CN213598047U - Barrel type taper pipe rotational flow mixer - Google Patents
Barrel type taper pipe rotational flow mixer Download PDFInfo
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- CN213598047U CN213598047U CN202022421133.XU CN202022421133U CN213598047U CN 213598047 U CN213598047 U CN 213598047U CN 202022421133 U CN202022421133 U CN 202022421133U CN 213598047 U CN213598047 U CN 213598047U
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Abstract
The utility model discloses a cylinder taper pipe whirl blender, including barrel, preceding semicylinder casing, circular arc baffle, back semicylinder casing, bottom plate, swash plate, whirl taper pipe, circular arc distributor, set up two semicylinder casings in the barrel, it includes preceding semicylinder casing and latter half cylinder casing, two semicylinder casing both sides welding circular arc baffle and swash plate, just two semicylinder casing rear sides set up the circular arc distributor, the straight flange welding of circular arc distributor is in on the circular arc baffle, two semicylinder bottom weld plate, set up the whirl taper pipe on the bottom plate, set up nozzle base on the whirl taper pipe, set up the nozzle on the nozzle base. The utility model discloses can satisfy urea fully to decompose, reduce urea crystallization risk and satisfy SCR and discharge required ammonia distribution high mixing performance requirement under low backpressure.
Description
Technical Field
The utility model relates to a diesel engine tail gas aftertreatment technical field. More specifically, the utility model relates to a cylinder taper pipe whirl blender.
Background
With the implementation of the national emission standard, the requirement for automobile exhaust purification is more and more strict, and the SCR technical route is adopted by most manufacturers as an effective measure for reducing the content of nitrogen oxides (NOx) in automobile exhaust, and a urea mixing device related to the SCR technical route becomes a key component. The urea solution is sprayed into a tail gas purification device through a urea pump, is atomized and converted into ammonia gas through a mixer, the ammonia gas reacts with NOx under the action of an SCR catalyst to generate nitrogen and water, and the mixing degree of the ammonia gas and the tail gas is particularly important. The emission standard exceeding can be caused by the uneven mixing of ammonia and tail gas, and the urea crystallization is closely related to the atomization degree of the sprayed urea aqueous solution, the temperature rise of air flow and the like. On the premise of meeting emission requirements and low crystallization risk, the main engine plant is more and more concerned about reducing the back pressure of the urea mixing device. Many urea mixing schemes at present are difficult to solve the problems of urea crystallization and poor ammonia distribution at the same time under low back pressure.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a cylinder taper pipe whirl blender can satisfy urea fully to decompose, reduce urea crystallization risk and satisfy the required ammonia distribution high mixing performance requirement of SCR emission under low backpressure.
To achieve these objects and other advantages in accordance with the purpose of the invention, there is provided a cone-type cyclone mixer, comprising:
the cylinder body is a shell of the tail gas post-treatment device;
the front semi-cylindrical shell is positioned in the barrel, the upper surface and the lower surface of the front semi-cylindrical shell are both in an arc shape fixed on the inner wall of the barrel, and the central axis of the front semi-cylindrical shell is vertical to the central axis of the barrel;
an arc baffle welded to one side of the front semi-cylindrical shell and the barrel to seal a space between the one side of the front semi-cylindrical shell and the barrel to block the side airflow;
the rear semi-cylindrical shell is positioned in the barrel, the central axis of the rear semi-cylindrical shell is also perpendicular to the central axis of the barrel, the diameter of the rear semi-cylindrical shell is larger than that of the front semi-cylindrical shell, one side of the rear semi-cylindrical shell, which is provided with the arc baffle, is tangent to one side of the front semi-cylindrical shell, the other side of the rear semi-cylindrical shell and the other side of the front semi-cylindrical shell form an air inlet notch, the upper end of the rear semi-cylindrical shell and the other side of the notch are in the shape of an arc fixed on the inner wall of the barrel, and the eccentric distance between the rear semi-cylindrical shell and the front;
the bottom plate is formed by horizontally extending the lower end of the rear semi-cylindrical shell to the inner wall of the front semi-cylindrical shell and is fixed, and a bottom plate hole is formed in the center of the bottom plate along the center of the front semi-cylindrical shell;
the inclined plate is welded on the lower part of the front semi-cylindrical shell, which is positioned on the other side of the notch, and the cylinder body so as to guide tail gas flowing in the cylinder body to a position between the front semi-cylindrical shell and the rear semi-cylindrical shell from the notch;
the whirl taper pipe, its vertical set up in on the bottom plate, the whirl taper pipe preceding semicircle column casing and bottom plate hole three the central axis coincidence on the bottom plate, the whirl taper pipe has seted up the several along the conical surface from last to having link up to the inside whirl hole of whirl taper pipe down in proper order, whirl taper pipe top has set gradually nozzle base and nozzle.
Preferably, the rear half-cylinder type sealing device further comprises an arc distributor which is arranged at the rear side of the rear half-cylinder shell and is concentric with the rear half-cylinder shell, one side of the arc distributor is a straight edge and is welded on the arc baffle, the other sides of the arc distributor are arc sides and are welded on the cylinder body to form a sealing plate, and the arc distributor is provided with a plurality of distribution holes.
Preferably, the diameter of the rear semi-cylindrical shell is 1/3-1/4 larger than the diameter of the front semi-cylindrical shell.
Preferably, the cyclone conical tube is of a circular truncated cone 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 swirl hole is 6-10 mm, and the axial distance between the swirl hole and the swirl taper pipe is 10-14 mm.
Preferably, the height of the cyclone conical tube is 2/3-3/4 of the outer diameter of the cylinder.
Preferably, the hole diameter of the bottom plate hole is 4/5 ~ 5/6 of intake pipe external diameter.
Preferably, the distance between the swirling conical 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 utility model discloses at least, include following beneficial effect:
1. the utility model discloses a blender simple structure, space are little, are fit for shorter arranging the requirement.
2. The utility model discloses a blender air current is when getting into the whirl taper pipe, and parcel disturbance effect is good, can effectively reduce the crystallization risk along the enough long mixed route of whirl taper pipe, compromises simultaneously and satisfies SCR ammonia distribution requirement under the 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 structural diagram of a mixer of the present invention;
FIG. 2 is a cross-sectional view of the mixer of the present invention;
FIG. 3 is a schematic diagram of a front view of the mixer of the present invention;
FIG. 4 is a schematic diagram of a top view of the mixer of the present invention;
FIG. 5 is a schematic view of the intake airflow direction of the mixer of the present invention;
fig. 6 is a schematic view of the direction of the air flow of the mixer of the present invention.
Description of reference numerals:
1-double semi-cylindrical shell, 1-1-front semi-cylindrical shell, 1-2-rear semi-cylindrical shell, 2-arc baffle, 3-nozzle base, 4-nozzle, 5-bottom plate, 5-1-bottom plate hole, 6-cyclone conical tube, 6-1-cyclone hole, 7-arc distributor, 7-1-distribution hole, 8-sloping plate and 9-cylinder.
Detailed Description
The present invention is further described in detail below with reference to the drawings so that those skilled in the art can implement the invention with reference to the description.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "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, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.
As shown in fig. 1 to 6, the utility model provides a cylinder taper pipe whirl blender, include:
the cylinder 9 is a shell of the tail gas aftertreatment device, namely a packaging shell;
the front semi-cylindrical shell 1-1 is positioned in the barrel 9, the upper surface and the lower surface of the front semi-cylindrical shell are both arc-shaped and fixed on the inner wall of the barrel 9, and the central axis of the front semi-cylindrical shell 1-1 is vertical to the central axis of the barrel 9;
the arc baffle 2 is welded on one side of the front semi-cylindrical shell 1-1 and the barrel 9 so as to seal the space between one side of the front semi-cylindrical shell 1-1 and the barrel 9 to block the side airflow;
the rear semi-cylindrical shell 1-2 is positioned in the barrel 9, the central axis of the rear semi-cylindrical shell is also perpendicular to the central axis of the barrel 9, the diameter of the rear semi-cylindrical shell 1-2 is larger than that of the front semi-cylindrical shell 1-1, the rear semi-cylindrical shell 1-2 is tangent to one side, provided with the arc baffle 2, of the front semi-cylindrical shell 1-1, an air inlet notch is formed between the rear semi-cylindrical shell 1-2 and the other side of the front semi-cylindrical shell 1-1, the upper end of the rear semi-cylindrical shell 1-2 and the other side of the notch are in an arc shape fixed on the inner wall of the barrel 9, and the eccentric distance between the rear semi-cylindrical shell 1-2 and the front semi-cylindrical shell 1-1 is a difference value of;
the bottom plate 5 is 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 is fixed, and a bottom plate hole 5-1 is formed in the center of the bottom plate 5 along the center of the front semi-cylindrical shell 1-1;
the inclined plate 8 is welded on the lower part of the other side of the notch of the front semi-cylindrical shell 1-1 and the barrel 9 so as to guide tail gas flowing along the barrel 9 from the notch to a position between the front semi-cylindrical shell 1-1 and the rear semi-cylindrical shell 1-2;
the rotational flow conical pipe 6 is vertically arranged on the bottom plate 5, the central axes of the rotational flow conical pipe 6, the front semi-cylindrical shell 1-1 and the bottom plate hole 5-1 on the bottom plate 5 are superposed, the rotational flow conical pipe 6 is sequentially provided with a plurality of rotational flow holes 6-1 penetrating into the rotational flow conical pipe 6 from top to bottom along a conical surface, and the top of the rotational flow conical pipe 6 is sequentially provided with a nozzle base 3 and a nozzle 4;
the circular arc distributor 7 is arranged on the rear side of the rear semi-cylindrical shell 1-2 and is concentric with the rear semi-cylindrical shell 1-2, one side of the circular arc distributor 7 is a straight edge and is welded on the circular arc baffle 2, the other sides of the circular arc distributor 7 are circular arc sides and are welded on the cylinder body 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 cylinder type taper pipe cyclone mixer can meet the requirements of fully decomposing urea, reducing the crystallization risk of urea and meeting the ammonia distribution requirement required by SCR emission under low back pressure. The main structure is as follows: set up two semicylinder casings 1 in barrel 9, it includes preceding semicylinder casing 1-1 and latter half cylinder casing 1-2, 1 both sides welding circular arc baffle 2 and swash plate 8 of two semicylinder casings, just 1 rear side of two semicylinder casings sets up circular arc distributor 7, the straight flange welding of circular arc distributor 7 is in on the circular arc baffle 2, 1 bottom welding bottom plate 5 of two semicylinder casings, set up whirl taper pipe 6 on the bottom plate 5, set up nozzle base 3 on the whirl taper pipe 6, set up nozzle 4 on the nozzle base 3.
As shown in fig. 5, the air flow enters a cyclone cavity between the double semi-cylinders 1 and the cyclone taper pipe 6 along the inclined plate 8 under the blocking of the front semi-cylinder 1-1 and the 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 rotating air flow in the cavity enters the cyclone taper pipe 6 along the cyclone hole 6-1, the rotating air flow performs cyclone again after entering the cyclone holes 6-1 around the cyclone taper pipe 6, the urea mixed and injected into the cyclone taper pipe 6 is fully wrapped by the two cyclone air flows, the rotating mixed air flow always has an axial downward velocity component along the cyclone taper pipe 6, and the urea spray is brought out of the bottom plate hole 5-1 along the axial direction of the cyclone taper pipe 6. As shown in figure 6, a part of the air flow flowing out of 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 of the air flow upwards enters the cavity between the rear semi-cylinder 1-2 and the circular arc distributor 7 and then flows out along the distribution hole 7-1 at the middle upper part of the circular arc distributor 7. The air flow entering the cyclone conical pipe 6 can fully wrap the urea spray sprayed from the nozzle 4 under the twice whirling, and the urea spray is mixed up and down along the cyclone conical pipe 6 under the action of the air flow, so that the risk that the urea spray touches the wall in the mixing and heating process is reduced, a thicker liquid film cannot be generated in the inner wall surface area of the cyclone conical pipe 6, and the crystallization risk is effectively reduced; the height of the rotational flow conical 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 performance and the temperature of the airflow flowing out of the bottom plate hole 5-1 can meet the set requirements. In order to prevent the airflow flowing out of the bottom plate hole 5-1 from deviating to one side below the bottom plate 5, the arc distributor 7 is arranged behind the rear semi-cylinder 1-2, and the speed uniformity and the ammonia distribution uniformity of the airflow 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 airflow reaches the technical index of a preset designed engine plant. The air flows through the cyclone conical pipe 6 and then escapes from the circular arc distributor 7 along the lower space of the bottom plate 5, the air flow in the mixer sequentially passes through the cyclone holes 6-1, the bottom plate holes 5-1 and the distribution holes 7-1, the three types of holes flow smoothly, no rapidly-changed 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, the diameter range is an optimal range summarized by combining simulation calculation and test, the range directly determines the size of an air inlet gap, and the difference between the diameter of the rear semi-cylindrical shell 1-2 and that of the front semi-cylindrical shell 1-1 is too small, so that the back pressure of the whole package is larger; the larger difference value can influence the rotational flow effect of the rotational flow cavity formed by the rear semi-cylindrical shell 1-2 and the front semi-cylindrical shell 1-1, and influence the mixing effect, so that the ammonia distribution is lower.
In another technical scheme, the cyclone conical tube 6 is of a circular truncated cone structure with a small upper part and a large lower part, the inclination angle is set to be 12-20 degrees, the inclination angle range is the best inclination angle summarized by combining simulation calculation and test tests, and the air flow mixing effect can be influenced by the larger or smaller inclination angle.
In another technical scheme, the height of the cyclone conical tube 6 is 2/3-3/4 of the outer diameter of the cylinder 9, and the larger height of the cyclone conical tube 6 can reduce the mixing path of the cyclone conical tube 6, so that the air flow cannot be fully mixed; the smaller height of the cyclone conical pipe 6 can increase the back pressure on one hand, and on the other hand, the lower part of the airflow flowing out of the arc distributor 7 can not improve the ammonia distribution; the height of the rotational flow conical pipe 6 is the result of multiple optimization calculation actual measurement.
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, generally is 4/5-5/6 of the outer diameter of the air inlet pipe, is smaller than that of the air inlet pipe, generates a certain back pressure, enables air flow and ammonia generated by urea injection to be uniformly mixed, and meets the requirement of ammonia distribution; the pore size is small, the back pressure is too large, and the pore size ammonia distribution does not reach the standard. A section of pipe between the engine exhaust and the tail gas after-treatment device, namely the package is a package air inlet pipe.
In another technical scheme, the aperture of the swirl hole 6-1 is 6-10 mm, and the axial distance between the swirl hole 6-1 and the swirl conical tube 6 is 10-14 mm.
In another technical scheme, the aperture of the distribution hole is 6-10 mm.
In another technical scheme, the distance between the cyclone conical 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.
While the embodiments of the invention have been described above, it is not intended to be limited to the details shown, or described, but rather to cover all modifications, which would come within the scope of the appended claims, and all changes which come within the meaning and range of equivalency of the art are therefore intended to be embraced therein.
Claims (10)
1. A cylindrical cone swirl mixer, comprising:
the cylinder body is a shell of the tail gas post-treatment device;
the front semi-cylindrical shell is positioned in the barrel, the upper surface and the lower surface of the front semi-cylindrical shell are both in an arc shape fixed on the inner wall of the barrel, and the central axis of the front semi-cylindrical shell is vertical to the central axis of the barrel;
an arc baffle welded to one side of the front semi-cylindrical shell and the barrel to seal a space between the one side of the front semi-cylindrical shell and the barrel to block the side airflow;
the rear semi-cylindrical shell is positioned in the barrel, the central axis of the rear semi-cylindrical shell is also perpendicular to the central axis of the barrel, the diameter of the rear semi-cylindrical shell is larger than that of the front semi-cylindrical shell, one side of the rear semi-cylindrical shell, which is provided with the arc baffle, is tangent to one side of the front semi-cylindrical shell, the other side of the rear semi-cylindrical shell and the other side of the front semi-cylindrical shell form an air inlet notch, the upper end of the rear semi-cylindrical shell and the other side of the notch are in the shape of an arc fixed on the inner wall of the barrel, and the eccentric distance between the rear semi-cylindrical shell and the front;
the bottom plate is formed by horizontally extending the lower end of the rear semi-cylindrical shell to the inner wall of the front semi-cylindrical shell and is fixed, and a bottom plate hole is formed in the center of the bottom plate along the center of the front semi-cylindrical shell;
the inclined plate is welded on the lower part of the front semi-cylindrical shell, which is positioned on the other side of the notch, and the cylinder body so as to guide tail gas flowing in the cylinder body to a position between the front semi-cylindrical shell and the rear semi-cylindrical shell from the notch;
the whirl taper pipe, its vertical set up in on the bottom plate, the whirl taper pipe preceding semicircle column casing and bottom plate hole three the central axis coincidence on the bottom plate, the whirl taper pipe has seted up the several along the conical surface from last to having link up to the inside whirl hole of whirl taper pipe down in proper order, whirl taper pipe top has set gradually nozzle base and nozzle.
2. A cylindrical cone swirl mixer according to claim 1 further comprising a circular arc distributor disposed at the rear side of the rear semi-cylindrical housing concentrically with the rear semi-cylindrical housing, one of the sides of the circular arc distributor being configured as a straight side and welded to the circular arc baffle, the other side of the circular arc distributor being configured as a circular arc side and welded to the cylindrical body to form a sealing plate, the circular arc distributor being provided with a plurality of distribution holes.
3. A barrel cone swirl mixer according to claim 1 in which the diameter of the rear semi-cylindrical housing is 1/3-1/4 greater than the diameter of the front semi-cylindrical housing.
4. A barrel type taper pipe cyclone mixer as claimed in claim 1, wherein the cyclone taper pipe is of a truncated cone structure with a small top and a large bottom, and the inclination angle is set to 12-20 °.
5. A barrel type taper pipe rotational flow mixer as claimed in claim 1, wherein the aperture of the rotational flow holes is 6-10 mm, and the axial distance of the rotational flow holes along the rotational flow taper pipe is 10-14 mm.
6. A barrel cone swirl mixer according to claim 1 in which the swirl cone height is 2/3 to 3/4 of the barrel outside diameter.
7. A barrel type taper pipe rotational flow mixer as claimed in claim 1, wherein the aperture of the bottom plate hole is 4/5-5/6 of the outer diameter of the air inlet pipe.
8. A barrel type taper pipe cyclone mixer as claimed in claim 1, wherein the distance between the cyclone taper pipe and the front semi-cylindrical shell is 1/2-2/3 of the hole diameter of the bottom plate.
9. A barrel type taper pipe rotational flow mixer as claimed in claim 2, wherein the aperture of the distribution hole is 6-10 mm.
10. A barrel cone swirl mixer according to claim 2 in which the circular arc distributor has an outer diameter of 1.15 to 1.3 times the rear semi-cylindrical housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022421133.XU CN213598047U (en) | 2020-10-27 | 2020-10-27 | Barrel type taper pipe rotational flow mixer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022421133.XU CN213598047U (en) | 2020-10-27 | 2020-10-27 | Barrel type taper pipe rotational flow mixer |
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| CN213598047U true CN213598047U (en) | 2021-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202022421133.XU Active CN213598047U (en) | 2020-10-27 | 2020-10-27 | Barrel type taper pipe rotational flow mixer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112196645A (en) * | 2020-10-27 | 2021-01-08 | 武汉洛特福动力技术有限公司 | Barrel type taper pipe rotational flow mixer |
-
2020
- 2020-10-27 CN CN202022421133.XU patent/CN213598047U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112196645A (en) * | 2020-10-27 | 2021-01-08 | 武汉洛特福动力技术有限公司 | Barrel type taper pipe rotational flow mixer |
| CN112196645B (en) * | 2020-10-27 | 2024-07-26 | 武汉洛特福动力技术有限公司 | Cylindrical cone pipe cyclone mixer |
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A cylindrical conical tube cyclone mixer Effective date of registration: 20220314 Granted publication date: 20210702 Pledgee: Bank of China Limited Wuhan Economic and Technological Development Zone sub branch Pledgor: LOTUSFAIRY POWER TECHNOLOGIES Corp. Registration number: Y2022420000060 |
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| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20230423 Granted publication date: 20210702 Pledgee: Bank of China Limited Wuhan Economic and Technological Development Zone sub branch Pledgor: LOTUSFAIRY POWER TECHNOLOGIES Corp. Registration number: Y2022420000060 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A cylindrical conical tube swirl mixer Effective date of registration: 20230425 Granted publication date: 20210702 Pledgee: Bank of China Limited Wuhan Economic and Technological Development Zone sub branch Pledgor: LOTUSFAIRY POWER TECHNOLOGIES Corp. Registration number: Y2023420000185 |