Cylinder type mixer and post-processing system

Abstract

The utility model provides a barrel type mixer which comprises a barrel type shell, a first partition plate with an air inlet is installed at the first end of the barrel type shell, a second partition plate with an air outlet is installed at the second end of the barrel type shell, a first opening is formed in the barrel wall of the barrel type shell and used for installing a nozzle, and a second opening is formed in the barrel wall of the barrel type shell and used for installing a nozzle. A flow guide baffle, a rotational flow pipe and a third partition plate are arranged in an inner cavity of the cylindrical shell, and the flow guide baffle surrounds the upper pipe body and is arranged on the third partition plate, so that a first cavity is formed among the first partition plate, the cylindrical wall of the cylindrical shell, the flow guide baffle and the third partition plate; a second cavity is formed among the first partition plate, the barrel wall of the barrel type shell, the third partition plate, the flow guide baffle and the second partition plate. The utility model further provides a corresponding post-processing system. Through the cylindrical rotational flow design, the device can be applied to a national sixth SCR system, and is low in back pressure, good in mixing effect and excellent in anti-crystallization performance.

Description

Technical Field

[0001] This utility model belongs to the field of exhaust gas treatment technology, specifically relating to a cylindrical mixer and a post-treatment system. Background Technology

[0002] As domestic diesel vehicle emission regulations continue to be upgraded, stricter requirements are being placed on vehicle exhaust after-treatment systems and their core component, the mixer. As a key component of the after-treatment system, the performance of the mixer directly affects NOx emissions.

[0003] The mixer needs to ensure thorough mixing of exhaust gas and the reducing agent (such as urea solution) to improve the conversion efficiency of the SCR system. The mixer also needs good heat exchange performance to ensure that the urea solution rapidly vaporizes and mixes thoroughly with the exhaust gas during injection, which helps improve the conversion efficiency of the SCR system and reduce urea consumption. Because the "China VI" emission standard imposes stricter emission limits under low-temperature and low-load conditions, and the injection volume is increased, the risk of crystallization in the mixer increases. Excessive crystal formation can clog the aftertreatment channels, leading to increased back pressure in the aftertreatment system, insufficient vehicle power, and the risk of emissions exceeding regulatory limits. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a cylindrical mixer and post-processing system with low back pressure, good mixing effect, and excellent anti-crystallization performance.

[0005] To solve the above-mentioned technical problems, the first aspect of this utility model provides a cylindrical mixer, characterized in that it includes a cylindrical shell having a first end and a second end opposite to the first end; a first baffle with an air inlet is installed at the first end of the cylindrical shell; a second baffle with an air outlet is installed at the second end of the cylindrical shell; a first opening is provided in the cylindrical wall of the cylindrical shell for installing a nozzle; a guide baffle, a swirling tube, and a third baffle are provided inside the inner cavity of the cylindrical shell; the third baffle has a second opening; the swirling tube passes through the second opening and is installed on the third baffle; the third baffle divides the swirling tube into an upper tube and a lower tube, and the upper opening of the upper tube corresponds to the... The first opening is provided, and both the upper and lower pipe walls are provided with openings. The flow guide baffle is arranged around the upper pipe on the third partition, so that a first cavity is formed between the first partition, the cylindrical wall of the cylindrical shell, the flow guide baffle, and the third partition. The air inlet of the first partition is the inlet for gas to flow into the first cavity, and the opening of the upper pipe is the outlet for gas to flow out of the first cavity. A second cavity is formed between the first partition, the cylindrical wall of the cylindrical shell, the third partition, the flow guide baffle, and the second partition. The opening of the lower pipe and the lower pipe opening are the inlets for gas to flow into the second cavity, and the air outlet of the second partition is the outlet for gas to flow out of the second cavity.

[0006] Preferably, a flow guide plate is provided inside the inner cavity of the cylindrical shell, and the flow guide plate is provided corresponding to the lower pipe opening of the lower pipe body.

[0007] Preferably, there is an outlet gap between the lower pipe opening of the lower pipe body and the guide arc plate for gas to flow out.

[0008] Preferably, the air inlet is located on the upper side of the first partition, such that the gas entering from the air inlet swirls around one side of the swirling tube to the outlet of the first cavity.

[0009] Preferably, the first baffle is provided with an arc-shaped protrusion extending along the axial direction of the cyclone tube. The arc-shaped protrusion is away from the cyclone tube protrusion and matches the tube wall of the cyclone tube, so that there is an arc-shaped gap between the arc-shaped protrusion and the tube wall of the cyclone tube to form a vortex.

[0010] Preferably, the air outlet is located in the central region of the second partition.

[0011] Preferably, the flow guide baffle is arc-shaped, and the flow guide baffle is provided with several arc-shaped flow guide grooves.

[0012] Preferably, the opening in the upper tube body includes a first opening and a second opening, the first opening being located above the second opening, the first opening being disposed on the upper part of the upper tube body, and a blade being disposed in part of the second opening.

[0013] Preferably, the longitudinal axis of the cyclone tube is at a preset angle to the longitudinal axis of the cylindrical shell, and the preset angle is 60° to 120°.

[0014] The second aspect of this utility model provides a post-treatment system, characterized in that it includes the aforementioned cylindrical mixer, the first end of which is sequentially connected to a DPF and a DOC, the second end of which is connected to an SCR or an ASC, the DOC being provided with a gas inlet, the SCR or ASC being provided with a gas outlet, and the longitudinal axis of the cylindrical mixer coinciding with the longitudinal axis of the post-treatment system.

[0015] The cylindrical mixer and post-processing system of this invention, through the cylindrical swirl design, can be applied to the China VI SCR system, with low back pressure, good mixing effect and excellent anti-crystallization performance. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the post-processing system of this utility model.

[0017] Figure 2 This is an exploded view of the cylindrical mixer of this utility model.

[0018] Figure 3 This is a first-view schematic diagram illustrating the working principle of the cylindrical mixer of this utility model.

[0019] Figure 4 This is a second-view schematic diagram illustrating the working principle of the cylindrical mixer of this utility model.

[0020] Figure 5 This is a third-person perspective schematic diagram illustrating the working principle of the cylindrical mixer of this utility model.

[0021] Figure 6 This is a schematic diagram of the structure of the cylindrical mixer of this utility model. Detailed Implementation

[0022] To make the technical problem solved by this utility model clearer, the present utility model is further described below with reference to embodiments and accompanying drawings. The specific embodiments described herein are only for explaining the present utility model and are not intended to limit the present utility model.

[0023] like Figure 1The diagram shown is a schematic representation of the aftertreatment system of this invention. The aftertreatment system includes a cylindrical mixer 14. The first end of the cylindrical mixer 14 is sequentially connected to a DPF 12 and a DOC 11. The second end of the cylindrical mixer is connected to an SCR 16 or an ASC. The DOC 11 is connected to an intake assembly 10 to provide a gas inlet, and the SCR 16 is connected to an outlet assembly 17 to provide a gas outlet. The longitudinal axis of the cylindrical mixer 14 coincides with the longitudinal axis of the aftertreatment system; that is, the entire aftertreatment system is a straight cylindrical type.

[0024] DPF 12, DOC 11, cylindrical mixer 14, and SCR 16 can be connected via flanges, clamps 13, welding, etc., to form a straight cylindrical internal cavity. Specifically, the DPF can be designed to be detachable. The DOC (Diesel Oxidation Catalyst) is a diesel engine oxidation catalyst, the DPF (Diesel Particulate Filter) is a diesel particulate filter, the SCR (Selective Catalytic Reduction) is a selective catalytic reduction catalyst, and the ASC (Ammonia Slip Catalyst) is an ammonia oxidation catalyst. All components—DOC, DPF, SCR, and ASC—contain catalyst supports.

[0025] like Figure 1 As shown, the exhaust gas enters the aftertreatment system through the intake assembly 10, and then passes through DOC 11, DPF 12, and enters the cylindrical mixer 14 in sequence. It is mixed with the reducing agent sprayed by the nozzle 15 inside the cylindrical mixer 14, and then enters the SCR 16 for catalytic reduction reaction. Finally, the exhaust gas that meets the requirements is discharged through the exhaust assembly 17.

[0026] like Figures 2 to 6 The diagram illustrates an embodiment of the cylindrical mixer of this invention, which reduces system back pressure, decreases urea crystallization, and improves the mixing efficiency of urea and waste gas, as well as the De-NOx conversion efficiency. The cylindrical mixer comprises a cylindrical shell 5 having a first end and a second end opposite to the first end. A first baffle 1 with an air inlet 101 is installed at the first end of the cylindrical shell 5, and a second baffle 8 with an air outlet 801 is installed at the second end of the cylindrical shell 5. A first opening 501 is provided in the cylindrical wall of the cylindrical shell 5 for mounting a nozzle 15, which can be mounted through the first opening 501 by a mounting base 7.

[0027] The cylindrical shell 5 has a flow guide baffle 4, a swirling tube, and a third baffle 6 inside its inner cavity. The third baffle 6 has a second opening 601. The swirling tube passes through the second opening 601 and is installed on the third baffle 6, dividing the swirling tube into an upper tube body 2 and a lower tube body 3. The upper opening of the upper tube body 2 corresponds to the first opening 501. Both the tube walls of the upper tube body 2 and the lower tube body 3 have openings, such as... Figure 5 As shown, the flow guide baffle 4 is arranged around the upper pipe body 2 on the third partition 6, forming a first cavity 1401 between the first partition 1, the cylindrical wall of the cylindrical shell 5, the flow guide baffle 4, and the third partition 6. The air inlet 101 of the first partition 1 is the inlet for gas to flow into the first cavity 1401, and the opening of the upper pipe body 2 is the outlet for gas to flow out of the first cavity 1401. Figure 2 and Figure 5 As shown, the guide baffle 4 is arc-shaped, and the guide baffle 4 is provided with several arc-shaped guide grooves 401 to facilitate the guidance of swirling gas. The interior of the swirling tube and the nozzle seat form a third cavity 1402. The exhaust gas swirling in the first cavity enters the third cavity through the opening in the tube wall of the upper tube and mixes with the reducing agent sprayed by the nozzle in the third cavity.

[0028] like Figure 6 As shown, a second cavity 1403 is formed between the first partition 1, the cylindrical wall of the cylindrical shell 5, the third partition 6, the guide baffle 4, and the second partition 8. The opening and lower pipe port of the lower pipe 3 are the inlets for gas to flow into the second cavity 1403, and the outlet 801 of the second partition 8 is the outlet for gas to flow out of the second cavity 1403. The gas mixed in the third cavity enters the second cavity through the lower pipe port and the side wall opening of the lower pipe, undergoes further mixing in the second cavity, and flows out through the outlet.

[0029] like Figure 2 As shown, a flow guide plate 9 is provided inside the inner cavity of the cylindrical shell 5, and the flow guide plate 9 is provided corresponding to the lower pipe opening of the lower pipe body 3. An outlet gap is provided between the lower pipe opening of the lower pipe body 3 and the flow guide plate 9 for gas to flow out.

[0030] like Figure 2 , Figure 3 and Figure 5 As shown, the air inlet 101 is located on the upper side of the first partition 1, so that the gas entering from the air inlet 101 swirls around one side of the swirling tube and flows to the outlet of the first cavity 1401. Based on the side opening on the first partition, which facilitates the formation of a swirling flow, this invention does not limit the shape of the air inlet.

[0031] like Figure 2 and Figure 5 As shown, the first partition 1 is provided with an arc-shaped protrusion 102 extending along the axial direction of the cyclone tube. The arc-shaped protrusion 102 is away from the cyclone tube protrusion and matches the tube wall of the cyclone tube, so that there is an arc-shaped gap between the arc-shaped protrusion 102 and the tube wall of the cyclone tube, making the first cavity an annular cavity for forming swirl.

[0032] like Figure 2 and Figure 6 As shown, the air outlet 801 is located in the central region of the second partition 8. In addition to the air outlet, other openings may also be provided on the second partition.

[0033] like Figure 2 As shown, the upper tube 2 has openings including a first opening 201 and a second opening. The first opening 201 is located above the second opening and is disposed on the upper part of the upper tube 2. A blade is disposed in part of the second opening. The blade can face inward or outward.

[0034] The longitudinal axis of the cyclone tube forms a predetermined angle with the longitudinal axis of the cylindrical shell, the predetermined angle being 60° to 120°, preferably around 90°. The cyclone tube can be a circular tube, an elliptical tube, or other similar shapes.

[0035] The cylindrical mixer and post-processing system of this invention, through the cylindrical swirl design, can be applied to the China VI SCR system, with low back pressure, good mixing effect and excellent anti-crystallization performance.

[0036] The above descriptions are specific embodiments of this utility model and do not constitute a limitation on the scope of protection of this utility model. Any modifications and variations made to the technical concept of this utility model should be included within the scope of protection of this utility model.

Claims

1. A cylindrical mixer, characterized in that, The device includes a cylindrical shell having a first end and a second end opposite to the first end. A first baffle with an air inlet is installed at the first end of the cylindrical shell, and a second baffle with an air outlet is installed at the second end of the cylindrical shell. A first opening is provided in the cylindrical wall of the cylindrical shell for mounting a nozzle. A flow guide baffle, a swirling tube, and a third baffle are provided inside the cylindrical shell. The third baffle has a second opening, and the swirling tube passes through the second opening and is mounted on the third baffle. The third baffle divides the swirling tube into an upper tube and a lower tube. The upper opening of the upper tube corresponds to the first opening. The wall of the upper tube and... The lower tube body has openings in its walls. The flow guide baffles are arranged around the upper tube body on the third partition, forming a first cavity between the first partition, the cylindrical wall of the cylindrical shell, the flow guide baffles, and the third partition. The air inlet of the first partition is the inlet for gas to flow into the first cavity, and the openings of the upper tube body are the outlets for gas to flow out of the first cavity. A second cavity is formed between the first partition, the cylindrical wall of the cylindrical shell, the third partition, the flow guide baffles, and the second partition. The openings of the lower tube body and the lower tube opening are the inlets for gas to flow into the second cavity, and the air outlet of the second partition is the outlet for gas to flow out of the second cavity.

2. The cylindrical mixer according to claim 1, characterized in that, A flow guide plate is provided inside the inner cavity of the cylindrical shell, and the flow guide plate is provided corresponding to the lower pipe opening of the lower pipe body.

3. The cylindrical mixer according to claim 2, characterized in that, The lower pipe body has an outlet gap between its lower pipe opening and the guide arc plate for gas to flow out.

4. The cylindrical mixer according to claim 1, characterized in that, The air inlet is located on the upper side of the first partition, so that the gas entering from the air inlet swirls around one side of the swirling tube to the outlet of the first cavity.

5. The cylindrical mixer according to claim 1, characterized in that, The first baffle plate is provided with an arc-shaped protrusion extending along the axial direction of the cyclone tube. The arc-shaped protrusion is away from the cyclone tube protrusion and matches the tube wall of the cyclone tube, so that there is an arc-shaped gap between the arc-shaped protrusion and the tube wall of the cyclone tube to form a cyclone.

6. The cylindrical mixer according to claim 1, characterized in that, The air outlet is located in the central area of ​​the second partition.

7. The cylindrical mixer according to claim 1, characterized in that, The flow guide baffle is arc-shaped and has several arc-shaped flow guide grooves.

8. The cylindrical mixer according to claim 1, characterized in that, The opening in the upper tube body includes a first opening and a second opening. The first opening is located above the second opening and is located on the upper part of the upper tube body. A blade is partially installed in the second opening.

9. The cylindrical mixer according to claim 1, characterized in that, The longitudinal axis of the cyclone tube is at a preset angle to the longitudinal axis of the cylindrical shell, and the preset angle is 60° to 120°.

10. A post-processing system, characterized in that, The device includes a cylindrical mixer as described in any one of claims 1 to 9, wherein a first end of the cylindrical mixer is connected in sequence to a DPF and a DOC, a second end of the cylindrical mixer is connected to an SCR or an ASC, the DOC is provided with a gas inlet, the SCR or ASC is provided with a gas outlet, and the longitudinal axis of the cylindrical mixer coincides with the longitudinal axis of the post-treatment system.

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