CN115059529A - Urea mixing arrangement - Google Patents
Urea mixing arrangement Download PDFInfo
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- CN115059529A CN115059529A CN202210769269.0A CN202210769269A CN115059529A CN 115059529 A CN115059529 A CN 115059529A CN 202210769269 A CN202210769269 A CN 202210769269A CN 115059529 A CN115059529 A CN 115059529A
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- Prior art keywords
- plate
- crushing
- air inlet
- urea
- shell
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- 239000004202 carbamide Substances 0.000 title claims abstract description 77
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 238000000746 purification Methods 0.000 claims abstract description 5
- 238000005192 partition Methods 0.000 claims description 23
- 238000005507 spraying Methods 0.000 claims 2
- 238000002347 injection Methods 0.000 abstract description 4
- 239000007924 injection Substances 0.000 abstract description 4
- 239000007789 gas Substances 0.000 description 23
- 239000007864 aqueous solution Substances 0.000 description 15
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 10
- 239000000243 solution Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000002425 crystallisation Methods 0.000 description 4
- 230000008025 crystallization Effects 0.000 description 4
- 238000010531 catalytic reduction reaction Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000000197 pyrolysis Methods 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- ODUCDPQEXGNKDN-UHFFFAOYSA-N Nitrogen oxide(NO) Natural products O=N ODUCDPQEXGNKDN-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 150000003672 ureas Chemical class 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1486—Means to prevent the substance from freezing
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention provides a urea mixing device, comprising: the exhaust gas purification device comprises an air inlet plate, a first exhaust pipe and a second exhaust pipe, wherein two first air inlet holes are formed in the air inlet plate and are arranged at intervals, and the first air inlet holes are used for allowing tail gas to enter; the air outlet plate is provided with at least one air outlet hole; the shell, the inlet plate with the air outlet plate is located the front side of shell, the shell is close to the one end of inlet plate is equipped with the nozzle base, the nozzle base is used for connecting urea injection system. The structural design of the air inlet plate and the air outlet plate improves the distribution uniformity of urea, is not easy to crystallize, can ensure that the urea can be uniformly distributed on the end surface of the SCR carrier, enables the exhaust gas and the urea to be uniformly mixed, and improves the SCR efficiency.
Description
Technical Field
The invention belongs to the technical field of diesel vehicle tail gas aftertreatment, and particularly relates to a urea mixing device.
Background
In diesel exhaust aftertreatment systems, Selective Catalytic Reduction (SCR) is commonly used to reduce NO in the exhaust X The selective catalytic reduction technology is to spray urea aqueous solution into a tail gas aftertreatment mixer, and Nitrogen Oxide (NO) in the tail gas is treated under the action of a catalyst X ) Reduction to harmless nitrogen (N) 2 ) And water (H) 2 O) to achieve the aim of reducing emissions. The existing urea mixing device has poor urea mixing uniformity, is easy to form urea crystals, has large back pressure, influences the performance of an after-treatment system, and even causes the exhaust exceeding the standard or the after-treatment system is blocked to cause insufficient vehicle power.
Disclosure of Invention
Aiming at the defects in the prior art, the embodiment of the invention provides the urea mixing device which is low in back pressure, small in size, uniform in exhaust gas and urea mixing and high in SCR efficiency. In order to achieve the technical purpose, the embodiment of the invention adopts the technical scheme that:
the embodiment of the invention provides a urea mixing device, which comprises:
the exhaust gas purification device comprises an air inlet plate, a first exhaust pipe and a second exhaust pipe, wherein two first air inlet holes are formed in the air inlet plate and are arranged at intervals, and the first air inlet holes are used for allowing tail gas to enter;
the air outlet plate is provided with at least one air outlet hole;
the shell, the inlet plate with the air outlet plate is located the front side of shell, the shell is close to the one end of inlet plate is equipped with the nozzle base, the nozzle base is used for connecting urea injection system.
Furthermore, the air inlet plate is also provided with at least one second air inlet hole, the second air inlet hole is arranged between the two first air inlet holes, and the second air inlet hole is used for tail gas to enter;
any one of the second air inlet holes is close to one side of the nozzle base, and one side of the air inlet plate 1 close to the shell is provided with a turnover vane, and the turnover vane is used for limiting the direction of the air flow so that the air flow flows towards the air outlet plate.
Furthermore, one side of the air inlet plate, which is close to the shell, is provided with a crushing plate, the crushing plate is provided with at least one crushing hole, and the crushing plate is positioned on one side of the first air inlet hole, which is close to the air outlet plate, and faces the nozzle base.
Further, the crushing plates include a first crushing plate and a second crushing plate; the first crushing plate and the second crushing plate are arranged in a V shape, and are not connected in the middle; the V-shaped opening faces the nozzle base;
one side of each crushing plate, which is far away from the nozzle base, and one side of any crushing hole, which is close to the outer side, are connected with crushing blades;
the crushing blades are folded towards one side departing from the nozzle base.
Furthermore, a plurality of crushing holes are respectively arranged on the first crushing plate and the second crushing plate at equal intervals, and the crushing holes on the first crushing plate and the crushing holes on the second crushing plate are symmetrically distributed.
Further, the nozzle base includes a first face, and an included angle between any one of the crushing blades and the first face is greater than 45 °.
Furthermore, a first long hole and a second long hole are respectively arranged on the air inlet plate and on one sides of the first crushing plate and the second crushing plate close to the nozzle base.
Furthermore, at least one adjusting hole is formed in the air inlet plate.
Furthermore, the air outlet plate is a conical ring plate, an end cover is arranged on the rear side of the air outlet plate, and the end cover is assembled on the front side of the shell; a clapboard is arranged at the rear side of the end cover;
the partition plate extends obliquely downwards from the inner wall of the shell, an airflow channel is arranged between one end of the partition plate and the inner wall of the shell, and the space in the shell and below the crushing plate is divided into a first partition space and a second partition space by the partition plate;
the end cover rear wall is provided as a closed portion with respect to the first partitioned space, and is provided as an open portion with respect to the second partitioned space.
Further, one end of the partition plate is configured in an arc shape.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
1) this application air inlet plate and air outlet plate's structural design improves the homogeneity that urea distributes, and is difficult for the crystallization, ensures that urea can evenly distributed at SCR carrier terminal surface, makes exhaust and urea homogeneous mixing, improves SCR's efficiency.
2) The application is used for the U-shaped aftertreatment structure, has the advantages of low back pressure, small size and the like, meets the strict boundary requirement of the whole vehicle on the packaging structure, has large mixing space, can adapt to nozzles with different spray cone angles, and has high mixing efficiency.
Drawings
FIG. 1 is a cross-sectional view of a urea mixing device according to an embodiment of the present invention.
FIG. 2 is a schematic diagram showing the structure of a urea mixing apparatus according to an embodiment of the present invention.
FIG. 3 is a schematic view from inside to outside of a urea mixing device according to an embodiment of the present invention.
Fig. 4 is a schematic structural diagram of the inner side of the air intake plate in the embodiment of the present invention.
FIG. 5 is a schematic view of the structure of the breaker plate in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention provides a urea mixing device, comprising:
the exhaust gas purification device comprises an air inlet plate 1, wherein two first air inlet holes 11 are formed in the air inlet plate 1, the two first air inlet holes 11 are arranged at intervals, and the first air inlet holes 11 are used for allowing tail gas to enter;
the air outlet plate 2 is provided with at least one air outlet hole 21;
the shell 3, the inlet plate 1 with it locates to go out gas plate 2 the front side of shell 3, shell 3 is close to the one end of inlet plate 1 is equipped with nozzle base 31, nozzle base 31 is used for connecting urea injection system.
In a specific embodiment, as shown in fig. 1, the air inlet plate 1 is disposed on the upper left side of the housing, and the air outlet plate 2 is disposed on the lower left side of the housing, and when the exhaust gas treatment package assembly is used in an exhaust gas treatment package assembly, in use, the air inlet plate 1 is connected to the rear end of a DPF (particulate filter) in the post-treatment unit, the air outlet plate 2 is connected to the front end of an SCR (selective catalytic reduction) in the post-treatment unit, and the exhaust gas flows into the urea mixing device through the air inlet plate 1 and flows out through the air outlet plate 2.
As shown in fig. 2 and 3, two first air inlet holes 11 are formed in the air inlet plate 1, the two first air inlet holes 11 are arranged at intervals in the left-right direction, the area of the first air inlet holes 11 is large, and exhaust air flow mainly enters the urea mixing device through the first air inlet holes 11.
And because the upper end of the shell 3 is provided with the nozzle base 31, the nozzle base 31 is used for installing a urea injection system, urea aqueous solution is injected into the urea mixing device from top to bottom through the nozzle base 31, the exhaust system has higher temperature, so that the urea aqueous solution is evaporated, urea particles are gradually reduced and have pyrolysis reaction, and then the urea can purify NO in exhaust gas X (nitrogen oxide).
The shell 3 has large mixing space, can adapt to nozzles with different spray cone angles, has wide application range, simple and reasonable structure, easy implementation and high mixing efficiency of urea and exhaust.
Furthermore, the air inlet plate 1 is also provided with at least one second air inlet hole 12, the second air inlet hole 12 is arranged between the two first air inlet holes 11, and the second air inlet hole 12 is used for tail gas to enter;
any one of the second air inlet holes 12 is provided with a turning vane 120 at a side close to the nozzle base 31 and a side of the air inlet plate 1 close to the housing 3, and the turning vane 120 is used for limiting the direction of the air flow so that the air flow flows towards the air outlet plate 2.
In a specific embodiment, as shown in fig. 2 and 3, four second air inlet holes 12 are provided on the air inlet plate 1, the four second air inlet holes 12 are sequentially arranged from top to bottom and are disposed between the two first air inlet holes 11, the structure enables air in the middle to enter the urea mixing device and to timely contact with the urea aqueous solution, and the second air inlet holes 12 are arranged to be elongated holes, so that more air can enter the urea mixing device.
In a specific embodiment, as shown in fig. 4, one turning vane 120 is correspondingly disposed on the upper edge of any one of the second air inlet holes 12, four turning vanes 120 are disposed on the inner side of the air inlet plate 1, and any one of the turning vanes 120 is disposed obliquely, so that when tail gas enters the urea mixing device through the air inlet plate 1, the air flow direction thereof is downward, and this structure can prevent the air flow from directly blowing the urea aqueous solution injected through the nozzle base 31, thereby preventing the urea aqueous solution from crystallizing in the top area of the cavity of the urea mixing device.
Further, a crushing plate 13 is arranged on one side of the air inlet plate 1 close to the housing 3, at least one crushing hole 130 is arranged on the crushing plate 13, and the crushing plate 13 is located on one side of the first air inlet hole 11 close to the air outlet plate 2 and faces the nozzle base 31.
In a specific embodiment, as shown in fig. 3 and 4, the crushing plate 13 is disposed inside the air inlet plate 1 and below the first air inlet 11, so that the crushing plate is also located below the nozzle base 31, and when the urea solution is injected, the crushing plate 13 can crush the urea solution, so that urea particles become smaller and are easier to evaporate, thereby improving the urea pyrolysis efficiency, reducing the risk of urea crystallization, and improving the SCR efficiency.
Further, the crushing plate 13 includes a first crushing plate 131 and a second crushing plate 132; the first crushing plate 131 and the second crushing plate 132 are arranged in a V shape, and are not connected in the middle; the V-shaped opening faces the nozzle base 31; a crushing blade 133 is connected to one side of each crushing plate 13, which is away from the nozzle base 31, and one side of any one crushing hole 130, which is close to the outer side; the crushing blades 133 are folded over towards the side facing away from the nozzle base 31.
In a specific embodiment, as shown in fig. 3 and 4, the first crushing plate 131 and the second crushing plate 132 are disposed inside the air inlet plate 1 in a V shape, and the lower end of the first crushing plate 131 is not connected to the lower end of the second crushing plate 132, so that the first crushing plate 131 and the second crushing plate 132 can guide the airflow to flow downward.
First crushing plate 131 is last, any the right in broken hole 130 is equipped with broken blade, on the second crushing plate 132, any the left side in broken hole 130 is equipped with broken blade, just broken blade all turns over the setting downwards, and this structure can play the water conservancy diversion effect to the air current, makes the air current flow downwards to increase the contact probability of air current and urea aqueous solution, ensure that the air current is purified by urea.
Further, a plurality of the crushing holes 130 are disposed on each of the first crushing plate 131 and the second crushing plate 132 at equal intervals, and the crushing holes 130 on the first crushing plate 131 and the crushing holes 130 on the second crushing plate 132 are symmetrically disposed.
As can be understood, the number and size of the crushing holes 130 affect the crushing effect of the crushing plates 13 on the urea aqueous solution, in a specific embodiment, as shown in fig. 4 and 5, the first crushing plate 131 is provided with four crushing holes 130, and four crushing holes 130 are distributed at equal intervals, and the second crushing plate 132 is also provided with four crushing holes 130, and four crushing holes 130 are distributed at equal intervals and symmetrically distributed with the crushing holes 130 on the first crushing plate 131, so that the structure can improve the efficiency of crushing the urea aqueous solution, and has a more uniform crushing and mixing effect on the tail gas and the urea aqueous solution, thereby being beneficial to improving the SCR efficiency.
Further, the nozzle base 31 includes a first face 310, and any one of the crushing blades 133 is at an angle greater than 45 ° to the first face 310.
In a specific embodiment, as shown in fig. 1 and 4, it can be understood that the included angle between the crushing blade 133 and the first surface 310 is too small to block the air flow, so that when the included angle between the crushing blade 133 and the first surface 310 is set to be larger than 45 °, not only the air flow is guided, but also the air flow can be ensured to pass, and the working efficiency of the urea mixing device is ensured.
Further, a first long hole 14 and a second long hole 15 are provided in the intake plate 1 on the side of the first crushing plate 131 and the second crushing plate 132 close to the nozzle base 31, respectively.
In a specific embodiment, as shown in fig. 2, 3 and 4, the first long hole 14 is provided on the air inlet plate 1 above the first crushing plate 131, the air flow can flow into the urea mixing device through the first long hole 14 and avoid the crystallization of the urea aqueous solution on the first crushing plate 131, and similarly, the second long hole 15 is provided on the air inlet plate 1 above the second crushing plate 132, the air flow flows into the urea mixing device through the second long hole 15 and avoids the crystallization of the urea aqueous solution on the second crushing plate 132, so that the structure can ensure the crushing effect of the first crushing plate 131 and the second crushing plate 132.
Furthermore, at least one adjusting hole 16 is also arranged on the air inlet plate 1.
In a specific embodiment, as shown in fig. 2, a plurality of the adjusting holes 16 are formed in the air inlet plate 1, and the back pressure of the urea mixing device can be adjusted by adjusting the number, shape and size of the adjusting holes 16.
Further, the gas outlet plate 2 is a conical ring plate, an end cover 22 is arranged on the rear side of the gas outlet plate 2, and the end cover 22 is assembled on the front side of the shell 3; a clapboard 23 is arranged at the rear side of the end cover 22;
the partition plate 23 extends obliquely downward from the inner wall of the housing 3, and an airflow passage is provided between one end 231 of the partition plate 23 and the inner wall of the housing 3, and the partition plate 23 divides a space in the housing 3 below the breaker plate 13 into a first partitioned space a and a second partitioned space b;
the rear wall of the end cap 22 is provided as a closed portion with respect to the first partitioned space a, and the rear wall of the end cap 22 is provided as an open portion with respect to the second partitioned space b.
In a specific embodiment, as shown in fig. 1 and 3, the left side of the end cap 22 is fixedly connected to the air outlet plate 2, the right side of the end cap 22 is assembled to the left side of the housing 3, the partition plate 23 is disposed at the rear side of the end cap 22 and divides the lower portion of the urea mixing device into a first partition space a above and a second partition space b below, since the rear wall of the end cap 22 is disposed as a closed portion with respect to the first partition space a and the lower end of the partition plate 23 and the inner wall of the housing 3 are provided with an air flow passage, the air flow and urea will enter the second partition space b from the first partition space a through the air flow passage and enter the end cap 22 from the opening of the end cap 22, and then flow out of the urea mixing device through the air outlet plate, which can play a role of swirling flow to the air flow and further mix the air flow and the urea aqueous solution, the contact between the air flow and the urea aqueous solution is increased, and the tail gas purification efficiency of the urea aqueous solution is improved.
The gas outlet plate 2 is designed into a conical ring plate, and the gas outlet holes 21 are formed in the conical ring plate, so that gas flow and urea can be uniformly distributed in front of the SCR, and the SCR efficiency is improved. It can be understood that by adjusting the number, size and shape of the openings on the left side of the air outlet plate 2 and the air outlet holes 21, the uniformity of the distribution of the air flow and urea before the SCR can be adjusted, and the back pressure of the urea mixing device can also be adjusted.
Further, one end 231 of the partition 23 is configured in an arc shape to increase a swirling effect of the air flow.
Finally, it should be noted that the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, which should be covered by the claims of the present invention.
Claims (10)
1. A urea mixing device, comprising:
the exhaust gas purification device comprises an air inlet plate (1), wherein two first air inlet holes (11) are formed in the air inlet plate (1), the two first air inlet holes (11) are arranged at intervals, and the first air inlet holes (11) are used for allowing tail gas to enter;
the air outlet plate (2), the air outlet plate (2) is provided with at least one air outlet hole (21);
the urea spraying device comprises a shell (3), wherein the air inlet plate (1) and the air outlet plate (2) are arranged on the front side of the shell (3), the shell (3) is close to a nozzle base (31) arranged at one end of the air inlet plate (1), and the nozzle base (31) is used for being connected with a urea spraying system.
2. Urea mixing device according to claim 1,
the air inlet plate (1) is also provided with at least one second air inlet hole (12), the second air inlet hole (12) is arranged between the two first air inlet holes (11), and the second air inlet hole (12) is used for tail gas to enter;
any one side of the second air inlet hole (12) close to the nozzle base (31) and one side of the air inlet plate 1 close to the shell (3) are provided with a turning vane (120), and the turning vane (120) is used for limiting the direction of the air flow so that the air flow flows towards the air outlet plate (2).
3. Urea mixing device according to claim 1,
one side of the air inlet plate (1) close to the shell (3) is provided with a crushing plate (13), the crushing plate (13) is provided with at least one crushing hole (130), and the crushing plate (13) is located on one side of the first air inlet hole (11) close to the air outlet plate (2) and faces the nozzle base (31).
4. Urea mixing device according to claim 3,
the crushing plate (13) comprises a first crushing plate (131) and a second crushing plate (132); the first crushing plate (131) and the second crushing plate (132) are arranged in a V shape and are not connected in the middle; the V-shaped opening faces the nozzle base (31);
a crushing blade (133) is connected to one side of each crushing plate (13) departing from the nozzle base (31) and one side of any crushing hole (130) close to the outer side;
the crushing blade (133) is folded towards the side facing away from the nozzle base (31).
5. Urea mixing device according to claim 4,
the first crushing plate (131) and the second crushing plate (132) are respectively provided with a plurality of crushing holes (130) which are distributed at equal intervals, and the crushing holes (130) on the first crushing plate (131) and the crushing holes (130) on the second crushing plate (132) are symmetrically distributed.
6. Urea mixing device according to claim 4,
the nozzle base (31) comprises a first face (310), and the angle between any one of the crushing blades (133) and the first face (310) is greater than 45 °.
7. Urea mixing device according to claim 4,
and a first long hole (14) and a second long hole (15) are respectively formed in the air inlet plate (1) and on the sides, close to the nozzle base (31), of the first crushing plate (131) and the second crushing plate (132).
8. Urea mixing device according to claim 1, characterized in that,
the air inlet plate (1) is also provided with at least one adjusting hole (16).
9. Urea mixing device according to claim 3,
the gas outlet plate (2) is a conical ring plate, an end cover (22) is arranged on the rear side of the gas outlet plate (2), and the end cover (22) is assembled on the front side of the shell (3); a clapboard (23) is arranged at the rear side of the end cover (22);
the partition plate (23) extends obliquely downwards from the inner wall of the shell (3), an airflow channel is arranged between one end (231) of the partition plate (23) and the inner wall of the shell (3), and the partition plate (23) divides the space in the shell (3) below the crushing plate (13) into a first partition space (a) and a second partition space (b);
the end cap (22) rear wall is provided as a closed portion with respect to the first partitioned space (a), and the end cap (22) rear wall is provided as an open portion with respect to the second partitioned space (b).
10. Urea mixing device according to claim 9,
one end (231) of the partition plate (23) is configured to be arc-shaped.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210769269.0A CN115059529A (en) | 2022-06-30 | 2022-06-30 | Urea mixing arrangement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210769269.0A CN115059529A (en) | 2022-06-30 | 2022-06-30 | Urea mixing arrangement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
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| CN216077273U (en) * | 2021-08-13 | 2022-03-18 | 无锡恒和环保科技有限公司 | A blender and U type tail gas aftertreatment device for U type tail gas aftertreatment device |
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| CN217233627U (en) * | 2022-05-20 | 2022-08-19 | 无锡亿利环保科技有限公司 | U-shaped post-treatment urea mixing device |
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| CN111156072A (en) * | 2019-12-19 | 2020-05-15 | 河北亿利橡塑集团有限公司 | Tail gas aftertreatment mixing arrangement |
| DE102020101226A1 (en) * | 2020-01-20 | 2021-07-22 | Friedrich Boysen GmbH & Co KG. | Device for introducing and distributing a liquid into a gas flow |
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