Urea mixing device with split structure

Abstract

The invention provides a urea mixing device of a split structure. The urea mixing device comprises an air inlet mixing cavity, an air outlet mixing cavity and an integrated atomization cavity. The air inlet mixing cavity comprises an annular cylinder, a round hole and a flanging round hole are formed in the upper surface and the lower surface of the annular cylinder respectively, and a round end cover and an annular end cover are arranged at the two ends of the annular cylinder respectively; the air outlet mixing cavity comprises a circular barrel and a circular boss end cover; after the circular barrel and the circular boss end cover are assembled and connected, an integral flanging hole is formed in the upper end; the integrated atomization cavity comprises a hole pipe, an upper rotational flow pipe and a lower rotational flow pipe, the upper rotational flow pipe and the lower rotational flow pipe are located in the hole pipe, and the upper end of the hole pipe penetrates into the air inlet mixing cavity through a turnup round hole and is fixedly connected with the annular cylinder. The lower end of the hole pipe penetrates into the integral flanging hole, and the hole pipe is fixedly connected to the integral flanging hole. Round crushing plates are arranged at the lower ends of the hole pipes. The novel flow channel design and internal component layout are adopted, more efficient mixing performance is achieved in a limited space, and the emission standard of the catalytic converter is greatly improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of diesel engine exhaust gas treatment systems, and particularly relates to a split-structure urea mixing device. Background Art

[0002] With the development of diesel engine technology, in the SCR system, different mixer devices, as key components, undertake the important task of fully mixing urea solution with exhaust gas. The urea solution decomposes under the action of high-temperature exhaust gas to produce ammonia (NH3), and the ammonia reacts with (NOx) in the exhaust gas under the action of a catalyst to produce harmless nitrogen (N2) and water (H2O). However, the mixing effect of the urea solution and the exhaust gas directly affects the denitrification efficiency and operation stability of the SCR system. If the mixing is uneven, it will lead to too high or too low local urea concentration. Too high is likely to cause urea crystallization, blocking pipelines and catalysts, affecting the normal operation of the system; too low will result in insufficient reduction of NOx, leading to excessive emissions. Summary of the Invention

[0003] The purpose of the present invention is to overcome the deficiencies existing in the prior art and provide a split-structure urea mixing device. The present invention adopts a new flow channel design and internal component layout to achieve more efficient mixing performance within a limited space, greatly improving the emission compliance of the catalytic converter.

[0004] To achieve the above technical objectives, the technical solution adopted in the embodiments of the present invention is: A split-structure urea mixing device, comprising an intake mixing chamber, an outlet mixing chamber, and an integrated atomization chamber; The intake mixing chamber includes an annular cylinder body, and round holes and flanged round holes are respectively arranged on the upper and lower surfaces of the annular cylinder body. The round holes are used for installing a urea injection base, and a circular end cover and an annular end cover are respectively arranged at both ends of the annular cylinder body; The outlet mixing chamber includes a circular cylinder body and a circular convex end cover. After the circular cylinder body and the circular convex end cover are assembled and connected, an integral flanged hole is formed at the upper end; The integrated atomization chamber includes a hole tube, and an upper swirl tube and a lower swirl tube located inside the hole tube. Outer swirl fins are circumferentially and uniformly arranged on the upper swirl tube, and inner swirl fins are circumferentially and uniformly arranged on the lower swirl tube; The upper end of the hole tube penetrates into the intake mixing chamber through the flanged round hole and is fixedly connected to the annular cylinder body; the lower end of the hole tube penetrates into the integral flanged hole, and the hole tube is fixedly connected to the integral flanged hole; A circular breaking plate is arranged at the lower end of the hole tube, and there is a gap with a height of h1 between the circular breaking plate and the lower end of the hole tube.

[0005] Further, first arc-shaped slot holes are symmetrically arranged on the outer periphery of the round hole, and an arc-shaped protrusion is arranged at the upper end of the hole pipe. The arc-shaped protrusion can be inserted into the first arc-shaped slot holes to realize the connection between the hole pipe and the upper surface of the annular cylinder body.

[0006] Further, second arc-shaped slot holes are symmetrically arranged on the circular boss end cover; Turbulence arc plates are symmetrically arranged inside the circular cylinder body. The lower ends of the turbulence arc plates are attached to the circular cylinder body, and the arc-shaped slots arranged at the upper ends of the turbulence arc plates can be inserted into the second arc-shaped slot holes to realize the fixed connection between the turbulence arc plates and the circular boss end cover.

[0007] Further, both the upper swirl pipe and the lower swirl pipe are frustum-shaped. The size of the upper end of the upper swirl pipe is larger than that of its lower end, and the size of the lower end of the lower swirl pipe is larger than that of its upper end. The lower end of the upper swirl pipe is inserted into the upper end of the lower swirl pipe, and the upper swirl pipe and the lower swirl pipe are fixedly connected at the connection hole, and the connection hole is arranged at the upper end of the lower swirl pipe.

[0008] Further, a plurality of first round holes are evenly distributed circumferentially on the upper half of the hole pipe. The total area of the first round holes occupies 2 / 3 of the area of the upper half of the hole pipe. A plurality of second round holes are evenly distributed circumferentially on the lower half of the hole pipe. The total area of the second round holes occupies 1 / 3 of the area of the lower half of the hole pipe.

[0009] Further, rectangular arc slot holes are symmetrically arranged on the upper part of the hole pipe. An upper connection hole is arranged between the rectangular arc slot holes and the first round holes. The upper end of the upper swirl pipe and the hole pipe are fixedly connected at the upper connection hole; Crushing holes are evenly arranged on the circular crushing plate. A plurality of flanges are arranged circumferentially on the circular crushing plate. Flange connection holes are arranged on the flanges. A lower connection hole is arranged below the second round holes. The lower connection hole is arranged corresponding to the flange connection holes. The circular crushing plate, the hole pipe and the lower swirl pipe are fixedly connected at the flange connection holes and the lower connection holes.

[0010] Further, there is an intermediate gap between the two turbulence arc plates in the lower half circle of the circular cylinder body. The angle Ɛ of the intermediate gap is 30° - 50°, the central angle θ of the turbulence arc plate is 90° - 100°, and the radius R of the arc surface of the turbulence arc plate is 80 - 100 mm.

[0011] Further, the central angle α of the rectangular arc slot hole is 80° - 90°, and the height h is 30 - 50 mm; The taper angle β of the upper swirl pipe is 15° - 20°, and the taper angle γ of the lower swirl pipe is 15° - 20°.

[0012] Furthermore, the intake mixing chamber is connected to the DPF module through the flanging of the circular end cover, the outlet mixing chamber is connected to the end face of the SCR carrier through the flanging of the circular cylinder body, the upper and lower ends of the integrated atomization chamber are respectively located in the intake mixing chamber and the outlet mixing chamber, the gas at the rear end of the DPF module enters the intake mixing chamber in the horizontal direction, and after changing the direction in the integrated atomization chamber, it flows out horizontally from the outlet mixing chamber.

[0013] The beneficial effects brought by the technical solution provided by the embodiment of the present invention are as follows: 1. The split-structured urea mixing device of the present invention includes an intake mixing chamber, an outlet mixing chamber and an integrated atomization chamber; the upper end of the integrated atomization chamber is connected to the intake mixing chamber, and the lower end is connected to the outlet mixing chamber. The gas at the rear end of the DPF flows into the upper end of the intake mixing chamber and the integrated atomization chamber. After the front and rear airflows are disturbed and atomized by the upper and lower swirl tubes in the integrated atomization chamber, the airflows then flow into the outlet mixing chamber from the arranged small holes and the breaking plate at the lower end of the integrated atomization chamber, and arc back from the upper surfaces of the left and right turbulence arc plates at the bottom of the outlet mixing chamber to the end face of the SCR carrier. The lower surfaces of the left and right turbulence arc plates form an air flow chamber to convey the air flow to the middle notch, reducing urea crystallization at the bottom of the outlet mixing chamber. This structure can improve its mixing performance, which is of crucial significance for enhancing the overall performance of the SCR system and reducing NOx emissions in vehicle exhaust.

[0014] 2. The split-structured urea mixing device of the present invention enables the airflows to be more evenly distributed in the chamber, reduces the generation of flow dead zones, and effectively realizes the uniform mixing of urea solution and tail gas, reducing nitrogen oxide emissions.

[0015] 3. The modular structure of the split-structured urea mixing device of the present invention can simplify the production and manufacturing processes and improve production efficiency. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the split-structured urea mixing device in the embodiment of the present invention.

[0017] Figure 2 It is the front view of the split-structured urea mixing device in the embodiment of the present invention.

[0018] Figure 3 It is the schematic top view structure diagram of the split-structured urea mixing device in the embodiment of the present invention.

[0019] Figure 4 is Figure 1 The schematic structural diagram of the intake mixing chamber in the split-structured urea mixing device.

[0020] Figure 5 is Figure 4 The exploded structural diagram of the intake mixing chamber.

[0021] Figure 6 It is Figure 1 A schematic structural view of the gas outlet mixing chamber in the split-structured urea mixing device.

[0022] Figure 7 It is Figure 6 An exploded structural view of the gas outlet mixing chamber.

[0023] Figure 8 It is Figure 7 A front view of the spoiler arc plate in the gas outlet mixing chamber.

[0024] Figure 9 It is Figure 1 A schematic structural view of the integrated atomization chamber in the split-structured urea mixing device.

[0025] Figure 10 It is Figure 1 A cross-sectional view of the integrated atomization chamber in the split-structured urea mixing device.

[0026] Figure 11 It is Figure 9 A schematic structural view of the hole tube in the integrated atomization chamber.

[0027] Figure 12 It is Figure 11 A schematic cross-sectional structural view of the hole tube.

[0028] Figure 13 It is Figure 9 A schematic structural view of the assembled upper swirl tube and lower swirl tube in the integrated atomization chamber.

[0029] Figure 14 It is Figure 13 A schematic structural view of the upper swirl tube.

[0030] Figure 15 It is Figure 13 A schematic structural view of the lower swirl tube.

[0031] Figure 16 It is Figure 9 A schematic structural view of the circular crushing plate in the integrated atomization chamber.

[0032] Figure 17 It is Figure 16 A top view of the circular crushing plate.

[0033] Figure 18 It is a schematic view of the gas flow in the split-structured urea mixing device.

[0034] Description of reference numerals: 1 - intake mixing chamber; 2 - outlet mixing chamber; 3 - integrated atomization chamber; 11 - annular cylinder; 12 - urea injection base; 13 - annular end cap; 14 - circular end cap; 11a - first arc-shaped slot hole; 110 - round hole; 111 - flanged round hole; 21 - circular cylinder; 22 - flow disturbing arc plate; 23 - circular boss end cap; 24 - integral flanged hole; 22a - arc surface; 22b - arc-shaped slot; 23a - second arc-shaped slot hole; 221 - middle notch; 31 - hole pipe; 32 - upper swirl pipe; 33 - lower swirl pipe; 34 - circular crushing plate; 31a - arc-shaped protrusion; 31b - rectangular arc-shaped slot hole; 31c - upper connection hole; 31d - first round hole; 31e - second round hole; 31f - lower connection hole; 32a - outer swirl fins; 33a - inner swirl fins; 33b - connection hole; 34a - crushing hole; 34b - flange; 34c - flange connection hole. Detailed implementation manners

[0035] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by orientation words such as "inside, outside", "above, below", "left, right", etc. is usually based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description. Without contrary description, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the protection scope of the present invention.

[0036] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0037] Embodiment 1 As Figures 1-3 shown, a split-structure urea mixing device includes an intake mixing chamber 1, an outlet mixing chamber 2 and an integrated atomization chamber 3; As Figure 4 and 5 shown, the intake mixing chamber 1 includes an annular cylinder 11. Round holes 110 and flanged round holes 111 are respectively arranged on the upper and lower surfaces of the annular cylinder 11. The round holes 110 are used to install the urea injection base 12. Circular end caps 14 and annular end caps 13 are respectively arranged at both ends of the annular cylinder 11; As Figure 6 and 7 shown, the outlet mixing chamber 2 includes a circular cylinder 21 and a circular boss end cap 23. After the circular cylinder 21 and the circular boss end cap 23 are assembled and connected, an integral flanged hole 24 is formed at the upper end; AsFigure 9 and 10 As shown in 10 , the integrated atomization chamber 3 includes a hole tube 31, and an upper swirl tube 32 and a lower swirl tube 33 located inside the hole tube 31. Outer swirl fins 32a are circumferentially and uniformly arranged on the upper swirl tube 32, and inner swirl fins 33a are circumferentially and uniformly arranged on the lower swirl tube 33; The upper end of the hole tube 31 penetrates into the intake mixing chamber 1 through the flanged round hole 111 and is fixedly connected to the annular cylinder 11; the lower end of the hole tube 31 penetrates into the overall flanged hole 24, and the hole tube 31 is fixedly connected to the overall flanged hole 24; A circular crushing plate 34 is arranged at the lower end of the hole tube 31, and there is a gap with a height h1 of 10 mm between the circular crushing plate 34 and the lower end of the hole tube 31.

[0038] First arc-shaped slot holes 11a are symmetrically arranged on the outer periphery of the round hole 110, and an arc-shaped protrusion 31a is arranged at the upper end of the hole tube 31. The arc-shaped protrusion 31a can be inserted into the first arc-shaped slot holes 11a to realize the connection between the hole tube 31 and the upper surface of the annular cylinder 11.

[0039] Second arc-shaped slot holes 23a are symmetrically arranged on the circular convex platform end cover 23, and spoiler arc plates 22 are symmetrically attached to the inside of the circular cylinder 21. The spoiler arc plates 22 are fixedly connected to the circular convex platform end cover 23 through the cooperation of their arc-shaped slots 22b and the second arc-shaped slot holes 23a.

[0040] There is an intermediate gap 221 between the two spoiler arc plates 22 in the lower half circle of the circular cylinder 21. The angle Ɛ of the intermediate gap 221 is 40°, the central angle θ of the spoiler arc plate 22 is 90°, and the radius R of the arc surface 22a of the spoiler arc plate 22 is 90 mm, as Figure 8 shown.

[0041] As Figures 13-15 shown, both the upper swirl tube 32 and the lower swirl tube 33 are frustum-shaped. The cone angle β of the upper swirl tube 32 is 18°, and the cone angle γ of the lower swirl tube 33 is 18°. The size of the upper end of the upper swirl tube 32 is larger than that of its lower end, and the size of the lower end of the lower swirl tube 33 is larger than that of its upper end. The lower end of the upper swirl tube 32 is inserted into the upper end of the lower swirl tube 33, and the upper swirl tube 32 and the lower swirl tube 33 are spot-welded at the connection hole 33b. Three φ5 mm connection holes 33b are uniformly arranged at the upper end of the lower swirl tube 33.

[0042] As Figure 11 shown, a number of φ10 mm first round holes 31d are circumferentially and uniformly arranged on the upper half of the hole tube 31. The total area of the first round holes 31d occupies 2 / 3 of the area of the upper half of the hole tube 31. A number of φ10 mm second round holes 31e are circumferentially and uniformly arranged on the lower half of the hole tube 31. The total area of the second round holes 31e occupies 1 / 3 of the area of the lower half of the hole tube 31.

[0043] On the upper part of the orifice tube 31, rectangular arc groove holes 31b are symmetrically arranged. There are 6 upper connecting holes 31c with a diameter of φ5mm between the rectangular arc groove holes 31b and the first round hole 31d. The upper end of the upper swirl tube 32 is spot-welded to the orifice tube 31 at the upper connecting holes 31c. The circumferential angle α of the rectangular arc groove holes 31b is 88°, and the height h is 30mm, as Figure 12 shown.

[0044] As Figure 16 and 17 shown, a number of φ5mm crushing holes 34a are evenly arranged on the circular crushing plate 34. Three flanges 34b are evenly arranged in the circumferential direction of the plane of the circular crushing plate 34. Flange connecting holes 34c are arranged on the flanges 34b. There are 6 lower connecting holes 31f with a diameter of φ5mm below the second round hole 31e. The circular crushing plate 34, the orifice tube 31 and the lower swirl tube 33 are spot-welded at the flange connecting holes 34c and the lower connecting holes 31f.

[0045] As Figure 18 shown, the intake mixing chamber 1 is connected to the DPF module through the flange of the circular end cover 14. The outlet mixing chamber 2 is connected to the end face of the SCR carrier through the flange of the circular cylinder 21. The upper and lower ends of the integrated atomization chamber 3 are respectively located in the intake mixing chamber 1 and the outlet mixing chamber 2. The gas at the rear end of the DPF module enters the intake mixing chamber 1 in the horizontal direction, changes direction in the integrated atomization chamber 3 and then flows out horizontally from the outlet mixing chamber 2.

[0046] During specific use, the flanging of the circular end cover 14 is connected to the DPF module through a hoop. After the gas at the rear end of the DPF module flows into the intake mixing chamber 1, the gas flows in through the two rectangular arc-shaped holes 31b and the first round hole 31d at the upper end of the integrated atomization chamber 3. When a urea nozzle is installed on the urea injection base 12, the urea aqueous solution is sprayed upward in the direction of the upward swirl tube 32, and the gas and the urea aqueous solution undergo the first atomization and fragmentation during the external swirl and turbulence outside the upward swirl tube 32. The gas in the space between the inner wall of the hole tube 31 and the outer walls of the upward swirl tube 32 and the downward swirl tube 33 continues to flow downward. A small-diameter tube is formed between the upward swirl tube 32 and the downward swirl tube 33, which further quickly pushes the gas and the urea aqueous solution to undergo internal swirl and turbulence in the downward swirl tube 33 for the second atomization and fragmentation. The fragmentation holes 34a uniformly distributed on the circular fragmentation plate 34 at the bottom of the integrated atomization chamber 3 further fragment and disrupt the mixture of urea and gas after the second atomization and fragmentation, preventing urea crystallization at the bottom of the outlet mixing chamber 2. The gas after atomization and fragmentation flows out through the second round hole 31e at the lower end of the integrated atomization chamber 3 and the gap between the circular fragmentation plate 34 and the bottom surface of the hole tube 31. Part of the air flow flows to the arc surface 22a on the surface of the turbulence arc plate 22, and the gas will deflect towards the end face direction of the SCR carrier. Part of the air flow enters from the back of the turbulence arc plate 22 and then flows out through the gap between the two turbulence arc plates 22, which secondly prevents urea crystallization at the bottom of the outlet mixing chamber 2. At this time, the gas in the outlet mixing chamber 2 uniformly flows towards the end face direction of the SCR carrier, providing sufficient reducing agent for the subsequent SCR. Under the action of the catalyst carrier, ammonia reacts with nitrogen oxides (NOx) in the tail gas in the SCR post-treatment to achieve the purpose of eliminating harmful nitrogen oxide emissions (NOx) from diesel engines.

[0047] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and are not restrictive. Although the present invention has been described in detail with reference to the examples, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A split structure urea mixing device, characterized in that: It comprises an air inlet mixing chamber (1), an air outlet mixing chamber (2) and an integrated atomization chamber (3); The air intake mixing chamber (1) comprises an annular cylinder (11), the upper and lower surfaces of the annular cylinder (11) are respectively provided with a circular hole (110) and a flanged circular hole (111), the circular hole (110) is used to install a urea injection base (12), and the two ends of the annular cylinder (11) are respectively provided with a circular end cover (14) and an annular end cover (13); The gas outlet mixing chamber (2) comprises a circular cylinder (21) and a circular boss end cover (23); after the circular cylinder (21) and the circular boss end cover (23) are assembled and connected, an integral flange hole (24) is formed at the upper end; The integrated atomization chamber (3) comprises a perforated tube (31), and an upper swirl tube (32) and a lower swirl tube (33) located inside the perforated tube (31), the upper swirl tube (32) being evenly provided with outer swirl fins (32a) in a circumferential direction, and the lower swirl tube (33) being evenly provided with inner swirl fins (33a) in a circumferential direction; The upper end of the orifice tube (31) penetrates into the air intake mixing chamber (1) through the flanged circular hole (111) and is fixedly connected to the annular cylinder (11); the lower end of the orifice tube (31) penetrates into the integral flanged hole (24), and the orifice tube (31) is fixedly connected to the integral flanged hole (24); A circular crushing plate (34) is provided at the lower end of the orifice tube (31), and a gap of height h1 exists between the circular crushing plate (34) and the lower end of the orifice tube (31).

2. The split structure urea mixing device according to claim 1, characterized in that: The outer circumference of the circular hole (110) is symmetrically provided with a first arc-shaped slot hole (11a), and the upper end of the hole tube (31) is provided with an arc-shaped protrusion (31a), and the arc-shaped protrusion (31a) can be inserted into the first arc-shaped slot hole (11a), so as to realize the connection between the hole tube (31) and the upper surface of the annular cylinder (11).

3. The split structure urea mixing device according to claim 1, characterized in that: The circular boss end cover (23) is symmetrically provided with a second arc-shaped slot hole (23a); A spoiler arc plate (22) is symmetrically arranged inside the circular cylinder (21), the lower end of the spoiler arc plate (22) is attached to the circular cylinder (21), and the arc-shaped groove (22b) arranged at the upper end of the spoiler arc plate (22) can be inserted into the second arc-shaped groove hole (23a), thereby achieving a fixed connection between the spoiler arc plate (22) and the circular boss end cover (23).

4. The split structure urea mixing device according to claim 1, characterized in that: The upper vortex tube (32) and the lower vortex tube (33) are both truncated cone-shaped; the size of the upper end of the upper vortex tube (32) is larger than the size of the lower end; the size of the lower end of the lower vortex tube (33) is larger than the size of the upper end; the lower end of the upper vortex tube (32) is inserted into the upper end of the lower vortex tube (33); the upper vortex tube (32) and the lower vortex tube (33) are fixedly connected at a connecting hole (33b); and the connecting hole (33b) is provided at the upper end of the lower vortex tube (33).

5. The split structure urea mixing device according to claim 1, characterized in that: The upper half of the orifice tube (31) has a plurality of first circular holes (31d) evenly distributed in the circumference, and the total area of ​​the first circular holes (31d) occupies 2 / 3 of the area of ​​the upper half of the orifice tube (31); the lower half of the orifice tube (31) has a plurality of second circular holes (31e) evenly distributed in the circumference, and the total area of ​​the second circular holes (31e) occupies 1 / 3 of the area of ​​the lower half of the orifice tube (31).

6. The split structure urea mixing device according to claim 1, characterized in that: The upper part of the orifice tube (31) is symmetrically provided with rectangular arc slot holes (31b), an upper connecting hole (31c) is provided between the rectangular arc slot hole (31b) and the first circular hole (31d), and the upper end of the upper swirl tube (32) is fixedly connected to the orifice tube (31) at the upper connecting hole (31c); The circular crushing plate (34) is evenly provided with crushing holes (34a), the circular crushing plate (34) is provided with a plurality of flanges (34b) in the circumferential direction, the flange (34b) is provided with a flange connection hole (34c), a lower connection hole (31f) is provided below the second circular hole (31e), the lower connection hole (31f) is provided corresponding to the flange connection hole (34c), and the circular crushing plate (34), the orifice tube (31) and the lower vortex tube (33) are fixedly connected at the flange connection hole (34c) and the lower connection hole (31f).

7. The split structure urea mixing device according to claim 3, characterized in that: The two spoiler arc plates (22) have a middle notch (221) between the lower semicircle of the circular cylinder (21); the angle Ɛ of the middle notch (221) is 30°-50°; the center angle θ of the spoiler arc plate (22) is 90°-100°; and the radius R of the arc surface (22a) of the spoiler arc plate (22) is 80-100 mm.

8. The split structure urea mixing device according to claim 6, characterized in that: The central angle α of the rectangular arc slot (31b) is 80°-90°, and the height h is 30-50 mm; The cone angle β of the upper cyclone (32) is 15°-20°, and the cone angle γ of the lower cyclone (33) is 15°-20°.

9. The split structure urea mixing device according to claim 1, characterized in that: The inlet mixing chamber (1) is connected to the DPF module via the flange of the circular end cover (14); the outlet mixing chamber (2) is connected to the end surface of the SCR carrier via the flange of the circular cylinder (21); the upper and lower ends of the integrated atomization chamber (3) are respectively located in the inlet mixing chamber (1) and the outlet mixing chamber (2); the gas at the rear end of the DPF module enters the inlet mixing chamber (1) in a horizontal direction, and flows out of the outlet mixing chamber (2) in a horizontal direction after changing direction in the integrated atomization chamber (3).

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