A high efficiency mixing pipeline device

Abstract

The present invention discloses a high-efficiency mixing pipeline device, including a drainage mixing pipe, the outer periphery of the drainage mixing pipe is matched and connected with an insulation pipe, the two ends of the insulation pipe are respectively an air inlet end and an air outlet end, the inner wall of the air inlet end is connected with a grid-shaped mixer, and the inner wall of the air outlet end is connected with a wire mesh mixer; the outer wall of the air inlet end is matched and connected with an air inlet end cover module, the side of the air inlet end cover module away from the grid-shaped mixer is connected with a urea nozzle base, the urea nozzle base is connected with a urea nozzle, and the urea nozzle is connected with the inside of the air inlet end cover module through the urea nozzle base; the outer wall of the air outlet end is matched and connected with an air outlet end cover module; the air inlet end cover module and the air outlet end cover module are both perpendicular to the axis of the insulation pipe. The high-efficiency mixing pipeline device provided by the present invention can achieve rapid and sufficient mixing of urea and exhaust gas in sufficient space, reduce the difficulty of manufacturability, and greatly improve the competitiveness of the product.

Description

Technical Field

[0001] The invention belongs to the technical field of diesel engine exhaust treatment equipment, and in particular relates to a high-efficiency mixing pipeline device. Background Art

[0002] With the development of diesel engine technology, the layout space of vehicle National VI and non-road T4 after-processors is very compact, and the urea mixing device needs to quickly solve the problem of sufficient mixing of urea and exhaust gas within sufficient space.

[0003] At present, vehicle manufacturers place the post-processor in a compressed space design on the urea mixing device, but it is difficult to achieve a urea mixing device that can fully mix the urea and set up a complex mixing structure in a limited space.

[0004] Therefore, researching and developing an efficient mixing pipeline device that can achieve rapid and sufficient mixing of urea and exhaust gas in a sufficient space and reduce the difficulty of manufacturability has become a major issue that needs to be solved in this field. Summary of the invention

[0005] Purpose of the invention: In order to overcome the deficiencies in the prior art, the present invention provides a high-efficiency mixing pipeline device. The technical problem to be solved is how to achieve rapid and sufficient mixing of urea and exhaust gas in a sufficient space and reduce the difficulty of manufacturability.

[0006] Technical solution: To achieve the above purpose, the technical solution adopted by the present invention is:

[0007] One object of the present invention is to provide a high-efficiency mixing pipeline device, including a drainage mixing tube, the outer periphery of the drainage mixing tube is matched and connected with an insulation tube, the two ends of the insulation tube are respectively an air inlet end and an air outlet end, the inner wall of the air inlet end is connected with a grid-shaped mixer, and the inner wall of the air outlet end is connected with a wire mesh mixer; the outer wall of the air inlet end is matched and connected with an air inlet end cover module, the side of the air inlet end cover module away from the grid-shaped mixer is connected with a urea nozzle base, the urea nozzle base and the grid-shaped mixer are matched and correspondingly arranged, the urea nozzle base is connected with a urea nozzle, and the urea nozzle is connected to the inside of the air inlet end cover module through the urea nozzle base; the outer wall of the air outlet end is matched and connected with an air outlet end cover module; the air inlet end cover module and the air outlet end cover module are both perpendicular to the axis of the insulation tube.

[0008] Optionally, the air inlet end cover module and the air outlet end cover module are both hollow shells, and the air inlet end cover module and the air outlet end cover module have an air inlet and an air outlet on one side close to the insulation tube, respectively, and the air inlet and the air outlet are connected to the interior of the drainage mixing tube.

[0009] Optionally, the internal angle α between the first reference line of the air inlet and the second reference line of the air outlet is 40° to 60°; the first reference line is a perpendicular line from the center of the air inlet to the central axis of the insulation tube, and the second reference line is a perpendicular line from the center of the air outlet to the central axis of the insulation tube.

[0010] Optionally, the outer wall of the air intake end cover module includes a first outer wall and a second outer wall, and a first high-temperature resistant glass fiber wool is provided between the first outer wall and the second outer wall; the outer wall of the air outlet end cover module includes a third outer wall and a fourth outer wall, and a second high-temperature resistant glass fiber wool is provided between the third outer wall and the fourth outer wall; and a third high-temperature resistant glass fiber wool is provided between the drainage mixing tube and the insulation tube.

[0011] Optionally, the heat-resistant temperature of the first high-temperature resistant glass fiber wool, the second high-temperature resistant glass fiber wool and the third high-temperature resistant glass fiber wool is 650-850°C.

[0012] Optionally, the drainage mixing tube has a first arc at one end close to the wire mesh mixer and a second arc at the other end, and both the first arc and the second arc extend toward the inner wall of the insulation tube, and the outer walls at both ends of the drainage mixing tube fit tightly against the inner wall of the insulation tube.

[0013] Optionally, the radius ratio of the first arc to the second arc is 1 / 6 to 1 / 4.

[0014] Optionally, the ratio of the diameter D of the drainage mixing tube to its length L is 1 / 6 to 1 / 8.

[0015] Optionally, the grid-like mixer includes a plurality of vertically crossed grid pieces, the grid pieces face the grid-like mixer on a side close to the wire mesh mixer; and the wire mesh mixer includes mutually interwoven wire meshes.

[0016] Another object of the present invention is to provide a method for operating an efficient mixing pipeline device, comprising the following steps:

[0017] Step 1: exhaust gas enters from the air inlet of the air inlet end cover module and flows into the interior of the drainage mixing tube. When the internal temperature of the high-efficiency mixing pipeline device reaches 200° C., the urea nozzle discharges a columnar urea aqueous solution to the grid-shaped mixer at a fixed pressure, and the exhaust gas and urea are quickly atomized once by the grid-shaped mixer.

[0018] Step 2, the mixed gas after the primary atomization flows into the drainage mixing tube, passes through the drainage mixing tube, and reaches the wire mesh mixer for secondary atomization;

[0019] Step three, the ammonia gas obtained after the secondary atomization is uniformly provided to the subsequent process through the gas outlet of the gas outlet end cover module.

[0020] Beneficial effects: Compared with the prior art, the present invention provides a high-efficiency mixing pipeline device, which can achieve rapid and sufficient mixing of urea and exhaust gas in a sufficient space, reduce the difficulty of manufacturability, greatly improve product competitiveness, and has a simple structure and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0022] Figure 1 A three-dimensional exploded view of a high-efficiency mixing pipeline device provided by the present invention;

[0023] Figure 2 A main cross-sectional view of a high-efficiency mixing pipeline device provided by the present invention;

[0024] Figure 3 A right side view of a high-efficiency mixing pipeline device provided by the present invention;

[0025] Figure 4 A partial view of a drainage mixing tube of a high-efficiency mixing pipeline device provided by the present invention;

[0026] Figure 5 A front view of a mixing pipeline portion of a high-efficiency mixing pipeline device provided by the present invention;

[0027] Figure 6 A partial view of a wire mesh mixer of a high-efficiency mixing pipeline device provided by the present invention;

[0028] Figure 7 A partial view of a grid-shaped mixer of a high-efficiency mixing pipeline device provided by the present invention;

[0029] Figure 8 A schematic diagram of the working principle of a high-efficiency mixing pipeline device provided by the present invention;

[0030] In the figure: 1. air inlet cover module; 101. first high temperature resistant glass fiber wool; 2. urea nozzle; 3. urea nozzle base; 4. grid-shaped mixer; 5. insulation pipe; 6. drainage mixing pipe; 601. third high temperature resistant glass fiber wool; 602. first arc; 603. second arc; 7. wire mesh mixer; 8. air outlet cover module; 801. second high temperature resistant glass fiber wool. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0033] like Figure 1 , Figure 6 and Figure 7 The figure shows a high-efficiency mixing pipeline device, including a drainage mixing tube 6, the outer periphery of which is matched with an insulation tube 5, the two ends of the insulation tube 5 are respectively an air inlet end and an air outlet end, the inner wall of the air inlet end is connected with a grid-shaped mixer 4, and the inner wall of the air outlet end is connected with a wire mesh mixer 7; the outer wall of the air inlet end is matched with an air inlet end cover module 1, and optionally, the connection method between the outer wall of the air inlet end and the air inlet end cover module 1 includes but is not limited to welding, riveting and gluing; the side of the air inlet end cover module 1 away from the grid-shaped mixer 4 is connected with a urea nozzle base 3, and optionally, the connection method between the air inlet end cover module 1 and the urea nozzle base 3 includes but is not limited to welding, riveting and gluing one of them; the urea nozzle base 3 is coaxially arranged with the grid-shaped mixer 4, and the urea nozzle base 3 is connected with the urea nozzle 2. Optionally, the connection method between the urea nozzle base 3 and the urea nozzle 2 includes but is not limited to welding, riveting, gluing and bolting; the urea nozzle 2 is connected with the interior of the air intake cover module 1 through the urea nozzle base 3, and the grid-shaped mixer 4 is within the range of the urea nozzle 2; the outer wall of the air outlet is matched and connected with the air outlet cover module 8. Optionally, the connection method between the outer wall of the air outlet and the air outlet cover module 8 includes but is not limited to welding, riveting and gluing; the air intake cover module 1 and the air outlet cover module 8 are both perpendicular to the axis of the insulation pipe 5. In this example, Figure 8As shown, the exhaust gas enters from the air inlet of the intake end cover module 1 after passing through the DOC (diesel oxidation catalyst) and the DPF (diesel particulate filter), and flows into the interior of the drainage mixing tube 6. When the internal temperature of the high-efficiency mixing pipeline device reaches 200°C, the urea nozzle 2 discharges a columnar urea aqueous solution to the grid-shaped mixer 4 at a fixed pressure, and the exhaust gas and urea are quickly atomized once by the grid-shaped mixer 4; the mixed gas after the primary atomization flows into the drainage mixing tube 6. Due to the setting of the large diameter at both ends and the small diameter in the middle of the drainage mixing tube 6, the flow rate of the mixed gas is accelerated, and the mixed gas is impacted on the surface of the wire mesh mixer 7 and then atomized twice; the ammonia obtained after the secondary atomization is uniformly provided to the subsequent SCR (selective catalytic reduction) through the outlet of the outlet end cover module 8; the ammonia is atomized by the catalyst carrier in the SCR (selective catalytic reduction) The urea and exhaust gas are reacted in the post-processing of catalytic reduction to eliminate the harmful nitrogen oxides (NOx) emitted by diesel engines. The airflow direction from the air intake to the air outlet of the entire product is like an S shape. The high-efficiency mixing pipeline device provided by the present invention can achieve rapid and sufficient mixing of urea and exhaust gas in sufficient space, reduce the difficulty of manufacturability, greatly improve the competitiveness of the product, have a simple structure and strong practicality.

[0034] like Figure 1 and Figure 2 As shown, as an optional embodiment, the air inlet cover module 1 and the air outlet cover module 8 are both hollow shells, and the air inlet cover module 1 and the air outlet cover module 8 are respectively provided with an air inlet and an air outlet on one side close to the insulation tube 5, and the air inlet and the air outlet are connected to the inside of the drainage mixing tube 6. The exhaust gas enters from the air inlet of the air inlet cover module 1, flows into the inside of the drainage mixing tube 6, and after being atomized by the drainage mixing tube 6, it evenly provides ammonia for the subsequent process through the air outlet of the air outlet cover module 8.

[0035] like Figure 3 As shown, as an optional embodiment, the inner angle α between the first reference line of the air inlet and the second reference line of the air outlet is 40° to 60°; the first reference line is a perpendicular line from the center of the air inlet to the central axis of the insulation tube 5, and the second reference line is a perpendicular line from the center of the air outlet to the central axis of the insulation tube 5. In this example, α is 50°, which ensures that the overall size of the product is not too large and does not interfere with the installation connection with the previous and next processes; in another example, α is 40°, which slightly interferes with the installation connection with the previous and next processes; in another example, α is 60°, which is slightly larger than the overall size of the product.

[0036] like Figure 2 and Figure 5 As shown, as an optional embodiment, the outer wall of the air inlet cover module 1 includes a first outer wall and a second outer wall, and a first high-temperature resistant glass fiber wool 101 is provided between the first outer wall and the second outer wall; the outer wall of the air outlet cover module 8 includes a third outer wall and a fourth outer wall, and a second high-temperature resistant glass fiber wool 801 is provided between the third outer wall and the fourth outer wall; and a third high-temperature resistant glass fiber wool 601 is provided between the drainage mixing tube 6 and the insulation tube 5. Among them, the first high-temperature resistant glass fiber wool 101, the second high-temperature resistant glass fiber wool 801 and the third high-temperature resistant glass fiber wool 601 used in the embodiment of the present invention are all high-temperature resistant glass fiber wool, and the heat-resistant temperature of the high-temperature resistant glass fiber wool is 650-850°C. The high-temperature resistant glass fiber wool is a light-weight, durable, and high-temperature resistant heat-insulating material composed of uniform, slender, and elastic glass fibers and special high-temperature adhesives, which greatly improves the overall high-temperature resistance of the product.

[0037] like Figure 4 and Figure 5 As shown, as an optional embodiment, the drainage mixing tube 6 has a first arc 602 at one end close to the wire mesh mixer 7, and a second arc 603 at the other end. Both the first arc 602 and the second arc 603 extend toward the inner wall of the insulation tube 5, and the outer walls at both ends of the drainage mixing tube 6 are tightly fitted with the inner wall of the insulation tube 5. Optionally, the outer walls at both ends of the drainage mixing tube 6 and the inner wall of the insulation tube 5 are interference fit. In this example, the radius of the first arc 602 is 318mm, the radius of the second arc 603 is 1685mm, the diameter of the drainage mixing tube 6 is D=56mm, and the length of the drainage mixing tube 6 is L=388mm. Due to the large diameter at both ends of the drainage mixing tube 6 and the small diameter in the middle, the flow rate of the mixed gas is accelerated, which is conducive to secondary atomization after impacting the surface of the wire mesh mixer 7.

[0038] like Figure 7 As shown, as an optional embodiment, the grid mixer 4 includes a plurality of vertically crossed grid sheets, the grid sheets face the side of the grid mixer 4 close to the wire mesh mixer 7; the wire mesh mixer 7 includes interwoven wire meshes. The grid mixer 4 can be quickly atomized for the first time with the urea; the wire mesh mixer 7 can be atomized for the second time with the urea to obtain ammonia.

[0039] The present invention also provides a working method of a high-efficiency mixing pipeline device, comprising the following steps:

[0040] Step 1: exhaust gas enters from the air inlet of the air inlet cover module 1 and flows into the interior of the drainage mixing tube 6. When the internal temperature of the high-efficiency mixing pipeline device reaches 200°C, the urea nozzle 2 discharges a columnar urea aqueous solution to the grid-shaped mixer 4 at a fixed pressure, and the exhaust gas and urea are quickly atomized once by the grid-shaped mixer 4.

[0041] Step 2, the mixed gas after the primary atomization flows into the drainage mixing tube 6, and after passing through the drainage mixing tube 6, reaches the wire mesh mixer 7 for secondary atomization;

[0042] Step three, the ammonia gas obtained after the secondary atomization is uniformly provided to the subsequent process through the gas outlet of the gas outlet end cover module 8.

[0043] The present invention also provides a working principle of a high-efficiency mixing pipeline device:

[0044] like Figure 8 As shown, the exhaust gas enters from the air inlet of the intake end cover module 1 after passing through the DOC (diesel oxidation catalyst) and the DPF (diesel particulate filter), and flows into the interior of the drainage mixing tube 6. When the internal temperature of the high-efficiency mixing pipeline device reaches 200°C, the urea nozzle 2 discharges the columnar urea aqueous solution to the grid mixer 4 at a fixed pressure, and the exhaust gas and urea are quickly atomized once by the grid mixer 4; the mixed gas after the primary atomization flows into the drainage mixing tube 6. Due to the setting of the large diameter at both ends and the small diameter in the middle of the drainage mixing tube 6, the flow rate of the mixed gas is accelerated, and the mixed gas is impacted on the surface of the wire mesh mixer 7 and then atomized twice; the ammonia obtained after the secondary atomization passes through the outlet of the outlet end cover module 8 to evenly provide sufficient reducing agent for the subsequent SCR (selective catalytic reduction); under the action of the catalyst carrier, the ammonia is in the SCR (selective catalytic reduction) Reduction) after-treatment to react with nitrogen oxides (NOx) in the exhaust gas to achieve the purpose of eliminating harmful nitrogen oxides (NOx) emitted by diesel engines. The airflow direction from the intake to the outlet of the entire product is like an S shape.

[0045] In summary, the present invention provides a high-efficiency mixing pipeline device, which can achieve rapid and sufficient mixing of urea and exhaust gas in a sufficient space, reduce the difficulty of manufacturability, greatly improve product competitiveness, and has a simple structure and strong practicality.

[0046] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for operating a high-efficiency mixing pipeline device, the high-efficiency mixing pipeline device comprising a drainage mixing tube (6), characterized in that: The outer periphery of the drainage mixing tube (6) is matched and connected with an insulation tube (5), the two ends of the insulation tube (5) are respectively an air inlet end and an air outlet end, the inner wall of the air inlet end is connected with a grid-shaped mixer (4), and the inner wall of the air outlet end is connected with a wire mesh mixer (7); the outer wall of the air inlet end is matched and connected with an air inlet end cover module (1), and the side of the air inlet end cover module (1) away from the grid-shaped mixer (4) is connected with a urea nozzle base (3), and the urea nozzle base (3) is matched and correspondingly arranged with the grid-shaped mixer (4). A urea nozzle (2) is connected to the urea nozzle base (3), and the urea nozzle (2) is communicated with the interior of the air inlet cover module (1) through the urea nozzle base (3); the outer wall of the air outlet end is matched and connected with the air outlet cover module (8); the air inlet cover module (1) and the air outlet cover module (8) are both perpendicular to the axis of the heat insulation pipe (5); wherein the grid-shaped mixer (4) includes a plurality of vertically intersecting grid sheets, and the grid sheets face the side of the grid-shaped mixer (4) close to the wire mesh mixer (7); The working method of the high-efficiency mixing pipeline device includes: Step 1: exhaust gas enters from the air inlet of the air inlet end cover module (1) and flows into the interior of the drainage mixing pipe (6); when the internal temperature of the high-efficiency mixing pipe device reaches 200° C., the urea nozzle (2) discharges a columnar urea aqueous solution at a fixed pressure to the grid-shaped mixer (4), and the exhaust gas and urea are quickly atomized once by the grid-shaped mixer (4); Step 2: the mixed gas after the primary atomization flows into the drainage mixing tube (6), passes through the drainage mixing tube (6), and then reaches the wire mesh mixer (7) for secondary atomization; Step 3, the ammonia gas obtained after the secondary atomization is uniformly provided to the subsequent process through the gas outlet of the gas outlet end cover module (8); The drainage mixing tube (6) has a first circular arc (602) at one end close to the wire mesh mixer (7) and a second circular arc (603) at the other end. The first circular arc (602) and the second circular arc (603) both extend toward the inner wall of the insulation tube (5), and the outer walls at both ends of the drainage mixing tube (6) are tightly fitted with the inner wall of the insulation tube (5). The diameter of the drainage mixing tube (6) is large at both ends and small in the middle.

2. The method for operating a high-efficiency mixing pipeline device according to claim 1, characterized in that: The air inlet end cover module (1) and the air outlet end cover module (8) are both hollow shells, and the air inlet end cover module (1) and the air outlet end cover module (8) have an air inlet and an air outlet on one side close to the heat insulation pipe (5), respectively, and the air inlet and the air outlet are connected to the interior of the drainage mixing pipe (6).

3. The method for operating a high-efficiency mixing pipeline device according to claim 2, characterized in that: The inner angle α between the first reference line of the air inlet and the second reference line of the air outlet is 40°~60°; the first reference line is a perpendicular line from the center of the air inlet to the central axis of the insulation tube (5), and the second reference line is a perpendicular line from the center of the air outlet to the central axis of the insulation tube (5).

4. The method for operating a high-efficiency mixing pipeline device according to claim 1, characterized in that: The outer wall of the air inlet end cover module (1) comprises a first outer wall and a second outer wall, and a first high-temperature resistant glass fiber wool (101) is provided between the first outer wall and the second outer wall; the outer wall of the air outlet end cover module (8) comprises a third outer wall and a fourth outer wall, and a second high-temperature resistant glass fiber wool (801) is provided between the third outer wall and the fourth outer wall; and a third high-temperature resistant glass fiber wool (601) is provided between the drainage mixing pipe (6) and the insulation pipe (5).

5. The method for operating a high-efficiency mixing pipeline device according to claim 4, characterized in that: The heat-resistant temperature of the first high-temperature resistant glass fiber cotton (101), the second high-temperature resistant glass fiber cotton (801), and the third high-temperature resistant glass fiber cotton (601) is 650-850°C.

6. The method for operating a high-efficiency mixing pipeline device according to claim 1, characterized in that: The radius ratio of the first circular arc (602) to the second circular arc (603) is 1 / 6 to 1 / 4.

7. The method for operating a high-efficiency mixing pipeline device according to claim 1, characterized in that: The ratio of the diameter D of the drainage mixing tube (6) to its length L is 1 / 6 to 1 / 8.

8. The method for operating a high-efficiency mixing pipeline device according to claim 1, characterized in that: The wire mesh mixer (7) includes wire meshes interwoven with each other.

Images