CN109681300B - Prevent leading baffle mixing arrangement of urea crystallization - Google Patents
Prevent leading baffle mixing arrangement of urea crystallization Download PDFInfo
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- CN109681300B CN109681300B CN201910148545.XA CN201910148545A CN109681300B CN 109681300 B CN109681300 B CN 109681300B CN 201910148545 A CN201910148545 A CN 201910148545A CN 109681300 B CN109681300 B CN 109681300B
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- exhaust pipe
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- baffle
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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
- F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
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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
- 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
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- 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
Abstract
The invention relates to a preposed baffle mixing device for preventing urea from crystallizing, in particular to a preposed baffle mixing device for preventing urea liquid drops from crystallizing in an exhaust pipe, and belongs to the technical field of selective catalytic reduction in diesel engine exhaust aftertreatment. The device comprises an exhaust pipe, a nozzle seat, a front baffle and a lining porous mixer, wherein the exhaust pipe is internally provided with the front baffle which is positioned at the upstream of the exhaust airflow of the nozzle seat; the arc convex end surface of the front baffle faces the injection position of the urea nozzle, and the arc convex end surface of the front baffle faces back to the air inlet end of the exhaust pipe; and a lining porous mixer is arranged in the exhaust pipe and is positioned at the downstream of the exhaust airflow of the nozzle seat. The invention can effectively reduce the generation of crystalline substances, simultaneously promotes the uniform mixing of diesel engine exhaust and urea liquid drops, improves the conversion efficiency of nitrogen oxides, and is suitable for arrangement and installation in diesel engine test bed and vehicle environments.
Description
Technical Field
The invention relates to a preposed baffle mixing device for preventing urea from crystallizing, in particular to a preposed baffle mixing device for preventing urea liquid drops from crystallizing in an exhaust pipe, and belongs to the technical field of selective catalytic reduction in diesel engine exhaust aftertreatment.
Background
With the increasing environmental problems and the increasing severity of energy crisis and the stricter emission regulations, more and more energy-saving and emission-reducing technologies are applied to diesel engines. The SCR is a technology for purifying nitrogen oxides by injecting a urea solution into an exhaust pipe of a diesel engine and hydrolyzing urea to generate ammonia gas. However, due to the influence of the exhaust temperature of the diesel engine, the liquid film and other factors, the atomized urea sprayed into the exhaust pipe directly collides a large amount of urea droplets onto the inner wall surface of the exhaust pipe under the influence of the high-speed flowing exhaust gas to form crystals, thereby reducing the conversion efficiency of nitrogen oxides and even blocking the exhaust pipe.
The integrated urea nozzle elbow device described in patent CN201220601782.0 is mainly through arranging the urea nozzle seat in the elbow section of blast pipe, and certain angle of biasing in advance compromises the influence of exhaust stream, through the mode of casting back machining, has guaranteed the angle of urea nozzle seat, reduces simultaneously because of the welding slag that the welding produced, reduces the crystallization risk. The structure has fixed installation angle, is easily influenced by exhaust airflow and has poor adaptability. In addition, in the practical use process, due to the limitations of space, layout and the like, the distance between the injection point and the inlet of the catalyst box is short and sharp bends exist, and the flow direction of urea droplets is changed along with the bending of the exhaust pipe due to the bending of the exhaust pipe, for example, in the integrated urea nozzle elbow device described in patent CN201220601782.0, the urea droplets continuously collide with the inner wall surface of the exhaust pipe, and the continuous accumulation of a liquid film of the elbow section and the continuous reduction of the temperature of the inner wall surface are more easily caused. When the liquid film is not completely evaporated, stripped and dropped, crystal deposits are easily formed on the inner wall surface of the exhaust pipe, even if the crystal deposits are serious, the exhaust pipe can be blocked by the crystal deposits, the exhaust back pressure and the oil consumption are increased, and the dynamic property, the economical efficiency and the emission level of the diesel engine are seriously influenced.
Disclosure of Invention
The invention aims to overcome the defects, and provides the preposed baffle mixing device for preventing the urea crystallization.
According to the technical scheme provided by the invention, the preposed baffle mixing device for preventing urea crystallization comprises an exhaust pipe, a nozzle seat, a preposed baffle and a lining porous mixer, wherein the exhaust pipe is provided with the nozzle seat, the nozzle seat is connected with a urea nozzle, and the urea nozzle extends into the exhaust pipe, and is characterized in that: a front baffle is arranged in the exhaust pipe and is positioned at the upstream of the exhaust airflow of the nozzle seat; the cross section of the front baffle is arc-shaped, the arc convex end surface of the front baffle faces the spraying position of the urea nozzle, and the arc convex end surface of the front baffle is back to the air inlet end of the exhaust pipe; the front baffle comprises a neck body part, a middle part and a skirt body part, the neck body part, the middle part and the skirt body part are connected into a whole from front to back, the neck body part of the front baffle is arranged facing the direction of the installation position of the nozzle holder, the front end of the neck body part is tightly attached to the inner wall surface of the exhaust pipe at the upstream of the throat opening of the nozzle holder, the skirt body part of the front baffle is arranged back to the direction of the installation position of the nozzle holder, and a gap is formed between the skirt body part of the front baffle and the pipe wall of the exhaust pipe; the middle part is provided with a middle flow guide structure, the skirt body part is provided with a skirt body flow guide structure, and the flow guide area of the skirt body flow guide structure is larger than that of the middle flow guide structure;
a lining porous mixer is arranged in the exhaust pipe, the lining porous mixer is positioned at the downstream of the exhaust airflow of the nozzle seat, and a gap is formed between the lining porous mixer and the inner wall of the exhaust pipe; the porous blender of inside lining includes interior bushing pipe, and interior bushing pipe middle part surface welding mixed structure, a plurality of spoilers of the downstream end welding of interior bushing pipe, and interior bushing pipe and spoiler surface are equipped with a plurality of mixing holes, and a plurality of mixing holes are along interior bushing pipe and spoiler surface evenly distributed.
Furthermore, an included angle beta is formed between the front baffle and the spraying central line of the urea nozzle, the spraying angle of the urea nozzle on the nozzle seat is alpha, the included angle between the front baffle and the spraying central line of the urea nozzle is beta,
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furthermore, the left side and the right side of the neck body part of the front baffle are symmetrically provided with front installation support plates, the front installation support plates are connected to the inner side wall of the exhaust pipe, the distance between the two front installation support plates on the left side and the right side of the neck body part is larger than the pipe diameter of the throat of the nozzle seat, the left side and the right side of the skirt body part of the front baffle are symmetrically provided with rear installation support plates, and the rear installation support plates are connected to the inner side wall of the exhaust pipe.
Further, the middle flow guiding structure comprises a plurality of middle flow guiding holes which are uniformly distributed.
Furthermore, the skirt diversion structure comprises a plurality of skirt diversion holes which are uniformly distributed
Further, the neck body portion is from the front to back width size grow gradually, and the intermediate portion is from the front to back width size grow gradually.
Furthermore, a plurality of support plates are welded on the surface of the upstream end of the lining pipe, are uniformly distributed along the circumferential direction of the lining pipe, and are connected on the inner side wall of the exhaust pipe.
Further, the lining pipe is of a cylindrical structure.
Further, the mixing structure comprises a plurality of mixing blades which are uniformly distributed along the circumferential direction of the inner lining pipe, and the included angle between the mixing blades and the longitudinal section of the inner lining cylinder in the circumferential direction is an acute angle gamma.
Furthermore, the plurality of spoilers gradually converge from the outer ring to the inner ring, and the plurality of spoilers are uniformly distributed along the circumferential direction of the lining pipe.
Compared with the prior art, the invention has the following advantages:
the invention has simple, compact and reasonable structure, solves the problem of crystallization of the exhaust pipe with sharp bend due to shorter distance between the injection point and the inlet of the catalyst box by combining the front baffle and the lining porous mixer, avoids the collision of the urea solution and the wall surface of the exhaust pipe, continuously disperses the slippage of the liquid film on the wall surface of the liner pipe, has the forced mixing effect due to the design of the lining porous mixer, and further enhances the capability of bending-resistant channel deposition by the turbulence sheet at the tail part; the invention can effectively reduce the generation of crystalline substances, simultaneously promotes the uniform mixing of diesel engine exhaust and urea liquid drops, improves the conversion efficiency of nitrogen oxides, and is suitable for arrangement and installation in diesel engine test bed and vehicle environments.
Drawings
FIG. 1 is a front view of the present invention.
Fig. 2 is a front view of the front baffle.
Fig. 3 is a cross-sectional structural view of the front baffle.
FIG. 4 is a front view of the lined porous mixer.
FIG. 5 is a cross-sectional view of the lined porous mixer.
Description of reference numerals: 1-exhaust pipe, 2-nozzle seat, 3-front baffle, 3.1-neck part, 3.2-middle part, 3.3-skirt part, 3.4-middle diversion hole, 3.5-skirt diversion hole, 3.6-front installation support plate, 3.7-rear installation support plate, 4-lining porous mixer, 4.1-lining pipe, 4.2-mixing blade, 4.3-spoiler, 4.4-mixing hole and 4.5-support plate.
Detailed Description
The invention will be further described with reference to examples in the drawings to which:
as shown in fig. 1, the present invention mainly comprises an exhaust pipe 1, a nozzle holder 2, a front baffle 3, and a lining porous mixer 4. Be equipped with nozzle holder 2 on the blast pipe 1, connect the urea nozzle on the nozzle holder 2, the urea nozzle stretches into in the blast pipe 1 and carries out the urea injection.
A front baffle 3 is arranged in the exhaust pipe 1, and the front baffle 3 is positioned at the upstream of the exhaust airflow of the nozzle seat 2. The spraying angle of the urea nozzle on the nozzle seat 2 is alpha, the included angle between the preposed baffle 3 and the spraying central line of the urea nozzle is beta,
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as shown in fig. 2 to 3, the cross section of the front baffle 3 is circular arc, the circular arc convex end surface of the front baffle 3 faces the injection position of the urea nozzle, and the circular arc convex end surface of the front baffle 3 faces away from the air inlet end of the exhaust pipe. Preferably, the arc radius of the front baffle 3 is 1/4-1/3 times of the pipe diameter D of the exhaust pipe.
Leading baffle 3 includes neck portion 3.1, intermediate part 3.2 and skirt portion 3.3, and neck portion 3.1, intermediate part 3.2 and skirt portion 3.3 link into an organic whole from the front to back end to end.
The neck body part 3.1 of the front baffle 3 is arranged facing the direction of the installation position of the nozzle holder 2, the front end of the neck body part 3.1 is tightly attached to the inner wall surface of the exhaust pipe at the upstream of the throat opening of the nozzle holder 2, the skirt body part 3.3 of the front baffle 3 is arranged back to the direction of the installation position of the nozzle holder 2, and a gap is arranged between the skirt body part 3.3 of the front baffle 3 and the pipe wall of the exhaust pipe 1.
In order to facilitate the installation of the front baffle 3, front installation support plates 3.6 are symmetrically arranged on the left side and the right side of a neck body part 3.1 of the front baffle 3, the front installation support plates 3.6 are connected to the inner side wall of the exhaust pipe 1, and the distance between the two front installation support plates 3.6 on the left side and the right side of the neck body part 3.1 is larger than the pipe diameter of the throat of the nozzle seat 2.
The left side and the right side of the skirt body part 3.3 of the front baffle 3 are symmetrically provided with rear mounting support plates 3.7, and the rear mounting support plates 3.7 are connected on the inner side wall of the exhaust pipe 1. The front and rear mounting plates which are symmetrically arranged can reduce the influence on the exhaust back pressure.
The neck portion 3.1 becomes big gradually from the preceding width size backward, and the width size becomes gradually big from the preceding width size backward of intermediate part 3.2, sets up the cone angle that the structure that the size becomes big gradually with envelope urea spray, prevents that exhaust gas stream from directly blowing. The middle part 3.2 is provided with a middle flow guiding structure which comprises a plurality of middle flow guiding holes 3.4 which are evenly distributed. Skirt body portion 3.3 is equipped with skirt body water conservancy diversion structure, and skirt body water conservancy diversion structure includes a plurality of evenly distributed's skirt body water conservancy diversion hole 3.5. The flow guide area of the skirt body flow guide structure is larger than that of the middle flow guide structure.
The length of the front baffle 3 is L, and preferably, the middle diversion structure is arranged at the position 2/5L of the front baffle 3, and the skirt diversion structure is arranged at the position 2/3L of the front baffle 3.
The front baffle, which is of circular arc configuration, is mounted in the vicinity of the upstream of the urea injection stream in the above-described specific manner. Firstly, the disturbance of the exhaust gas flow is likely to directly affect the urea spray due to the variation of the operating condition of the engine, and the urea spray is directly blown to the inner wall surface of the exhaust pipe. The neck part is tightly attached to the inner wall surface of the exhaust pipe at the upstream of the throat opening of the nozzle seat, so that the damage effect of exhaust airflow on the urea initial spray can be prevented, and the spray dispersion is stabilized. Secondly, when the exhaust airflow blows to the arc concave end face of the baffle plate, the middle upper part of the baffle plate obviously blocks the airflow to blow directly, and strong airflow vortexes are generated on two sides of the baffle plate to guide the exhaust airflow to rapidly break and evaporate urea droplets. The core of the design is as follows: the baffle neck body part is not provided with holes, the middle part of the baffle is sparsely provided with holes, the skirt body part of the baffle is densely provided with row holes to form gradient distribution holes, so that exhaust airflow forms gradient diversion, urea liquid drops are ensured to stably disperse spray beams according to the self spraying characteristics (such as spray cone angle and penetration distance) of the sprayer, and the urea liquid drops are uniformly dispersed in the central area of the exhaust pipe at the downstream. Finally, the exhaust air flow is blown out from the crotch opening of the skirt part of the baffle plate, a gap exists between the lowest part of the baffle plate and the inner wall of the exhaust pipe, and urea liquid drops are prevented from being directly sprayed onto the inner wall surface of the exhaust pipe by utilizing the rapid air flow on the wall surface of the pipe wall.
The design of the front baffle can eliminate the technical requirement of angle installation of the existing nozzle seat, namely the existing spray center line and the central axis of the exhaust pipe form a deflection angle of 3-5 degrees. The design of the invention enables the central line of the urea spray to be consistent with the central axis of the exhaust pipe, the installation requirement of the nozzle seat is simpler, the influence of the change of the working condition of the engine on the urea spray can be obviously reduced, the urea spray is stabilized, the uniform distribution of urea liquid drops in the central area of the exhaust pipe is ensured, and the conversion efficiency is improved.
Be equipped with inside lining porous mixer 4 in the blast pipe 1, inside lining porous mixer 4 is located the exhaust air flow low reaches of nozzle block 2, is equipped with the clearance between inside lining porous mixer 4 and the blast pipe 1 inner wall.
As shown in fig. 4 to 5, the lining porous mixer 4 is made of 4 series ferritic stainless steel materials with high thermal conductivity, and includes a lining pipe 4.1 with a cylindrical structure, the surface of the middle part of the lining pipe 4.1 is welded with a mixed structure, and the length from the mixed structure to the upstream end of the lining pipe 4.1 is 3/5 of the length of the lining pipe 4.1. The mixing structure comprises a plurality of mixing blades 4.2, the plurality of mixing blades 4.2 being evenly distributed along the circumferential direction of the inner lining tube 4.1.
The mixing blades 4.2 in the circumferential direction form an acute angle γ with the cylindrical longitudinal section of the inner jacket 4.1, preferably γ of 30 °.
The downstream end of the lining pipe 4.1 is welded with a plurality of spoilers 4.3, the spoilers 4.3 are gradually folded from the outer ring to the inner ring, the spoilers 4.3 are uniformly distributed along the circumferential direction of the lining pipe 4.1, and the spoilers 4.3 can further prevent liquid drops from colliding with the wall of the exhaust pipe bend and enhance the breaking and evaporation of urea liquid drops.
The surfaces of the lining pipe 4.1 and the spoiler 4.3 are provided with a plurality of mixing holes 4.4, the mixing holes 4.1 are uniformly distributed along the surfaces of the lining pipe 4.1 and the spoiler 4.3, and the mixing holes 4.4 can prevent liquid drops from attaching and depositing on the spoiler.
The upstream end surface of the lining pipe 4.1 is welded with a plurality of support plates 4.5, and the support plates 4.5 are evenly distributed along the circumferential direction of the lining pipe 4.1. A plurality of backup pads 4.5 are connected on the inside wall of blast pipe 1, play the effect of stabilizing the support.
The lined perforated mixer is designed in the straight section of the exhaust pipe downstream of the nozzle holder. First, the diameter of the liner tube is smaller than the inner diameter of the exhaust pipe, thereby forming a liner form, and when urea droplets blown upstream in the direction of the baffle reach the upstream port of the liner tube, the liner tube plays a role of receiving by a funnel. Secondly, when urea liquid drops are sprayed on the inner wall of the mixer, exhaust airflow sweeps the wall surface of the lining from the opening of the peripheral wall of the lining pipe, so that the urea liquid drops are continuously scattered to prevent the aggregation of a liquid film and accelerate the evaporation of residual urea liquid drops; and finally, the urea liquid drops are forcibly mixed by the downstream blades, so that the incompletely evaporated urea liquid drops collide with the blades for sputtering, evaporation and pyrolysis are accelerated, the spoiler at the tail end of the mixing pipe plays a role in guiding airflow, and the crystallization of the inner wall surface of the urea liquid drops at the elbow at the bottom end of the exhaust pipe can be adaptively avoided.
The invention is also particularly applicable to situations where there is no sharp turn downstream of the injection location. The inner lining porous mixer is provided with the spoiler at the tail end to continuously guide the airflow, further prevent liquid drops from colliding with the wall of the exhaust pipe bend and enhance the crushing and evaporation of the urea liquid drops.
In conclusion, the invention solves the problem of crystallization of the sharply bent exhaust pipe due to short distance between the injection point and the inlet of the catalyst box by the combined use of the front baffle and the lining porous mixer, avoids the collision of the urea solution and the wall surface of the exhaust pipe, ensures that the slippage of the liquid film on the wall surface of the lining pipe is continuously dispersed, has the forced mixing effect due to the design of the lining porous mixer, and further enhances the capability of resisting the deposition of a bent channel by the spoiler at the tail part. The device can effectively reduce the generation of crystalline substances, promotes the uniform mixing of diesel engine exhaust and urea liquid drops, improves the conversion efficiency of nitrogen oxides, and is suitable for arrangement and installation under the environment of a diesel engine test bed and a finished automobile.
Claims (10)
1. The utility model provides a prevent leading baffle mixing arrangement of urea crystallization, includes blast pipe (1), nozzle holder (2), leading baffle (3) and inside lining porous mixer (4), is equipped with nozzle holder (2) on blast pipe (1), connects the urea nozzle on nozzle holder (2), and the urea nozzle stretches into in blast pipe (1), characterized by: a front baffle (3) is arranged in the exhaust pipe (1), and the front baffle (3) is positioned at the upstream of the exhaust airflow of the nozzle seat (2); the cross section of the front baffle (3) is arc-shaped, the arc concave end surface of the front baffle (3) faces the injection position of the urea nozzle, and the arc convex end surface of the front baffle (3) faces the air inlet end of the exhaust pipe; the front baffle (3) comprises a neck part (3.1), an intermediate part (3.2) and a skirt part (3.3), the neck part (3.1), the intermediate part (3.2) and the skirt part (3.3) are connected into a whole from front to back, the neck part (3.1) of the front baffle (3) is arranged in the direction facing the installation position of the nozzle seat (2), the front end of the neck part (3.1) is tightly attached to the inner wall surface of the exhaust pipe at the upstream of the throat opening of the nozzle seat (2), the skirt part (3.3) of the front baffle (3) is arranged in the direction facing the installation position of the nozzle seat (2), and a gap is arranged between the skirt part (3.3) of the front baffle (3) and the pipe wall of the exhaust pipe (1); the middle part (3.2) is provided with a middle flow guide structure, the skirt body part (3.3) is provided with a skirt body flow guide structure, and the flow guide area of the skirt body flow guide structure is larger than that of the middle flow guide structure;
a lining porous mixer (4) is arranged in the exhaust pipe (1), the lining porous mixer (4) is positioned at the downstream of the exhaust airflow of the nozzle seat (2), and a gap is formed between the lining porous mixer (4) and the inner wall of the exhaust pipe (1); the porous blender of inside lining includes interior bushing pipe (4.1), and interior bushing pipe (4.1) middle part surface welding mixed structure, a plurality of spoilers (4.3) of the downstream end welding of interior bushing pipe (4.1), and interior bushing pipe (4.1) and spoilers (4.3) surface are equipped with a plurality of mixing holes (4.4), and a plurality of mixing holes (4.1) are along interior bushing pipe (4.1) and spoilers (4.3) surface evenly distributed.
2. The pre-baffled mixing apparatus for preventing urea crystallization as recited in claim 1, wherein: the preposed baffle (3) and the spraying center line of the urea nozzle form an included angle beta, the spraying angle of the urea nozzle on the nozzle seat (2) is alpha, the included angle between the preposed baffle (3) and the spraying center line of the urea nozzle is beta,
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3. the pre-baffled mixing apparatus for preventing urea crystallization as recited in claim 1, wherein: the novel exhaust pipe is characterized in that front mounting support plates (3.6) are symmetrically arranged on the left and right sides of a neck body portion (3.1) of the front baffle (3), the front mounting support plates (3.6) are connected to the inner side wall of the exhaust pipe (1), the distance between the two front mounting support plates (3.6) on the left and right sides of the neck body portion (3.1) is larger than the pipe diameter of a throat of the nozzle seat (2), rear mounting support plates (3.7) are symmetrically arranged on the left and right sides of a skirt body portion (3.3) of the front baffle (3), and the rear mounting support plates (3.7) are connected to the inner side wall of the exhaust.
4. The pre-baffled mixing apparatus for preventing urea crystallization as recited in claim 1, wherein: the intermediate flow guiding structure comprises a plurality of intermediate flow guiding holes (3.4) which are uniformly distributed.
5. The pre-baffled mixing apparatus for preventing urea crystallization as recited in claim 1, wherein: the skirt diversion structure comprises a plurality of skirt diversion holes (3.5) which are uniformly distributed.
6. The pre-baffled mixing apparatus for preventing urea crystallization as recited in claim 1, wherein: the neck body part (3.1) is gradually enlarged from the front to the back in width, and the middle part (3.2) is gradually enlarged from the front to the back in width.
7. The pre-baffled mixing apparatus for preventing urea crystallization as recited in claim 1, wherein: the surface of the upstream end of the lining pipe (4.1) is welded with a plurality of supporting plates (4.5), the supporting plates (4.5) are uniformly distributed along the circumferential direction of the lining pipe (4.1), and the supporting plates (4.5) are connected on the inner side wall of the exhaust pipe (1).
8. The pre-baffled mixing apparatus for preventing urea crystallization as recited in claim 1, wherein: the lining pipe (4.1) is of a cylindrical structure.
9. The pre-baffled mixing apparatus for preventing urea crystallization as recited in claim 1, wherein: the mixing structure comprises a plurality of mixing blades (4.2), the mixing blades (4.2) are uniformly distributed along the circumferential direction of the inner lining pipe (4.1), and an included angle formed between the mixing blades (4.2) and the cylindrical longitudinal section of the inner lining (4.1) in the circumferential direction is an acute angle gamma.
10. The pre-baffled mixing apparatus for preventing urea crystallization as recited in claim 1, wherein: the spoiler pieces (4.3) are gradually gathered from the outer ring to the inner ring, and the spoiler pieces (4.3) are uniformly distributed along the circumferential direction of the lining pipe (4.1).
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| CN201910148545.XA CN109681300B (en) | 2019-02-28 | 2019-02-28 | Prevent leading baffle mixing arrangement of urea crystallization |
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| CN201910148545.XA CN109681300B (en) | 2019-02-28 | 2019-02-28 | Prevent leading baffle mixing arrangement of urea crystallization |
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| CN113685251A (en) * | 2021-09-27 | 2021-11-23 | 无锡威孚力达催化净化器有限责任公司 | SCR tight coupling mixer |
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| US7581387B2 (en) * | 2005-02-28 | 2009-09-01 | Caterpillar Inc. | Exhaust gas mixing system |
| ITMI20050651A1 (en) * | 2005-04-15 | 2006-10-16 | Iveco Spa | MODULE AND METHOD OF INTRUSION OF A UREA SOLUTION IN THE UNLOADING GAS OF AN ENGINE |
| CN201899904U (en) * | 2010-12-20 | 2011-07-20 | 重庆建峰工业集团有限公司 | Structure of deflection baffle of vacuum separator for urea production |
| CN202937335U (en) * | 2012-11-15 | 2013-05-15 | 中国第一汽车股份有限公司 | Pipe bending device integrated with urea nozzle holder |
| SE539138C2 (en) * | 2013-10-07 | 2017-04-18 | Scania Cv Ab | Arrangement for introducing a liquid medium into exhaust gases from an internal combustion engine |
| CN205714375U (en) * | 2016-06-23 | 2016-11-23 | 四川帝华汽车科技股份有限公司 | Blender for diesel car SCR SCR system |
| JP2018040336A (en) * | 2016-09-09 | 2018-03-15 | 三菱自動車工業株式会社 | Exhaust emission control device for engine |
| CN208089388U (en) * | 2018-04-24 | 2018-11-13 | 江铃汽车股份有限公司 | A kind of injection of exhaust aftertreatment urea and mixed structure |
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|---|---|
| CN109681300A (en) | 2019-04-26 |
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