CN118110585A - SCR aftertreatment urea mixing arrangement - Google Patents
SCR aftertreatment urea mixing arrangement Download PDFInfo
- Publication number
- CN118110585A CN118110585A CN202410031139.6A CN202410031139A CN118110585A CN 118110585 A CN118110585 A CN 118110585A CN 202410031139 A CN202410031139 A CN 202410031139A CN 118110585 A CN118110585 A CN 118110585A
- Authority
- CN
- China
- Prior art keywords
- urea
- mixing
- arc
- shaped
- mixing pipe
- 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.)
- Pending
Links
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 82
- 239000004202 carbamide Substances 0.000 title claims abstract description 82
- 238000002156 mixing Methods 0.000 title claims abstract description 45
- 230000007246 mechanism Effects 0.000 claims abstract description 20
- 238000002347 injection Methods 0.000 claims abstract description 19
- 239000007924 injection Substances 0.000 claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 abstract description 4
- 230000009467 reduction Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 11
- 238000002425 crystallisation Methods 0.000 description 5
- 230000008025 crystallization Effects 0.000 description 5
- 239000000243 solution Substances 0.000 description 4
- 239000002912 waste gas Substances 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000000889 atomisation Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000003137 locomotive effect Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000003068 static effect Effects 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
- F01N3/18—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]
- F01N3/208—Control of selective catalytic reduction [SCR], e.g. dosing of reducing agent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C19/00—Other disintegrating devices or methods
- B02C19/0012—Devices for disintegrating materials by collision of these materials against a breaking surface or breaking body and/or by friction between the material particles (also for grain)
- B02C19/0043—Devices for disintegrating materials by collision of these materials against a breaking surface or breaking body and/or by friction between the material particles (also for grain) the materials to be pulverised being projected against a breaking surface or breaking body by a pressurised fluid
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention provides an SCR post-treatment urea mixing device, which belongs to the technical field of SCR post-treatment and comprises: the urea crushing device comprises a mixing pipe, a urea crushing structure and an arc-shaped mixed flow mechanism, wherein the mixing pipe is provided with an air inlet, an air outlet and a urea jet opening; the urea crushing structure is arranged inside the mixing pipe and corresponds to the urea injection port, so that the urea injection assembly is positioned on the urea injection path; the arc mixed flow mechanism is arranged inside the mixing pipe and connected with the mixing pipe, the arc mixed flow mechanism comprises strip-shaped through holes, the strip-shaped through holes are uniformly distributed along the inner wall, the strip-shaped through holes are used for disturbing air flow, so that air flow is disturbed, the air flow is fully and uniformly mixed, the mixing uniformity of NH3 is greatly improved, the efficient conversion and reduction of NOX in the SCR mixer are guaranteed, and finally the NOX emission reaches the standard.
Description
Technical Field
The invention belongs to the technical field of SCR aftertreatment, and particularly relates to an SCR aftertreatment urea mixing device.
Background
With the increasing emphasis of the national environmental protection and the implementation of national VI emission regulations of diesel locomotives, urea is widely adopted in a thermal tail gas post-treatment system of the diesel internal combustion engine to reduce and eliminate NOX in the thermal tail gas, namely SCR technology; the SCR technology is a technology for realizing tail gas aftertreatment and purification by applying a selective catalytic reduction chemical principle, and can effectively reduce the emission of NOx of a diesel engine and reach the emission standard. The urea aqueous solution needs to be hydrolyzed after being sprayed in the working process of the SCR treatment system, and ammonia gas is generated to react with NOX in hot tail gas exhausted by the internal combustion engine. Hydrolysis of urea is mainly realized through a static SCR mixer at present, but the risk of urea crystallization is higher in the use process of the SCR mixer at present, so that the problems of increased fuel consumption of the whole vehicle, reduced conversion efficiency of post-treatment NOx and the like are caused; accordingly, one skilled in the art would provide an automotive aftertreatment SCR mixer to address the problems set forth in the background above.
Disclosure of Invention
The invention provides an SCR post-treatment urea mixing device, which aims at the problems in the prior art and comprises: the urea crushing device comprises a mixing pipe, a urea crushing structure and an arc-shaped mixed flow mechanism, wherein the mixing pipe is provided with an air inlet, an air outlet and a urea jet opening;
The urea crushing structure is arranged inside the mixing pipe and corresponds to the urea injection port, so that the urea injection assembly is positioned on the urea injection path;
The arc-shaped mixed flow mechanism is arranged inside the mixing pipe and connected with the mixing pipe, and comprises strip-shaped through holes which are uniformly distributed along the inner wall and used for disturbing air flow, so that the air forms turbulent flow and is fully and uniformly mixed.
Further, the arc-shaped mixed flow mechanism and the inner wall of the mixing pipe jointly form an arc-shaped mixed flow channel, and the arc-shaped mixed flow channel is positioned on the downstream side of the urea crushing structure.
Further, the urea crushing structure comprises an annular pipe and a crushing plate, wherein the crushing plate is arranged in the annular pipe, and through holes are formed in the crushing plate and can crush urea; the crushing plate can greatly improve the atomization level of urea and reduce the risk of urea crystallization.
Compared with the prior art, the invention has the advantages and positive effects that:
According to the invention, the urea crushing structure is arranged on the urea injection path, so that urea solution injected from the urea injection port impacts the urea crushing structure, and part of urea liquid drops are rebound and crushed and then mixed with high-temperature waste gas/tail gas, and enter the arc-shaped mixed flow mechanism forwards under the action of air flow; part of urea liquid drops are deposited on the surface of the urea crushing structure, are purged and stripped by the airflow and enter an arc-shaped mixed flow mechanism on the downstream side of the flow path together with the airflow. Under the guide of arc mixed flow mechanism, the mixed gas that contains urea flows along arc mixed flow path in the arc mixed flow channel that is located urea broken structure downstream side for the mixed gas flows through long enough route in the blender, so that it has sufficient time to carry out intensive mixing, evaporation decomposition to guarantee urea and waste gas, thereby avoid blender urea crystallization problem, simultaneously greatly promote NH 3's misce bene, guarantee the high-efficient conversion reduction of NOX in the SCR blender, finally realize NOX emission and reach the standard.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it will be obvious that the drawings in the following description are some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art.
FIG. 1 is a schematic diagram of an SCR aftertreatment urea mixing device of the present disclosure;
FIG. 2 is a plan view of the inside of the SCR aftertreatment urea mixing device of the present invention;
In the above figures, 1, a mixing tube; 2. a urea injection port; 3. an arc-shaped mixed flow mechanism; 4. a urea crushing structure; 301. a strip-shaped through hole; 401. and (3) crushing the plate.
Detailed Description
In order that the above objects, features and advantages of the application will be more clearly understood, a further description of the application will be rendered by reference to the appended drawings and examples. It should be noted that, without conflict, the embodiments of the present application and features in the embodiments may be combined with each other.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced otherwise than as described herein, and therefore the present invention is not limited to the specific embodiments of the disclosure that follow.
Embodiment 1 as shown in fig. 1 and 2, the present application provides an SCR aftertreatment urea mixing device, comprising: a mixing pipe 1, the mixing pipe 1 being provided with an air inlet, an air outlet, and a urea injection port 2, the air inlet and the air outlet being provided at both ends of the mixing pipe in an axial direction, respectively, the urea injection port 2 being provided on a radial side wall of the mixing pipe 1 and being closer to the air inlet than the air outlet;
A urea crushing structure 4, the urea crushing structure 4 being disposed inside the mixing pipe 1 and corresponding to the urea injection port 2 such that the urea injection assembly 4 is located on the urea injection path; the urea crushing structure 4 comprises an annular pipe and a crushing plate, wherein the crushing plate 401 is arranged in the annular pipe, and through holes are formed in the crushing plate 401 and can crush urea; the crushing plate 401 can greatly improve the atomization level of urea and reduce the risk of urea crystallization;
The arc mixes flow mechanism 3, the arc mixes flow mechanism 3 sets up inside mixing tube 1 and be connected with mixing tube 1, and arc mixes flow mechanism 3 includes strip through-hole 301, and strip through-hole 301 evenly lays along the inner wall, and strip through-hole is used for disturbing the air current for the gas forms the vortex, thereby intensive mixing is even, and arc mixes flow mechanism 3 and mixing tube 1's inner wall jointly form arc and mix the flow channel, and arc mixes the flow channel and is located urea broken structure's downstream side.
The urea crushing structure 4 is arranged on the urea injection path, so that urea solution injected from the urea injection port 2 impacts the urea crushing structure 4, and part of urea liquid drops are rebound crushed and then mixed with high-temperature waste gas/tail gas, and enter the arc-shaped mixed flow mechanism 3 forwards under the action of air flow; part of the urea droplets are deposited on the surface of the urea crushing structure, and then are purged and stripped by the air flow and enter the arc-shaped flow mixing mechanism 3 on the downstream side of the flow path together with the air flow. Under the guidance of the arc-shaped mixed flow mechanism 3, the mixed gas containing urea rotationally flows in the arc-shaped mixed flow channel 4 positioned at the downstream side of the urea crushing structure 4 along the arc-shaped mixed flow path, so that the mixed gas flows in a sufficiently long path in the mixer to ensure that the urea and the waste gas have sufficient time to be fully mixed and evaporated and decomposed, thereby avoiding the problem of urea crystallization of the mixer, greatly improving the mixing uniformity of NH3, ensuring the efficient conversion and reduction of NOX in the SCR mixer, and finally realizing that the NOX emission reaches the standard.
The present invention is not limited to the above-mentioned embodiments, and any equivalent embodiments which can be changed or modified by the technical content disclosed above can be applied to other fields, but any simple modification, equivalent changes and modification made to the above-mentioned embodiments according to the technical substance of the present invention will still fall within the protection scope of the technical solution of the present invention.
Claims (3)
1. An SCR aftertreatment urea mixing device, comprising: the urea crushing device comprises a mixing pipe, a urea crushing structure and an arc-shaped mixed flow mechanism, wherein the mixing pipe is provided with an air inlet, an air outlet and a urea jet opening;
The urea crushing structure is arranged inside the mixing pipe and corresponds to the urea injection port, so that the urea injection assembly is positioned on the urea injection path;
The arc-shaped mixed flow mechanism is arranged inside the mixing pipe and connected with the mixing pipe, and comprises strip-shaped through holes which are uniformly distributed along the inner wall and used for disturbing air flow, so that the air forms turbulent flow and is fully and uniformly mixed.
2. The SCR aftertreatment urea mixing device of claim 1, wherein the arcuate mixing mechanism and the inner wall of the mixing tube cooperate to form an arcuate mixing flow path, the arcuate mixing flow path being located on a downstream side of the urea crushing structure.
3. The device for mixing urea after SCR aftertreatment according to claim 1, wherein the urea crushing structure comprises an annular pipe and a crushing plate, the crushing plate is installed in the annular pipe, and through holes are formed in the crushing plate and can crush urea.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410031139.6A CN118110585A (en) | 2024-01-09 | 2024-01-09 | SCR aftertreatment urea mixing arrangement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410031139.6A CN118110585A (en) | 2024-01-09 | 2024-01-09 | SCR aftertreatment urea mixing arrangement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118110585A true CN118110585A (en) | 2024-05-31 |
Family
ID=91207772
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410031139.6A Pending CN118110585A (en) | 2024-01-09 | 2024-01-09 | SCR aftertreatment urea mixing arrangement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN118110585A (en) |
-
2024
- 2024-01-09 CN CN202410031139.6A patent/CN118110585A/en active Pending
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