CN115030803A - Mixer and diesel engine - Google Patents
Mixer and diesel engine Download PDFInfo
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- CN115030803A CN115030803A CN202210741593.1A CN202210741593A CN115030803A CN 115030803 A CN115030803 A CN 115030803A CN 202210741593 A CN202210741593 A CN 202210741593A CN 115030803 A CN115030803 A CN 115030803A
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- swirl
- flow
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- 238000002156 mixing Methods 0.000 claims abstract description 218
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 72
- 239000004202 carbamide Substances 0.000 claims abstract description 72
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 10
- 230000007704 transition Effects 0.000 claims description 4
- 238000002425 crystallisation Methods 0.000 abstract description 10
- 230000008025 crystallization Effects 0.000 abstract description 10
- 230000002035 prolonged effect Effects 0.000 abstract description 5
- 230000003116 impacting effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 107
- 239000007921 spray Substances 0.000 description 19
- 239000000203 mixture Substances 0.000 description 10
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 9
- 238000005507 spraying Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 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
- 230000000694 effects Effects 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
- 210000002268 wool Anatomy 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000000354 decomposition reaction Methods 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
- 238000004080 punching Methods 0.000 description 1
- 239000002912 waste gas Substances 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
- F01N3/18—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]
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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
-
- 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 comprise: a mixer outer tube having a mixer sidewall such that the mixer outer tube forms a flow passage; 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 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 pipe of the mixer, swirl holes are formed in the swirl plate, and a swirl guide plate for forming a swirling air flow is arranged on one side of the swirl plate corresponding to each swirl hole; the mixing assembly is arranged in the outer pipe of the mixer and positioned between the front baffle and the cyclone plate, the mixing assembly is provided with a mixing plate used for impacting with the airflow, and a flow guide hole is formed in the mixing plate. According to the mixer provided by the invention, tail gas enters the mixer through the gas inlet formed in the front baffle and simultaneously impacts 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 vehicles is developed to the stage VI of China, the emission standard has more strict definition on the tail gas pollutants. 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 decomposing urea is mixed with tail gas in an SCR mixer, the mixed tail gas enters an SCR reactor, the ammonia gas and nitrogen oxide in the tail gas react to generate nitrogen and water under the action of a catalyst, so that the nitrogen oxide in exhaust gas is reduced, the tail gas is treated to meet the emission standard of the state VI, and the mixing uniformity of the tail gas and the ammonia gas is of great importance in the tail gas treatment process of an engine.
In the prior art, the SCR mixer generally consists of a swirl tube, a swirl tube baffle, steel wool, and an outer tube. Urea spouts into the SCR blender through the urea nozzle that sets up on the outer pipe wall in, mixes with the tail gas that gets into the whirl pipe, and urea and tail gas mix back air current can be along the whirl direction whirl of whirl pipe, get into the SCR reactor through steel wool, because of urea is short with tail gas mixing time, lead to the urea crystallization problem serious.
Therefore, how to improve the mixing uniformity between the urea spray and the 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 is directed to a mixer to improve the mixing uniformity between urea spray and exhaust gas and reduce urea crystallization.
Another object of the present invention is to provide a diesel engine having the above mixer.
In order to achieve the purpose, the invention provides the following technical scheme:
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 to pass through; a nozzle base for mounting 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 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 pipe of the mixer, swirl holes are formed in the swirl plate, and a swirl guide plate for forming a rotating airflow is arranged on one side of the swirl plate corresponding to each swirl hole;
the mixing assembly is arranged in the outer pipe of the mixer and is positioned between the front baffle and the rotational flow plate, the mixing assembly is provided with a mixing plate which is used for being collided with the air flow, and the mixing plate is provided with a flow guide hole.
Optionally, in the above mixer, the front baffle includes a middle region and a first region and a second region respectively located at both ends of the middle region;
the distance between the first area and the swirl plate is greater than that between the second area and the swirl plate, and the middle area is a slope 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, baffles are respectively disposed at positions of the air inlets corresponding to the first area and the second area, so that the air flow hits the mixing assembly along the baffles.
Optionally, in the above mixer, the guide plate is formed by stamping the front baffle, one end of the guide plate is connected to the side wall of the air inlet, and the guide plate is bent along one end of the guide plate, so that the other end of the guide plate tilts and tilts in a direction away from the front baffle.
Optionally, in the above mixer, the swirl guide plate comprises an outer swirl guide plate and an inner swirl guide plate; an outer rotational flow hole for forming first rotational airflow is formed in the corresponding position of the outer rotational flow guide plate; an inner rotational flow hole for forming a second rotational air flow is formed in the corresponding position of the inner rotational flow guide plate; the first rotating airflow and the second rotating airflow rotate in opposite directions.
Optionally, in the above mixer, the swirl guide plate is formed by stamping the swirl plate, one end of the swirl guide plate is connected to the 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 tilts and tilts towards a direction away from the swirl plate.
Optionally, in the above mixer, the mixing plate comprises a middle mixing plate and a first mixing plate and a second mixing plate respectively located at both sides of the middle mixing plate; the distance between the first mixing plate and the swirl plate is greater than that between the second mixing plate and the swirl plate, the first mixing plate is positioned on one side of the front baffle where the first area is located, and the second mixing plate is positioned on one side of the front baffle where the second area is located; the middle part mixes the board setting and is in first mixed board with position between the second mixed board, just the middle part mixes the board and is provided with a plurality of water conservancy diversion holes.
Optionally, in the above mixer, the first mixing plate and the second mixing plate each include a flow mixing region located in a middle portion and a flow swirling region located at two ends of the flow mixing region, the flow mixing region is a curved surface structure, and the flow mixing region is provided with a plurality of flow guide holes.
Alternatively, in the above mixer, the mixed flow region of the first mixing plate and the second mixing plate is convex in a direction away from the middle mixing plate.
Optionally, in the above mixer, the swirling flow area of the first mixing plate and the swirling flow area of the second mixing plate are provided with a plurality of flow guide openings, and flow guide fins are provided on the first mixing plate and the second mixing plate corresponding to each position of the flow guide opening, so that the air flow forms a swirling air flow when passing through the flow guide openings.
Optionally, in the above mixer, the nozzle base is located on the mixer sidewall corresponding to a flow mixing region of the first mixing plate.
Optionally, in the above mixer, a plurality of sensor mounting seats for mounting a temperature sensor are further provided on the side wall of the outer mixer tube and near the first end of the outer mixer tube.
Optionally, in the above mixer, the front baffle has 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.
According to the mixer provided by the invention, tail gas enters the mixer through the gas inlet arranged on the front baffle plate and impacts the mixing plate, and meanwhile, urea is sprayed into the mixer through the urea nozzle on the side wall of the mixer, and urea spray decomposes NH under the high-temperature condition of the tail gas 3 ，NH 3 Fully mixed with the tail gas and then discharged from the swirl holes arranged on the swirl plate to form rotary airflow. Because tail gas enters the mixer from the gas inlet and strikes a mixing plate in the mixing component, the mixing and decomposing time of the tail gas and urea is increased, and NH is enabled 3 And the mixture is more uniformly mixed with the tail gas. When NH is present 3 When the tail gas is discharged by the cyclone plate, a rotary airflow is formed, and NH is further increased 3 The mixing uniformity with the tail gas.
Compared with the SCR mixer in the prior art, the tail gas enters the mixer from the gas inlet of the front baffle, strikes the mixing plate in the mixing component and is mixed with urea, so that the mixing and decomposing time of the tail gas and the urea is prolonged, and NH generated after the urea is decomposed 3 The tail gas and the tail gas are discharged out of the mixer through the cyclone plate in the form of rotating airflow, so that NH is generated during the discharging process 3 Continuously mixing with tail gas to further increase NH 3 Mixing time with tail gas. According to the mixer provided by the invention, tail gas enters the mixer through the air inlet formed in the front baffle plate and simultaneously impacts 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 rotational flow plate, and NH is further increased 3 Mixing time with exhaust gas due to NH 3 Long mixing time with tail gas, good mixing uniformity, and high efficiencyUrea crystallization is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a perspective view of a mixer provided by an embodiment of the present invention;
FIG. 2 is a front view of a mixer provided by an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a front baffle of a mixer provided by an embodiment of the invention;
FIG. 4 is a schematic structural diagram 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 accordance with an embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating a first mixing plate structure of a mixing assembly in the mixer provided in the embodiment of FIG. 5;
FIG. 7 is a schematic diagram 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 diagram illustrating a second mixing plate structure of a mixing assembly in the mixer provided in the embodiment of fig. 5.
Wherein, 100 is the blender outer tube, 101 is the nozzle base, 102 is the sensor mount pad, 103 is flange, 200 is preceding baffle, 201 is the guide plate, 202 is the air inlet, 203 is the sensor mounting hole, 300 is the whirl board, 301 is outer whirl baffle, 302 is outer whirl hole, 303 is interior whirl baffle, 304 is interior whirl hole, 400 is mixed the subassembly, 401 is first mixed board, 402 is the second mixed board, 403 is middle part mixed board, 404 is the water conservancy diversion hole, 405 is the water conservancy diversion fin, 406 is the water conservancy diversion mouth.
Detailed Description
The core of the invention is to provide a mixer to improve the mixing uniformity between the urea spray and the waste gas and reduce the urea crystallization.
The other core of the invention is to provide a diesel engine with the mixer.
Hereinafter, embodiments will be described with reference to the drawings. The embodiments described below are not intended to limit the scope of the present invention as set forth in the claims. The entire contents of the configurations shown in the following embodiments are not limited to those required as solutions of the inventions described in the claims.
As shown in fig. 1, the embodiment of the present invention discloses a mixer, which comprises an outer mixer tube 100, a front baffle 200, a swirl plate 300 and a mixing assembly 400.
The mixer outer tube 100 has a mixer sidewall, so that the mixer outer tube 100 forms a flow passage for the gas flow to pass through, and the wall thickness of the mixer sidewall needs to be determined by those skilled in the art according to actual conditions. As can be appreciated by those skilled in the art, the thicker the mixer sidewall, the better the thermal insulation performance, and the higher the dead weight, the higher the corresponding cost; the thinner the side wall of the mixer is, the poorer the heat preservation performance is, the smaller the self weight is, the corresponding cost can be 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 inject urea into the mixer to mix with the exhaust gas, a nozzle base 101 for installing a urea nozzle is provided on a side wall of the mixer. In one embodiment, the nozzle base 101 is positioned proximate to the inlet of the mixer outer tube 100. It should be noted that the close proximity to the gas inlet is beneficial to the full mixing of the tail gas and the urea, and the mixing and decomposing time of the tail gas and the urea is ensured. Of course, the nozzle base 101 may be disposed at a position far away from the air inlet of the mixer outer tube 100, so that the mixing and decomposing time of the exhaust gas and the urea is shortened, and the exhaust 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 mixer outer tube 100, where the first end refers to an air inlet end of the mixer outer tube 100, and the front baffle 200 is spaced from the air inlet end of the mixer outer 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, the front baffle 200 is provided with an air inlet 202 for allowing air flow to enter the outer pipe 100 of the mixer, and when the tail gas flows from upstream equipment to the front baffle 200, the tail gas enters the outer pipe 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 mixer outer tube 100, it should be noted that the second end refers to an air outlet end of the mixer outer tube 100, and a certain distance is left between the swirl plate 300 and the air outlet end of the mixer outer tube 100 for connecting with a downstream device. In order to ensure tail gas and NH 3 Mix more abundant even when discharging, set up the whirl hole on the whirl board 300, be provided with the whirl baffle that is used for forming rotatory air current in the one side of the whirl board 300 that corresponds every whirl hole position. One side refers to a direction away from the swirl plate 300, which may be directed toward the inner cavity of the mixer outer tube 100 or directed away from the inner cavity of the mixer outer tube 100. When tail gas and NH 3 When the mixed gas passes through the swirl plate 300, the mixed gas is guided by the swirl guide plate and discharged from the mixer through the swirl holes, thereby forming a swirling flow.
Further, in order to guarantee urea and tail gas mixed decomposition time, make urea and tail gas mix more fully even, avoid the urea crystallization, as shown in fig. 5, be provided with mixing assembly 400 in blender outer tube 100, mixing assembly 400 is located between baffle 200 and the whirl board 300 before, mixing assembly 400 has the mixing plate that is used for with the air current striking, and has seted up water conservancy diversion hole 404 on the mixing plate. The nozzle base 101 is located between the front baffle 200 and the swirl plate 300 for spraying urea spray through the urea nozzle onto the mixing assembly 400.
In one embodiment, when exhaust enters from the inlet 202 of the front baffle 200, it hits the mixing plate in the mixing assembly 400 and flows out of the flow guide holes 404 formed in the mixing plate and mixes with the urea spray from the urea nozzle, which decomposes under the high temperature conditions of the exhaust to produce NH 3 ，NH 3 Fully mixed with the tail gas, discharged by the cyclone plate 300 to form a rotating airflow, and enter downstream equipment.
According to the mixer provided by the invention, tail gas enters the mixer through the gas inlet 202 formed in the front baffle 200 and impacts the mixing plate, meanwhile, urea is sprayed into the mixer through the urea nozzle on the side wall of the mixer, and the urea spray decomposes NH under the high-temperature condition of the tail gas 3 ，NH 3 Fully mixed with the tail gas and then discharged through the swirl holes arranged on the swirl plate 300 to form a rotating airflow. As the tail gas enters the mixer from the gas inlet and impacts the mixing plate in the mixing component 400, the mixing and decomposing time of the tail gas and the urea is increased, so that NH is generated 3 And the mixture is more uniformly mixed with the tail gas. When NH is present 3 When the tail gas is discharged from the cyclone plate 300, a rotary airflow is formed, and NH is further increased 3 The mixing uniformity with the tail gas.
Compared with the SCR mixer in the prior art, the tail gas enters the mixer from the gas inlet 202 of the front baffle 200, strikes the mixing plate in the mixing assembly 400 and is mixed with the urea, so that the mixing and decomposing time of the tail gas and the urea is prolonged, and NH (NH) generated after the urea is decomposed is increased 3 The tail gas and the tail gas are discharged out of the mixer through the cyclone plate 300 in the form of a rotating airflow, so that NH is generated during the discharging process 3 Continuously mixing with tail gas to further increase NH 3 Mixing time with tail gas. According to the mixer provided by the invention, tail gas enters the mixer through the gas inlet 202 formed in the front baffle 200 and simultaneously impacts 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 300, and NH is further increased 3 Mixing time with exhaust gas due to NH 3 The mixing time with tail gas is long, the mixing uniformity is excellent, and urea crystallization is effectively avoided.
Further, as shown in fig. 3, the front baffle 200 is divided into a middle region and a first region and a second region respectively located at both ends of the middle region, and the first region, the second region, and the middle region are provided with air inlets 202.
In a specific embodiment, the distance between the first region of the front baffle 200 and the swirl plate 300 is greater than the distance between the second region of the front baffle 200 and the swirl plate 300, the middle region of the front baffle 200 is a slope region in which the first region is in inclined transition to the second region, and the nozzle base 101 is disposed on the side wall of the mixer near the first region. At this moment, the distance between the air inlet 202 and the swirl plate 300 in the first region is greater than the distance between the air inlet 202 and the swirl plate 300 in the second region, and the air inlet 202 in the middle region is located on the inclined surface region of the inclined transition from the first region to the second region. It should be noted that, the distance between the first region and the swirl plate 300 is greater than the distance between the second region and the swirl plate 300, and this design makes the path of the tail gas entering the mixer outer tube 100 from the first region and striking the mixing assembly 400 greater than the path of the tail gas entering the mixer outer tube 100 from the second region and striking the mixing assembly 400 when the mixing assembly 400 is a fixed distance from the swirl plate 300 to the mixer outer tube 100, and because the nozzle base 101 is disposed on the mixer sidewall close to the first region, the tail gas can be sufficiently mixed with the urea spray when entering the mixer outer tube 100 from the first region.
In another embodiment, the distance between the first region of the front baffle 200 and the swirl plate 300 may be equal to the distance between the second region of the front baffle 200 and the swirl plate 300, or the distance between the first region and the swirl plate 300 is greater than the distance between the second region and the swirl plate 300, and the nozzle base 101 is disposed on the side wall of the mixer near the second region, which design scheme is not as good as the scheme disclosed in the above embodiments, but under the effect of the mixing assembly 400, the exhaust gas and the urea spray can be fully mixed.
According to 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 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 impact the mixing plate in the mixing assembly 400 after entering the mixer outer tube 100, a diversion plate 201 is respectively disposed at the positions of the air inlets 202 corresponding to the first area and the second area, so that the air flow is guided by the diversion plate 201 towards the mixing assembly 400 to impact the mixing assembly 400.
Further, the baffle 201 is punched out of the front baffle 200, and for convenience of understanding, one end of the baffle 201 connected to the side wall 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. The air guide plate 201 is bent along the first end of the air guide plate 201, so that the second end of the air guide plate 201 tilts and tilts towards a direction far away from the front baffle 200.
In one embodiment, the baffle 201 of the first region of the front baffle 200 is tilted with respect to the baffle 201 of the second region of the front baffle 200 in a direction toward the mixing assembly 400. By relative is meant that the direction of inclination of the baffle 201 in the first zone is opposite to the direction of inclination of the baffle 201 in the second zone. This design has guaranteed that when tail gas got into blender outer tube 100, cross striking mixing assembly 400 can appear, is favorable to tail gas and urea spraying to mix more fully.
In another embodiment, the deflector 201 of the first area of the front baffle 200 and the deflector 201 of the second area of the front baffle 200 are tilted in the direction toward the mixing assembly 400, and the same tilting direction of the deflector 201 can also ensure the mixing of the exhaust gas and the urea spray.
It is preferable in the present invention that the baffle 201 of the first region of the front baffle 200 is tilted with respect to the baffle 201 of the second region of the front baffle 200 in a direction toward the mixing assembly 400. This approach ensures that more exhaust impinges on the mixing assembly 400 and that the exhaust and urea spray mix more thoroughly.
Further, as shown in fig. 4, the swirling flow guide plate includes an outer swirling flow guide plate 301 and an inner swirling flow guide plate 303. An outer swirl hole 302 for forming a first rotating airflow is formed in a position corresponding to the outer swirl guide plate 301, an inner swirl hole 304 for forming a second rotating airflow is formed in a position corresponding to the inner swirl guide plate 303, and the rotating directions of the first rotating airflow and the second rotating airflow are opposite. It should be noted that, the first rotating airflow and the second rotating airflow rotate in opposite directions, which means that when the outer swirling guide plate 301 forms the first rotating airflow rotating clockwise, the inner swirling guide plate 303 forms the second rotating airflow rotating counterclockwise; when the external vortex is conductedWhen the plate 301 forms a first rotating airflow rotating in a counterclockwise direction, the inner swirling guide plate 303 forms a second rotating airflow rotating in a clockwise direction. The opposite flow favors NH 3 Before the mixed gas with the tail gas enters downstream equipment, the urea which is not decomposed is further decomposed into NH 3 So that the tail gas is mixed with NH 3 The mixing is more uniform.
Further, the whirl guide plate is obtained by punching the whirl plate 300, and for convenience of understanding, the end of the whirl guide plate connected with the whirl plate is called as a first end, and the end of the whirl guide plate tilted is called as a second end. Wherein, the first end of whirl board is connected with the lateral wall in whirl hole, and the first end bending of whirl baffle along the whirl baffle to make the second end of whirl baffle to the direction slope perk of keeping away from whirl board 300, the second end perk direction of whirl baffle can point to mixing assembly 400, of course, the second end perk direction of whirl baffle also can deviate from mixing assembly 400, perhaps outer whirl baffle 301 and interior whirl baffle 303 perk opposite direction. No matter which tilting direction is adopted, the rotating airflow formed by the outer cyclone guide plate 301 is opposite to the rotating airflow formed by the inner cyclone guide plate 303. The specific tilting direction of the second end of the swirl guide plate needs to be determined by a person skilled in the art according to the direction of the rotating airflow formed by the swirl guide plate.
Further, as shown in fig. 5, the mixing plate includes a middle mixing plate 403 and first and second mixing plates 401 and 402 respectively positioned at both sides of the middle mixing plate 403. In an 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 at the side of the first region of the front baffle 200, the second mixing plate 402 is located at the side of the second region of the front baffle 200, and the middle mixing plate 403 is disposed between the first mixing plate 401 and the second mixing plate 402 and is parallel to the first mixing plate 401 and the second mixing plate 402. A plurality of uniformly distributed flow guide holes 404 are formed in the whole surface of the middle mixing plate 403 for guiding the air flow to pass through.
It should be noted that the side of the first mixing plate 401 located at the first area of the front baffle 200 refers to that the first mixing plate 401 is located below the air inlet 202 of the first area, so that the exhaust entering from the air inlet 202 of the first area can first impact the first mixing plate 401; the second mixing plate 402 is located at 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 mixer plate 403 is parallel to the first mixer plate 401 and the second mixer plate 402, which means that the middle mixer plate 403 is arranged perpendicular to the front baffle 200 and the whirl plate 300. Of course, the middle mixing plate 403 may also be disposed between the first mixing plate 401 and the second mixing plate 402 at an inclined angle. It is only necessary to ensure that the middle mixing plate 403 is located below the middle region air inlet 202.
In another embodiment, the distance between the first mixing plate 401 and the swirl plate 300 is also equal to the distance between the second mixing plate 402 and the swirl plate 300, 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 can only impact the first mixing plate 401 and the middle mixing plate 403, but cannot impact the second mixing plate 402, when entering the mixer outer tube 100 from the air inlet 202 of the first region, guided by the guide plate 201. If the second mixing plate 402 is enlarged in size, a large cost is added.
According to the invention, the distance between the first mixing plate 401 and the swirl plate 300 is preferably larger than the distance between the second mixing plate 402 and the swirl plate 300, so that the cost is saved, and the tail gas can not only impact the first mixing plate 401 and the middle mixing plate 403 after entering from the air inlet 202 of the first area, but also impact the second mixing plate 402, thereby increasing the mixing time of the tail gas and the urea spray.
Further, as shown in fig. 6 and 8, each of the first mixing plate 401 and the second mixing plate 402 includes a mixed flow region at a middle portion and a swirling flow region at both ends of the mixed flow region, and the mixed flow region has a curved surface structure. In a specific embodiment, the mixed flow area of the first mixing plate 401 and the second mixing plate 402 is protruded away from the middle mixing plate 403, and a plurality of guide holes 404 for guiding the airflow are further provided in the mixed flow area. It should be noted that the mixed flow area of the first mixing plate 401 and the second mixing plate 402 protrudes 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 exhaust gas and the urea spray is further increased, and the urea spray is decomposed more sufficiently.
In another embodiment, the mixed flow region of the first mixing plate 401 and the second mixing plate 402 is convex toward the middle mixing plate 403, or the mixed flow region of the first mixing plate 401 is convex toward the middle mixing plate 403, and the mixed flow region of the second mixing plate 402 is convex away from the middle mixing plate 403. In any case, compared with the previous embodiment, the path of the gas flow passing through the first mixing plate 401 and the second mixing plate 402 is short, 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, and urea crystallization is caused.
According to the invention, the mixed flow area of the first mixing plate 401 and the second mixing plate 402 preferably protrudes towards the direction far away from the middle mixing plate 403, so that the path of the airflow passing through the first mixing plate 401 and the second mixing plate 402 is longer, the tail gas and the urea spray can be fully mixed, and the risk of urea crystallization is reduced.
Further, in order to form a swirling airflow when the airflow passes through the mixing plates, and increase the mixing time of the exhaust gas and the urea spray, a plurality of flow guide ports 406 are provided in the swirling flow region of the first mixing plate 401 and the swirling flow region of the second mixing plate 402, and flow guide fins 405 are provided on the first mixing plate 401 and the second mixing plate 402 corresponding to the position of each flow guide port 406, so that the swirling airflow is formed when the airflow passes through the flow guide 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 water conservancy diversion fin 405 of first end is to the direction perk that is close to middle part mixing plate 403, and the water conservancy diversion fin 405 of second end is to the direction perk of the middle part mixing plate 403 of keeping away from to can form rotatory air current when making the air current pass through water conservancy diversion mouth 406, make tail gas and urea spraying mix more fully. The tilting direction of the flow guiding fin 405 of the second mixing plate 402 is the same as the tilting direction of the flow guiding fin 405 of the first mixing plate 401, and will not be described herein again.
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 disposed on the mixer sidewall corresponding to the flow mixing region of the first mixing plate 401. It should be noted that the nozzle mount 101 is disposed in a region corresponding to the mixed flow region of the first mixing plate 401, which means that the urea nozzle can inject urea perpendicular 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 in the first region of preceding baffle 200, also can mix with the tail gas that gets into from the second region and middle part region, and the tail gas after mixing strikes first mixing plate 401, second mixing plate 402 and middle part mixing plate 403 with urea spraying simultaneously, makes tail gas and urea spraying mix more evenly abundant.
Further, a plurality of sensor mounting seats 102 for mounting temperature sensors are further disposed on the side wall of the mixer outer tube 100 and near the first end of the mixer outer tube 100, and sensor mounting holes 203 corresponding to the sensor mounting seats 102 are opened in the front baffle 200. Wherein, a connecting flange 103 is further disposed at a side close to the sensor mounting seat 102, and the connecting flange 103 protrudes outward from the outer wall of the mixer outer tube 100 for connecting with an upstream device.
The embodiment of the invention also discloses a diesel engine, which comprises a mixer, wherein the mixer is the rotational flow type mixer disclosed in the embodiment, so that the technical effects of the rotational flow type mixer are achieved, and the details are not repeated herein.
The terms "first" and "second," and the like in the description and claims of the present invention and in the above-described drawings, are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not set forth for a listed step or element but may include steps or elements not 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 (14)
1. A mixer, comprising:
a mixer outer tube (100) having a mixer sidewall such that the mixer outer tube (100) forms a flow passage for a gas flow to pass through; a nozzle base (101) for mounting a urea nozzle is arranged on the side wall of the mixer;
the front baffle (200) is arranged at the first end of the mixer outer pipe (100), and an air inlet (202) for air to enter the mixer outer pipe (100) is formed in the front baffle (200);
the swirl plate (300) is arranged at the second end of the mixer outer tube (100), swirl holes are formed in the swirl plate (300), and a swirl guide plate for forming a swirling air flow is arranged on one side of the swirl plate (300) corresponding to each swirl hole;
mix subassembly (400), set up in blender outer tube (100), and be located preceding baffle (200) with between whirl board (300), mix subassembly (400) have be used for with the mixer plate of air current striking, and the water conservancy diversion hole (404) has been seted up on the mixer plate.
2. The mixer according to claim 1, characterized in that said front baffle (200) comprises a central zone and a first zone and a second zone, respectively located at the two ends of said central zone;
the distance between the first area and the swirl plate (300) is greater than that between the second area and the swirl plate (300), and the middle area is a slope area in which the first area is in inclined transition to the second area;
the nozzle base (101) is disposed on a mixer sidewall proximate the first zone;
the first, second and middle regions are each provided with the air inlet (202).
3. The mixer according to claim 2, wherein a baffle (201) is provided at the position of the air inlet (202) corresponding to the first and second zones, respectively, so that the air flow hits the mixing assembly (400) along the baffle (201).
4. The mixer according to claim 3, wherein the baffle (201) is punched from the front baffle (200), one end of the baffle (201) is connected to the side wall of the air inlet (202), and the baffle (201) is bent along one end of the baffle (201) to tilt the other end of the baffle (201) away from the front baffle (200).
5. A mixer according to 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) used for forming a first rotating airflow is formed in the position corresponding to the outer swirl guide plate (301); an inner swirl hole (304) used for forming a second rotating airflow is formed in the position corresponding to the inner swirl guide plate (303); the first rotating airflow and the second rotating airflow rotate in opposite directions.
6. The mixer according to claim 5, wherein the swirl guide plate is punched from the swirl plate (300), one end of the swirl guide plate is connected to the side wall of the swirl hole, and the swirl guide plate is bent along one end of the swirl guide plate such that the other end of the swirl guide plate is tilted away from the swirl plate (300).
7. A mixer according to claim 2, wherein the mixing plates comprise a middle mixing plate (403) and a first mixing plate (401) and a second mixing plate (402) on either side of the middle mixing plate (403), respectively; 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), the first mixing plate (401) is positioned on one side of the front baffle plate (200) where the first area is located, and the second mixing plate (402) is positioned on one side of the front baffle plate (200) where the second area is located; the middle mixing plate (403) is disposed 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 guide holes (404).
8. The mixer according to claim 7, wherein the first mixing plate (401) and the second mixing plate (402) each include a flow mixing region at a middle portion and a flow swirling region at both ends of the flow mixing region, the flow mixing region being a curved surface structure, the flow mixing region being provided with a plurality of flow guide holes (404).
9. The mixer according to claim 8, characterized in that the mixed flow area of the first mixer plate (401) and the second mixer plate (402) is convex away from the middle mixer plate (403).
10. The mixer according to claim 8, wherein 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 openings (406), and flow guiding fins (405) are provided on the first mixing plate (401) and the second mixing plate (402) corresponding to the position of each flow guiding opening (406) to form a swirling air flow when the air flow passes through the flow guiding openings (406).
11. The mixer according to claim 8, characterized in that the nozzle base (101) is located on the mixer side wall corresponding to the mixing flow area of the first mixing plate (401).
12. The mixer of claim 1, wherein a plurality of sensor mounts (102) for mounting temperature sensors are further provided on the side wall of the outer mixer tube (100) proximate the first end of the outer mixer tube (100).
13. The mixer according to claim 12, wherein the front baffle (200) is provided with a sensor mounting hole (203) corresponding to the sensor mounting seat (102).
14. A diesel engine comprising a mixer, wherein the mixer is as claimed in any one of claims 1 to 13.
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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 true CN115030803A (en) | 2022-09-09 |
| CN115030803B 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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| CN115030803B (en) | 2023-12-15 |
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