CN114483263B - Mixer for exhaust aftertreatment system - Google Patents
Mixer for exhaust aftertreatment system Download PDFInfo
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- CN114483263B CN114483263B CN202210037778.4A CN202210037778A CN114483263B CN 114483263 B CN114483263 B CN 114483263B CN 202210037778 A CN202210037778 A CN 202210037778A CN 114483263 B CN114483263 B CN 114483263B
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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
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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
- F01N2570/00—Exhaust treating apparatus eliminating, absorbing or adsorbing specific elements or compounds
- F01N2570/14—Nitrogen oxides
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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
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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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
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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
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
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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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- 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)
- Cyclones (AREA)
Abstract
The invention provides a mixer for an exhaust aftertreatment system, which comprises a swirl tube, blades, a baffle plate and a mixed flow plate; the cyclone tube can enable a first part of exhaust gas flow to flow into the cyclone tube and be primarily mixed with the mixed urea solution; the inlet ends of the blades are communicated with the outlet ends of the cyclone tubes and are used for crushing the mixed exhaust gas flow; the baffle is connected with the blades and can guide the exhaust air flow at the inlet ends of the blades to the outlet ends of the blades; the partition plate is connected between the blades and the baffle plate and used for allowing the second part of exhaust air flow to enter the blades; the mixing flow plate is communicated with the outlet end of the blade and is used for mixing the exhaust gas flow and the urea solution again; a plurality of openings with the same rotation direction are uniformly formed in the peripheral surface of the swirl tube; and an air inlet groove is formed in the partition plate and used for blowing the second part of exhaust air flow to the surface of the baffle plate. This application exhaust air current divides two parts to get into, guarantees urea intensive mixing and under broken prerequisite, reduces the risk of urea crystallization, uses safelyr.
Description
Technical Field
The invention relates to the technical field of exhaust gas aftertreatment, in particular to a mixer for an exhaust gas aftertreatment system.
Background
The technical principle of SCR is that NH3 generated by high-temperature decomposition of urea aqueous solution reacts with NOx to generate N2 under the action of a catalyst, so that NOx in exhaust gas is reduced, and the emission standard of China six is met.
Typically, the mixer is arranged before the SCR and the exhaust gases are discharged to the atmosphere after passing the DOC, the DPF, the mixer, the SCR.
The main function of the mixer is to crush the urea aqueous solution to form smaller urea particles, and uniformly mix the exhaust gas and the urea particles; the gas flow uniformity is improved, NH3 formed by pyrolysis is uniformly brought to the end face of the SCR carrier, the conversion efficiency of SCR is improved, therefore, the method is focused on how to crush and form smaller urea particles to reduce crystallization risks, how to avoid blockage caused by crystallization accumulation, and how to improve the flow uniformity and the conversion efficiency.
At present, only one air inlet of the mixer is arranged, all exhaust enters the mixer from the same inlet, and then is conveyed or crushed for a plurality of times, so that in order to reduce the risk of urea crystallization on the baffle plate, other paths can be designed to guide the exhaust to blow the exhaust to the baffle plate again, the complexity of the structure is increased, and therefore, the mixer with a simple exhaust structure is required to solve the problem of urea crystallization, and urea solution and exhaust can be fully mixed.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides the mixer for the exhaust aftertreatment system, which is used for realizing two-part air intake, simplifying the structure of the mixer, ensuring the exhaust mixing efficiency and the crushing efficiency and reducing the risk of urea crystallization at the same time through crushing and mixing the exhaust and urea solution twice. The technical scheme adopted by the invention is as follows:
a mixer for an exhaust aftertreatment system, comprising
The cyclone tube can enable a first part of exhaust gas flow to flow into the cyclone tube and be primarily mixed with the mixed urea solution;
the inlet end of the blade is communicated with the outlet end of the cyclone tube and is used for crushing the mixed exhaust gas flow;
the baffle plate is connected with the blades and can guide the exhaust air flow at the inlet ends of the blades to the outlet ends of the blades;
the baffle plate is connected between the blade and the baffle plate and used for allowing the second part of exhaust air flow to enter the blade; and
the mixed flow plate is communicated with the outlet end of the blade and is used for mixing the exhaust gas flow and the urea solution again to improve the flow uniformity of the mixed gas;
wherein, the liquid crystal display device comprises a liquid crystal display device,
a plurality of openings with the same rotation direction are uniformly formed in the peripheral surface of the swirl tube;
and an air inlet groove is formed in the partition plate and used for blowing the second part of exhaust air flow to the surface of the baffle plate.
Further, the first part of the exhaust gas flow entering the cyclone tube accounts for 85% -94% of the total exhaust gas flow, and the second part of the exhaust gas flow entering the air inlet groove accounts for 6% -15% of the total exhaust gas flow.
Further, the device also comprises a cylinder body, wherein the swirl tube, the blades, the baffle plates and the mixed flow plates are all arranged in the cylinder body;
the swirl tube, the blades and the baffle plates are sequentially arranged along the radial direction of the cylinder body; the mixing plate is arranged at the downstream of the cyclone tube.
Further, a flow blocking plate is arranged in the cylinder body and is positioned between the swirl tube and the mixing plate and used for blocking the first part of exhaust gas flow, so that the first part of exhaust gas flow can only flow into the swirl tube.
Further, a bridging tube is arranged between the cyclone tube and the blades, one axial end of the bridging tube is abutted to the outlet end of the cyclone tube, and the other axial end of the bridging tube is abutted to the partition plate.
Further, one end of the spoiler, which is close to the blade, is semi-wrapped on the bridging tube, a first lap joint part is arranged on the spoiler, a second lap joint part is arranged on the baffle plate, the second lap joint part is abutted to the peripheral surface of the bridging tube, and the second lap joint part is carried on the first lap joint part.
Further, the blade comprises an air inlet panel and an air outlet panel;
one end of the air inlet panel is connected with the air outlet panel; the air inlet panel is parallel to the radial section of the cyclone tube, and the other end of the air outlet panel extends to the inner wall of the cylinder;
the air inlet panel is provided with a plurality of groups of first fins with different opening directions for crushing the exhaust air flow after primary mixing;
and a plurality of groups of second fins with different opening directions are arranged on the air outlet panel and are used for crushing the exhaust air flow after primary mixing and the second part of exhaust air flow.
Further, a first inserting piece is arranged at one end, far away from the air outlet panel, of the air inlet panel, a first inserting groove is formed in the partition board, and the first inserting piece can be inserted into the first inserting groove so as to realize connection between the air inlet panel and the partition board; and/or the number of the groups of groups,
the baffle is provided with a first inserting piece, the baffle is provided with a first inserting groove, and the first inserting piece can be inserted into the first inserting groove to realize connection between the baffle and the baffle.
Further, an air outlet groove is formed in one end, close to the cylinder, of the air outlet panel, a first extending piece is arranged at one end, far away from the partition plate, of the baffle plate, and the first extending piece penetrates through the air outlet groove and is obliquely arranged towards the air inlet panel; and/or
The baffle plates are respectively provided with second extension plates along the radial two ends of the cylinder body, the second extension plates are obliquely arranged towards the swirl tube, and the end parts of the second extension plates are abutted to the inner wall of the cylinder body.
Further, the cylinder is radially provided with a positioning hole, a reinforcing patch is arranged in the positioning hole, one end of the reinforcing patch is connected to one axial end of the cyclone tube, the other end of the reinforcing patch is provided with a base, the base is provided with a nozzle, and the nozzle is used for spraying urea solution into the cyclone tube.
The invention has the advantages that:
1. according to the invention, the exhaust gas flow enters the mixer from two positions of the cyclone tube and the baffle plate respectively, the first part of the exhaust gas flow is mixed with urea solution through the cyclone tube and then is primarily broken through the blades, urea crystallization on the baffle plate is easy to be caused when the primarily broken exhaust gas flow directly blows the baffle plate, so that the primarily broken exhaust gas flow of the directly blown baffle plate is blown away by the second part of the exhaust gas flow entering from the air inlet groove of the baffle plate, the crystallization risk is avoided, the aim of secondary mixing is achieved, and the exhaust gas flow discharged from the blades is mixed again when passing through the mixing plate, so that the flow speed uniformity of the mixed gas is improved;
2. the flow ratio between the first part of exhaust gas flow entering from the cyclone tube and the second part of exhaust gas flow entering from the baffle plate is adjusted, so that the urea solution and the exhaust gas flow are fully mixed and crushed, and meanwhile, the urea is prevented from crystallizing on the baffle plate, and the influence on the exhaust gas flow mixing effect and crushing effect caused by insufficient mixing of the second part of exhaust gas flow which does not pass through the cyclone tube is avoided;
3. the flow blocking plate and the baffle plate fix the position of the bridging tube, and meanwhile, the flow blocking plate is overlapped with the bridging tube, so that the efficiency of the whole mixer in assembly is improved to a certain extent, and the connection stability of the bridging tube is ensured; through changing the bridging pipe of different length, match the barrel of different diameters, enlarge application scope, also make things convenient for the change of each half of blender.
Drawings
Fig. 1 is an exploded view of the present invention.
Fig. 2 is an assembly view of the present invention.
Fig. 3 is a structural view of the separator of the present invention.
Fig. 4 is a structural view of the vane of the present invention.
Fig. 5 is a structural view of the flap of the present invention.
In the figure: 1-swirl tube, 2-blade, 3-baffle, 4-baffle, 5-mixed flow plate, 6-cylinder, 7-baffle, 8-bridging tube, 9-reinforcing patch, 10-base, 11-nozzle, 101-opening, 201-air inlet panel, 2011-first fin, 2012-first insert sheet, 202-air outlet panel, 2021-second fin, 2022-air outlet groove, 301-second insert sheet, 302-first extension sheet, 303-second extension sheet, 401-air inlet groove, 402-second overlap, 403-first insert groove, 404-second insert groove, 601-locating hole, 701-first overlap.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 1-2, the present invention provides a mixer for an exhaust gas aftertreatment system, comprising a swirl tube 1, a vane 2, a baffle 3, a baffle plate 4, a mixing plate 5, and a cylinder 6; the cyclone tube 1, the blades 2, the baffle 3, the baffle 4 and the mixed flow plate 5 are all arranged in the cylinder 6; the cyclone tube 1, the blades 2 and the baffle 3 are sequentially arranged along the radial direction of the cylinder 6; the mixing plate 5 is arranged downstream of the swirl tube 1.
The cyclone tube 1 can enable a first part of exhaust gas flow to flow into the cyclone tube 1 and be primarily mixed with the mixed urea solution; a plurality of openings 101 with the same rotation direction are uniformly formed in the peripheral surface of the cyclone tube 1; in this embodiment, the opening 101 is an inlet end of the cyclone tube 1, one end of the cyclone tube 1, which is close to the axial direction of the blade 2, is an outlet end of the cyclone tube 1, and the opening 101 realizes that a first part of exhaust airflow spirally enters the cyclone tube 1 from the circumferential direction of the cyclone tube 1; the exhaust airflow spirally enters the cyclone tube 1, so that the mixing efficiency of the exhaust airflow and urea solution can be improved;
the inlet ends of the blades 2 are communicated with the outlet end of the cyclone tube 1 and are used for crushing the mixed exhaust gas flow; the baffle 3 is connected with the blades 2 and can guide the exhaust gas flow at the inlet end of the blades 2 to the outlet end of the blades 2; the baffle 3 plays a role of separating and blocking, so that exhaust air flow is prevented from directly blowing the cylinder 6, and urea crystallization is prevented from being generated on the cylinder 6;
the partition plate 4 is connected between the blade 2 and the baffle plate 3, so that a second part of exhaust gas flow enters the blade 2; an air inlet groove 401 is formed in the partition plate 4, and the air inlet groove 401 is used for blowing a second part of exhaust air flow to the surface of the baffle plate 3; the exhaust gas flow passes through the blades 2 in two parts respectively, and the two parts of exhaust gas flow are crushed again from the outlet ends of the blades 2, so that the crushing effect of urea particles is ensured;
the mixed flow plate 5 is communicated with the outlet end of the blade 2 and is used for mixing the exhaust gas flow and the urea solution again to improve the flow uniformity of the mixed gas; the structure of the mixing plate 5 is already disclosed in the prior art and will not be described here in detail.
In the present application, in order to achieve the purposes of blowing off the urea solution, avoiding urea crystallization, and fully mixing the exhaust gas flow with the urea solution, the first part of the exhaust gas flow entering the cyclone tube 1 accounts for 85% -94% of the total exhaust gas flow, and the second part of the exhaust gas flow entering the air inlet groove 401 accounts for 6% -15% of the total exhaust gas flow; optionally, the first part of the exhaust gas flow entering the cyclone tube 1 accounts for 88% -92% of the total exhaust gas flow, and the second part of the exhaust gas flow entering the air inlet groove 401 accounts for 8% -12% of the total exhaust gas flow; optionally, the first part of the exhaust gas flow entering the cyclone tube 1 accounts for 89% -91% of the total exhaust gas flow, and the second part of the exhaust gas flow entering the air inlet groove 401 accounts for 9% -11% of the total exhaust gas flow; optionally, the first part of the exhaust gas flow entering the cyclone tube 1 accounts for 89.6% -90.7% of the total exhaust gas flow, and the second part of the exhaust gas flow entering the air inlet groove 401 accounts for 9.3% -10.4% of the total exhaust gas flow; the flow ratio of the first part of exhaust gas flow to the second part of exhaust gas flow is controlled by controlling the size of the opening 101 and the size of the air inlet groove 401, so that the use requirement of the mixer is met.
In order to avoid that the first part of exhaust gas flow is not mixed and crushed and directly contacts the mixed flow plate 5, a flow blocking plate 7 is arranged in the cylinder 6, and the flow blocking plate 7 is positioned between the swirl tube 1 and the mixed flow plate 5 and is used for blocking the first part of exhaust gas flow, so that the first part of exhaust gas flow can only flow into the swirl tube 1; in this embodiment, the top and front and rear ends of the spoiler 7 are abutted against the cylinder 6, so as to improve the shielding effect of the exhaust air flow.
Referring to fig. 1-3, in order to realize the transitional connection between the cyclone tube 1 and the partition plate 4 and adapt to the cylinders 6 with different diameters, a bridging tube 8 is arranged between the cyclone tube 1 and the blades 2, one axial end of the bridging tube 8 is abutted to the outlet end of the cyclone tube 1, and the other axial end of the bridging tube 8 is abutted to the partition plate 4; in this application for better butt joint baffle 4 and bridging pipe 8, set up the arc border with bridging pipe 8 butt at baffle 4 top, the centre of a circle of arc border place circle is located bridging pipe 8's axis.
In order to further improve the installation and positioning of the baffle plate 4, the flow blocking plate 7 and the bridging tube 8 and reduce the occupied space, one end of the flow blocking plate 7, which is close to the blade 2, is half-wrapped on the bridging tube 8; further preventing the first portion of the exhaust gas flow from passing directly through the mixing plate 5;
further, the spoiler 7 is provided with a first lap joint part 701, the separator 4 is provided with a second lap joint part 402, the second lap joint part 402 is abutted against the peripheral surface of the bridge pipe 8, and the second lap joint part 402 is mounted on the first lap joint part 701; when in use, the baffle plate 4 is directly carried on the flow blocking plate 7, so that the bridging tube 8 can be positioned, the operation is more convenient, and the path of the exhaust gas flow in the radial direction is reduced.
Referring to fig. 1 and 4, in the present application, the blade 2 includes an air inlet panel 201 and an air outlet panel 202; the inlet panel 201 is the inlet end of the blade 2, and the outlet panel 202 is the outlet end of the blade 2;
one end of the air inlet panel 201 is connected to the air outlet panel 202; the air inlet panel 201 is parallel to the radial section of the cyclone tube 1, and the other end of the air outlet panel 202 extends to the inner wall of the cylinder 6; the butt joint area of the air inlet panel 201 and the cyclone tube 1 is large, the urea stacking space is large, and the crushing effect is better; a plurality of groups of first fins 2011 with different opening directions are arranged on the air inlet panel 201 and used for crushing the exhaust air flow after primary mixing; the air outlet panel 202 is provided with a plurality of groups of second fins 2021 with different opening directions, which are used for crushing the first mixed exhaust air flow and the second part of exhaust air flow.
Referring to fig. 3 and 4, a first insertion piece 2012 is disposed at an end of the air inlet panel 201 away from the air outlet panel 202, and a first slot 403 is disposed on the partition board 4, and the first insertion piece 2012 can be inserted into the first slot 403 to connect the air inlet panel 201 with the partition board 4; thereby facilitating the mounting and positioning of the blade 2 and reducing the overall occupation space.
Referring to fig. 3 and 5, the baffle 3 is provided with a second insertion piece 301, the partition board 4 is provided with a second slot 404, and the second insertion piece 301 can be inserted into the second slot 404 to connect the baffle 3 with the partition board 4; thereby facilitating the mounting and positioning of the flap 3 and reducing the overall occupation space.
Referring to fig. 1, 4 and 5, an air outlet groove 2022 is formed at an end of the air outlet panel 202 close to the cylinder 6, a first extension piece 302 is formed at an end of the baffle 3 far away from the partition board 4, and the first extension piece 302 penetrates through the air outlet groove 2022 and is obliquely arranged towards the air inlet panel 201; the air outlet grooves 2022 provide air outlet space, and the first extending piece 302 plays a role of guiding so that the mixed gas is not concentrated at the bottom of the cylinder 6, and uniformity of the exhaust gas flow is improved.
Referring to fig. 1 and 5, the baffle 3 is provided with second extending pieces 303 along two radial ends of the cylinder 6, the second extending pieces 303 are obliquely arranged towards the swirl tube 1, and the ends of the second extending pieces 303 are abutted against the inner wall of the cylinder 6; the exhaust gas flow is restricted from flowing only from the second fin 2021 and the gas outlet groove 2022 to the mixed flow plate 5 by providing the second extension piece 303.
In order to facilitate the spraying of urea solution, a positioning hole 601 is radially formed in the cylinder 6, a reinforcing patch 9 is arranged in the positioning hole 601, one end of the reinforcing patch 9 is connected to one axial end of the cyclone tube 1, the other end of the reinforcing patch 9 is provided with a base 10, a nozzle 11 is arranged on the base 10, and the nozzle 11 is used for spraying urea solution into the cyclone tube 1; the reinforcing patch 9 acts as a seal to prevent leakage of exhaust air flow from the locating hole 601.
Mixing:
the first part of exhaust gas flow enters the cyclone tube 1 after cyclone flow through the opening 101, is mixed with urea solution sprayed by the nozzle 11, and after passing through the bridging tube 8, the mixed exhaust gas flow is primarily crushed by the first fins 2011 on the blade 2 and then blown to the surface of the baffle 3, the second part of exhaust gas flow is blown to the surface of the baffle 3 through the air inlet groove 401, urea solution on the surface of the baffle 3 is blown away, urea solution crystallization is prevented, and the mixed gas is mixed with the part of mixed gas, the mixed exhaust gas flow is crushed again by the second fins 2021, part of exhaust gas flow flows out of the air outlet groove 2022, and the two parts of exhaust gas flows are mixed and then flow through the mixed flow plate 5, so that the flow uniformity of the exhaust gas flow is improved; the exhaust gas flow mixed by the mixer uniformly passes through the end face of the SCR carrier, thereby being beneficial to improving the catalytic reduction effect of the SCR.
To sum up, this application dual whirl promotes ammonia and mixes the homogeneity, and exhaust air flow gets into from two positions, utilizes two part flow to compare and avoids urea crystallization when guaranteeing the ammonia effect of mixing, and blade 2 and swirl tube 1's butt joint area is big, and urea can pile up the space big, and crushing effect is better.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same, 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 and equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all such modifications and equivalents are intended to be encompassed in the scope of the claims of the present invention.
Claims (5)
1. A mixer for an exhaust aftertreatment system, characterized by: comprising
The cyclone tube (1), the cyclone tube (1) can make the first part of exhaust gas flow into the cyclone tube (1) and mix with the mixed urea solution for the first time, a plurality of openings (101) with the same rotation direction are uniformly arranged on the peripheral surface of the cyclone tube (1);
the blade (2), the inlet end of the blade (2) is communicated with the outlet end of the cyclone tube (1) and is used for crushing the mixed exhaust gas flow, the blade (2) comprises an air inlet panel (201) and an air outlet panel (202), a plurality of groups of first fins (2011) with different opening directions are arranged on the air inlet panel (201) and are used for crushing the primarily mixed exhaust gas flow, and a plurality of groups of second fins (2021) with different opening directions are arranged on the air outlet panel (202) and are used for crushing the primarily mixed exhaust gas flow and the second part of exhaust gas flow;
the baffle plate (3) is connected with the blades (2) and can guide the exhaust air flow at the inlet ends of the blades (2) to the outlet ends of the blades (2);
the baffle plate (4) is connected between the blade (2) and the baffle plate (3) and used for allowing a second part of exhaust gas flow to enter the blade (2), an air inlet groove (401) is formed in the baffle plate (4), the air inlet groove (401) is used for allowing the second part of exhaust gas flow to blow to the surface of the baffle plate (3), the first part of exhaust gas flow entering the cyclone tube (1) accounts for 85% -94% of the total exhaust gas flow, and the second part of exhaust gas flow entering the air inlet groove (401) accounts for 6% -15% of the total exhaust gas flow;
the mixed flow plate (5) is communicated with the outlet end of the blade (2) and is used for mixing the exhaust gas flow and the urea solution again to improve the flow uniformity of the mixed gas;
the cyclone tube (1), the blades (2), the baffle plates (3), the baffle plates (4) and the mixed flow plate (5) are all arranged in the cylinder (6); the cyclone tube (1), the blades (2) and the baffle (3) are sequentially arranged along the radial direction of the cylinder body (6); the flow mixing plate (5) is arranged at the downstream of the cyclone tube (1);
a flow blocking plate (7) is arranged in the cylinder (6), and the flow blocking plate (7) is positioned between the swirl tube (1) and the mixed flow plate (5) and is used for blocking a first part of exhaust gas flow so that the first part of exhaust gas flow can only flow into the swirl tube (1); a bridging pipe (8) is arranged between the cyclone tube (1) and the blades (2), one axial end of the bridging pipe (8) is abutted to the outlet end of the cyclone tube (1), and the other axial end of the bridging pipe (8) is abutted to the partition plate (4); one end of each spoiler (7) close to each blade (2) is semi-wrapped on the corresponding bridging tube (8), a first lap joint part (701) is arranged on each spoiler (7), a second lap joint part (402) is arranged on each partition plate (4), the second lap joint parts (402) are abutted to the peripheral surface of the corresponding bridging tube (8), and the second lap joint parts (402) are carried on the first lap joint parts (701).
2. The mixer for an exhaust aftertreatment system of claim 1, wherein: one end of the air inlet panel (201) is connected with the air outlet panel (202); the air inlet panel (201) is parallel to the radial section of the cyclone tube (1), and the other end of the air outlet panel (202) extends to the inner wall of the cylinder (6).
3. The mixer for an exhaust aftertreatment system of claim 2, wherein: one end of the air inlet panel (201) far away from the air outlet panel (202) is provided with a first inserting piece (2012), the partition board (4) is provided with a first inserting groove (403), and the first inserting piece (2012) can be inserted into the first inserting groove (403) so as to realize the connection between the air inlet panel (201) and the partition board (4); and/or the number of the groups of groups,
be equipped with second inserted sheet (301) on separation blade (3), be equipped with second slot (404) on baffle (4), second inserted sheet (301) can insert in second slot (404) to realize the connection of separation blade (3) and baffle (4).
4. A mixer for an exhaust aftertreatment system according to claim 3, characterized in that: an air outlet groove (2022) is formed in one end, close to the cylinder body (6), of the air outlet panel (202), a first extension piece (302) is arranged at one end, far away from the partition plate (4), of the baffle plate (3), and the first extension piece (302) penetrates through the air outlet groove (2022) and is obliquely arranged towards the air inlet panel (201); and/or
The baffle plates (3) are respectively provided with second extension plates (303) along the two radial ends of the cylinder body (6), the second extension plates (303) are obliquely arranged towards the swirl tube (1), and the end parts of the second extension plates (303) are abutted to the inner wall of the cylinder body (6).
5. The mixer for an exhaust aftertreatment system of claim 2, wherein: the utility model discloses a urea injection device, including barrel (6), barrel, nozzle (11) are provided with locating hole (601) radially on barrel (6), be provided with in locating hole (601) and strengthen patch (9), the one end of strengthening patch (9) is connected in the axial one end of swirl tube (1), the other end of strengthening patch (9) is provided with base (10), be provided with nozzle (11) on base (10), nozzle (11) are used for to the internal injection urea solution of swirl tube (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202210037778.4A CN114483263B (en) | 2022-01-13 | 2022-01-13 | Mixer for exhaust aftertreatment system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210037778.4A CN114483263B (en) | 2022-01-13 | 2022-01-13 | Mixer for exhaust aftertreatment system |
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| CN114483263A CN114483263A (en) | 2022-05-13 |
| CN114483263B true CN114483263B (en) | 2023-08-04 |
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| CN108119211A (en) * | 2017-12-23 | 2018-06-05 | 无锡威孚力达催化净化器有限责任公司 | A kind of close-coupled mixing arrangement for meeting six discharge standard of Europe |
| CN110439659A (en) * | 2019-09-12 | 2019-11-12 | 无锡威孚力达催化净化器有限责任公司 | Nozzle integrated form SCR post-processes urea mixing device |
| WO2019239429A1 (en) * | 2018-06-11 | 2019-12-19 | Ecocat India Pvt. Ltd. | A mixer assembly and an exhaust after treatment system having the mixer assembly |
| CN110725733A (en) * | 2019-11-28 | 2020-01-24 | 广西玉柴机器股份有限公司 | Urea mixer of engine |
| CN111927603A (en) * | 2020-08-19 | 2020-11-13 | 无锡威孚力达催化净化器有限责任公司 | Barrel type transverse post-treatment urea mixing device |
| CN113586212A (en) * | 2021-09-15 | 2021-11-02 | 无锡威孚力达催化净化器有限责任公司 | Mixing device with multi-cyclone structure |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9217353B2 (en) * | 2013-04-03 | 2015-12-22 | Caterpillar Inc. | Mixer for fluid injection system |
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2022
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108119211A (en) * | 2017-12-23 | 2018-06-05 | 无锡威孚力达催化净化器有限责任公司 | A kind of close-coupled mixing arrangement for meeting six discharge standard of Europe |
| WO2019239429A1 (en) * | 2018-06-11 | 2019-12-19 | Ecocat India Pvt. Ltd. | A mixer assembly and an exhaust after treatment system having the mixer assembly |
| CN110439659A (en) * | 2019-09-12 | 2019-11-12 | 无锡威孚力达催化净化器有限责任公司 | Nozzle integrated form SCR post-processes urea mixing device |
| CN110725733A (en) * | 2019-11-28 | 2020-01-24 | 广西玉柴机器股份有限公司 | Urea mixer of engine |
| CN111927603A (en) * | 2020-08-19 | 2020-11-13 | 无锡威孚力达催化净化器有限责任公司 | Barrel type transverse post-treatment urea mixing device |
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| CN114483263A (en) | 2022-05-13 |
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