Engine exhaust aftertreatment mixing device

Abstract

The invention discloses an engine exhaust aftertreatment mixing device, and relates to the technical field of engine exhaust treatment devices, the engine exhaust aftertreatment mixing device comprises a primary filter assembly, a secondary filter assembly and a mixing assembly, the output end of the primary filter assembly communicates with the input end of the secondary filter assembly, and the mixing assembly is arranged in the communicating area of the primary filter assembly and the secondary filter assembly; the mixing blades enable airflow to form rotational flow and increase the flow speed, the arc design of the mixing blades can change the flowing direction of the airflow and increase the turbulence degree of the airflow in the circulation groove, a urea solution and tail gas are fully mixed, the advection groove can further disturb the airflow and enhance the mixing effect, and meanwhile the impact force of the airflow on the mixing blades is reduced. And the service life of the mixing blade is prolonged, so that the formed ammonia gas is fully mixed with the tail gas before reaching the catalyst core, the contact opportunity of urea and nitrogen oxides in the tail gas is increased, the reaction efficiency is improved, the uniform distribution of the ammonia gas is ensured, and urea crystallization is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of engine exhaust treatment devices, and in particular to an engine exhaust after-treatment mixing device. Background Art

[0002] The exhaust gas emitted by automobiles is mainly composed of carbon monoxide (CO), hydrocarbons (HC) and nitrogen oxides (NOX). When they accumulate to a certain level in the air, nitrogen compounds and hydrocarbons will react under the action of sunlight to generate photochemical smog containing nitrogen dioxide (NO2) and ozone (O3). Both substances are difficult to dissolve in water. When inhaled, they will go straight into the lungs. When the concentration is high, it can cause toxic edema. When it enters the blood, it can form denatured hemoglobin, causing tissue hypoxia, which is extremely harmful to people's health. In addition, hydrogen hydroxide will form acid rain after entering the atmosphere, which harms the ecological environment. With the increasing number of cars, countries around the world are paying more and more attention to the emission of automobile exhaust. Generally, automobile exhaust is treated and decomposed through engine exhaust after-treatment mixing devices.

[0003] When most existing diesel engine exhaust after-treatment mixing devices are in use, the urea sprayed from the nozzles has low hydrolysis efficiency inside the device, and also suffers from uneven ammonia distribution and urea crystallization, causing many inconveniences in exhaust gas treatment.

[0004] In summary, most diesel engine exhaust aftertreatment mixing devices in the prior art have the problem that the urea sprayed from the nozzles has low hydrolysis efficiency inside the device during use, and also suffers from uneven ammonia distribution and urea crystallization. Summary of the Invention

[0005] The purpose of the present invention is to provide an engine exhaust after-treatment mixing device to solve the technical problems of most existing diesel vehicle engine exhaust after-treatment mixing devices, such as low hydrolysis efficiency of urea sprayed from the nozzle inside the device during use, uneven ammonia distribution and urea crystallization.

[0006] The technical problem to be solved by the present invention can be achieved through the following technical solutions:

[0007] An engine exhaust aftertreatment mixing device,

[0008] It includes a primary filter component, a secondary filter component and a mixing component. The output end of the primary filter component is connected to the input end of the secondary filter component, and a mixing component is provided in the connecting area between the two.

[0009] The mixing component includes a nozzle, a mixing tube cavity disposed at the output end of the nozzle, a first diversion groove and a second diversion groove opened at the bottom of the mixing tube cavity, a U-shaped plate disposed at one end of the mixing tube cavity away from the nozzle, a sleeve groove opened on one side of the U-shaped plate and matching the mixing tube cavity, a circulation groove opened on the other side of the U-shaped plate, a limiting enclosure closely attached to the inner wall of the circulation groove, mixing blades equally spaced inside the limiting enclosure, and the mixing blades are arc-shaped plates, a flat flow groove opened on the convex surface of the bent part of the mixing blade, several groups of stepped grooves symmetrically opened on both sides of the top of the mixing tube cavity at intervals, and a dispersion component movably disposed on the stepped grooves for dispersing urea.

[0010] Preferably, the primary filtration component includes a first housing, and a tail gas pipe, a first air pipe and a second air pipe for air intake are disposed at the bottom of the first housing.

[0011] Preferably, the secondary filtration component includes a second housing, and the second housing is located on one side of the first housing, and an exhaust pipe for exhaust is disposed at the bottom of the second housing.

[0012] Preferably, a sealing cover for protecting the mixing component is disposed at the tops of the first housing and the second housing.

[0013] Preferably, connecting plates that cooperate with each other are disposed on both sides of the first housing and the second housing close to each other, positioning sleeves are disposed outside the tops of the first housing and the second housing, and a first fixing plate and a second fixing plate for fixing are respectively disposed on the outer sides of the first housing and the second housing.

[0014] Preferably, a first sampling tube is disposed outside the sealing cover close to the second housing, and a second sampling tube is disposed at the bottom end of the U-shaped plate.

[0015] Preferably, a filter core is disposed inside the first housing, a catalyst core is disposed inside the second housing, and a filter plate is disposed at the top end inside the first housing, and the filter plate is located below the mixing component.

[0016] Preferably, the dispersion component includes several groups of side plates symmetrically disposed on both sides of the mixing tube cavity, and the side plates are located below the stepped grooves, supports are symmetrically disposed at the tops of the side plates, and a rotating shaft is rotatably disposed at the top of the supports.

[0017] Preferably, an evaporation plate is disposed between the rotating shafts, a positioning gear is disposed at one end of the rotating shaft away from the evaporation plate, and a limiting tooth plate that cooperates with it is disposed above the positioning gear.

[0018] Preferably, clamping plates I are symmetrically arranged on both sides of the top of the side plate. A traction rod is rotatably arranged inside the clamping plate I. The top end of the traction rod is rotatably provided with a clamping plate II. An fixing plate is arranged on the top of the clamping plate II. A traction tension spring for pulling the limiting tooth plate is arranged on the top of the fixing plate.

[0019] Advantages of the present invention:

[0020] 1. In the present invention, the mixing blades make the air flow form a swirl, increasing the flow rate. And the arc design of the mixing blades can change the flow direction of the air flow, increasing the turbulence degree of the air flow in the flow channel, enabling the urea solution to be fully mixed with the tail gas. The straight flow channel can further disrupt the air flow, enhancing the mixing effect, while reducing the impact force of the air flow on the mixing blades and extending the service life of the mixing blades. Thus, the formed ammonia is fully mixed with the tail gas, achieving full mixing before reaching the catalyst core. Through the synergistic effect of the shunt channels, mixing blades, straight flow channels and the dispersion components in the mixing assembly, the urea solution and the tail gas can be fully mixed, increasing the contact opportunity between the urea and the nitrogen oxides in the tail gas, improving the reaction efficiency, ensuring uniform ammonia distribution and avoiding urea crystallization;

[0021] 2. In the present invention, the rotating shaft enables the evaporation plate to rotate within a certain angle range. The staff can adjust the deflection angle of the evaporation plate according to actual needs, which is flexible and convenient. The evaporation plate is used to disperse the urea solution, increasing the contact area between the urea solution and the tail gas, promoting the evaporation and decomposition of the urea, improving the reaction efficiency and being more conducive to urea hydrolysis. The positioning gear is used to position the rotation angle of the evaporation plate to ensure the stability of the evaporation plate during operation. The traction rod and the traction tension spring cooperate to play a role in traction and force transmission, making the limiting tooth plate and the positioning gear keep in close meshing, preventing the evaporation plate from shaking due to air flow impact during operation. Description of the drawings

[0022] The present invention will be further described below with reference to the drawings.

[0023] Figure 1 is the first three-dimensional schematic diagram of the whole device in the present invention;

[0024] Figure 2 is the second three-dimensional schematic diagram of the whole device in the present invention;

[0025] Figure 3 is the third three-dimensional schematic diagram of the whole device in the present invention;

[0026] Figure 4 is the first three-dimensional schematic diagram of the whole device in the present invention;

[0027] Figure 5 is the three-dimensional schematic diagram of the U-shaped plate in the present invention;

[0028] Figure 6 It is a three-dimensional schematic diagram of the mixing cavity in the present invention;

[0029] Figure 7 is the present invention Figure 4 The enlarged schematic diagram at position A in it.

[0030] In the figure: 1. The first housing; 2. The second housing; 3. The sealing cover; 4. The tail gas pipe; 5. The first air pipe; 6. The second air pipe; 7. The exhaust pipe; 8. The nozzle; 9. The connecting plate; 10. The positioning sleeve; 11. The first fixing plate; 12. The second fixing plate; 13. The first sampling pipe; 14. The second sampling pipe; 15. The filter core; 16. The catalyst core; 17. The filter plate; 18. The mixing cavity; 19. The first diversion groove; 20. The second diversion groove; 21. The C-shaped plate; 22. The sleeve groove; 23. The flow-through groove; 24. The limiting enclosure; 25. The mixing blade; 26. The laminar flow groove; 27. The stepped groove; 28. The side plate; 29. The bracket; 30. The rotating shaft; 31. The evaporation plate; 32. The positioning gear; 33. The limiting tooth plate; 34. The first clamping plate; 35. The traction rod; 36. The second clamping plate; 37. The fixing plate; 38. The traction tension spring. Specific embodiments

[0031] The following describes the specific embodiments of the present invention in detail, but it should be understood that the protection scope of the present invention is not limited by the specific embodiments.

[0032] As Figure 1-7 shown, an engine exhaust aftertreatment mixing device is provided with a heating mechanism inside for heating the urea solution.

[0033] It includes a primary filtration component, a secondary filtration component and a mixing component. The output end of the primary filtration component is communicated with the input end of the secondary filtration component, and a mixing component is arranged in the communication area between the two;

[0034] The mixing component includes a nozzle 8, a mixing tube cavity 18 disposed at the output end of the nozzle 8, a first shunt groove 19 and a second shunt groove 20 opened at the bottom of the mixing tube cavity 18, a C-shaped plate 21 disposed at one end of the mixing tube cavity 18 away from the nozzle 8, a sleeve groove 22 opened on one side of the C-shaped plate 21 and matching the mixing tube cavity 18, a circulation groove 23 opened on the other side of the C-shaped plate 21, a limiting enclosure 24 fitted to the inner wall of the circulation groove 23, mixing blades 25 equally spaced inside the limiting enclosure 24, and the mixing blades 25 are arc-shaped plates. A straight flow groove 26 is opened on the convex surface of the bent part of the mixing blade 25. A number of groups of spaced stepped grooves 27 are symmetrically opened on both sides of the top of the mixing tube cavity 18. A dispersion component for dispersing urea is movably disposed on the stepped grooves 27. The nozzle 8 is used to spray urea solution. The urea solution and the tail gas are mixed in the mixing component. Urea decomposes at high temperature to produce ammonia, and the ammonia reacts with nitrogen oxides in the tail gas to convert them into nitrogen and water, thereby reducing nitrogen oxide emissions. The mixing tube cavity 18 is disposed at the output end of the nozzle 8 to provide a space for the mixing of the urea solution and the tail gas. The first shunt groove 19 and the second shunt groove 20 are opened at the bottom of the mixing tube cavity 18, and their function is to shunt the tail gas entering the mixing tube cavity 18 so that they can contact and mix with the urea solution more fully, improving the mixing effect. The C-shaped plate 21 plays a role in guiding the air flow and further mixing. The sleeve groove 22 is used to accurately connect the C-shaped plate 21 and the mixing tube cavity 18 to ensure the stability of the device structure. The circulation groove 23 provides a circulation channel for the mixed gas. The limiting enclosure 24 plays a role in limiting and fixing the mixing blades 25 to prevent the mixing blades 25 from shifting during operation. The mixing blades 25 make the air flow form a swirl, increasing the flow rate, and the arc design of the mixing blades 25 can change the flow direction of the air flow, increasing the turbulence degree of the air flow in the circulation groove 23, making the urea solution and the tail gas mix fully. The straight flow groove 26 can further disrupt the air flow, enhancing the mixing effect, while reducing the impact force of the air flow on the mixing blades 25 and extending the service life of the mixing blades 25. Thus, the formed ammonia is fully mixed with the tail gas to form a full mix before reaching the catalyst core 16. The stepped grooves 27 are used to install the dispersion component, providing an installation position and support for the dispersion component

[0035] In this embodiment, specifically, the primary filtration component includes a first housing 1. At the bottom of the first housing 1, there are a tail gas pipe 4 for intake, a first air pipe 5, and a second air pipe 6. Inside the first housing 1, there is a filter core 15. At the top end inside the first housing 1, there is a filter plate 17, and the filter plate 17 is located below the mixing component. The tail gas pipe 4 is used to introduce the tail gas discharged from the engine. The first air pipe 5 and the second air pipe 6 can be used as standby intake channels or for introducing other auxiliary gases to increase the intake flexibility of the device. There are a filter core 15 and a filter plate 17 inside the first housing 1. The filter core 15 can preliminarily filter the incoming tail gas to remove impurities with larger particles. The filter plate 17 is located below the mixing component and can further filter the tail gas to prevent impurities from entering the mixing component and affecting its normal operation.

[0036] In this embodiment, specifically, the secondary filtration component includes a second housing 2, and the second housing 2 is located on one side of the first housing 1. At the bottom of the second housing 2, there is an exhaust pipe 7 for exhaust. Inside the second housing 2, there is a catalyst core 16, which is made of SCR catalyst. The tail gas after primary filtration and mixing treatment enters the second housing 2. Under the action of the catalyst core 16, the nitrogen oxides in the tail gas are reduced to nitrogen and water, and finally discharged through the exhaust pipe 7 to achieve deep purification of the tail gas.

[0037] In this embodiment, specifically, a sealing cover 3 for protecting the mixing component is provided at the top of the first housing 1 and the second housing 2. The sealing cover 3 is used to protect the mixing component and prevent external impurities from entering the device and affecting the normal operation of the device.

[0038] In this embodiment, specifically, on both sides of the first housing 1 and the second housing 2 that are close to each other, there are cooperating connecting plates 9. On the outer sides of the tops of the first housing 1 and the second housing 2, there are positioning sleeves 10. On the outer sides of the first housing 1 and the second housing 2, there are respectively a first fixing plate 11 and a second fixing plate 12 for fixing. The connecting plates 9 are used to connect the first housing 1 and the second housing 2 to ensure the tightness of their connection. The positioning sleeves 10 play a role in positioning and auxiliary fixing to further enhance the stability when the first housing 1 and the second housing 2 are fixed. The first fixing plate 11 and the second fixing plate 12 are used to fix the entire device to other equipment to ensure the stability of the device.

[0039] In this embodiment, specifically, on the outer side of the sealing cover 3 close to the second housing 2, there is a first sampling pipe 13. At the bottom end of the C-shaped plate 21, there is a second sampling pipe 14. The first sampling pipe 13 is used to sample from the area between the primary filtration component and the mixing component to detect the composition and state of the tail gas after primary filtration and preliminary mixing. The second sampling pipe 14 is used to detect the gas after catalytic decomposition.

[0040] In this embodiment, specifically, the dispersion component includes several groups of side plates 28 symmetrically arranged on both sides of the mixing tube cavity 18, and the side plates 28 are located below the stepped groove 27. Brackets 29 are symmetrically arranged on the top of the side plates 28, and a rotating shaft 30 is rotatably arranged on the top of the brackets 29. An evaporation plate 31 is arranged between the rotating shafts 30, and a positioning gear 32 is arranged at the end of the rotating shaft 30 away from the evaporation plate 31. A limiting tooth plate 33 that matches the positioning gear 32 is arranged above the positioning gear 32. Clamps 1 34 are symmetrically arranged on both sides of the top of the side plates 28, and a traction rod 35 is rotatably arranged inside the clamps 1 34. A clamp 2 36 is rotatably arranged on the top of the traction rod 35. A fixed plate 37 is arranged on the top of the clamp 2 36, and a traction pull for traction on the limiting tooth plate 33 is arranged on the top of the fixed plate 37. The spring 38 and the side plate 28 serve to support and fix other components. The bracket 29 is used to support the rotating shaft 30. The rotating shaft 30 can rotate the evaporation plate 31 within a certain angle range. The staff can adjust the deflection angle of the evaporation plate 31 according to actual needs, which is flexible and convenient. The evaporation plate 31 is used to disperse the urea solution, increase the contact area between the urea solution and the exhaust gas, promote the evaporation and decomposition of urea, improve the reaction efficiency, and be more conducive to urea hydrolysis. The positioning gear 32 is used to position the rotation angle of the evaporation plate 31 to ensure the stability of the evaporation plate 31 during operation. The traction rod 35 and the traction spring 38 cooperate to play the role of traction and transmission force, so that the limit tooth plate 33 and the positioning gear 32 remain closely engaged to prevent the evaporation plate 31 from shaking due to airflow impact during operation.

[0041] The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0042] The working principle of the present invention is as follows: the exhaust gas discharged by the engine enters the No. 1 shell 1 through the exhaust pipe 4. Under the action of the filter element 15 and the filter plate 17, the larger particulate impurities in the exhaust gas are filtered out, and the urea solution is sprayed into the mixing tube cavity 18 through the nozzle 8, and is preliminarily mixed with the exhaust gas entering the mixing tube cavity 18. During the mixing process, the diverter groove 19 and the diverter groove 2 20 divert the exhaust gas so that it can more fully contact the urea solution. The mixed gas enters the flow groove 23. Under the action of the mixing blade 25, the flow direction of the airflow is changed, the turbulence degree is increased, and the urea solution and the exhaust gas are further fully mixed. At the same time, the horizontal flow groove 26 further disrupts the airflow and enhances the mixing effect. The evaporation plate 31 in the dispersion component disperses the urea solution into smaller droplets, increases the contact area between the urea solution and the exhaust gas, and promotes the evaporation and decomposition of urea. The gas after full mixing and reaction enters the No. 2 shell 2. Under the action of the catalyst core 16, the harmful substances in the exhaust gas undergo chemical reactions and are converted into harmless substances, and finally discharged through the exhaust pipe 7.

[0043] The above disclosures are only a few specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the scope of protection of the present invention.

Claims

1. An engine exhaust after-treatment mixing device, characterized in that: It includes a primary filtration component, a secondary filtration component and a mixing component. The output end of the primary filtration component is communicated with the input end of the secondary filtration component, and a mixing component is arranged in the communication area between the two; The mixing component includes a nozzle (8), a mixing tube cavity (18) arranged at the output end of the nozzle (8), a first diversion groove (19) and a second diversion groove (20) opened at the bottom of the mixing tube cavity (18), a U-shaped plate (21) arranged at one end of the mixing tube cavity (18) far from the nozzle (8), a sleeve groove (22) opened on one side of the U-shaped plate (21) and matching the mixing tube cavity (18), a flow-through groove (23) opened on the other side of the U-shaped plate (21), a limiting enclosure (24) fitted on the inner wall of the flow-through groove (23), mixing blades (25) equally spaced inside the limiting enclosure (24), and the mixing blades (25) are arc-shaped plates, a flat-flow groove (26) opened on the convex surface of the bent part of the mixing blade (25), a number of groups of stepped grooves (27) symmetrically opened on both sides of the top of the mixing tube cavity (18) and distributed at intervals, and a dispersion component movably arranged on the stepped grooves (27) for dispersing urea.

2. The engine exhaust after-treatment mixing device according to claim 1, characterized in that: The primary filtration component includes a first housing (1), and a tail gas pipe (4), a first air pipe (5) and a second air pipe (6) for intake are arranged at the bottom of the first housing (1).

3. The engine exhaust after-treatment mixing device according to claim 2, characterized in that: The secondary filtration component includes a second housing (2), and the second housing (2) is located on one side of the first housing (1), and an exhaust pipe (7) for exhaust is arranged at the bottom of the second housing (2).

4. The engine exhaust after-treatment mixing device according to claim 3, characterized in that: Sealing covers (3) for protecting the mixing component are arranged at the tops of the first housing (1) and the second housing (2).

5. The engine exhaust after-treatment mixing device according to claim 3, characterized in that: Connecting plates (9) that cooperate with each other are arranged on one side of the first housing (1) and the second housing (2) close to each other. A positioning sleeve (10) is arranged outside the tops of the first housing (1) and the second housing (2). Fixing plates one (11) and fixing plates two (12) for fixing are respectively arranged on the outer sides of the first housing (1) and the second housing (2).

6. The engine exhaust after-treatment mixing device according to claim 4, characterized in that: A first sampling pipe (13) is arranged outside the sealing cover (3) close to the second housing (2), and a second sampling pipe (14) is arranged at the bottom end of the U-shaped plate (21).

7. The engine exhaust after-treatment mixing device according to claim 1, characterized in that: A filter core (15) is arranged inside the first housing (1), a catalyst core (16) is arranged inside the second housing (2), and a filter plate (17) is arranged at the top end inside the first housing (1), and the filter plate (17) is located below the mixing component.

8. The engine exhaust after-treatment mixing device according to claim 1, characterized in that: The dispersion component includes a number of groups of side plates (28) symmetrically arranged on both sides of the mixing tube cavity (18), and the side plates (28) are located below the stepped grooves (27). Supports (29) are symmetrically arranged at the tops of the side plates (28), and a rotating shaft (30) is rotatably arranged at the tops of the supports (29).

9. The engine exhaust after-treatment mixing device according to claim 8, characterized in that: An evaporation plate (31) is provided between the rotating shafts (30), a positioning gear (32) is provided at one end of the rotating shaft (30) away from the evaporation plate (31), and a position limiting tooth plate (33) matched with the positioning gear (32) is provided above the positioning gear (32).

10. The engine exhaust after-treatment mixing device according to claim 9, characterized in that: A first clamping plate (34) is symmetrically provided on both sides of the top of the side plate (28), a traction rod (35) is rotatably provided inside the first clamping plate (34), a second clamping plate (36) is rotatably provided at the top end of the traction rod (35), a fixed plate (37) is provided on the top of the second clamping plate (36), and a traction spring (38) is provided on the top of the fixed plate (37) for traction of the limiting tooth plate (33).

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