CN214261427U - Mixer and tail gas treatment system - Google Patents

Abstract

The utility model belongs to the technical field of the tail gas treatment technique and specifically relates to a blender and tail gas treatment system are related to. The mixer comprises a cylinder body, and a porous medium and a finned tube which are positioned in the cylinder body; the finned tube is inserted into the barrel through the interface, a finned tube connecting piece is arranged at one end of the finned tube, and the finned tube connecting piece is detachably connected with the barrel connecting piece; the porous medium is connected with the other end of the finned tube. When the porous medium is blocked or the porous medium and the finned tube need to be maintained and replaced, the barrel connecting piece and the finned tube connecting piece are disassembled, the finned tube and the porous medium are disassembled from the barrel body for corresponding maintenance, the mixer does not need to be integrally replaced, the use cost is reduced, and the maintenance cost is reduced.

Description

Mixer and tail gas treatment system

Technical Field

The utility model belongs to the technical field of the tail gas treatment technique and specifically relates to a blender and tail gas treatment system are related to.

Background

The diesel engine tail gas after-treatment technology is an off-board tail gas purification technology which utilizes the chemical principle of selective catalytic reduction to purify tail gas, can effectively improve the NOx emission of a diesel engine, and is insensitive to the sulfur content of diesel. According to the technology, a reducing agent with a certain concentration is sprayed into a mixer, tail gas is introduced, and the reducing agent and the tail gas are uniformly mixed and then enter a subsequent reaction unit for reaction, so that the effect of tail gas purification is realized.

A mixer comprises a cylinder body, and a porous medium and a finned tube which are arranged in the cylinder body, wherein the porous medium and the finned tube have the functions of crushing urea particles, exchanging heat, reducing crystallization and improving mixing effect. At present, the porous medium and the finned tube are welded and fixed with the cylinder body, when the porous medium is blocked, the whole mixer needs to be dismantled and replaced, and the maintenance cost is high.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide to solve exist among the prior art to a certain extent and when porous medium blockked up, need demolish whole blender, change the higher technical problem of maintenance cost.

The utility model provides a mixer, include: the device comprises a cylinder body, a porous medium and a finned tube, wherein the porous medium and the finned tube are positioned in the cylinder body; the finned tube is inserted into the barrel through the interface, a finned tube connecting piece is arranged at one end of the finned tube, and the finned tube connecting piece is detachably connected with the barrel connecting piece; the porous medium is connected with the other end of the finned tube.

Further, the cylinder comprises an outer cylinder and an inner cylinder; in the axial direction of the cylinder body, one end of the inner cylinder is opened to form an air inlet end, and the other end of the inner cylinder is closed; in the radial direction of the cylinder, the outer cylinder and the inner cylinder are arranged at intervals to form a mixed gas outlet chamber, and one end of the mixed gas outlet chamber, which is far away from the gas inlet end of the inner cylinder, is provided with an opening to form a gas outlet end; the finned tube and the porous medium are positioned in the inner cylinder, and one end of the porous medium, which is far away from the finned tube, is communicated with a mixed gas outlet chamber; and one end of the finned tube, which is far away from the porous medium, is provided with a nozzle.

Further, the cylinder connecting piece comprises a cylinder fixing part and a cylinder external connecting part which are connected with each other, and the cylinder fixing part is connected with the cylinder; the finned tube connecting piece comprises a finned tube fixing part and a finned tube external connection part which are connected with each other, and the finned tube fixing part is connected with the finned tube; in the axial direction of the finned tube, the barrel external connection part is positioned below the finned tube external connection part, and the barrel external connection part is connected with the finned tube external connection part through an anchor ear.

Furthermore, the barrel fixing part and the barrel external part are both arranged in a plate shape, and one side of the barrel external part, which is far away from the barrel fixing part, is far away from the barrel; the external connection part of the finned tube is an annular plate, a U-shaped groove is formed in the annular plate, and the two support plates are connected to the hoops on the two sides of the annular plate respectively.

Furthermore, a first connecting ring is arranged on the outer wall of the finned tube, a second connecting ring is arranged at the bottom of the inner tube, and the first connecting ring is connected with the second connecting ring.

Furthermore, a plurality of L-shaped connecting arms arranged at intervals are arranged on the first connecting ring along the circumferential direction of the first connecting ring; a plurality of inverted L-shaped connecting arms arranged at intervals are arranged on the second connecting ring along the circumferential direction of the second connecting ring; the L-shaped connecting arm is connected with the inverted L-shaped connecting arm in a clamping mode.

Furthermore, one end of the mixed gas outlet chamber, which is close to the gas inlet end of the inner cylinder, is provided with an annular connecting plate, one side of the annular connecting plate is connected with the inner cylinder, and the other side of the annular connecting plate is connected with the outer cylinder; and the annular connecting plate is provided with an air inlet end pressure relief hole.

Furthermore, a reinforcing plate is arranged at the gas outlet end of the mixed gas outlet chamber; one end of the reinforcing plate is connected with the inner cylinder, and the other end of the reinforcing plate is connected with the outer cylinder; and the reinforcing plate is provided with a pressure relief hole at an air outlet end.

Further, the finned tube comprises a tube body, and a plurality of through holes and a plurality of windows which are arranged on the tube body, wherein the finned tube is arranged in the circumferential direction of the finned tube at intervals, each window is provided with a fin, and the fins extend in the direction far away from the tube body.

The utility model provides a tail gas treatment system, including admitting air unit, reaction unit and above-mentioned blender, admit air the unit with the reaction unit all communicates with the inside of barrel.

The utility model provides a mixer, which comprises a cylinder body, a porous medium and a finned tube, wherein the porous medium and the finned tube are positioned in the cylinder body; the finned tube is inserted into the barrel through the interface, a finned tube connecting piece is arranged at one end of the finned tube, and the finned tube connecting piece is detachably connected with the barrel connecting piece; the porous medium is connected with the other end of the finned tube.

The finned tube and the porous medium are connected into a whole, then the integral body is installed in the cylinder body through the interface on the cylinder body, and the cylinder body connecting piece on the cylinder body is detachably connected with the finned tube connecting piece on the finned tube. When the porous medium is blocked or the porous medium and the finned tube need to be maintained and replaced, the barrel connecting piece and the finned tube connecting piece are disassembled, the finned tube and the porous medium are disassembled from the barrel body for corresponding maintenance, the mixer does not need to be integrally replaced, the use cost is reduced, and the maintenance cost is reduced.

It is to be understood that both the foregoing general description and the following detailed description are for purposes of illustration and description and are not necessarily restrictive of the disclosure. The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate the subject matter of the disclosure. Together, the description and drawings serve to explain the principles of the disclosure.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a cross-sectional view of a mixer according to an embodiment of the present invention;

FIG. 2 is an enlarged view of the mixer shown in FIG. 1 at A;

fig. 3 is a schematic diagram of a mixer according to another embodiment of the present invention at a first viewing angle;

FIG. 4 is a schematic diagram of the mixer of FIG. 3 from a second perspective;

FIG. 5 is an exploded view of the mixer shown in FIG. 3;

FIG. 6 is a cut-away view of the mixer shown in FIG. 3;

FIG. 7 is an enlarged view of the mixer shown in FIG. 6 at B;

FIG. 8 is a schematic structural view of a drum in the mixer shown in FIG. 3;

FIG. 9 is a schematic view of the finned tube and porous media configuration of the mixer of FIG. 3.

Icon: 10-a cylinder body; 20-a porous medium; 30-finned tubes; 40-a barrel connector; 50-finned tube connections; 60-anchor ear; 70-a first connecting ring; 80-a second connecting ring; 100-a nozzle; 11-an inner cylinder; 12-an outer barrel; 13-mixed gas chamber; 14-a ring-shaped connecting plate; 15-reinforcing plates; 16-an interface; 17-mixed gas outlet; 31-a tube body; 32-a via hole; 33-a fin; 141-air inlet end pressure relief hole; 151-air outlet end pressure relief hole; 41-cylinder fixing part; 42-a barrel external connection part; 51-finned tube fixing parts; 52-finned tube external connection part; 61-outer ring; 62-inner ring.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention.

The components of the embodiments of the present invention, as 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 accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.

Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element 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," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

As shown in fig. 1 to 9, the present invention provides a mixer, comprising a cylinder 10, and a porous medium 20 and a finned tube 30 located in the cylinder 10; the barrel body 10 is provided with a connector 16, a barrel body connector 40 is fixed at the connector, the finned tube 30 is inserted into the barrel body 10 through the connector, a finned tube connector 50 is arranged at one end of the finned tube 30, and the finned tube connector 50 is detachably connected with the barrel body connector 40; the porous medium 20 is connected to the other end of the finned tube 30.

In this embodiment, the finned tube 30 and the porous medium 20 are connected into a whole, and then are installed in the cylinder 10 through the interface on the cylinder 10, and the cylinder connector 40 on the cylinder 10 is detachably connected with the finned tube connector 50 on the finned tube 30. When the porous medium 20 is blocked or the porous medium 20 and the finned tube 30 need to be repaired and replaced, the barrel connector 40 and the finned tube connector 50 are disassembled, and the finned tube 30 and the porous medium 20 are disassembled from the barrel 10 for corresponding maintenance, so that the mixer does not need to be integrally replaced, the use cost is reduced, and the maintenance cost is reduced.

Specifically, the mixer further includes a nozzle 100 (for injecting a reducing agent, such as urea, into the finned tube 30), the nozzle being disposed at an end of the finned tube 30 remote from the porous medium 20, the nozzle having one end for connection to an external reduction supply device and the other end extending into the finned tube 30. The cylinder 10 comprises an outer cylinder 12 and an inner cylinder 11; in the axial direction of the cylinder 10, one end of the inner cylinder 11 is opened to form an air inlet end, and the other end of the inner cylinder 11 is closed; in the radial direction of the cylinder 10, the outer cylinder 12 and the inner cylinder 11 are arranged at intervals to form a mixed gas outlet chamber, and one end of the mixed gas outlet chamber, which is far away from the gas inlet end of the inner cylinder 11, is opened to form a gas outlet end; the finned tube 30 and the porous medium 20 are positioned in the inner barrel 11, and one end of the porous medium 20 far away from the finned tube 30 is communicated with a mixed gas outlet chamber.

The finned tube 30 can be of a conventional structure, optionally, the finned tube 30 comprises a tube body 31 and a plurality of through holes 32 and a plurality of windows which are arranged on the tube body 31, the plurality of windows are arranged at intervals along the circumferential direction of the finned tube 30, each window is provided with a fin 33, the fins 33 extend in the direction far away from the tube body 31, and the finned tube 30 can improve the efficiency of converting urea into ammonia. Wherein, along the axial of finned tube, a plurality of trompils can set up the one side that is close to the finned tube connecting piece at a plurality of windowing.

In this embodiment, the axial direction of the finned tube 30 intersects with the axial direction of the cylinder 10, that is, the interface is disposed on the side wall of the cylinder 10, the finned tube 30 and the porous medium 20 penetrate through the interface and extend into the inner cylinder 11, the side wall of the inner cylinder 11 opposite to the side wall on which the interface is disposed is provided with a mixed gas outlet 17, and one end of the porous medium 20 far away from the finned tube 30 can penetrate through the mixed gas outlet 17 to communicate with the mixed gas chamber 13. Urea is sprayed into the finned tube 30 through the nozzle 100, the urea is converted into ammonia in the finned tube 30 and the porous medium 20, meanwhile, tail gas enters the finned tube 30 through the air inlet end of the inner tube 11, the ammonia is mixed with the tail gas, then enters the mixed gas chamber 13 through one end, far away from the finned tube 30, of the porous medium 20, and finally flows out of the air outlet end of the mixed gas chamber 13, so that the urea enters the reaction unit.

Wherein, the structural style of barrel connector 40 and the structural style of finned tube connector 50 all can be multiple, and corresponding detachable connection mode of barrel connector 40 and finned tube connector 50 has a plurality ofly, for example: the cylinder body connecting piece 40 and the finned tube connecting piece 50 are both annular connecting discs, connecting holes are correspondingly formed in the cylinder body connecting piece 40 and the finned tube connecting piece 50, and the cylinder body connecting piece 40 and the finned tube connecting piece 50 are fixedly connected through fasteners (such as bolts or screws); or, the cylinder connecting piece 40 is a connecting sleeve, internal threads are arranged in the connecting sleeve, the finned tube connecting piece 50 is an annular bulge arranged on the outer wall of the finned tube 30, external threads are arranged on the annular bulge, and the annular bulge is screwed in the connecting sleeve, so that the detachable connection of the cylinder connecting piece 40 and the finned tube connecting piece 50 is realized.

As an alternative, the cylinder connector 40 comprises a cylinder fixing part 41 and a cylinder external part 42 which are connected with each other, the cylinder fixing part 41 is connected (for example, welded) with the cylinder 10 (specifically, the outer cylinder 12); the finned tube connector 50 comprises a finned tube fixing part 51 and a finned tube external joint 52 which are mutually connected, wherein the finned tube fixing part 51 is connected (for example, welded) with the finned tube 30; in the axial direction of the finned tube 30, the tube body external connection part 42 is positioned below the finned tube external connection part 52, and the tube body external connection part 42 is connected with the finned tube external connection part 52 through an anchor ear 60.

In this embodiment, the hoop 60 is used for tightly holding the barrel external connection part 42 and the finned tube external connection part 52 to realize the connection between the barrel external connection part 42 and the finned tube external connection part 52, so that the detachable connection between the barrel connector 40 and the finned tube connector 50 is realized, and the detachable connection between the finned tube 30 and the barrel 10 is realized. The hoop 60 is used for connection, so that the barrel 10 and the finned tube 30 can be conveniently and quickly connected in a detachable mode, the mounting space can be saved by the detachable connection mode, and the capability of adapting to the mounting environment is strong.

The tube body circumscribed portion 42 is located below the fin tube circumscribed portion 52 in the axial direction of the fin tubes 30, and it is understood that the fin tube circumscribed portion 52 is located on the side of the tube body circumscribed portion 42 away from the inside of the tube body in the axial direction of the fin tubes. Optionally, the edge of the barrel external connection part 42 is flush with the edge of the finned tube external connection part 52, so that the hoop 60 can hold the finned tube external connection part and the finned tube external connection part tightly, and the connection is stable and firm.

It will be appreciated that the cartridge connector 40 and the fin tube connector 50 are both annular bodies, enabling the removable connection of the cartridge 10 and the fin tube 30, and ensuring the sealing therebetween.

As shown in fig. 1 and 2, the cylinder fixing portion 41 may be provided in a block shape, and the cylinder external connection portion 42 is a protrusion provided on an outer wall of the cylinder fixing portion 41; the finned tube fixing part 51 may be provided in a block shape, and the finned tube external connection part 52 is a protrusion provided on the outer wall of the finned tube fixing part 51; the upper wall of the tube body external connection portion 42 may directly abut against the lower wall of the fin tube external connection portion 52, or a spacer may be interposed between the upper wall of the tube body external connection portion 42 and the lower wall of the fin tube external connection portion 52.

Alternatively, as shown in fig. 6 and 7, the cylinder fixing portion 41 and the cylinder external portion 42 are both provided in a plate shape, and a side of the cylinder external portion 42 away from the cylinder fixing portion 41 is provided away from the cylinder 10; the finned tube external connection part 52 is an annular plate, a U-shaped groove is formed in the annular plate, and the two support plates are connected to the two sides of the annular plate respectively.

In this embodiment, the cylinder body external connection portion 42 and the cylinder body fixing portion 41 may be arranged at an obtuse angle; the fin tube fixing portion 51 and the fin tube external connection portion 52 generally form a structure of a zigzag shape, that is, the fin tube joint 50 has a plate-like structure having a hump, and the tube joint 40 and the fin tube joint 50 in the present embodiment are light in weight, which contributes to the weight reduction of the mixer. The external connection part of the cylinder body can be abutted against the lower part of the external connection part of the finned tube.

It should be noted that, the U-shaped groove formed in the external connection portion 52 of the finned tube may have a straight line shape, an arc shape, an inclined plane, etc.

It should be noted that, in order to achieve the alignment of the edge of the cylinder external connection portion 42 and the edge of the finned tube external connection portion 52 and avoid the excessive depth of the hump, the opening of the finned tube 30 may be flared, and the diameter of the flared opening of the opening is greater than the diameter of the outer edge of the finned tube.

Specifically, the hoop 60 may include an outer ring 61 and an inner ring 62 that are connected to each other (for convenience of description only, the hoop 60 is divided into the outer ring 61 and the inner ring 62, the outer ring 61 and the inner ring 62 are still an integral body), the upper side and the lower side of the inner ring 62 are both inclined toward the direction close to the axis of the finned tube, the upper side of the inner ring 62 is abutted against the upper wall of the finned tube outer joint, the lower side of the inner ring 62 is abutted against the lower wall of the cylinder outer joint, that is, the inner ring 62 wraps the cylinder outer joint 42 and the finned tube outer joint 50, so that the connection between the cylinder connector 40 and the finned tube connector 50 is firm.

Based on the above embodiment, the hoop 60 further comprises a gasket, one side of the gasket is abutted against the bottom of the external connection part of the cylinder, the other side of the gasket is abutted against the upper side of the external connection part 52 of the finned tube, and the hoop 60 is wrapped outside the gasket.

In this embodiment, the upside at the protruding position of finned tube coupling piece 50 is wrapped up to one side of gasket, and the opposite side of gasket will wrap up the external portion of barrel, and staple bolt 60 wraps up outside the gasket, sets up stability and the leakproofness that the gasket can improve the connection of barrel coupling piece 40 and finned tube coupling piece 50.

As shown in fig. 3, based on any of the above embodiments, further, a first connection ring 70 is provided on the outer wall of the finned tube 30, a second connection ring 80 is provided on the bottom of the inner tube 11, and the first connection ring 70 is connected with the second connection ring 80.

In this embodiment, the first connection ring 70 and the second connection ring 80 are connected to each other, so that the finned tube 30 and the porous medium 20 can be supported at a position of the inner cylinder 11 away from the interface, that is, one end of the finned tube 30 is connected to the interface of the cylinder 10, the other end of the finned tube 30 is connected to the inner wall of the cylinder 10, and both ends of the finned tube 30 are supported, so that the finned tube 30 can be stably and reliably mounted, the porous medium 20 can be indirectly stably and reliably mounted, and the stability of the mixer can be further improved. In addition, when the installation angle of the nozzle on the finned tube 30 is determined, the connection of the first connection ring 70 and the second connection ring 80 can indirectly fix the position of the nozzle, thereby improving the installation accuracy of the nozzle.

The structural form of the first connection ring 70 and the structural form of the second connection ring 80 may be various, for example: the bottom of the first connecting ring 70 is provided with an insert plate, the side wall of the insert plate is provided with a clamping protrusion, the upper part of the second connecting ring 80 is provided with a slot, the side wall of the slot is correspondingly provided with a clamping protrusion, and in the process of installing the finned tube 30, the insert plate on the first connecting ring 70 is inserted into the slot of the second connecting ring 80 until the clamping protrusion on the insert plate reaches the lower part of the clamping protrusion in the slot.

As an alternative, a plurality of L-shaped connecting arms are arranged on the first connecting ring 70 at intervals along the circumferential direction of the first connecting ring 70; along the circumferential direction of the second connecting ring 80, a plurality of inverted L-shaped connecting arms arranged at intervals are arranged on the second connecting ring 80; the L-shaped connecting arm is connected with the inverted L-shaped connecting arm in a clamping mode.

In this embodiment, the L-shaped connecting arms and the inverted-L-shaped connecting arms are arranged in pairs, and when the first connecting ring 70 and the second connecting ring 80 are connected, the L-shaped connecting portion of the first connecting ring 70 is inserted between two adjacent inverted-L-shaped connecting arm spaces on the second connecting ring 80, and then the finned tube 30 is rotated, so that the L-shaped connecting arms on the first connecting ring 70 and the inverted-L-shaped connecting arms on the second connecting ring 80 are hooked and fixed. The primary connecting ring 70 and the secondary connecting ring 80 of this structure are simple in structure and easy to install.

As shown in fig. 3, on the basis of any of the above embodiments, further, an annular connecting plate 14 is disposed at one end of the mixed gas outlet chamber close to the gas inlet end of the inner cylinder 11, one side of the annular connecting plate 14 is connected to the inner cylinder 11, and the other side of the annular connecting plate is connected to the outer cylinder 12; and an air inlet end pressure relief hole 141 is formed in the annular connecting plate 14.

In this embodiment, an annular connecting plate 14 is disposed at one end of the mixed gas chamber 13 close to the gas inlet end of the inner cylinder 11, so as to realize the connection and fixation of the inner cylinder 11 and the outer cylinder 12, and the inner cylinder 11 and the outer cylinder 12 may be concentrically disposed or eccentrically disposed. Set up inlet end pressure release hole on annular connecting plate 14 to can reduce the impact to barrel 10 when tail gas gets into inner tube 11, most tail gas gets into inner tube 11 in order to mix with the reductant, and only a small portion of tail gas passes through inlet end pressure release hole and gets into in the mist cavity 13 and mix here with the gas that has accomplished the mixture, then discharge the blender.

As shown in fig. 4, on the basis of the above embodiment, further, the gas outlet end of the mixed gas outlet chamber is provided with a reinforcing plate 15; one end of the reinforcing plate 15 is connected with the inner cylinder 11, and the other end of the reinforcing plate 15 is connected with the outer cylinder 12; and the reinforcing plate 15 is provided with an air outlet end pressure relief hole 151.

In this embodiment, a reinforcing plate 15 may be disposed at the gas outlet end of the mixed gas chamber 13, and the reinforcing plate 15 is located below (i.e., near the mixed gas outlet), so as to support the inner cylinder 11, thereby avoiding the cantilever of the inner cylinder 11, and similarly, a gas outlet end pressure relief hole is disposed on the reinforcing plate 15, thereby reducing the impact of the mixed gas on the reinforcing plate 15.

A reinforcing plate 15 is arranged at the gas outlet end of the mixed gas outlet chamber; one end of the reinforcing plate 15 is connected with the inner cylinder 11, and the other end of the reinforcing plate 15 is connected with the outer cylinder 12; and the reinforcing plate 15 is provided with a pressure relief hole at an air outlet end.

On the basis of the above embodiment, further, the utility model also provides a tail gas treatment system, including admitting air unit, reaction unit and above-mentioned blender, admit air the unit with the reaction unit all communicates with the inside of barrel 10.

In this embodiment, the tail gas enters the mixer through the gas inlet unit, is mixed with the reducing agent in the mixer, and then enters the reaction unit through the mixer. The finned tube 30 and the porous medium 20 are connected into a whole and then are installed in the cylinder 10 through an interface on the cylinder 10, and the cylinder connector 40 on the cylinder 10 is detachably connected with the finned tube connector 50 on the finned tube 30. When the porous medium 20 is blocked or the porous medium 20 and the finned tube 30 need to be repaired and replaced, the barrel connector 40 and the finned tube connector 50 are disassembled, and the finned tube 30 and the porous medium 20 are disassembled from the barrel 10 for corresponding maintenance, so that the mixer does not need to be integrally replaced, the use cost is reduced, and the maintenance cost is reduced. The maintenance cost of the tail gas treatment system provided by the embodiment is low.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention. In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description. Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments.

Claims (10)

1. A mixer, comprising: the device comprises a cylinder body, a porous medium and a finned tube, wherein the porous medium and the finned tube are positioned in the cylinder body; the finned tube is inserted into the barrel through the interface, a finned tube connecting piece is arranged at one end of the finned tube, and the finned tube connecting piece is detachably connected with the barrel connecting piece; the porous medium is connected with the other end of the finned tube.

2. The mixer of claim 1, wherein the cartridge comprises an outer barrel and an inner barrel; in the axial direction of the cylinder body, one end of the inner cylinder is opened to form an air inlet end, and the other end of the inner cylinder is closed; in the radial direction of the cylinder, the outer cylinder and the inner cylinder are arranged at intervals to form a mixed gas outlet chamber, and one end of the mixed gas outlet chamber, which is far away from the gas inlet end of the inner cylinder, is provided with an opening to form a gas outlet end; the finned tube and the porous medium are positioned in the inner cylinder, and one end of the porous medium, which is far away from the finned tube, is communicated with a mixed gas outlet chamber; and one end of the finned tube, which is far away from the porous medium, is provided with a nozzle.

3. The mixer of claim 2, wherein the cartridge connector includes a cartridge fixing portion and a cartridge circumscribing portion connected to each other, the cartridge fixing portion being connected to the cartridge; the finned tube connecting piece comprises a finned tube fixing part and a finned tube external connection part which are connected with each other, and the finned tube fixing part is connected with the finned tube; in the axial direction of the finned tube, the barrel external connection part is positioned below the finned tube external connection part, and the barrel external connection part is connected with the finned tube external connection part through an anchor ear.

4. The mixer of claim 3, wherein the cartridge fixing portion and the cartridge outer portion are each provided in a plate shape, and a side of the cartridge outer portion remote from the cartridge fixing portion is provided remote from the cartridge; the finned tube fixing part comprises two support plates, the finned tube external connection part is an annular plate, a U-shaped groove is formed in the annular plate, and the two support plates are connected to the two sides of the annular plate respectively.

5. A mixer according to any one of claims 2-4, wherein the finned tube is provided on its outer wall with a first connecting ring, the inner barrel is provided on its bottom with a second connecting ring, and the first connecting ring and the second connecting ring are connected.

6. The mixer of claim 5, wherein the first connecting ring is provided with a plurality of spaced L-shaped connecting arms along a circumferential direction of the first connecting ring; a plurality of inverted L-shaped connecting arms arranged at intervals are arranged on the second connecting ring along the circumferential direction of the second connecting ring; the L-shaped connecting arm is connected with the inverted L-shaped connecting arm in a clamping mode.

7. The mixer according to claim 2, wherein an annular connecting plate is provided at an end of the mixed gas outlet chamber close to the gas inlet end of the inner cylinder, one side of the annular connecting plate is connected to the inner cylinder, and the other side of the annular connecting plate is connected to the outer cylinder; and the annular connecting plate is provided with an air inlet end pressure relief hole.

8. The mixer of claim 7, wherein the outlet end of the mixed gas outlet chamber is provided with a reinforcing plate; one end of the reinforcing plate is connected with the inner cylinder, and the other end of the reinforcing plate is connected with the outer cylinder; and the reinforcing plate is provided with a pressure relief hole at an air outlet end.

9. The mixer of claim 1 wherein the finned tube comprises a tube body and a plurality of through holes and a plurality of windows disposed in the tube body, the plurality of windows being spaced apart in a circumferential direction of the finned tube, each window having a fin disposed thereon, the fin extending away from the tube body.

10. An exhaust gas treatment system comprising a gas inlet unit, a reaction unit and a mixer according to any one of claims 1 to 9, the gas inlet unit and the reaction unit both communicating with the interior of the barrel.

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