CN112196645B - Cylindrical cone pipe cyclone mixer - Google Patents
Cylindrical cone pipe cyclone mixer Download PDFInfo
- Publication number
- CN112196645B CN112196645B CN202011164561.7A CN202011164561A CN112196645B CN 112196645 B CN112196645 B CN 112196645B CN 202011164561 A CN202011164561 A CN 202011164561A CN 112196645 B CN112196645 B CN 112196645B
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- shell
- cylindrical shell
- cone
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- 238000007789 sealing Methods 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 30
- 239000004202 carbamide Substances 0.000 abstract description 19
- XSQUKJJJFZCRTK-UHFFFAOYSA-N urea group Chemical group NC(=O)N XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 abstract description 19
- 229910021529 ammonia Inorganic materials 0.000 abstract description 15
- 238000002156 mixing Methods 0.000 abstract description 14
- 238000002425 crystallisation Methods 0.000 abstract description 8
- 230000008025 crystallization Effects 0.000 abstract description 8
- 238000000354 decomposition reaction Methods 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 10
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 7
- 230000000694 effects Effects 0.000 description 4
- 238000004806 packaging method and process Methods 0.000 description 4
- 238000004364 calculation method 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
- 230000009471 action Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000000889 atomisation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
- F01N3/24—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
-
- 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]
-
- 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
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
-
- 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)
- Cyclones (AREA)
Abstract
The invention discloses a cylinder type cone pipe cyclone mixer which comprises a cylinder body, a front semi-cylinder shell, an arc baffle, a rear semi-cylinder shell, a bottom plate, an inclined plate, a cyclone cone pipe and an arc distributor, wherein a double semi-cylinder shell is arranged in the cylinder body and comprises the front semi-cylinder shell and the rear semi-cylinder shell, the arc baffle and the inclined plate are welded on two sides of the double semi-cylinder shell, the arc distributor is arranged on the rear side of the double semi-cylinder shell, the straight edge of the arc distributor is welded on the arc baffle, the bottom plate is welded on the bottom plate of the double semi-cylinder, the cyclone cone pipe is provided with a nozzle base, and the nozzle base is provided with a nozzle. The invention can meet the requirements of full decomposition of urea, reduction of urea crystallization risk and high ammonia distribution and mixing performance required by SCR emission under low back pressure.
Description
Technical Field
The invention relates to the technical field of diesel engine tail gas aftertreatment. More particularly, the present invention relates to a barrel cone swirl mixer.
Background
With implementation of the national sixth emission standard, requirements on automobile exhaust purification are becoming stricter, and SCR technology routes are adopted by most manufacturers as effective measures for reducing the content of nitrogen oxides (NOx) in automobile exhaust, and urea mixing devices related to the SCR technology routes become a key component. The urea solution is sprayed into the tail gas purifying device through the urea pump, atomized and converted into ammonia through the mixer, and the ammonia reacts with NOx under the action of the SCR catalyst to generate nitrogen and water, wherein the mixing degree of the ammonia and the tail gas is particularly important. The uneven mixing of ammonia and tail gas can cause the discharge to exceed the standard, and urea crystallization is closely related to the atomization degree of the sprayed urea aqueous solution, the temperature rise of air flow and the like. Under the premise of meeting emission requirements and low crystallization risk, the main engine factories pay more attention to reducing the back pressure of the urea mixing device. At present, many urea mixing schemes are difficult to solve the problems of poor urea crystallization and ammonia distribution at the same time under low back pressure.
Disclosure of Invention
An object of the invention is to provide a cylindrical cone-tube cyclone mixer which can meet the requirements of full urea decomposition, reduced urea crystallization risk and high ammonia distribution mixing performance required by SCR emission under low back pressure.
To achieve these objects and other advantages and in accordance with the purpose of the invention, there is provided a cone-tube cyclone mixer comprising:
the cylinder body is a shell of the tail gas aftertreatment device;
The front semi-cylindrical shell is positioned in the cylinder body, the upper surface and the lower surface of the front semi-cylindrical shell are both circular arcs fixed on the inner wall of the cylinder body, and the central axis of the front semi-cylindrical shell is perpendicular to the central axis of the cylinder body;
a circular arc baffle welded to one side of the front semi-cylindrical shell and the cylinder to seal between the one side of the front semi-cylindrical shell and the cylinder to block the side air flow;
The rear semi-cylinder shell is positioned in the cylinder body, the central axis of the rear semi-cylinder shell is also perpendicular to the central axis of the cylinder body, the diameter of the rear semi-cylinder shell is larger than that of the front semi-cylinder shell, the rear semi-cylinder shell is tangent to one side of the front semi-cylinder shell, which is provided with an arc baffle, an air inlet notch is formed at the other side of the rear semi-cylinder shell and the front semi-cylinder shell, the upper end of the rear semi-cylinder shell and the other side of the notch are arc-shaped and fixed on the inner wall of the cylinder body, and the eccentricity of the rear semi-cylinder shell and the front semi-cylinder shell is the difference value of two cylinder radiuses;
The bottom plate is fixedly formed by horizontally extending the lower end of the rear semi-cylindrical shell to the inner wall of the front semi-cylindrical shell, and a bottom plate hole is formed in the center of the bottom plate along the center of the front semi-cylindrical shell;
A sloping plate welded to the lower part of the front semi-cylindrical shell at the other side of the notch and the cylinder body to guide the tail gas flowing along the cylinder body from the notch to between the front semi-cylindrical shell and the rear semi-cylindrical shell;
The cyclone cone pipe is vertically arranged on the bottom plate, the central axes of the cyclone cone pipe, the front semi-cylindrical shell and the bottom plate hole on the bottom plate are coincident, a plurality of cyclone holes penetrating through the cyclone cone pipe are sequentially formed in the cyclone cone pipe along the conical surface from top to bottom, and the top of the cyclone cone pipe is sequentially provided with a nozzle base and a nozzle.
Preferably, the sealing device further comprises an arc distributor, wherein the arc distributor is arranged at the rear side of the rear semi-cylindrical shell and concentric with the rear semi-cylindrical shell, one side of the arc distributor is provided with a straight edge and welded on the arc baffle, the other sides of the arc distributor are provided with arc edges and welded on the cylinder body to form a sealing plate, and a plurality of distribution holes are formed in the arc distributor.
Preferably, the diameter of the rear half-cylinder housing is 1/3 to 1/4 greater than the diameter of the front half-cylinder housing.
Preferably, the cyclone cone pipe is of a truncated cone-shaped structure with a small upper part and a large lower part, and the inclination angle is set to be 12-20 degrees.
Preferably, the aperture of the cyclone holes is 6-10 mm, and the axial distance between the cyclone holes along the cyclone cone is 10-14 mm.
Preferably, the height of the cyclone cone pipe is 2/3-3/4 of the outer diameter of the cylinder body.
Preferably, the aperture of the bottom plate hole is 4/5-5/6 of the outer diameter of the air inlet pipe.
Preferably, the space between the cyclone cone pipe and the front semi-cylindrical shell is 1/2-2/3 of the aperture of the bottom plate hole.
Preferably, the aperture of the distribution hole is 6-10 mm.
Preferably, the outer diameter of the circular arc distributor is 1.15-1.3 times of that of the rear semi-cylindrical shell.
The invention at least comprises the following beneficial effects:
1. The mixer of the invention has simple structure and small space, and is suitable for shorter arrangement requirements.
2. When the airflow of the mixer enters the cyclone cone, the wrapping disturbance effect is good, the crystallization risk can be effectively reduced along the sufficiently long mixing path of the cyclone cone, and meanwhile, the SCR ammonia distribution requirement can be met under low back pressure.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a schematic view of the structure of a mixer of the present invention;
FIG. 2 is a cross-sectional view of the front structure of the mixer of the present invention;
FIG. 3 is a schematic elevational view of the mixer of the present invention;
FIG. 4 is a schematic top view of the mixer of the present invention;
FIG. 5 is a schematic view of the direction of the inlet air flow of the mixer of the present invention;
FIG. 6 is a schematic view of the direction of the outlet air flow of the mixer of the present invention.
Reference numerals illustrate:
1-double semi-cylindrical shell, 1-1-front semi-cylindrical shell, 1-2-rear semi-cylindrical shell, 2-circular baffle, 3-nozzle base, 4-nozzle, 5-bottom plate, 5-1-bottom plate hole, 6-swirl cone, 6-1-swirl hole, 7-circular distributor, 7-1-distribution hole, 8-sloping plate and 9-cylinder.
Detailed Description
The present invention is described in further detail below with reference to the drawings to enable those skilled in the art to practice the invention by referring to the description.
It should be noted that the experimental methods described in the following embodiments, unless otherwise specified, are all conventional methods, and the reagents and materials, unless otherwise specified, are all commercially available; in the description of the present invention, the terms "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus are not to be construed as limiting the present invention.
As shown in fig. 1 to 6, the present invention provides a barrel cone cyclone mixer comprising:
a cylinder 9, which is an exhaust gas aftertreatment device housing, i.e., a packaging housing;
a front semi-cylindrical shell 1-1 which is positioned in the cylinder 9 and the upper and lower surfaces of which are circular arcs fixed on the inner wall of the cylinder 9, wherein the central axis of the front semi-cylindrical shell 1-1 is vertical to the central axis of the cylinder 9;
a circular arc baffle 2 welded to one side of the front semi-cylindrical shell 1-1 and the cylinder 9 to seal between the one side of the front semi-cylindrical shell 1-1 and the cylinder 9 to block the side air flow;
The rear semi-cylinder shell 1-2 is positioned in the cylinder 9, the central axis of the rear semi-cylinder shell 1-2 is also perpendicular to the central axis of the cylinder 9, the diameter of the rear semi-cylinder shell 1-2 is larger than that of the front semi-cylinder shell 1-1, the rear semi-cylinder shell 1-2 is tangent to one side of the front semi-cylinder shell 1-1, which is provided with the circular arc baffle 2, an air inlet gap is formed between the rear semi-cylinder shell 1-2 and the other side of the front semi-cylinder shell 1-1, the upper end of the rear semi-cylinder shell 1-2 and the other side of the gap are circular arc fixed on the inner wall of the cylinder 9, and the eccentric distance between the rear semi-cylinder shell 1-2 and the front semi-cylinder shell 1-1 is the difference value of two cylinder radiuses;
the bottom plate 5 is fixedly formed by horizontally extending the lower end of the rear semi-cylindrical shell 1-2 to the inner wall of the front semi-cylindrical shell 1-1, and the center of the bottom plate 5 is provided with a bottom plate hole 5-1 along the center of the front semi-cylindrical shell 1-1;
A sloping plate 8 welded to the lower part of the front semi-cylindrical shell 1-1 at the other side of the notch and the cylinder 9 to guide the exhaust gas flowing along the inside of the cylinder 9 from the notch to between the front semi-cylindrical shell 1-1 and the rear semi-cylindrical shell 1-2;
the cyclone cone pipe 6 is vertically arranged on the bottom plate 5, central axes of the cyclone cone pipe 6, the front semi-cylindrical shell 1-1 and the bottom plate hole 5-1 on the bottom plate 5 are overlapped, a plurality of cyclone holes 6-1 penetrating into the cyclone cone pipe 6 are sequentially formed in the cyclone cone pipe 6 from top to bottom along the conical surface, and a nozzle base 3 and a nozzle 4 are sequentially arranged at the top of the cyclone cone pipe 6;
The circular arc distributor 7 is arranged at the rear side of the rear semi-cylindrical shell 1-2 and concentric with the rear semi-cylindrical shell 1-2, one side of the circular arc distributor 7 is provided with a straight edge and welded on the circular arc baffle 2, the other sides of the circular arc distributor 7 are provided with circular arc sides and welded on the cylinder 9 to form a sealing plate, and a plurality of distribution holes are formed in the circular arc distributor 7.
In the technical scheme, the cylindrical cone-tube cyclone mixer can meet the requirements of full urea decomposition, urea crystallization risk reduction and ammonia distribution required by SCR emission under low back pressure. The main structure is as follows: the barrel 9 is internally provided with a double-semicylindrical shell 1 which comprises a front semicylindrical shell 1-1 and a rear semicylindrical shell 1-2, arc baffle plates 2 and inclined plates 8 are welded on two sides of the double-semicylindrical shell 1, an arc distributor 7 is arranged on the rear side of the double-semicylindrical shell 1, straight edges of the arc distributor 7 are welded on the arc baffle plates 2, the bottom of the double-semicylindrical shell 1 is welded with a bottom plate 5, a cyclone cone pipe 6 is arranged on the bottom plate 5, a nozzle base 3 is arranged on the cyclone cone pipe 6, and a nozzle 4 is arranged on the nozzle base 3.
As shown in fig. 5, the air flow enters the cyclone cavity between the double semi-cylinder 1 and the cyclone cone 6 along the inclined plate 8 under the blocking of the front semi-cylinder 1-1 and the circular arc baffle 2, the cyclone cavity gradually becomes smaller along the air flow direction, huge rotating air flow is formed in the cyclone cavity, the air flow rotating in the cavity enters the cyclone cone 6 along the cyclone hole 6-1, the rotating air flow enters the cyclone hole 6-1 around the cyclone cone 6 and then is subjected to cyclone again, the twice cyclone air flow fully wraps and mixes urea injected into the cyclone cone 6, the rotating mixed air flow always has an axially downward speed component along the cyclone cone 6, and urea spray is axially carried out of the bottom plate hole 5-1 along the cyclone cone 6. As shown in fig. 6, a part of the air flow flowing out from the bottom plate hole 5-1 flows out along the distribution hole 7-1 at the lower part of the circular arc distributor 7, and the other part enters the cavity between the rear semi-cylinder 1-2 and the circular arc distributor 7 upwards and flows out along the distribution hole 7-1 at the upper part of the circular arc distributor 7. The airflow entering the cyclone cone 6 can fully wrap urea spray sprayed from the nozzle 4 under the twice cyclone, and is mixed up and down along the cyclone cone 6 under the action of the airflow, so that the risk of touching the wall of the urea spray in the mixing and heating process is reduced, thicker liquid film can not be generated in the inner wall surface area of the cyclone cone 6, and the crystallization risk is effectively reduced; the height of the rotational flow taper pipe 6 is 2/3-3/4 of the outer diameter of the cylinder 9, and a sufficiently long mixing path can ensure that the mixing property and the temperature of the air flow flowing out of the bottom plate hole 5-1 can meet the set requirements. In order to prevent the air flow flowing out through the bottom plate hole 5-1 from deviating to one side below the bottom plate 5, an arc distributor 7 is arranged behind the rear semi-cylinder 1-2, and the speed uniformity and the ammonia distribution uniformity of the air flow entering the SCR can be effectively improved by adjusting the distance between the arc distributor 7 and the rear semi-cylinder 1-2 and the size of the distribution hole 7-1, so that the air flow reaches the technical index of an engine plant with a preset design. The air flow escapes from the circular arc distributor 7 along the space below the bottom plate 5 after passing through the cyclone cone pipe 6, and the air flow in the mixer sequentially passes through the cyclone hole 6-1, the bottom plate hole 5-1 and the distribution hole 7-1, so that the three holes are smooth, no sharp change gap exists, and the generated pressure difference is low.
In another technical scheme, the diameter of the rear semi-cylindrical shell 1-2 is 1/3-1/4 larger than that of the front semi-cylindrical shell 1-1, and the diameter range is the optimal range summarized by combining simulation calculation and experimental test, and directly determines the size of an air inlet gap, so that the smaller difference value between the diameter of the rear semi-cylindrical shell 1-2 and that of the front semi-cylindrical shell 1-1 can lead to larger back pressure of the whole package; a larger difference will affect the swirling effect of the swirling chamber formed by the rear and front half-cylinder housings 1-2, 1-1, affecting the mixing effect, resulting in a lower ammonia distribution.
In another technical scheme, the cyclone cone 6 has a truncated cone-shaped structure with a small upper part and a large lower part, and the inclination angle is set to be 12-20 degrees, and the inclination angle range is the optimal inclination angle summarized by combining simulation calculation and test, and the larger or smaller inclination angle can affect the air flow mixing effect.
In another technical scheme, the height of the cyclone cone 6 is 2/3-3/4 of the outer diameter of the cylinder 9, and the larger height of the cyclone cone 6 can reduce the mixing path of the cyclone cone 6, so that the air flows can not be fully mixed; the smaller height of the swirl cone pipe 6 can increase the back pressure on one hand and the airflow flowing out of the circular arc distributor 7 is deflected downwards on the other hand, so that the ammonia distribution is not improved; the height of the cyclone cone 6 is the result of actual measurement of multiple optimization calculations.
In another technical scheme, the aperture of the bottom plate hole 5-1 is 4/5-5/6 of the outer diameter of the air inlet pipe. The size of the bottom plate hole 5-1 refers to the outer diameter of the packaging air inlet pipe, which is generally 4/5-5/6 of the outer diameter of the air inlet pipe, is smaller than the air inlet pipe, generates certain back pressure, ensures that the air flow and ammonia generated by urea injection are uniformly mixed, and meets the ammonia distribution requirement; kong Pianxiao the back pressure is too large, and Kong Pianda ammonia distribution does not reach the standard. The section of pipe between the exhaust gas of the engine and the exhaust gas aftertreatment device, namely the packaging, is a packaging air inlet pipe.
In another technical scheme, the aperture of the cyclone holes 6-1 is 6-10 mm, and the axial distance between the cyclone holes 6-1 along the cyclone cone 6 is 10-14 mm.
In another technical scheme, the aperture of the distribution hole is 6-10 mm.
In another technical scheme, the space between the cyclone cone pipe 6 and the front semi-cylindrical shell 1-1 is 1/2-2/3 of the aperture of the bottom plate hole 5-1.
In another technical scheme, the outer diameter of the circular arc distributor 7 is 1.15-1.3 times of that of the rear semi-cylindrical shell 1-2.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the invention would be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (8)
1. A barrel cone swirl mixer comprising:
the cylinder body is a shell of the tail gas aftertreatment device;
The front semi-cylindrical shell is positioned in the cylinder body, the upper surface and the lower surface of the front semi-cylindrical shell are both circular arcs fixed on the inner wall of the cylinder body, and the central axis of the front semi-cylindrical shell is perpendicular to the central axis of the cylinder body;
a circular arc baffle welded to one side of the front semi-cylindrical shell and the cylinder to seal between the one side of the front semi-cylindrical shell and the cylinder to block the side air flow;
The rear semi-cylinder shell is positioned in the cylinder body, the central axis of the rear semi-cylinder shell is also perpendicular to the central axis of the cylinder body, the diameter of the rear semi-cylinder shell is larger than that of the front semi-cylinder shell, the rear semi-cylinder shell is tangent to one side of the front semi-cylinder shell, which is provided with an arc baffle, an air inlet notch is formed at the other side of the rear semi-cylinder shell and the front semi-cylinder shell, the upper end of the rear semi-cylinder shell and the other side of the notch are arc-shaped and fixed on the inner wall of the cylinder body, and the eccentricity of the rear semi-cylinder shell and the front semi-cylinder shell is the difference value of two cylinder radiuses;
The bottom plate is fixedly formed by horizontally extending the lower end of the rear semi-cylindrical shell to the inner wall of the front semi-cylindrical shell, and a bottom plate hole is formed in the center of the bottom plate along the center of the front semi-cylindrical shell;
A sloping plate welded to the lower part of the front semi-cylindrical shell at the other side of the notch and the cylinder body to guide the tail gas flowing along the cylinder body from the notch to between the front semi-cylindrical shell and the rear semi-cylindrical shell;
the cyclone cone pipe is vertically arranged on the bottom plate, central axes of the cyclone cone pipe, the front semi-cylindrical shell and a bottom plate hole on the bottom plate are overlapped, a plurality of cyclone holes penetrating into the cyclone cone pipe are sequentially formed in the cyclone cone pipe along the conical surface from top to bottom, and a nozzle base and a nozzle are sequentially arranged at the top of the cyclone cone pipe;
The circular arc distributor is arranged at the rear side of the rear semi-cylindrical shell and concentric with the rear semi-cylindrical shell, one side of the circular arc distributor is provided with a straight edge and welded on the circular arc baffle, the other sides of the circular arc distributor are provided with circular arc sides and welded on the cylinder body to form a sealing plate, and the circular arc distributor is provided with a plurality of distribution holes;
The diameter of the rear semi-cylindrical shell is 1/3-1/4 larger than that of the front semi-cylindrical shell.
2. The cylindrical cone cyclone mixer as claimed in claim 1, wherein the cyclone cone has a truncated cone-shaped structure with a small upper part and a large lower part, and the inclination angle is set to be 12 ° to 20 °.
3. The barrel cone swirl mixer of claim 1, wherein the aperture of the swirl holes is 6-10 mm, and the axial spacing of the swirl holes along the swirl cone is 10-14 mm.
4. The barrel cone swirl mixer of claim 1, wherein the swirl cone height is 2/3-3/4 of the barrel outer diameter.
5. The cylindrical cone-tube cyclone mixer of claim 1 wherein the aperture of said bottom plate hole is 4/5-5/6 of the outer diameter of the air inlet tube.
6. The barrel cone swirl mixer of claim 1, wherein the spacing between the swirl cone and the front semi-cylindrical shell is 1/2-2/3 of the aperture of the base plate aperture.
7. A barrel cone swirl mixer as claimed in claim 1, characterised in that the aperture of the distribution holes is 6-10 mm.
8. A barrel cone swirl mixer as claimed in claim 1 in which the circular arc distributor has an outer diameter of 1.15 to 1.3 times that of the rear semi-cylindrical shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011164561.7A CN112196645B (en) | 2020-10-27 | 2020-10-27 | Cylindrical cone pipe cyclone mixer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011164561.7A CN112196645B (en) | 2020-10-27 | 2020-10-27 | Cylindrical cone pipe cyclone mixer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112196645A CN112196645A (en) | 2021-01-08 |
| CN112196645B true CN112196645B (en) | 2024-07-26 |
Family
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| DE102014009015A1 (en) * | 2014-06-17 | 2015-12-17 | Daimler Ag | Mixing device of an exhaust gas purification system of a motor vehicle internal combustion engine |
| CN108104912A (en) * | 2016-11-25 | 2018-06-01 | 天纳克（苏州）排放系统有限公司 | Tail-gas after treatment apparatus |
| CN208396786U (en) * | 2017-12-31 | 2019-01-18 | 无锡威孚力达催化净化器有限责任公司 | A kind of horizontal mixing arrangement of cyclone pipe for spar-type platforms |
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