CN115030803B - Mixer and diesel engine - Google Patents
Mixer and diesel engine Download PDFInfo
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- CN115030803B CN115030803B CN202210741593.1A CN202210741593A CN115030803B CN 115030803 B CN115030803 B CN 115030803B CN 202210741593 A CN202210741593 A CN 202210741593A CN 115030803 B CN115030803 B CN 115030803B
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- swirl
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- 238000002156 mixing Methods 0.000 claims abstract description 234
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 74
- 239000004202 carbamide Substances 0.000 claims abstract description 74
- 230000007704 transition Effects 0.000 claims description 3
- 238000002425 crystallisation Methods 0.000 abstract description 9
- 230000008025 crystallization Effects 0.000 abstract description 9
- 230000003116 impacting effect Effects 0.000 abstract description 3
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 100
- 239000007921 spray Substances 0.000 description 19
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 9
- 239000000203 mixture Substances 0.000 description 6
- 238000005507 spraying Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 210000002268 wool Anatomy 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000002912 waste gas Substances 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]
-
- 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
-
- 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
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- 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)
Abstract
The embodiment of the invention discloses a mixer and a diesel engine, which comprises: a mixer outer tube having a mixer sidewall such that the mixer outer tube forms a flow channel; a nozzle base is arranged on the side wall of the mixer; the front baffle is arranged at the first end of the outer pipe of the mixer, and is provided with an air inlet for air flow to enter the outer pipe of the mixer; the swirl plate is arranged at the second end of the outer tube of the mixer, swirl holes are formed in the swirl plate, and a swirl guide plate for forming rotary airflow is arranged on one side of the swirl plate corresponding to each swirl hole; the mixing component is arranged in the outer tube of the mixer and is positioned between the front baffle and the cyclone plate, the mixing component is provided with a mixing plate used for impacting air flow, and a diversion hole is formed in the mixing plate. According to the mixer provided by the invention, the tail gas enters the mixer through the air inlet formed in the front baffle plate and simultaneously hits the mixing plate, so that the mixing and decomposing time of the tail gas and urea is prolonged, and urea crystallization is avoided.
Description
Technical Field
The invention relates to the technical field of tail gas treatment equipment, in particular to a mixer and a diesel engine.
Background
At present, as the emission standard of the tail gas pollutants of the national diesel vehicle is developed to the VI stage, the emission standard has stricter definition on the tail gas pollutants. Selective catalytic reduction (Selective Catalytic Reduction, SCR) is a technology that can eliminate nitrogen oxides in diesel exhaust. The principle of the SCR technology is that ammonia gas generated by urea decomposition is utilized and mixed with tail gas in an SCR mixer, the mixed tail gas enters an SCR reactor, and under the action of a catalyst, the ammonia gas reacts with nitrogen oxides in the tail gas to generate nitrogen and water, so that the nitrogen oxides in the exhaust gas are reduced, the tail gas is treated to meet the emission standard of state VI, and the uniformity of the mixing of the tail gas and the ammonia gas is vital in the tail gas treatment process of an engine.
In the prior art, SCR mixers are typically composed of swirl tubes, swirl tube baffles, steel wool, and outer layer tubes. Urea is sprayed into the SCR mixer through a urea nozzle arranged on the wall of the outer-layer pipe and is mixed with tail gas entering the cyclone pipe, air flow after mixing the urea and the tail gas can cyclone along the cyclone direction of the cyclone pipe, and the urea enters the SCR reactor through steel wool, so that the problem of urea crystallization is serious due to shorter mixing time of the urea and the tail gas.
Therefore, how to improve the mixing uniformity between urea spray and exhaust gas and reduce urea crystallization is a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention aims to provide a mixer for improving mixing uniformity between urea spray and exhaust gas and reducing urea crystallization.
Another object of the present invention is to provide a diesel engine having the above mixer.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a mixer, comprising:
a mixer outer tube having a mixer sidewall such that the mixer outer tube forms a flow passage for a gas stream therethrough; a nozzle base for installing a urea nozzle is arranged on the side wall of the mixer;
the front baffle is arranged at the first end of the outer pipe of the mixer, and an air inlet for air flow to enter the outer pipe of the mixer is formed in the front baffle;
the swirl plate is arranged at the second end of the outer tube of the mixer, swirl holes are formed in the swirl plate, and a swirl guide plate for forming rotary airflow is arranged on one side of the swirl plate corresponding to each swirl hole;
the mixing component is arranged in the outer pipe of the mixer and positioned between the front baffle and the cyclone plate, and is provided with a mixing plate used for impacting air flow, and a diversion hole is formed in the mixing plate.
Optionally, in the above mixer, the front baffle includes a middle region and a first region and a second region respectively located at two ends of the middle region;
the distance between the first area and the cyclone plate is greater than that between the second area and the cyclone plate, and the middle area is an inclined surface area in which the first area is in inclined transition to the second area;
the nozzle base is arranged on the side wall of the mixer close to the first area;
the first region, the second region and the middle region are all provided with the air inlets.
Optionally, in the above mixer, a baffle is respectively disposed at the air inlet positions corresponding to the first region and the second region, so that the air flow hits the mixing assembly along the baffle.
Optionally, in the above mixer, the baffle is stamped from the front baffle, one end of the baffle is connected with the side wall of the air inlet, and the baffle is bent along one end of the baffle, so that the other end of the baffle is tilted and tilted in a direction away from the front baffle.
Optionally, in the above mixer, the swirl guide plate includes an outer swirl guide plate and an inner swirl guide plate; the corresponding position of the outer swirl guide plate is provided with an outer swirl hole for forming a first rotary air flow; the inner rotating guide plate is provided with an inner rotating hole for forming a second rotating air flow at a corresponding position; the first rotating airflow is rotated in the opposite direction to the second rotating airflow.
Optionally, in the above mixer, the swirl guide plate is punched by the swirl plate, one end of the swirl guide plate is connected with a side wall of the swirl hole, and the swirl guide plate is bent along one end of the swirl guide plate, so that the other end of the swirl guide plate is tilted and tilted in a direction away from the swirl plate.
Optionally, in the above mixer, the mixing plate includes a middle mixing plate and a first mixing plate and a second mixing plate respectively located at two sides of the middle mixing plate; the distance between the first mixing plate and the cyclone plate is larger than the distance between the second mixing plate and the cyclone plate, the first mixing plate is positioned on one side of the first area of the front baffle, and the second mixing plate is positioned on one side of the second area of the front baffle; the middle mixing plate is arranged at a position between the first mixing plate and the second mixing plate, and the middle mixing plate is provided with a plurality of diversion holes.
Optionally, in the above mixer, the first mixing plate and the second mixing plate each include a mixed flow area located in the middle and a swirl area located at two ends of the mixed flow area, the mixed flow area is of a curved surface structure, and the mixed flow area is provided with a plurality of diversion holes.
Optionally, in the above mixer, the mixed flow area of the first mixing plate and the second mixing plate protrudes in a direction away from the middle mixing plate.
Optionally, in the above mixer, the swirl area of the first mixing plate and the swirl area of the second mixing plate are provided with a plurality of diversion ports, and a diversion fin is disposed on the first mixing plate and the second mixing plate corresponding to each location of the diversion port, so that a rotating airflow is formed when the airflow passes through the diversion ports.
Optionally, in the above mixer, the nozzle base is located on the mixer sidewall corresponding to a mixing flow area of the first mixing plate.
Optionally, in the above mixer, a plurality of sensor mounting seats for mounting temperature sensors are further provided on the side wall of the mixer outer tube near the first end position of the mixer outer tube.
Optionally, in the above mixer, the front baffle plate is provided with a sensor mounting hole corresponding to the sensor mounting seat.
A diesel engine comprising a mixer as claimed in any one of the preceding claims.
The invention provides a mixer, tail gas enters the mixer through an air inlet formed on a front baffle plate, and collides with a mixing plate, meanwhile urea is sprayed into the mixer through a urea nozzle on the side wall of the mixer, and the urea spray decomposes NH under the condition of high temperature of the tail gas 3 ，NH 3 Fully mixed with the tail gas and discharged from the cyclone holes arranged on the cyclone plate to form a rotary airflow. As the tail gas enters the mixer from the air inlet and hits the mixing plate in the mixing component, the mixing and decomposing time of the tail gas and urea is increased, so that NH 3 And the mixture with the tail gas is more uniform. When NH 3 When the tail gas is discharged from the cyclone plate, a rotary airflow is formed, and NH is further increased 3 Uniformity of mixing with the tail gas.
Compared with the SCR mixer in the prior art, the tail gas enters the mixer from the air inlet of the front baffle plate, hits the mixing plate in the mixing component and is mixed with urea at the same time, so that the mixing and decomposing time of the tail gas and the urea is increased, and NH is generated after the urea is decomposed 3 And the tail gas is discharged out of the mixer through the cyclone plate in the form of rotating air flow, and NH is made in the discharging process 3 Is continuously mixed with the tail gas, and further increases NH 3 Mixing time with the tail gas. The mixer provided by the invention has the advantages that the tail gas enters the mixer through the air inlet formed on the front baffle plate and simultaneously hits the mixing plate, so that the mixing and decomposing time of the tail gas and urea is prolonged, the tail gas is discharged through the cyclone plate, and the NH is further increased 3 Mixing time with tail gas due to NH 3 And tail ofLong gas mixing time and excellent mixing uniformity, and effectively avoids urea crystallization.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a perspective view of a mixer provided in an embodiment of the invention;
FIG. 2 is a front view of a mixer provided in an embodiment of the invention;
FIG. 3 is a schematic view of the structure of a front baffle of a mixer according to an embodiment of the present invention;
FIG. 4 is a schematic view of a swirl plate of a mixer according to an embodiment of the present invention;
FIG. 5 is an enlarged view of a mixing assembly in a mixer provided in an embodiment of the invention;
FIG. 6 is a schematic view of a first mixing plate structure of a mixing assembly in the mixer provided in the embodiment of FIG. 5;
FIG. 7 is a schematic view of a middle mixing plate structure of a mixing assembly in the mixer provided in the embodiment of FIG. 5;
fig. 8 is a schematic view of a second mixing plate structure of the mixing assembly in the mixer provided in the embodiment of fig. 5.
Wherein 100 is a mixer outer tube, 101 is a nozzle base, 102 is a sensor mounting seat, 103 is a connecting flange, 200 is a front baffle, 201 is a guide plate, 202 is an air inlet, 203 is a sensor mounting hole, 300 is a swirl plate, 301 is an outer swirl plate, 302 is an outer swirl plate, 303 is an inner swirl plate, 304 is an inner swirl plate, 400 is a mixing assembly, 401 is a first mixing plate, 402 is a second mixing plate, 403 is a middle mixing plate, 404 is a guide hole, 405 is a guide fin, and 406 is a guide port.
Detailed Description
The invention aims at providing a mixer for improving the mixing uniformity between urea spray and waste gas and reducing urea crystallization.
Another core of the present invention is to provide a diesel engine having the above mixer.
Hereinafter, embodiments will be described with reference to the drawings. Furthermore, the embodiments shown below do not limit the summary of the invention described in the claims. The whole contents of the constitution shown in the following examples are not limited to the solution of the invention described in the claims.
As shown in fig. 1, an embodiment of the present invention discloses a mixer including a mixer outer tube 100, a front baffle 200, a swirl plate 300, and a mixing assembly 400.
Wherein the outer mixer tube 100 has mixer side walls such that the outer mixer tube 100 forms a flow path for the air flow therethrough, the wall thickness of the mixer side walls being determined by one skilled in the art in view of the actual situation. As will be appreciated by those skilled in the art, the thicker the mixer sidewall, the better the thermal insulation, and the greater the dead weight, with a corresponding increase in cost; the thinner the side wall of the mixer is, the worse the heat preservation performance is, the lower the dead weight is, the corresponding cost is reduced, and the wall thickness of the side wall of the mixer can be designed according to the use scene of the diesel engine.
Further, as shown in fig. 2, in order to mix urea with exhaust gas by spraying in the mixer, a nozzle base 101 for mounting a urea nozzle is provided on a side wall of the mixer. In a specific embodiment, the nozzle base 101 is disposed near the air inlet of the mixer outer tube 100. It is to be noted that the close to the air inlet is favorable for fully mixing the tail gas and the urea, and ensures the mixing and decomposing time of the tail gas and the urea. Of course, the nozzle base 101 may also be disposed at a position far away from the air inlet of the outer tube 100 of the mixer, so that the mixing and decomposing time of the tail gas and the urea is shortened, and the tail gas and the urea cannot be fully mixed.
Further, as shown in fig. 3, the front baffle 200 is disposed at a first end of the outer mixer tube 100, and it should be noted that the first end refers to an air inlet end of the outer mixer tube 100, and the front baffle 200 is spaced from the air inlet of the outer mixer tube 100 for connecting with an upstream device. In order to ensure that the tail gas can smoothly enter the mixer to be mixed with the urea, an air inlet 202 for air flow to enter the outer tube 100 of the mixer is formed in the front baffle 200, and when the tail gas passes from upstream equipment to the front baffle 200, the tail gas enters the outer tube 100 of the mixer through the air inlet 202 to be mixed with the urea.
Further, as shown in fig. 4, the swirl plate 300 is disposed at a second end of the outer mixer tube 100, and it should be noted that the second end refers to an air outlet end of the outer mixer tube 100, and the swirl plate 300 is spaced from the air outlet of the outer mixer tube 100 for connecting downstream equipment. To ensure tail gas and NH 3 The mixing is more fully and uniformly carried out during the discharging, the swirl plate 300 is provided with swirl holes, and one side of the swirl plate 300 corresponding to each swirl hole is provided with a swirl guide plate for forming the rotary airflow. One side refers to a direction away from the swirl plate 300, and may be directed toward the interior cavity of the outer mixer tube 100, or may be directed away from the interior cavity of the outer mixer tube 100. When tail gas and NH 3 As the mixed gas of (a) passes through the swirl plate 300, the mixer is discharged from the swirl holes due to the guidance of the swirl guide plate, thereby forming a swirling gas flow.
Further, in order to ensure the mixing and decomposing time of the urea and the tail gas, the urea and the tail gas are mixed more fully and uniformly, and the urea is prevented from crystallizing, as shown in fig. 5, a mixing assembly 400 is disposed in the outer tube 100 of the mixer, the mixing assembly 400 is disposed between the front baffle 200 and the cyclone plate 300, the mixing assembly 400 has a mixing plate for impacting with the air flow, and a diversion hole 404 is formed in the mixing plate. The nozzle base 101 is located at a position between the front baffle 200 and the swirl plate 300 for injecting urea spray through urea nozzles onto the mixing assembly 400.
In one embodiment, as the exhaust gas enters from the inlet 202 of the front baffle 200, impinges on a mixing plate in the mixing assembly 400 and flows out of a flow guide hole 404 provided in the mixing plate and mixes with the urea spray from the urea nozzle, which breaks down to produce NH under the high temperature conditions of the exhaust gas 3 ，NH 3 Is fully mixed with the tail gas and discharged by the cyclone plate 300 to form a rotationThe gas stream enters the downstream equipment.
The invention provides a mixer, tail gas enters the mixer through an air inlet 202 arranged on a front baffle 200, and impacts a mixing plate, meanwhile urea is sprayed into the mixer through a urea nozzle on the side wall of the mixer, and the urea spray decomposes NH under the condition of high temperature of the tail gas 3 ，NH 3 Is fully mixed with the tail gas and is discharged from the cyclone holes arranged on the cyclone plate 300 to form a rotary airflow. As the exhaust gas enters the mixer from the air inlet and hits the mixing plate in the mixing assembly 400, the mixing and decomposing time of the exhaust gas and urea is increased, so that NH 3 And the mixture with the tail gas is more uniform. When NH 3 And the tail gas is discharged from the cyclone plate 300 to form a rotating airflow, thereby further increasing NH 3 Uniformity of mixing with the tail gas.
Compared with the SCR mixer in the prior art, the tail gas enters the mixer from the air inlet 202 of the front baffle 200, hits the mixing plate in the mixing assembly 400 and is mixed with urea at the same time, so that the mixing and decomposing time of the tail gas and the urea is increased, and NH generated after the urea is decomposed 3 And the tail gas are discharged from the mixer through the cyclone plate 300 in the form of a rotating air flow, and NH is caused during the discharging process 3 Is continuously mixed with the tail gas, and further increases NH 3 Mixing time with the tail gas. The mixer provided by the invention has the advantages that the tail gas enters the mixer through the air inlet 202 formed on the front baffle 200 and simultaneously hits the mixing plate, so that the mixing and decomposing time of the tail gas and urea is increased, the tail gas is discharged from the cyclone plate 300, and the NH is further increased 3 Mixing time with tail gas due to NH 3 Long mixing time with tail gas and excellent mixing uniformity, and effectively avoids urea crystallization.
Further, as shown in fig. 3, the front baffle 200 is divided into a middle region and first and second regions respectively located at both ends of the middle region for convenience of understanding, and the first region, the second region and the middle region are provided with air inlets 202.
In one embodiment, the first region of the front baffle 200 is spaced from the swirl plate 300 more than the second region of the front baffle 200 is spaced from the swirl plate 300, the middle region of the front baffle 200 is a sloped region where the first region transitions obliquely to the second region, and the nozzle base 101 is disposed on the sidewall of the mixer adjacent to the first region. At this time, the distance between the air inlet 202 of the first region and the swirl plate 300 is greater than the distance between the air inlet 202 of the second region and the swirl plate 300, and the air inlet 202 of the middle region is located on the inclined surface region where the first region is inclined and transited to the second region. It should be noted that, the distance between the first area and the swirl plate 300 is greater than the distance between the second area and the swirl plate 300, and the design is such that when the distance between the mixing assembly 400 and the swirl plate 300 is a certain distance, the exhaust gas enters the mixer outer tube 100 from the first area to strike the mixing assembly 400, the path of the exhaust gas entering the mixer outer tube 100 from the second area to strike the mixing assembly 400 is greater than the path of the exhaust gas entering the mixer outer tube 100 from the second area, and the nozzle base 101 is disposed on the side wall of the mixer close to the first area, so that the exhaust gas can be fully mixed with urea spray when entering the mixer outer tube 100 from the first area.
In another embodiment, the distance between the first area of the front baffle 200 and the swirl plate 300 may be equal to the distance between the second area of the front baffle 200 and the swirl plate 300, or the distance between the first area and the swirl plate 300 may be greater than the distance between the second area and the swirl plate 300, and the nozzle base 101 is disposed on the side wall of the mixer near the second area.
In the invention, the distance between the first area of the front baffle 200 and the swirl plate 300 is preferably greater than the distance between the second area of the front baffle 200 and the swirl plate 300, and the nozzle base 101 is arranged on the side wall of the mixer close to the first area, so that when the tail gas enters from the air inlets 202 of the first area, the second area and the middle area, the tail gas can be fully mixed with urea spray.
Further, as shown in fig. 3, in order to enable the exhaust gas to strike the mixing plate in the mixing assembly 400 after entering the mixer outer tube 100, baffles 201 are respectively disposed at positions of the air inlets 202 corresponding to the first and second regions, so that the air flow is guided by the baffles 201 toward the mixing assembly 400 to strike the mixing assembly 400.
Further, the baffle 201 is punched from the front baffle 200, and for convenience of understanding, one end of the baffle 201 connected to the sidewall of the air inlet 202 is referred to as a first end, and the other end of the baffle 201 is referred to as a second end. Wherein, the baffle 201 is bent along the first end of the baffle 201, so that the second end of the baffle 201 is tilted away from the front baffle 200.
In a specific embodiment, the baffle 201 of the first region of the front baffle 200 is inclined upward toward the mixing assembly 400 opposite the baffle 201 of the second region of the front baffle 200. The opposite direction of the inclination of the baffle 201 in the first region is opposite to the direction of the inclination of the baffle 201 in the second region. This design ensures that cross-impingement mixing assembly 400 can occur when the exhaust enters mixer outer tube 100, facilitating more thorough mixing of the exhaust with the urea spray.
In another embodiment, the baffle 201 in the first area of the front baffle 200 and the baffle 201 in the second area of the front baffle 200 tilt up toward the direction of the mixing assembly 400, and the tilt direction of the baffle 201 is the same, so that mixing of the exhaust gas and urea spray can be ensured.
The present invention preferably has the deflector 201 of the first region of the front baffle 200 tilted upward relative to the deflector 201 of the second region of the front baffle 200 in a direction toward the mixing assembly 400. This approach both ensures that more exhaust gas impinges on the mixing assembly 400 and that the exhaust gas is more thoroughly mixed with the urea spray.
Further, as shown in fig. 4, the swirl guide plate includes an outer swirl guide plate 301 and an inner swirl guide plate 303. Wherein, the outer swirl guide plate 301 is provided with an outer swirl hole 302 for forming a first swirl air flow, the inner swirl guide plate 303 is provided with an inner swirl hole 304 for forming a second swirl air flow, and the rotation directions of the first swirl air flow and the second swirl air flow are opposite. It should be noted that, when the first rotating airflow and the second rotating airflow rotate in opposite directions, the outer rotating airflow guide 301 forms the first rotating airflow rotating in the clockwise direction, the inner rotating airflow guide 303 forms the counterclockwise rotationA second rotating airflow; when the outer rotating guide 301 forms a first rotating air stream rotating in a counterclockwise direction, the inner rotating guide 303 forms a second rotating air stream rotating in a clockwise direction. The opposite gas flow favors NH 3 Before the mixed gas of the tail gas and the urea enters downstream equipment, the urea which is not decomposed is further decomposed into NH 3 So that the tail gas is connected with NH 3 The mixing is more uniform.
Further, the swirl guide is punched from the swirl plate 300, and for convenience of understanding, the end of the swirl guide connected to the swirl plate is referred to as a first end, and the end of the swirl guide tilted is referred to as a second end. Wherein, the first end of whirl board is connected with the lateral wall of whirl hole, and the whirl baffle is buckled along the first end of whirl baffle to make the second end slope perk of whirl baffle to the direction of keeping away from whirl board 300, the second end perk direction of whirl baffle can be directional mixing assembly 400, of course, the second end perk direction of whirl baffle also can deviate from mixing assembly 400, or outer whirl baffle 301 and inner whirl baffle 303 perk opposite direction. Whichever tilt direction is used, it is only necessary to ensure that the rotational air flow created by the outer swirl guide plate 301 is in the opposite direction to the rotational air flow created by the inner swirl guide plate 303. The specific tilting direction of the second end of the swirl guide plate is determined by a person skilled in the art according to the direction of the swirling air flow formed by the swirl guide plate.
Further, as shown in fig. 5, the mixing plates include a middle mixing plate 403 and first and second mixing plates 401 and 402 located on both sides of the middle mixing plate 403, respectively. In one embodiment, the distance between the first mixing plate 401 and the swirl plate 300 is greater than the distance between the second mixing plate 402 and the swirl plate 300, wherein the first mixing plate 401 is located on the side where the first region of the front baffle 200 is located, the second mixing plate 402 is located on the side where the second region of the front baffle 200 is located, and the middle mixing plate 403 is disposed between the first mixing plate 401 and the second mixing plate 402 and parallel to the first mixing plate 401 and the second mixing plate 402. A plurality of uniformly distributed diversion holes 404 are formed on the whole plate surface of the middle mixing plate 403 for guiding the airflow to pass through.
It should be noted that, the first mixing plate 401 being located on the side of the first area of the front baffle 200 means that the first mixing plate 401 is located below the air inlet 202 of the first area, so as to ensure that the exhaust gas enters from the air inlet 202 of the first area and can first strike the first mixing plate 401; the location of the second mixing plate 402 on the side of the second region of the front baffle 200 means that the second mixing plate 402 is located below the air inlet 202 of the second region. The middle mixing plate 403 being parallel to the first mixing plate 401 and the second mixing plate 402 means that the middle mixing plate 403 is arranged perpendicular to the front baffle 200 and the swirl plate 300. Of course, the middle mixing plate 403 may also be arranged at an inclined angle between the first mixing plate 401 and the second mixing plate 402. It is only necessary to ensure that the middle mixing plate 403 is located below the middle zone air inlet 202.
In another embodiment, the distance between the first mixing plate 401 and the swirl plate 300 may be equal to the distance between the second mixing plate 402 and the swirl plate 300, and when the distance between the first mixing plate 401 and the swirl plate 300 is equal to the distance between the second mixing plate 402 and the swirl plate 300, the exhaust gas enters the outer mixer tube 100 through the air inlet 202 of the first area, and is guided by the air guide plate 201, and can only strike the first mixing plate 401 and the middle mixing plate 403, but cannot strike the second mixing plate 402. If the second mixing plate 402 is enlarged in size, a larger cost is increased.
The distance between the first mixing plate 401 and the cyclone plate 300 is preferably larger than the distance between the second mixing plate 402 and the cyclone plate 300, so that the cost is saved, the exhaust gas can strike the first mixing plate 401 and the middle mixing plate 403 and the second mixing plate 402 after entering from the air inlet 202 of the first area, and the mixing time of the exhaust gas and urea spraying is further prolonged.
Further, as shown in fig. 6 and 8, the first mixing plate 401 and the second mixing plate 402 each include a mixed flow region in the middle and a swirl region at both ends of the mixed flow region, and the mixed flow region has a curved surface structure. In a specific embodiment, the mixing areas of the first mixing plate 401 and the second mixing plate 402 protrude away from the middle mixing plate 403, and a plurality of flow guiding holes 404 for guiding the airflow therethrough are further provided in the mixing areas. It should be noted that, the mixed flow areas of the first mixing plate 401 and the second mixing plate 402 protrude in a direction away from the middle mixing plate 403, so that the path of the air flow passing through the first mixing plate 401 and the second mixing plate 402 is longer, the mixing time of the tail gas and the urea spray is further increased, and the urea spray is decomposed more fully.
In another embodiment, the mixing flow areas of the first mixing plate 401 and the second mixing plate 402 protrude in a direction towards the middle mixing plate 403 or the first mixing plate 401 protrudes in a direction towards the middle mixing plate 403 and the mixing flow area of the second mixing plate 402 protrudes in a direction away from the middle mixing plate 403. Whichever design, the path of the air flow through the first mixing plate 401 and the second mixing plate 402 is shorter than in the previous embodiment, and the mixing time of the exhaust gas and the urea spray cannot be ensured, so that part of the urea spray cannot be mixed and decomposed with the exhaust gas, resulting in urea crystallization.
The mixing flow areas of the first mixing plate 401 and the second mixing plate 402 are preferably protruded away from the middle mixing plate 403, so that the longer path of the air flow passing through the first mixing plate 401 and the second mixing plate 402 is ensured, the tail gas and urea spray can be fully mixed, and the risk of urea crystallization is reduced.
Further, in order to form a rotating airflow when the airflow passes through the mixing plates, the mixing time of the exhaust gas and urea spray is increased, the swirling area of the first mixing plate 401 and the swirling area of the second mixing plate 402 are provided with a plurality of flow guiding ports 406, and the first mixing plate 401 and the second mixing plate 402 corresponding to the positions of each flow guiding port 406 are provided with flow guiding fins 405, so that the airflow forms the rotating airflow when passing through the flow guiding ports 406.
In a specific embodiment, for ease of understanding, one end of the first mixing plate 401 is referred to as a first end, and the other end of the first mixing plate 401 is referred to as a second end. Wherein, the flow guide fin 405 of first end is tilted to the direction that is close to the middle part mixing plate 403, and the flow guide fin 405 of second end is tilted to the direction that deviates from the middle part mixing plate 403 to can form rotatory air current when making the air current pass through the water conservancy diversion mouth 406, make tail gas and urea spraying mix more abundant. The tilting direction of the flow guiding fin 405 of the second mixing plate 402 is identical to the tilting direction of the flow guiding fin 405 of the first mixing plate 401, and will not be described herein.
Further, as shown in fig. 1, in order to make the mixing and decomposing time of urea and exhaust gas longer and the mixing of urea and exhaust gas more sufficient, the nozzle base 101 is provided on the side wall of the mixer corresponding to the mixing flow area of the first mixing plate 401. The fact that the nozzle base 101 is disposed in a region corresponding to the mixed flow region of the first mixing plate 401 means that the urea nozzle can spray urea perpendicularly to the mixed flow region of the first mixing plate 401. This design has guaranteed that urea spraying can mix with the tail gas that gets into from the first region of baffle 200, also can mix with the tail gas that gets into from second region and middle part region, and the tail gas after mixing and urea spraying strike first mixing plate 401, second mixing plate 402 and middle part mixing plate 403 simultaneously, make tail gas and urea spraying mix more evenly abundant.
Further, a plurality of sensor mounting seats 102 for mounting temperature sensors are further provided on the side wall of the outer mixer tube 100 near the first end position of the outer mixer tube 100, and sensor mounting holes 203 corresponding to the sensor mounting seats 102 are provided in the front barrier 200. Wherein, one side close to the sensor mount 102 is also provided with a connecting flange 103, and the connecting flange 103 protrudes outside the outer wall of the outer tube 100 of the mixer for connecting with upstream equipment.
The embodiment of the invention also discloses a diesel engine, which comprises a mixer, wherein the mixer is the cyclone mixer disclosed in the embodiment, so that the diesel engine has all the technical effects of the cyclone mixer, and the description is omitted herein.
The terms first and second and the like in the description and in the claims and in the above-described figures are used for distinguishing between different objects and not necessarily for describing a sequential or chronological order. Furthermore, the terms "comprise" and "have," as well as any variations thereof, are intended to cover a non-exclusive inclusion. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to the listed steps or elements but may include steps or elements not expressly listed.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (13)
1. A mixer, comprising:
a mixer outer tube (100) having a mixer sidewall such that the mixer outer tube (100) forms a flow channel for the flow of gas therethrough; a nozzle base (101) for installing a urea nozzle is arranged on the side wall of the mixer;
a front baffle plate (200) arranged at the first end of the outer mixer pipe (100), wherein an air inlet (202) for air supply flow to enter the outer mixer pipe (100) is formed in the front baffle plate (200);
the swirl plate (300) is arranged at the second end of the outer mixer pipe (100), swirl holes are formed in the swirl plate (300), and a swirl guide plate for forming rotary airflow is arranged on one side of the swirl plate (300) corresponding to each swirl hole;
a mixing assembly (400) disposed within the mixer outer tube (100) and between the front baffle (200) and the swirl plate (300), the mixing assembly (400) having a mixing plate for impinging an air flow and having a deflector aperture (404) formed therein;
the front baffle (200) comprises a middle area, and a first area and a second area which are respectively positioned at two ends of the middle area;
the distance between the first area and the cyclone plate (300) is larger than the distance between the second area and the cyclone plate (300), and the middle area is an inclined surface area in which the first area is in inclined transition to the second area;
the nozzle base (101) is arranged on the side wall of the mixer close to the first area;
the first region, the second region and the middle region are each provided with the air inlet (202).
2. A mixer according to claim 1, wherein baffles (201) are provided at the respective positions of the air inlets (202) corresponding to the first and second regions, such that the air flow impinges the mixing assembly (400) along the baffles (201).
3. The mixer according to claim 2, wherein the baffle (201) is stamped from the front baffle (200), one end of the baffle (201) is connected to a side wall of the air inlet (202), and the baffle (201) is bent along one end of the baffle (201) so that the other end of the baffle (201) is tilted away from the front baffle (200).
4. The mixer of claim 1, wherein the swirl guide plate comprises an outer swirl guide plate (301) and an inner swirl guide plate (303); an outer swirl hole (302) for forming a first swirl air flow is formed in the corresponding position of the outer swirl guide plate (301); an inner flow hole (304) for forming a second rotary air flow is formed in the corresponding position of the inner flow guide plate (303); the first rotating airflow is rotated in the opposite direction to the second rotating airflow.
5. The mixer according to claim 4, wherein the swirl guide is punched from the swirl plate (300), one end of the swirl guide is connected to a side wall of the swirl hole, and the swirl guide is bent along one end of the swirl guide such that the other end of the swirl guide is tilted away from the swirl plate (300).
6. The mixer according to claim 1, characterized in that the mixing plates comprise a central mixing plate (403) and a first mixing plate (401) and a second mixing plate (402) located on both sides of the central mixing plate (403), respectively; the distance between the first mixing plate (401) and the cyclone plate (300) is larger than the distance between the second mixing plate (402) and the cyclone plate (300), the first mixing plate (401) is positioned on one side of the front baffle (200) where the first area is located, and the second mixing plate (402) is positioned on one side of the front baffle (200) where the second area is located; the middle mixing plate (403) is arranged at a position between the first mixing plate (401) and the second mixing plate (402), and the middle mixing plate (403) is provided with a plurality of diversion holes (404).
7. The mixer according to claim 6, wherein the first mixing plate (401) and the second mixing plate (402) each comprise a mixed flow area in the middle and a swirl area at two ends of the mixed flow area, the mixed flow area has a curved surface structure, and the mixed flow area is provided with a plurality of diversion holes (404).
8. The mixer according to claim 7, characterized in that the mixing flow areas of the first mixing plate (401) and the second mixing plate (402) protrude in a direction away from the middle mixing plate (403).
9. A mixer according to claim 7, characterized in that the swirl area of the first mixing plate (401) and the swirl area of the second mixing plate (402) are provided with a number of flow guiding openings (406), and that flow guiding fins (405) are provided on the first mixing plate (401) and the second mixing plate (402) in correspondence of each flow guiding opening (406) in order to create a swirling air flow when the air flow passes the flow guiding opening (406).
10. The mixer according to claim 7, wherein the nozzle mount (101) is located on the mixer side wall corresponding to the mixing flow area of the first mixing plate (401).
11. The mixer according to claim 1, characterized in that a plurality of sensor mounts (102) for mounting temperature sensors are also provided on the side wall of the mixer outer tube (100) and near the first end position of the mixer outer tube (100).
12. The mixer of claim 11, wherein the front baffle (200) is provided with a sensor mounting hole (203) corresponding to the sensor mount (102).
13. A diesel engine comprising a mixer, wherein the mixer is as claimed in any one of claims 1 to 12.
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| CN202210741593.1A CN115030803B (en) | 2022-06-28 | 2022-06-28 | Mixer and diesel engine |
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| CN202210741593.1A CN115030803B (en) | 2022-06-28 | 2022-06-28 | Mixer and diesel engine |
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| CN115030803A CN115030803A (en) | 2022-09-09 |
| CN115030803B true CN115030803B (en) | 2023-12-15 |
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| CN217681929U (en) * | 2022-06-24 | 2022-10-28 | 潍柴动力股份有限公司 | Spiral-flow type blender and diesel engine |
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| 国六柴油机双旋流SCR混合器试验研究;张晓丽等;《车用发动机》(第2期);第49-55页 * |
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| CN115030803A (en) | 2022-09-09 |
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