CN112855314A - Electric heating urea mixer - Google Patents
Electric heating urea mixer Download PDFInfo
- Publication number
- CN112855314A CN112855314A CN202110161885.3A CN202110161885A CN112855314A CN 112855314 A CN112855314 A CN 112855314A CN 202110161885 A CN202110161885 A CN 202110161885A CN 112855314 A CN112855314 A CN 112855314A
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- China
- Prior art keywords
- shell
- electric heating
- plate
- gasket
- arc
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 239000004202 carbamide Substances 0.000 title claims abstract description 45
- 238000005485 electric heating Methods 0.000 title claims abstract description 41
- 239000000919 ceramic Substances 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 5
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 35
- 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 14
- 239000007788 liquid Substances 0.000 description 11
- 239000007789 gas Substances 0.000 description 8
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 3
- 239000003054 catalyst Substances 0.000 description 3
- 230000008021 deposition Effects 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910021529 ammonia Inorganic materials 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
- 238000005516 engineering process Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 239000000243 solution 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
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
- F01N3/28—Construction of catalytic reactors
- F01N3/2892—Exhaust flow directors or the like, e.g. upstream of catalytic device
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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
- F01N3/2006—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]
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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
- F01N3/2882—Catalytic reactors combined or associated with other devices, e.g. exhaust silencers or other exhaust purification devices
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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
- 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
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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
- 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
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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
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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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
- F01N2610/10—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
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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
- F01N2610/1486—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 type urea mixer.A shell is internally provided with an electric heating assembly, an air inlet channel and an air inlet cavity which are communicated are arranged between the electric heating assembly and the inner wall surface of the upper side of the front part of the shell, and an air outlet channel and an air outlet cavity which are communicated are arranged between the electric heating assembly and the inner wall surface of the lower side of the rear part of the shell; the electric heating component is provided with a plurality of airflow channels which are communicated with the air inlet cavity and the air outlet cavity. Under the low-temperature working condition, the low-temperature airflow is heated by the electric heating assembly, so that the low-temperature airflow can be quickly heated to high temperature, and NO (nitric oxide) under the low-temperature working condition is improvedxThe conversion efficiency of (2) and the risk of urea crystallization is reduced.
Description
Technical Field
The invention relates to the technical field of engine tail gas aftertreatment, in particular to an electric heating type urea mixer.
Background
In an engine exhaust aftertreatment system, the exhaust emission of an engine is generally subjected to aftertreatment by using a Selective Catalytic Reduction (SCR) technology; in order to ensure that urea liquid drops can be fully and uniformly mixed with the tail gas of the diesel engine in the aftertreatment system, a mixer is added in the aftertreatment system, urea aqueous solution is sprayed into the mixer, and the urea aqueous solution is heated by the tail gas and decomposed into ammonia (NH)3) Ammonia gas (NH) under the action of catalyst3) Removing Nitrogen Oxides (NO) from exhaust gasesX) Reduction to harmless nitrogen (N)2) And water (H)2O), and finally discharged from the tail gas pipe, thereby achieving the purpose of reducing the emission.
Along with the implementation of the national six-emission regulation, the emission of tail gas is increased, and NO is increased under the working conditions of low-temperature cold start and low-temperature low loadxRow of (2)The limit value is required, and the activity of the SCR carrier catalyst is poor under the low-temperature working condition, so that NO is generatedxConversion efficiency is relatively poor, and simultaneously, under low temperature operating mode, the difficult evaporation of urea liquid drop, and produce the urea crystallization in the blender, the serious person still can make the blender jam to lead to the blender inefficacy.
Disclosure of Invention
The applicant aims at the NO of the aftertreatment urea mixer under low-temperature working conditionsxPoor conversion efficiency, easy generation of urea crystals and the like, and provides an electric heating type urea mixer with reasonable structure, which can improve NO under the low-temperature working conditionxConversion efficiency, and urea crystallization is avoided.
The technical scheme adopted by the invention is as follows:
an electric heating type urea mixer is characterized in that an electric heating assembly is arranged in a shell, an air inlet channel and an air inlet cavity which are communicated are arranged between the electric heating assembly and the inner wall surface of the upper side of the front part of the shell, and an air outlet channel and an air outlet cavity which are communicated are arranged between the electric heating assembly and the inner wall surface of the lower side of the rear part of the shell; the electric heating component is provided with a plurality of airflow channels which are communicated with the air inlet cavity and the air outlet cavity.
Under the low-temperature working condition, the low-temperature airflow is heated by the electric heating assembly, so that the low-temperature airflow can be quickly heated to high temperature, and NO (nitric oxide) under the low-temperature working condition is improvedxThe conversion efficiency of (2) and the risk of urea crystallization is reduced.
As a further improvement of the above technical solution:
the airflow channel is a square channel.
The square channel is formed by a plurality of axial plates and a plurality of radial plates in a crossed arrangement.
The four surfaces of the square airflow channel are all resistance heating surfaces, the four surfaces heat flowing airflow, the heating area is large, the heating speed is high, low-temperature airflow can be quickly and efficiently heated to high temperature, and NO is increasedxThe conversion efficiency of (a); meanwhile, the four sides of the airflow channel have heating function, urea liquid drops drop on each side, are quickly and fully heated and volatilized and pyrolyzed, and urea liquid drop deposition is avoidedAnd urea crystallization is generated, so that 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 connector is arranged on the negative plate, and a positive electrode connector is arranged on the positive plate; the resistor plate group comprises a plurality of axial plates which are vertically arranged and have intervals and a plurality of radial plates which are vertically arranged and have intervals, and the plurality of axial plates and the plurality of radial plates are orthogonally arranged.
The negative plate and the positive plate are excellent arc-shaped panels which are oppositely arranged, the negative plate and the positive plate are provided with mutually overlapped areas in the radial height, and the resistance plate group is arranged in the overlapped area between the negative plate and the positive plate; in the shell, be located resistance board group top surface upside and positive plate front side and form the air inlet chamber, be located resistance board group bottom surface downside and negative plate rear side and form the air outlet chamber.
The negative plate covers the radial section of the middle lower side of the front part of the shell, the arc-shaped edge of the negative plate is fixed on the inner wall surface of the middle lower side of the shell through the 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 liner is a ceramic gasket in a U-arc shape and is fixedly arranged on the inner wall surface of the middle lower side of the front part of the shell; the inner arc surface of the first liner is circumferentially provided with a first groove, and the middle part of the first liner is radially provided with a through first mounting hole; the arc edge of negative plate cartridge is to first recess in, and the negative pole connects corresponding mounting hole on following first mounting hole and shell and wears out.
The positive plate covers the radial section of the middle upper side of the rear part of the shell, the arc edge of the positive plate is fixed on the inner wall of the middle upper side of the shell through the second gasket, and an air outlet channel is formed between the corresponding inner wall surfaces of the chord edge shell of the positive plate.
The second gasket is a ceramic gasket in a U-arc shape and is fixedly arranged on the inner wall surface of the middle upper side of the rear part of the shell; a second groove is formed in the inner arc surface of the second liner along the circumferential direction, and a through second mounting hole is formed in the middle of the second liner along the radial direction; the arc edge of the positive plate is inserted into the second groove, and the positive connector penetrates out of the second mounting hole and the corresponding mounting hole in the shell.
The shell is provided with a nozzle seat opposite to the electric heating assembly; a guide plate is arranged on the inner peripheral wall surface of the lower side of the shell and behind the electric heating assembly, and a plurality of through holes are formed in the guide plate.
The invention has the following beneficial effects:
under the low-temperature working condition, the low-temperature airflow is heated by the electric heating assembly, so that the low-temperature airflow can be quickly heated to high temperature, and NO (nitric oxide) under the low-temperature working condition is improvedxThe conversion efficiency of (2) and the risk of urea crystallization is reduced.
The four surfaces of the square airflow channel are all resistance heating surfaces, the four surfaces heat flowing airflow, the heating area is large, the heating speed is high, low-temperature airflow can be quickly and efficiently heated to high temperature, and NO is increasedxThe conversion efficiency of (a); meanwhile, the four sides of the airflow channel have heating functions, urea liquid drops are dripped on the surfaces, are quickly and fully heated and volatilized, and are pyrolyzed, urea crystallization caused by urea liquid drop deposition is avoided, the urea crystallization risk 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 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 terminal; 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 tab; 4. a first liner; 41. a first groove; 42. a first mounting hole; 5. a second liner; 51. a second groove; 52. a second mounting hole; 6. a baffle; 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 embodiments of the present invention with reference to the drawings.
As shown in fig. 1 and 4, a nozzle holder 2 is provided on the upper outer circumferential wall surface of a cylindrical casing 1 of the present invention, and the nozzle holder 2 is connected to a urea nozzle (not shown). An electric heating assembly 3 is arranged in the shell 1 and opposite to the nozzle seat 2, and the front side and the rear side of the electric heating assembly 3 are respectively fixed on the inner wall surface of the shell 1 through a first gasket 4 and a second gasket 5; on the lower side of shell 1, the inner peripheral wall face, the rear that is located electric heating element 3 is provided with guide plate 6, offers a plurality of through-holes 61 on the guide plate 6, and guide plate 6 can play the effect of blockking to the air current that flows for the air current diversion upwards flows to the slant, prevents that the local air current velocity of downside is too big, improves the homogeneity of the air current velocity.
As shown in fig. 1, 2 and 3, the first gasket 4 and the second gasket 5 are arc ceramic gaskets, which are used as insulators and arranged between the outer shell 1 and the electric heating assembly 3 to electrically isolate the outer shell 1 from the electric heating assembly 3; the contour dimension of the outer peripheral surfaces of the first gasket 4 and the second gasket 5 is matched with the contour dimension of the inner peripheral surface of the shell 1, 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, 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. A first groove 41 is formed in the inner arc surface of the first gasket 4 along the circumferential direction, and a first through mounting hole 42 is formed in the middle of the first gasket 4 along the radial direction; the inner arc 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 mounting hole 52 which is through along the radial direction.
As shown in fig. 1 and 5, the electric heating assembly 3 is provided with a negative electrode plate 31, a resistor plate group 33, and a positive electrode plate 34 in this order from front to back; the negative plate 31 and the positive plate 34 are oppositely arranged major arc panels, a negative electrode connector 32 extends out of the top of the arc edge of the negative plate 31, and a positive electrode connector 35 extends out of the top of the arc edge of the positive plate 34. As shown in fig. 4, the arc edge of the negative plate 31 is located at the lower side, the contour dimension of the arc edge is matched with the contour dimension of the first groove 41 of the first gasket 4, the arc edge of the negative plate 31 is inserted into the first groove 41, and the negative tab 32 penetrates through the first mounting hole 42 of the first gasket 4 and the corresponding mounting hole on the shell 1; the negative plate 31 covers the radial section of the middle lower side of the front part of the shell 1, and a gap is arranged 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 at 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 connector 35 penetrates out of the second mounting hole 52 of the second gasket 5 and the corresponding mounting hole on the shell 1; the positive plates 34 cover the mid-upper radial cross section of the rear portion of the housing 1, and the lower chordal housing 1 of the positive plates 34 has a gap between corresponding inner wall surfaces forming the gas outlet passage 21. The negative electrode plate 31 and the positive electrode plate 34 have a region in which they overlap each other in radial height, the resistance plate group 33 is fixedly provided in the overlapping region between the negative electrode plate 31 and the positive electrode plate 34, and the nozzle holder 2 is positioned directly above the resistance 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 group 33 and on the front side of the positive plate 34, and an air inlet channel 11 is communicated with the air inlet cavity 10; an air outlet cavity 20 is formed in the shell 1 and is positioned on the lower side of the bottom surface of the resistor plate group 33 and on 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 resistor plate group 33 includes a plurality of vertically arranged axial plates 331 with a spacing, and a plurality of vertically arranged radial plates 332 with a spacing, the plurality of axial plates 331 and the plurality of radial plates 332 are orthogonally arranged, a plurality of vertical square airflow channels 333 are formed on the resistor plate group 33, and the plurality of airflow channels 333 communicate the inlet cavity 10 and the outlet cavity 20; the four surfaces of the square airflow channel 333 are resistance heating surfaces, the four surfaces heat flowing airflow, the heating area is large, the heating speed is high, low-temperature airflow can be quickly and efficiently heated to high temperature, and NO is increasedxThe conversion efficiency of (a); meanwhile, four sides of the airflow channel 333 have a heating function, urea liquid drops drop on each side, are quickly and fully heated and volatilized and pyrolyzed, urea crystallization caused by urea liquid drop deposition is avoided, the risk of urea crystallization is low, and the effectiveness of the mixer is guaranteed.
In practical use of the present invention, the negative electrode connector 32 and the positive electrode connector 35 extending from the electric heating assembly 3 are respectively connected to the vehicle-mounted power supply through wires. 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; a urea nozzle in the nozzle seat 2 sprays urea liquid drops into the air inlet cavity 10; the tail gas air flow flows into the air inlet cavity 10 from the air inlet channel 11 to be mixed with the urea liquid drops to form mixed air flow, the mixed air flow flows through the air flow channels 333 of the electric heating assembly 3, the electric heating assembly 3 heats the mixed air flow, so that the urea liquid drops fully absorb heat, volatilize and pyrolyze, then enter the air outlet cavity 20, and flow 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 cut off, and the catalyst of the carrier is prevented from losing efficacy due to overhigh temperature.
Under the low-temperature working condition, the low-temperature airflow is heated by the electric heating assembly 3, so that the low-temperature airflow can be quickly heated to high temperature, and NO (nitric oxide) under the low-temperature working condition is improvedxThe conversion efficiency of (2) and the risk of urea crystallization is reduced.
The foregoing description is illustrative of the present invention and is not to be construed as limiting thereof, as the invention may be modified in any manner without departing from the spirit thereof.
Claims (10)
1. An electric heating type 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 inner wall surface of the upper side 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 inner wall surface of the lower side 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 inlet cavity (10) and the air outlet cavity (20) are communicated by the air flow channels (333).
2. An electrically heated urea mixer according to claim 1, characterized in that: the air flow 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) and a plurality of radial plates (332) which are arranged orthogonally.
4. An electrically heated urea mixer according to claim 1, characterized in that: the electric heating assembly (3) comprises a negative plate (31), a resistance 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 resistor plate group (33) comprises a plurality of vertical axial plates (331) with intervals and a plurality of vertical radial plates (332) with intervals, wherein the plurality of axial plates (331) and the plurality of radial plates (332) are orthogonally arranged.
5. An electrically heated urea mixer according to claim 4, characterized in that: the negative plate (31) and the positive plate (34) are excellent arc-shaped panels which are oppositely arranged, the negative plate (31) and the positive plate (34) have an area which is overlapped with each other in the radial height, and the resistance plate group (33) is arranged in the overlapping area between the negative plate (31) and the positive plate (34); in the shell (1), an air inlet cavity (10) is formed on the upper side of the top surface of the resistor group (33) and on the front side of the positive plate (34), and an air outlet cavity (20) is formed on the lower side of the bottom surface of the resistor group (33) and on the rear side of the negative plate (31).
6. An electrically heated urea mixer according to claim 4, characterized in that: the negative plate (31) covers the radial section of the middle lower side of the front part of the shell (1), the arc-shaped edge of the negative plate (31) is fixed on the inner wall surface of the middle lower side of the shell (1) through the first liner (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).
7. An electrically heated urea mixer according to claim 6, characterized in that: the first gasket (4) is a ceramic gasket in a U-arc shape, 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); a first groove (41) is formed in the inner arc surface of the first gasket (4) along the circumferential direction, and a first through mounting hole (42) is formed in the middle of the first gasket (4) along the radial direction; the arc 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).
8. An electrically heated urea mixer according to claim 4, characterized in that: the positive plate (34) covers the middle-upper radial section of the rear part of the shell (1), the arc-shaped edge of the positive plate (34) is fixed on the middle-upper inner wall of the shell (1) through the 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).
9. An electrically heated urea mixer according to claim 8, characterized in that: the second gasket (5) is a ceramic gasket in an arc shape, and the second gasket (5) is fixedly arranged on the inner wall surface of the middle upper side at the rear part of the shell (1); a second groove (51) is formed in the inner arc surface of the second gasket (5) along the circumferential direction, and a through second mounting hole (52) is formed in the middle of the second gasket (5) along the radial direction; the arc edge of the positive plate (34) is inserted into the second groove (51), and the positive connector (35) penetrates out of the second mounting hole (52) and the corresponding mounting hole in the shell (1).
10. An electrically heated urea mixer according to claim 1, characterized in that: the shell (1) is provided with a nozzle seat (2) opposite to the electric heating component (3); a guide plate (6) is arranged on the lower inner peripheral wall surface of the shell (1) and behind the electric heating assembly (3), and a plurality of through holes (61) are formed in the guide plate (6).
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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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| CN112855314B CN112855314B (en) | 2024-06-25 |
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2021
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| CN112855314B (en) | 2024-06-25 |
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