CN112855314B - Electric heating urea mixer - Google Patents
Electric heating urea mixer Download PDFInfo
- Publication number
- CN112855314B CN112855314B CN202110161885.3A CN202110161885A CN112855314B CN 112855314 B CN112855314 B CN 112855314B CN 202110161885 A CN202110161885 A CN 202110161885A CN 112855314 B CN112855314 B CN 112855314B
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- Prior art keywords
- shell
- electric heating
- plate
- gasket
- heating component
- Prior art date
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 40
- 239000004202 carbamide Substances 0.000 title claims abstract description 40
- 238000005485 electric heating Methods 0.000 title claims abstract description 40
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 239000000919 ceramic Substances 0.000 claims description 5
- 238000002425 crystallisation Methods 0.000 abstract description 12
- 230000008025 crystallization Effects 0.000 abstract description 12
- 238000006243 chemical reaction Methods 0.000 abstract description 10
- 238000010438 heat treatment Methods 0.000 description 12
- 239000007789 gas Substances 0.000 description 7
- 239000007788 liquid Substances 0.000 description 7
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
- F01N3/2013—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating using electric or magnetic heating means
-
- 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
- F01N3/2882—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/16—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being an electric heater, i.e. a resistance heater
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/20—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a flow director or deflector
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/10—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance
- F01N2610/102—Adding substances to exhaust gases the substance being heated, e.g. by heating tank or supply line of the added substance after addition to exhaust gases, e.g. by a passively or actively heated surface in the exhaust conduit
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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
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1453—Sprayers or atomisers; Arrangement thereof in the exhaust apparatus
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
- F01N2610/1486—Means to prevent the substance from freezing
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
The invention discloses an electric heating urea mixer, wherein an electric heating component is arranged in a shell, an air inlet channel and an air inlet cavity which are communicated are formed between the electric heating component and the upper inner wall surface of the front part of the shell, and an air outlet channel and an air outlet cavity which are communicated are formed between the electric heating component and the lower inner wall surface of the rear part of the shell; the electric heating component is provided with a plurality of air flow channels which are communicated with the air inlet cavity and the air outlet cavity. According to the invention, the low-temperature airflow is heated by the electric heating component under the low-temperature working condition, so that the low-temperature airflow can be quickly heated to high temperature, the conversion efficiency of NO x under the low-temperature working condition is improved, and the urea crystallization risk is reduced.
Description
Technical Field
The invention relates to the technical field of engine tail gas aftertreatment, in particular to an electric heating urea mixer.
Background
In an engine exhaust aftertreatment system, a Selective Catalytic Reduction (SCR) technology is generally adopted to carry out aftertreatment on exhaust emission of an engine; in order to ensure that urea liquid drops can be fully and uniformly mixed with diesel engine tail gas in an aftertreatment system, a mixer is added in the aftertreatment system, urea aqueous solution is sprayed into the mixer, the urea aqueous solution is decomposed into ammonia (NH 3) through tail gas heating, and nitrogen oxides (NO X) in the tail gas are reduced into harmless nitrogen (N 2) and water (H 2 O) through the ammonia (NH 3) under the action of a catalyst, and finally the nitrogen oxides are discharged from a tail gas pipe, so that the aim of reducing emissions is fulfilled.
Along with the implementation of national six-emission regulation, the emission limit requirements of NO x under low-temperature cold start and low-temperature low-load working conditions are increased on the exhaust gas, and under the low-temperature working conditions, the activity of the catalyst of the SCR carrier is poor, so that the conversion efficiency of NO x is poor, meanwhile, urea liquid drops are not easy to evaporate under the low-temperature working conditions, urea crystals are generated in the mixer, and the mixer is blocked by serious problems, so that the mixer is invalid.
Disclosure of Invention
Aiming at the defects that the NO x conversion efficiency of the post-treatment urea mixer is poor and urea crystallization is easy to generate under the low-temperature working condition, the inventor provides an electric heating urea mixer with reasonable structure, improves the NO x conversion efficiency under the low-temperature working condition, and avoids generating urea crystallization.
The technical scheme adopted by the invention is as follows:
an electric heating type urea mixer is characterized in that an electric heating component is arranged in a shell, an air inlet channel and an air inlet cavity are communicated between the electric heating component and the upper inner wall surface of the front part of the shell, and an air outlet channel and an air outlet cavity are communicated between the electric heating component and the lower inner wall surface of the rear part of the shell; the electric heating component is provided with a plurality of air flow channels which are communicated with the air inlet cavity and the air outlet cavity.
According to the invention, the low-temperature airflow is heated by the electric heating component under the low-temperature working condition, so that the low-temperature airflow can be quickly heated to high temperature, the conversion efficiency of NO x under the low-temperature working condition is improved, and the urea crystallization risk is reduced.
As a further improvement of the above technical scheme:
the air flow channel is a square channel.
The square channel is formed by orthogonal arrangement of a plurality of axial plates and a plurality of radial plates.
The four sides of the square airflow channel are all resistance heating surfaces, the four surfaces heat the flowing airflow, the heating area is large, the heating speed is high, the low-temperature airflow can be quickly and efficiently heated to high temperature, and the conversion efficiency of NO x is improved; meanwhile, the four sides of the airflow channel are heated, urea liquid drops drop on each surface, are quickly and fully heated, volatilize and pyrolyze, urea crystallization caused by urea liquid drop deposition is avoided, the risk of urea crystallization is low, and the effectiveness of the mixer is ensured.
The electric heating assembly comprises a negative plate, a resistor plate group and a positive plate, wherein a negative electrode joint is arranged on the negative plate, and a positive electrode joint is arranged on the positive plate; the resistance plate group comprises a plurality of vertical arrangement, axial plates with intervals, a plurality of vertical arrangement and radial plates with intervals, and the axial plates and the radial plates are orthogonally arranged.
The negative plate and the positive plate are arranged oppositely and are provided with mutually overlapped areas in the radial height, and the resistor plate group is arranged in the overlapped areas between the negative plate and the positive plate; in the shell, an air inlet cavity is formed at the upper side of the top surface of the resistance plate group and the front side of the positive plate, and an air outlet cavity is formed at the lower side of the bottom surface of the resistance plate group and the rear side of the negative plate.
The negative plate covers the middle-lower radial section of the front part of the shell, the arc edge of the negative plate is fixed on the inner wall surface of the middle-lower side of the shell through a first liner, and an air inlet channel is formed between the chord edge of the negative plate and the corresponding inner wall surface of the shell.
The first gasket is a major arc ceramic gasket and is fixedly arranged on the inner wall surface of the middle lower side of the front part of the shell; the inner cambered surface of the first liner is provided with a first groove along the circumferential direction, and the middle part of the first liner is provided with a first through mounting hole along the radial direction; the arc edge of the negative plate is inserted into the first groove, and the negative electrode joint penetrates out of the first mounting hole and the corresponding mounting hole on the shell.
The positive plate covers the middle-upper radial section of the rear part of the shell, the arc edge of the positive plate is fixed on the middle-upper inner wall of the shell through a second liner, and an air outlet channel is formed between the chord edge shell of the positive plate and the corresponding inner wall surface.
The second gasket is a major arc ceramic gasket and is fixedly arranged on the inner wall surface of the middle upper side of the rear part of the shell; the inner cambered surface of the second liner is provided with a second groove along the circumferential direction, and the middle part of the second liner is provided with a through second mounting hole along the radial direction; the arc edge of the positive plate is inserted into the second groove, and the positive electrode joint penetrates out of the second mounting hole and the corresponding mounting hole on the shell.
A nozzle seat is arranged on the shell and opposite to the electric heating component; a deflector is arranged on the inner peripheral wall surface of the lower side of the shell and positioned at the rear of the electric heating component, and a plurality of through holes are formed in the deflector.
The beneficial effects of the invention are as follows:
According to the invention, the low-temperature airflow is heated by the electric heating component under the low-temperature working condition, so that the low-temperature airflow can be quickly heated to high temperature, the conversion efficiency of NO x under the low-temperature working condition is improved, and the urea crystallization risk is reduced.
The four sides of the square airflow channel are all resistance heating surfaces, the four surfaces heat the flowing airflow, the heating area is large, the heating speed is high, the low-temperature airflow can be quickly and efficiently heated to high temperature, and the conversion efficiency of NO x is improved; meanwhile, the four sides of the airflow channel are heated, urea liquid drops drop on each surface, are quickly and fully heated, volatilize and pyrolyze, urea crystallization caused by urea liquid drop deposition is avoided, the risk of urea crystallization is low, and the effectiveness of the mixer is ensured.
Drawings
Fig. 1 is an exploded view of the present invention.
Fig. 2 is an enlarged view of a portion a in fig. 1.
Fig. 3 is an enlarged view of a portion B in fig. 1.
Fig. 4 is a longitudinal cross-sectional view of the present invention.
Fig. 5 is a perspective view of an electrical heating assembly.
Fig. 6 is an enlarged view of a portion C in fig. 5.
In the figure: 1. a housing; 2. a nozzle holder; 3. an electrical heating assembly; 31. a negative plate; 32. a negative electrode joint; 33. a resistor plate group; 331. an axial plate; 332. a radial plate; 333. an air flow channel; 34. a positive plate; 35. a positive electrode joint; 4. a first gasket; 41. a first groove; 42. a first mounting hole; 5. a second gasket; 51. a second groove; 52. a second mounting hole; 6. a deflector; 61. a through hole; 10. an air inlet cavity; 11. an air intake passage; 20. an air outlet cavity; 21. and an air outlet channel.
Detailed Description
The following describes specific embodiments of the present invention with reference to the drawings.
As shown in fig. 1 and 4, the upper peripheral wall surface of the cylindrical housing 1 of the present invention is provided with a nozzle holder 2, and the nozzle holder 2 is connected to a urea nozzle (not shown). An electric heating component 3 is arranged in the shell 1 and is opposite to the nozzle seat 2, and the front side and the rear side of the electric heating component 3 are respectively fixed on the inner wall surface of the shell 1 through a first gasket 4 and a second gasket 5; the baffle 6 is arranged on the inner peripheral wall surface of the lower side of the shell 1 and positioned at the rear of the electric heating assembly 3, a plurality of through holes 61 are formed in the baffle 6, and the baffle 6 can block the flowing air flow, so that the air flow can flow upwards in an inclined way, the local air flow speed of the lower side is prevented from being too high, and the uniformity of the air flow speed is improved.
As shown in fig. 1,2 and 3, the first gasket 4 and the second gasket 5 are major arc ceramic gaskets, and are arranged between the outer shell 1 and the electric heating component 3 as insulators to electrically isolate the outer shell 1 from the electric heating component 3; the outline dimensions of the outer peripheral surfaces of the first gasket 4 and the second gasket 5 are matched with the outline dimension of the inner peripheral surface of the shell 1, the first gasket 4 is fixedly arranged on the middle-lower side inner wall surface of the front part of the shell 1, and the second gasket 5 is fixedly arranged on the middle-upper side inner wall surface of the rear part of the shell 1. The inner cambered surface of the first liner 4 is provided with a first groove 41 along the circumferential direction, and the middle part of the first liner 4 is provided with a first through mounting hole 42 along the radial direction; the inner cambered surface of the second gasket 5 is provided with a second groove 51 along the circumferential direction, and the middle part of the second gasket 5 is provided with a second through mounting hole 52 along the radial direction.
As shown in fig. 1 and 5, the electric heating assembly 3 is provided with a negative plate 31, a resistive plate group 33 and a positive plate 34 in this order from front to back; the negative plate 31 and the positive plate 34 are arranged in a relative manner, the top of the arc-shaped edge of the negative plate 31 extends out to form a negative electrode joint 32, and the top of the arc-shaped edge of the positive plate 34 extends out to form a positive electrode joint 35. As shown in fig. 4, the arc-shaped edge of the negative plate 31 is positioned at the lower side, the outline size of the arc-shaped edge is matched with the outline size of the first groove 41 of the first liner 4, the arc-shaped edge of the negative plate 31 is inserted into the first groove 41, and the negative electrode joint 32 penetrates out from the first mounting hole 42 of the first liner 4 and the corresponding mounting hole on the shell 1; the negative plate 31 covers the middle-lower radial section of the front part of the shell 1, and a gap is formed between the chord edge of the upper side of the negative plate 31 and the corresponding inner wall surface of the shell 1 to form an air inlet channel 11. The arc edge of the positive plate 34 is positioned on the upper side, the outline size of the arc edge is matched with the outline size of the second groove 51 of the second gasket 5, the arc edge of the positive plate 34 is inserted into the second groove 51, and the positive electrode joint 35 penetrates out from the second mounting hole 52 of the second gasket 5 and the corresponding mounting hole on the shell 1; the positive electrode plate 34 covers the upper-middle radial section of the rear part of the shell 1, and a gap is formed between the corresponding inner wall surfaces of the lower chord edge shell 1 of the positive electrode plate 34 to form an air outlet channel 21. The negative electrode plate 31 and the positive electrode plate 34 have mutually overlapped areas in the radial height, the resistor plate group 33 is fixedly arranged in the overlapped area between the negative electrode plate 31 and the positive electrode plate 34, and the nozzle seat 2 is positioned right above the resistor plate group 33; an air inlet cavity 10 is formed in the shell 1 and positioned on the upper side of the top surface of the resistor plate group 33 and the front side of the positive plate 34, and the air inlet channel 11 is communicated with the air inlet cavity 10; an air outlet cavity 20 is formed in the shell 1 and positioned at the lower side of the bottom surface of the resistor plate group 33 and at the rear side of the negative plate 31, and the air outlet channel 21 is communicated with the air outlet cavity 20.
As shown in fig. 5 and 6, the resistive plate group 33 includes a plurality of vertical axial plates 331 with a space therebetween and a plurality of vertical radial plates 332 with a space therebetween, the plurality of axial plates 331 are arranged orthogonal to the plurality of radial plates 332, a plurality of vertical square air flow passages 333 are formed in the resistive plate group 33, and the plurality of air flow passages 333 communicate the air inlet chamber 10 with the air outlet chamber 20; four sides of the square airflow channel 333 are all resistance heating surfaces, and the four surfaces heat the flowing airflow, so that the heating area is large, the heating speed is high, the low-temperature airflow can be quickly and efficiently heated to high temperature, and the conversion efficiency of NO x is improved; meanwhile, the four sides of the airflow channel 333 are heated, urea drops drop on each surface, and are heated and volatilized quickly and fully to be pyrolyzed, so that urea crystallization caused by urea drop deposition is avoided, the risk of urea crystallization is low, and the effectiveness of the mixer is ensured.
In actual use, the negative electrode connector 32 and the positive electrode connector 35 which extend out of the electric heating assembly 3 are respectively connected to a vehicle-mounted power supply through circuits. When the engine is in a low-temperature working condition, the power supply of the electric heating assembly 3 is turned on, and the vehicle-mounted power supply is electrified to heat the electric heating assembly 3; the urea nozzle in the nozzle seat 2 sprays urea liquid drops into the air inlet cavity 10; the tail gas flow flows into the air inlet cavity 10 from the air inlet channel 11 to be mixed with urea drops to form mixed air flow, the mixed air flow flows through a plurality of air flow channels 333 of the electric heating component 3, the electric heating component 3 heats the mixed air flow, the urea drops fully absorb heat, volatilize and pyrolyze, then the mixed air flow enters the air outlet cavity 20, and flows out through the air outlet channel 21. When the engine is in a high-temperature working condition, the power supply of the electric heating assembly 3 is disconnected, and the failure of the supported catalyst caused by overhigh temperature is avoided.
According to the invention, under the low-temperature working condition, the low-temperature air flow is heated by the electric heating component 3, so that the low-temperature air flow can be quickly heated to high temperature, the conversion efficiency of NO x under the low-temperature working condition is improved, and the urea crystallization risk is reduced.
The above description is illustrative of the invention and is not intended to be limiting, and the invention may be modified in any form without departing from the spirit of the invention.
Claims (5)
1. An electrically heated urea mixer, characterized in that: an electric heating component (3) is arranged in the shell (1), an air inlet channel (11) and an air inlet cavity (10) which are communicated are arranged between the electric heating component (3) and the upper inner wall surface of the front part of the shell (1), and an air outlet channel (21) and an air outlet cavity (20) which are communicated are arranged between the electric heating component (3) and the lower inner wall surface of the rear part of the shell (1); the electric heating component (3) is provided with a plurality of air flow channels (333), and the air flow channels (333) are communicated with the air inlet cavity (10) and the air outlet cavity (20); the electric heating assembly (3) comprises a negative plate (31), a resistor plate group (33) and a positive plate (34), wherein a negative electrode joint (32) is arranged on the negative plate (31), and a positive electrode joint (35) is arranged on the positive plate (34); the resistance plate group (33) comprises a plurality of vertical arranged axial plates (331) with intervals and a plurality of vertical arranged radial plates (332) with intervals, and the plurality of axial plates (331) are arranged orthogonally to the plurality of radial plates (332); the negative plate (31) and the positive plate (34) are arranged in a major arc shape, the negative plate (31) and the positive plate (34) are provided with mutually overlapped areas in the radial height, and the resistance plate group (33) is arranged in the overlapped areas between the negative plate (31) and the positive plate (34); an air inlet cavity (10) is formed in the shell (1) and positioned above the top surface of the resistance plate group (33) and in front of the positive plate (34), and an air outlet cavity (20) is formed below the bottom surface of the resistance plate group (33) and behind the negative plate (31); the negative plate (31) covers the middle-lower radial section of the front part of the shell (1), the arc-shaped edge of the negative plate (31) is fixed on the middle-lower inner wall surface of the shell (1) through the first gasket (4), and an air inlet channel (11) is formed between the chord edge of the negative plate (31) and the corresponding inner wall surface of the shell (1); the positive plate (34) covers the radial section of the middle upper side of the rear part of the shell (1), the arc-shaped edge of the positive plate (34) is fixed on the inner wall of the middle upper side of the shell (1) through a second gasket (5), and an air outlet channel (21) is formed between the corresponding inner wall surfaces of the chord-edge shell (1) of the positive plate (34); a nozzle seat (2) is arranged on the shell (1) opposite to the electric heating component (3); a deflector (6) is arranged on the lower inner peripheral wall surface of the shell (1) and positioned at the rear of the electric heating component (3), and a plurality of through holes (61) are formed in the deflector (6).
2. An electrically heated urea mixer according to claim 1, characterized in that: the airflow channel (333) is a square channel.
3. An electrically heated urea mixer according to claim 2, characterized in that: the square channel is formed by a plurality of axial plates (331) arranged orthogonally to a plurality of radial plates (332).
4. An electrically heated urea mixer according to claim 1, characterized in that: the first gasket (4) is a major arc ceramic gasket, and the first gasket (4) is fixedly arranged on the inner wall surface of the middle lower side of the front part of the shell (1); the inner cambered surface of the first liner (4) is provided with a first groove (41) along the circumferential direction, and the middle part of the first liner (4) is provided with a first through mounting hole (42) along the radial direction; the arc-shaped edge of the negative plate (31) is inserted into the first groove (41), and the negative electrode joint (32) penetrates out of the first mounting hole (42) and the corresponding mounting hole on the shell (1).
5. An electrically heated urea mixer according to claim 1, characterized in that: the second gasket (5) is a major arc ceramic gasket, and the second gasket (5) is fixedly arranged on the inner wall surface of the middle upper side of the rear part of the shell (1); the inner cambered surface of the second liner (5) is provided with a second groove (51) along the circumferential direction, and the middle part of the second liner (5) is provided with a through second mounting hole (52) along the radial direction; the arc edge of the positive plate (34) is inserted into the second groove (51), and the positive electrode joint (35) penetrates out of the second mounting hole (52) and the corresponding mounting hole on the shell (1).
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| CN202110161885.3A CN112855314B (en) | 2021-02-05 | 2021-02-05 | Electric heating urea mixer |
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| CN202110161885.3A CN112855314B (en) | 2021-02-05 | 2021-02-05 | Electric heating urea mixer |
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| CN214403718U (en) * | 2021-02-05 | 2021-10-15 | 无锡亿利环保科技有限公司 | Electric heating urea mixer |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5582805A (en) * | 1992-12-21 | 1996-12-10 | Toyota Jidosha Kabushiki Kaisha | Electrically heated catalytic apparatus |
| DE202012011764U1 (en) * | 2012-12-07 | 2013-01-30 | Eberspächer Catem Gmbh & Co. Kg | Mixer for aftertreatment of exhaust gases |
| DE102014111310B4 (en) * | 2014-08-07 | 2021-05-06 | Denso Corporation | Exhaust mixer with integrated heating device |
| CN207686805U (en) * | 2017-12-23 | 2018-08-03 | 无锡威孚力达催化净化器有限责任公司 | A kind of electrical heating mixer and SCR system |
| JP7202252B2 (en) * | 2019-05-08 | 2023-01-11 | Ｈｋｔ株式会社 | mixing device |
| JP7345405B2 (en) * | 2019-05-30 | 2023-09-15 | 日本碍子株式会社 | Mixer for exhaust gas purification equipment, exhaust gas purification equipment, and exhaust gas purification method |
| CN110848005B (en) * | 2019-11-26 | 2020-10-20 | 无锡亿利环保科技有限公司 | Engine tail gas aftertreatment mixing arrangement |
| CN112031900A (en) * | 2020-08-21 | 2020-12-04 | 浙江邦得利环保科技股份有限公司 | Urea mixer |
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| CN214403718U (en) * | 2021-02-05 | 2021-10-15 | 无锡亿利环保科技有限公司 | Electric heating urea mixer |
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