 120. The vibration resistance of the exhaust gas treatment mixing device is improved by the support plate 140.

Optionally, the support plate 140 is welded to the inner wall of the hybrid case 200. Optionally, the support plate 140 is welded to the transition tube 130 or the connecting mixing tube 120.

Referring to fig. 1 and 2, in an alternative to the present embodiment, the support plate 140 divides the shell interior chamber of the mixing shell 200 into a shell inlet chamber 220 and a shell outlet chamber 230.

The support plate 140 is provided with a support plate through hole 141 for communicating the housing inlet cavity 220 and the housing outlet cavity 230; through the support plate through hole 141, the phenomenon that the housing air inlet cavity 220 generates large back pressure is reduced.

Optionally, the inlet pipe 110 is provided with an inlet pipe through hole 111 communicating with the housing inlet chamber 220; the air pressure of the housing inlet chamber 220 is further reduced by the inlet pipe through holes 111. In addition, a small amount of engine exhaust flows into the shell air inlet cavity 220 through the inlet pipe through hole 111 and flows into the shell air outlet cavity 230 through the support plate through hole 141, so that the detention of mixed gas near the support plate 140 is reduced, urea crystallization can be prevented to a certain extent, and the mixing uniformity of the exhaust and urea atomization solution in the mixed fluid can be improved.

In an alternative of this embodiment, the housing inlet and the housing outlet 210 of the mixing housing 200 are both disposed on the same surface of the mixing housing 200, i.e., the inlet pipe 110 of the mixer assembly 100 and the housing outlet 210 of the mixing housing 200 are disposed on the same surface of the mixing housing 200.

The shell urea port of the mixing shell 200 is arranged on the other surface of the mixing shell 200, and the surface where the shell inlet is arranged is vertical to the surface where the shell urea port is arranged; i.e., the surface on which the urea nozzle mount 300 is located is perpendicular to the surface on which the housing inlet and the housing outlet 210 of the mixing housing 200 are located. Through the casing entry and the casing export 210 all setting up on the same surface of mixing casing 200, the casing urea mouth sets up on the surface perpendicular with the surface that the casing entry was located to improve the mixed degree of consistency of tail gas and urea atomized solution.

Optionally, the hybrid case 200 includes a case body 240 and a case connector 250; the case connection body 250 is fixedly connected with the case body 240, and the case connection body 250 and the case body 240 form a case inner chamber. Optionally, the housing connector 250 is welded to the housing body 240. The structure of the hybrid case 200 is simplified by the case body 240 and the case connection body 250, so that the assembly of the exhaust gas treatment hybrid device is facilitated.

The housing inlet and outlet 210 are disposed at a first body surface of the housing body 240; a housing interface 250 is provided between the housing inlet and the housing outlet 210.

The housing urea port is disposed on a second body surface of the housing body 240, wherein the first body surface of the housing body 240 is perpendicular to the second body surface. Set up the first body surface at shell body 240 through casing entry and casing export 210, the casing urea mouth sets up the second body surface at shell body 240, and first body surface is perpendicular with second body surface to improve the mixed degree of consistency of tail gas and urea atomized solution.

Optionally, the support plate 140 is fixedly coupled to the housing coupling body 250. Optionally, the support plate 140 is welded to the shell connector 250 to improve the vibration resistance of the exhaust treatment mixing device.

Optionally, the outer side of the shell body 240 is provided with a thermal insulation material; the temperature loss of the air flow is reduced through the heat insulation material, so that the urea atomization effect can be improved, the mixing uniformity of the air flow and the urea can be improved, and the risk of urea crystallization can be reduced.

Referring to fig. 1 to 4, in an alternative embodiment, the connecting and mixing pipe 120 is a rectangular pipe, but may be a pipe with other shapes.

In an alternative of this embodiment, the inlet tube 110 is provided on the wall of the tube to which the mixing tube 120 is attached.

In an alternative of the present embodiment, the urea nozzle mount 300 is provided at one end of the connecting-mixing pipe 120 in the extending direction of the connecting-mixing pipe 120. It can be understood that the axis of the inlet pipe 110 is perpendicular to the axial direction of the urea nozzle mounting base 300, so that the direction of the tail gas flowing from the inlet pipe 110 is perpendicular to the spraying direction of the urea atomization solution flowing from the urea nozzle mounting base 300, and the mixing uniformity of the tail gas and the urea atomization solution is improved.

This embodiment mixing arrangement is handled to tail gas can effectively solve the fluid that exists among the prior art and easily produce to be detained, the disturbance effect is relatively poor, the mixed effect of tail gas and urea is relatively poor, concentration distribution is inhomogeneous, lead to urea crystallization scheduling problem easily, can be so that the urea of injection and tail gas obtain abundant mixture, can not produce very big backpressure again, can also prevent the urea crystallization.

The embodiment provides an exhaust gas treatment system, which comprises the exhaust gas treatment mixing device; the mixing uniformity of the engine tail gas and the urea atomized solution can be effectively improved.

The exhaust gas treatment system provided by the embodiment includes the exhaust gas treatment mixing device, and the technical features of the disclosed exhaust gas treatment mixing device are also applicable to the exhaust gas treatment system, and the technical features of the disclosed exhaust gas treatment mixing device are not described repeatedly. The advantages of the above-mentioned tail gas treatment mixing device are provided in the tail gas treatment system in this embodiment, and the advantages of the above-mentioned disclosed tail gas treatment mixing device will not be described repeatedly herein.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The tail gas treatment mixing device is characterized by comprising a mixing shell, a mixer assembly and a urea nozzle mounting seat;

2. The exhaust treatment mixing device of claim 1, wherein the inlet pipe is a reducer pipe; the inlet diameter of the inlet pipe is greater than the outlet diameter of the inlet pipe; the outlet of the inlet pipe is communicated with the connecting and mixing pipe.

3. The exhaust gas treatment mixing device of claim 1, wherein the swirl tube is provided with at least one fin set; when the number of the fin groups is multiple, the fin groups are sequentially arranged at intervals along the axial direction of the cyclone tube;

4. The exhaust gas treatment mixing device of claim 3, wherein one end of the swirl tube is in communication with the connecting mixing tube in an axial direction of the swirl tube;

and/or the chord tangent angle of the fin is 20-45 degrees.

5. The exhaust gas treatment mixing device of claim 4, wherein the number of fin groups is 3;

6. The exhaust treatment mixing device of any of claims 1-5, wherein the mixer assembly comprises a transition duct; the transition pipe is communicated with the connecting mixing pipe and the cyclone pipe; the diameter of the pipe orifice of the transition pipe connected with the connecting mixing pipe is larger than that of the pipe orifice of the transition pipe connected with the rotational flow pipe;

7. The exhaust treatment mixing device of claim 6, wherein the support plate divides the housing inner chamber into a housing inlet chamber and a housing outlet chamber;

8. The exhaust gas treatment mixing device according to any one of claims 1 to 5, wherein the connecting mixing pipe is a rectangular pipe;

the inlet pipe is arranged on the pipe wall of the connecting and mixing pipe;

9. The exhaust treatment mixing device of any one of claims 1-5, wherein the mixing housing comprises a housing body and a housing interface; the shell connecting body is fixedly connected with the shell body, and the shell connecting body and the shell body form the shell inner chamber;

10. An exhaust gas treatment system comprising an exhaust gas treatment mixing device according to any one of claims 1 to 9.