CN113027573A - Wall flow vortex mixer - Google Patents
Wall flow vortex mixer Download PDFInfo
- Publication number
- CN113027573A CN113027573A CN202110181281.5A CN202110181281A CN113027573A CN 113027573 A CN113027573 A CN 113027573A CN 202110181281 A CN202110181281 A CN 202110181281A CN 113027573 A CN113027573 A CN 113027573A
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- CN
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- Prior art keywords
- cavity
- vortex tube
- tube
- shell
- vortex
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000009987 spinning Methods 0.000 claims abstract description 5
- 230000000903 blocking effect Effects 0.000 claims description 6
- 238000005192 partition Methods 0.000 claims description 5
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 29
- 239000004202 carbamide Substances 0.000 description 29
- 238000002156 mixing Methods 0.000 description 10
- 238000002425 crystallisation Methods 0.000 description 9
- 230000008025 crystallization Effects 0.000 description 9
- 239000007789 gas Substances 0.000 description 9
- 239000002912 waste gas Substances 0.000 description 9
- 230000014759 maintenance of location Effects 0.000 description 5
- 238000006243 chemical reaction Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- 238000000354 decomposition reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 3
- 238000006722 reduction reaction Methods 0.000 description 3
- 239000007864 aqueous solution Substances 0.000 description 2
- 239000000969 carrier Substances 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—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
- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/20—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a flow director or deflector
-
- 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
-
- 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
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)
Abstract
The invention discloses a wall flow vortex mixer, which comprises a shell, an inner vortex tube and an outer vortex tube, wherein the first end of the outer vortex tube is fixed at one side of a second cavity of a clapboard, a first plug cover is arranged at the second end, a first air hole is arranged on a tube body of the outer vortex tube, the first end of the inner vortex tube extends into the outer vortex tube, a second plug cover is arranged at the second end, a nozzle seat is arranged on the second plug cover, vortex sheets are uniformly distributed on the tube body of the inner vortex tube positioned in the first cavity in the circumferential direction, a second air hole is arranged on the tube body positioned in the second cavity, air flow in the shell enters the inner vortex tube through the vortex sheets to form vortex, a first end port of the inner vortex tube forms a gap close to the first plug cover, the second air hole is positioned at the first end of the inner vortex tube and is only arranged on the side surface facing the shell, and an air outlet hole is positioned at the first end of the outer vortex tube, only set up on the side of the end of giving vent to anger of the back to the casing, the second blanking cover sinks in the casing, and the spinning disk extends to second blanking cover department.
Description
Technical Field
The invention relates to the technical field of diesel engine tail gas treatment, in particular to a wall-flow vortex mixer.
Background
SCR (Selective Catalyst reduction) used for selective catalytic conversion system of diesel engine refers to the method for installing selective catalytic conversion system SCR (Selective Catalyst reduction) in exhaust system of diesel vehicle to discharge NO in diesel engineXCatalytic reduction to N2And O2The catalytic reduction device of (3) selects an aqueous urea solution as the reducing agent. Aqueous urea solution is injected into the mixer upstream of the catalyst and is hydrolyzed to produce CO under the influence of the exhaust gas temperature and the gas flow2And NH3，NH3By using NO as a reducing agentXReduction to non-polluting N2And H2O。
The mixer is an essential component of the SCR system, which is used for crushing and mixing the urea aqueous solution and the exhaust gas, and the key technology of the SCR system is the crushing of the urea aqueous solution and the exhaust gas and the NH3And (4) mixing uniformity. Fig. 2 shows a conventional urea injection double-tube mixer, in which atomized urea injected from a nozzle is injected into an inner layer swirl hole tube 2 ' through a nozzle holder 1 ' and is mixed with an air flow flowing through the inner layer swirl hole tube 2 '; the mixed urea and waste gas mixture flows into a cavity formed by the inner layer rotational flow hole pipe 2 'and the outer layer hole pipe 4' through the air hole on the inner layer rotational flow hole pipe 2 'and the gap between the mixed urea and the bottom blocking cover 3', the urea is further crushed and mixed, and finally the urea flows out from the opening 5 'on the outer layer hole pipe 4'.
The following problems were found after use: 1) urea deposits appear on the left side of the bottom of the inner layer rotational flow hole pipe 2' in a urea crystallization test and an emission calibration test; 2) the openings 5 'on the outer layer pore pipe 4' are circumferentially and uniformly distributed, so that the flow field on the end surface of the carrier and the distribution uniformity of ammonia are difficult to meet the requirements; 3) the connection area of the inner layer rotational flow hole pipe 2 'and the nozzle seat 1' has no air flow to directly flow through, a low-pressure retention area is formed, urea is easily deposited at the low-pressure retention area, and urea crystallization at the nozzle is caused. Therefore, further optimization is required.
Disclosure of Invention
The invention aims to provide a wall-flow vortex mixer, which optimizes the original mixer on the premise of not changing the shape boundary, improves the uniformity of an internal flow field, increases the mixing distance of urea and waste gas, improves the mixing effect, eliminates a low-pressure retention zone and avoids urea crystallization.
In order to achieve the purpose, the invention adopts the following technical scheme:
a wall flow vortex mixer comprises a shell, an inner vortex tube and an outer vortex tube, wherein a partition plate is arranged in the shell and divides an inner cavity of the shell into a first cavity and a second cavity, the first cavity is communicated with an air inlet end of the shell, the second cavity is communicated with an air outlet end of the shell, the inner vortex tube penetrates through the first cavity from the outside of the shell and extends into the second cavity, a first end of the outer vortex tube is fixed at one side of the second cavity of the partition plate, a first plug cover is arranged on a second end of the outer vortex tube, a first air hole is formed in a tube body of the outer vortex tube, a first end of the inner vortex tube extends into the outer vortex tube, a second plug cover is arranged on the second end of the inner vortex tube, a nozzle seat is arranged on the second plug cover, vortex plates are evenly distributed on the tube body of the inner vortex tube in the first cavity in the circumferential direction, a second air hole is formed in the tube body in the second cavity, and air flow in the shell enters the inner vortex tube, the first end port of interior vortex pipe is close to first blanking cover and forms the gap, and the second stoma opening is located the first end of interior vortex pipe, and only offers on the side of giving vent to anger the end towards the casing, and the first stoma opening is located the first end of outer vortex pipe, and only offers on the side of the end of giving vent to anger of casing dorsad, and the second blanking cover sinks under the casing in, and the spinning disk extends to second blanking cover department.
In particular, the connection to the second cap on the nozzle holder is provided with a conical shape.
In particular, the bottom of the first closure is raised towards the end of the inner swirl tube.
In particular, the first air hole opening is arranged as a square window and is symmetrical relative to the center of the air outlet end of the shell.
Particularly, the second air hole is provided with a plurality of circular holes and is symmetrical relative to the center of the air outlet end of the shell.
In conclusion, compared with the prior art, the wall-flow vortex mixer has the advantages that the air hole of the inner vortex pipe and the air hole of the outer vortex pipe in the existing mixer are optimally designed, the problems of uneven flow field, short mixing distance and easy crystallization caused by circumferential hole opening are solved, in addition, the nozzle is designed to sink, a low-pressure retention zone is eliminated, the crystallization risk is further reduced, and the mixing effect of urea and waste gas, the decomposition of the waste gas and the index of the conversion efficiency of carriers are ensured to meet the requirements.
Drawings
FIG. 1 is a schematic diagram of a wall-flow swirl mixer provided by an embodiment of the invention;
FIG. 2 is a schematic diagram of a conventional urea injection double tube mixer.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
Referring to fig. 1, the present embodiment provides a wall-flow vortex mixer, which mainly includes a housing 1, an inner cyclone tube 2 and an outer cyclone tube 3.
Be provided with baffle 4 in the casing 1, divide into first cavity 5 and second cavity 6 with the inner chamber of casing 1, first cavity 5 and the inlet end intercommunication of casing 1, second cavity 6 and the end intercommunication of giving vent to anger of casing 1.
The first end of the outer cyclone tube 3 is fixed on one side of the second cavity 6 of the partition plate 4, the second end is provided with a first plug cover 7, and the body of the outer cyclone tube 3 is provided with a first air hole opening 8.
Especially, the first air hole 8 is located at the first end of the outer cyclone tube 3 and is only opened on the side surface back to the air outlet end of the housing 1, and here, the first air hole 8 is configured as a square window and is symmetrical with respect to the center of the air outlet end of the housing 1.
Especially, the first end port of interior cyclone tube 2 is close to first blanking cover 7 and forms the gap, and the bottom of first blanking cover 7 is protruding to the tip of interior cyclone tube 2 to reduce the degree of depth of first blanking cover 7, improve air velocity, avoid urea and exhaust gas mixture can't flow in outer cyclone tube 3 completely, cause the bottom of first blanking cover 7 to form the urea crystallization.
Especially, second blanking cover 9 sinks into casing 1 down, and spinning disk 11 extends to second blanking cover 9 department, and sets up to the toper with the connecting portion of second blanking cover 9 on the nozzle holder 10 for the air current can directly sweep the urea liquid outlet, effectively avoids this region to form the low pressure and detains the district, further eliminates the urea crystallization.
Especially, second gas pocket 12 is located the first end of interior cyclone 2, and only offers on the side towards casing 1 end of giving vent to anger, and second gas pocket 12 here sets up to a plurality of circular port, and gives vent to anger the central symmetry of end relative casing 1.
Airflow in the shell 1 enters the inner cyclone tube 2 through the cyclone sheet 11 to form cyclone, so that the airflow is fully mixed with urea solution sprayed out of the nozzle seat 10, enters the outer cyclone tube 3 through the second air hole 12, and finally returns to the shell 1 through the first air hole 8, so that the urea solution and waste gas are crushed and mixed. The design optimization of the first air hole 8 and the second air hole 12 increases the mixing distance of the urea and the waste gas, and is helpful for forming a vortex of the mixture of the urea and the waste gas, accelerating the crushing and decomposition of the urea and fully mixing the urea.
In conclusion, the wall flow vortex mixer optimally designs the air hole of the inner vortex pipe and the air hole of the outer vortex pipe in the existing mixer, solves the problems of uneven flow field, short mixing distance and easy crystallization caused by circumferential hole opening, and additionally, the nozzle is designed to sink, so that a low-pressure retention zone is eliminated, the crystallization risk is further reduced, and the mixing effect of urea and waste gas, the decomposition of the waste gas and the index of the conversion efficiency of carriers meet the requirements are ensured.
The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but is capable of various modifications and changes without departing from the spirit and scope of the invention, which are intended to be within the scope of the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A wall flow vortex mixer comprises a shell, an inner vortex tube and an outer vortex tube, wherein a partition plate is arranged in the shell and divides an inner cavity of the shell into a first cavity and a second cavity, the first cavity is communicated with an air inlet end of the shell, the second cavity is communicated with an air outlet end of the shell, the inner vortex tube penetrates through the first cavity from the outside of the shell and extends into the second cavity, a first end of the outer vortex tube is fixed at one side of the second cavity of the partition plate, a second end of the outer vortex tube is provided with a first blocking cover, a first air hole is formed in a tube body of the outer vortex tube, a first end of the inner vortex tube extends into the outer vortex tube, a second blocking cover is arranged at the second end of the inner vortex tube, a nozzle seat is arranged on the second blocking cover, vortex sheets are uniformly distributed on the tube body of the inner vortex tube in the first cavity in the circumferential direction, and a second air hole is formed in the tube body of the second cavity, the air current in the casing passes through form the whirl in the whirl pipe in the spinning disk enters, its characterized in that, the first end port of interior whirl pipe is close to first blanking cover and forms the gap, the second gas pocket is located the first end of interior whirl pipe, and only sets up on the side of giving vent to anger the end towards the casing, first gas pocket is located the first end of outer whirl pipe, and only sets up on the side of the end of giving vent to anger the casing dorsad, the second blanking cover sinks in the casing down, the whirl plate extends to second blanking cover department.
2. A wall-flow scroll mixer according to claim 1, wherein: and the connecting part of the nozzle seat and the second blocking cover is conical.
3. A wall-flow scroll mixer according to claim 1, wherein: the bottom of the first blocking cover protrudes towards the end part of the inner cyclone tube.
4. A wall-flow scroll mixer according to claim 1, wherein: the first air hole opening is arranged to be a square window and is symmetrical relative to the center of the air outlet end of the shell.
5. A wall-flow scroll mixer according to claim 1, wherein: the second gas pocket sets up to a plurality of circular port, and gives vent to anger the central symmetry of end relative casing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110181281.5A CN113027573B (en) | 2021-02-08 | 2021-02-08 | Wall flow vortex mixer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110181281.5A CN113027573B (en) | 2021-02-08 | 2021-02-08 | Wall flow vortex mixer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113027573A true CN113027573A (en) | 2021-06-25 |
| CN113027573B CN113027573B (en) | 2024-06-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110181281.5A Active CN113027573B (en) | 2021-02-08 | 2021-02-08 | Wall flow vortex mixer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113027573B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018095141A1 (en) * | 2016-11-25 | 2018-05-31 | 天纳克（苏州）排放系统有限公司 | Exhaust aftertreatment device |
| CN108397262A (en) * | 2018-02-12 | 2018-08-14 | 无锡威孚力达催化净化器有限责任公司 | Light-duty diesel vehicle oblique cutting eddy flow mix aperture pipe post-processes encapsulating structure |
| CN109488426A (en) * | 2019-01-28 | 2019-03-19 | 凯龙高科技股份有限公司 | A kind of Double layer spiral flow vane type urea injection mixed cell |
| CN109653849A (en) * | 2019-01-28 | 2019-04-19 | 凯龙高科技股份有限公司 | A kind of urea injection bimetallic tube mixer for diesel engine vent gas post-processing |
| CN110359989A (en) * | 2019-08-26 | 2019-10-22 | 凯龙高科技股份有限公司 | A kind of performance chamber mixer for diesel engine vent gas processing |
| CN215057679U (en) * | 2021-02-08 | 2021-12-07 | 凯龙高科技股份有限公司 | Wall flow vortex mixer |
-
2021
- 2021-02-08 CN CN202110181281.5A patent/CN113027573B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018095141A1 (en) * | 2016-11-25 | 2018-05-31 | 天纳克（苏州）排放系统有限公司 | Exhaust aftertreatment device |
| CN108397262A (en) * | 2018-02-12 | 2018-08-14 | 无锡威孚力达催化净化器有限责任公司 | Light-duty diesel vehicle oblique cutting eddy flow mix aperture pipe post-processes encapsulating structure |
| CN109488426A (en) * | 2019-01-28 | 2019-03-19 | 凯龙高科技股份有限公司 | A kind of Double layer spiral flow vane type urea injection mixed cell |
| CN109653849A (en) * | 2019-01-28 | 2019-04-19 | 凯龙高科技股份有限公司 | A kind of urea injection bimetallic tube mixer for diesel engine vent gas post-processing |
| WO2020155834A1 (en) * | 2019-01-28 | 2020-08-06 | 凯龙高科技股份有限公司 | Swirl vane-type urea injection mixing apparatus |
| CN110359989A (en) * | 2019-08-26 | 2019-10-22 | 凯龙高科技股份有限公司 | A kind of performance chamber mixer for diesel engine vent gas processing |
| CN215057679U (en) * | 2021-02-08 | 2021-12-07 | 凯龙高科技股份有限公司 | Wall flow vortex mixer |
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| Publication number | Publication date |
|---|---|
| CN113027573B (en) | 2024-06-21 |
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